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(Aug  8 01:04 2009  README  Page 1) 144.161 Tj
0 -28.4801 Td
(xv6 is a re-implementation of Dennis Ritchie's and Ken Thompson\
's Unix) 305.796 Tj
0 -37.9735 Td
(Version 6 \(v6\).  xv6 loosely follows the structure and style \
of v6,) 292.6905 Tj
0 -47.4668 Td
(but is implemented for a modern x86-based multiprocessor using \
ANSI C.) 305.796 Tj
0 -66.4535 Td
(ACKNOWLEDGMENTS) 65.5277 Tj
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(xv6 is inspired by John Lions's Commentary on UNIX 6th Edition \
\(Peer) 297.059 Tj
0 -94.9336 Td
(to Peer Communications; ISBN: 1-57398-013-7; 1st edition \(June\
 14,) 288.322 Tj
0 -104.4269 Td
(2000\)\). See also http://pdos.csail.mit.edu/6.828/2007/v6.html\
, which) 297.059 Tj
0 -113.9203 Td
(provides pointers to on-line resources for v6.) 200.9517 Tj
0 -132.907 Td
(xv6 borrows code from the following sources:) 192.2146 Tj
17.4613 -142.4004 Td
(JOS \(asm.h, elf.h, mmu.h, bootasm.S, ide.c, console.c, and oth\
ers\)) 288.322 Tj
17.4613 -151.8937 Td
(Plan 9 \(bootother.S, mp.h, mp.c, lapic.c\)) 179.1091 Tj
17.4613 -161.3871 Td
(FreeBSD \(ioapic.c\)) 78.6333 Tj
17.4613 -170.8804 Td
(NetBSD \(console.c\)) 78.6333 Tj
0 -189.8667 Td
(The following people made contributions:) 174.7406 Tj
17.4613 -199.3601 Td
(Russ Cox \(context switching, locking\)) 161.635 Tj
17.4613 -208.8535 Td
(Cliff Frey \(MP\)) 65.5277 Tj
17.4613 -218.3468 Td
(Xiao Yu \(MP\)) 52.4222 Tj
0 -237.3335 Td
(The code in the files that constitute xv6 is) 192.2146 Tj
0 -246.8269 Td
(Copyright 2006-2007 Frans Kaashoek, Robert Morris, and Russ Cox\
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(ERROR REPORTS) 56.7907 Tj
0 -284.8003 Td
(If you spot errors or have suggestions for improvement, please \
send) 292.6905 Tj
0 -294.2936 Td
(email to Frans Kaashoek and Robert Morris \(kaashoek,rtm@csail.\
mit.edu\). ) 314.533 Tj
0 -313.2803 Td
(BUILDING AND RUNNING XV6) 104.8443 Tj
0 -332.267 Td
(To build xv6 on an x86 ELF machine \(like Linux or FreeBSD\), r\
un "make".) 310.1645 Tj
0 -341.7604 Td
(On non-x86 or non-ELF machines \(like OS X, even on x86\), you \
will) 283.9534 Tj
0 -351.2538 Td
(need to install a cross-compiler gcc suite capable of producing\
 x86 ELF) 310.1645 Tj
0 -360.7471 Td
(binaries.  See http://pdos.csail.mit.edu/6.828/2007/tools.html.) 275.2164 Tj
0 -370.2405 Td
(Then run "make TOOLPREFIX=i386-jos-elf-".) 179.1091 Tj
0 -389.2272 Td
(To run xv6, you can use Bochs or QEMU, both PC simulators.) 253.3738 Tj
0 -398.7205 Td
(Bochs makes debugging easier, but QEMU is much faster. ) 240.2683 Tj
0 -408.2139 Td
(To run in Bochs, run "make bochs" and then type "c" at the boch\
s prompt.) 314.533 Tj
0 -417.7073 Td
(To run in QEMU, run "make qemu".  Both log the xv6 screen outpu\
t to ) 297.059 Tj
0 -427.2006 Td
(standard output.) 69.8962 Tj
0 -446.1873 Td
(To create a typeset version of the code, run "make xv6.pdf".) 262.1109 Tj
0 -455.6807 Td
(This requires the "mpage" text formatting utility.) 218.4257 Tj
0 -465.174 Td
(See http://www.mesa.nl/pub/mpage/.) 148.5295 Tj
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(Aug  8 01:04 2009  table of contents  Page 1) 192.2146 Tj
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(The numbers to the left of the file names in the table are shee\
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(35 bio.c) 34.9481 Tj
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(67 initcode.S) 56.7907 Tj
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(36 fs.c) 30.5796 Tj
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(The source listing is preceded by a cross-reference that lists \
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(constant, struct, global variable, and function in xv6.  Each e\
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(on the same line as the name, the line number \(or, in a few ca\
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(where the name is defined.  Successive lines in an entry list t\
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(numbers where the name is used.  For example, this entry:) 249.0053 Tj
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(swtch 2256) 43.6851 Tj
34.9226 -398.7208 Td
(0311 1928 1962 2255) 83.0018 Tj
34.9226 -408.2141 Td
(2256) 17.4741 Tj
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(indicates that swtch is defined on line 2256 and is mentioned o\
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-0 -436.6942 Td
(on sheets 03, 19, and 22.) 109.2129 Tj
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0 -104.4266 Td
(havedisk1 3327) 61.1592 Tj
-13042 TJm
(0237 1881 3888 4361) 83.0018 Tj
17.4613 -113.9199 Td
(3327 3364 3462) 61.1592 Tj
-9028.94 TJm
(iget 3853) 39.3166 Tj
0 -123.4133 Td
(holding 1444) 52.4222 Tj
-14045.3 TJm
(3794 3818 3853 3873) 83.0018 Tj
17.4613 -132.9067 Td
(0323 1376 1404 1444) 83.0018 Tj
-8527.14 TJm
(4234 4359) 39.3166 Tj
17.4613 -142.4 Td
(1957) 17.4741 Tj
-14045.6 TJm
(iinit 3789) 43.6851 Tj
0 -151.8934 Td
(ialloc 3802) 48.0537 Tj
-14547 TJm
(0238 1231 3789) 61.1592 Tj
17.4613 -161.3867 Td
(0236 3802 3822 4820) 83.0018 Tj
-6520.6 TJm
(ilock 3902) 43.6851 Tj
17.4613 -170.8801 Td
(4821) 17.4741 Tj
-16052.1 TJm
(0239 3902 3908 3928) 83.0018 Tj
0 -180.3735 Td
(IBLOCK 3185) 48.0537 Tj
-14547 TJm
(4364 4479 4511 4531) 83.0018 Tj
17.4613 -189.8664 Td
(3185 3811 3832 3917) 83.0018 Tj
-8527.14 TJm
(4672 4683 4693 4762) 83.0018 Tj
0 -199.3598 Td
(I_BUSY 3277) 48.0537 Tj
-14547 TJm
(4774 4809 4813 4823) 83.0018 Tj
17.4613 -208.8532 Td
(3277 3911 3913 3936) 83.0018 Tj
-8527.14 TJm
(4867 4937 5023 6563) 83.0018 Tj
17.4613 -218.3465 Td
(3940 3957 3959) 61.1592 Tj
-11035.5 TJm
(6583 6610) 39.3166 Tj
0 -227.8399 Td
(ICRHI 5674) 43.6851 Tj
-13042.1 TJm
(inb 0403) 34.9481 Tj
17.4613 -237.3332 Td
(5674 5737 5821 5833) 83.0018 Tj
-8527.14 TJm
(0403 0928 0936 1154) 83.0018 Tj
0 -246.8266 Td
(ICRLO 5667) 43.6851 Tj
-15048.7 TJm
(3336 3363 5646 6264) 83.0018 Tj
17.4613 -256.32 Td
(5667 5738 5739 5822) 83.0018 Tj
-8527.14 TJm
(6267 6461 6463) 61.1592 Tj
17.4613 -265.8133 Td
(5824 5834) 39.3166 Tj
-11537.3 TJm
(initlock 1361) 56.7907 Tj
0 -275.3067 Td
(ID 5660) 30.5796 Tj
174.613 -275.3067 Td
(0324 1361 1622 2283) 83.0018 Tj
17.461 -284.8 Td
(5660 5693 5766) 61.1592 Tj
-11035.5 TJm
(2574 3355 3543 3791) 83.0018 Tj
-0.0003 -294.2934 Td
(IDE_BSY 3312) 52.4222 Tj
-14045.3 TJm
(4415 5184 6618 6619) 83.0018 Tj
17.461 -303.7868 Td
(3312 3336) 39.3166 Tj
-11537.3 TJm
(inode 3263) 43.6851 Tj
-0.0003 -313.2801 Td
(IDE_CMD_READ 3317) 74.2647 Tj
-11537 TJm
(0203 0234 0235 0236) 83.0018 Tj
17.461 -322.7735 Td
(3317 3391) 39.3166 Tj
-13543.8 TJm
(0237 0239 0240 0241) 83.0018 Tj
-0.0003 -332.2664 Td
(IDE_CMD_WRITE 3318) 78.6333 Tj
-11035.3 TJm
(0242 0243 0245 0246) 83.0018 Tj
17.461 -341.7598 Td
(3318 3388) 39.3166 Tj
-13543.8 TJm
(0247 0248 0249 1541) 83.0018 Tj
-0.0003 -351.2532 Td
(IDE_DF 3314) 48.0537 Tj
-14547 TJm
(3256 3263 3284 3285) 83.0018 Tj
17.461 -360.7465 Td
(3314 3338) 39.3166 Tj
-13543.8 TJm
(3674 3785 3794 3801) 83.0018 Tj
-0.0003 -370.2399 Td
(IDE_DRDY 3313) 56.7907 Tj
-13543.7 TJm
(3827 3852 3855 3861) 83.0018 Tj
17.461 -379.7332 Td
(3313 3336) 39.3166 Tj
-13543.8 TJm
(3887 3888 3902 3934) 83.0018 Tj
-0.0003 -389.2266 Td
(IDE_ERR 3315) 52.4222 Tj
-14045.3 TJm
(3952 3974 4010 4054) 83.0018 Tj
17.461 -398.72 Td
(3315 3338) 39.3166 Tj
-13543.8 TJm
(4085 4102 4152 4211) 83.0018 Tj
-0.0003 -408.2133 Td
(ideinit 3351) 52.4222 Tj
-14045.3 TJm
(4212 4252 4256 4353) 83.0018 Tj
17.461 -417.7067 Td
(0251 1232 3351) 61.1592 Tj
-11035.5 TJm
(4356 4388 4395 4666) 83.0018 Tj
-0.0003 -427.2 Td
(ideintr 3402) 52.4222 Tj
-14045.3 TJm
(4702 4753 4800 4804) 83.0018 Tj
17.461 -436.6934 Td
(0252 2624 3402) 61.1592 Tj
-11035.5 TJm
(4856 4904 4915 4933) 83.0018 Tj
-0.0003 -446.1868 Td
(idelock 3324) 52.4222 Tj
-14045.3 TJm
(5015 6551 6601) 61.1592 Tj
17.461 -455.6801 Td
(3324 3355 3407 3409) 83.0018 Tj
-6520.6 TJm
(INPUT_BUF 6500) 61.1592 Tj
17.461 -465.1735 Td
(3428 3465 3480 3482) 83.0018 Tj
-8527.14 TJm
(6500 6503 6524 6536) 83.0018 Tj
-0.0003 -474.6665 Td
(iderw 3454) 43.6851 Tj
-15048.7 TJm
(6537 6539 6568) 61.1592 Tj
17.461 -484.1598 Td
(0253 3454 3459 3461) 83.0018 Tj
-6520.6 TJm
(insl 0412) 39.3166 Tj
17.461 -493.6532 Td
(3608 3619) 39.3166 Tj
-13543.8 TJm
(0412 0414 1173 3417) 83.0018 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 4 4
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  cross-references  Page 5) 187.8461 Tj
0 -28.4801 Td
(INT_DISABLED 5869) 74.2647 Tj
-11537 TJm
(2436 2636 5707) 61.1592 Tj
17.4613 -37.9735 Td
(5869 5917) 39.3166 Tj
-11537.3 TJm
(IRQ_TIMER 2431) 61.1592 Tj
0 -47.4664 Td
(ioapic 5877) 48.0537 Tj
-14547 TJm
(2431 2614 2663 5714) 83.0018 Tj
17.4613 -56.9598 Td
(5607 5627 5628 5874) 83.0018 Tj
-8527.14 TJm
(6680) 17.4741 Tj
17.4613 -66.4531 Td
(5877 5886 5887 5893) 83.0018 Tj
-6520.6 TJm
(isdirempty 4702) 65.5277 Tj
17.4613 -75.9465 Td
(5894 5908) 39.3166 Tj
-13543.8 TJm
(4702 4709 4778) 61.1592 Tj
0 -85.4399 Td
(IOAPIC 5858) 48.0537 Tj
-12540.5 TJm
(ismp 5514) 39.3166 Tj
17.4613 -94.9332 Td
(5858 5908) 39.3166 Tj
-13543.8 TJm
(0277 1233 5514 5613) 83.0018 Tj
0 -104.4266 Td
(ioapicenable 5923) 74.2647 Tj
-11537 TJm
(5905 5925) 39.3166 Tj
17.4613 -113.9199 Td
(0256 3357 5923 6626) 83.0018 Tj
-6520.6 TJm
(itrunc 4054) 48.0537 Tj
0 -123.4133 Td
(ioapicid 5516) 56.7907 Tj
-13543.7 TJm
(3674 3961 4054) 61.1592 Tj
17.4613 -132.9067 Td
(0257 5516 5628 5911) 83.0018 Tj
-6520.6 TJm
(iunlock 3934) 52.4222 Tj
17.4613 -142.4 Td
(5912) 17.4741 Tj
-16052.1 TJm
(0241 3934 3937 3976) 83.0018 Tj
0 -151.8934 Td
(ioapicinit 5901) 65.5277 Tj
-12540.3 TJm
(4371 4481 4514 4534) 83.0018 Tj
17.4613 -161.3867 Td
(0258 1221 5901 5912) 83.0018 Tj
-8527.14 TJm
(4679 4880 4942 6556) 83.0018 Tj
0 -170.8801 Td
(ioapicread 5884) 65.5277 Tj
-12540.3 TJm
(6605) 17.4741 Tj
17.4613 -180.3735 Td
(5884 5909 5910) 61.1592 Tj
-9028.94 TJm
(iunlockput 3974) 65.5277 Tj
0 -189.8664 Td
(ioapicwrite 5891) 69.8962 Tj
-12038.7 TJm
(0242 3974 4366 4375) 83.0018 Tj
17.4613 -199.3598 Td
(5891 5917 5918 5931) 83.0018 Tj
-8527.14 TJm
(4378 4674 4685 4688) 83.0018 Tj
17.4613 -208.8532 Td
(5932) 17.4741 Tj
-16052.1 TJm
(4696 4766 4771 4779) 83.0018 Tj
0 -218.3465 Td
(IO_PIC1 5957) 52.4222 Tj
-14045.3 TJm
(4780 4791 4795 4812) 83.0018 Tj
17.4613 -227.8399 Td
(5957 5970 5985 5994) 83.0018 Tj
-8527.14 TJm
(4816 4840 4869 4877) 83.0018 Tj
17.4613 -237.3332 Td
(5997 6002 6012 6026) 83.0018 Tj
-8527.14 TJm
(4908 4925 4939 5077) 83.0018 Tj
17.4613 -246.8266 Td
(6027) 17.4741 Tj
-16052.1 TJm
(5118) 17.4741 Tj
0 -256.32 Td
(IO_PIC2 5958) 52.4222 Tj
-12038.8 TJm
(iupdate 3827) 52.4222 Tj
17.4613 -265.8133 Td
(5958 5971 5986 6015) 83.0018 Tj
-8527.14 TJm
(0243 3827 3963 4080) 83.0018 Tj
17.4613 -275.3067 Td
(6016 6017 6020 6029) 83.0018 Tj
-8527.14 TJm
(4178 4678 4695 4789) 83.0018 Tj
17.4613 -284.8 Td
(6030) 17.4741 Tj
-16052.1 TJm
(4794 4827 4831) 61.1592 Tj
0 -294.2934 Td
(IO_RTC 5800) 48.0537 Tj
-12540.5 TJm
(I_VALID 3278) 52.4222 Tj
17.4613 -303.7868 Td
(5800 5813 5814) 61.1592 Tj
-11035.5 TJm
(3278 3916 3926 3955) 83.0018 Tj
0 -313.2801 Td
(IO_TIMER1 6659) 61.1592 Tj
-11035.5 TJm
(kalloc 2354) 48.0537 Tj
17.4613 -322.7735 Td
(6659 6668 6678 6679) 83.0018 Tj
-8527.14 TJm
(0261 1283 1772 1812) 83.0018 Tj
0 -332.2664 Td
(IPB 3182) 34.9481 Tj
-16052 TJm
(1838 1865 2354 2360) 83.0018 Tj
17.4613 -341.7598 Td
(3182 3185 3191 3812) 83.0018 Tj
-8527.14 TJm
(2375 5058 5178) 61.1592 Tj
17.4613 -351.2532 Td
(3833 3918) 39.3166 Tj
-11537.3 TJm
(KBDATAP 6104) 52.4222 Tj
0 -360.7465 Td
(iput 3952) 39.3166 Tj
-15550.3 TJm
(6104 6267) 39.3166 Tj
17.4613 -370.2399 Td
(0240 2120 3952 3958) 83.0018 Tj
-6520.6 TJm
(kbdgetc 6256) 52.4222 Tj
17.4613 -379.7332 Td
(3977 4260 4382 4471) 83.0018 Tj
-8527.14 TJm
(6256 6298) 39.3166 Tj
17.4613 -389.2266 Td
(4689 4943) 39.3166 Tj
-11537.3 TJm
(kbdintr 6296) 52.4222 Tj
0 -398.72 Td
(IRQ_COM1 2433) 56.7907 Tj
-13543.7 TJm
(0266 2628 6296) 61.1592 Tj
17.4613 -408.2133 Td
(2433 2631) 39.3166 Tj
-11537.3 TJm
(KBS_DIB 6103) 52.4222 Tj
0 -417.7067 Td
(IRQ_ERROR 2435) 61.1592 Tj
-13042 TJm
(6103 6265) 39.3166 Tj
17.4613 -427.2 Td
(2435 5727) 39.3166 Tj
-11537.3 TJm
(KBSTATP 6102) 52.4222 Tj
0 -436.6934 Td
(IRQ_IDE 2434) 52.4222 Tj
-14045.3 TJm
(6102 6264) 39.3166 Tj
17.4613 -446.1868 Td
(2434 2623 3356 3357) 83.0018 Tj
-6520.6 TJm
(KEY_DEL 6128) 52.4222 Tj
0 -455.6801 Td
(IRQ_KBD 2432) 52.4222 Tj
-14045.3 TJm
(6128 6169 6191 6215) 83.0018 Tj
17.4613 -465.1735 Td
(2432 2627 6625 6626) 83.0018 Tj
-6520.6 TJm
(KEY_DN 6122) 48.0537 Tj
0 -474.6665 Td
(IRQ_SLAVE 5960) 61.1592 Tj
-13042 TJm
(6122 6165 6187 6211) 83.0018 Tj
17.4613 -484.1598 Td
(5960 5964 6002 6017) 83.0018 Tj
-6520.6 TJm
(KEY_END 6120) 52.4222 Tj
0 -493.6532 Td
(IRQ_SPURIOUS 2436) 74.2647 Tj
-11537 TJm
(6120 6168 6190 6214) 83.0018 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  cross-references  Page 6) 187.8461 Tj
0 -28.4801 Td
(KEY_HOME 6119) 56.7907 Tj
-13543.7 TJm
(5680 5719) 39.3166 Tj
17.4613 -37.9735 Td
(6119 6168 6190 6214) 83.0018 Tj
-6520.6 TJm
(LIST 6860) 39.3166 Tj
0 -47.4664 Td
(KEY_INS 6127) 52.4222 Tj
-14045.3 TJm
(6860 6940 7107 7383) 83.0018 Tj
17.4613 -56.9598 Td
(6127 6169 6191 6215) 83.0018 Tj
-6520.6 TJm
(listcmd 6890 7101) 74.2647 Tj
0 -66.4531 Td
(KEY_LF 6123) 48.0537 Tj
-14547 TJm
(6890 6911 6941 7101) 83.0018 Tj
17.4613 -75.9465 Td
(6123 6167 6189 6213) 83.0018 Tj
-8527.14 TJm
(7103 7246 7357 7384) 83.0018 Tj
0 -85.4399 Td
(KEY_PGDN 6126) 56.7907 Tj
-11537.1 TJm
(loadfsgs 0514) 56.7907 Tj
17.4613 -94.9332 Td
(6126 6166 6188 6212) 83.0018 Tj
-8527.14 TJm
(0514 1712) 39.3166 Tj
0 -104.4266 Td
(KEY_PGUP 6125) 56.7907 Tj
-11537.1 TJm
(ltr 0479) 34.9481 Tj
17.4613 -113.9199 Td
(6125 6166 6188 6212) 83.0018 Tj
-8527.14 TJm
(0479 0481 1731) 61.1592 Tj
0 -123.4133 Td
(KEY_RT 6124) 48.0537 Tj
-12540.5 TJm
(MAXARGS 6863) 52.4222 Tj
17.4613 -132.9067 Td
(6124 6167 6189 6213) 83.0018 Tj
-8527.14 TJm
(6863 6871 6872 7340) 83.0018 Tj
0 -142.4 Td
(KEY_UP 6121) 48.0537 Tj
-12540.5 TJm
(MAXFILE 3169) 52.4222 Tj
17.4613 -151.8934 Td
(6121 6165 6187 6211) 83.0018 Tj
-8527.14 TJm
(3169 4165 4166) 61.1592 Tj
0 -161.3867 Td
(kfree 2305) 43.6851 Tj
-13042.1 TJm
(memcmp 5311) 48.0537 Tj
17.4613 -170.8801 Td
(0262 1843 1866 2169) 83.0018 Tj
-8527.14 TJm
(0330 5311 5543 5588) 83.0018 Tj
17.4613 -180.3735 Td
(2170 2287 2305 2310) 83.0018 Tj
-6520.6 TJm
(memmove 5327) 52.4222 Tj
17.4613 -189.8668 Td
(5107 5117 5202 5223) 83.0018 Tj
-8527.14 TJm
(0331 1276 1814 1841) 83.0018 Tj
0 -199.3602 Td
(kill 2075) 39.3166 Tj
-15550.3 TJm
(1871 3683 3839 3924) 83.0018 Tj
17.4613 -208.8535 Td
(0305 2075 2650 2933) 83.0018 Tj
-8527.14 TJm
(4121 4171 4329 4331) 83.0018 Tj
17.4613 -218.3469 Td
(6767) 17.4741 Tj
-16052.1 TJm
(5088 5327 6474) 61.1592 Tj
0 -227.8403 Td
(kinit 2277) 43.6851 Tj
-13042.1 TJm
(memset 5304) 48.0537 Tj
17.4613 -237.3336 Td
(0263 1226 2277) 61.1592 Tj
-11035.5 TJm
(0332 1789 1813 1816) 83.0018 Tj
0 -246.827 Td
(ksegment 1703) 56.7907 Tj
-13543.7 TJm
(1842 2313 3694 3814) 83.0018 Tj
17.4613 -256.3203 Td
(0309 1219 1257 1703) 83.0018 Tj
-8527.14 TJm
(4784 4959 5061 5075) 83.0018 Tj
0 -265.8137 Td
(KSTACKSIZE 0152) 65.5277 Tj
-12540.3 TJm
(5304 6476 6987 7058) 83.0018 Tj
17.4613 -275.3071 Td
(0152 1283 1284 1730) 83.0018 Tj
-8527.14 TJm
(7069 7085 7106 7119) 83.0018 Tj
17.4613 -284.8004 Td
(1772 1776 1866 2170) 83.0018 Tj
-6520.6 TJm
(microdelay 5781) 65.5277 Tj
0 -294.2938 Td
(lapiceoi 5772) 56.7907 Tj
-13543.7 TJm
(0274 5781 5823 5825) 83.0018 Tj
17.4613 -303.7871 Td
(0271 2621 2625 2629) 83.0018 Tj
-8527.14 TJm
(5835) 17.4741 Tj
17.4613 -313.2805 Td
(2633 2639 5772) 61.1592 Tj
-9028.94 TJm
(min 3673) 34.9481 Tj
0 -322.7739 Td
(lapicinit 5701) 61.1592 Tj
-13042 TJm
(3673 4120 4170) 61.1592 Tj
17.4613 -332.2668 Td
(0272 1218 1256 5701) 83.0018 Tj
-6520.6 TJm
(mp 5402) 30.5796 Tj
0 -341.7602 Td
(lapicstartap 5805) 74.2647 Tj
-11537 TJm
(5402 5507 5536 5542) 83.0018 Tj
17.4613 -351.2536 Td
(0273 1286 5805) 61.1592 Tj
-11035.5 TJm
(5543 5544 5555 5560) 83.0018 Tj
0 -360.7469 Td
(lapicw 5690) 48.0537 Tj
-14547 TJm
(5564 5565 5568 5569) 83.0018 Tj
17.4613 -370.2403 Td
(5690 5707 5713 5714) 83.0018 Tj
-8527.14 TJm
(5580 5583 5585 5587) 83.0018 Tj
17.4613 -379.7336 Td
(5715 5718 5719 5724) 83.0018 Tj
-8527.14 TJm
(5594 5604 5610 5642) 83.0018 Tj
17.4613 -389.227 Td
(5727 5730 5731 5734) 83.0018 Tj
-6520.6 TJm
(mpbcpu 5519) 48.0537 Tj
17.4613 -398.7204 Td
(5737 5738 5743 5775) 83.0018 Tj
-8527.14 TJm
(0278 1218 1255 5519) 83.0018 Tj
17.4613 -408.2137 Td
(5821 5822 5824 5833) 83.0018 Tj
-6520.6 TJm
(MPBUS 5452) 43.6851 Tj
17.4613 -417.7071 Td
(5834) 17.4741 Tj
-16052.1 TJm
(5452 5631) 39.3166 Tj
0 -427.2004 Td
(lgdt 0453) 39.3166 Tj
-13543.8 TJm
(mpconf 5413) 48.0537 Tj
17.4613 -436.6938 Td
(0453 0461 0954 1054) 83.0018 Tj
-8527.14 TJm
(5413 5579 5582 5587) 83.0018 Tj
17.4613 -446.1872 Td
(1711) 17.4741 Tj
-16052.1 TJm
(5605) 17.4741 Tj
0 -455.6805 Td
(lidt 0467) 39.3166 Tj
-13543.8 TJm
(mpconfig 5580) 56.7907 Tj
17.4613 -465.1739 Td
(0467 0475 2580) 61.1592 Tj
-11035.5 TJm
(5580 5610) 39.3166 Tj
0 -474.6668 Td
(LINT0 5679) 43.6851 Tj
-13042.1 TJm
(mpinit 5601) 48.0537 Tj
17.4613 -484.1602 Td
(5679 5718) 39.3166 Tj
-13543.8 TJm
(0279 1217 5601 5637) 83.0018 Tj
0 -493.6536 Td
(LINT1 5680) 43.6851 Tj
-15048.7 TJm
(5638) 17.4741 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 5 5
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
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0 -446.1809 Td
(run 2262) 34.9481 Tj
-14045.5 TJm
(SETGATE 0821) 52.4222 Tj
17.4613 -455.6743 Td
(1661 2262 2263 2269) 83.0018 Tj
-8527.14 TJm
(0821 2571 2572) 61.1592 Tj
17.4613 -465.1673 Td
(2307 2316 2317 2319) 83.0018 Tj
-6520.6 TJm
(SHIFT 6108) 43.6851 Tj
17.4613 -474.6602 Td
(2357) 17.4741 Tj
-16052.1 TJm
(6108 6136 6137 6285) 83.0018 Tj
0 -484.1536 Td
(runcmd 6906) 48.0537 Tj
-12540.5 TJm
(skipelem 4315) 56.7907 Tj
17.4613 -493.6469 Td
(6906 6920 6937 6943) 83.0018 Tj
-8527.14 TJm
(4315 4363) 39.3166 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  cross-references  Page 10) 192.2146 Tj
0 -28.4801 Td
(sleep 2003) 43.6851 Tj
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17.4613 -85.4391 Td
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17.4613 -94.9321 Td
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17.4613 -123.411 Td
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(6764 6765 6766 6767) 83.0018 Tj
17.4613 -189.8625 Td
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17.4613 -208.8493 Td
(0913 0914 0975 1027) 83.0018 Tj
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17.4613 -218.3422 Td
(1028 1075 1076 6706) 83.0018 Tj
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17.4613 -313.2743 Td
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17.4613 -379.727 Td
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17.4613 -408.2067 Td
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17.4613 -465.1669 Td
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17.4613 -484.1532 Td
(0729 1727) 39.3166 Tj
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(sys_getpid 2937) 65.5277 Tj
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(STS_TG32 0733) 56.7907 Tj
-13543.7 TJm
(2836 2858 2937) 61.1592 Tj
Q
Q
Q
Q
showpage
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q
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[0.1 0 0 0.1 0 0] cm
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180 3960 5760 3460 re
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/DeviceGray {} CS
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[10 0 0 10 0 0] cm
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(3101 4814 4862) 61.1592 Tj
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17.4613 -170.8801 Td
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17.4613 -303.7868 Td
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(2844 2866 2951) 61.1592 Tj
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-11537.3 TJm
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17.4613 -379.7332 Td
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(T_IRQ0 2429) 48.0537 Tj
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(sys_unlink 4751) 65.5277 Tj
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17.4613 -398.72 Td
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-13543.8 TJm
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0 -465.1735 Td
(sys_write 4627) 61.1592 Tj
-13042 TJm
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17.4613 -474.6665 Td
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17.4613 -493.6532 Td
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-11537.3 TJm
(trapret 2529) 52.4222 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
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17.4613 -28.4801 Td
(1617 1785 2528 2529) 83.0018 Tj
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(waitdisk 1151) 56.7907 Tj
0 -37.9735 Td
(T_SYSCALL 2426) 61.1592 Tj
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17.4613 -47.4664 Td
(2426 2572 2603 6712) 83.0018 Tj
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(wakeup 2064) 48.0537 Tj
17.4613 -56.9598 Td
(6717 6757) 39.3166 Tj
-13543.8 TJm
(0314 2064 2618 3422) 83.0018 Tj
0 -66.4531 Td
(tvinit 2566) 48.0537 Tj
-14547 TJm
(3639 3941 3966 5216) 83.0018 Tj
17.4613 -75.9465 Td
(0353 1228 2566) 61.1592 Tj
-11035.5 TJm
(5219 5241 5246 5268) 83.0018 Tj
0 -85.4399 Td
(usegment 1722) 56.7907 Tj
-13543.7 TJm
(6541) 17.4741 Tj
17.4613 -94.9332 Td
(0310 1722 1846 1926) 83.0018 Tj
-6520.6 TJm
(wakeup1 2053) 52.4222 Tj
17.4613 -104.4266 Td
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(0312 1235 1802) 61.1592 Tj
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(VER 5661) 34.9481 Tj
-16052 TJm
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17.4613 -142.4 Td
(5661 5723) 39.3166 Tj
-11537.3 TJm
(xchg 0501) 39.3166 Tj
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(wait 2153) 39.3166 Tj
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(0501 1260 1382 1419) 83.0018 Tj
17.4613 -161.3867 Td
(0313 2153 2923 6762) 83.0018 Tj
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(yield 1973) 43.6851 Tj
17.4613 -170.8801 Td
(6833 6944 6970 6971) 83.0018 Tj
-8527.14 TJm
(0315 1973 2664) 61.1592 Tj
17.4613 -180.3735 Td
(7026) 17.4741 Tj
Q
Q
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Q
showpage
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180 3960 5760 3460 re
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(Aug  8 01:04 2009  xv6/types.h  Page 1) 166.0035 Tj
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(0100 typedef unsigned int   uint;) 144.161 Tj
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(0101 typedef unsigned short ushort;) 152.898 Tj
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(0103 ) 21.8426 Tj
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(0104 ) 21.8426 Tj
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(0105 ) 21.8426 Tj
0 -85.4403 Td
(0106 ) 21.8426 Tj
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(0107 ) 21.8426 Tj
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(0108 ) 21.8426 Tj
0 -113.9203 Td
(0109 ) 21.8426 Tj
0 -123.4137 Td
(0110 ) 21.8426 Tj
0 -132.9071 Td
(0111 ) 21.8426 Tj
0 -142.4004 Td
(0112 ) 21.8426 Tj
0 -151.8938 Td
(0113 ) 21.8426 Tj
0 -161.3871 Td
(0114 ) 21.8426 Tj
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(0115 ) 21.8426 Tj
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(0116 ) 21.8426 Tj
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(0117 ) 21.8426 Tj
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(0118 ) 21.8426 Tj
0 -208.8539 Td
(0119 ) 21.8426 Tj
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(0120 ) 21.8426 Tj
0 -227.8407 Td
(0121 ) 21.8426 Tj
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(0122 ) 21.8426 Tj
0 -246.8274 Td
(0123 ) 21.8426 Tj
0 -256.3207 Td
(0124 ) 21.8426 Tj
0 -265.8141 Td
(0125 ) 21.8426 Tj
0 -275.3075 Td
(0126 ) 21.8426 Tj
0 -284.8008 Td
(0127 ) 21.8426 Tj
0 -294.2942 Td
(0128 ) 21.8426 Tj
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(0129 ) 21.8426 Tj
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(0130 ) 21.8426 Tj
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(0131 ) 21.8426 Tj
0 -332.2676 Td
(0132 ) 21.8426 Tj
0 -341.761 Td
(0133 ) 21.8426 Tj
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(0134 ) 21.8426 Tj
0 -360.7477 Td
(0135 ) 21.8426 Tj
0 -370.2411 Td
(0136 ) 21.8426 Tj
0 -379.7344 Td
(0137 ) 21.8426 Tj
0 -389.2278 Td
(0138 ) 21.8426 Tj
0 -398.7211 Td
(0139 ) 21.8426 Tj
0 -408.2145 Td
(0140 ) 21.8426 Tj
0 -417.7079 Td
(0141 ) 21.8426 Tj
0 -427.2012 Td
(0142 ) 21.8426 Tj
0 -436.6946 Td
(0143 ) 21.8426 Tj
0 -446.1879 Td
(0144 ) 21.8426 Tj
0 -455.6813 Td
(0145 ) 21.8426 Tj
0 -465.1747 Td
(0146 ) 21.8426 Tj
0 -474.668 Td
(0147 ) 21.8426 Tj
0 -484.1614 Td
(0148 ) 21.8426 Tj
0 -493.6547 Td
(0149 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 01) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/param.h  Page 1) 166.0035 Tj
0 -28.4801 Td
(0150 #define NPROC        64  // maximum number of processes) 262.1109 Tj
0 -37.9735 Td
(0151 #define PAGE       4096  // granularity of user-space memo\
ry allocation) 332.0071 Tj
0 -47.4668 Td
(0152 #define KSTACKSIZE PAGE  // size of per-process kernel sta\
ck) 283.9534 Tj
0 -56.9602 Td
(0153 #define NCPU          8  // maximum number of CPUs) 240.2683 Tj
0 -66.4535 Td
(0154 #define NOFILE       16  // open files per process) 240.2683 Tj
0 -75.9469 Td
(0155 #define NFILE       100  // open files per system) 235.8998 Tj
0 -85.4403 Td
(0156 #define NBUF         10  // size of disk block cache) 249.0053 Tj
0 -94.9336 Td
(0157 #define NINODE       50  // maximum number of active i-nod\
es) 283.9534 Tj
0 -104.427 Td
(0158 #define NDEV         10  // maximum major device number) 262.1109 Tj
0 -113.9203 Td
(0159 #define ROOTDEV       1  // device number of file system r\
oot disk) 310.1645 Tj
0 -123.4137 Td
(0160 ) 21.8426 Tj
0 -132.9071 Td
(0161 ) 21.8426 Tj
0 -142.4004 Td
(0162 ) 21.8426 Tj
0 -151.8938 Td
(0163 ) 21.8426 Tj
0 -161.3871 Td
(0164 ) 21.8426 Tj
0 -170.8805 Td
(0165 ) 21.8426 Tj
0 -180.3739 Td
(0166 ) 21.8426 Tj
0 -189.8672 Td
(0167 ) 21.8426 Tj
0 -199.3606 Td
(0168 ) 21.8426 Tj
0 -208.8539 Td
(0169 ) 21.8426 Tj
0 -218.3473 Td
(0170 ) 21.8426 Tj
0 -227.8407 Td
(0171 ) 21.8426 Tj
0 -237.334 Td
(0172 ) 21.8426 Tj
0 -246.8274 Td
(0173 ) 21.8426 Tj
0 -256.3207 Td
(0174 ) 21.8426 Tj
0 -265.8141 Td
(0175 ) 21.8426 Tj
0 -275.3075 Td
(0176 ) 21.8426 Tj
0 -284.8008 Td
(0177 ) 21.8426 Tj
0 -294.2942 Td
(0178 ) 21.8426 Tj
0 -303.7875 Td
(0179 ) 21.8426 Tj
0 -313.2809 Td
(0180 ) 21.8426 Tj
0 -322.7743 Td
(0181 ) 21.8426 Tj
0 -332.2676 Td
(0182 ) 21.8426 Tj
0 -341.761 Td
(0183 ) 21.8426 Tj
0 -351.2543 Td
(0184 ) 21.8426 Tj
0 -360.7477 Td
(0185 ) 21.8426 Tj
0 -370.2411 Td
(0186 ) 21.8426 Tj
0 -379.7344 Td
(0187 ) 21.8426 Tj
0 -389.2278 Td
(0188 ) 21.8426 Tj
0 -398.7211 Td
(0189 ) 21.8426 Tj
0 -408.2145 Td
(0190 ) 21.8426 Tj
0 -417.7079 Td
(0191 ) 21.8426 Tj
0 -427.2012 Td
(0192 ) 21.8426 Tj
0 -436.6946 Td
(0193 ) 21.8426 Tj
0 -446.1879 Td
(0194 ) 21.8426 Tj
0 -455.6813 Td
(0195 ) 21.8426 Tj
0 -465.1747 Td
(0196 ) 21.8426 Tj
0 -474.668 Td
(0197 ) 21.8426 Tj
0 -484.1614 Td
(0198 ) 21.8426 Tj
0 -493.6547 Td
(0199 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 01) 34.9481 Tj
Q
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Q
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%%PageTrailer
pdfEndPage
%%Page: 9 9
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%%PageOrientation: Landscape
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180 rotate
-612 -792 translate
0 0 612 792 re W
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[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/defs.h  Page 1) 161.635 Tj
0 -28.4801 Td
(0200 struct buf;) 69.8962 Tj
0 -37.9735 Td
(0201 struct context;) 87.3703 Tj
0 -47.4668 Td
(0202 struct file;) 74.2647 Tj
0 -56.9602 Td
(0203 struct inode;) 78.6333 Tj
0 -66.4535 Td
(0204 struct pipe;) 74.2647 Tj
0 -75.9469 Td
(0205 struct proc;) 74.2647 Tj
0 -85.4403 Td
(0206 struct spinlock;) 91.7388 Tj
0 -94.9336 Td
(0207 struct stat;) 74.2647 Tj
0 -104.427 Td
(0208 ) 21.8426 Tj
0 -113.9203 Td
(0209 // bio.c) 56.7907 Tj
0 -123.4137 Td
(0210 void            binit\(void\);) 144.161 Tj
0 -132.9071 Td
(0211 struct buf*     bread\(uint, uint\);) 170.3721 Tj
0 -142.4004 Td
(0212 void            brelse\(struct buf*\);) 179.1091 Tj
0 -151.8938 Td
(0213 void            bwrite\(struct buf*\);) 179.1091 Tj
0 -161.3871 Td
(0214 ) 21.8426 Tj
0 -170.8805 Td
(0215 // console.c) 74.2647 Tj
0 -180.3739 Td
(0216 void            consoleinit\(void\);) 170.3721 Tj
0 -189.8672 Td
(0217 void            cprintf\(char*, ...\);) 179.1091 Tj
0 -199.3606 Td
(0218 void            consoleintr\(int\(*\)\(void\)\);) 205.3202 Tj
0 -208.8539 Td
(0219 void            panic\(char*\) __attribute__\(\(noreturn\)\
\);) 262.1109 Tj
0 -218.3473 Td
(0220 ) 21.8426 Tj
0 -227.8407 Td
(0221 // exec.c) 61.1592 Tj
0 -237.334 Td
(0222 int             exec\(char*, char**\);) 179.1091 Tj
0 -246.8274 Td
(0223 ) 21.8426 Tj
0 -256.3207 Td
(0224 // file.c) 61.1592 Tj
0 -265.8141 Td
(0225 struct file*    filealloc\(void\);) 161.635 Tj
0 -275.3075 Td
(0226 void            fileclose\(struct file*\);) 196.5831 Tj
0 -284.8008 Td
(0227 struct file*    filedup\(struct file*\);) 187.8461 Tj
0 -294.2942 Td
(0228 void            fileinit\(void\);) 157.2665 Tj
0 -303.7875 Td
(0229 int             fileread\(struct file*, char*, int n\);) 253.3738 Tj
0 -313.2809 Td
(0230 int             filestat\(struct file*, struct stat*\);) 253.3738 Tj
0 -322.7743 Td
(0231 int             filewrite\(struct file*, char*, int n\);) 257.7424 Tj
0 -332.2676 Td
(0232 ) 21.8426 Tj
0 -341.761 Td
(0233 // fs.c) 52.4222 Tj
0 -351.2543 Td
(0234 int             dirlink\(struct inode*, char*, uint\);) 249.0053 Tj
0 -360.7477 Td
(0235 struct inode*   dirlookup\(struct inode*, char*, uint*\);) 262.1109 Tj
0 -370.2411 Td
(0236 struct inode*   ialloc\(uint, short\);) 179.1091 Tj
0 -379.7344 Td
(0237 struct inode*   idup\(struct inode*\);) 179.1091 Tj
0 -389.2278 Td
(0238 void            iinit\(void\);) 144.161 Tj
0 -398.7211 Td
(0239 void            ilock\(struct inode*\);) 183.4776 Tj
0 -408.2145 Td
(0240 void            iput\(struct inode*\);) 179.1091 Tj
0 -417.7079 Td
(0241 void            iunlock\(struct inode*\);) 192.2146 Tj
0 -427.2012 Td
(0242 void            iunlockput\(struct inode*\);) 205.3202 Tj
0 -436.6946 Td
(0243 void            iupdate\(struct inode*\);) 192.2146 Tj
0 -446.1879 Td
(0244 int             namecmp\(const char*, const char*\);) 240.2683 Tj
0 -455.6813 Td
(0245 struct inode*   namei\(char*\);) 148.5295 Tj
0 -465.1747 Td
(0246 struct inode*   nameiparent\(char*, char*\);) 205.3202 Tj
0 -474.668 Td
(0247 int             readi\(struct inode*, char*, uint, uint\);) 266.4794 Tj
0 -484.1614 Td
(0248 void            stati\(struct inode*, struct stat*\);) 244.6368 Tj
0 -493.6547 Td
(0249 int             writei\(struct inode*, char*, uint, uint\)\
;) 270.8479 Tj
0 -522.1348 Td
(Sheet 02) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/defs.h  Page 2) 161.635 Tj
0 -28.4801 Td
(0250 // ide.c) 56.7907 Tj
0 -37.9735 Td
(0251 void            ideinit\(void\);) 152.898 Tj
0 -47.4668 Td
(0252 void            ideintr\(void\);) 152.898 Tj
0 -56.9602 Td
(0253 void            iderw\(struct buf*\);) 174.7406 Tj
0 -66.4535 Td
(0254 ) 21.8426 Tj
0 -75.9469 Td
(0255 // ioapic.c) 69.8962 Tj
0 -85.4403 Td
(0256 void            ioapicenable\(int irq, int cpu\);) 227.1628 Tj
0 -94.9336 Td
(0257 extern uchar    ioapicid;) 131.0554 Tj
0 -104.427 Td
(0258 void            ioapicinit\(void\);) 166.0035 Tj
0 -113.9203 Td
(0259 ) 21.8426 Tj
0 -123.4137 Td
(0260 // kalloc.c) 69.8962 Tj
0 -132.9071 Td
(0261 char*           kalloc\(int\);) 144.161 Tj
0 -142.4004 Td
(0262 void            kfree\(char*, int\);) 170.3721 Tj
0 -151.8938 Td
(0263 void            kinit\(void\);) 144.161 Tj
0 -161.3871 Td
(0264 ) 21.8426 Tj
0 -170.8805 Td
(0265 // kbd.c) 56.7907 Tj
0 -180.3739 Td
(0266 void            kbdintr\(void\);) 152.898 Tj
0 -189.8672 Td
(0267 ) 21.8426 Tj
0 -199.3606 Td
(0268 // lapic.c) 65.5277 Tj
0 -208.8539 Td
(0269 int             cpu\(void\);) 135.4239 Tj
0 -218.3473 Td
(0270 extern volatile uint*    lapic;) 157.2665 Tj
0 -227.8407 Td
(0271 void            lapiceoi\(void\);) 157.2665 Tj
0 -237.334 Td
(0272 void            lapicinit\(int\);) 157.2665 Tj
0 -246.8274 Td
(0273 void            lapicstartap\(uchar, uint\);) 205.3202 Tj
0 -256.3207 Td
(0274 void            microdelay\(int\);) 161.635 Tj
0 -265.8141 Td
(0275 ) 21.8426 Tj
0 -275.3075 Td
(0276 // mp.c) 52.4222 Tj
0 -284.8008 Td
(0277 extern int      ismp;) 113.5814 Tj
0 -294.2942 Td
(0278 int             mpbcpu\(void\);) 148.5295 Tj
0 -303.7875 Td
(0279 void            mpinit\(void\);) 148.5295 Tj
0 -313.2809 Td
(0280 void            mpstartthem\(void\);) 170.3721 Tj
0 -322.7743 Td
(0281 ) 21.8426 Tj
0 -332.2676 Td
(0282 // picirq.c) 69.8962 Tj
0 -341.761 Td
(0283 void            picenable\(int\);) 157.2665 Tj
0 -351.2543 Td
(0284 void            picinit\(void\);) 152.898 Tj
0 -360.7477 Td
(0285 ) 21.8426 Tj
0 -370.2411 Td
(0286 // pipe.c) 61.1592 Tj
0 -379.7344 Td
(0287 int             pipealloc\(struct file**, struct file**\);) 266.4794 Tj
0 -389.2278 Td
(0288 void            pipeclose\(struct pipe*, int\);) 218.4257 Tj
0 -398.7211 Td
(0289 int             piperead\(struct pipe*, char*, int\);) 244.6368 Tj
0 -408.2145 Td
(0290 int             pipewrite\(struct pipe*, char*, int\);) 249.0053 Tj
0 -417.7079 Td
(0291 ) 21.8426 Tj
0 -427.2012 Td
(0292 ) 21.8426 Tj
0 -436.6946 Td
(0293 ) 21.8426 Tj
0 -446.1879 Td
(0294 ) 21.8426 Tj
0 -455.6813 Td
(0295 ) 21.8426 Tj
0 -465.1747 Td
(0296 ) 21.8426 Tj
0 -474.668 Td
(0297 ) 21.8426 Tj
0 -484.1614 Td
(0298 ) 21.8426 Tj
0 -493.6547 Td
(0299 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 02) 34.9481 Tj
Q
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-612 -792 translate
0 0 612 792 re W
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[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/defs.h  Page 3) 161.635 Tj
0 -28.4801 Td
(0300 // proc.c) 61.1592 Tj
0 -37.9735 Td
(0301 struct proc*    copyproc\(struct proc*\);) 192.2146 Tj
0 -47.4668 Td
(0302 void            exit\(void\);) 139.7925 Tj
0 -56.9602 Td
(0303 int             fork\(void\);) 139.7925 Tj
0 -66.4535 Td
(0304 int             growproc\(int\);) 152.898 Tj
0 -75.9469 Td
(0305 int             kill\(int\);) 135.4239 Tj
0 -85.4403 Td
(0306 void            pinit\(void\);) 144.161 Tj
0 -94.9336 Td
(0307 void            procdump\(void\);) 157.2665 Tj
0 -104.427 Td
(0308 void            scheduler\(void\) __attribute__\(\(noretur\
n\)\);) 275.2164 Tj
0 -113.9203 Td
(0309 void            ksegment\(void\);) 157.2665 Tj
0 -123.4137 Td
(0310 void            usegment\(void\);) 157.2665 Tj
0 -132.9071 Td
(0311 void            sleep\(void*, struct spinlock*\);) 227.1628 Tj
0 -142.4004 Td
(0312 void            userinit\(void\);) 157.2665 Tj
0 -151.8938 Td
(0313 int             wait\(void\);) 139.7925 Tj
0 -161.3871 Td
(0314 void            wakeup\(void*\);) 152.898 Tj
0 -170.8805 Td
(0315 void            yield\(void\);) 144.161 Tj
0 -180.3739 Td
(0316 ) 21.8426 Tj
0 -189.8672 Td
(0317 // swtch.S) 65.5277 Tj
0 -199.3606 Td
(0318 void            swtch\(struct context**, struct context*\)\
;) 270.8479 Tj
0 -208.8539 Td
(0319 ) 21.8426 Tj
0 -218.3473 Td
(0320 // spinlock.c) 78.6333 Tj
0 -227.8407 Td
(0321 void            acquire\(struct spinlock*\);) 205.3202 Tj
0 -237.334 Td
(0322 void            getcallerpcs\(void*, uint*\);) 209.6887 Tj
0 -246.8274 Td
(0323 int             holding\(struct spinlock*\);) 205.3202 Tj
0 -256.3207 Td
(0324 void            initlock\(struct spinlock*, char*\);) 240.2683 Tj
0 -265.8141 Td
(0325 void            release\(struct spinlock*\);) 205.3202 Tj
0 -275.3075 Td
(0326 void            pushcli\(\);) 135.4239 Tj
0 -284.8008 Td
(0327 void            popcli\(\);) 131.0554 Tj
0 -294.2942 Td
(0328 ) 21.8426 Tj
0 -303.7875 Td
(0329 // string.c) 69.8962 Tj
0 -313.2809 Td
(0330 int             memcmp\(const void*, const void*, uint\);) 262.1109 Tj
0 -322.7743 Td
(0331 void*           memmove\(void*, const void*, uint\);) 240.2683 Tj
0 -332.2676 Td
(0332 void*           memset\(void*, int, uint\);) 200.9517 Tj
0 -341.761 Td
(0333 char*           safestrcpy\(char*, const char*, int\);) 249.0053 Tj
0 -351.2543 Td
(0334 int             strlen\(const char*\);) 179.1091 Tj
0 -360.7477 Td
(0335 int             strncmp\(const char*, const char*, uint\);) 266.4794 Tj
0 -370.2411 Td
(0336 char*           strncpy\(char*, const char*, int\);) 235.8998 Tj
0 -379.7344 Td
(0337 ) 21.8426 Tj
0 -389.2278 Td
(0338 // syscall.c) 74.2647 Tj
0 -398.7211 Td
(0339 int             argint\(int, int*\);) 170.3721 Tj
0 -408.2145 Td
(0340 int             argptr\(int, char**, int\);) 200.9517 Tj
0 -417.7079 Td
(0341 int             argstr\(int, char**\);) 179.1091 Tj
0 -427.2012 Td
(0342 int             fetchint\(struct proc*, uint, int*\);) 244.6368 Tj
0 -436.6946 Td
(0343 int             fetchstr\(struct proc*, uint, char**\);) 253.3738 Tj
0 -446.1879 Td
(0344 void            syscall\(void\);) 152.898 Tj
0 -455.6813 Td
(0345 ) 21.8426 Tj
0 -465.1747 Td
(0346 // timer.c) 65.5277 Tj
0 -474.668 Td
(0347 void            timerinit\(void\);) 161.635 Tj
0 -484.1614 Td
(0348 ) 21.8426 Tj
0 -493.6547 Td
(0349 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 03) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/defs.h  Page 4) 161.635 Tj
0 -28.4801 Td
(0350 // trap.c) 61.1592 Tj
0 -37.9735 Td
(0351 void            idtinit\(void\);) 152.898 Tj
0 -47.4668 Td
(0352 extern int      ticks;) 117.9499 Tj
0 -56.9602 Td
(0353 void            tvinit\(void\);) 148.5295 Tj
0 -66.4535 Td
(0354 extern struct spinlock tickslock;) 166.0035 Tj
0 -75.9469 Td
(0355 ) 21.8426 Tj
0 -85.4403 Td
(0356 // uart.c) 61.1592 Tj
0 -94.9336 Td
(0357 void            uartinit\(void\);) 157.2665 Tj
0 -104.427 Td
(0358 void            uartintr\(void\);) 157.2665 Tj
0 -113.9203 Td
(0359 void            uartputc\(int\);) 152.898 Tj
0 -123.4137 Td
(0360 ) 21.8426 Tj
0 -132.9071 Td
(0361 // number of elements in fixed-size array) 200.9517 Tj
0 -142.4004 Td
(0362 #define NELEM\(x\) \(sizeof\(x\)/sizeof\(\(x\)[0]\)\)) 209.6887 Tj
0 -151.8938 Td
(0363 ) 21.8426 Tj
0 -161.3871 Td
(0364 ) 21.8426 Tj
0 -170.8805 Td
(0365 ) 21.8426 Tj
0 -180.3739 Td
(0366 ) 21.8426 Tj
0 -189.8672 Td
(0367 ) 21.8426 Tj
0 -199.3606 Td
(0368 ) 21.8426 Tj
0 -208.8539 Td
(0369 ) 21.8426 Tj
0 -218.3473 Td
(0370 ) 21.8426 Tj
0 -227.8407 Td
(0371 ) 21.8426 Tj
0 -237.334 Td
(0372 ) 21.8426 Tj
0 -246.8274 Td
(0373 ) 21.8426 Tj
0 -256.3207 Td
(0374 ) 21.8426 Tj
0 -265.8141 Td
(0375 ) 21.8426 Tj
0 -275.3075 Td
(0376 ) 21.8426 Tj
0 -284.8008 Td
(0377 ) 21.8426 Tj
0 -294.2942 Td
(0378 ) 21.8426 Tj
0 -303.7875 Td
(0379 ) 21.8426 Tj
0 -313.2809 Td
(0380 ) 21.8426 Tj
0 -322.7743 Td
(0381 ) 21.8426 Tj
0 -332.2676 Td
(0382 ) 21.8426 Tj
0 -341.761 Td
(0383 ) 21.8426 Tj
0 -351.2543 Td
(0384 ) 21.8426 Tj
0 -360.7477 Td
(0385 ) 21.8426 Tj
0 -370.2411 Td
(0386 ) 21.8426 Tj
0 -379.7344 Td
(0387 ) 21.8426 Tj
0 -389.2278 Td
(0388 ) 21.8426 Tj
0 -398.7211 Td
(0389 ) 21.8426 Tj
0 -408.2145 Td
(0390 ) 21.8426 Tj
0 -417.7079 Td
(0391 ) 21.8426 Tj
0 -427.2012 Td
(0392 ) 21.8426 Tj
0 -436.6946 Td
(0393 ) 21.8426 Tj
0 -446.1879 Td
(0394 ) 21.8426 Tj
0 -455.6813 Td
(0395 ) 21.8426 Tj
0 -465.1747 Td
(0396 ) 21.8426 Tj
0 -474.668 Td
(0397 ) 21.8426 Tj
0 -484.1614 Td
(0398 ) 21.8426 Tj
0 -493.6547 Td
(0399 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 03) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 11 11
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/x86.h  Page 1) 157.2665 Tj
0 -28.4801 Td
(0400 // Routines to let C code use special x86 instructions.) 262.1109 Tj
0 -37.9735 Td
(0401 ) 21.8426 Tj
0 -47.4668 Td
(0402 static inline uchar) 104.8443 Tj
0 -56.9602 Td
(0403 inb\(ushort port\)) 91.7388 Tj
0 -66.4535 Td
(0404 {) 26.2111 Tj
0 -75.9469 Td
(0405   uchar data;) 78.6333 Tj
0 -85.4403 Td
(0406 ) 21.8426 Tj
0 -94.9336 Td
(0407   asm volatile\("in %1,%0" : "=a" \(data\) : "d" \(port\)\)\
;) 257.7424 Tj
0 -104.427 Td
(0408   return data;) 83.0018 Tj
0 -113.9203 Td
(0409 }) 26.2111 Tj
0 -123.4137 Td
(0410 ) 21.8426 Tj
0 -132.9071 Td
(0411 static inline void) 100.4758 Tj
0 -142.4004 Td
(0412 insl\(int port, void *addr, int cnt\)) 174.7406 Tj
0 -151.8938 Td
(0413 {) 26.2111 Tj
0 -161.3871 Td
(0414   asm volatile\("cld; rep insl" :) 161.635 Tj
0 -170.8805 Td
(0415                "=D" \(addr\), "=c" \(cnt\) :) 196.5831 Tj
0 -180.3739 Td
(0416                "d" \(port\), "0" \(addr\), "1" \(cnt\) :) 240.2683 Tj
0 -189.8672 Td
(0417                "memory", "cc"\);) 157.2665 Tj
0 -199.3606 Td
(0418 }) 26.2111 Tj
0 -208.8539 Td
(0419 ) 21.8426 Tj
0 -218.3473 Td
(0420 static inline void) 100.4758 Tj
0 -227.8407 Td
(0421 outb\(ushort port, uchar data\)) 148.5295 Tj
0 -237.334 Td
(0422 {) 26.2111 Tj
0 -246.8274 Td
(0423   asm volatile\("out %0,%1" : : "a" \(data\), "d" \(port\)\
\);) 262.1109 Tj
0 -256.3207 Td
(0424 }) 26.2111 Tj
0 -265.8141 Td
(0425 ) 21.8426 Tj
0 -275.3075 Td
(0426 static inline void) 100.4758 Tj
0 -284.8008 Td
(0427 outw\(ushort port, ushort data\)) 152.898 Tj
0 -294.2942 Td
(0428 {) 26.2111 Tj
0 -303.7875 Td
(0429   asm volatile\("out %0,%1" : : "a" \(data\), "d" \(port\)\
\);) 262.1109 Tj
0 -313.2809 Td
(0430 }) 26.2111 Tj
0 -322.7743 Td
(0431 ) 21.8426 Tj
0 -332.2676 Td
(0432 static inline void) 100.4758 Tj
0 -341.761 Td
(0433 outsl\(int port, const void *addr, int cnt\)) 205.3202 Tj
0 -351.2543 Td
(0434 {) 26.2111 Tj
0 -360.7477 Td
(0435   asm volatile\("cld; rep outsl" :) 166.0035 Tj
0 -370.2411 Td
(0436                "=S" \(addr\), "=c" \(cnt\) :) 196.5831 Tj
0 -379.7344 Td
(0437                "d" \(port\), "0" \(addr\), "1" \(cnt\) :) 240.2683 Tj
0 -389.2278 Td
(0438                "cc"\);) 113.5814 Tj
0 -398.7211 Td
(0439 }) 26.2111 Tj
0 -408.2145 Td
(0440 ) 21.8426 Tj
0 -417.7079 Td
(0441 static inline void) 100.4758 Tj
0 -427.2012 Td
(0442 stosb\(void *addr, int data, int cnt\)) 179.1091 Tj
0 -436.6946 Td
(0443 {) 26.2111 Tj
0 -446.1879 Td
(0444   asm volatile\("cld; rep stosb" :) 166.0035 Tj
0 -455.6813 Td
(0445                "=D" \(addr\), "=c" \(cnt\) :) 196.5831 Tj
0 -465.1747 Td
(0446                "0" \(addr\), "1" \(cnt\), "a" \(data\) :) 240.2683 Tj
0 -474.668 Td
(0447                "memory", "cc"\);) 157.2665 Tj
0 -484.1614 Td
(0448 }) 26.2111 Tj
0 -493.6547 Td
(0449 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 04) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/x86.h  Page 2) 157.2665 Tj
0 -28.4801 Td
(0450 struct segdesc;) 87.3703 Tj
0 -37.9735 Td
(0451 ) 21.8426 Tj
0 -47.4668 Td
(0452 static inline void) 100.4758 Tj
0 -56.9602 Td
(0453 lgdt\(struct segdesc *p, int size\)) 166.0035 Tj
0 -66.4535 Td
(0454 {) 26.2111 Tj
0 -75.9469 Td
(0455   volatile ushort pd[3];) 126.6869 Tj
0 -85.4403 Td
(0456 ) 21.8426 Tj
0 -94.9336 Td
(0457   pd[0] = size-1;) 96.1073 Tj
0 -104.427 Td
(0458   pd[1] = \(uint\)p;) 100.4758 Tj
0 -113.9203 Td
(0459   pd[2] = \(uint\)p >> 16;) 126.6869 Tj
0 -123.4137 Td
(0460 ) 21.8426 Tj
0 -132.9071 Td
(0461   asm volatile\("lgdt \(%0\)" : : "r" \(pd\)\);) 200.9517 Tj
0 -142.4004 Td
(0462 }) 26.2111 Tj
0 -151.8938 Td
(0463 ) 21.8426 Tj
0 -161.3871 Td
(0464 struct gatedesc;) 91.7388 Tj
0 -170.8805 Td
(0465 ) 21.8426 Tj
0 -180.3739 Td
(0466 static inline void) 100.4758 Tj
0 -189.8672 Td
(0467 lidt\(struct gatedesc *p, int size\)) 170.3721 Tj
0 -199.3606 Td
(0468 {) 26.2111 Tj
0 -208.8539 Td
(0469   volatile ushort pd[3];) 126.6869 Tj
0 -218.3473 Td
(0470 ) 21.8426 Tj
0 -227.8407 Td
(0471   pd[0] = size-1;) 96.1073 Tj
0 -237.334 Td
(0472   pd[1] = \(uint\)p;) 100.4758 Tj
0 -246.8274 Td
(0473   pd[2] = \(uint\)p >> 16;) 126.6869 Tj
0 -256.3207 Td
(0474 ) 21.8426 Tj
0 -265.8141 Td
(0475   asm volatile\("lidt \(%0\)" : : "r" \(pd\)\);) 200.9517 Tj
0 -275.3075 Td
(0476 }) 26.2111 Tj
0 -284.8008 Td
(0477 ) 21.8426 Tj
0 -294.2942 Td
(0478 static inline void) 100.4758 Tj
0 -303.7875 Td
(0479 ltr\(ushort sel\)) 87.3703 Tj
0 -313.2809 Td
(0480 {) 26.2111 Tj
0 -322.7743 Td
(0481   asm volatile\("ltr %0" : : "r" \(sel\)\);) 192.2146 Tj
0 -332.2676 Td
(0482 }) 26.2111 Tj
0 -341.761 Td
(0483 ) 21.8426 Tj
0 -351.2543 Td
(0484 static inline uint) 100.4758 Tj
0 -360.7477 Td
(0485 readeflags\(void\)) 91.7388 Tj
0 -370.2411 Td
(0486 {) 26.2111 Tj
0 -379.7344 Td
(0487   uint eflags;) 83.0018 Tj
0 -389.2278 Td
(0488   asm volatile\("pushfl; popl %0" : "=r" \(eflags\)\);) 240.2683 Tj
0 -398.7211 Td
(0489   return eflags;) 91.7388 Tj
0 -408.2145 Td
(0490 }) 26.2111 Tj
0 -417.7079 Td
(0491 ) 21.8426 Tj
0 -427.2012 Td
(0492 ) 21.8426 Tj
0 -436.6946 Td
(0493 ) 21.8426 Tj
0 -446.1879 Td
(0494 ) 21.8426 Tj
0 -455.6813 Td
(0495 ) 21.8426 Tj
0 -465.1747 Td
(0496 ) 21.8426 Tj
0 -474.668 Td
(0497 ) 21.8426 Tj
0 -484.1614 Td
(0498 ) 21.8426 Tj
0 -493.6547 Td
(0499 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 04) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 12 12
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/x86.h  Page 3) 157.2665 Tj
0 -28.4801 Td
(0500 static inline uint) 100.4758 Tj
0 -37.9735 Td
(0501 xchg\(volatile uint *addr, uint newval\)) 187.8461 Tj
0 -47.4668 Td
(0502 {) 26.2111 Tj
0 -56.9602 Td
(0503   uint result;) 83.0018 Tj
0 -66.4535 Td
(0504 ) 21.8426 Tj
0 -75.9469 Td
(0505   // The + in "+m" denotes a read-modify-write operand.) 262.1109 Tj
0 -85.4403 Td
(0506   asm volatile\("lock; xchgl %0, %1" :) 183.4776 Tj
0 -94.9336 Td
(0507                "+m" \(*addr\), "=a" \(result\) :) 214.0572 Tj
0 -104.427 Td
(0508                "1" \(newval\) :) 148.5295 Tj
0 -113.9203 Td
(0509                "cc"\);) 113.5814 Tj
0 -123.4137 Td
(0510   return result;) 91.7388 Tj
0 -132.9071 Td
(0511 }) 26.2111 Tj
0 -142.4004 Td
(0512 ) 21.8426 Tj
0 -151.8938 Td
(0513 static inline void) 100.4758 Tj
0 -161.3871 Td
(0514 loadfsgs\(ushort v\)) 100.4758 Tj
0 -170.8805 Td
(0515 {) 26.2111 Tj
0 -180.3739 Td
(0516   asm volatile\("movw %0, %%fs" : : "r" \(v\)\);) 214.0572 Tj
0 -189.8672 Td
(0517   asm volatile\("movw %0, %%gs" : : "r" \(v\)\);) 214.0572 Tj
0 -199.3606 Td
(0518 }) 26.2111 Tj
0 -208.8539 Td
(0519 ) 21.8426 Tj
0 -218.3473 Td
(0520 static inline void) 100.4758 Tj
0 -227.8407 Td
(0521 cli\(void\)) 61.1592 Tj
0 -237.334 Td
(0522 {) 26.2111 Tj
0 -246.8274 Td
(0523   asm volatile\("cli"\);) 117.9499 Tj
0 -256.3207 Td
(0524 }) 26.2111 Tj
0 -265.8141 Td
(0525 ) 21.8426 Tj
0 -275.3075 Td
(0526 static inline void) 100.4758 Tj
0 -284.8008 Td
(0527 sti\(void\)) 61.1592 Tj
0 -294.2942 Td
(0528 {) 26.2111 Tj
0 -303.7875 Td
(0529   asm volatile\("sti"\);) 117.9499 Tj
0 -313.2809 Td
(0530 }) 26.2111 Tj
0 -322.7743 Td
(0531 ) 21.8426 Tj
0 -332.2676 Td
(0532 ) 21.8426 Tj
0 -341.761 Td
(0533 ) 21.8426 Tj
0 -351.2543 Td
(0534 ) 21.8426 Tj
0 -360.7477 Td
(0535 ) 21.8426 Tj
0 -370.2411 Td
(0536 ) 21.8426 Tj
0 -379.7344 Td
(0537 ) 21.8426 Tj
0 -389.2278 Td
(0538 ) 21.8426 Tj
0 -398.7211 Td
(0539 ) 21.8426 Tj
0 -408.2145 Td
(0540 ) 21.8426 Tj
0 -417.7079 Td
(0541 ) 21.8426 Tj
0 -427.2012 Td
(0542 ) 21.8426 Tj
0 -436.6946 Td
(0543 ) 21.8426 Tj
0 -446.1879 Td
(0544 ) 21.8426 Tj
0 -455.6813 Td
(0545 ) 21.8426 Tj
0 -465.1747 Td
(0546 ) 21.8426 Tj
0 -474.668 Td
(0547 ) 21.8426 Tj
0 -484.1614 Td
(0548 ) 21.8426 Tj
0 -493.6547 Td
(0549 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 05) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/x86.h  Page 4) 157.2665 Tj
0 -28.4801 Td
(0550 // Layout of the trap frame built on the stack by the) 253.3738 Tj
0 -37.9735 Td
(0551 // hardware and by trapasm.S, and passed to trap\(\).) 244.6368 Tj
0 -47.4668 Td
(0552 struct trapframe {) 100.4758 Tj
0 -56.9602 Td
(0553   // registers as pushed by pusha) 166.0035 Tj
0 -66.4535 Td
(0554   uint edi;) 69.8962 Tj
0 -75.9469 Td
(0555   uint esi;) 69.8962 Tj
0 -85.4403 Td
(0556   uint ebp;) 69.8962 Tj
0 -94.9336 Td
(0557   uint oesp;      // useless & ignored) 187.8461 Tj
0 -104.427 Td
(0558   uint ebx;) 69.8962 Tj
0 -113.9203 Td
(0559   uint edx;) 69.8962 Tj
0 -123.4137 Td
(0560   uint ecx;) 69.8962 Tj
0 -132.9071 Td
(0561   uint eax;) 69.8962 Tj
0 -142.4004 Td
(0562 ) 21.8426 Tj
0 -151.8938 Td
(0563   // rest of trap frame) 122.3184 Tj
0 -161.3871 Td
(0564   ushort gs;) 74.2647 Tj
0 -170.8805 Td
(0565   ushort padding1;) 100.4758 Tj
0 -180.3739 Td
(0566   ushort fs;) 74.2647 Tj
0 -189.8672 Td
(0567   ushort padding2;) 100.4758 Tj
0 -199.3606 Td
(0568   ushort es;) 74.2647 Tj
0 -208.8539 Td
(0569   ushort padding3;) 100.4758 Tj
0 -218.3473 Td
(0570   ushort ds;) 74.2647 Tj
0 -227.8407 Td
(0571   ushort padding4;) 100.4758 Tj
0 -237.334 Td
(0572   uint trapno;) 83.0018 Tj
0 -246.8274 Td
(0573 ) 21.8426 Tj
0 -256.3207 Td
(0574   // below here defined by x86 hardware) 192.2146 Tj
0 -265.8141 Td
(0575   uint err;) 69.8962 Tj
0 -275.3075 Td
(0576   uint eip;) 69.8962 Tj
0 -284.8008 Td
(0577   ushort cs;) 74.2647 Tj
0 -294.2942 Td
(0578   ushort padding5;) 100.4758 Tj
0 -303.7875 Td
(0579   uint eflags;) 83.0018 Tj
0 -313.2809 Td
(0580 ) 21.8426 Tj
0 -322.7743 Td
(0581   // below here only when crossing rings, such as from use\
r to kernel) 323.2701 Tj
0 -332.2676 Td
(0582   uint esp;) 69.8962 Tj
0 -341.761 Td
(0583   ushort ss;) 74.2647 Tj
0 -351.2543 Td
(0584   ushort padding6;) 100.4758 Tj
0 -360.7477 Td
(0585 };) 30.5796 Tj
0 -370.2411 Td
(0586 ) 21.8426 Tj
0 -379.7344 Td
(0587 ) 21.8426 Tj
0 -389.2278 Td
(0588 ) 21.8426 Tj
0 -398.7211 Td
(0589 ) 21.8426 Tj
0 -408.2145 Td
(0590 ) 21.8426 Tj
0 -417.7079 Td
(0591 ) 21.8426 Tj
0 -427.2012 Td
(0592 ) 21.8426 Tj
0 -436.6946 Td
(0593 ) 21.8426 Tj
0 -446.1879 Td
(0594 ) 21.8426 Tj
0 -455.6813 Td
(0595 ) 21.8426 Tj
0 -465.1747 Td
(0596 ) 21.8426 Tj
0 -474.668 Td
(0597 ) 21.8426 Tj
0 -484.1614 Td
(0598 ) 21.8426 Tj
0 -493.6547 Td
(0599 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 05) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 13 13
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/asm.h  Page 1) 157.2665 Tj
0 -28.4801 Td
(0600 //) 30.5796 Tj
0 -37.9735 Td
(0601 // assembler macros to create x86 segments) 205.3202 Tj
0 -47.4668 Td
(0602 //) 30.5796 Tj
0 -56.9602 Td
(0603 ) 21.8426 Tj
0 -66.4535 Td
(0604 #define SEG_NULLASM                                       \
      \\) 305.796 Tj
0 -75.9469 Td
(0605         .word 0, 0;                                       \
      \\) 305.796 Tj
0 -85.4403 Td
(0606         .byte 0, 0, 0, 0) 126.6869 Tj
0 -94.9336 Td
(0607 ) 21.8426 Tj
0 -104.427 Td
(0608 #define SEG_ASM\(type,base,lim\)                          \
        \\) 305.796 Tj
0 -113.9203 Td
(0609         .word \(\(\(lim\) >> 12\) & 0xffff\), \(\(base\) &\
 0xffff\);      \\) 305.796 Tj
0 -123.4137 Td
(0610         .byte \(\(\(base\) >> 16\) & 0xff\), \(0x90 | \(ty\
pe\)\),         \\) 305.796 Tj
0 -132.9071 Td
(0611                 \(0xC0 | \(\(\(lim\) >> 28\) & 0xf\)\), \(\
\(\(base\) >> 24\) & 0xff\)) 332.0071 Tj
0 -142.4004 Td
(0612 ) 21.8426 Tj
0 -151.8938 Td
(0613 #define STA_X     0x8       // Executable segment) 235.8998 Tj
0 -161.3871 Td
(0614 #define STA_E     0x4       // Expand down \(non-executabl\
e segments\)) 318.9016 Tj
0 -170.8805 Td
(0615 #define STA_C     0x4       // Conforming code segment \(e\
xecutable only\)) 336.3756 Tj
0 -180.3739 Td
(0616 #define STA_W     0x2       // Writeable \(non-executable \
segments\)) 310.1645 Tj
0 -189.8672 Td
(0617 #define STA_R     0x2       // Readable \(executable segme\
nts\)) 288.322 Tj
0 -199.3606 Td
(0618 #define STA_A     0x1       // Accessed) 192.2146 Tj
0 -208.8539 Td
(0619 ) 21.8426 Tj
0 -218.3473 Td
(0620 ) 21.8426 Tj
0 -227.8407 Td
(0621 ) 21.8426 Tj
0 -237.334 Td
(0622 ) 21.8426 Tj
0 -246.8274 Td
(0623 ) 21.8426 Tj
0 -256.3207 Td
(0624 ) 21.8426 Tj
0 -265.8141 Td
(0625 ) 21.8426 Tj
0 -275.3075 Td
(0626 ) 21.8426 Tj
0 -284.8008 Td
(0627 ) 21.8426 Tj
0 -294.2942 Td
(0628 ) 21.8426 Tj
0 -303.7875 Td
(0629 ) 21.8426 Tj
0 -313.2809 Td
(0630 ) 21.8426 Tj
0 -322.7743 Td
(0631 ) 21.8426 Tj
0 -332.2676 Td
(0632 ) 21.8426 Tj
0 -341.761 Td
(0633 ) 21.8426 Tj
0 -351.2543 Td
(0634 ) 21.8426 Tj
0 -360.7477 Td
(0635 ) 21.8426 Tj
0 -370.2411 Td
(0636 ) 21.8426 Tj
0 -379.7344 Td
(0637 ) 21.8426 Tj
0 -389.2278 Td
(0638 ) 21.8426 Tj
0 -398.7211 Td
(0639 ) 21.8426 Tj
0 -408.2145 Td
(0640 ) 21.8426 Tj
0 -417.7079 Td
(0641 ) 21.8426 Tj
0 -427.2012 Td
(0642 ) 21.8426 Tj
0 -436.6946 Td
(0643 ) 21.8426 Tj
0 -446.1879 Td
(0644 ) 21.8426 Tj
0 -455.6813 Td
(0645 ) 21.8426 Tj
0 -465.1747 Td
(0646 ) 21.8426 Tj
0 -474.668 Td
(0647 ) 21.8426 Tj
0 -484.1614 Td
(0648 ) 21.8426 Tj
0 -493.6547 Td
(0649 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 06) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/mmu.h  Page 1) 157.2665 Tj
0 -28.4801 Td
(0650 // This file contains definitions for the) 200.9517 Tj
0 -37.9735 Td
(0651 // x86 memory management unit \(MMU\).) 179.1091 Tj
0 -47.4668 Td
(0652 ) 21.8426 Tj
0 -56.9602 Td
(0653 // Eflags register) 100.4758 Tj
0 -66.4535 Td
(0654 #define FL_CF           0x00000001      // Carry Flag) 253.3738 Tj
0 -75.9469 Td
(0655 #define FL_PF           0x00000004      // Parity Flag) 257.7424 Tj
0 -85.4403 Td
(0656 #define FL_AF           0x00000010      // Auxiliary carry\
 Flag) 297.059 Tj
0 -94.9336 Td
(0657 #define FL_ZF           0x00000040      // Zero Flag) 249.0053 Tj
0 -104.427 Td
(0658 #define FL_SF           0x00000080      // Sign Flag) 249.0053 Tj
0 -113.9203 Td
(0659 #define FL_TF           0x00000100      // Trap Flag) 249.0053 Tj
0 -123.4137 Td
(0660 #define FL_IF           0x00000200      // Interrupt Enabl\
e) 279.5849 Tj
0 -132.9071 Td
(0661 #define FL_DF           0x00000400      // Direction Flag) 270.8479 Tj
0 -142.4004 Td
(0662 #define FL_OF           0x00000800      // Overflow Flag) 266.4794 Tj
0 -151.8938 Td
(0663 #define FL_IOPL_MASK    0x00003000      // I/O Privilege L\
evel bitmask) 327.6386 Tj
0 -161.3871 Td
(0664 #define FL_IOPL_0       0x00000000      //   IOPL == 0) 257.7424 Tj
0 -170.8805 Td
(0665 #define FL_IOPL_1       0x00001000      //   IOPL == 1) 257.7424 Tj
0 -180.3739 Td
(0666 #define FL_IOPL_2       0x00002000      //   IOPL == 2) 257.7424 Tj
0 -189.8672 Td
(0667 #define FL_IOPL_3       0x00003000      //   IOPL == 3) 257.7424 Tj
0 -199.3606 Td
(0668 #define FL_NT           0x00004000      // Nested Task) 257.7424 Tj
0 -208.8539 Td
(0669 #define FL_RF           0x00010000      // Resume Flag) 257.7424 Tj
0 -218.3473 Td
(0670 #define FL_VM           0x00020000      // Virtual 8086 mo\
de) 283.9534 Tj
0 -227.8407 Td
(0671 #define FL_AC           0x00040000      // Alignment Check) 275.2164 Tj
0 -237.334 Td
(0672 #define FL_VIF          0x00080000      // Virtual Interru\
pt Flag) 305.796 Tj
0 -246.8274 Td
(0673 #define FL_VIP          0x00100000      // Virtual Interru\
pt Pending) 318.9016 Tj
0 -256.3207 Td
(0674 #define FL_ID           0x00200000      // ID flag) 240.2683 Tj
0 -265.8141 Td
(0675 ) 21.8426 Tj
0 -275.3075 Td
(0676 // Segment Descriptor) 113.5814 Tj
0 -284.8008 Td
(0677 struct segdesc {) 91.7388 Tj
0 -294.2942 Td
(0678   uint lim_15_0 : 16;  // Low bits of segment limit) 244.6368 Tj
0 -303.7875 Td
(0679   uint base_15_0 : 16; // Low bits of segment base address) 275.2164 Tj
0 -313.2809 Td
(0680   uint base_23_16 : 8; // Middle bits of segment base addr\
ess) 288.322 Tj
0 -322.7743 Td
(0681   uint type : 4;       // Segment type \(see STS_ constant\
s\)) 279.5849 Tj
0 -332.2676 Td
(0682   uint s : 1;          // 0 = system, 1 = application) 253.3738 Tj
0 -341.761 Td
(0683   uint dpl : 2;        // Descriptor Privilege Level) 249.0053 Tj
0 -351.2543 Td
(0684   uint p : 1;          // Present) 166.0035 Tj
0 -360.7477 Td
(0685   uint lim_19_16 : 4;  // High bits of segment limit) 249.0053 Tj
0 -370.2411 Td
(0686   uint avl : 1;        // Unused \(available for software \
use\)) 288.322 Tj
0 -379.7344 Td
(0687   uint rsv1 : 1;       // Reserved) 170.3721 Tj
0 -389.2278 Td
(0688   uint db : 1;         // 0 = 16-bit segment, 1 = 32-bit s\
egment) 301.4275 Tj
0 -398.7211 Td
(0689   uint g : 1;          // Granularity: limit scaled by 4K \
when set) 310.1645 Tj
0 -408.2145 Td
(0690   uint base_31_24 : 8; // High bits of segment base addres\
s) 279.5849 Tj
0 -417.7079 Td
(0691 };) 30.5796 Tj
0 -427.2012 Td
(0692 ) 21.8426 Tj
0 -436.6946 Td
(0693 ) 21.8426 Tj
0 -446.1879 Td
(0694 ) 21.8426 Tj
0 -455.6813 Td
(0695 ) 21.8426 Tj
0 -465.1747 Td
(0696 ) 21.8426 Tj
0 -474.668 Td
(0697 ) 21.8426 Tj
0 -484.1614 Td
(0698 ) 21.8426 Tj
0 -493.6547 Td
(0699 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 06) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 14 14
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/mmu.h  Page 2) 157.2665 Tj
0 -28.4801 Td
(0700 // Normal segment) 96.1073 Tj
0 -37.9735 Td
(0701 #define SEG\(type, base, lim, dpl\) \(struct segdesc\)    \
                  \\) 340.7441 Tj
0 -47.4668 Td
(0702 { \(\(lim\) >> 12\) & 0xffff, \(base\) & 0xffff, \(\(base\)\
 >> 16\) & 0xff,       \\) 340.7441 Tj
0 -56.9602 Td
(0703     type, 1, dpl, 1, \(uint\) \(lim\) >> 28, 0, 0, 1, 1,  \
                  \\) 340.7441 Tj
0 -66.4535 Td
(0704     \(uint\) \(base\) >> 24 }) 131.0554 Tj
0 -75.9469 Td
(0705 ) 21.8426 Tj
0 -85.4403 Td
(0706 #define SEG16\(type, base, lim, dpl\) \(struct segdesc\)  \
                  \\) 340.7441 Tj
0 -94.9336 Td
(0707 { \(lim\) & 0xffff, \(base\) & 0xffff, \(\(base\) >> 16\) \
& 0xff,               \\) 340.7441 Tj
0 -104.427 Td
(0708     type, 1, dpl, 1, \(uint\) \(lim\) >> 16, 0, 0, 1, 0,  \
                  \\) 340.7441 Tj
0 -113.9203 Td
(0709     \(uint\) \(base\) >> 24 }) 131.0554 Tj
0 -123.4137 Td
(0710 ) 21.8426 Tj
0 -132.9071 Td
(0711 #define DPL_USER    0x3     // User DPL) 192.2146 Tj
0 -142.4004 Td
(0712 ) 21.8426 Tj
0 -151.8938 Td
(0713 // Application segment type bits) 161.635 Tj
0 -161.3871 Td
(0714 #define STA_X       0x8     // Executable segment) 235.8998 Tj
0 -170.8805 Td
(0715 #define STA_E       0x4     // Expand down \(non-executabl\
e segments\)) 318.9016 Tj
0 -180.3739 Td
(0716 #define STA_C       0x4     // Conforming code segment \(e\
xecutable only\)) 336.3756 Tj
0 -189.8672 Td
(0717 #define STA_W       0x2     // Writeable \(non-executable \
segments\)) 310.1645 Tj
0 -199.3606 Td
(0718 #define STA_R       0x2     // Readable \(executable segme\
nts\)) 288.322 Tj
0 -208.8539 Td
(0719 #define STA_A       0x1     // Accessed) 192.2146 Tj
0 -218.3473 Td
(0720 ) 21.8426 Tj
0 -227.8407 Td
(0721 // System segment type bits) 139.7925 Tj
0 -237.334 Td
(0722 #define STS_T16A    0x1     // Available 16-bit TSS) 244.6368 Tj
0 -246.8274 Td
(0723 #define STS_LDT     0x2     // Local Descriptor Table) 253.3738 Tj
0 -256.3207 Td
(0724 #define STS_T16B    0x3     // Busy 16-bit TSS) 222.7942 Tj
0 -265.8141 Td
(0725 #define STS_CG16    0x4     // 16-bit Call Gate) 227.1628 Tj
0 -275.3075 Td
(0726 #define STS_TG      0x5     // Task Gate / Coum Transmitio\
ns) 283.9534 Tj
0 -284.8008 Td
(0727 #define STS_IG16    0x6     // 16-bit Interrupt Gate) 249.0053 Tj
0 -294.2942 Td
(0728 #define STS_TG16    0x7     // 16-bit Trap Gate) 227.1628 Tj
0 -303.7875 Td
(0729 #define STS_T32A    0x9     // Available 32-bit TSS) 244.6368 Tj
0 -313.2809 Td
(0730 #define STS_T32B    0xB     // Busy 32-bit TSS) 222.7942 Tj
0 -322.7743 Td
(0731 #define STS_CG32    0xC     // 32-bit Call Gate) 227.1628 Tj
0 -332.2676 Td
(0732 #define STS_IG32    0xE     // 32-bit Interrupt Gate) 249.0053 Tj
0 -341.761 Td
(0733 #define STS_TG32    0xF     // 32-bit Trap Gate) 227.1628 Tj
0 -351.2543 Td
(0734 ) 21.8426 Tj
0 -360.7477 Td
(0735 ) 21.8426 Tj
0 -370.2411 Td
(0736 ) 21.8426 Tj
0 -379.7344 Td
(0737 ) 21.8426 Tj
0 -389.2278 Td
(0738 ) 21.8426 Tj
0 -398.7211 Td
(0739 ) 21.8426 Tj
0 -408.2145 Td
(0740 ) 21.8426 Tj
0 -417.7079 Td
(0741 ) 21.8426 Tj
0 -427.2012 Td
(0742 ) 21.8426 Tj
0 -436.6946 Td
(0743 ) 21.8426 Tj
0 -446.1879 Td
(0744 ) 21.8426 Tj
0 -455.6813 Td
(0745 ) 21.8426 Tj
0 -465.1747 Td
(0746 ) 21.8426 Tj
0 -474.668 Td
(0747 ) 21.8426 Tj
0 -484.1614 Td
(0748 ) 21.8426 Tj
0 -493.6547 Td
(0749 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 07) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/mmu.h  Page 3) 157.2665 Tj
0 -28.4801 Td
(0750 // Task state segment format) 144.161 Tj
0 -37.9735 Td
(0751 struct taskstate {) 100.4758 Tj
0 -47.4668 Td
(0752   uint link;         // Old ts selector) 192.2146 Tj
0 -56.9602 Td
(0753   uint esp0;         // Stack pointers and segment selecto\
rs) 283.9534 Tj
0 -66.4535 Td
(0754   ushort ss0;        //   after an increase in privilege l\
evel) 292.6905 Tj
0 -75.9469 Td
(0755   ushort padding1;) 100.4758 Tj
0 -85.4403 Td
(0756   uint *esp1;) 78.6333 Tj
0 -94.9336 Td
(0757   ushort ss1;) 78.6333 Tj
0 -104.427 Td
(0758   ushort padding2;) 100.4758 Tj
0 -113.9203 Td
(0759   uint *esp2;) 78.6333 Tj
0 -123.4137 Td
(0760   ushort ss2;) 78.6333 Tj
0 -132.9071 Td
(0761   ushort padding3;) 100.4758 Tj
0 -142.4004 Td
(0762   void *cr3;         // Page directory base) 209.6887 Tj
0 -151.8938 Td
(0763   uint *eip;         // Saved state from last task switch) 270.8479 Tj
0 -161.3871 Td
(0764   uint eflags;) 83.0018 Tj
0 -170.8805 Td
(0765   uint eax;          // More saved state \(registers\)) 249.0053 Tj
0 -180.3739 Td
(0766   uint ecx;) 69.8962 Tj
0 -189.8672 Td
(0767   uint edx;) 69.8962 Tj
0 -199.3606 Td
(0768   uint ebx;) 69.8962 Tj
0 -208.8539 Td
(0769   uint *esp;) 74.2647 Tj
0 -218.3473 Td
(0770   uint *ebp;) 74.2647 Tj
0 -227.8407 Td
(0771   uint esi;) 69.8962 Tj
0 -237.334 Td
(0772   uint edi;) 69.8962 Tj
0 -246.8274 Td
(0773   ushort es;         // Even more saved state \(segment se\
lectors\)) 305.796 Tj
0 -256.3207 Td
(0774   ushort padding4;) 100.4758 Tj
0 -265.8141 Td
(0775   ushort cs;) 74.2647 Tj
0 -275.3075 Td
(0776   ushort padding5;) 100.4758 Tj
0 -284.8008 Td
(0777   ushort ss;) 74.2647 Tj
0 -294.2942 Td
(0778   ushort padding6;) 100.4758 Tj
0 -303.7875 Td
(0779   ushort ds;) 74.2647 Tj
0 -313.2809 Td
(0780   ushort padding7;) 100.4758 Tj
0 -322.7743 Td
(0781   ushort fs;) 74.2647 Tj
0 -332.2676 Td
(0782   ushort padding8;) 100.4758 Tj
0 -341.761 Td
(0783   ushort gs;) 74.2647 Tj
0 -351.2543 Td
(0784   ushort padding9;) 100.4758 Tj
0 -360.7477 Td
(0785   ushort ldt;) 78.6333 Tj
0 -370.2411 Td
(0786   ushort padding10;) 104.8443 Tj
0 -379.7344 Td
(0787   ushort t;          // Trap on task switch) 209.6887 Tj
0 -389.2278 Td
(0788   ushort iomb;       // I/O map base address) 214.0572 Tj
0 -398.7211 Td
(0789 };) 30.5796 Tj
0 -408.2145 Td
(0790 ) 21.8426 Tj
0 -417.7079 Td
(0791 ) 21.8426 Tj
0 -427.2012 Td
(0792 ) 21.8426 Tj
0 -436.6946 Td
(0793 ) 21.8426 Tj
0 -446.1879 Td
(0794 ) 21.8426 Tj
0 -455.6813 Td
(0795 ) 21.8426 Tj
0 -465.1747 Td
(0796 ) 21.8426 Tj
0 -474.668 Td
(0797 ) 21.8426 Tj
0 -484.1614 Td
(0798 ) 21.8426 Tj
0 -493.6547 Td
(0799 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 07) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 15 15
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/mmu.h  Page 4) 157.2665 Tj
0 -28.4801 Td
(0800 // Gate descriptors for interrupts and traps) 214.0572 Tj
0 -37.9735 Td
(0801 struct gatedesc {) 96.1073 Tj
0 -47.4668 Td
(0802   uint off_15_0 : 16;   // low 16 bits of offset in segmen\
t) 279.5849 Tj
0 -56.9602 Td
(0803   uint cs : 16;         // code segment selector) 231.5313 Tj
0 -66.4535 Td
(0804   uint args : 5;        // # args, 0 for interrupt/trap ga\
tes) 288.322 Tj
0 -75.9469 Td
(0805   uint rsv1 : 3;        // reserved\(should be zero I gues\
s\)) 279.5849 Tj
0 -85.4403 Td
(0806   uint type : 4;        // type\(STS_{TG,IG32,TG32}\)) 244.6368 Tj
0 -94.9336 Td
(0807   uint s : 1;           // must be 0 \(system\)) 218.4257 Tj
0 -104.427 Td
(0808   uint dpl : 2;         // descriptor\(meaning new\) privi\
lege level) 310.1645 Tj
0 -113.9203 Td
(0809   uint p : 1;           // Present) 170.3721 Tj
0 -123.4137 Td
(0810   uint off_31_16 : 16;  // high bits of offset in segment) 270.8479 Tj
0 -132.9071 Td
(0811 };) 30.5796 Tj
0 -142.4004 Td
(0812 ) 21.8426 Tj
0 -151.8938 Td
(0813 // Set up a normal interrupt/trap gate descriptor.) 240.2683 Tj
0 -161.3871 Td
(0814 // - istrap: 1 for a trap \(= exception\) gate, 0 for an i\
nterrupt gate.) 327.6386 Tj
0 -170.8805 Td
(0815 //   interrupt gate clears FL_IF, trap gate leaves FL_IF a\
lone) 292.6905 Tj
0 -180.3739 Td
(0816 // - sel: Code segment selector for interrupt/trap handler) 275.2164 Tj
0 -189.8672 Td
(0817 // - off: Offset in code segment for interrupt/trap handle\
r) 279.5849 Tj
0 -199.3606 Td
(0818 // - dpl: Descriptor Privilege Level -) 187.8461 Tj
0 -208.8539 Td
(0819 //        the privilege level required for software to inv\
oke) 288.322 Tj
0 -218.3473 Td
(0820 //        this interrupt/trap gate explicitly using an int\
 instruction.) 332.0071 Tj
0 -227.8407 Td
(0821 #define SETGATE\(gate, istrap, sel, off, d\)              \
  \\) 279.5849 Tj
0 -237.334 Td
(0822 {                                                         \
\\) 279.5849 Tj
0 -246.8274 Td
(0823   \(gate\).off_15_0 = \(uint\) \(off\) & 0xffff;          \
      \\) 279.5849 Tj
0 -256.3207 Td
(0824   \(gate\).cs = \(sel\);                                  \
    \\) 279.5849 Tj
0 -265.8141 Td
(0825   \(gate\).args = 0;                                      \
  \\) 279.5849 Tj
0 -275.3075 Td
(0826   \(gate\).rsv1 = 0;                                      \
  \\) 279.5849 Tj
0 -284.8008 Td
(0827   \(gate\).type = \(istrap\) ? STS_TG32 : STS_IG32;       \
    \\) 279.5849 Tj
0 -294.2942 Td
(0828   \(gate\).s = 0;                                         \
  \\) 279.5849 Tj
0 -303.7875 Td
(0829   \(gate\).dpl = \(d\);                                   \
    \\) 279.5849 Tj
0 -313.2809 Td
(0830   \(gate\).p = 1;                                         \
  \\) 279.5849 Tj
0 -322.7743 Td
(0831   \(gate\).off_31_16 = \(uint\) \(off\) >> 16;            \
      \\) 279.5849 Tj
0 -332.2676 Td
(0832 }) 26.2111 Tj
0 -341.761 Td
(0833 ) 21.8426 Tj
0 -351.2543 Td
(0834 ) 21.8426 Tj
0 -360.7477 Td
(0835 ) 21.8426 Tj
0 -370.2411 Td
(0836 ) 21.8426 Tj
0 -379.7344 Td
(0837 ) 21.8426 Tj
0 -389.2278 Td
(0838 ) 21.8426 Tj
0 -398.7211 Td
(0839 ) 21.8426 Tj
0 -408.2145 Td
(0840 ) 21.8426 Tj
0 -417.7079 Td
(0841 ) 21.8426 Tj
0 -427.2012 Td
(0842 ) 21.8426 Tj
0 -436.6946 Td
(0843 ) 21.8426 Tj
0 -446.1879 Td
(0844 ) 21.8426 Tj
0 -455.6813 Td
(0845 ) 21.8426 Tj
0 -465.1747 Td
(0846 ) 21.8426 Tj
0 -474.668 Td
(0847 ) 21.8426 Tj
0 -484.1614 Td
(0848 ) 21.8426 Tj
0 -493.6547 Td
(0849 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 08) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/elf.h  Page 1) 157.2665 Tj
0 -28.4801 Td
(0850 // Format of an ELF executable file) 174.7406 Tj
0 -37.9735 Td
(0851 ) 21.8426 Tj
0 -47.4668 Td
(0852 #define ELF_MAGIC 0x464C457FU  // "\\x7FELF" in little end\
ian) 283.9534 Tj
0 -56.9602 Td
(0853 ) 21.8426 Tj
0 -66.4535 Td
(0854 // File header) 83.0018 Tj
0 -75.9469 Td
(0855 struct elfhdr {) 87.3703 Tj
0 -85.4403 Td
(0856   uint magic;  // must equal ELF_MAGIC) 187.8461 Tj
0 -94.9336 Td
(0857   uchar elf[12];) 91.7388 Tj
0 -104.427 Td
(0858   ushort type;) 83.0018 Tj
0 -113.9203 Td
(0859   ushort machine;) 96.1073 Tj
0 -123.4137 Td
(0860   uint version;) 87.3703 Tj
0 -132.9071 Td
(0861   uint entry;) 78.6333 Tj
0 -142.4004 Td
(0862   uint phoff;) 78.6333 Tj
0 -151.8938 Td
(0863   uint shoff;) 78.6333 Tj
0 -161.3871 Td
(0864   uint flags;) 78.6333 Tj
0 -170.8805 Td
(0865   ushort ehsize;) 91.7388 Tj
0 -180.3739 Td
(0866   ushort phentsize;) 104.8443 Tj
0 -189.8672 Td
(0867   ushort phnum;) 87.3703 Tj
0 -199.3606 Td
(0868   ushort shentsize;) 104.8443 Tj
0 -208.8539 Td
(0869   ushort shnum;) 87.3703 Tj
0 -218.3473 Td
(0870   ushort shstrndx;) 100.4758 Tj
0 -227.8407 Td
(0871 };) 30.5796 Tj
0 -237.334 Td
(0872 ) 21.8426 Tj
0 -246.8274 Td
(0873 // Program section header) 131.0554 Tj
0 -256.3207 Td
(0874 struct proghdr {) 91.7388 Tj
0 -265.8141 Td
(0875   uint type;) 74.2647 Tj
0 -275.3075 Td
(0876   uint offset;) 83.0018 Tj
0 -284.8008 Td
(0877   uint va;) 65.5277 Tj
0 -294.2942 Td
(0878   uint pa;) 65.5277 Tj
0 -303.7875 Td
(0879   uint filesz;) 83.0018 Tj
0 -313.2809 Td
(0880   uint memsz;) 78.6333 Tj
0 -322.7743 Td
(0881   uint flags;) 78.6333 Tj
0 -332.2676 Td
(0882   uint align;) 78.6333 Tj
0 -341.761 Td
(0883 };) 30.5796 Tj
0 -351.2543 Td
(0884 ) 21.8426 Tj
0 -360.7477 Td
(0885 // Values for Proghdr type) 135.4239 Tj
0 -370.2411 Td
(0886 #define ELF_PROG_LOAD           1) 166.0035 Tj
0 -379.7344 Td
(0887 ) 21.8426 Tj
0 -389.2278 Td
(0888 // Flag bits for Proghdr flags) 152.898 Tj
0 -398.7211 Td
(0889 #define ELF_PROG_FLAG_EXEC      1) 166.0035 Tj
0 -408.2145 Td
(0890 #define ELF_PROG_FLAG_WRITE     2) 166.0035 Tj
0 -417.7079 Td
(0891 #define ELF_PROG_FLAG_READ      4) 166.0035 Tj
0 -427.2012 Td
(0892 ) 21.8426 Tj
0 -436.6946 Td
(0893 ) 21.8426 Tj
0 -446.1879 Td
(0894 ) 21.8426 Tj
0 -455.6813 Td
(0895 ) 21.8426 Tj
0 -465.1747 Td
(0896 ) 21.8426 Tj
0 -474.668 Td
(0897 ) 21.8426 Tj
0 -484.1614 Td
(0898 ) 21.8426 Tj
0 -493.6547 Td
(0899 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 08) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 16 16
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/bootasm.S  Page 1) 174.7406 Tj
0 -28.4801 Td
(0900 #include "asm.h") 91.7388 Tj
0 -37.9735 Td
(0901 ) 21.8426 Tj
0 -47.4668 Td
(0902 # Start the first CPU: switch to 32-bit protected mode, ju\
mp into C.) 318.9016 Tj
0 -56.9602 Td
(0903 # The BIOS loads this code from the first sector of the ha\
rd disk into) 327.6386 Tj
0 -66.4535 Td
(0904 # memory at physical address 0x7c00 and starts executing i\
n real mode) 323.2701 Tj
0 -75.9469 Td
(0905 # with %cs=0 %ip=7c00.) 117.9499 Tj
0 -85.4403 Td
(0906 ) 21.8426 Tj
0 -94.9336 Td
(0907 #define SEG_KCODE 1  // kernel code) 174.7406 Tj
0 -104.427 Td
(0908 #define SEG_KDATA 2  // kernel data+stack) 200.9517 Tj
0 -113.9203 Td
(0909 ) 21.8426 Tj
0 -123.4137 Td
(0910 #define CR0_PE    1  // protected mode enable bit) 235.8998 Tj
0 -132.9071 Td
(0911 ) 21.8426 Tj
0 -142.4004 Td
(0912 .code16                       # Assemble for 16-bit mode) 266.4794 Tj
0 -151.8938 Td
(0913 .globl start) 74.2647 Tj
0 -161.3871 Td
(0914 start:) 48.0537 Tj
0 -170.8805 Td
(0915   cli                         # Disable interrupts) 240.2683 Tj
0 -180.3739 Td
(0916 ) 21.8426 Tj
0 -189.8672 Td
(0917   # Set up the important data segment registers \(DS, ES, \
SS\).) 288.322 Tj
0 -199.3606 Td
(0918   xorw    %ax,%ax             # Segment number zero) 244.6368 Tj
0 -208.8539 Td
(0919   movw    %ax,%ds             # -> Data Segment) 227.1628 Tj
0 -218.3473 Td
(0920   movw    %ax,%es             # -> Extra Segment) 231.5313 Tj
0 -227.8407 Td
(0921   movw    %ax,%ss             # -> Stack Segment) 231.5313 Tj
0 -237.334 Td
(0922 ) 21.8426 Tj
0 -246.8274 Td
(0923   # Enable A20:) 87.3703 Tj
0 -256.3207 Td
(0924   #   For backwards compatibility with the earliest PCs, p\
hysical) 305.796 Tj
0 -265.8141 Td
(0925   #   address line 20 is tied low, so that addresses highe\
r than) 301.4275 Tj
0 -275.3075 Td
(0926   #   1MB wrap around to zero by default.  This code undoe\
s this.) 305.796 Tj
0 -284.8008 Td
(0927 seta20.1:) 61.1592 Tj
0 -294.2942 Td
(0928   inb     $0x64,%al               # Wait for not busy) 253.3738 Tj
0 -303.7875 Td
(0929   testb   $0x2,%al) 100.4758 Tj
0 -313.2809 Td
(0930   jnz     seta20.1) 100.4758 Tj
0 -322.7743 Td
(0931 ) 21.8426 Tj
0 -332.2676 Td
(0932   movb    $0xd1,%al               # 0xd1 -> port 0x64) 253.3738 Tj
0 -341.761 Td
(0933   outb    %al,$0x64) 104.8443 Tj
0 -351.2543 Td
(0934 ) 21.8426 Tj
0 -360.7477 Td
(0935 seta20.2:) 61.1592 Tj
0 -370.2411 Td
(0936   inb     $0x64,%al               # Wait for not busy) 253.3738 Tj
0 -379.7344 Td
(0937   testb   $0x2,%al) 100.4758 Tj
0 -389.2278 Td
(0938   jnz     seta20.2) 100.4758 Tj
0 -398.7211 Td
(0939 ) 21.8426 Tj
0 -408.2145 Td
(0940   movb    $0xdf,%al               # 0xdf -> port 0x60) 253.3738 Tj
0 -417.7079 Td
(0941   outb    %al,$0x60) 104.8443 Tj
0 -427.2012 Td
(0942 ) 21.8426 Tj
0 -436.6946 Td
(0943 ) 21.8426 Tj
0 -446.1879 Td
(0944 ) 21.8426 Tj
0 -455.6813 Td
(0945 ) 21.8426 Tj
0 -465.1747 Td
(0946 ) 21.8426 Tj
0 -474.668 Td
(0947 ) 21.8426 Tj
0 -484.1614 Td
(0948 ) 21.8426 Tj
0 -493.6547 Td
(0949 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 09) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/bootasm.S  Page 2) 174.7406 Tj
0 -28.4801 Td
(0950   # Switch from real to protected mode, using a bootstrap \
GDT) 288.322 Tj
0 -37.9735 Td
(0951   # and segment translation that makes virtual addresses) 266.4794 Tj
0 -47.4668 Td
(0952   # identical to physical addresses, so that the) 231.5313 Tj
0 -56.9602 Td
(0953   # effective memory map does not change during the switch\
.) 279.5849 Tj
0 -66.4535 Td
(0954   lgdt    gdtdesc) 96.1073 Tj
0 -75.9469 Td
(0955   movl    %cr0, %eax) 109.2129 Tj
0 -85.4403 Td
(0956   orl     $CR0_PE, %eax) 122.3184 Tj
0 -94.9336 Td
(0957   movl    %eax, %cr0) 109.2129 Tj
0 -104.427 Td
(0958 ) 21.8426 Tj
0 -113.9203 Td
(0959   # Jump to next instruction, but in 32-bit code segment.) 270.8479 Tj
0 -123.4137 Td
(0960   # Switches processor into 32-bit mode.) 196.5831 Tj
0 -132.9071 Td
(0961   ljmp    $\(SEG_KCODE<<3\), $start32) 174.7406 Tj
0 -142.4004 Td
(0962 ) 21.8426 Tj
0 -151.8938 Td
(0963 .code32                       # Assemble for 32-bit mode) 266.4794 Tj
0 -161.3871 Td
(0964 start32:) 56.7907 Tj
0 -170.8805 Td
(0965   # Set up the protected-mode data segment registers) 249.0053 Tj
0 -180.3739 Td
(0966   movw    $\(SEG_KDATA<<3\), %ax    # Our data segment sel\
ector) 288.322 Tj
0 -189.8672 Td
(0967   movw    %ax, %ds                # -> DS: Data Segment) 262.1109 Tj
0 -199.3606 Td
(0968   movw    %ax, %es                # -> ES: Extra Segment) 266.4794 Tj
0 -208.8539 Td
(0969   movw    %ax, %ss                # -> SS: Stack Segment) 266.4794 Tj
0 -218.3473 Td
(0970   movw    $0, %ax                 # Zero segments not read\
y for use) 314.533 Tj
0 -227.8407 Td
(0971   movw    %ax, %fs                # -> FS) 200.9517 Tj
0 -237.334 Td
(0972   movw    %ax, %gs                # -> GS) 200.9517 Tj
0 -246.8274 Td
(0973 ) 21.8426 Tj
0 -256.3207 Td
(0974   # Set up the stack pointer and call into C.) 218.4257 Tj
0 -265.8141 Td
(0975   movl    $start, %esp) 117.9499 Tj
0 -275.3075 Td
(0976   call    bootmain) 100.4758 Tj
0 -284.8008 Td
(0977 ) 21.8426 Tj
0 -294.2942 Td
(0978   # If bootmain returns \(it shouldn't\), trigger a Bochs) 262.1109 Tj
0 -303.7875 Td
(0979   # breakpoint if running under Bochs, then loop.) 235.8998 Tj
0 -313.2809 Td
(0980   movw    $0x8a00, %ax            # 0x8a00 -> port 0x8a00) 270.8479 Tj
0 -322.7743 Td
(0981   movw    %ax, %dx) 100.4758 Tj
0 -332.2676 Td
(0982   outw    %ax, %dx) 100.4758 Tj
0 -341.761 Td
(0983   movw    $0x8e00, %ax            # 0x8e00 -> port 0x8a00) 270.8479 Tj
0 -351.2543 Td
(0984   outw    %ax, %dx) 100.4758 Tj
0 -360.7477 Td
(0985 spin:) 43.6851 Tj
0 -370.2411 Td
(0986   jmp     spin) 83.0018 Tj
0 -379.7344 Td
(0987 ) 21.8426 Tj
0 -389.2278 Td
(0988 # Bootstrap GDT) 87.3703 Tj
0 -398.7211 Td
(0989 .p2align 2                                # force 4 byte a\
lignment) 310.1645 Tj
0 -408.2145 Td
(0990 gdt:) 39.3166 Tj
0 -417.7079 Td
(0991   SEG_NULLASM                             # null seg) 249.0053 Tj
0 -427.2012 Td
(0992   SEG_ASM\(STA_X|STA_R, 0x0, 0xffffffff\)   # code seg) 249.0053 Tj
0 -436.6946 Td
(0993   SEG_ASM\(STA_W, 0x0, 0xffffffff\)         # data seg) 249.0053 Tj
0 -446.1879 Td
(0994 ) 21.8426 Tj
0 -455.6813 Td
(0995 gdtdesc:) 56.7907 Tj
0 -465.1747 Td
(0996   .word   \(gdtdesc - gdt - 1\)                           \
 # sizeof\(gdt\) - 1) 345.1126 Tj
0 -474.668 Td
(0997   .long   gdt                             # address gdt) 262.1109 Tj
0 -484.1614 Td
(0998 ) 21.8426 Tj
0 -493.6547 Td
(0999 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 09) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 17 17
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/bootother.S  Page 1) 183.4776 Tj
0 -28.4801 Td
(1000 #include "asm.h") 91.7388 Tj
0 -37.9735 Td
(1001 ) 21.8426 Tj
0 -47.4668 Td
(1002 # Each non-boot CPU \("AP"\) is started up in response to \
a STARTUP) 305.796 Tj
0 -56.9602 Td
(1003 # IPI from the boot CPU.  Section B.4.2 of the Multi-Proce\
ssor) 292.6905 Tj
0 -66.4535 Td
(1004 # Specification says that the AP will start in real mode w\
ith CS:IP) 314.533 Tj
0 -75.9469 Td
(1005 # set to XY00:0000, where XY is an 8-bit value sent with t\
he) 283.9534 Tj
0 -85.4403 Td
(1006 # STARTUP. Thus this code must start at a 4096-byte bounda\
ry.) 288.322 Tj
0 -94.9336 Td
(1007 #) 26.2111 Tj
0 -104.427 Td
(1008 # Because this code sets DS to zero, it must sit) 231.5313 Tj
0 -113.9203 Td
(1009 # at an address in the low 2^16 bytes.) 187.8461 Tj
0 -123.4137 Td
(1010 #) 26.2111 Tj
0 -132.9071 Td
(1011 # Bootothers \(in main.c\) sends the STARTUPs, one at a ti\
me.) 279.5849 Tj
0 -142.4004 Td
(1012 # It puts this code \(start\) at 0x7000.) 187.8461 Tj
0 -151.8938 Td
(1013 # It puts the correct %esp in start-4,) 187.8461 Tj
0 -161.3871 Td
(1014 # and the place to jump to in start-8.) 187.8461 Tj
0 -170.8805 Td
(1015 #) 26.2111 Tj
0 -180.3739 Td
(1016 # This code is identical to bootasm.S except:) 218.4257 Tj
0 -189.8672 Td
(1017 #   - it does not need to enable A20) 179.1091 Tj
0 -199.3606 Td
(1018 #   - it uses the address at start-4 for the %esp) 235.8998 Tj
0 -208.8539 Td
(1019 #   - it jumps to the address at start-8 instead of callin\
g bootmain) 318.9016 Tj
0 -218.3473 Td
(1020 ) 21.8426 Tj
0 -227.8407 Td
(1021 #define SEG_KCODE 1  // kernel code) 174.7406 Tj
0 -237.334 Td
(1022 #define SEG_KDATA 2  // kernel data+stack) 200.9517 Tj
0 -246.8274 Td
(1023 ) 21.8426 Tj
0 -256.3207 Td
(1024 #define CR0_PE    1  // protected mode enable bit) 235.8998 Tj
0 -265.8141 Td
(1025 ) 21.8426 Tj
0 -275.3075 Td
(1026 .code16                       # Assemble for 16-bit mode) 266.4794 Tj
0 -284.8008 Td
(1027 .globl start) 74.2647 Tj
0 -294.2942 Td
(1028 start:) 48.0537 Tj
0 -303.7875 Td
(1029   cli                         # Disable interrupts) 240.2683 Tj
0 -313.2809 Td
(1030 ) 21.8426 Tj
0 -322.7743 Td
(1031   # Set up the important data segment registers \(DS, ES, \
SS\).) 288.322 Tj
0 -332.2676 Td
(1032   xorw    %ax,%ax             # Segment number zero) 244.6368 Tj
0 -341.761 Td
(1033   movw    %ax,%ds             # -> Data Segment) 227.1628 Tj
0 -351.2543 Td
(1034   movw    %ax,%es             # -> Extra Segment) 231.5313 Tj
0 -360.7477 Td
(1035   movw    %ax,%ss             # -> Stack Segment) 231.5313 Tj
0 -370.2411 Td
(1036 ) 21.8426 Tj
0 -379.7344 Td
(1037 ) 21.8426 Tj
0 -389.2278 Td
(1038 ) 21.8426 Tj
0 -398.7211 Td
(1039 ) 21.8426 Tj
0 -408.2145 Td
(1040 ) 21.8426 Tj
0 -417.7079 Td
(1041 ) 21.8426 Tj
0 -427.2012 Td
(1042 ) 21.8426 Tj
0 -436.6946 Td
(1043 ) 21.8426 Tj
0 -446.1879 Td
(1044 ) 21.8426 Tj
0 -455.6813 Td
(1045 ) 21.8426 Tj
0 -465.1747 Td
(1046 ) 21.8426 Tj
0 -474.668 Td
(1047 ) 21.8426 Tj
0 -484.1614 Td
(1048 ) 21.8426 Tj
0 -493.6547 Td
(1049 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 10) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/bootother.S  Page 2) 183.4776 Tj
0 -28.4801 Td
(1050   # Switch from real to protected mode, using a bootstrap \
GDT) 288.322 Tj
0 -37.9735 Td
(1051   # and segment translation that makes virtual addresses) 266.4794 Tj
0 -47.4668 Td
(1052   # identical to physical addresses, so that the) 231.5313 Tj
0 -56.9602 Td
(1053   # effective memory map does not change during the switch\
.) 279.5849 Tj
0 -66.4535 Td
(1054   lgdt    gdtdesc) 96.1073 Tj
0 -75.9469 Td
(1055   movl    %cr0, %eax) 109.2129 Tj
0 -85.4403 Td
(1056   orl     $CR0_PE, %eax) 122.3184 Tj
0 -94.9336 Td
(1057   movl    %eax, %cr0) 109.2129 Tj
0 -104.427 Td
(1058 ) 21.8426 Tj
0 -113.9203 Td
(1059   # Jump to next instruction, but in 32-bit code segment.) 270.8479 Tj
0 -123.4137 Td
(1060   # Switches processor into 32-bit mode.) 196.5831 Tj
0 -132.9071 Td
(1061   ljmp    $\(SEG_KCODE<<3\), $start32) 174.7406 Tj
0 -142.4004 Td
(1062 ) 21.8426 Tj
0 -151.8938 Td
(1063 .code32                       # Assemble for 32-bit mode) 266.4794 Tj
0 -161.3871 Td
(1064 start32:) 56.7907 Tj
0 -170.8805 Td
(1065   # Set up the protected-mode data segment registers) 249.0053 Tj
0 -180.3739 Td
(1066   movw    $\(SEG_KDATA<<3\), %ax    # Our data segment sel\
ector) 288.322 Tj
0 -189.8672 Td
(1067   movw    %ax, %ds                # -> DS: Data Segment) 262.1109 Tj
0 -199.3606 Td
(1068   movw    %ax, %es                # -> ES: Extra Segment) 266.4794 Tj
0 -208.8539 Td
(1069   movw    %ax, %ss                # -> SS: Stack Segment) 266.4794 Tj
0 -218.3473 Td
(1070   movw    $0, %ax                 # Zero segments not read\
y for use) 314.533 Tj
0 -227.8407 Td
(1071   movw    %ax, %fs                # -> FS) 200.9517 Tj
0 -237.334 Td
(1072   movw    %ax, %gs                # -> GS) 200.9517 Tj
0 -246.8274 Td
(1073 ) 21.8426 Tj
0 -256.3207 Td
(1074   # Set up the stack pointer and call into C.) 218.4257 Tj
0 -265.8141 Td
(1075   movl    start-4, %esp) 122.3184 Tj
0 -275.3075 Td
(1076   call) 48.0537 Tj
-2507.8 TJm
(*\(start-8\)) 43.6851 Tj
0 -284.8008 Td
(1077 ) 21.8426 Tj
0 -294.2942 Td
(1078   # If the call returns \(it shouldn't\), trigger a Bochs) 262.1109 Tj
0 -303.7875 Td
(1079   # breakpoint if running under Bochs, then loop.) 235.8998 Tj
0 -313.2809 Td
(1080   movw    $0x8a00, %ax            # 0x8a00 -> port 0x8a00) 270.8479 Tj
0 -322.7743 Td
(1081   movw    %ax, %dx) 100.4758 Tj
0 -332.2676 Td
(1082   outw    %ax, %dx) 100.4758 Tj
0 -341.761 Td
(1083   movw    $0x8e00, %ax            # 0x8e00 -> port 0x8a00) 270.8479 Tj
0 -351.2543 Td
(1084   outw    %ax, %dx) 100.4758 Tj
0 -360.7477 Td
(1085 spin:) 43.6851 Tj
0 -370.2411 Td
(1086   jmp     spin) 83.0018 Tj
0 -379.7344 Td
(1087 ) 21.8426 Tj
0 -389.2278 Td
(1088 # Bootstrap GDT) 87.3703 Tj
0 -398.7211 Td
(1089 .p2align 2                                # force 4 byte a\
lignment) 310.1645 Tj
0 -408.2145 Td
(1090 gdt:) 39.3166 Tj
0 -417.7079 Td
(1091   SEG_NULLASM                             # null seg) 249.0053 Tj
0 -427.2012 Td
(1092   SEG_ASM\(STA_X|STA_R, 0x0, 0xffffffff\)   # code seg) 249.0053 Tj
0 -436.6946 Td
(1093   SEG_ASM\(STA_W, 0x0, 0xffffffff\)         # data seg) 249.0053 Tj
0 -446.1879 Td
(1094 ) 21.8426 Tj
0 -455.6813 Td
(1095 gdtdesc:) 56.7907 Tj
0 -465.1747 Td
(1096   .word   \(gdtdesc - gdt - 1\)                           \
 # sizeof\(gdt\) - 1) 345.1126 Tj
0 -474.668 Td
(1097   .long   gdt                             # address gdt) 262.1109 Tj
0 -484.1614 Td
(1098 ) 21.8426 Tj
0 -493.6547 Td
(1099 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 10) 34.9481 Tj
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[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/bootmain.c  Page 1) 179.1091 Tj
0 -28.4801 Td
(1100 // Boot loader.) 87.3703 Tj
0 -37.9735 Td
(1101 //) 30.5796 Tj
0 -47.4668 Td
(1102 // Part of the boot sector, along with bootasm.S, which ca\
lls bootmain\(\).) 340.7441 Tj
0 -56.9602 Td
(1103 // bootasm.S has put the processor into protected 32-bit m\
ode.) 292.6905 Tj
0 -66.4535 Td
(1104 // bootmain\(\) loads an ELF kernel image from the disk st\
arting at) 305.796 Tj
0 -75.9469 Td
(1105 // sector 1 and then jumps to the kernel entry routine.) 262.1109 Tj
0 -85.4403 Td
(1106 ) 21.8426 Tj
0 -94.9336 Td
(1107 #include "types.h") 100.4758 Tj
0 -104.427 Td
(1108 #include "elf.h") 91.7388 Tj
0 -113.9203 Td
(1109 #include "x86.h") 91.7388 Tj
0 -123.4137 Td
(1110 ) 21.8426 Tj
0 -132.9071 Td
(1111 #define SECTSIZE  512) 113.5814 Tj
0 -142.4004 Td
(1112 ) 21.8426 Tj
0 -151.8938 Td
(1113 void readseg\(uchar*, uint, uint\);) 166.0035 Tj
0 -161.3871 Td
(1114 ) 21.8426 Tj
0 -170.8805 Td
(1115 void) 39.3166 Tj
0 -180.3739 Td
(1116 bootmain\(void\)) 83.0018 Tj
0 -189.8672 Td
(1117 {) 26.2111 Tj
0 -199.3606 Td
(1118   struct elfhdr *elf;) 113.5814 Tj
0 -208.8539 Td
(1119   struct proghdr *ph, *eph;) 139.7925 Tj
0 -218.3473 Td
(1120   void \(*entry\)\(void\);) 117.9499 Tj
0 -227.8407 Td
(1121   uchar* va;) 74.2647 Tj
0 -237.334 Td
(1122 ) 21.8426 Tj
0 -246.8274 Td
(1123   elf = \(struct elfhdr*\)0x10000;  // scratch space) 240.2683 Tj
0 -256.3207 Td
(1124 ) 21.8426 Tj
0 -265.8141 Td
(1125   // Read 1st page off disk) 139.7925 Tj
0 -275.3075 Td
(1126   readseg\(\(uchar*\)elf, 4096, 0\);) 161.635 Tj
0 -284.8008 Td
(1127 ) 21.8426 Tj
0 -294.2942 Td
(1128   // Is this an ELF executable?) 157.2665 Tj
0 -303.7875 Td
(1129   if\(elf->magic != ELF_MAGIC\)) 148.5295 Tj
0 -313.2809 Td
(1130     return;  // let bootasm.S handle error) 205.3202 Tj
0 -322.7743 Td
(1131 ) 21.8426 Tj
0 -332.2676 Td
(1132   // Load each program segment \(ignores ph flags\).) 240.2683 Tj
0 -341.761 Td
(1133   ph = \(struct proghdr*\)\(\(uchar*\)elf + elf->phoff\);) 244.6368 Tj
0 -351.2543 Td
(1134   eph = ph + elf->phnum;) 126.6869 Tj
0 -360.7477 Td
(1135   for\(; ph < eph; ph++\) {) 131.0554 Tj
0 -370.2411 Td
(1136     va = \(uchar*\)\(ph->va & 0xFFFFFF\);) 183.4776 Tj
0 -379.7344 Td
(1137     readseg\(va, ph->filesz, ph->offset\);) 196.5831 Tj
0 -389.2278 Td
(1138     if\(ph->memsz > ph->filesz\)) 152.898 Tj
0 -398.7211 Td
(1139       stosb\(va + ph->filesz, 0, ph->memsz - ph->filesz\);) 266.4794 Tj
0 -408.2145 Td
(1140   }) 34.9481 Tj
0 -417.7079 Td
(1141 ) 21.8426 Tj
0 -427.2012 Td
(1142   // Call the entry point from the ELF header.) 222.7942 Tj
0 -436.6946 Td
(1143   // Does not return!) 113.5814 Tj
0 -446.1879 Td
(1144   entry = \(void\(*\)\(void\)\)\(elf->entry & 0xFFFFFF\);) 235.8998 Tj
0 -455.6813 Td
(1145   entry\(\);) 65.5277 Tj
0 -465.1747 Td
(1146 }) 26.2111 Tj
0 -474.668 Td
(1147 ) 21.8426 Tj
0 -484.1614 Td
(1148 ) 21.8426 Tj
0 -493.6547 Td
(1149 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 11) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/bootmain.c  Page 2) 179.1091 Tj
0 -28.4801 Td
(1150 void) 39.3166 Tj
0 -37.9735 Td
(1151 waitdisk\(void\)) 83.0018 Tj
0 -47.4668 Td
(1152 {) 26.2111 Tj
0 -56.9602 Td
(1153   // Wait for disk ready.) 131.0554 Tj
0 -66.4535 Td
(1154   while\(\(inb\(0x1F7\) & 0xC0\) != 0x40\)) 179.1091 Tj
0 -75.9469 Td
(1155     ;) 43.6851 Tj
0 -85.4403 Td
(1156 }) 26.2111 Tj
0 -94.9336 Td
(1157 ) 21.8426 Tj
0 -104.427 Td
(1158 // Read a single sector at offset into dst.) 209.6887 Tj
0 -113.9203 Td
(1159 void) 39.3166 Tj
0 -123.4137 Td
(1160 readsect\(void *dst, uint offset\)) 161.635 Tj
0 -132.9071 Td
(1161 {) 26.2111 Tj
0 -142.4004 Td
(1162   // Issue command.) 104.8443 Tj
0 -151.8938 Td
(1163   waitdisk\(\);) 78.6333 Tj
0 -161.3871 Td
(1164   outb\(0x1F2, 1\);   // count = 1) 161.635 Tj
0 -170.8805 Td
(1165   outb\(0x1F3, offset\);) 117.9499 Tj
0 -180.3739 Td
(1166   outb\(0x1F4, offset >> 8\);) 139.7925 Tj
0 -189.8672 Td
(1167   outb\(0x1F5, offset >> 16\);) 144.161 Tj
0 -199.3606 Td
(1168   outb\(0x1F6, \(offset >> 24\) | 0xE0\);) 183.4776 Tj
0 -208.8539 Td
(1169   outb\(0x1F7, 0x20\);  // cmd 0x20 - read sectors) 231.5313 Tj
0 -218.3473 Td
(1170 ) 21.8426 Tj
0 -227.8407 Td
(1171   // Read data.) 87.3703 Tj
0 -237.334 Td
(1172   waitdisk\(\);) 78.6333 Tj
0 -246.8274 Td
(1173   insl\(0x1F0, dst, SECTSIZE/4\);) 157.2665 Tj
0 -256.3207 Td
(1174 }) 26.2111 Tj
0 -265.8141 Td
(1175 ) 21.8426 Tj
0 -275.3075 Td
(1176 // Read 'count' bytes at 'offset' from kernel into virtual\
 address 'va'.) 336.3756 Tj
0 -284.8008 Td
(1177 // Might copy more than asked.) 152.898 Tj
0 -294.2942 Td
(1178 void) 39.3166 Tj
0 -303.7875 Td
(1179 readseg\(uchar* va, uint count, uint offset\)) 209.6887 Tj
0 -313.2809 Td
(1180 {) 26.2111 Tj
0 -322.7743 Td
(1181   uchar* eva;) 78.6333 Tj
0 -332.2676 Td
(1182 ) 21.8426 Tj
0 -341.761 Td
(1183   eva = va + count;) 104.8443 Tj
0 -351.2543 Td
(1184 ) 21.8426 Tj
0 -360.7477 Td
(1185   // Round down to sector boundary.) 174.7406 Tj
0 -370.2411 Td
(1186   va -= offset % SECTSIZE;) 135.4239 Tj
0 -379.7344 Td
(1187 ) 21.8426 Tj
0 -389.2278 Td
(1188   // Translate from bytes to sectors; kernel starts at sec\
tor 1.) 301.4275 Tj
0 -398.7211 Td
(1189   offset = \(offset / SECTSIZE\) + 1;) 174.7406 Tj
0 -408.2145 Td
(1190 ) 21.8426 Tj
0 -417.7079 Td
(1191   // If this is too slow, we could read lots of sectors at\
 a time.) 310.1645 Tj
0 -427.2012 Td
(1192   // We'd write more to memory than asked, but it doesn't \
matter --) 314.533 Tj
0 -436.6946 Td
(1193   // we load in increasing order.) 166.0035 Tj
0 -446.1879 Td
(1194   for\(; va < eva; va += SECTSIZE, offset++\)) 209.6887 Tj
0 -455.6813 Td
(1195     readsect\(va, offset\);) 131.0554 Tj
0 -465.1747 Td
(1196 }) 26.2111 Tj
0 -474.668 Td
(1197 ) 21.8426 Tj
0 -484.1614 Td
(1198 ) 21.8426 Tj
0 -493.6547 Td
(1199 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 11) 34.9481 Tj
Q
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%%Page: 19 19
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180 rotate
-612 -792 translate
0 0 612 792 re W
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[] 0 d
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180 3960 5760 3460 re
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0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/main.c  Page 1) 161.635 Tj
0 -28.4801 Td
(1200 #include "types.h") 100.4758 Tj
0 -37.9735 Td
(1201 #include "defs.h") 96.1073 Tj
0 -47.4668 Td
(1202 #include "param.h") 100.4758 Tj
0 -56.9602 Td
(1203 #include "mmu.h") 91.7388 Tj
0 -66.4535 Td
(1204 #include "proc.h") 96.1073 Tj
0 -75.9469 Td
(1205 #include "x86.h") 91.7388 Tj
0 -85.4403 Td
(1206 ) 21.8426 Tj
0 -94.9336 Td
(1207 __thread struct cpu *c;) 122.3184 Tj
0 -104.427 Td
(1208 __thread struct proc *cp;) 131.0554 Tj
0 -113.9203 Td
(1209 ) 21.8426 Tj
0 -123.4137 Td
(1210 static void bootothers\(void\);) 148.5295 Tj
0 -132.9071 Td
(1211 static void mpmain\(void\) __attribute__\(\(noreturn\)\);) 244.6368 Tj
0 -142.4004 Td
(1212 ) 21.8426 Tj
0 -151.8938 Td
(1213 // Bootstrap processor starts running C code here.) 240.2683 Tj
0 -161.3871 Td
(1214 int) 34.9481 Tj
0 -170.8805 Td
(1215 main\(void\)) 65.5277 Tj
0 -180.3739 Td
(1216 {) 26.2111 Tj
0 -189.8672 Td
(1217   mpinit\(\); // collect info about this machine) 222.7942 Tj
0 -199.3606 Td
(1218   lapicinit\(mpbcpu\(\)\);) 117.9499 Tj
0 -208.8539 Td
(1219   ksegment\(\);) 78.6333 Tj
0 -218.3473 Td
(1220   picinit\(\);       // interrupt controller) 205.3202 Tj
0 -227.8407 Td
(1221   ioapicinit\(\);    // another interrupt controller) 240.2683 Tj
0 -237.334 Td
(1222   consoleinit\(\);   // I/O devices & their interrupts) 249.0053 Tj
0 -246.8274 Td
(1223   uartinit\(\);      // serial port) 166.0035 Tj
0 -256.3207 Td
(1224   cprintf\("\\ncpu%d: starting xv6\\n\\n", cpu\(\)\);) 222.7942 Tj
0 -265.8141 Td
(1225 ) 21.8426 Tj
0 -275.3075 Td
(1226   kinit\(\);         // physical memory allocator) 227.1628 Tj
0 -284.8008 Td
(1227   pinit\(\);         // process table) 174.7406 Tj
0 -294.2942 Td
(1228   tvinit\(\);        // trap vectors) 170.3721 Tj
0 -303.7875 Td
(1229   binit\(\);         // buffer cache) 170.3721 Tj
0 -313.2809 Td
(1230   fileinit\(\);      // file table) 161.635 Tj
0 -322.7743 Td
(1231   iinit\(\);         // inode cache) 166.0035 Tj
0 -332.2676 Td
(1232   ideinit\(\);       // disk) 135.4239 Tj
0 -341.761 Td
(1233   if\(!ismp\)) 69.8962 Tj
0 -351.2543 Td
(1234     timerinit\(\);   // uniprocessor timer) 196.5831 Tj
0 -360.7477 Td
(1235   userinit\(\);      // first user process) 196.5831 Tj
0 -370.2411 Td
(1236   bootothers\(\);    // start other processors) 214.0572 Tj
0 -379.7344 Td
(1237 ) 21.8426 Tj
0 -389.2278 Td
(1238   // Finish setting up this processor in mpmain.) 231.5313 Tj
0 -398.7211 Td
(1239   mpmain\(\);) 69.8962 Tj
0 -408.2145 Td
(1240 }) 26.2111 Tj
0 -417.7079 Td
(1241 ) 21.8426 Tj
0 -427.2012 Td
(1242 ) 21.8426 Tj
0 -436.6946 Td
(1243 ) 21.8426 Tj
0 -446.1879 Td
(1244 ) 21.8426 Tj
0 -455.6813 Td
(1245 ) 21.8426 Tj
0 -465.1747 Td
(1246 ) 21.8426 Tj
0 -474.668 Td
(1247 ) 21.8426 Tj
0 -484.1614 Td
(1248 ) 21.8426 Tj
0 -493.6547 Td
(1249 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 12) 34.9481 Tj
Q
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q
180 500 5760 3460 re
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/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/main.c  Page 2) 161.635 Tj
0 -28.4801 Td
(1250 // Bootstrap processor gets here after setting up the hard\
ware.) 297.059 Tj
0 -37.9735 Td
(1251 // Additional processors start here.) 179.1091 Tj
0 -47.4668 Td
(1252 static void) 69.8962 Tj
0 -56.9602 Td
(1253 mpmain\(void\)) 74.2647 Tj
0 -66.4535 Td
(1254 {) 26.2111 Tj
0 -75.9469 Td
(1255   if\(cpu\(\) != mpbcpu\(\)\)) 122.3184 Tj
0 -85.4403 Td
(1256     lapicinit\(cpu\(\)\);) 113.5814 Tj
0 -94.9336 Td
(1257   ksegment\(\);) 78.6333 Tj
0 -104.427 Td
(1258   cprintf\("cpu%d: mpmain\\n", cpu\(\)\);) 179.1091 Tj
0 -113.9203 Td
(1259   idtinit\(\);) 74.2647 Tj
0 -123.4137 Td
(1260   xchg\(&c->booted, 1\);) 117.9499 Tj
0 -132.9071 Td
(1261 ) 21.8426 Tj
0 -142.4004 Td
(1262   cprintf\("cpu%d: scheduling\\n", cpu\(\)\);) 196.5831 Tj
0 -151.8938 Td
(1263   scheduler\(\);) 83.0018 Tj
0 -161.3871 Td
(1264 }) 26.2111 Tj
0 -170.8805 Td
(1265 ) 21.8426 Tj
0 -180.3739 Td
(1266 static void) 69.8962 Tj
0 -189.8672 Td
(1267 bootothers\(void\)) 91.7388 Tj
0 -199.3606 Td
(1268 {) 26.2111 Tj
0 -208.8539 Td
(1269   extern uchar _binary_bootother_start[], _binary_bootothe\
r_size[];) 314.533 Tj
0 -218.3473 Td
(1270   uchar *code;) 83.0018 Tj
0 -227.8407 Td
(1271   struct cpu *c;) 91.7388 Tj
0 -237.334 Td
(1272   char *stack;) 83.0018 Tj
0 -246.8274 Td
(1273 ) 21.8426 Tj
0 -256.3207 Td
(1274   // Write bootstrap code to unused memory at 0x7000.) 253.3738 Tj
0 -265.8141 Td
(1275   code = \(uchar*\)0x7000;) 126.6869 Tj
0 -275.3075 Td
(1276   memmove\(code, _binary_bootother_start, \(uint\)_binary_\
bootother_size\);) 332.0071 Tj
0 -284.8008 Td
(1277 ) 21.8426 Tj
0 -294.2942 Td
(1278   for\(c = cpus; c < cpus+ncpu; c++\){) 179.1091 Tj
0 -303.7875 Td
(1279     if\(c == cpus+cpu\(\)\)  // We've started already.) 240.2683 Tj
0 -313.2809 Td
(1280       continue;) 87.3703 Tj
0 -322.7743 Td
(1281 ) 21.8426 Tj
0 -332.2676 Td
(1282     // Fill in %esp, %eip and start code on cpu.) 231.5313 Tj
0 -341.761 Td
(1283     stack = kalloc\(KSTACKSIZE\);) 157.2665 Tj
0 -351.2543 Td
(1284     *\(void**\)\(code-4\) = stack + KSTACKSIZE;) 209.6887 Tj
0 -360.7477 Td
(1285     *\(void**\)\(code-8\) = mpmain;) 157.2665 Tj
0 -370.2411 Td
(1286     lapicstartap\(c->apicid, \(uint\)code\);) 196.5831 Tj
0 -379.7344 Td
(1287 ) 21.8426 Tj
0 -389.2278 Td
(1288     // Wait for cpu to get through bootstrap.) 218.4257 Tj
0 -398.7211 Td
(1289     while\(c->booted == 0\)) 131.0554 Tj
0 -408.2145 Td
(1290       ;) 52.4222 Tj
0 -417.7079 Td
(1291   }) 34.9481 Tj
0 -427.2012 Td
(1292 }) 26.2111 Tj
0 -436.6946 Td
(1293 ) 21.8426 Tj
0 -446.1879 Td
(1294 ) 21.8426 Tj
0 -455.6813 Td
(1295 ) 21.8426 Tj
0 -465.1747 Td
(1296 ) 21.8426 Tj
0 -474.668 Td
(1297 ) 21.8426 Tj
0 -484.1614 Td
(1298 ) 21.8426 Tj
0 -493.6547 Td
(1299 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 12) 34.9481 Tj
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-612 -792 translate
0 0 612 792 re W
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[] 0 d
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10 M
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/DeviceGray {} cs
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0 0 612 792 re
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180 3960 5760 3460 re
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[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/spinlock.h  Page 1) 179.1091 Tj
0 -28.4801 Td
(1300 // Mutual exclusion lock.) 131.0554 Tj
0 -37.9735 Td
(1301 struct spinlock {) 96.1073 Tj
0 -47.4668 Td
(1302   uint locked;   // Is the lock held?) 183.4776 Tj
0 -56.9602 Td
(1303 ) 21.8426 Tj
0 -66.4535 Td
(1304   // For debugging:) 104.8443 Tj
0 -75.9469 Td
(1305   char *name;    // Name of lock.) 166.0035 Tj
0 -85.4403 Td
(1306   int  cpu;      // The number of the cpu holding the lock\
.) 279.5849 Tj
0 -94.9336 Td
(1307   uint pcs[10];  // The call stack \(an array of program c\
ounters\)) 305.796 Tj
0 -104.427 Td
(1308                  // that locked the lock.) 200.9517 Tj
0 -113.9203 Td
(1309 };) 30.5796 Tj
0 -123.4137 Td
(1310 ) 21.8426 Tj
0 -132.9071 Td
(1311 ) 21.8426 Tj
0 -142.4004 Td
(1312 ) 21.8426 Tj
0 -151.8938 Td
(1313 ) 21.8426 Tj
0 -161.3871 Td
(1314 ) 21.8426 Tj
0 -170.8805 Td
(1315 ) 21.8426 Tj
0 -180.3739 Td
(1316 ) 21.8426 Tj
0 -189.8672 Td
(1317 ) 21.8426 Tj
0 -199.3606 Td
(1318 ) 21.8426 Tj
0 -208.8539 Td
(1319 ) 21.8426 Tj
0 -218.3473 Td
(1320 ) 21.8426 Tj
0 -227.8407 Td
(1321 ) 21.8426 Tj
0 -237.334 Td
(1322 ) 21.8426 Tj
0 -246.8274 Td
(1323 ) 21.8426 Tj
0 -256.3207 Td
(1324 ) 21.8426 Tj
0 -265.8141 Td
(1325 ) 21.8426 Tj
0 -275.3075 Td
(1326 ) 21.8426 Tj
0 -284.8008 Td
(1327 ) 21.8426 Tj
0 -294.2942 Td
(1328 ) 21.8426 Tj
0 -303.7875 Td
(1329 ) 21.8426 Tj
0 -313.2809 Td
(1330 ) 21.8426 Tj
0 -322.7743 Td
(1331 ) 21.8426 Tj
0 -332.2676 Td
(1332 ) 21.8426 Tj
0 -341.761 Td
(1333 ) 21.8426 Tj
0 -351.2543 Td
(1334 ) 21.8426 Tj
0 -360.7477 Td
(1335 ) 21.8426 Tj
0 -370.2411 Td
(1336 ) 21.8426 Tj
0 -379.7344 Td
(1337 ) 21.8426 Tj
0 -389.2278 Td
(1338 ) 21.8426 Tj
0 -398.7211 Td
(1339 ) 21.8426 Tj
0 -408.2145 Td
(1340 ) 21.8426 Tj
0 -417.7079 Td
(1341 ) 21.8426 Tj
0 -427.2012 Td
(1342 ) 21.8426 Tj
0 -436.6946 Td
(1343 ) 21.8426 Tj
0 -446.1879 Td
(1344 ) 21.8426 Tj
0 -455.6813 Td
(1345 ) 21.8426 Tj
0 -465.1747 Td
(1346 ) 21.8426 Tj
0 -474.668 Td
(1347 ) 21.8426 Tj
0 -484.1614 Td
(1348 ) 21.8426 Tj
0 -493.6547 Td
(1349 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 13) 34.9481 Tj
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180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
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[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/spinlock.c  Page 1) 179.1091 Tj
0 -28.4801 Td
(1350 // Mutual exclusion spin locks.) 157.2665 Tj
0 -37.9735 Td
(1351 ) 21.8426 Tj
0 -47.4668 Td
(1352 #include "types.h") 100.4758 Tj
0 -56.9602 Td
(1353 #include "defs.h") 96.1073 Tj
0 -66.4535 Td
(1354 #include "param.h") 100.4758 Tj
0 -75.9469 Td
(1355 #include "x86.h") 91.7388 Tj
0 -85.4403 Td
(1356 #include "mmu.h") 91.7388 Tj
0 -94.9336 Td
(1357 #include "proc.h") 96.1073 Tj
0 -104.427 Td
(1358 #include "spinlock.h") 113.5814 Tj
0 -113.9203 Td
(1359 ) 21.8426 Tj
0 -123.4137 Td
(1360 void) 39.3166 Tj
0 -132.9071 Td
(1361 initlock\(struct spinlock *lk, char *name\)) 200.9517 Tj
0 -142.4004 Td
(1362 {) 26.2111 Tj
0 -151.8938 Td
(1363   lk->name = name;) 100.4758 Tj
0 -161.3871 Td
(1364   lk->locked = 0;) 96.1073 Tj
0 -170.8805 Td
(1365   lk->cpu = 0xffffffff;) 122.3184 Tj
0 -180.3739 Td
(1366 }) 26.2111 Tj
0 -189.8672 Td
(1367 ) 21.8426 Tj
0 -199.3606 Td
(1368 // Acquire the lock.) 109.2129 Tj
0 -208.8539 Td
(1369 // Loops \(spins\) until the lock is acquired.) 214.0572 Tj
0 -218.3473 Td
(1370 // Holding a lock for a long time may cause) 209.6887 Tj
0 -227.8407 Td
(1371 // other CPUs to waste time spinning to acquire it.) 244.6368 Tj
0 -237.334 Td
(1372 void) 39.3166 Tj
0 -246.8274 Td
(1373 acquire\(struct spinlock *lk\)) 144.161 Tj
0 -256.3207 Td
(1374 {) 26.2111 Tj
0 -265.8141 Td
(1375   pushcli\(\);) 74.2647 Tj
0 -275.3075 Td
(1376   if\(holding\(lk\)\)) 96.1073 Tj
0 -284.8008 Td
(1377     panic\("acquire"\);) 113.5814 Tj
0 -294.2942 Td
(1378 ) 21.8426 Tj
0 -303.7875 Td
(1379   // The xchg is atomic.) 126.6869 Tj
0 -313.2809 Td
(1380   // It also serializes, so that reads after acquire are n\
ot) 283.9534 Tj
0 -322.7743 Td
(1381   // reordered before it.) 131.0554 Tj
0 -332.2676 Td
(1382   while\(xchg\(&lk->locked, 1\) != 0\)) 170.3721 Tj
0 -341.761 Td
(1383     ;) 43.6851 Tj
0 -351.2543 Td
(1384 ) 21.8426 Tj
0 -360.7477 Td
(1385   // Record info about lock acquisition for debugging.) 257.7424 Tj
0 -370.2411 Td
(1386   // The +10 is only so that we can tell the difference) 262.1109 Tj
0 -379.7344 Td
(1387   // between forgetting to initialize lock->cpu) 227.1628 Tj
0 -389.2278 Td
(1388   // and holding a lock on cpu 0.) 166.0035 Tj
0 -398.7211 Td
(1389   lk->cpu = cpu\(\) + 10;) 122.3184 Tj
0 -408.2145 Td
(1390   getcallerpcs\(&lk, lk->pcs\);) 148.5295 Tj
0 -417.7079 Td
(1391 }) 26.2111 Tj
0 -427.2012 Td
(1392 ) 21.8426 Tj
0 -436.6946 Td
(1393 ) 21.8426 Tj
0 -446.1879 Td
(1394 ) 21.8426 Tj
0 -455.6813 Td
(1395 ) 21.8426 Tj
0 -465.1747 Td
(1396 ) 21.8426 Tj
0 -474.668 Td
(1397 ) 21.8426 Tj
0 -484.1614 Td
(1398 ) 21.8426 Tj
0 -493.6547 Td
(1399 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 13) 34.9481 Tj
Q
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showpage
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%%Page: 21 21
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%%PageOrientation: Landscape
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-612 -792 translate
0 0 612 792 re W
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[] 0 d
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0 0 612 792 re
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q
180 3960 5760 3460 re
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[0] sc
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[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/spinlock.c  Page 2) 179.1091 Tj
0 -28.4801 Td
(1400 // Release the lock.) 109.2129 Tj
0 -37.9735 Td
(1401 void) 39.3166 Tj
0 -47.4668 Td
(1402 release\(struct spinlock *lk\)) 144.161 Tj
0 -56.9602 Td
(1403 {) 26.2111 Tj
0 -66.4535 Td
(1404   if\(!holding\(lk\)\)) 100.4758 Tj
0 -75.9469 Td
(1405     panic\("release"\);) 113.5814 Tj
0 -85.4403 Td
(1406 ) 21.8426 Tj
0 -94.9336 Td
(1407   lk->pcs[0] = 0;) 96.1073 Tj
0 -104.427 Td
(1408   lk->cpu = 0xffffffff;) 122.3184 Tj
0 -113.9203 Td
(1409 ) 21.8426 Tj
0 -123.4137 Td
(1410   // The xchg serializes, so that reads before release are) 275.2164 Tj
0 -132.9071 Td
(1411   // not reordered after it.  The 1996 PentiumPro manual \(\
Volume 3,) 314.533 Tj
0 -142.4004 Td
(1412   // 7.2\) says reads can be carried out speculatively and\
 in) 283.9534 Tj
0 -151.8938 Td
(1413   // any order, which implies we need to serialize here.) 266.4794 Tj
0 -161.3871 Td
(1414   // But the 2007 Intel 64 Architecture Memory Ordering Wh\
ite) 288.322 Tj
0 -170.8805 Td
(1415   // Paper says that Intel 64 and IA-32 will not move a lo\
ad) 283.9534 Tj
0 -180.3739 Td
(1416   // after a store. So lock->locked = 0 would work here.) 266.4794 Tj
0 -189.8672 Td
(1417   // The xchg being asm volatile ensures gcc emits it afte\
r) 279.5849 Tj
0 -199.3606 Td
(1418   // the above assignments \(and after the critical sectio\
n\).) 283.9534 Tj
0 -208.8539 Td
(1419   xchg\(&lk->locked, 0\);) 122.3184 Tj
0 -218.3473 Td
(1420 ) 21.8426 Tj
0 -227.8407 Td
(1421   popcli\(\);) 69.8962 Tj
0 -237.334 Td
(1422 }) 26.2111 Tj
0 -246.8274 Td
(1423 ) 21.8426 Tj
0 -256.3207 Td
(1424 // Record the current call stack in pcs[] by following the\
 %ebp chain.) 327.6386 Tj
0 -265.8141 Td
(1425 void) 39.3166 Tj
0 -275.3075 Td
(1426 getcallerpcs\(void *v, uint pcs[]\)) 166.0035 Tj
0 -284.8008 Td
(1427 {) 26.2111 Tj
0 -294.2942 Td
(1428   uint *ebp;) 74.2647 Tj
0 -303.7875 Td
(1429   int i;) 56.7907 Tj
0 -313.2809 Td
(1430 ) 21.8426 Tj
0 -322.7743 Td
(1431   ebp = \(uint*\)v - 2;) 113.5814 Tj
0 -332.2676 Td
(1432   for\(i = 0; i < 10; i++\){) 135.4239 Tj
0 -341.761 Td
(1433     if\(ebp == 0 || ebp == \(uint*\)0xffffffff\)) 214.0572 Tj
0 -351.2543 Td
(1434       break;) 74.2647 Tj
0 -360.7477 Td
(1435     pcs[i] = ebp[1];     // saved %eip) 187.8461 Tj
0 -370.2411 Td
(1436     ebp = \(uint*\)ebp[0]; // saved %ebp) 187.8461 Tj
0 -379.7344 Td
(1437   }) 34.9481 Tj
0 -389.2278 Td
(1438   for\(; i < 10; i++\)) 109.2129 Tj
0 -398.7211 Td
(1439     pcs[i] = 0;) 87.3703 Tj
0 -408.2145 Td
(1440 }) 26.2111 Tj
0 -417.7079 Td
(1441 ) 21.8426 Tj
0 -427.2012 Td
(1442 // Check whether this cpu is holding the lock.) 222.7942 Tj
0 -436.6946 Td
(1443 int) 34.9481 Tj
0 -446.1879 Td
(1444 holding\(struct spinlock *lock\)) 152.898 Tj
0 -455.6813 Td
(1445 {) 26.2111 Tj
0 -465.1747 Td
(1446   return lock->locked && lock->cpu == cpu\(\) + 10;) 235.8998 Tj
0 -474.668 Td
(1447 }) 26.2111 Tj
0 -484.1614 Td
(1448 ) 21.8426 Tj
0 -493.6547 Td
(1449 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 14) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/spinlock.c  Page 3) 179.1091 Tj
0 -28.4801 Td
(1450 // Pushcli/popcli are like cli/sti except that they are ma\
tched:) 301.4275 Tj
0 -37.9735 Td
(1451 // it takes two popcli to undo two pushcli.  Also, if inte\
rrupts) 301.4275 Tj
0 -47.4668 Td
(1452 // are off, then pushcli, popcli leaves them off.) 235.8998 Tj
0 -56.9602 Td
(1453 ) 21.8426 Tj
0 -66.4535 Td
(1454 void) 39.3166 Tj
0 -75.9469 Td
(1455 pushcli\(void\)) 78.6333 Tj
0 -85.4403 Td
(1456 {) 26.2111 Tj
0 -94.9336 Td
(1457   int eflags;) 78.6333 Tj
0 -104.427 Td
(1458 ) 21.8426 Tj
0 -113.9203 Td
(1459   eflags = readeflags\(\);) 126.6869 Tj
0 -123.4137 Td
(1460   cli\(\);) 56.7907 Tj
0 -132.9071 Td
(1461   if\(c->ncli++ == 0\)) 109.2129 Tj
0 -142.4004 Td
(1462     c->intena = eflags & FL_IF;) 157.2665 Tj
0 -151.8938 Td
(1463 }) 26.2111 Tj
0 -161.3871 Td
(1464 ) 21.8426 Tj
0 -170.8805 Td
(1465 void) 39.3166 Tj
0 -180.3739 Td
(1466 popcli\(void\)) 74.2647 Tj
0 -189.8672 Td
(1467 {) 26.2111 Tj
0 -199.3606 Td
(1468   if\(readeflags\(\)&FL_IF\)) 126.6869 Tj
0 -208.8539 Td
(1469     panic\("popcli - interruptible"\);) 179.1091 Tj
0 -218.3473 Td
(1470   if\(--c->ncli < 0\)) 104.8443 Tj
0 -227.8407 Td
(1471     panic\("popcli"\);) 109.2129 Tj
0 -237.334 Td
(1472   if\(c->ncli == 0 && c->intena\)) 157.2665 Tj
0 -246.8274 Td
(1473     sti\(\);) 65.5277 Tj
0 -256.3207 Td
(1474 }) 26.2111 Tj
0 -265.8141 Td
(1475 ) 21.8426 Tj
0 -275.3075 Td
(1476 ) 21.8426 Tj
0 -284.8008 Td
(1477 ) 21.8426 Tj
0 -294.2942 Td
(1478 ) 21.8426 Tj
0 -303.7875 Td
(1479 ) 21.8426 Tj
0 -313.2809 Td
(1480 ) 21.8426 Tj
0 -322.7743 Td
(1481 ) 21.8426 Tj
0 -332.2676 Td
(1482 ) 21.8426 Tj
0 -341.761 Td
(1483 ) 21.8426 Tj
0 -351.2543 Td
(1484 ) 21.8426 Tj
0 -360.7477 Td
(1485 ) 21.8426 Tj
0 -370.2411 Td
(1486 ) 21.8426 Tj
0 -379.7344 Td
(1487 ) 21.8426 Tj
0 -389.2278 Td
(1488 ) 21.8426 Tj
0 -398.7211 Td
(1489 ) 21.8426 Tj
0 -408.2145 Td
(1490 ) 21.8426 Tj
0 -417.7079 Td
(1491 ) 21.8426 Tj
0 -427.2012 Td
(1492 ) 21.8426 Tj
0 -436.6946 Td
(1493 ) 21.8426 Tj
0 -446.1879 Td
(1494 ) 21.8426 Tj
0 -455.6813 Td
(1495 ) 21.8426 Tj
0 -465.1747 Td
(1496 ) 21.8426 Tj
0 -474.668 Td
(1497 ) 21.8426 Tj
0 -484.1614 Td
(1498 ) 21.8426 Tj
0 -493.6547 Td
(1499 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 14) 34.9481 Tj
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showpage
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-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
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0 0 612 792 re
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q
180 3960 5760 3460 re
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[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/proc.h  Page 1) 161.635 Tj
0 -28.4801 Td
(1500 // Segments in proc->gdt.) 131.0554 Tj
0 -37.9735 Td
(1501 // Also known to bootasm.S and trapasm.S) 196.5831 Tj
0 -47.4668 Td
(1502 #define SEG_KCODE 1  // kernel code) 174.7406 Tj
0 -56.9602 Td
(1503 #define SEG_KDATA 2  // kernel data+stack) 200.9517 Tj
0 -66.4535 Td
(1504 #define SEG_KCPU  3  // kernel per-cpu data) 209.6887 Tj
0 -75.9469 Td
(1505 #define SEG_UCODE 4) 104.8443 Tj
0 -85.4403 Td
(1506 #define SEG_UDATA 5) 104.8443 Tj
0 -94.9336 Td
(1507 #define SEG_TSS   6  // this process's task state) 235.8998 Tj
0 -104.427 Td
(1508 #define NSEGS     7) 104.8443 Tj
0 -113.9203 Td
(1509 ) 21.8426 Tj
0 -123.4137 Td
(1510 // Saved registers for kernel context switches.) 227.1628 Tj
0 -132.9071 Td
(1511 // Don't need to save all the segment registers \(%cs, etc\
\),) 279.5849 Tj
0 -142.4004 Td
(1512 // because they are constant across kernel contexts.) 249.0053 Tj
0 -151.8938 Td
(1513 // Don't need to save %eax, %ecx, %edx, because the) 244.6368 Tj
0 -161.3871 Td
(1514 // x86 convention is that the caller has saved them.) 249.0053 Tj
0 -170.8805 Td
(1515 // Contexts are stored at the bottom of the stack they) 257.7424 Tj
0 -180.3739 Td
(1516 // describe; the stack pointer is the address of the conte\
xt.) 288.322 Tj
0 -189.8672 Td
(1517 // The layout of the context must match the code in swtch.\
S.) 283.9534 Tj
0 -199.3606 Td
(1518 struct context {) 91.7388 Tj
0 -208.8539 Td
(1519   uint edi;) 69.8962 Tj
0 -218.3473 Td
(1520   uint esi;) 69.8962 Tj
0 -227.8407 Td
(1521   uint ebx;) 69.8962 Tj
0 -237.334 Td
(1522   uint ebp;) 69.8962 Tj
0 -246.8274 Td
(1523   uint eip;) 69.8962 Tj
0 -256.3207 Td
(1524 };) 30.5796 Tj
0 -265.8141 Td
(1525 ) 21.8426 Tj
0 -275.3075 Td
(1526 enum procstate { UNUSED, EMBRYO, SLEEPING, RUNNABLE, RUNNI\
NG, ZOMBIE };) 332.0071 Tj
0 -284.8008 Td
(1527 ) 21.8426 Tj
0 -294.2942 Td
(1528 // Per-process state) 109.2129 Tj
0 -303.7875 Td
(1529 struct proc {) 78.6333 Tj
0 -313.2809 Td
(1530   char *mem;                   // Start of process memory \
\(kernel address\)) 345.1126 Tj
0 -322.7743 Td
(1531   uint sz;                     // Size of process memory \(\
bytes\)) 301.4275 Tj
0 -332.2676 Td
(1532   char *kstack;                // Bottom of kernel stack f\
or this process) 340.7441 Tj
0 -341.761 Td
(1533   enum procstate state;       // Process state) 222.7942 Tj
0 -351.2543 Td
(1534   volatile int pid;            // Process ID) 214.0572 Tj
0 -360.7477 Td
(1535   struct proc *parent;         // Parent process) 231.5313 Tj
0 -370.2411 Td
(1536   struct trapframe *tf;        // Trap frame for current s\
yscall) 301.4275 Tj
0 -379.7344 Td
(1537   struct context *context;     // Switch here to run proce\
ss) 283.9534 Tj
0 -389.2278 Td
(1538   void *chan;                  // If non-zero, sleeping on\
 chan) 297.059 Tj
0 -398.7211 Td
(1539   int killed;                  // If non-zero, have been k\
illed) 297.059 Tj
0 -408.2145 Td
(1540   struct file *ofile[NOFILE];  // Open files) 214.0572 Tj
0 -417.7079 Td
(1541   struct inode *cwd;           // Current directory) 244.6368 Tj
0 -427.2012 Td
(1542   char name[16];               // Process name \(debugging\
\)) 275.2164 Tj
0 -436.6946 Td
(1543 };) 30.5796 Tj
0 -446.1879 Td
(1544 ) 21.8426 Tj
0 -455.6813 Td
(1545 ) 21.8426 Tj
0 -465.1747 Td
(1546 ) 21.8426 Tj
0 -474.668 Td
(1547 ) 21.8426 Tj
0 -484.1614 Td
(1548 ) 21.8426 Tj
0 -493.6547 Td
(1549 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 15) 34.9481 Tj
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180 500 5760 3460 re
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[0] sc
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[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/proc.h  Page 2) 161.635 Tj
0 -28.4801 Td
(1550 // Process memory is laid out contiguously, low addresses \
first:) 301.4275 Tj
0 -37.9735 Td
(1551 //   text) 61.1592 Tj
0 -47.4668 Td
(1552 //   original data and bss) 135.4239 Tj
0 -56.9602 Td
(1553 //   fixed-size stack) 113.5814 Tj
0 -66.4535 Td
(1554 //   expandable heap) 109.2129 Tj
0 -75.9469 Td
(1555 ) 21.8426 Tj
0 -85.4403 Td
(1556 // Per-CPU state) 91.7388 Tj
0 -94.9336 Td
(1557 struct cpu {) 74.2647 Tj
0 -104.427 Td
(1558   uchar apicid;                // Local APIC ID) 227.1628 Tj
0 -113.9203 Td
(1559   struct context *context;     // Switch here to enter sch\
eduler) 301.4275 Tj
0 -123.4137 Td
(1560   struct taskstate ts;         // Used by x86 to find stac\
k for interrupt) 340.7441 Tj
0 -132.9071 Td
(1561   struct segdesc gdt[NSEGS];   // x86 global descriptor ta\
ble) 288.322 Tj
0 -142.4004 Td
(1562   volatile uint booted;        // Has the CPU started?) 257.7424 Tj
0 -151.8938 Td
(1563   int ncli;                    // Depth of pushcli nesting\
.) 279.5849 Tj
0 -161.3871 Td
(1564   int intena;                  // Were interrupts enabled \
before pushcli?) 340.7441 Tj
0 -170.8805 Td
(1565   void *tls[2];) 87.3703 Tj
0 -180.3739 Td
(1566 };) 30.5796 Tj
0 -189.8672 Td
(1567 ) 21.8426 Tj
0 -199.3606 Td
(1568 extern struct cpu cpus[NCPU];) 148.5295 Tj
0 -208.8539 Td
(1569 extern int ncpu;) 91.7388 Tj
0 -218.3473 Td
(1570 ) 21.8426 Tj
0 -227.8407 Td
(1571 // Per-CPU variables, holding pointers to the) 218.4257 Tj
0 -237.334 Td
(1572 // current cpu and to the current process.) 205.3202 Tj
0 -246.8274 Td
(1573 // The __thread prefix tells gcc to refer to them in the s\
egment) 301.4275 Tj
0 -256.3207 Td
(1574 // pointed at by gs; the name __thread derives from the us\
e) 279.5849 Tj
0 -265.8141 Td
(1575 // of the same mechanism to provide per-thread storage in) 270.8479 Tj
0 -275.3075 Td
(1576 // multithreaded user programs.) 157.2665 Tj
0 -284.8008 Td
(1577 extern __thread struct cpu *c;       // This cpu.) 235.8998 Tj
0 -294.2942 Td
(1578 extern __thread struct proc *cp;     // Current process on\
 this cpu.) 318.9016 Tj
0 -303.7875 Td
(1579 ) 21.8426 Tj
0 -313.2809 Td
(1580 ) 21.8426 Tj
0 -322.7743 Td
(1581 ) 21.8426 Tj
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(1582 ) 21.8426 Tj
0 -341.761 Td
(1583 ) 21.8426 Tj
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(1584 ) 21.8426 Tj
0 -360.7477 Td
(1585 ) 21.8426 Tj
0 -370.2411 Td
(1586 ) 21.8426 Tj
0 -379.7344 Td
(1587 ) 21.8426 Tj
0 -389.2278 Td
(1588 ) 21.8426 Tj
0 -398.7211 Td
(1589 ) 21.8426 Tj
0 -408.2145 Td
(1590 ) 21.8426 Tj
0 -417.7079 Td
(1591 ) 21.8426 Tj
0 -427.2012 Td
(1592 ) 21.8426 Tj
0 -436.6946 Td
(1593 ) 21.8426 Tj
0 -446.1879 Td
(1594 ) 21.8426 Tj
0 -455.6813 Td
(1595 ) 21.8426 Tj
0 -465.1747 Td
(1596 ) 21.8426 Tj
0 -474.668 Td
(1597 ) 21.8426 Tj
0 -484.1614 Td
(1598 ) 21.8426 Tj
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(1599 ) 21.8426 Tj
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(Sheet 15) 34.9481 Tj
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(Aug  8 01:04 2009  xv6/proc.c  Page 1) 161.635 Tj
0 -28.4801 Td
(1600 #include "types.h") 100.4758 Tj
0 -37.9735 Td
(1601 #include "defs.h") 96.1073 Tj
0 -47.4668 Td
(1602 #include "param.h") 100.4758 Tj
0 -56.9602 Td
(1603 #include "mmu.h") 91.7388 Tj
0 -66.4535 Td
(1604 #include "x86.h") 91.7388 Tj
0 -75.9469 Td
(1605 #include "proc.h") 96.1073 Tj
0 -85.4403 Td
(1606 #include "spinlock.h") 113.5814 Tj
0 -94.9336 Td
(1607 ) 21.8426 Tj
0 -104.427 Td
(1608 struct {) 56.7907 Tj
0 -113.9203 Td
(1609   struct spinlock lock;) 122.3184 Tj
0 -123.4137 Td
(1610   struct proc proc[NPROC];) 135.4239 Tj
0 -132.9071 Td
(1611 } ptable;) 61.1592 Tj
0 -142.4004 Td
(1612 ) 21.8426 Tj
0 -151.8938 Td
(1613 static struct proc *initproc;) 148.5295 Tj
0 -161.3871 Td
(1614 ) 21.8426 Tj
0 -170.8805 Td
(1615 int nextpid = 1;) 91.7388 Tj
0 -180.3739 Td
(1616 extern void forkret\(void\);) 135.4239 Tj
0 -189.8672 Td
(1617 extern void trapret\(void\);) 135.4239 Tj
0 -199.3606 Td
(1618 ) 21.8426 Tj
0 -208.8539 Td
(1619 void) 39.3166 Tj
0 -218.3473 Td
(1620 pinit\(void\)) 69.8962 Tj
0 -227.8407 Td
(1621 {) 26.2111 Tj
0 -237.334 Td
(1622   initlock\(&ptable.lock, "ptable"\);) 174.7406 Tj
0 -246.8274 Td
(1623 }) 26.2111 Tj
0 -256.3207 Td
(1624 ) 21.8426 Tj
0 -265.8141 Td
(1625 ) 21.8426 Tj
0 -275.3075 Td
(1626 ) 21.8426 Tj
0 -284.8008 Td
(1627 ) 21.8426 Tj
0 -294.2942 Td
(1628 ) 21.8426 Tj
0 -303.7875 Td
(1629 ) 21.8426 Tj
0 -313.2809 Td
(1630 ) 21.8426 Tj
0 -322.7743 Td
(1631 ) 21.8426 Tj
0 -332.2676 Td
(1632 ) 21.8426 Tj
0 -341.761 Td
(1633 ) 21.8426 Tj
0 -351.2543 Td
(1634 ) 21.8426 Tj
0 -360.7477 Td
(1635 ) 21.8426 Tj
0 -370.2411 Td
(1636 ) 21.8426 Tj
0 -379.7344 Td
(1637 ) 21.8426 Tj
0 -389.2278 Td
(1638 ) 21.8426 Tj
0 -398.7211 Td
(1639 ) 21.8426 Tj
0 -408.2145 Td
(1640 ) 21.8426 Tj
0 -417.7079 Td
(1641 ) 21.8426 Tj
0 -427.2012 Td
(1642 ) 21.8426 Tj
0 -436.6946 Td
(1643 ) 21.8426 Tj
0 -446.1879 Td
(1644 ) 21.8426 Tj
0 -455.6813 Td
(1645 ) 21.8426 Tj
0 -465.1747 Td
(1646 ) 21.8426 Tj
0 -474.668 Td
(1647 ) 21.8426 Tj
0 -484.1614 Td
(1648 ) 21.8426 Tj
0 -493.6547 Td
(1649 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 16) 34.9481 Tj
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180 500 5760 3460 re
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[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/proc.c  Page 2) 161.635 Tj
0 -28.4801 Td
(1650 // Print a process listing to console.  For debugging.) 257.7424 Tj
0 -37.9735 Td
(1651 // Runs when user types ^P on console.) 187.8461 Tj
0 -47.4668 Td
(1652 // No lock to avoid wedging a stuck machine further.) 249.0053 Tj
0 -56.9602 Td
(1653 void) 39.3166 Tj
0 -66.4535 Td
(1654 procdump\(void\)) 83.0018 Tj
0 -75.9469 Td
(1655 {) 26.2111 Tj
0 -85.4403 Td
(1656   static char *states[] = {) 139.7925 Tj
0 -94.9336 Td
(1657   [UNUSED]    "unused",) 122.3184 Tj
0 -104.427 Td
(1658   [EMBRYO]    "embryo",) 122.3184 Tj
0 -113.9203 Td
(1659   [SLEEPING]  "sleep ",) 122.3184 Tj
0 -123.4137 Td
(1660   [RUNNABLE]  "runble",) 122.3184 Tj
0 -132.9071 Td
(1661   [RUNNING]   "run   ",) 122.3184 Tj
0 -142.4004 Td
(1662   [ZOMBIE]    "zombie") 117.9499 Tj
0 -151.8938 Td
(1663   };) 39.3166 Tj
0 -161.3871 Td
(1664   int i;) 56.7907 Tj
0 -170.8805 Td
(1665   struct proc *p;) 96.1073 Tj
0 -180.3739 Td
(1666   char *state;) 83.0018 Tj
0 -189.8672 Td
(1667   uint pc[10];) 83.0018 Tj
0 -199.3606 Td
(1668 ) 21.8426 Tj
0 -208.8539 Td
(1669   for\(p = ptable.proc; p < &ptable.proc[NPROC]; p++\){) 253.3738 Tj
0 -218.3473 Td
(1670     if\(p->state == UNUSED\)) 135.4239 Tj
0 -227.8407 Td
(1671       continue;) 87.3703 Tj
0 -237.334 Td
(1672     if\(p->state >= 0 && p->state < NELEM\(states\) && sta\
tes[p->state]\)) 323.2701 Tj
0 -246.8274 Td
(1673       state = states[p->state];) 157.2665 Tj
0 -256.3207 Td
(1674     else) 56.7907 Tj
0 -265.8141 Td
(1675       state = "???";) 109.2129 Tj
0 -275.3075 Td
(1676     cprintf\("%d %s %s", p->pid, state, p->name\);) 231.5313 Tj
0 -284.8008 Td
(1677     if\(p->state == SLEEPING\){) 148.5295 Tj
0 -294.2942 Td
(1678       getcallerpcs\(\(uint*\)p->context->ebp+2, pc\);) 235.8998 Tj
0 -303.7875 Td
(1679       for\(i=0; i<10 && pc[i] != 0; i++\)) 192.2146 Tj
0 -313.2809 Td
(1680         cprintf\(" %p", pc[i]\);) 152.898 Tj
0 -322.7743 Td
(1681     }) 43.6851 Tj
0 -332.2676 Td
(1682     cprintf\("\\n"\);) 100.4758 Tj
0 -341.761 Td
(1683   }) 34.9481 Tj
0 -351.2543 Td
(1684 }) 26.2111 Tj
0 -360.7477 Td
(1685 ) 21.8426 Tj
0 -370.2411 Td
(1686 ) 21.8426 Tj
0 -379.7344 Td
(1687 ) 21.8426 Tj
0 -389.2278 Td
(1688 ) 21.8426 Tj
0 -398.7211 Td
(1689 ) 21.8426 Tj
0 -408.2145 Td
(1690 ) 21.8426 Tj
0 -417.7079 Td
(1691 ) 21.8426 Tj
0 -427.2012 Td
(1692 ) 21.8426 Tj
0 -436.6946 Td
(1693 ) 21.8426 Tj
0 -446.1879 Td
(1694 ) 21.8426 Tj
0 -455.6813 Td
(1695 ) 21.8426 Tj
0 -465.1747 Td
(1696 ) 21.8426 Tj
0 -474.668 Td
(1697 ) 21.8426 Tj
0 -484.1614 Td
(1698 ) 21.8426 Tj
0 -493.6547 Td
(1699 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 16) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 24 24
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/proc.c  Page 3) 161.635 Tj
0 -28.4801 Td
(1700 // Set up CPU's kernel segment descriptors.) 209.6887 Tj
0 -37.9735 Td
(1701 // Run once at boot time on each CPU.) 183.4776 Tj
0 -47.4668 Td
(1702 void) 39.3166 Tj
0 -56.9602 Td
(1703 ksegment\(void\)) 83.0018 Tj
0 -66.4535 Td
(1704 {) 26.2111 Tj
0 -75.9469 Td
(1705   struct cpu *c1;) 96.1073 Tj
0 -85.4403 Td
(1706 ) 21.8426 Tj
0 -94.9336 Td
(1707   c1 = &cpus[cpu\(\)];) 109.2129 Tj
0 -104.427 Td
(1708   c1->gdt[SEG_KCODE] = SEG\(STA_X|STA_R, 0, 0x100000 + 64*\
1024-1, 0\);) 318.9016 Tj
0 -113.9203 Td
(1709   c1->gdt[SEG_KDATA] = SEG\(STA_W, 0, 0xffffffff, 0\);) 249.0053 Tj
0 -123.4137 Td
(1710   c1->gdt[SEG_KCPU] = SEG\(STA_W, \(uint\)\(&c1->tls+1\), \
0xffffffff, 0\);) 318.9016 Tj
0 -132.9071 Td
(1711   lgdt\(c1->gdt, sizeof\(c1->gdt\)\);) 166.0035 Tj
0 -142.4004 Td
(1712   loadfsgs\(SEG_KCPU << 3\);) 135.4239 Tj
0 -151.8938 Td
(1713 ) 21.8426 Tj
0 -161.3871 Td
(1714   // Initialize cpu-local variables.) 179.1091 Tj
0 -170.8805 Td
(1715   c = c1;) 61.1592 Tj
0 -180.3739 Td
(1716   cp = 0;) 61.1592 Tj
0 -189.8672 Td
(1717 }) 26.2111 Tj
0 -199.3606 Td
(1718 ) 21.8426 Tj
0 -208.8539 Td
(1719 // Set up CPU's segment descriptors and current process ta\
sk state.) 314.533 Tj
0 -218.3473 Td
(1720 // If cp==0, set up for "idle" state for when scheduler\(\)\
 is running.) 323.2701 Tj
0 -227.8407 Td
(1721 void) 39.3166 Tj
0 -237.334 Td
(1722 usegment\(void\)) 83.0018 Tj
0 -246.8274 Td
(1723 {) 26.2111 Tj
0 -256.3207 Td
(1724   pushcli\(\);) 74.2647 Tj
0 -265.8141 Td
(1725   c->gdt[SEG_UCODE] = SEG\(STA_X|STA_R, \(uint\)cp->mem, c\
p->sz-1, DPL_USER\);) 345.1126 Tj
0 -275.3075 Td
(1726   c->gdt[SEG_UDATA] = SEG\(STA_W, \(uint\)cp->mem, cp->sz-\
1, DPL_USER\);) 318.9016 Tj
0 -284.8008 Td
(1727   c->gdt[SEG_TSS] = SEG16\(STS_T32A, \(uint\)&c->ts, sizeo\
f\(c->ts\)-1, 0\);) 327.6386 Tj
0 -294.2942 Td
(1728   c->gdt[SEG_TSS].s = 0;) 126.6869 Tj
0 -303.7875 Td
(1729   c->ts.ss0 = SEG_KDATA << 3;) 148.5295 Tj
0 -313.2809 Td
(1730   c->ts.esp0 = \(uint\)cp->kstack + KSTACKSIZE;) 218.4257 Tj
0 -322.7743 Td
(1731   ltr\(SEG_TSS << 3\);) 109.2129 Tj
0 -332.2676 Td
(1732   popcli\(\);) 69.8962 Tj
0 -341.761 Td
(1733 }) 26.2111 Tj
0 -351.2543 Td
(1734 ) 21.8426 Tj
0 -360.7477 Td
(1735 ) 21.8426 Tj
0 -370.2411 Td
(1736 ) 21.8426 Tj
0 -379.7344 Td
(1737 ) 21.8426 Tj
0 -389.2278 Td
(1738 ) 21.8426 Tj
0 -398.7211 Td
(1739 ) 21.8426 Tj
0 -408.2145 Td
(1740 ) 21.8426 Tj
0 -417.7079 Td
(1741 ) 21.8426 Tj
0 -427.2012 Td
(1742 ) 21.8426 Tj
0 -436.6946 Td
(1743 ) 21.8426 Tj
0 -446.1879 Td
(1744 ) 21.8426 Tj
0 -455.6813 Td
(1745 ) 21.8426 Tj
0 -465.1747 Td
(1746 ) 21.8426 Tj
0 -474.668 Td
(1747 ) 21.8426 Tj
0 -484.1614 Td
(1748 ) 21.8426 Tj
0 -493.6547 Td
(1749 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 17) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/proc.c  Page 4) 161.635 Tj
0 -28.4801 Td
(1750 // Look in the process table for an UNUSED proc.) 231.5313 Tj
0 -37.9735 Td
(1751 // If found, change state to EMBRYO and return it.) 240.2683 Tj
0 -47.4668 Td
(1752 // Otherwise return 0.) 117.9499 Tj
0 -56.9602 Td
(1753 static struct proc*) 104.8443 Tj
0 -66.4535 Td
(1754 allocproc\(void\)) 87.3703 Tj
0 -75.9469 Td
(1755 {) 26.2111 Tj
0 -85.4403 Td
(1756   struct proc *p;) 96.1073 Tj
0 -94.9336 Td
(1757   char *sp;) 69.8962 Tj
0 -104.427 Td
(1758 ) 21.8426 Tj
0 -113.9203 Td
(1759   acquire\(&ptable.lock\);) 126.6869 Tj
0 -123.4137 Td
(1760   for\(p = ptable.proc; p < &ptable.proc[NPROC]; p++\)) 249.0053 Tj
0 -132.9071 Td
(1761     if\(p->state == UNUSED\)) 135.4239 Tj
0 -142.4004 Td
(1762       goto found;) 96.1073 Tj
0 -151.8938 Td
(1763   release\(&ptable.lock\);) 126.6869 Tj
0 -161.3871 Td
(1764   return 0;) 69.8962 Tj
0 -170.8805 Td
(1765 ) 21.8426 Tj
0 -180.3739 Td
(1766 found:) 48.0537 Tj
0 -189.8672 Td
(1767   p->state = EMBRYO;) 109.2129 Tj
0 -199.3606 Td
(1768   p->pid = nextpid++;) 113.5814 Tj
0 -208.8539 Td
(1769   release\(&ptable.lock\);) 126.6869 Tj
0 -218.3473 Td
(1770 ) 21.8426 Tj
0 -227.8407 Td
(1771   // Allocate kernel stack if necessary.) 196.5831 Tj
0 -237.334 Td
(1772   if\(\(p->kstack = kalloc\(KSTACKSIZE\)\) == 0\){) 214.0572 Tj
0 -246.8274 Td
(1773     p->state = UNUSED;) 117.9499 Tj
0 -256.3207 Td
(1774     return 0;) 78.6333 Tj
0 -265.8141 Td
(1775   }) 34.9481 Tj
0 -275.3075 Td
(1776   sp = p->kstack + KSTACKSIZE;) 152.898 Tj
0 -284.8008 Td
(1777 ) 21.8426 Tj
0 -294.2942 Td
(1778   // Leave room for trap frame.) 157.2665 Tj
0 -303.7875 Td
(1779   sp -= sizeof *p->tf;) 117.9499 Tj
0 -313.2809 Td
(1780   p->tf = \(struct trapframe*\)sp;) 161.635 Tj
0 -322.7743 Td
(1781 ) 21.8426 Tj
0 -332.2676 Td
(1782   // Set up new context to start executing at forkret,) 257.7424 Tj
0 -341.761 Td
(1783   // which returns to trapret \(see below\).) 205.3202 Tj
0 -351.2543 Td
(1784   sp -= 4;) 65.5277 Tj
0 -360.7477 Td
(1785   *\(uint*\)sp = \(uint\)trapret;) 148.5295 Tj
0 -370.2411 Td
(1786 ) 21.8426 Tj
0 -379.7344 Td
(1787   sp -= sizeof *p->context;) 139.7925 Tj
0 -389.2278 Td
(1788   p->context = \(struct context*\)sp;) 174.7406 Tj
0 -398.7211 Td
(1789   memset\(p->context, 0, sizeof *p->context\);) 214.0572 Tj
0 -408.2145 Td
(1790   p->context->eip = \(uint\)forkret;) 170.3721 Tj
0 -417.7079 Td
(1791   return p;) 69.8962 Tj
0 -427.2012 Td
(1792 }) 26.2111 Tj
0 -436.6946 Td
(1793 ) 21.8426 Tj
0 -446.1879 Td
(1794 ) 21.8426 Tj
0 -455.6813 Td
(1795 ) 21.8426 Tj
0 -465.1747 Td
(1796 ) 21.8426 Tj
0 -474.668 Td
(1797 ) 21.8426 Tj
0 -484.1614 Td
(1798 ) 21.8426 Tj
0 -493.6547 Td
(1799 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 17) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 25 25
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/proc.c  Page 5) 161.635 Tj
0 -28.4801 Td
(1800 // Set up first user process.) 148.5295 Tj
0 -37.9735 Td
(1801 void) 39.3166 Tj
0 -47.4668 Td
(1802 userinit\(void\)) 83.0018 Tj
0 -56.9602 Td
(1803 {) 26.2111 Tj
0 -66.4535 Td
(1804   struct proc *p;) 96.1073 Tj
0 -75.9469 Td
(1805   extern char _binary_initcode_start[], _binary_initcode_s\
ize[];) 301.4275 Tj
0 -85.4403 Td
(1806 ) 21.8426 Tj
0 -94.9336 Td
(1807   p = allocproc\(\);) 100.4758 Tj
0 -104.427 Td
(1808   initproc = p;) 87.3703 Tj
0 -113.9203 Td
(1809 ) 21.8426 Tj
0 -123.4137 Td
(1810   // Initialize memory from initcode.S) 187.8461 Tj
0 -132.9071 Td
(1811   p->sz = PAGE;) 87.3703 Tj
0 -142.4004 Td
(1812   p->mem = kalloc\(p->sz\);) 131.0554 Tj
0 -151.8938 Td
(1813   memset\(p->mem, 0, p->sz\);) 139.7925 Tj
0 -161.3871 Td
(1814   memmove\(p->mem, _binary_initcode_start, \(int\)_binary_\
initcode_size\);) 327.6386 Tj
0 -170.8805 Td
(1815 ) 21.8426 Tj
0 -180.3739 Td
(1816   memset\(p->tf, 0, sizeof\(*p->tf\)\);) 174.7406 Tj
0 -189.8672 Td
(1817   p->tf->cs = \(SEG_UCODE << 3\) | DPL_USER;) 205.3202 Tj
0 -199.3606 Td
(1818   p->tf->ds = \(SEG_UDATA << 3\) | DPL_USER;) 205.3202 Tj
0 -208.8539 Td
(1819   p->tf->es = p->tf->ds;) 126.6869 Tj
0 -218.3473 Td
(1820   p->tf->ss = p->tf->ds;) 126.6869 Tj
0 -227.8407 Td
(1821   p->tf->eflags = FL_IF;) 126.6869 Tj
0 -237.334 Td
(1822   p->tf->esp = p->sz;) 113.5814 Tj
0 -246.8274 Td
(1823   p->tf->eip = 0;  // beginning of initcode.S) 218.4257 Tj
0 -256.3207 Td
(1824 ) 21.8426 Tj
0 -265.8141 Td
(1825   safestrcpy\(p->name, "initcode", sizeof\(p->name\)\);) 244.6368 Tj
0 -275.3075 Td
(1826   p->cwd = namei\("/"\);) 117.9499 Tj
0 -284.8008 Td
(1827 ) 21.8426 Tj
0 -294.2942 Td
(1828   p->state = RUNNABLE;) 117.9499 Tj
0 -303.7875 Td
(1829 }) 26.2111 Tj
0 -313.2809 Td
(1830 ) 21.8426 Tj
0 -322.7743 Td
(1831 // Grow current process's memory by n bytes.) 214.0572 Tj
0 -332.2676 Td
(1832 // Return 0 on success, -1 on failure.) 187.8461 Tj
0 -341.761 Td
(1833 int) 34.9481 Tj
0 -351.2543 Td
(1834 growproc\(int n\)) 87.3703 Tj
0 -360.7477 Td
(1835 {) 26.2111 Tj
0 -370.2411 Td
(1836   char *newmem;) 87.3703 Tj
0 -379.7344 Td
(1837 ) 21.8426 Tj
0 -389.2278 Td
(1838   newmem = kalloc\(cp->sz + n\);) 152.898 Tj
0 -398.7211 Td
(1839   if\(newmem == 0\)) 96.1073 Tj
0 -408.2145 Td
(1840     return -1;) 83.0018 Tj
0 -417.7079 Td
(1841   memmove\(newmem, cp->mem, cp->sz\);) 174.7406 Tj
0 -427.2012 Td
(1842   memset\(newmem + cp->sz, 0, n\);) 161.635 Tj
0 -436.6946 Td
(1843   kfree\(cp->mem, cp->sz\);) 131.0554 Tj
0 -446.1879 Td
(1844   cp->mem = newmem;) 104.8443 Tj
0 -455.6813 Td
(1845   cp->sz += n;) 83.0018 Tj
0 -465.1747 Td
(1846   usegment\(\);) 78.6333 Tj
0 -474.668 Td
(1847   return 0;) 69.8962 Tj
0 -484.1614 Td
(1848 }) 26.2111 Tj
0 -493.6547 Td
(1849 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 18) 34.9481 Tj
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(Aug  8 01:04 2009  xv6/proc.c  Page 6) 161.635 Tj
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(1850 // Create a new process copying p as the parent.) 231.5313 Tj
0 -37.9735 Td
(1851 // Sets up stack to return as if from system call.) 240.2683 Tj
0 -47.4668 Td
(1852 // Caller must set state of returned proc to RUNNABLE.) 257.7424 Tj
0 -56.9602 Td
(1853 int) 34.9481 Tj
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(1854 fork\(void\)) 65.5277 Tj
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(1855 {) 26.2111 Tj
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(1856   int i, pid;) 78.6333 Tj
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(1857   struct proc *np;) 100.4758 Tj
0 -104.427 Td
(1858 ) 21.8426 Tj
0 -113.9203 Td
(1859   // Allocate process.) 117.9499 Tj
0 -123.4137 Td
(1860   if\(\(np = allocproc\(\)\) == 0\)) 148.5295 Tj
0 -132.9071 Td
(1861     return -1;) 83.0018 Tj
0 -142.4004 Td
(1862 ) 21.8426 Tj
0 -151.8938 Td
(1863   // Copy process state from p.) 157.2665 Tj
0 -161.3871 Td
(1864   np->sz = cp->sz;) 100.4758 Tj
0 -170.8805 Td
(1865   if\(\(np->mem = kalloc\(np->sz\)\) == 0\){) 187.8461 Tj
0 -180.3739 Td
(1866     kfree\(np->kstack, KSTACKSIZE\);) 170.3721 Tj
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(1867     np->kstack = 0;) 104.8443 Tj
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(1868     np->state = UNUSED;) 122.3184 Tj
0 -208.8539 Td
(1869     return -1;) 83.0018 Tj
0 -218.3473 Td
(1870   }) 34.9481 Tj
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(1871   memmove\(np->mem, cp->mem, np->sz\);) 179.1091 Tj
0 -237.334 Td
(1872   np->parent = cp;) 100.4758 Tj
0 -246.8274 Td
(1873   *np->tf = *cp->tf;) 109.2129 Tj
0 -256.3207 Td
(1874 ) 21.8426 Tj
0 -265.8141 Td
(1875   // Clear %eax so that fork returns 0 in the child.) 249.0053 Tj
0 -275.3075 Td
(1876   np->tf->eax = 0;) 100.4758 Tj
0 -284.8008 Td
(1877 ) 21.8426 Tj
0 -294.2942 Td
(1878   for\(i = 0; i < NOFILE; i++\)) 148.5295 Tj
0 -303.7875 Td
(1879     if\(cp->ofile[i]\)) 109.2129 Tj
0 -313.2809 Td
(1880       np->ofile[i] = filedup\(cp->ofile[i]\);) 209.6887 Tj
0 -322.7743 Td
(1881   np->cwd = idup\(cp->cwd\);) 135.4239 Tj
0 -332.2676 Td
(1882 ) 21.8426 Tj
0 -341.761 Td
(1883   pid = np->pid;) 91.7388 Tj
0 -351.2543 Td
(1884   np->state = RUNNABLE;) 122.3184 Tj
0 -360.7477 Td
(1885 ) 21.8426 Tj
0 -370.2411 Td
(1886   return pid;) 78.6333 Tj
0 -379.7344 Td
(1887 }) 26.2111 Tj
0 -389.2278 Td
(1888 ) 21.8426 Tj
0 -398.7211 Td
(1889 ) 21.8426 Tj
0 -408.2145 Td
(1890 ) 21.8426 Tj
0 -417.7079 Td
(1891 ) 21.8426 Tj
0 -427.2012 Td
(1892 ) 21.8426 Tj
0 -436.6946 Td
(1893 ) 21.8426 Tj
0 -446.1879 Td
(1894 ) 21.8426 Tj
0 -455.6813 Td
(1895 ) 21.8426 Tj
0 -465.1747 Td
(1896 ) 21.8426 Tj
0 -474.668 Td
(1897 ) 21.8426 Tj
0 -484.1614 Td
(1898 ) 21.8426 Tj
0 -493.6547 Td
(1899 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 18) 34.9481 Tj
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(Aug  8 01:04 2009  xv6/proc.c  Page 7) 161.635 Tj
0 -28.4801 Td
(1900 // Per-CPU process scheduler.) 148.5295 Tj
0 -37.9735 Td
(1901 // Each CPU calls scheduler\(\) after setting itself up.) 257.7424 Tj
0 -47.4668 Td
(1902 // Scheduler never returns.  It loops, doing:) 218.4257 Tj
0 -56.9602 Td
(1903 //  - choose a process to run) 148.5295 Tj
0 -66.4535 Td
(1904 //  - swtch to start running that process) 200.9517 Tj
0 -75.9469 Td
(1905 //  - eventually that process transfers control) 227.1628 Tj
0 -85.4403 Td
(1906 //      via swtch back to the scheduler.) 196.5831 Tj
0 -94.9336 Td
(1907 void) 39.3166 Tj
0 -104.427 Td
(1908 scheduler\(void\)) 87.3703 Tj
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(1909 {) 26.2111 Tj
0 -123.4137 Td
(1910   struct proc *p;) 96.1073 Tj
0 -132.9071 Td
(1911 ) 21.8426 Tj
0 -142.4004 Td
(1912   for\(;;\){) 65.5277 Tj
0 -151.8938 Td
(1913     // Enable interrupts on this processor.) 209.6887 Tj
0 -161.3871 Td
(1914     sti\(\);) 65.5277 Tj
0 -170.8805 Td
(1915 ) 21.8426 Tj
0 -180.3739 Td
(1916     // Loop over process table looking for process to run.) 275.2164 Tj
0 -189.8672 Td
(1917     acquire\(&ptable.lock\);) 135.4239 Tj
0 -199.3606 Td
(1918     for\(p = ptable.proc; p < &ptable.proc[NPROC]; p++\){) 262.1109 Tj
0 -208.8539 Td
(1919       if\(p->state != RUNNABLE\)) 152.898 Tj
0 -218.3473 Td
(1920         continue;) 96.1073 Tj
0 -227.8407 Td
(1921 ) 21.8426 Tj
0 -237.334 Td
(1922       // Switch to chosen process.  It is the process's jo\
b) 279.5849 Tj
0 -246.8274 Td
(1923       // to release ptable.lock and then reacquire it) 253.3738 Tj
0 -256.3207 Td
(1924       // before jumping back to us.) 174.7406 Tj
0 -265.8141 Td
(1925       cp = p;) 78.6333 Tj
0 -275.3075 Td
(1926       usegment\(\);) 96.1073 Tj
0 -284.8008 Td
(1927       p->state = RUNNING;) 131.0554 Tj
0 -294.2942 Td
(1928       swtch\(&c->context, p->context\);) 183.4776 Tj
0 -303.7875 Td
(1929 ) 21.8426 Tj
0 -313.2809 Td
(1930       // Process is done running for now.) 200.9517 Tj
0 -322.7743 Td
(1931       // It should have changed its p->state before coming\
 back.) 301.4275 Tj
0 -332.2676 Td
(1932       cp = 0;) 78.6333 Tj
0 -341.761 Td
(1933     }) 43.6851 Tj
0 -351.2543 Td
(1934     release\(&ptable.lock\);) 135.4239 Tj
0 -360.7477 Td
(1935 ) 21.8426 Tj
0 -370.2411 Td
(1936   }) 34.9481 Tj
0 -379.7344 Td
(1937 }) 26.2111 Tj
0 -389.2278 Td
(1938 ) 21.8426 Tj
0 -398.7211 Td
(1939 ) 21.8426 Tj
0 -408.2145 Td
(1940 ) 21.8426 Tj
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(1941 ) 21.8426 Tj
0 -427.2012 Td
(1942 ) 21.8426 Tj
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(1943 ) 21.8426 Tj
0 -446.1879 Td
(1944 ) 21.8426 Tj
0 -455.6813 Td
(1945 ) 21.8426 Tj
0 -465.1747 Td
(1946 ) 21.8426 Tj
0 -474.668 Td
(1947 ) 21.8426 Tj
0 -484.1614 Td
(1948 ) 21.8426 Tj
0 -493.6547 Td
(1949 ) 21.8426 Tj
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(Sheet 19) 34.9481 Tj
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(Aug  8 01:04 2009  xv6/proc.c  Page 8) 161.635 Tj
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(1950 // Enter scheduler.  Must hold only ptable.lock) 227.1628 Tj
0 -37.9735 Td
(1951 // and have changed cp->state.) 152.898 Tj
0 -47.4668 Td
(1952 void) 39.3166 Tj
0 -56.9602 Td
(1953 sched\(void\)) 69.8962 Tj
0 -66.4535 Td
(1954 {) 26.2111 Tj
0 -75.9469 Td
(1955   int intena;) 78.6333 Tj
0 -85.4403 Td
(1956 ) 21.8426 Tj
0 -94.9336 Td
(1957   if\(!holding\(&ptable.lock\)\)) 144.161 Tj
0 -104.427 Td
(1958     panic\("sched ptable.lock"\);) 157.2665 Tj
0 -113.9203 Td
(1959   if\(c->ncli != 1\)) 100.4758 Tj
0 -123.4137 Td
(1960     panic\("sched locks"\);) 131.0554 Tj
0 -132.9071 Td
(1961   if\(cp->state == RUNNING\)) 135.4239 Tj
0 -142.4004 Td
(1962     panic\("sched running"\);) 139.7925 Tj
0 -151.8938 Td
(1963   if\(readeflags\(\)&FL_IF\)) 126.6869 Tj
0 -161.3871 Td
(1964     panic\("sched interruptible"\);) 166.0035 Tj
0 -170.8805 Td
(1965 ) 21.8426 Tj
0 -180.3739 Td
(1966   intena = c->intena;) 113.5814 Tj
0 -189.8672 Td
(1967   swtch\(&cp->context, c->context\);) 170.3721 Tj
0 -199.3606 Td
(1968   c->intena = intena;) 113.5814 Tj
0 -208.8539 Td
(1969 }) 26.2111 Tj
0 -218.3473 Td
(1970 ) 21.8426 Tj
0 -227.8407 Td
(1971 // Give up the CPU for one scheduling round.) 214.0572 Tj
0 -237.334 Td
(1972 void) 39.3166 Tj
0 -246.8274 Td
(1973 yield\(void\)) 69.8962 Tj
0 -256.3207 Td
(1974 {) 26.2111 Tj
0 -265.8141 Td
(1975   acquire\(&ptable.lock\);  ) 135.4239 Tj
0 -275.3075 Td
(1976   cp->state = RUNNABLE;) 122.3184 Tj
0 -284.8008 Td
(1977   sched\(\);) 65.5277 Tj
0 -294.2942 Td
(1978   release\(&ptable.lock\);) 126.6869 Tj
0 -303.7875 Td
(1979 }) 26.2111 Tj
0 -313.2809 Td
(1980 ) 21.8426 Tj
0 -322.7743 Td
(1981 // A fork child's very first scheduling by scheduler\(\)) 257.7424 Tj
0 -332.2676 Td
(1982 // will swtch here.  "Return" to user space.) 214.0572 Tj
0 -341.761 Td
(1983 void) 39.3166 Tj
0 -351.2543 Td
(1984 forkret\(void\)) 78.6333 Tj
0 -360.7477 Td
(1985 {) 26.2111 Tj
0 -370.2411 Td
(1986   // Still holding ptable.lock from scheduler.) 222.7942 Tj
0 -379.7344 Td
(1987   release\(&ptable.lock\);) 126.6869 Tj
0 -389.2278 Td
(1988 ) 21.8426 Tj
0 -398.7211 Td
(1989   // Return to "caller", actually trapret \(see allocproc\)\
.) 275.2164 Tj
0 -408.2145 Td
(1990 }) 26.2111 Tj
0 -417.7079 Td
(1991 ) 21.8426 Tj
0 -427.2012 Td
(1992 ) 21.8426 Tj
0 -436.6946 Td
(1993 ) 21.8426 Tj
0 -446.1879 Td
(1994 ) 21.8426 Tj
0 -455.6813 Td
(1995 ) 21.8426 Tj
0 -465.1747 Td
(1996 ) 21.8426 Tj
0 -474.668 Td
(1997 ) 21.8426 Tj
0 -484.1614 Td
(1998 ) 21.8426 Tj
0 -493.6547 Td
(1999 ) 21.8426 Tj
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(Sheet 19) 34.9481 Tj
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(Aug  8 01:04 2009  xv6/proc.c  Page 9) 161.635 Tj
0 -28.4801 Td
(2000 // Atomically release lock and sleep on chan.) 218.4257 Tj
0 -37.9735 Td
(2001 // Reacquires lock when reawakened.) 174.7406 Tj
0 -47.4668 Td
(2002 void) 39.3166 Tj
0 -56.9602 Td
(2003 sleep\(void *chan, struct spinlock *lk\)) 187.8461 Tj
0 -66.4535 Td
(2004 {) 26.2111 Tj
0 -75.9469 Td
(2005   if\(cp == 0\)) 78.6333 Tj
0 -85.4403 Td
(2006     panic\("sleep"\);) 104.8443 Tj
0 -94.9336 Td
(2007 ) 21.8426 Tj
0 -104.427 Td
(2008   if\(lk == 0\)) 78.6333 Tj
0 -113.9203 Td
(2009     panic\("sleep without lk"\);) 152.898 Tj
0 -123.4137 Td
(2010 ) 21.8426 Tj
0 -132.9071 Td
(2011   // Must acquire ptable.lock in order to) 200.9517 Tj
0 -142.4004 Td
(2012   // change p->state and then call sched.) 200.9517 Tj
0 -151.8938 Td
(2013   // Once we hold ptable.lock, we can be) 196.5831 Tj
0 -161.3871 Td
(2014   // guaranteed that we won't miss any wakeup) 218.4257 Tj
0 -170.8805 Td
(2015   // \(wakeup runs with ptable.lock locked\),) 209.6887 Tj
0 -180.3739 Td
(2016   // so it's okay to release lk.) 161.635 Tj
0 -189.8672 Td
(2017   if\(lk != &ptable.lock\){  ) 139.7925 Tj
0 -199.3606 Td
(2018     acquire\(&ptable.lock\);  ) 144.161 Tj
0 -208.8539 Td
(2019     release\(lk\);) 91.7388 Tj
0 -218.3473 Td
(2020   }) 34.9481 Tj
0 -227.8407 Td
(2021 ) 21.8426 Tj
0 -237.334 Td
(2022   // Go to sleep.) 96.1073 Tj
0 -246.8274 Td
(2023   cp->chan = chan;) 100.4758 Tj
0 -256.3207 Td
(2024   cp->state = SLEEPING;) 122.3184 Tj
0 -265.8141 Td
(2025   sched\(\);) 65.5277 Tj
0 -275.3075 Td
(2026 ) 21.8426 Tj
0 -284.8008 Td
(2027   // Tidy up.) 78.6333 Tj
0 -294.2942 Td
(2028   cp->chan = 0;) 87.3703 Tj
0 -303.7875 Td
(2029 ) 21.8426 Tj
0 -313.2809 Td
(2030   // Reacquire original lock.) 148.5295 Tj
0 -322.7743 Td
(2031   if\(lk != &ptable.lock\){  ) 139.7925 Tj
0 -332.2676 Td
(2032     release\(&ptable.lock\);) 135.4239 Tj
0 -341.761 Td
(2033     acquire\(lk\);) 91.7388 Tj
0 -351.2543 Td
(2034   }) 34.9481 Tj
0 -360.7477 Td
(2035 }) 26.2111 Tj
0 -370.2411 Td
(2036 ) 21.8426 Tj
0 -379.7344 Td
(2037 ) 21.8426 Tj
0 -389.2278 Td
(2038 ) 21.8426 Tj
0 -398.7211 Td
(2039 ) 21.8426 Tj
0 -408.2145 Td
(2040 ) 21.8426 Tj
0 -417.7079 Td
(2041 ) 21.8426 Tj
0 -427.2012 Td
(2042 ) 21.8426 Tj
0 -436.6946 Td
(2043 ) 21.8426 Tj
0 -446.1879 Td
(2044 ) 21.8426 Tj
0 -455.6813 Td
(2045 ) 21.8426 Tj
0 -465.1747 Td
(2046 ) 21.8426 Tj
0 -474.668 Td
(2047 ) 21.8426 Tj
0 -484.1614 Td
(2048 ) 21.8426 Tj
0 -493.6547 Td
(2049 ) 21.8426 Tj
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(Sheet 20) 34.9481 Tj
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(Aug  8 01:04 2009  xv6/proc.c  Page 10) 166.0035 Tj
0 -28.4801 Td
(2050 // Wake up all processes sleeping on chan.) 205.3202 Tj
0 -37.9735 Td
(2051 // The ptable lock must be held.) 161.635 Tj
0 -47.4668 Td
(2052 static void) 69.8962 Tj
0 -56.9602 Td
(2053 wakeup1\(void *chan\)) 104.8443 Tj
0 -66.4535 Td
(2054 {) 26.2111 Tj
0 -75.9469 Td
(2055   struct proc *p;) 96.1073 Tj
0 -85.4403 Td
(2056 ) 21.8426 Tj
0 -94.9336 Td
(2057   for\(p = ptable.proc; p < &ptable.proc[NPROC]; p++\)) 249.0053 Tj
0 -104.427 Td
(2058     if\(p->state == SLEEPING && p->chan == chan\)) 227.1628 Tj
0 -113.9203 Td
(2059       p->state = RUNNABLE;) 135.4239 Tj
0 -123.4137 Td
(2060 }) 26.2111 Tj
0 -132.9071 Td
(2061 ) 21.8426 Tj
0 -142.4004 Td
(2062 // Wake up all processes sleeping on chan.) 205.3202 Tj
0 -151.8938 Td
(2063 void) 39.3166 Tj
0 -161.3871 Td
(2064 wakeup\(void *chan\)) 100.4758 Tj
0 -170.8805 Td
(2065 {) 26.2111 Tj
0 -180.3739 Td
(2066   acquire\(&ptable.lock\);) 126.6869 Tj
0 -189.8672 Td
(2067   wakeup1\(chan\);) 91.7388 Tj
0 -199.3606 Td
(2068   release\(&ptable.lock\);) 126.6869 Tj
0 -208.8539 Td
(2069 }) 26.2111 Tj
0 -218.3473 Td
(2070 ) 21.8426 Tj
0 -227.8407 Td
(2071 // Kill the process with the given pid.) 192.2146 Tj
0 -237.334 Td
(2072 // Process won't actually exit until it returns) 227.1628 Tj
0 -246.8274 Td
(2073 // to user space \(see trap in trap.c\).) 187.8461 Tj
0 -256.3207 Td
(2074 int) 34.9481 Tj
0 -265.8141 Td
(2075 kill\(int pid\)) 78.6333 Tj
0 -275.3075 Td
(2076 {) 26.2111 Tj
0 -284.8008 Td
(2077   struct proc *p;) 96.1073 Tj
0 -294.2942 Td
(2078 ) 21.8426 Tj
0 -303.7875 Td
(2079   acquire\(&ptable.lock\);) 126.6869 Tj
0 -313.2809 Td
(2080   for\(p = ptable.proc; p < &ptable.proc[NPROC]; p++\){) 253.3738 Tj
0 -322.7743 Td
(2081     if\(p->pid == pid\){) 117.9499 Tj
0 -332.2676 Td
(2082       p->killed = 1;) 109.2129 Tj
0 -341.761 Td
(2083       // Wake process from sleep if necessary.) 222.7942 Tj
0 -351.2543 Td
(2084       if\(p->state == SLEEPING\)) 152.898 Tj
0 -360.7477 Td
(2085         p->state = RUNNABLE;) 144.161 Tj
0 -370.2411 Td
(2086       release\(&ptable.lock\);) 144.161 Tj
0 -379.7344 Td
(2087       return 0;) 87.3703 Tj
0 -389.2278 Td
(2088     }) 43.6851 Tj
0 -398.7211 Td
(2089   }) 34.9481 Tj
0 -408.2145 Td
(2090   release\(&ptable.lock\);) 126.6869 Tj
0 -417.7079 Td
(2091   return -1;) 74.2647 Tj
0 -427.2012 Td
(2092 }) 26.2111 Tj
0 -436.6946 Td
(2093 ) 21.8426 Tj
0 -446.1879 Td
(2094 ) 21.8426 Tj
0 -455.6813 Td
(2095 ) 21.8426 Tj
0 -465.1747 Td
(2096 ) 21.8426 Tj
0 -474.668 Td
(2097 ) 21.8426 Tj
0 -484.1614 Td
(2098 ) 21.8426 Tj
0 -493.6547 Td
(2099 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 20) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 28 28
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
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1 w
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[0] sc
/DeviceGray {} CS
[0] SC
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0 0 612 792 re
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[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
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[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/proc.c  Page 11) 166.0035 Tj
0 -28.4801 Td
(2100 // Exit the current process.  Does not return.) 222.7942 Tj
0 -37.9735 Td
(2101 // Exited processes remain in the zombie state) 222.7942 Tj
0 -47.4668 Td
(2102 // until their parent calls wait\(\) to find out they exit\
ed.) 279.5849 Tj
0 -56.9602 Td
(2103 void) 39.3166 Tj
0 -66.4535 Td
(2104 exit\(void\)) 65.5277 Tj
0 -75.9469 Td
(2105 {) 26.2111 Tj
0 -85.4403 Td
(2106   struct proc *p;) 96.1073 Tj
0 -94.9336 Td
(2107   int fd;) 61.1592 Tj
0 -104.427 Td
(2108 ) 21.8426 Tj
0 -113.9203 Td
(2109   if\(cp == initproc\)) 109.2129 Tj
0 -123.4137 Td
(2110     panic\("init exiting"\);) 135.4239 Tj
0 -132.9071 Td
(2111 ) 21.8426 Tj
0 -142.4004 Td
(2112   // Close all open files.) 135.4239 Tj
0 -151.8938 Td
(2113   for\(fd = 0; fd < NOFILE; fd++\){) 166.0035 Tj
0 -161.3871 Td
(2114     if\(cp->ofile[fd]\){) 117.9499 Tj
0 -170.8805 Td
(2115       fileclose\(cp->ofile[fd]\);) 157.2665 Tj
0 -180.3739 Td
(2116       cp->ofile[fd] = 0;) 126.6869 Tj
0 -189.8672 Td
(2117     }) 43.6851 Tj
0 -199.3606 Td
(2118   }) 34.9481 Tj
0 -208.8539 Td
(2119 ) 21.8426 Tj
0 -218.3473 Td
(2120   iput\(cp->cwd\);) 91.7388 Tj
0 -227.8407 Td
(2121   cp->cwd = 0;) 83.0018 Tj
0 -237.334 Td
(2122 ) 21.8426 Tj
0 -246.8274 Td
(2123   acquire\(&ptable.lock\);) 126.6869 Tj
0 -256.3207 Td
(2124 ) 21.8426 Tj
0 -265.8141 Td
(2125   // Parent might be sleeping in wait\(\).) 196.5831 Tj
0 -275.3075 Td
(2126   wakeup1\(cp->parent\);) 117.9499 Tj
0 -284.8008 Td
(2127 ) 21.8426 Tj
0 -294.2942 Td
(2128   // Pass abandoned children to init.) 183.4776 Tj
0 -303.7875 Td
(2129   for\(p = ptable.proc; p < &ptable.proc[NPROC]; p++\){) 253.3738 Tj
0 -313.2809 Td
(2130     if\(p->parent == cp\){) 126.6869 Tj
0 -322.7743 Td
(2131       p->parent = initproc;) 139.7925 Tj
0 -332.2676 Td
(2132       if\(p->state == ZOMBIE\)) 144.161 Tj
0 -341.761 Td
(2133         wakeup1\(initproc\);) 135.4239 Tj
0 -351.2543 Td
(2134     }) 43.6851 Tj
0 -360.7477 Td
(2135   }) 34.9481 Tj
0 -370.2411 Td
(2136 ) 21.8426 Tj
0 -379.7344 Td
(2137   // Jump into the scheduler, never to return.) 222.7942 Tj
0 -389.2278 Td
(2138   cp->state = ZOMBIE;) 113.5814 Tj
0 -398.7211 Td
(2139   sched\(\);) 65.5277 Tj
0 -408.2145 Td
(2140   panic\("zombie exit"\);) 122.3184 Tj
0 -417.7079 Td
(2141 }) 26.2111 Tj
0 -427.2012 Td
(2142 ) 21.8426 Tj
0 -436.6946 Td
(2143 ) 21.8426 Tj
0 -446.1879 Td
(2144 ) 21.8426 Tj
0 -455.6813 Td
(2145 ) 21.8426 Tj
0 -465.1747 Td
(2146 ) 21.8426 Tj
0 -474.668 Td
(2147 ) 21.8426 Tj
0 -484.1614 Td
(2148 ) 21.8426 Tj
0 -493.6547 Td
(2149 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 21) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/proc.c  Page 12) 166.0035 Tj
0 -28.4801 Td
(2150 // Wait for a child process to exit and return its pid.) 262.1109 Tj
0 -37.9735 Td
(2151 // Return -1 if this process has no children.) 218.4257 Tj
0 -47.4668 Td
(2152 int) 34.9481 Tj
0 -56.9602 Td
(2153 wait\(void\)) 65.5277 Tj
0 -66.4535 Td
(2154 {) 26.2111 Tj
0 -75.9469 Td
(2155   struct proc *p;) 96.1073 Tj
0 -85.4403 Td
(2156   int havekids, pid;) 109.2129 Tj
0 -94.9336 Td
(2157 ) 21.8426 Tj
0 -104.427 Td
(2158   acquire\(&ptable.lock\);) 126.6869 Tj
0 -113.9203 Td
(2159   for\(;;\){) 65.5277 Tj
0 -123.4137 Td
(2160     // Scan through table looking for zombie children.) 257.7424 Tj
0 -132.9071 Td
(2161     havekids = 0;) 96.1073 Tj
0 -142.4004 Td
(2162     for\(p = ptable.proc; p < &ptable.proc[NPROC]; p++\){) 262.1109 Tj
0 -151.8938 Td
(2163       if\(p->parent != cp\)) 131.0554 Tj
0 -161.3871 Td
(2164         continue;) 96.1073 Tj
0 -170.8805 Td
(2165       havekids = 1;) 104.8443 Tj
0 -180.3739 Td
(2166       if\(p->state == ZOMBIE\){) 148.5295 Tj
0 -189.8672 Td
(2167         // Found one.) 113.5814 Tj
0 -199.3606 Td
(2168         pid = p->pid;) 113.5814 Tj
0 -208.8539 Td
(2169         kfree\(p->mem, p->sz\);) 148.5295 Tj
0 -218.3473 Td
(2170         kfree\(p->kstack, KSTACKSIZE\);) 183.4776 Tj
0 -227.8407 Td
(2171         p->state = UNUSED;) 135.4239 Tj
0 -237.334 Td
(2172         p->pid = 0;) 104.8443 Tj
0 -246.8274 Td
(2173         p->parent = 0;) 117.9499 Tj
0 -256.3207 Td
(2174         p->name[0] = 0;) 122.3184 Tj
0 -265.8141 Td
(2175         p->killed = 0;) 117.9499 Tj
0 -275.3075 Td
(2176         release\(&ptable.lock\);) 152.898 Tj
0 -284.8008 Td
(2177         return pid;) 104.8443 Tj
0 -294.2942 Td
(2178       }) 52.4222 Tj
0 -303.7875 Td
(2179     }) 43.6851 Tj
0 -313.2809 Td
(2180 ) 21.8426 Tj
0 -322.7743 Td
(2181     // No point waiting if we don't have any children.) 257.7424 Tj
0 -332.2676 Td
(2182     if\(!havekids || cp->killed\){) 161.635 Tj
0 -341.761 Td
(2183       release\(&ptable.lock\);) 144.161 Tj
0 -351.2543 Td
(2184       return -1;) 91.7388 Tj
0 -360.7477 Td
(2185     }) 43.6851 Tj
0 -370.2411 Td
(2186 ) 21.8426 Tj
0 -379.7344 Td
(2187     // Wait for children to exit.  \(See wakeup1 call in p\
roc_exit.\)) 314.533 Tj
0 -389.2278 Td
(2188     sleep\(cp, &ptable.lock\);  ) 152.898 Tj
0 -398.7211 Td
(2189   }) 34.9481 Tj
0 -408.2145 Td
(2190 }) 26.2111 Tj
0 -417.7079 Td
(2191 ) 21.8426 Tj
0 -427.2012 Td
(2192 ) 21.8426 Tj
0 -436.6946 Td
(2193 ) 21.8426 Tj
0 -446.1879 Td
(2194 ) 21.8426 Tj
0 -455.6813 Td
(2195 ) 21.8426 Tj
0 -465.1747 Td
(2196 ) 21.8426 Tj
0 -474.668 Td
(2197 ) 21.8426 Tj
0 -484.1614 Td
(2198 ) 21.8426 Tj
0 -493.6547 Td
(2199 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 21) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 29 29
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/swtch.S  Page 1) 166.0035 Tj
0 -28.4801 Td
(2200 # Context switch) 91.7388 Tj
0 -37.9735 Td
(2201 #) 26.2111 Tj
0 -47.4668 Td
(2202 #   void swtch\(struct context **old, struct context *new\)\
;) 275.2164 Tj
0 -56.9602 Td
(2203 #) 26.2111 Tj
0 -66.4535 Td
(2204 # Save current register context in old) 187.8461 Tj
0 -75.9469 Td
(2205 # and then load register context from new.) 205.3202 Tj
0 -85.4403 Td
(2206 ) 21.8426 Tj
0 -94.9336 Td
(2207 .globl swtch) 74.2647 Tj
0 -104.427 Td
(2208 swtch:) 48.0537 Tj
0 -113.9203 Td
(2209   movl 4\(%esp\), %eax) 109.2129 Tj
0 -123.4137 Td
(2210   movl 8\(%esp\), %edx) 109.2129 Tj
0 -132.9071 Td
(2211 ) 21.8426 Tj
0 -142.4004 Td
(2212   # Save old callee-save registers) 170.3721 Tj
0 -151.8938 Td
(2213   pushl %ebp) 74.2647 Tj
0 -161.3871 Td
(2214   pushl %ebx) 74.2647 Tj
0 -170.8805 Td
(2215   pushl %esi) 74.2647 Tj
0 -180.3739 Td
(2216   pushl %edi) 74.2647 Tj
0 -189.8672 Td
(2217 ) 21.8426 Tj
0 -199.3606 Td
(2218   # Switch stacks) 96.1073 Tj
0 -208.8539 Td
(2219   movl %esp, \(%eax\)) 104.8443 Tj
0 -218.3473 Td
(2220   movl %edx, %esp) 96.1073 Tj
0 -227.8407 Td
(2221 ) 21.8426 Tj
0 -237.334 Td
(2222   # Load new callee-save registers) 170.3721 Tj
0 -246.8274 Td
(2223   popl %edi) 69.8962 Tj
0 -256.3207 Td
(2224   popl %esi) 69.8962 Tj
0 -265.8141 Td
(2225   popl %ebx) 69.8962 Tj
0 -275.3075 Td
(2226   popl %ebp) 69.8962 Tj
0 -284.8008 Td
(2227   ret) 43.6851 Tj
0 -294.2942 Td
(2228 ) 21.8426 Tj
0 -303.7875 Td
(2229 ) 21.8426 Tj
0 -313.2809 Td
(2230 ) 21.8426 Tj
0 -322.7743 Td
(2231 ) 21.8426 Tj
0 -332.2676 Td
(2232 ) 21.8426 Tj
0 -341.761 Td
(2233 ) 21.8426 Tj
0 -351.2543 Td
(2234 ) 21.8426 Tj
0 -360.7477 Td
(2235 ) 21.8426 Tj
0 -370.2411 Td
(2236 ) 21.8426 Tj
0 -379.7344 Td
(2237 ) 21.8426 Tj
0 -389.2278 Td
(2238 ) 21.8426 Tj
0 -398.7211 Td
(2239 ) 21.8426 Tj
0 -408.2145 Td
(2240 ) 21.8426 Tj
0 -417.7079 Td
(2241 ) 21.8426 Tj
0 -427.2012 Td
(2242 ) 21.8426 Tj
0 -436.6946 Td
(2243 ) 21.8426 Tj
0 -446.1879 Td
(2244 ) 21.8426 Tj
0 -455.6813 Td
(2245 ) 21.8426 Tj
0 -465.1747 Td
(2246 ) 21.8426 Tj
0 -474.668 Td
(2247 ) 21.8426 Tj
0 -484.1614 Td
(2248 ) 21.8426 Tj
0 -493.6547 Td
(2249 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 22) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/kalloc.c  Page 1) 170.3721 Tj
0 -28.4801 Td
(2250 // Physical memory allocator, intended to allocate) 240.2683 Tj
0 -37.9735 Td
(2251 // memory for user processes. Allocates in 4096-byte "page\
s".) 288.322 Tj
0 -47.4668 Td
(2252 // Free list is kept sorted and combines adjacent pages in\
to) 283.9534 Tj
0 -56.9602 Td
(2253 // long runs, to make it easier to allocate big segments.) 270.8479 Tj
0 -66.4535 Td
(2254 // One reason the page size is 4k is that the x86 segment \
size) 292.6905 Tj
0 -75.9469 Td
(2255 // granularity is 4k.) 113.5814 Tj
0 -85.4403 Td
(2256 ) 21.8426 Tj
0 -94.9336 Td
(2257 #include "types.h") 100.4758 Tj
0 -104.427 Td
(2258 #include "defs.h") 96.1073 Tj
0 -113.9203 Td
(2259 #include "param.h") 100.4758 Tj
0 -123.4137 Td
(2260 #include "spinlock.h") 113.5814 Tj
0 -132.9071 Td
(2261 ) 21.8426 Tj
0 -142.4004 Td
(2262 struct run {) 74.2647 Tj
0 -151.8938 Td
(2263   struct run *next;) 104.8443 Tj
0 -161.3871 Td
(2264   int len; // bytes) 104.8443 Tj
0 -170.8805 Td
(2265 };) 30.5796 Tj
0 -180.3739 Td
(2266 ) 21.8426 Tj
0 -189.8672 Td
(2267 struct {) 56.7907 Tj
0 -199.3606 Td
(2268   struct spinlock lock;) 122.3184 Tj
0 -208.8539 Td
(2269   struct run *freelist;) 122.3184 Tj
0 -218.3473 Td
(2270 } kmem;) 52.4222 Tj
0 -227.8407 Td
(2271 ) 21.8426 Tj
0 -237.334 Td
(2272 // Initialize free list of physical pages.) 205.3202 Tj
0 -246.8274 Td
(2273 // This code cheats by just considering one megabyte of) 262.1109 Tj
0 -256.3207 Td
(2274 // pages after end.  Real systems would determine the) 253.3738 Tj
0 -265.8141 Td
(2275 // amount of memory available in the system and use it all\
.) 279.5849 Tj
0 -275.3075 Td
(2276 void) 39.3166 Tj
0 -284.8008 Td
(2277 kinit\(void\)) 69.8962 Tj
0 -294.2942 Td
(2278 {) 26.2111 Tj
0 -303.7875 Td
(2279   extern char end[];) 109.2129 Tj
0 -313.2809 Td
(2280   uint len;) 69.8962 Tj
0 -322.7743 Td
(2281   char *p;) 65.5277 Tj
0 -332.2676 Td
(2282 ) 21.8426 Tj
0 -341.761 Td
(2283   initlock\(&kmem.lock, "kmem"\);) 157.2665 Tj
0 -351.2543 Td
(2284   p = \(char*\)\(\(\(uint\)end + PAGE\) & ~\(PAGE-1\)\);) 222.7942 Tj
0 -360.7477 Td
(2285   len = 256*PAGE; // assume computer has 256 pages of RAM,\
 1 MB) 297.059 Tj
0 -370.2411 Td
(2286   cprintf\("mem = %d\\n", len\);) 148.5295 Tj
0 -379.7344 Td
(2287   kfree\(p, len\);) 91.7388 Tj
0 -389.2278 Td
(2288 }) 26.2111 Tj
0 -398.7211 Td
(2289 ) 21.8426 Tj
0 -408.2145 Td
(2290 ) 21.8426 Tj
0 -417.7079 Td
(2291 ) 21.8426 Tj
0 -427.2012 Td
(2292 ) 21.8426 Tj
0 -436.6946 Td
(2293 ) 21.8426 Tj
0 -446.1879 Td
(2294 ) 21.8426 Tj
0 -455.6813 Td
(2295 ) 21.8426 Tj
0 -465.1747 Td
(2296 ) 21.8426 Tj
0 -474.668 Td
(2297 ) 21.8426 Tj
0 -484.1614 Td
(2298 ) 21.8426 Tj
0 -493.6547 Td
(2299 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 22) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 30 30
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/kalloc.c  Page 2) 170.3721 Tj
0 -28.4801 Td
(2300 // Free the len bytes of memory pointed at by v,) 231.5313 Tj
0 -37.9735 Td
(2301 // which normally should have been returned by a) 231.5313 Tj
0 -47.4668 Td
(2302 // call to kalloc\(len\).  \(The exception is when) 227.1628 Tj
0 -56.9602 Td
(2303 // initializing the allocator; see kinit above.\)) 231.5313 Tj
0 -66.4535 Td
(2304 void) 39.3166 Tj
0 -75.9469 Td
(2305 kfree\(char *v, int len\)) 122.3184 Tj
0 -85.4403 Td
(2306 {) 26.2111 Tj
0 -94.9336 Td
(2307   struct run *r, *rend, **rp, *p, *pend;) 196.5831 Tj
0 -104.427 Td
(2308 ) 21.8426 Tj
0 -113.9203 Td
(2309   if\(len <= 0 || len % PAGE\)) 144.161 Tj
0 -123.4137 Td
(2310     panic\("kfree"\);) 104.8443 Tj
0 -132.9071 Td
(2311 ) 21.8426 Tj
0 -142.4004 Td
(2312   // Fill with junk to catch dangling refs.) 209.6887 Tj
0 -151.8938 Td
(2313   memset\(v, 1, len\);) 109.2129 Tj
0 -161.3871 Td
(2314 ) 21.8426 Tj
0 -170.8805 Td
(2315   acquire\(&kmem.lock\);) 117.9499 Tj
0 -180.3739 Td
(2316   p = \(struct run*\)v;) 113.5814 Tj
0 -189.8672 Td
(2317   pend = \(struct run*\)\(v + len\);) 161.635 Tj
0 -199.3606 Td
(2318   for\(rp=&kmem.freelist; \(r=*rp\) != 0 && r <= pend; rp=\
&r->next\){) 305.796 Tj
0 -208.8539 Td
(2319     rend = \(struct run*\)\(\(char*\)r + r->len\);) 214.0572 Tj
0 -218.3473 Td
(2320     if\(r <= p && p < rend\)) 135.4239 Tj
0 -227.8407 Td
(2321       panic\("freeing free page"\);) 166.0035 Tj
0 -237.334 Td
(2322     if\(rend == p\){  // r before p: expand r to include p) 266.4794 Tj
0 -246.8274 Td
(2323       r->len += len;) 109.2129 Tj
0 -256.3207 Td
(2324       if\(r->next && r->next == pend\){  // r now next to \
r->next?) 301.4275 Tj
0 -265.8141 Td
(2325         r->len += r->next->len;) 157.2665 Tj
0 -275.3075 Td
(2326         r->next = r->next->next;) 161.635 Tj
0 -284.8008 Td
(2327       }) 52.4222 Tj
0 -294.2942 Td
(2328       goto out;) 87.3703 Tj
0 -303.7875 Td
(2329     }) 43.6851 Tj
0 -313.2809 Td
(2330     if\(pend == r\){  // p before r: expand p to include, \
replace r) 305.796 Tj
0 -322.7743 Td
(2331       p->len = len + r->len;) 144.161 Tj
0 -332.2676 Td
(2332       p->next = r->next;) 126.6869 Tj
0 -341.761 Td
(2333       *rp = p;) 83.0018 Tj
0 -351.2543 Td
(2334       goto out;) 87.3703 Tj
0 -360.7477 Td
(2335     }) 43.6851 Tj
0 -370.2411 Td
(2336   }) 34.9481 Tj
0 -379.7344 Td
(2337   // Insert p before r in list.) 157.2665 Tj
0 -389.2278 Td
(2338   p->len = len;) 87.3703 Tj
0 -398.7211 Td
(2339   p->next = r;) 83.0018 Tj
0 -408.2145 Td
(2340   *rp = p;) 65.5277 Tj
0 -417.7079 Td
(2341 ) 21.8426 Tj
0 -427.2012 Td
(2342  out:) 43.6851 Tj
0 -436.6946 Td
(2343   release\(&kmem.lock\);) 117.9499 Tj
0 -446.1879 Td
(2344 }) 26.2111 Tj
0 -455.6813 Td
(2345 ) 21.8426 Tj
0 -465.1747 Td
(2346 ) 21.8426 Tj
0 -474.668 Td
(2347 ) 21.8426 Tj
0 -484.1614 Td
(2348 ) 21.8426 Tj
0 -493.6547 Td
(2349 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 23) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/kalloc.c  Page 3) 170.3721 Tj
0 -28.4801 Td
(2350 // Allocate n bytes of physical memory.) 192.2146 Tj
0 -37.9735 Td
(2351 // Returns a kernel-segment pointer.) 179.1091 Tj
0 -47.4668 Td
(2352 // Returns 0 if the memory cannot be allocated.) 227.1628 Tj
0 -56.9602 Td
(2353 char*) 43.6851 Tj
0 -66.4535 Td
(2354 kalloc\(int n\)) 78.6333 Tj
0 -75.9469 Td
(2355 {) 26.2111 Tj
0 -85.4403 Td
(2356   char *p;) 65.5277 Tj
0 -94.9336 Td
(2357   struct run *r, **rp;) 117.9499 Tj
0 -104.427 Td
(2358 ) 21.8426 Tj
0 -113.9203 Td
(2359   if\(n % PAGE || n <= 0\)) 126.6869 Tj
0 -123.4137 Td
(2360     panic\("kalloc"\);) 109.2129 Tj
0 -132.9071 Td
(2361 ) 21.8426 Tj
0 -142.4004 Td
(2362   acquire\(&kmem.lock\);) 117.9499 Tj
0 -151.8938 Td
(2363   for\(rp=&kmem.freelist; \(r=*rp\) != 0; rp=&r->next\){) 249.0053 Tj
0 -161.3871 Td
(2364     if\(r->len >= n\){) 109.2129 Tj
0 -170.8805 Td
(2365       r->len -= n;) 100.4758 Tj
0 -180.3739 Td
(2366       p = \(char*\)r + r->len;) 144.161 Tj
0 -189.8672 Td
(2367       if\(r->len == 0\)) 113.5814 Tj
0 -199.3606 Td
(2368         *rp = r->next;) 117.9499 Tj
0 -208.8539 Td
(2369       release\(&kmem.lock\);) 135.4239 Tj
0 -218.3473 Td
(2370       return p;) 87.3703 Tj
0 -227.8407 Td
(2371     }) 43.6851 Tj
0 -237.334 Td
(2372   }) 34.9481 Tj
0 -246.8274 Td
(2373   release\(&kmem.lock\);) 117.9499 Tj
0 -256.3207 Td
(2374 ) 21.8426 Tj
0 -265.8141 Td
(2375   cprintf\("kalloc: out of memory\\n"\);) 183.4776 Tj
0 -275.3075 Td
(2376   return 0;) 69.8962 Tj
0 -284.8008 Td
(2377 }) 26.2111 Tj
0 -294.2942 Td
(2378 ) 21.8426 Tj
0 -303.7875 Td
(2379 ) 21.8426 Tj
0 -313.2809 Td
(2380 ) 21.8426 Tj
0 -322.7743 Td
(2381 ) 21.8426 Tj
0 -332.2676 Td
(2382 ) 21.8426 Tj
0 -341.761 Td
(2383 ) 21.8426 Tj
0 -351.2543 Td
(2384 ) 21.8426 Tj
0 -360.7477 Td
(2385 ) 21.8426 Tj
0 -370.2411 Td
(2386 ) 21.8426 Tj
0 -379.7344 Td
(2387 ) 21.8426 Tj
0 -389.2278 Td
(2388 ) 21.8426 Tj
0 -398.7211 Td
(2389 ) 21.8426 Tj
0 -408.2145 Td
(2390 ) 21.8426 Tj
0 -417.7079 Td
(2391 ) 21.8426 Tj
0 -427.2012 Td
(2392 ) 21.8426 Tj
0 -436.6946 Td
(2393 ) 21.8426 Tj
0 -446.1879 Td
(2394 ) 21.8426 Tj
0 -455.6813 Td
(2395 ) 21.8426 Tj
0 -465.1747 Td
(2396 ) 21.8426 Tj
0 -474.668 Td
(2397 ) 21.8426 Tj
0 -484.1614 Td
(2398 ) 21.8426 Tj
0 -493.6547 Td
(2399 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 23) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 31 31
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/traps.h  Page 1) 166.0035 Tj
0 -28.4801 Td
(2400 // x86 trap and interrupt constants.) 179.1091 Tj
0 -37.9735 Td
(2401 ) 21.8426 Tj
0 -47.4668 Td
(2402 // Processor-defined:) 113.5814 Tj
0 -56.9602 Td
(2403 #define T_DIVIDE         0      // divide error) 227.1628 Tj
0 -66.4535 Td
(2404 #define T_DEBUG          1      // debug exception) 240.2683 Tj
0 -75.9469 Td
(2405 #define T_NMI            2      // non-maskable interrupt) 270.8479 Tj
0 -85.4403 Td
(2406 #define T_BRKPT          3      // breakpoint) 218.4257 Tj
0 -94.9336 Td
(2407 #define T_OFLOW          4      // overflow) 209.6887 Tj
0 -104.427 Td
(2408 #define T_BOUND          5      // bounds check) 227.1628 Tj
0 -113.9203 Td
(2409 #define T_ILLOP          6      // illegal opcode) 235.8998 Tj
0 -123.4137 Td
(2410 #define T_DEVICE         7      // device not available) 262.1109 Tj
0 -132.9071 Td
(2411 #define T_DBLFLT         8      // double fault) 227.1628 Tj
0 -142.4004 Td
(2412 // #define T_COPROC      9      // reserved \(not used sin\
ce 486\)) 301.4275 Tj
0 -151.8938 Td
(2413 #define T_TSS           10      // invalid task switch seg\
ment) 292.6905 Tj
0 -161.3871 Td
(2414 #define T_SEGNP         11      // segment not present) 257.7424 Tj
0 -170.8805 Td
(2415 #define T_STACK         12      // stack exception) 240.2683 Tj
0 -180.3739 Td
(2416 #define T_GPFLT         13      // general protection faul\
t) 279.5849 Tj
0 -189.8672 Td
(2417 #define T_PGFLT         14      // page fault) 218.4257 Tj
0 -199.3606 Td
(2418 // #define T_RES        15      // reserved) 209.6887 Tj
0 -208.8539 Td
(2419 #define T_FPERR         16      // floating point error) 262.1109 Tj
0 -218.3473 Td
(2420 #define T_ALIGN         17      // aligment check) 235.8998 Tj
0 -227.8407 Td
(2421 #define T_MCHK          18      // machine check) 231.5313 Tj
0 -237.334 Td
(2422 #define T_SIMDERR       19      // SIMD floating point err\
or) 283.9534 Tj
0 -246.8274 Td
(2423 ) 21.8426 Tj
0 -256.3207 Td
(2424 // These are arbitrarily chosen, but with care not to over\
lap) 288.322 Tj
0 -265.8141 Td
(2425 // processor defined exceptions or interrupt vectors.) 253.3738 Tj
0 -275.3075 Td
(2426 #define T_SYSCALL       64     // system call) 218.4257 Tj
0 -284.8008 Td
(2427 #define T_DEFAULT      500      // catchall) 209.6887 Tj
0 -294.2942 Td
(2428 ) 21.8426 Tj
0 -303.7875 Td
(2429 #define T_IRQ0          32      // IRQ 0 corresponds to in\
t T_IRQ) 305.796 Tj
0 -313.2809 Td
(2430 ) 21.8426 Tj
0 -322.7743 Td
(2431 #define IRQ_TIMER        0) 135.4239 Tj
0 -332.2676 Td
(2432 #define IRQ_KBD          1) 135.4239 Tj
0 -341.761 Td
(2433 #define IRQ_COM1         4) 135.4239 Tj
0 -351.2543 Td
(2434 #define IRQ_IDE         14) 135.4239 Tj
0 -360.7477 Td
(2435 #define IRQ_ERROR       19) 135.4239 Tj
0 -370.2411 Td
(2436 #define IRQ_SPURIOUS    31) 135.4239 Tj
0 -379.7344 Td
(2437 ) 21.8426 Tj
0 -389.2278 Td
(2438 ) 21.8426 Tj
0 -398.7211 Td
(2439 ) 21.8426 Tj
0 -408.2145 Td
(2440 ) 21.8426 Tj
0 -417.7079 Td
(2441 ) 21.8426 Tj
0 -427.2012 Td
(2442 ) 21.8426 Tj
0 -436.6946 Td
(2443 ) 21.8426 Tj
0 -446.1879 Td
(2444 ) 21.8426 Tj
0 -455.6813 Td
(2445 ) 21.8426 Tj
0 -465.1747 Td
(2446 ) 21.8426 Tj
0 -474.668 Td
(2447 ) 21.8426 Tj
0 -484.1614 Td
(2448 ) 21.8426 Tj
0 -493.6547 Td
(2449 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 24) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/vectors.pl  Page 1) 179.1091 Tj
0 -28.4801 Td
(2450 #!/usr/bin/perl -w) 100.4758 Tj
0 -37.9735 Td
(2451 ) 21.8426 Tj
0 -47.4668 Td
(2452 # Generate vectors.S, the trap/interrupt entry points.) 257.7424 Tj
0 -56.9602 Td
(2453 # There has to be one entry point per interrupt number) 257.7424 Tj
0 -66.4535 Td
(2454 # since otherwise there's no way for trap\(\) to discover) 262.1109 Tj
0 -75.9469 Td
(2455 # the interrupt number.) 122.3184 Tj
0 -85.4403 Td
(2456 ) 21.8426 Tj
0 -94.9336 Td
(2457 print "# generated by vectors.pl - do not edit\\n";) 240.2683 Tj
0 -104.427 Td
(2458 print "# handlers\\n";) 113.5814 Tj
0 -113.9203 Td
(2459 print ".globl alltraps\\n";) 135.4239 Tj
0 -123.4137 Td
(2460 for\(my $i = 0; $i < 256; $i++\){) 157.2665 Tj
0 -132.9071 Td
(2461     print ".globl vector$i\\n";) 152.898 Tj
0 -142.4004 Td
(2462     print "vector$i:\\n";) 126.6869 Tj
0 -151.8938 Td
(2463     if\(!\($i == 8 || \($i >= 10 && $i <= 14\) || $i == 17\
\)\){) 270.8479 Tj
0 -161.3871 Td
(2464         print "  pushl \\$0\\n";) 152.898 Tj
0 -170.8805 Td
(2465     }) 43.6851 Tj
0 -180.3739 Td
(2466     print "  pushl \\$$i\\n";) 139.7925 Tj
0 -189.8672 Td
(2467     print "  jmp alltraps\\n";) 148.5295 Tj
0 -199.3606 Td
(2468 }) 26.2111 Tj
0 -208.8539 Td
(2469 ) 21.8426 Tj
0 -218.3473 Td
(2470 print "\\n# vector table\\n";) 139.7925 Tj
0 -227.8407 Td
(2471 print ".data\\n";) 91.7388 Tj
0 -237.334 Td
(2472 print ".globl vectors\\n";) 131.0554 Tj
0 -246.8274 Td
(2473 print "vectors:\\n";) 104.8443 Tj
0 -256.3207 Td
(2474 for\(my $i = 0; $i < 256; $i++\){) 157.2665 Tj
0 -265.8141 Td
(2475     print "  .long vector$i\\n";) 157.2665 Tj
0 -275.3075 Td
(2476 }) 26.2111 Tj
0 -284.8008 Td
(2477 ) 21.8426 Tj
0 -294.2942 Td
(2478 # sample output:) 91.7388 Tj
0 -303.7875 Td
(2479 #   # handlers) 83.0018 Tj
0 -313.2809 Td
(2480 #   .globl alltraps) 104.8443 Tj
0 -322.7743 Td
(2481 #   .globl vector0) 100.4758 Tj
0 -332.2676 Td
(2482 #   vector0:) 74.2647 Tj
0 -341.761 Td
(2483 #     pushl $0) 83.0018 Tj
0 -351.2543 Td
(2484 #     pushl $0) 83.0018 Tj
0 -360.7477 Td
(2485 #     jmp alltraps) 100.4758 Tj
0 -370.2411 Td
(2486 #   ...) 52.4222 Tj
0 -379.7344 Td
(2487 #) 26.2111 Tj
0 -389.2278 Td
(2488 #   # vector table) 100.4758 Tj
0 -398.7211 Td
(2489 #   .data) 61.1592 Tj
0 -408.2145 Td
(2490 #   .globl vectors) 100.4758 Tj
0 -417.7079 Td
(2491 #   vectors:) 74.2647 Tj
0 -427.2012 Td
(2492 #     .long vector0) 104.8443 Tj
0 -436.6946 Td
(2493 #     .long vector1) 104.8443 Tj
0 -446.1879 Td
(2494 #     .long vector2) 104.8443 Tj
0 -455.6813 Td
(2495 #   ...) 52.4222 Tj
0 -465.1747 Td
(2496 ) 21.8426 Tj
0 -474.668 Td
(2497 ) 21.8426 Tj
0 -484.1614 Td
(2498 ) 21.8426 Tj
0 -493.6547 Td
(2499 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 24) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 32 32
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/trapasm.S  Page 1) 174.7406 Tj
0 -28.4801 Td
(2500 #define SEG_KCODE 1  // kernel code) 174.7406 Tj
0 -37.9735 Td
(2501 #define SEG_KDATA 2  // kernel data+stack) 200.9517 Tj
0 -47.4668 Td
(2502 #define SEG_KCPU  3  // kernel per-cpu data) 209.6887 Tj
0 -56.9602 Td
(2503 ) 21.8426 Tj
0 -66.4535 Td
(2504   # vectors.S sends all traps here.) 174.7406 Tj
0 -75.9469 Td
(2505 .globl alltraps) 87.3703 Tj
0 -85.4403 Td
(2506 alltraps:) 61.1592 Tj
0 -94.9336 Td
(2507   # Build trap frame.) 113.5814 Tj
0 -104.427 Td
(2508   pushl %ds) 69.8962 Tj
0 -113.9203 Td
(2509   pushl %es) 69.8962 Tj
0 -123.4137 Td
(2510   pushl %fs) 69.8962 Tj
0 -132.9071 Td
(2511   pushl %gs) 69.8962 Tj
0 -142.4004 Td
(2512   pushal) 56.7907 Tj
0 -151.8938 Td
(2513 ) 21.8426 Tj
0 -161.3871 Td
(2514   # Set up data and per-cpu segments.) 183.4776 Tj
0 -170.8805 Td
(2515   movw $\(SEG_KDATA<<3\), %ax) 139.7925 Tj
0 -180.3739 Td
(2516   movw %ax, %ds) 87.3703 Tj
0 -189.8672 Td
(2517   movw %ax, %es) 87.3703 Tj
0 -199.3606 Td
(2518   movw $\(SEG_KCPU<<3\), %ax) 135.4239 Tj
0 -208.8539 Td
(2519   movw %ax, %fs) 87.3703 Tj
0 -218.3473 Td
(2520   movw %ax, %gs) 87.3703 Tj
0 -227.8407 Td
(2521 ) 21.8426 Tj
0 -237.334 Td
(2522   # Call trap\(tf\), where tf=%esp) 161.635 Tj
0 -246.8274 Td
(2523   pushl %esp) 74.2647 Tj
0 -256.3207 Td
(2524   call trap) 69.8962 Tj
0 -265.8141 Td
(2525   addl $4, %esp) 87.3703 Tj
0 -275.3075 Td
(2526 ) 21.8426 Tj
0 -284.8008 Td
(2527   # Return falls through to trapret...) 187.8461 Tj
0 -294.2942 Td
(2528 .globl trapret) 83.0018 Tj
0 -303.7875 Td
(2529 trapret:) 56.7907 Tj
0 -313.2809 Td
(2530   popal) 52.4222 Tj
0 -322.7743 Td
(2531   popl %gs) 65.5277 Tj
0 -332.2676 Td
(2532   popl %fs) 65.5277 Tj
0 -341.761 Td
(2533   popl %es) 65.5277 Tj
0 -351.2543 Td
(2534   popl %ds) 65.5277 Tj
0 -360.7477 Td
(2535   addl $0x8, %esp  # trapno and errcode) 192.2146 Tj
0 -370.2411 Td
(2536   iret) 48.0537 Tj
0 -379.7344 Td
(2537 ) 21.8426 Tj
0 -389.2278 Td
(2538 ) 21.8426 Tj
0 -398.7211 Td
(2539 ) 21.8426 Tj
0 -408.2145 Td
(2540 ) 21.8426 Tj
0 -417.7079 Td
(2541 ) 21.8426 Tj
0 -427.2012 Td
(2542 ) 21.8426 Tj
0 -436.6946 Td
(2543 ) 21.8426 Tj
0 -446.1879 Td
(2544 ) 21.8426 Tj
0 -455.6813 Td
(2545 ) 21.8426 Tj
0 -465.1747 Td
(2546 ) 21.8426 Tj
0 -474.668 Td
(2547 ) 21.8426 Tj
0 -484.1614 Td
(2548 ) 21.8426 Tj
0 -493.6547 Td
(2549 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 25) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/trap.c  Page 1) 161.635 Tj
0 -28.4801 Td
(2550 #include "types.h") 100.4758 Tj
0 -37.9735 Td
(2551 #include "defs.h") 96.1073 Tj
0 -47.4668 Td
(2552 #include "param.h") 100.4758 Tj
0 -56.9602 Td
(2553 #include "mmu.h") 91.7388 Tj
0 -66.4535 Td
(2554 #include "proc.h") 96.1073 Tj
0 -75.9469 Td
(2555 #include "x86.h") 91.7388 Tj
0 -85.4403 Td
(2556 #include "traps.h") 100.4758 Tj
0 -94.9336 Td
(2557 #include "spinlock.h") 113.5814 Tj
0 -104.427 Td
(2558 ) 21.8426 Tj
0 -113.9203 Td
(2559 // Interrupt descriptor table \(shared by all CPUs\).) 244.6368 Tj
0 -123.4137 Td
(2560 struct gatedesc idt[256];) 131.0554 Tj
0 -132.9071 Td
(2561 extern uint vectors[];  // in vectors.S: array of 256 entr\
y pointers) 318.9016 Tj
0 -142.4004 Td
(2562 struct spinlock tickslock;) 135.4239 Tj
0 -151.8938 Td
(2563 int ticks;) 65.5277 Tj
0 -161.3871 Td
(2564 ) 21.8426 Tj
0 -170.8805 Td
(2565 void) 39.3166 Tj
0 -180.3739 Td
(2566 tvinit\(void\)) 74.2647 Tj
0 -189.8672 Td
(2567 {) 26.2111 Tj
0 -199.3606 Td
(2568   int i;) 56.7907 Tj
0 -208.8539 Td
(2569 ) 21.8426 Tj
0 -218.3473 Td
(2570   for\(i = 0; i < 256; i++\)) 135.4239 Tj
0 -227.8407 Td
(2571     SETGATE\(idt[i], 0, SEG_KCODE<<3, vectors[i], 0\);) 249.0053 Tj
0 -237.334 Td
(2572   SETGATE\(idt[T_SYSCALL], 1, SEG_KCODE<<3, vectors[T_SYSC\
ALL], DPL_USER\);) 340.7441 Tj
0 -246.8274 Td
(2573 ) 21.8426 Tj
0 -256.3207 Td
(2574   initlock\(&tickslock, "time"\);) 157.2665 Tj
0 -265.8141 Td
(2575 }) 26.2111 Tj
0 -275.3075 Td
(2576 ) 21.8426 Tj
0 -284.8008 Td
(2577 void) 39.3166 Tj
0 -294.2942 Td
(2578 idtinit\(void\)) 78.6333 Tj
0 -303.7875 Td
(2579 {) 26.2111 Tj
0 -313.2809 Td
(2580   lidt\(idt, sizeof\(idt\)\);) 131.0554 Tj
0 -322.7743 Td
(2581 }) 26.2111 Tj
0 -332.2676 Td
(2582 ) 21.8426 Tj
0 -341.761 Td
(2583 ) 21.8426 Tj
0 -351.2543 Td
(2584 ) 21.8426 Tj
0 -360.7477 Td
(2585 ) 21.8426 Tj
0 -370.2411 Td
(2586 ) 21.8426 Tj
0 -379.7344 Td
(2587 ) 21.8426 Tj
0 -389.2278 Td
(2588 ) 21.8426 Tj
0 -398.7211 Td
(2589 ) 21.8426 Tj
0 -408.2145 Td
(2590 ) 21.8426 Tj
0 -417.7079 Td
(2591 ) 21.8426 Tj
0 -427.2012 Td
(2592 ) 21.8426 Tj
0 -436.6946 Td
(2593 ) 21.8426 Tj
0 -446.1879 Td
(2594 ) 21.8426 Tj
0 -455.6813 Td
(2595 ) 21.8426 Tj
0 -465.1747 Td
(2596 ) 21.8426 Tj
0 -474.668 Td
(2597 ) 21.8426 Tj
0 -484.1614 Td
(2598 ) 21.8426 Tj
0 -493.6547 Td
(2599 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 25) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 33 33
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/trap.c  Page 2) 161.635 Tj
0 -28.4801 Td
(2600 void) 39.3166 Tj
0 -37.9735 Td
(2601 trap\(struct trapframe *tf\)) 135.4239 Tj
0 -47.4668 Td
(2602 {) 26.2111 Tj
0 -56.9602 Td
(2603   if\(tf->trapno == T_SYSCALL\){) 152.898 Tj
0 -66.4535 Td
(2604     if\(cp->killed\)) 100.4758 Tj
0 -75.9469 Td
(2605       exit\(\);) 78.6333 Tj
0 -85.4403 Td
(2606     cp->tf = tf;) 91.7388 Tj
0 -94.9336 Td
(2607     syscall\(\);) 83.0018 Tj
0 -104.427 Td
(2608     if\(cp->killed\)) 100.4758 Tj
0 -113.9203 Td
(2609       exit\(\);) 78.6333 Tj
0 -123.4137 Td
(2610     return;) 69.8962 Tj
0 -132.9071 Td
(2611   }) 34.9481 Tj
0 -142.4004 Td
(2612 ) 21.8426 Tj
0 -151.8938 Td
(2613   switch\(tf->trapno\){) 113.5814 Tj
0 -161.3871 Td
(2614   case T_IRQ0 + IRQ_TIMER:) 135.4239 Tj
0 -170.8805 Td
(2615     if\(cpu\(\) == 0\){) 104.8443 Tj
0 -180.3739 Td
(2616       acquire\(&tickslock\);) 135.4239 Tj
0 -189.8672 Td
(2617       ticks++;) 83.0018 Tj
0 -199.3606 Td
(2618       wakeup\(&ticks\);) 113.5814 Tj
0 -208.8539 Td
(2619       release\(&tickslock\);) 135.4239 Tj
0 -218.3473 Td
(2620     }) 43.6851 Tj
0 -227.8407 Td
(2621     lapiceoi\(\);) 87.3703 Tj
0 -237.334 Td
(2622     break;) 65.5277 Tj
0 -246.8274 Td
(2623   case T_IRQ0 + IRQ_IDE:) 126.6869 Tj
0 -256.3207 Td
(2624     ideintr\(\);) 83.0018 Tj
0 -265.8141 Td
(2625     lapiceoi\(\);) 87.3703 Tj
0 -275.3075 Td
(2626     break;) 65.5277 Tj
0 -284.8008 Td
(2627   case T_IRQ0 + IRQ_KBD:) 126.6869 Tj
0 -294.2942 Td
(2628     kbdintr\(\);) 83.0018 Tj
0 -303.7875 Td
(2629     lapiceoi\(\);) 87.3703 Tj
0 -313.2809 Td
(2630     break;) 65.5277 Tj
0 -322.7743 Td
(2631   case T_IRQ0 + IRQ_COM1:) 131.0554 Tj
0 -332.2676 Td
(2632     uartintr\(\);) 87.3703 Tj
0 -341.761 Td
(2633     lapiceoi\(\);) 87.3703 Tj
0 -351.2543 Td
(2634     break;) 65.5277 Tj
0 -360.7477 Td
(2635   case T_IRQ0 + 7:) 100.4758 Tj
0 -370.2411 Td
(2636   case T_IRQ0 + IRQ_SPURIOUS:) 148.5295 Tj
0 -379.7344 Td
(2637     cprintf\("cpu%d: spurious interrupt at %x:%x\\n",) 244.6368 Tj
0 -389.2278 Td
(2638             cpu\(\), tf->cs, tf->eip\);) 179.1091 Tj
0 -398.7211 Td
(2639     lapiceoi\(\);) 87.3703 Tj
0 -408.2145 Td
(2640     break;) 65.5277 Tj
0 -417.7079 Td
(2641 ) 21.8426 Tj
0 -427.2012 Td
(2642   default:) 65.5277 Tj
0 -436.6946 Td
(2643     if\(cp == 0 || \(tf->cs&3\) == 0\){) 174.7406 Tj
0 -446.1879 Td
(2644       // In kernel, it must be our mistake.) 209.6887 Tj
0 -455.6813 Td
(2645       cprintf\("unexpected trap %d from cpu %d eip %x\\n",) 266.4794 Tj
0 -465.1747 Td
(2646               tf->trapno, cpu\(\), tf->eip\);) 205.3202 Tj
0 -474.668 Td
(2647       panic\("trap"\);) 109.2129 Tj
0 -484.1614 Td
(2648     }) 43.6851 Tj
0 -493.6547 Td
(2649     // In user space, assume process misbehaved.) 231.5313 Tj
0 -522.1348 Td
(Sheet 26) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/trap.c  Page 3) 161.635 Tj
0 -28.4801 Td
(2650     cprintf\("pid %d %s: trap %d err %d on cpu %d eip %x -\
- kill proc\\n",) 336.3756 Tj
0 -37.9735 Td
(2651             cp->pid, cp->name, tf->trapno, tf->err, cpu\(\)\
, tf->eip\);) 318.9016 Tj
0 -47.4668 Td
(2652     cp->killed = 1;) 104.8443 Tj
0 -56.9602 Td
(2653   }) 34.9481 Tj
0 -66.4535 Td
(2654 ) 21.8426 Tj
0 -75.9469 Td
(2655   // Force process exit if it has been killed and is in us\
er space.) 314.533 Tj
0 -85.4403 Td
(2656   // \(If it is still executing in the kernel, let it keep\
 running) 305.796 Tj
0 -94.9336 Td
(2657   // until it gets to the regular system call return.\)) 257.7424 Tj
0 -104.427 Td
(2658   if\(cp && cp->killed && \(tf->cs&3\) == DPL_USER\)) 231.5313 Tj
0 -113.9203 Td
(2659     exit\(\);) 69.8962 Tj
0 -123.4137 Td
(2660 ) 21.8426 Tj
0 -132.9071 Td
(2661   // Force process to give up CPU on clock tick.) 231.5313 Tj
0 -142.4004 Td
(2662   // If interrupts were on while locks held, would need to\
 check nlock.) 332.0071 Tj
0 -151.8938 Td
(2663   if\(cp && cp->state == RUNNING && tf->trapno == T_IRQ0+I\
RQ_TIMER\)) 310.1645 Tj
0 -161.3871 Td
(2664     yield\(\);) 74.2647 Tj
0 -170.8805 Td
(2665 ) 21.8426 Tj
0 -180.3739 Td
(2666   // Check if the process has been killed since we yielded) 275.2164 Tj
0 -189.8672 Td
(2667   if\(cp && cp->killed && \(tf->cs&3\) == DPL_USER\)) 231.5313 Tj
0 -199.3606 Td
(2668     exit\(\);) 69.8962 Tj
0 -208.8539 Td
(2669 }) 26.2111 Tj
0 -218.3473 Td
(2670 ) 21.8426 Tj
0 -227.8407 Td
(2671 ) 21.8426 Tj
0 -237.334 Td
(2672 ) 21.8426 Tj
0 -246.8274 Td
(2673 ) 21.8426 Tj
0 -256.3207 Td
(2674 ) 21.8426 Tj
0 -265.8141 Td
(2675 ) 21.8426 Tj
0 -275.3075 Td
(2676 ) 21.8426 Tj
0 -284.8008 Td
(2677 ) 21.8426 Tj
0 -294.2942 Td
(2678 ) 21.8426 Tj
0 -303.7875 Td
(2679 ) 21.8426 Tj
0 -313.2809 Td
(2680 ) 21.8426 Tj
0 -322.7743 Td
(2681 ) 21.8426 Tj
0 -332.2676 Td
(2682 ) 21.8426 Tj
0 -341.761 Td
(2683 ) 21.8426 Tj
0 -351.2543 Td
(2684 ) 21.8426 Tj
0 -360.7477 Td
(2685 ) 21.8426 Tj
0 -370.2411 Td
(2686 ) 21.8426 Tj
0 -379.7344 Td
(2687 ) 21.8426 Tj
0 -389.2278 Td
(2688 ) 21.8426 Tj
0 -398.7211 Td
(2689 ) 21.8426 Tj
0 -408.2145 Td
(2690 ) 21.8426 Tj
0 -417.7079 Td
(2691 ) 21.8426 Tj
0 -427.2012 Td
(2692 ) 21.8426 Tj
0 -436.6946 Td
(2693 ) 21.8426 Tj
0 -446.1879 Td
(2694 ) 21.8426 Tj
0 -455.6813 Td
(2695 ) 21.8426 Tj
0 -465.1747 Td
(2696 ) 21.8426 Tj
0 -474.668 Td
(2697 ) 21.8426 Tj
0 -484.1614 Td
(2698 ) 21.8426 Tj
0 -493.6547 Td
(2699 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 26) 34.9481 Tj
Q
Q
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Q
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%%Page: 34 34
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/syscall.h  Page 1) 174.7406 Tj
0 -28.4801 Td
(2700 // System call numbers) 117.9499 Tj
0 -37.9735 Td
(2701 #define SYS_fork    1) 113.5814 Tj
0 -47.4668 Td
(2702 #define SYS_exit    2) 113.5814 Tj
0 -56.9602 Td
(2703 #define SYS_wait    3) 113.5814 Tj
0 -66.4535 Td
(2704 #define SYS_pipe    4) 113.5814 Tj
0 -75.9469 Td
(2705 #define SYS_write   5) 113.5814 Tj
0 -85.4403 Td
(2706 #define SYS_read    6) 113.5814 Tj
0 -94.9336 Td
(2707 #define SYS_close   7) 113.5814 Tj
0 -104.427 Td
(2708 #define SYS_kill    8) 113.5814 Tj
0 -113.9203 Td
(2709 #define SYS_exec    9) 113.5814 Tj
0 -123.4137 Td
(2710 #define SYS_open   10) 113.5814 Tj
0 -132.9071 Td
(2711 #define SYS_mknod  11) 113.5814 Tj
0 -142.4004 Td
(2712 #define SYS_unlink 12) 113.5814 Tj
0 -151.8938 Td
(2713 #define SYS_fstat  13) 113.5814 Tj
0 -161.3871 Td
(2714 #define SYS_link   14) 113.5814 Tj
0 -170.8805 Td
(2715 #define SYS_mkdir  15) 113.5814 Tj
0 -180.3739 Td
(2716 #define SYS_chdir  16) 113.5814 Tj
0 -189.8672 Td
(2717 #define SYS_dup    17) 113.5814 Tj
0 -199.3606 Td
(2718 #define SYS_getpid 18) 113.5814 Tj
0 -208.8539 Td
(2719 #define SYS_sbrk   19) 113.5814 Tj
0 -218.3473 Td
(2720 #define SYS_sleep  20) 113.5814 Tj
0 -227.8407 Td
(2721 ) 21.8426 Tj
0 -237.334 Td
(2722 ) 21.8426 Tj
0 -246.8274 Td
(2723 ) 21.8426 Tj
0 -256.3207 Td
(2724 ) 21.8426 Tj
0 -265.8141 Td
(2725 ) 21.8426 Tj
0 -275.3075 Td
(2726 ) 21.8426 Tj
0 -284.8008 Td
(2727 ) 21.8426 Tj
0 -294.2942 Td
(2728 ) 21.8426 Tj
0 -303.7875 Td
(2729 ) 21.8426 Tj
0 -313.2809 Td
(2730 ) 21.8426 Tj
0 -322.7743 Td
(2731 ) 21.8426 Tj
0 -332.2676 Td
(2732 ) 21.8426 Tj
0 -341.761 Td
(2733 ) 21.8426 Tj
0 -351.2543 Td
(2734 ) 21.8426 Tj
0 -360.7477 Td
(2735 ) 21.8426 Tj
0 -370.2411 Td
(2736 ) 21.8426 Tj
0 -379.7344 Td
(2737 ) 21.8426 Tj
0 -389.2278 Td
(2738 ) 21.8426 Tj
0 -398.7211 Td
(2739 ) 21.8426 Tj
0 -408.2145 Td
(2740 ) 21.8426 Tj
0 -417.7079 Td
(2741 ) 21.8426 Tj
0 -427.2012 Td
(2742 ) 21.8426 Tj
0 -436.6946 Td
(2743 ) 21.8426 Tj
0 -446.1879 Td
(2744 ) 21.8426 Tj
0 -455.6813 Td
(2745 ) 21.8426 Tj
0 -465.1747 Td
(2746 ) 21.8426 Tj
0 -474.668 Td
(2747 ) 21.8426 Tj
0 -484.1614 Td
(2748 ) 21.8426 Tj
0 -493.6547 Td
(2749 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 27) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/syscall.c  Page 1) 174.7406 Tj
0 -28.4801 Td
(2750 #include "types.h") 100.4758 Tj
0 -37.9735 Td
(2751 #include "defs.h") 96.1073 Tj
0 -47.4668 Td
(2752 #include "param.h") 100.4758 Tj
0 -56.9602 Td
(2753 #include "mmu.h") 91.7388 Tj
0 -66.4535 Td
(2754 #include "proc.h") 96.1073 Tj
0 -75.9469 Td
(2755 #include "x86.h") 91.7388 Tj
0 -85.4403 Td
(2756 #include "syscall.h") 109.2129 Tj
0 -94.9336 Td
(2757 ) 21.8426 Tj
0 -104.427 Td
(2758 // User code makes a system call with INT T_SYSCALL.) 249.0053 Tj
0 -113.9203 Td
(2759 // System call number in %eax.) 152.898 Tj
0 -123.4137 Td
(2760 // Arguments on the stack, from the user call to the C) 257.7424 Tj
0 -132.9071 Td
(2761 // library system call function. The saved user %esp point\
s) 279.5849 Tj
0 -142.4004 Td
(2762 // to a saved program counter, and then the first argument\
.) 279.5849 Tj
0 -151.8938 Td
(2763 ) 21.8426 Tj
0 -161.3871 Td
(2764 // Fetch the int at addr from process p.) 196.5831 Tj
0 -170.8805 Td
(2765 int) 34.9481 Tj
0 -180.3739 Td
(2766 fetchint\(struct proc *p, uint addr, int *ip\)) 214.0572 Tj
0 -189.8672 Td
(2767 {) 26.2111 Tj
0 -199.3606 Td
(2768   if\(addr >= p->sz || addr+4 > p->sz\)) 183.4776 Tj
0 -208.8539 Td
(2769     return -1;) 83.0018 Tj
0 -218.3473 Td
(2770   *ip = *\(int*\)\(p->mem + addr\);) 157.2665 Tj
0 -227.8407 Td
(2771   return 0;) 69.8962 Tj
0 -237.334 Td
(2772 }) 26.2111 Tj
0 -246.8274 Td
(2773 ) 21.8426 Tj
0 -256.3207 Td
(2774 // Fetch the nul-terminated string at addr from process p.) 275.2164 Tj
0 -265.8141 Td
(2775 // Doesn't actually copy the string - just sets *pp to poi\
nt at it.) 314.533 Tj
0 -275.3075 Td
(2776 // Returns length of string, not including nul.) 227.1628 Tj
0 -284.8008 Td
(2777 int) 34.9481 Tj
0 -294.2942 Td
(2778 fetchstr\(struct proc *p, uint addr, char **pp\)) 222.7942 Tj
0 -303.7875 Td
(2779 {) 26.2111 Tj
0 -313.2809 Td
(2780   char *s, *ep;) 87.3703 Tj
0 -322.7743 Td
(2781 ) 21.8426 Tj
0 -332.2676 Td
(2782   if\(addr >= p->sz\)) 104.8443 Tj
0 -341.761 Td
(2783     return -1;) 83.0018 Tj
0 -351.2543 Td
(2784   *pp = p->mem + addr;) 117.9499 Tj
0 -360.7477 Td
(2785   ep = p->mem + p->sz;) 117.9499 Tj
0 -370.2411 Td
(2786   for\(s = *pp; s < ep; s++\)) 139.7925 Tj
0 -379.7344 Td
(2787     if\(*s == 0\)) 87.3703 Tj
0 -389.2278 Td
(2788       return s - *pp;) 113.5814 Tj
0 -398.7211 Td
(2789   return -1;) 74.2647 Tj
0 -408.2145 Td
(2790 }) 26.2111 Tj
0 -417.7079 Td
(2791 ) 21.8426 Tj
0 -427.2012 Td
(2792 // Fetch the nth 32-bit system call argument.) 218.4257 Tj
0 -436.6946 Td
(2793 int) 34.9481 Tj
0 -446.1879 Td
(2794 argint\(int n, int *ip\)) 117.9499 Tj
0 -455.6813 Td
(2795 {) 26.2111 Tj
0 -465.1747 Td
(2796   return fetchint\(cp, cp->tf->esp + 4 + 4*n, ip\);) 235.8998 Tj
0 -474.668 Td
(2797 }) 26.2111 Tj
0 -484.1614 Td
(2798 ) 21.8426 Tj
0 -493.6547 Td
(2799 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 27) 34.9481 Tj
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Q
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%%Page: 35 35
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/syscall.c  Page 2) 174.7406 Tj
0 -28.4801 Td
(2800 // Fetch the nth word-sized system call argument as a poin\
ter) 288.322 Tj
0 -37.9735 Td
(2801 // to a block of memory of size n bytes.  Check that the p\
ointer) 301.4275 Tj
0 -47.4668 Td
(2802 // lies within the process address space.) 200.9517 Tj
0 -56.9602 Td
(2803 int) 34.9481 Tj
0 -66.4535 Td
(2804 argptr\(int n, char **pp, int size\)) 170.3721 Tj
0 -75.9469 Td
(2805 {) 26.2111 Tj
0 -85.4403 Td
(2806   int i;) 56.7907 Tj
0 -94.9336 Td
(2807 ) 21.8426 Tj
0 -104.427 Td
(2808   if\(argint\(n, &i\) < 0\)) 122.3184 Tj
0 -113.9203 Td
(2809     return -1;) 83.0018 Tj
0 -123.4137 Td
(2810   if\(\(uint\)i >= cp->sz || \(uint\)i+size >= cp->sz\)) 235.8998 Tj
0 -132.9071 Td
(2811     return -1;) 83.0018 Tj
0 -142.4004 Td
(2812   *pp = cp->mem + i;) 109.2129 Tj
0 -151.8938 Td
(2813   return 0;) 69.8962 Tj
0 -161.3871 Td
(2814 }) 26.2111 Tj
0 -170.8805 Td
(2815 ) 21.8426 Tj
0 -180.3739 Td
(2816 // Fetch the nth word-sized system call argument as a stri\
ng pointer.) 323.2701 Tj
0 -189.8672 Td
(2817 // Check that the pointer is valid and the string is nul-t\
erminated.) 318.9016 Tj
0 -199.3606 Td
(2818 // \(There is no shared writable memory, so the string can\
't change) 310.1645 Tj
0 -208.8539 Td
(2819 // between this check and being used by the kernel.\)) 249.0053 Tj
0 -218.3473 Td
(2820 int) 34.9481 Tj
0 -227.8407 Td
(2821 argstr\(int n, char **pp\)) 126.6869 Tj
0 -237.334 Td
(2822 {) 26.2111 Tj
0 -246.8274 Td
(2823   int addr;) 69.8962 Tj
0 -256.3207 Td
(2824   if\(argint\(n, &addr\) < 0\)) 135.4239 Tj
0 -265.8141 Td
(2825     return -1;) 83.0018 Tj
0 -275.3075 Td
(2826   return fetchstr\(cp, addr, pp\);) 161.635 Tj
0 -284.8008 Td
(2827 }) 26.2111 Tj
0 -294.2942 Td
(2828 ) 21.8426 Tj
0 -303.7875 Td
(2829 extern int sys_chdir\(void\);) 139.7925 Tj
0 -313.2809 Td
(2830 extern int sys_close\(void\);) 139.7925 Tj
0 -322.7743 Td
(2831 extern int sys_dup\(void\);) 131.0554 Tj
0 -332.2676 Td
(2832 extern int sys_exec\(void\);) 135.4239 Tj
0 -341.761 Td
(2833 extern int sys_exit\(void\);) 135.4239 Tj
0 -351.2543 Td
(2834 extern int sys_fork\(void\);) 135.4239 Tj
0 -360.7477 Td
(2835 extern int sys_fstat\(void\);) 139.7925 Tj
0 -370.2411 Td
(2836 extern int sys_getpid\(void\);) 144.161 Tj
0 -379.7344 Td
(2837 extern int sys_kill\(void\);) 135.4239 Tj
0 -389.2278 Td
(2838 extern int sys_link\(void\);) 135.4239 Tj
0 -398.7211 Td
(2839 extern int sys_mkdir\(void\);) 139.7925 Tj
0 -408.2145 Td
(2840 extern int sys_mknod\(void\);) 139.7925 Tj
0 -417.7079 Td
(2841 extern int sys_open\(void\);) 135.4239 Tj
0 -427.2012 Td
(2842 extern int sys_pipe\(void\);) 135.4239 Tj
0 -436.6946 Td
(2843 extern int sys_read\(void\);) 135.4239 Tj
0 -446.1879 Td
(2844 extern int sys_sbrk\(void\);) 135.4239 Tj
0 -455.6813 Td
(2845 extern int sys_sleep\(void\);) 139.7925 Tj
0 -465.1747 Td
(2846 extern int sys_unlink\(void\);) 144.161 Tj
0 -474.668 Td
(2847 extern int sys_wait\(void\);) 135.4239 Tj
0 -484.1614 Td
(2848 extern int sys_write\(void\);) 139.7925 Tj
0 -493.6547 Td
(2849 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 28) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/syscall.c  Page 3) 174.7406 Tj
0 -28.4801 Td
(2850 static int \(*syscalls[]\)\(void\) = {) 170.3721 Tj
0 -37.9735 Td
(2851 [SYS_chdir]   sys_chdir,) 126.6869 Tj
0 -47.4668 Td
(2852 [SYS_close]   sys_close,) 126.6869 Tj
0 -56.9602 Td
(2853 [SYS_dup]     sys_dup,) 117.9499 Tj
0 -66.4535 Td
(2854 [SYS_exec]    sys_exec,) 122.3184 Tj
0 -75.9469 Td
(2855 [SYS_exit]    sys_exit,) 122.3184 Tj
0 -85.4403 Td
(2856 [SYS_fork]    sys_fork,) 122.3184 Tj
0 -94.9336 Td
(2857 [SYS_fstat]   sys_fstat,) 126.6869 Tj
0 -104.427 Td
(2858 [SYS_getpid]  sys_getpid,) 131.0554 Tj
0 -113.9203 Td
(2859 [SYS_kill]    sys_kill,) 122.3184 Tj
0 -123.4137 Td
(2860 [SYS_link]    sys_link,) 122.3184 Tj
0 -132.9071 Td
(2861 [SYS_mkdir]   sys_mkdir,) 126.6869 Tj
0 -142.4004 Td
(2862 [SYS_mknod]   sys_mknod,) 126.6869 Tj
0 -151.8938 Td
(2863 [SYS_open]    sys_open,) 122.3184 Tj
0 -161.3871 Td
(2864 [SYS_pipe]    sys_pipe,) 122.3184 Tj
0 -170.8805 Td
(2865 [SYS_read]    sys_read,) 122.3184 Tj
0 -180.3739 Td
(2866 [SYS_sbrk]    sys_sbrk,) 122.3184 Tj
0 -189.8672 Td
(2867 [SYS_sleep]   sys_sleep,) 126.6869 Tj
0 -199.3606 Td
(2868 [SYS_unlink]  sys_unlink,) 131.0554 Tj
0 -208.8539 Td
(2869 [SYS_wait]    sys_wait,) 122.3184 Tj
0 -218.3473 Td
(2870 [SYS_write]   sys_write,) 126.6869 Tj
0 -227.8407 Td
(2871 };) 30.5796 Tj
0 -237.334 Td
(2872 ) 21.8426 Tj
0 -246.8274 Td
(2873 void) 39.3166 Tj
0 -256.3207 Td
(2874 syscall\(void\)) 78.6333 Tj
0 -265.8141 Td
(2875 {) 26.2111 Tj
0 -275.3075 Td
(2876   int num;) 65.5277 Tj
0 -284.8008 Td
(2877 ) 21.8426 Tj
0 -294.2942 Td
(2878   num = cp->tf->eax;) 109.2129 Tj
0 -303.7875 Td
(2879   if\(num >= 0 && num < NELEM\(syscalls\) && syscalls[num]\
\)) 266.4794 Tj
0 -313.2809 Td
(2880     cp->tf->eax = syscalls[num]\(\);) 170.3721 Tj
0 -322.7743 Td
(2881   else {) 56.7907 Tj
0 -332.2676 Td
(2882     cprintf\("%d %s: unknown sys call %d\\n",) 209.6887 Tj
0 -341.761 Td
(2883             cp->pid, cp->name, num\);) 179.1091 Tj
0 -351.2543 Td
(2884     cp->tf->eax = -1;) 113.5814 Tj
0 -360.7477 Td
(2885   }) 34.9481 Tj
0 -370.2411 Td
(2886 }) 26.2111 Tj
0 -379.7344 Td
(2887 ) 21.8426 Tj
0 -389.2278 Td
(2888 ) 21.8426 Tj
0 -398.7211 Td
(2889 ) 21.8426 Tj
0 -408.2145 Td
(2890 ) 21.8426 Tj
0 -417.7079 Td
(2891 ) 21.8426 Tj
0 -427.2012 Td
(2892 ) 21.8426 Tj
0 -436.6946 Td
(2893 ) 21.8426 Tj
0 -446.1879 Td
(2894 ) 21.8426 Tj
0 -455.6813 Td
(2895 ) 21.8426 Tj
0 -465.1747 Td
(2896 ) 21.8426 Tj
0 -474.668 Td
(2897 ) 21.8426 Tj
0 -484.1614 Td
(2898 ) 21.8426 Tj
0 -493.6547 Td
(2899 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 28) 34.9481 Tj
Q
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(Aug  8 01:04 2009  xv6/sysproc.c  Page 1) 174.7406 Tj
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(2900 #include "types.h") 100.4758 Tj
0 -37.9735 Td
(2901 #include "x86.h") 91.7388 Tj
0 -47.4668 Td
(2902 #include "defs.h") 96.1073 Tj
0 -56.9602 Td
(2903 #include "param.h") 100.4758 Tj
0 -66.4535 Td
(2904 #include "mmu.h") 91.7388 Tj
0 -75.9469 Td
(2905 #include "proc.h") 96.1073 Tj
0 -85.4403 Td
(2906 ) 21.8426 Tj
0 -94.9336 Td
(2907 int) 34.9481 Tj
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(2909 {) 26.2111 Tj
0 -123.4137 Td
(2910   return fork\(\);) 91.7388 Tj
0 -132.9071 Td
(2911 }) 26.2111 Tj
0 -142.4004 Td
(2912 ) 21.8426 Tj
0 -151.8938 Td
(2913 int) 34.9481 Tj
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(2914 sys_exit\(void\)) 83.0018 Tj
0 -170.8805 Td
(2915 {) 26.2111 Tj
0 -180.3739 Td
(2916   exit\(\);) 61.1592 Tj
0 -189.8672 Td
(2917   return 0;  // not reached) 139.7925 Tj
0 -199.3606 Td
(2918 }) 26.2111 Tj
0 -208.8539 Td
(2919 ) 21.8426 Tj
0 -218.3473 Td
(2920 int) 34.9481 Tj
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(2921 sys_wait\(void\)) 83.0018 Tj
0 -237.334 Td
(2922 {) 26.2111 Tj
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(2923   return wait\(\);) 91.7388 Tj
0 -256.3207 Td
(2924 }) 26.2111 Tj
0 -265.8141 Td
(2925 ) 21.8426 Tj
0 -275.3075 Td
(2926 int) 34.9481 Tj
0 -284.8008 Td
(2927 sys_kill\(void\)) 83.0018 Tj
0 -294.2942 Td
(2928 {) 26.2111 Tj
0 -303.7875 Td
(2929   int pid;) 65.5277 Tj
0 -313.2809 Td
(2930 ) 21.8426 Tj
0 -322.7743 Td
(2931   if\(argint\(0, &pid\) < 0\)) 131.0554 Tj
0 -332.2676 Td
(2932     return -1;) 83.0018 Tj
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(2933   return kill\(pid\);) 104.8443 Tj
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(2934 }) 26.2111 Tj
0 -360.7477 Td
(2935 ) 21.8426 Tj
0 -370.2411 Td
(2936 int) 34.9481 Tj
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(2937 sys_getpid\(void\)) 91.7388 Tj
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(2938 {) 26.2111 Tj
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(2939   return cp->pid;) 96.1073 Tj
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(2940 }) 26.2111 Tj
0 -417.7079 Td
(2941 ) 21.8426 Tj
0 -427.2012 Td
(2942 ) 21.8426 Tj
0 -436.6946 Td
(2943 ) 21.8426 Tj
0 -446.1879 Td
(2944 ) 21.8426 Tj
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(2945 ) 21.8426 Tj
0 -465.1747 Td
(2946 ) 21.8426 Tj
0 -474.668 Td
(2947 ) 21.8426 Tj
0 -484.1614 Td
(2948 ) 21.8426 Tj
0 -493.6547 Td
(2949 ) 21.8426 Tj
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(Sheet 29) 34.9481 Tj
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(Aug  8 01:04 2009  xv6/sysproc.c  Page 2) 174.7406 Tj
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(2950 int) 34.9481 Tj
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(2951 sys_sbrk\(void\)) 83.0018 Tj
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(2952 {) 26.2111 Tj
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(2953   int addr;) 69.8962 Tj
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(2954   int n;) 56.7907 Tj
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(2955 ) 21.8426 Tj
0 -85.4403 Td
(2956   if\(argint\(0, &n\) < 0\)) 122.3184 Tj
0 -94.9336 Td
(2957     return -1;) 83.0018 Tj
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(2958   addr = cp->sz;) 91.7388 Tj
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(2959   if\(growproc\(n\) < 0\)) 113.5814 Tj
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(2960     return -1;) 83.0018 Tj
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(2961   return addr;) 83.0018 Tj
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(2963 ) 21.8426 Tj
0 -161.3871 Td
(2964 int) 34.9481 Tj
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(2965 sys_sleep\(void\)) 87.3703 Tj
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(2966 {) 26.2111 Tj
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(2970     return -1;) 83.0018 Tj
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(2973   while\(ticks - ticks0 < n\){) 144.161 Tj
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(2974     if\(cp->killed\){) 104.8443 Tj
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(2975       release\(&tickslock\);) 135.4239 Tj
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(2976       return -1;) 91.7388 Tj
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(2978     sleep\(&ticks, &tickslock\);) 152.898 Tj
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(2979   }) 34.9481 Tj
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(2980   release\(&tickslock\);) 117.9499 Tj
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(2981   return 0;) 69.8962 Tj
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(2982 }) 26.2111 Tj
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(2983 ) 21.8426 Tj
0 -351.2543 Td
(2984 ) 21.8426 Tj
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(2985 ) 21.8426 Tj
0 -370.2411 Td
(2986 ) 21.8426 Tj
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(2987 ) 21.8426 Tj
0 -389.2278 Td
(2988 ) 21.8426 Tj
0 -398.7211 Td
(2989 ) 21.8426 Tj
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(2990 ) 21.8426 Tj
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(2991 ) 21.8426 Tj
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(2992 ) 21.8426 Tj
0 -436.6946 Td
(2993 ) 21.8426 Tj
0 -446.1879 Td
(2994 ) 21.8426 Tj
0 -455.6813 Td
(2995 ) 21.8426 Tj
0 -465.1747 Td
(2996 ) 21.8426 Tj
0 -474.668 Td
(2997 ) 21.8426 Tj
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(2998 ) 21.8426 Tj
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(2999 ) 21.8426 Tj
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(Sheet 29) 34.9481 Tj
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(Aug  8 01:04 2009  xv6/buf.h  Page 1) 157.2665 Tj
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(3001   int flags;) 74.2647 Tj
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(3002   uint dev;) 69.8962 Tj
0 -56.9602 Td
(3003   uint sector;) 83.0018 Tj
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(3004   struct buf *prev; // LRU cache list) 183.4776 Tj
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(3009 #define B_BUSY  0x1  // buffer is locked by some process) 266.4794 Tj
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(3010 #define B_VALID 0x2  // buffer has been read from disk) 257.7424 Tj
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(3013 ) 21.8426 Tj
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(3016 ) 21.8426 Tj
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(3018 ) 21.8426 Tj
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(3020 ) 21.8426 Tj
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(3021 ) 21.8426 Tj
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(3022 ) 21.8426 Tj
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(3023 ) 21.8426 Tj
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(3025 ) 21.8426 Tj
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(3027 ) 21.8426 Tj
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(3028 ) 21.8426 Tj
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(3029 ) 21.8426 Tj
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(3030 ) 21.8426 Tj
0 -322.7743 Td
(3031 ) 21.8426 Tj
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(3032 ) 21.8426 Tj
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(3033 ) 21.8426 Tj
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(3034 ) 21.8426 Tj
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(3035 ) 21.8426 Tj
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(3036 ) 21.8426 Tj
0 -379.7344 Td
(3037 ) 21.8426 Tj
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(3038 ) 21.8426 Tj
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(3039 ) 21.8426 Tj
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(3040 ) 21.8426 Tj
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(3041 ) 21.8426 Tj
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(3042 ) 21.8426 Tj
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(3043 ) 21.8426 Tj
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(3044 ) 21.8426 Tj
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(3045 ) 21.8426 Tj
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(3046 ) 21.8426 Tj
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(3047 ) 21.8426 Tj
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(3048 ) 21.8426 Tj
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(Aug  8 01:04 2009  xv6/fcntl.h  Page 1) 166.0035 Tj
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(3053 #define O_CREATE  0x200) 122.3184 Tj
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(3054 ) 21.8426 Tj
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(3055 ) 21.8426 Tj
0 -85.4403 Td
(3056 ) 21.8426 Tj
0 -94.9336 Td
(3057 ) 21.8426 Tj
0 -104.427 Td
(3058 ) 21.8426 Tj
0 -113.9203 Td
(3059 ) 21.8426 Tj
0 -123.4137 Td
(3060 ) 21.8426 Tj
0 -132.9071 Td
(3061 ) 21.8426 Tj
0 -142.4004 Td
(3062 ) 21.8426 Tj
0 -151.8938 Td
(3063 ) 21.8426 Tj
0 -161.3871 Td
(3064 ) 21.8426 Tj
0 -170.8805 Td
(3065 ) 21.8426 Tj
0 -180.3739 Td
(3066 ) 21.8426 Tj
0 -189.8672 Td
(3067 ) 21.8426 Tj
0 -199.3606 Td
(3068 ) 21.8426 Tj
0 -208.8539 Td
(3069 ) 21.8426 Tj
0 -218.3473 Td
(3070 ) 21.8426 Tj
0 -227.8407 Td
(3071 ) 21.8426 Tj
0 -237.334 Td
(3072 ) 21.8426 Tj
0 -246.8274 Td
(3073 ) 21.8426 Tj
0 -256.3207 Td
(3074 ) 21.8426 Tj
0 -265.8141 Td
(3075 ) 21.8426 Tj
0 -275.3075 Td
(3076 ) 21.8426 Tj
0 -284.8008 Td
(3077 ) 21.8426 Tj
0 -294.2942 Td
(3078 ) 21.8426 Tj
0 -303.7875 Td
(3079 ) 21.8426 Tj
0 -313.2809 Td
(3080 ) 21.8426 Tj
0 -322.7743 Td
(3081 ) 21.8426 Tj
0 -332.2676 Td
(3082 ) 21.8426 Tj
0 -341.761 Td
(3083 ) 21.8426 Tj
0 -351.2543 Td
(3084 ) 21.8426 Tj
0 -360.7477 Td
(3085 ) 21.8426 Tj
0 -370.2411 Td
(3086 ) 21.8426 Tj
0 -379.7344 Td
(3087 ) 21.8426 Tj
0 -389.2278 Td
(3088 ) 21.8426 Tj
0 -398.7211 Td
(3089 ) 21.8426 Tj
0 -408.2145 Td
(3090 ) 21.8426 Tj
0 -417.7079 Td
(3091 ) 21.8426 Tj
0 -427.2012 Td
(3092 ) 21.8426 Tj
0 -436.6946 Td
(3093 ) 21.8426 Tj
0 -446.1879 Td
(3094 ) 21.8426 Tj
0 -455.6813 Td
(3095 ) 21.8426 Tj
0 -465.1747 Td
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(3184 // Block containing inode i) 139.7925 Tj
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(3253   char readable;) 91.7388 Tj
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(3321 // idequeue->qnext points to the next buf to be processed.) 275.2164 Tj
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(3330 // Wait for IDE disk to become ready.) 183.4776 Tj
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(3339     return -1;) 83.0018 Tj
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(3354 ) 21.8426 Tj
0 -75.9469 Td
(3355   initlock\(&idelock, "ide"\);) 144.161 Tj
0 -85.4403 Td
(3356   picenable\(IRQ_IDE\);) 113.5814 Tj
0 -94.9336 Td
(3357   ioapicenable\(IRQ_IDE, ncpu - 1\);) 170.3721 Tj
0 -104.427 Td
(3358   idewait\(0\);) 78.6333 Tj
0 -113.9203 Td
(3359 ) 21.8426 Tj
0 -123.4137 Td
(3360   // Check if disk 1 is present) 157.2665 Tj
0 -132.9071 Td
(3361   outb\(0x1f6, 0xe0 | \(1<<4\)\);) 148.5295 Tj
0 -142.4004 Td
(3362   for\(i=0; i<1000; i++\){) 126.6869 Tj
0 -151.8938 Td
(3363     if\(inb\(0x1f7\) != 0\){) 126.6869 Tj
0 -161.3871 Td
(3364       havedisk1 = 1;) 109.2129 Tj
0 -170.8805 Td
(3365       break;) 74.2647 Tj
0 -180.3739 Td
(3366     }) 43.6851 Tj
0 -189.8672 Td
(3367   }) 34.9481 Tj
0 -199.3606 Td
(3368 ) 21.8426 Tj
0 -208.8539 Td
(3369   // Switch back to disk 0.) 139.7925 Tj
0 -218.3473 Td
(3370   outb\(0x1f6, 0xe0 | \(0<<4\)\);) 148.5295 Tj
0 -227.8407 Td
(3371 }) 26.2111 Tj
0 -237.334 Td
(3372 ) 21.8426 Tj
0 -246.8274 Td
(3373 // Start the request for b.  Caller must hold idelock.) 257.7424 Tj
0 -256.3207 Td
(3374 static void) 69.8962 Tj
0 -265.8141 Td
(3375 idestart\(struct buf *b\)) 122.3184 Tj
0 -275.3075 Td
(3376 {) 26.2111 Tj
0 -284.8008 Td
(3377   if\(b == 0\)) 74.2647 Tj
0 -294.2942 Td
(3378     panic\("idestart"\);) 117.9499 Tj
0 -303.7875 Td
(3379 ) 21.8426 Tj
0 -313.2809 Td
(3380   idewait\(0\);) 78.6333 Tj
0 -322.7743 Td
(3381   outb\(0x3f6, 0\);  // generate interrupt) 196.5831 Tj
0 -332.2676 Td
(3382   outb\(0x1f2, 1\);  // number of sectors) 192.2146 Tj
0 -341.761 Td
(3383   outb\(0x1f3, b->sector & 0xff\);) 161.635 Tj
0 -351.2543 Td
(3384   outb\(0x1f4, \(b->sector >> 8\) & 0xff\);) 192.2146 Tj
0 -360.7477 Td
(3385   outb\(0x1f5, \(b->sector >> 16\) & 0xff\);) 196.5831 Tj
0 -370.2411 Td
(3386   outb\(0x1f6, 0xe0 | \(\(b->dev&1\)<<4\) | \(\(b->sector>\
>24\)&0x0f\)\);) 297.059 Tj
0 -379.7344 Td
(3387   if\(b->flags & B_DIRTY\){) 131.0554 Tj
0 -389.2278 Td
(3388     outb\(0x1f7, IDE_CMD_WRITE\);) 157.2665 Tj
0 -398.7211 Td
(3389     outsl\(0x1f0, b->data, 512/4\);) 166.0035 Tj
0 -408.2145 Td
(3390   } else {) 65.5277 Tj
0 -417.7079 Td
(3391     outb\(0x1f7, IDE_CMD_READ\);) 152.898 Tj
0 -427.2012 Td
(3392   }) 34.9481 Tj
0 -436.6946 Td
(3393 }) 26.2111 Tj
0 -446.1879 Td
(3394 ) 21.8426 Tj
0 -455.6813 Td
(3395 ) 21.8426 Tj
0 -465.1747 Td
(3396 ) 21.8426 Tj
0 -474.668 Td
(3397 ) 21.8426 Tj
0 -484.1614 Td
(3398 ) 21.8426 Tj
0 -493.6547 Td
(3399 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 33) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 41 41
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%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
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[] 0 d
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false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/ide.c  Page 3) 157.2665 Tj
0 -28.4801 Td
(3400 // Interrupt handler.) 113.5814 Tj
0 -37.9735 Td
(3401 void) 39.3166 Tj
0 -47.4668 Td
(3402 ideintr\(void\)) 78.6333 Tj
0 -56.9602 Td
(3403 {) 26.2111 Tj
0 -66.4535 Td
(3404   struct buf *b;) 91.7388 Tj
0 -75.9469 Td
(3405 ) 21.8426 Tj
0 -85.4403 Td
(3406   // Take first buffer off queue.) 166.0035 Tj
0 -94.9336 Td
(3407   acquire\(&idelock\);) 109.2129 Tj
0 -104.427 Td
(3408   if\(\(b = idequeue\) == 0\){) 135.4239 Tj
0 -113.9203 Td
(3409     release\(&idelock\);) 117.9499 Tj
0 -123.4137 Td
(3410     cprintf\("Spurious IDE interrupt.\\n"\);) 200.9517 Tj
0 -132.9071 Td
(3411     return;) 69.8962 Tj
0 -142.4004 Td
(3412   }) 34.9481 Tj
0 -151.8938 Td
(3413   idequeue = b->qnext;) 117.9499 Tj
0 -161.3871 Td
(3414 ) 21.8426 Tj
0 -170.8805 Td
(3415   // Read data if needed.) 131.0554 Tj
0 -180.3739 Td
(3416   if\(!\(b->flags & B_DIRTY\) && idewait\(1\) >= 0\)) 222.7942 Tj
0 -189.8672 Td
(3417     insl\(0x1f0, b->data, 512/4\);) 161.635 Tj
0 -199.3606 Td
(3418 ) 21.8426 Tj
0 -208.8539 Td
(3419   // Wake process waiting for this buf.) 192.2146 Tj
0 -218.3473 Td
(3420   b->flags |= B_VALID;) 117.9499 Tj
0 -227.8407 Td
(3421   b->flags &= ~B_DIRTY;) 122.3184 Tj
0 -237.334 Td
(3422   wakeup\(b\);) 74.2647 Tj
0 -246.8274 Td
(3423 ) 21.8426 Tj
0 -256.3207 Td
(3424   // Start disk on next buf in queue.) 183.4776 Tj
0 -265.8141 Td
(3425   if\(idequeue != 0\)) 104.8443 Tj
0 -275.3075 Td
(3426     idestart\(idequeue\);) 122.3184 Tj
0 -284.8008 Td
(3427 ) 21.8426 Tj
0 -294.2942 Td
(3428   release\(&idelock\);) 109.2129 Tj
0 -303.7875 Td
(3429 }) 26.2111 Tj
0 -313.2809 Td
(3430 ) 21.8426 Tj
0 -322.7743 Td
(3431 ) 21.8426 Tj
0 -332.2676 Td
(3432 ) 21.8426 Tj
0 -341.761 Td
(3433 ) 21.8426 Tj
0 -351.2543 Td
(3434 ) 21.8426 Tj
0 -360.7477 Td
(3435 ) 21.8426 Tj
0 -370.2411 Td
(3436 ) 21.8426 Tj
0 -379.7344 Td
(3437 ) 21.8426 Tj
0 -389.2278 Td
(3438 ) 21.8426 Tj
0 -398.7211 Td
(3439 ) 21.8426 Tj
0 -408.2145 Td
(3440 ) 21.8426 Tj
0 -417.7079 Td
(3441 ) 21.8426 Tj
0 -427.2012 Td
(3442 ) 21.8426 Tj
0 -436.6946 Td
(3443 ) 21.8426 Tj
0 -446.1879 Td
(3444 ) 21.8426 Tj
0 -455.6813 Td
(3445 ) 21.8426 Tj
0 -465.1747 Td
(3446 ) 21.8426 Tj
0 -474.668 Td
(3447 ) 21.8426 Tj
0 -484.1614 Td
(3448 ) 21.8426 Tj
0 -493.6547 Td
(3449 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 34) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/ide.c  Page 4) 157.2665 Tj
0 -28.4801 Td
(3450 // Sync buf with disk.) 117.9499 Tj
0 -37.9735 Td
(3451 // If B_DIRTY is set, write buf to disk, clear B_DIRTY, se\
t B_VALID.) 318.9016 Tj
0 -47.4668 Td
(3452 // Else if B_VALID is not set, read buf from disk, set B_V\
ALID.) 297.059 Tj
0 -56.9602 Td
(3453 void) 39.3166 Tj
0 -66.4535 Td
(3454 iderw\(struct buf *b\)) 109.2129 Tj
0 -75.9469 Td
(3455 {) 26.2111 Tj
0 -85.4403 Td
(3456   struct buf **pp;) 100.4758 Tj
0 -94.9336 Td
(3457 ) 21.8426 Tj
0 -104.427 Td
(3458   if\(!\(b->flags & B_BUSY\)\)) 135.4239 Tj
0 -113.9203 Td
(3459     panic\("iderw: buf not busy"\);) 166.0035 Tj
0 -123.4137 Td
(3460   if\(\(b->flags & \(B_VALID|B_DIRTY\)\) == B_VALID\)) 227.1628 Tj
0 -132.9071 Td
(3461     panic\("iderw: nothing to do"\);) 170.3721 Tj
0 -142.4004 Td
(3462   if\(b->dev != 0 && !havedisk1\)) 157.2665 Tj
0 -151.8938 Td
(3463     panic\("idrw: ide disk 1 not present"\);) 205.3202 Tj
0 -161.3871 Td
(3464 ) 21.8426 Tj
0 -170.8805 Td
(3465   acquire\(&idelock\);) 109.2129 Tj
0 -180.3739 Td
(3466 ) 21.8426 Tj
0 -189.8672 Td
(3467   // Append b to idequeue.) 135.4239 Tj
0 -199.3606 Td
(3468   b->qnext = 0;) 87.3703 Tj
0 -208.8539 Td
(3469   for\(pp=&idequeue; *pp; pp=&\(*pp\)->qnext\)) 205.3202 Tj
0 -218.3473 Td
(3470     ;) 43.6851 Tj
0 -227.8407 Td
(3471   *pp = b;) 65.5277 Tj
0 -237.334 Td
(3472 ) 21.8426 Tj
0 -246.8274 Td
(3473   // Start disk if necessary.) 148.5295 Tj
0 -256.3207 Td
(3474   if\(idequeue == b\)) 104.8443 Tj
0 -265.8141 Td
(3475     idestart\(b\);) 91.7388 Tj
0 -275.3075 Td
(3476 ) 21.8426 Tj
0 -284.8008 Td
(3477   // Wait for request to finish.) 161.635 Tj
0 -294.2942 Td
(3478   // Assuming will not sleep too long: ignore cp->killed.) 270.8479 Tj
0 -303.7875 Td
(3479   while\(\(b->flags & \(B_VALID|B_DIRTY\)\) != B_VALID\)) 240.2683 Tj
0 -313.2809 Td
(3480     sleep\(b, &idelock\);) 122.3184 Tj
0 -322.7743 Td
(3481 ) 21.8426 Tj
0 -332.2676 Td
(3482   release\(&idelock\);) 109.2129 Tj
0 -341.761 Td
(3483 }) 26.2111 Tj
0 -351.2543 Td
(3484 ) 21.8426 Tj
0 -360.7477 Td
(3485 ) 21.8426 Tj
0 -370.2411 Td
(3486 ) 21.8426 Tj
0 -379.7344 Td
(3487 ) 21.8426 Tj
0 -389.2278 Td
(3488 ) 21.8426 Tj
0 -398.7211 Td
(3489 ) 21.8426 Tj
0 -408.2145 Td
(3490 ) 21.8426 Tj
0 -417.7079 Td
(3491 ) 21.8426 Tj
0 -427.2012 Td
(3492 ) 21.8426 Tj
0 -436.6946 Td
(3493 ) 21.8426 Tj
0 -446.1879 Td
(3494 ) 21.8426 Tj
0 -455.6813 Td
(3495 ) 21.8426 Tj
0 -465.1747 Td
(3496 ) 21.8426 Tj
0 -474.668 Td
(3497 ) 21.8426 Tj
0 -484.1614 Td
(3498 ) 21.8426 Tj
0 -493.6547 Td
(3499 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 34) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 42 42
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/bio.c  Page 1) 157.2665 Tj
0 -28.4801 Td
(3500 // Buffer cache.) 91.7388 Tj
0 -37.9735 Td
(3501 //) 30.5796 Tj
0 -47.4668 Td
(3502 // The buffer cache is a linked list of buf structures hol\
ding) 292.6905 Tj
0 -56.9602 Td
(3503 // cached copies of disk block contents.  Caching disk blo\
cks) 288.322 Tj
0 -66.4535 Td
(3504 // in memory reduces the number of disk reads and also pro\
vides) 297.059 Tj
0 -75.9469 Td
(3505 // a synchronization point for disk blocks used by multipl\
e processes.) 327.6386 Tj
0 -85.4403 Td
(3506 //) 30.5796 Tj
0 -94.9336 Td
(3507 // Interface:) 78.6333 Tj
0 -104.427 Td
(3508 // * To get a buffer for a particular disk block, call bre\
ad.) 288.322 Tj
0 -113.9203 Td
(3509 // * After changing buffer data, call bwrite to flush it t\
o disk.) 305.796 Tj
0 -123.4137 Td
(3510 // * When done with the buffer, call brelse.) 214.0572 Tj
0 -132.9071 Td
(3511 // * Do not use the buffer after calling brelse.) 231.5313 Tj
0 -142.4004 Td
(3512 // * Only one process at a time can use a buffer,) 235.8998 Tj
0 -151.8938 Td
(3513 //     so do not keep them longer than necessary.) 235.8998 Tj
0 -161.3871 Td
(3514 //) 30.5796 Tj
0 -170.8805 Td
(3515 // The implementation uses three state flags internally:) 266.4794 Tj
0 -180.3739 Td
(3516 // * B_BUSY: the block has been returned from bread) 244.6368 Tj
0 -189.8672 Td
(3517 //     and has not been passed back to brelse.) 222.7942 Tj
0 -199.3606 Td
(3518 // * B_VALID: the buffer data has been initialized) 240.2683 Tj
0 -208.8539 Td
(3519 //     with the associated disk block contents.) 227.1628 Tj
0 -218.3473 Td
(3520 // * B_DIRTY: the buffer data has been modified) 227.1628 Tj
0 -227.8407 Td
(3521 //     and needs to be written to disk.) 192.2146 Tj
0 -237.334 Td
(3522 ) 21.8426 Tj
0 -246.8274 Td
(3523 #include "types.h") 100.4758 Tj
0 -256.3207 Td
(3524 #include "defs.h") 96.1073 Tj
0 -265.8141 Td
(3525 #include "param.h") 100.4758 Tj
0 -275.3075 Td
(3526 #include "spinlock.h") 113.5814 Tj
0 -284.8008 Td
(3527 #include "buf.h") 91.7388 Tj
0 -294.2942 Td
(3528 ) 21.8426 Tj
0 -303.7875 Td
(3529 struct {) 56.7907 Tj
0 -313.2809 Td
(3530   struct spinlock lock;) 122.3184 Tj
0 -322.7743 Td
(3531   struct buf buf[NBUF];) 122.3184 Tj
0 -332.2676 Td
(3532 ) 21.8426 Tj
0 -341.761 Td
(3533   // Linked list of all buffers, through prev/next.) 244.6368 Tj
0 -351.2543 Td
(3534   // head.next is most recently used.) 183.4776 Tj
0 -360.7477 Td
(3535   struct buf head;) 100.4758 Tj
0 -370.2411 Td
(3536 } bcache;) 61.1592 Tj
0 -379.7344 Td
(3537 ) 21.8426 Tj
0 -389.2278 Td
(3538 void) 39.3166 Tj
0 -398.7211 Td
(3539 binit\(void\)) 69.8962 Tj
0 -408.2145 Td
(3540 {) 26.2111 Tj
0 -417.7079 Td
(3541   struct buf *b;) 91.7388 Tj
0 -427.2012 Td
(3542 ) 21.8426 Tj
0 -436.6946 Td
(3543   initlock\(&bcache.lock, "bcache"\);) 174.7406 Tj
0 -446.1879 Td
(3544 ) 21.8426 Tj
0 -455.6813 Td
(3545 ) 21.8426 Tj
0 -465.1747 Td
(3546 ) 21.8426 Tj
0 -474.668 Td
(3547 ) 21.8426 Tj
0 -484.1614 Td
(3548 ) 21.8426 Tj
0 -493.6547 Td
(3549 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 35) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/bio.c  Page 2) 157.2665 Tj
0 -28.4801 Td
(3550   // Create linked list of buffers) 170.3721 Tj
0 -37.9735 Td
(3551   bcache.head.prev = &bcache.head;) 170.3721 Tj
0 -47.4668 Td
(3552   bcache.head.next = &bcache.head;) 170.3721 Tj
0 -56.9602 Td
(3553   for\(b = bcache.buf; b < bcache.buf+NBUF; b++\){) 231.5313 Tj
0 -66.4535 Td
(3554     b->next = bcache.head.next;) 157.2665 Tj
0 -75.9469 Td
(3555     b->prev = &bcache.head;) 139.7925 Tj
0 -85.4403 Td
(3556     b->dev = -1;) 91.7388 Tj
0 -94.9336 Td
(3557     bcache.head.next->prev = b;) 157.2665 Tj
0 -104.427 Td
(3558     bcache.head.next = b;) 131.0554 Tj
0 -113.9203 Td
(3559   }) 34.9481 Tj
0 -123.4137 Td
(3560 }) 26.2111 Tj
0 -132.9071 Td
(3561 ) 21.8426 Tj
0 -142.4004 Td
(3562 // Look through buffer cache for sector on device dev.) 257.7424 Tj
0 -151.8938 Td
(3563 // If not found, allocate fresh block.) 187.8461 Tj
0 -161.3871 Td
(3564 // In either case, return locked buffer.) 196.5831 Tj
0 -170.8805 Td
(3565 static struct buf*) 100.4758 Tj
0 -180.3739 Td
(3566 bget\(uint dev, uint sector\)) 139.7925 Tj
0 -189.8672 Td
(3567 {) 26.2111 Tj
0 -199.3606 Td
(3568   struct buf *b;) 91.7388 Tj
0 -208.8539 Td
(3569 ) 21.8426 Tj
0 -218.3473 Td
(3570   acquire\(&bcache.lock\);) 126.6869 Tj
0 -227.8407 Td
(3571 ) 21.8426 Tj
0 -237.334 Td
(3572  loop:) 48.0537 Tj
0 -246.8274 Td
(3573   // Try for cached block.) 135.4239 Tj
0 -256.3207 Td
(3574   for\(b = bcache.head.next; b != &bcache.head; b = b->nex\
t\){) 283.9534 Tj
0 -265.8141 Td
(3575     if\(b->dev == dev && b->sector == sector\){) 218.4257 Tj
0 -275.3075 Td
(3576       if\(!\(b->flags & B_BUSY\)\){) 157.2665 Tj
0 -284.8008 Td
(3577         b->flags |= B_BUSY;) 139.7925 Tj
0 -294.2942 Td
(3578         release\(&bcache.lock\);) 152.898 Tj
0 -303.7875 Td
(3579         return b;) 96.1073 Tj
0 -313.2809 Td
(3580       }) 52.4222 Tj
0 -322.7743 Td
(3581       sleep\(b, &bcache.lock\);) 148.5295 Tj
0 -332.2676 Td
(3582       goto loop;) 91.7388 Tj
0 -341.761 Td
(3583     }) 43.6851 Tj
0 -351.2543 Td
(3584   }) 34.9481 Tj
0 -360.7477 Td
(3585 ) 21.8426 Tj
0 -370.2411 Td
(3586   // Allocate fresh block.) 135.4239 Tj
0 -379.7344 Td
(3587   for\(b = bcache.head.prev; b != &bcache.head; b = b->pre\
v\){) 283.9534 Tj
0 -389.2278 Td
(3588     if\(\(b->flags & B_BUSY\) == 0\){) 166.0035 Tj
0 -398.7211 Td
(3589       b->dev = dev;) 104.8443 Tj
0 -408.2145 Td
(3590       b->sector = sector;) 131.0554 Tj
0 -417.7079 Td
(3591       b->flags = B_BUSY;) 126.6869 Tj
0 -427.2012 Td
(3592       release\(&bcache.lock\);) 144.161 Tj
0 -436.6946 Td
(3593       return b;) 87.3703 Tj
0 -446.1879 Td
(3594     }) 43.6851 Tj
0 -455.6813 Td
(3595   }) 34.9481 Tj
0 -465.1747 Td
(3596   panic\("bget: no buffers"\);) 144.161 Tj
0 -474.668 Td
(3597 }) 26.2111 Tj
0 -484.1614 Td
(3598 ) 21.8426 Tj
0 -493.6547 Td
(3599 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 35) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 43 43
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
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{} settransfer
0 0 612 792 re
W
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[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/bio.c  Page 3) 157.2665 Tj
0 -28.4801 Td
(3600 // Return a B_BUSY buf with the contents of the indicated \
disk sector.) 327.6386 Tj
0 -37.9735 Td
(3601 struct buf*) 69.8962 Tj
0 -47.4668 Td
(3602 bread\(uint dev, uint sector\)) 144.161 Tj
0 -56.9602 Td
(3603 {) 26.2111 Tj
0 -66.4535 Td
(3604   struct buf *b;) 91.7388 Tj
0 -75.9469 Td
(3605 ) 21.8426 Tj
0 -85.4403 Td
(3606   b = bget\(dev, sector\);) 126.6869 Tj
0 -94.9336 Td
(3607   if\(!\(b->flags & B_VALID\)\)) 139.7925 Tj
0 -104.427 Td
(3608     iderw\(b\);) 78.6333 Tj
0 -113.9203 Td
(3609   return b;) 69.8962 Tj
0 -123.4137 Td
(3610 }) 26.2111 Tj
0 -132.9071 Td
(3611 ) 21.8426 Tj
0 -142.4004 Td
(3612 // Write b's contents to disk.  Must be locked.) 227.1628 Tj
0 -151.8938 Td
(3613 void) 39.3166 Tj
0 -161.3871 Td
(3614 bwrite\(struct buf *b\)) 113.5814 Tj
0 -170.8805 Td
(3615 {) 26.2111 Tj
0 -180.3739 Td
(3616   if\(\(b->flags & B_BUSY\) == 0\)) 152.898 Tj
0 -189.8672 Td
(3617     panic\("bwrite"\);) 109.2129 Tj
0 -199.3606 Td
(3618   b->flags |= B_DIRTY;) 117.9499 Tj
0 -208.8539 Td
(3619   iderw\(b\);) 69.8962 Tj
0 -218.3473 Td
(3620 }) 26.2111 Tj
0 -227.8407 Td
(3621 ) 21.8426 Tj
0 -237.334 Td
(3622 // Release the buffer b.) 126.6869 Tj
0 -246.8274 Td
(3623 void) 39.3166 Tj
0 -256.3207 Td
(3624 brelse\(struct buf *b\)) 113.5814 Tj
0 -265.8141 Td
(3625 {) 26.2111 Tj
0 -275.3075 Td
(3626   if\(\(b->flags & B_BUSY\) == 0\)) 152.898 Tj
0 -284.8008 Td
(3627     panic\("brelse"\);) 109.2129 Tj
0 -294.2942 Td
(3628 ) 21.8426 Tj
0 -303.7875 Td
(3629   acquire\(&bcache.lock\);) 126.6869 Tj
0 -313.2809 Td
(3630 ) 21.8426 Tj
0 -322.7743 Td
(3631   b->next->prev = b->prev;) 135.4239 Tj
0 -332.2676 Td
(3632   b->prev->next = b->next;) 135.4239 Tj
0 -341.761 Td
(3633   b->next = bcache.head.next;) 148.5295 Tj
0 -351.2543 Td
(3634   b->prev = &bcache.head;) 131.0554 Tj
0 -360.7477 Td
(3635   bcache.head.next->prev = b;) 148.5295 Tj
0 -370.2411 Td
(3636   bcache.head.next = b;) 122.3184 Tj
0 -379.7344 Td
(3637 ) 21.8426 Tj
0 -389.2278 Td
(3638   b->flags &= ~B_BUSY;) 117.9499 Tj
0 -398.7211 Td
(3639   wakeup\(b\);) 74.2647 Tj
0 -408.2145 Td
(3640 ) 21.8426 Tj
0 -417.7079 Td
(3641   release\(&bcache.lock\);) 126.6869 Tj
0 -427.2012 Td
(3642 }) 26.2111 Tj
0 -436.6946 Td
(3643 ) 21.8426 Tj
0 -446.1879 Td
(3644 ) 21.8426 Tj
0 -455.6813 Td
(3645 ) 21.8426 Tj
0 -465.1747 Td
(3646 ) 21.8426 Tj
0 -474.668 Td
(3647 ) 21.8426 Tj
0 -484.1614 Td
(3648 ) 21.8426 Tj
0 -493.6547 Td
(3649 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 36) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/fs.c  Page 1) 152.898 Tj
0 -28.4801 Td
(3650 // File system implementation.  Four layers:) 214.0572 Tj
0 -37.9735 Td
(3651 //   + Blocks: allocator for raw disk blocks.) 218.4257 Tj
0 -47.4668 Td
(3652 //   + Files: inode allocator, reading, writing, metadata.) 275.2164 Tj
0 -56.9602 Td
(3653 //   + Directories: inode with special contents \(list of \
other inodes!\)) 332.0071 Tj
0 -66.4535 Td
(3654 //   + Names: paths like /usr/rtm/xv6/fs.c for convenient \
naming.) 305.796 Tj
0 -75.9469 Td
(3655 //) 30.5796 Tj
0 -85.4403 Td
(3656 // Disk layout is: superblock, inodes, block in-use bitmap\
, data blocks.) 336.3756 Tj
0 -94.9336 Td
(3657 //) 30.5796 Tj
0 -104.427 Td
(3658 // This file contains the low-level file system manipulati\
on) 283.9534 Tj
0 -113.9203 Td
(3659 // routines.  The \(higher-level\) system call implementat\
ions) 283.9534 Tj
0 -123.4137 Td
(3660 // are in sysfile.c.) 109.2129 Tj
0 -132.9071 Td
(3661 ) 21.8426 Tj
0 -142.4004 Td
(3662 #include "types.h") 100.4758 Tj
0 -151.8938 Td
(3663 #include "defs.h") 96.1073 Tj
0 -161.3871 Td
(3664 #include "param.h") 100.4758 Tj
0 -170.8805 Td
(3665 #include "stat.h") 96.1073 Tj
0 -180.3739 Td
(3666 #include "mmu.h") 91.7388 Tj
0 -189.8672 Td
(3667 #include "proc.h") 96.1073 Tj
0 -199.3606 Td
(3668 #include "spinlock.h") 113.5814 Tj
0 -208.8539 Td
(3669 #include "buf.h") 91.7388 Tj
0 -218.3473 Td
(3670 #include "fs.h") 87.3703 Tj
0 -227.8407 Td
(3671 #include "file.h") 96.1073 Tj
0 -237.334 Td
(3672 ) 21.8426 Tj
0 -246.8274 Td
(3673 #define min\(a, b\) \(\(a\) < \(b\) ? \(a\) : \(b\)\)) 200.9517 Tj
0 -256.3207 Td
(3674 static void itrunc\(struct inode*\);) 170.3721 Tj
0 -265.8141 Td
(3675 ) 21.8426 Tj
0 -275.3075 Td
(3676 // Read the super block.) 126.6869 Tj
0 -284.8008 Td
(3677 static void) 69.8962 Tj
0 -294.2942 Td
(3678 readsb\(int dev, struct superblock *sb\)) 187.8461 Tj
0 -303.7875 Td
(3679 {) 26.2111 Tj
0 -313.2809 Td
(3680   struct buf *bp;) 96.1073 Tj
0 -322.7743 Td
(3681 ) 21.8426 Tj
0 -332.2676 Td
(3682   bp = bread\(dev, 1\);) 113.5814 Tj
0 -341.761 Td
(3683   memmove\(sb, bp->data, sizeof\(*sb\)\);) 183.4776 Tj
0 -351.2543 Td
(3684   brelse\(bp\);) 78.6333 Tj
0 -360.7477 Td
(3685 }) 26.2111 Tj
0 -370.2411 Td
(3686 ) 21.8426 Tj
0 -379.7344 Td
(3687 // Zero a block.) 91.7388 Tj
0 -389.2278 Td
(3688 static void) 69.8962 Tj
0 -398.7211 Td
(3689 bzero\(int dev, int bno\)) 122.3184 Tj
0 -408.2145 Td
(3690 {) 26.2111 Tj
0 -417.7079 Td
(3691   struct buf *bp;) 96.1073 Tj
0 -427.2012 Td
(3692 ) 21.8426 Tj
0 -436.6946 Td
(3693   bp = bread\(dev, bno\);) 122.3184 Tj
0 -446.1879 Td
(3694   memset\(bp->data, 0, BSIZE\);) 148.5295 Tj
0 -455.6813 Td
(3695   bwrite\(bp\);) 78.6333 Tj
0 -465.1747 Td
(3696   brelse\(bp\);) 78.6333 Tj
0 -474.668 Td
(3697 }) 26.2111 Tj
0 -484.1614 Td
(3698 ) 21.8426 Tj
0 -493.6547 Td
(3699 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 36) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
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-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
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0 0 612 792 re
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q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
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/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/fs.c  Page 2) 152.898 Tj
0 -28.4801 Td
(3700 // Blocks.) 65.5277 Tj
0 -37.9735 Td
(3701 ) 21.8426 Tj
0 -47.4668 Td
(3702 // Allocate a disk block.) 131.0554 Tj
0 -56.9602 Td
(3703 static uint) 69.8962 Tj
0 -66.4535 Td
(3704 balloc\(uint dev\)) 91.7388 Tj
0 -75.9469 Td
(3705 {) 26.2111 Tj
0 -85.4403 Td
(3706   int b, bi, m;) 87.3703 Tj
0 -94.9336 Td
(3707   struct buf *bp;) 96.1073 Tj
0 -104.427 Td
(3708   struct superblock sb;) 122.3184 Tj
0 -113.9203 Td
(3709 ) 21.8426 Tj
0 -123.4137 Td
(3710   bp = 0;) 61.1592 Tj
0 -132.9071 Td
(3711   readsb\(dev, &sb\);) 104.8443 Tj
0 -142.4004 Td
(3712   for\(b = 0; b < sb.size; b += BPB\){) 179.1091 Tj
0 -151.8938 Td
(3713     bp = bread\(dev, BBLOCK\(b, sb.ninodes\)\);) 209.6887 Tj
0 -161.3871 Td
(3714     for\(bi = 0; bi < BPB; bi++\){) 161.635 Tj
0 -170.8805 Td
(3715       m = 1 << \(bi % 8\);) 126.6869 Tj
0 -180.3739 Td
(3716       if\(\(bp->data[bi/8] & m\) == 0\){  // Is block free\
?) 262.1109 Tj
0 -189.8672 Td
(3717         bp->data[bi/8] |= m;  // Mark block in use on disk\
.) 279.5849 Tj
0 -199.3606 Td
(3718         bwrite\(bp\);) 104.8443 Tj
0 -208.8539 Td
(3719         brelse\(bp\);) 104.8443 Tj
0 -218.3473 Td
(3720         return b + bi;) 117.9499 Tj
0 -227.8407 Td
(3721       }) 52.4222 Tj
0 -237.334 Td
(3722     }) 43.6851 Tj
0 -246.8274 Td
(3723     brelse\(bp\);) 87.3703 Tj
0 -256.3207 Td
(3724   }) 34.9481 Tj
0 -265.8141 Td
(3725   panic\("balloc: out of blocks"\);) 166.0035 Tj
0 -275.3075 Td
(3726 }) 26.2111 Tj
0 -284.8008 Td
(3727 ) 21.8426 Tj
0 -294.2942 Td
(3728 // Free a disk block.) 113.5814 Tj
0 -303.7875 Td
(3729 static void) 69.8962 Tj
0 -313.2809 Td
(3730 bfree\(int dev, uint b\)) 117.9499 Tj
0 -322.7743 Td
(3731 {) 26.2111 Tj
0 -332.2676 Td
(3732   struct buf *bp;) 96.1073 Tj
0 -341.761 Td
(3733   struct superblock sb;) 122.3184 Tj
0 -351.2543 Td
(3734   int bi, m;) 74.2647 Tj
0 -360.7477 Td
(3735 ) 21.8426 Tj
0 -370.2411 Td
(3736   bzero\(dev, b\);) 91.7388 Tj
0 -379.7344 Td
(3737 ) 21.8426 Tj
0 -389.2278 Td
(3738   readsb\(dev, &sb\);) 104.8443 Tj
0 -398.7211 Td
(3739   bp = bread\(dev, BBLOCK\(b, sb.ninodes\)\);) 200.9517 Tj
0 -408.2145 Td
(3740   bi = b % BPB;) 87.3703 Tj
0 -417.7079 Td
(3741   m = 1 << \(bi % 8\);) 109.2129 Tj
0 -427.2012 Td
(3742   if\(\(bp->data[bi/8] & m\) == 0\)) 157.2665 Tj
0 -436.6946 Td
(3743     panic\("freeing free block"\);) 161.635 Tj
0 -446.1879 Td
(3744   bp->data[bi/8] &= ~m;  // Mark block free on disk.) 249.0053 Tj
0 -455.6813 Td
(3745   bwrite\(bp\);) 78.6333 Tj
0 -465.1747 Td
(3746   brelse\(bp\);) 78.6333 Tj
0 -474.668 Td
(3747 }) 26.2111 Tj
0 -484.1614 Td
(3748 ) 21.8426 Tj
0 -493.6547 Td
(3749 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 37) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
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/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
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[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/fs.c  Page 3) 152.898 Tj
0 -28.4801 Td
(3750 // Inodes.) 65.5277 Tj
0 -37.9735 Td
(3751 //) 30.5796 Tj
0 -47.4668 Td
(3752 // An inode is a single, unnamed file in the file system.) 270.8479 Tj
0 -56.9602 Td
(3753 // The inode disk structure holds metadata \(the type, dev\
ice numbers,) 323.2701 Tj
0 -66.4535 Td
(3754 // and data size\) along with a list of blocks where the a\
ssociated) 310.1645 Tj
0 -75.9469 Td
(3755 // data can be found.) 113.5814 Tj
0 -85.4403 Td
(3756 //) 30.5796 Tj
0 -94.9336 Td
(3757 // The inodes are laid out sequentially on disk immediatel\
y after) 305.796 Tj
0 -104.427 Td
(3758 // the superblock.  The kernel keeps a cache of the in-use) 275.2164 Tj
0 -113.9203 Td
(3759 // on-disk structures to provide a place for synchronizing\
 access) 305.796 Tj
0 -123.4137 Td
(3760 // to inodes shared between multiple processes.) 227.1628 Tj
0 -132.9071 Td
(3761 //) 30.5796 Tj
0 -142.4004 Td
(3762 // ip->ref counts the number of pointer references to this\
 cached) 305.796 Tj
0 -151.8938 Td
(3763 // inode; references are typically kept in struct file and\
 in cp->cwd.) 327.6386 Tj
0 -161.3871 Td
(3764 // When ip->ref falls to zero, the inode is no longer cach\
ed.) 288.322 Tj
0 -170.8805 Td
(3765 // It is an error to use an inode without holding a refere\
nce to it.) 318.9016 Tj
0 -180.3739 Td
(3766 //) 30.5796 Tj
0 -189.8672 Td
(3767 // Processes are only allowed to read and write inode) 253.3738 Tj
0 -199.3606 Td
(3768 // metadata and contents when holding the inode's lock,) 262.1109 Tj
0 -208.8539 Td
(3769 // represented by the I_BUSY flag in the in-memory copy.) 266.4794 Tj
0 -218.3473 Td
(3770 // Because inode locks are held during disk accesses,) 253.3738 Tj
0 -227.8407 Td
(3771 // they are implemented using a flag rather than with) 253.3738 Tj
0 -237.334 Td
(3772 // spin locks.  Callers are responsible for locking) 244.6368 Tj
0 -246.8274 Td
(3773 // inodes before passing them to routines in this file; le\
aving) 297.059 Tj
0 -256.3207 Td
(3774 // this responsibility with the caller makes it possible f\
or them) 305.796 Tj
0 -265.8141 Td
(3775 // to create arbitrarily-sized atomic operations.) 235.8998 Tj
0 -275.3075 Td
(3776 //) 30.5796 Tj
0 -284.8008 Td
(3777 // To give maximum control over locking to the callers,) 262.1109 Tj
0 -294.2942 Td
(3778 // the routines in this file that return inode pointers) 262.1109 Tj
0 -303.7875 Td
(3779 // return pointers to *unlocked* inodes.  It is the caller\
s') 283.9534 Tj
0 -313.2809 Td
(3780 // responsibility to lock them before using them.  A non-z\
ero) 288.322 Tj
0 -322.7743 Td
(3781 // ip->ref keeps these unlocked inodes in the cache.) 249.0053 Tj
0 -332.2676 Td
(3782 ) 21.8426 Tj
0 -341.761 Td
(3783 struct {) 56.7907 Tj
0 -351.2543 Td
(3784   struct spinlock lock;) 122.3184 Tj
0 -360.7477 Td
(3785   struct inode inode[NINODE];) 148.5295 Tj
0 -370.2411 Td
(3786 } icache;) 61.1592 Tj
0 -379.7344 Td
(3787 ) 21.8426 Tj
0 -389.2278 Td
(3788 void) 39.3166 Tj
0 -398.7211 Td
(3789 iinit\(void\)) 69.8962 Tj
0 -408.2145 Td
(3790 {) 26.2111 Tj
0 -417.7079 Td
(3791   initlock\(&icache.lock, "icache"\);) 174.7406 Tj
0 -427.2012 Td
(3792 }) 26.2111 Tj
0 -436.6946 Td
(3793 ) 21.8426 Tj
0 -446.1879 Td
(3794 static struct inode* iget\(uint dev, uint inum\);) 227.1628 Tj
0 -455.6813 Td
(3795 ) 21.8426 Tj
0 -465.1747 Td
(3796 ) 21.8426 Tj
0 -474.668 Td
(3797 ) 21.8426 Tj
0 -484.1614 Td
(3798 ) 21.8426 Tj
0 -493.6547 Td
(3799 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 37) 34.9481 Tj
Q
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%%PageTrailer
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%%Page: 45 45
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-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
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180 3960 5760 3460 re
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0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/fs.c  Page 4) 152.898 Tj
0 -28.4801 Td
(3800 // Allocate a new inode with the given type on device dev.) 275.2164 Tj
0 -37.9735 Td
(3801 struct inode*) 78.6333 Tj
0 -47.4668 Td
(3802 ialloc\(uint dev, short type\)) 144.161 Tj
0 -56.9602 Td
(3803 {) 26.2111 Tj
0 -66.4535 Td
(3804   int inum;) 69.8962 Tj
0 -75.9469 Td
(3805   struct buf *bp;) 96.1073 Tj
0 -85.4403 Td
(3806   struct dinode *dip;) 113.5814 Tj
0 -94.9336 Td
(3807   struct superblock sb;) 122.3184 Tj
0 -104.427 Td
(3808 ) 21.8426 Tj
0 -113.9203 Td
(3809   readsb\(dev, &sb\);) 104.8443 Tj
0 -123.4137 Td
(3810   for\(inum = 1; inum < sb.ninodes; inum++\){  // loop ove\
r inode blocks) 327.6386 Tj
0 -132.9071 Td
(3811     bp = bread\(dev, IBLOCK\(inum\)\);) 170.3721 Tj
0 -142.4004 Td
(3812     dip = \(struct dinode*\)bp->data + inum%IPB;) 222.7942 Tj
0 -151.8938 Td
(3813     if\(dip->type == 0\){  // a free inode) 196.5831 Tj
0 -161.3871 Td
(3814       memset\(dip, 0, sizeof\(*dip\)\);) 174.7406 Tj
0 -170.8805 Td
(3815       dip->type = type;) 122.3184 Tj
0 -180.3739 Td
(3816       bwrite\(bp\);   // mark it allocated on the disk) 249.0053 Tj
0 -189.8672 Td
(3817       brelse\(bp\);) 96.1073 Tj
0 -199.3606 Td
(3818       return iget\(dev, inum\);) 148.5295 Tj
0 -208.8539 Td
(3819     }) 43.6851 Tj
0 -218.3473 Td
(3820     brelse\(bp\);) 87.3703 Tj
0 -227.8407 Td
(3821   }) 34.9481 Tj
0 -237.334 Td
(3822   panic\("ialloc: no inodes"\);) 148.5295 Tj
0 -246.8274 Td
(3823 }) 26.2111 Tj
0 -256.3207 Td
(3824 ) 21.8426 Tj
0 -265.8141 Td
(3825 // Copy inode, which has changed, from memory to disk.) 257.7424 Tj
0 -275.3075 Td
(3826 void) 39.3166 Tj
0 -284.8008 Td
(3827 iupdate\(struct inode *ip\)) 131.0554 Tj
0 -294.2942 Td
(3828 {) 26.2111 Tj
0 -303.7875 Td
(3829   struct buf *bp;) 96.1073 Tj
0 -313.2809 Td
(3830   struct dinode *dip;) 113.5814 Tj
0 -322.7743 Td
(3831 ) 21.8426 Tj
0 -332.2676 Td
(3832   bp = bread\(ip->dev, IBLOCK\(ip->inum\)\);) 196.5831 Tj
0 -341.761 Td
(3833   dip = \(struct dinode*\)bp->data + ip->inum%IPB;) 231.5313 Tj
0 -351.2543 Td
(3834   dip->type = ip->type;) 122.3184 Tj
0 -360.7477 Td
(3835   dip->major = ip->major;) 131.0554 Tj
0 -370.2411 Td
(3836   dip->minor = ip->minor;) 131.0554 Tj
0 -379.7344 Td
(3837   dip->nlink = ip->nlink;) 131.0554 Tj
0 -389.2278 Td
(3838   dip->size = ip->size;) 122.3184 Tj
0 -398.7211 Td
(3839   memmove\(dip->addrs, ip->addrs, sizeof\(ip->addrs\)\);) 249.0053 Tj
0 -408.2145 Td
(3840   bwrite\(bp\);) 78.6333 Tj
0 -417.7079 Td
(3841   brelse\(bp\);) 78.6333 Tj
0 -427.2012 Td
(3842 }) 26.2111 Tj
0 -436.6946 Td
(3843 ) 21.8426 Tj
0 -446.1879 Td
(3844 ) 21.8426 Tj
0 -455.6813 Td
(3845 ) 21.8426 Tj
0 -465.1747 Td
(3846 ) 21.8426 Tj
0 -474.668 Td
(3847 ) 21.8426 Tj
0 -484.1614 Td
(3848 ) 21.8426 Tj
0 -493.6547 Td
(3849 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 38) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/fs.c  Page 5) 152.898 Tj
0 -28.4801 Td
(3850 // Find the inode with number inum on device dev) 231.5313 Tj
0 -37.9735 Td
(3851 // and return the in-memory copy.) 166.0035 Tj
0 -47.4668 Td
(3852 static struct inode*) 109.2129 Tj
0 -56.9602 Td
(3853 iget\(uint dev, uint inum\)) 131.0554 Tj
0 -66.4535 Td
(3854 {) 26.2111 Tj
0 -75.9469 Td
(3855   struct inode *ip, *empty;) 139.7925 Tj
0 -85.4403 Td
(3856 ) 21.8426 Tj
0 -94.9336 Td
(3857   acquire\(&icache.lock\);) 126.6869 Tj
0 -104.427 Td
(3858 ) 21.8426 Tj
0 -113.9203 Td
(3859   // Try for cached inode.) 135.4239 Tj
0 -123.4137 Td
(3860   empty = 0;) 74.2647 Tj
0 -132.9071 Td
(3861   for\(ip = &icache.inode[0]; ip < &icache.inode[NINODE]; \
ip++\){) 297.059 Tj
0 -142.4004 Td
(3862     if\(ip->ref > 0 && ip->dev == dev && ip->inum == inum\)\
{) 275.2164 Tj
0 -151.8938 Td
(3863       ip->ref++;) 91.7388 Tj
0 -161.3871 Td
(3864       release\(&icache.lock\);) 144.161 Tj
0 -170.8805 Td
(3865       return ip;) 91.7388 Tj
0 -180.3739 Td
(3866     }) 43.6851 Tj
0 -189.8672 Td
(3867     if\(empty == 0 && ip->ref == 0\)    // Remember empty \
slot.) 288.322 Tj
0 -199.3606 Td
(3868       empty = ip;) 96.1073 Tj
0 -208.8539 Td
(3869   }) 34.9481 Tj
0 -218.3473 Td
(3870 ) 21.8426 Tj
0 -227.8407 Td
(3871   // Allocate fresh inode.) 135.4239 Tj
0 -237.334 Td
(3872   if\(empty == 0\)) 91.7388 Tj
0 -246.8274 Td
(3873     panic\("iget: no inodes"\);) 148.5295 Tj
0 -256.3207 Td
(3874 ) 21.8426 Tj
0 -265.8141 Td
(3875   ip = empty;) 78.6333 Tj
0 -275.3075 Td
(3876   ip->dev = dev;) 91.7388 Tj
0 -284.8008 Td
(3877   ip->inum = inum;) 100.4758 Tj
0 -294.2942 Td
(3878   ip->ref = 1;) 83.0018 Tj
0 -303.7875 Td
(3879   ip->flags = 0;) 91.7388 Tj
0 -313.2809 Td
(3880   release\(&icache.lock\);) 126.6869 Tj
0 -322.7743 Td
(3881 ) 21.8426 Tj
0 -332.2676 Td
(3882   return ip;) 74.2647 Tj
0 -341.761 Td
(3883 }) 26.2111 Tj
0 -351.2543 Td
(3884 ) 21.8426 Tj
0 -360.7477 Td
(3885 // Increment reference count for ip.) 179.1091 Tj
0 -370.2411 Td
(3886 // Returns ip to enable ip = idup\(ip1\) idiom.) 218.4257 Tj
0 -379.7344 Td
(3887 struct inode*) 78.6333 Tj
0 -389.2278 Td
(3888 idup\(struct inode *ip\)) 117.9499 Tj
0 -398.7211 Td
(3889 {) 26.2111 Tj
0 -408.2145 Td
(3890   acquire\(&icache.lock\);) 126.6869 Tj
0 -417.7079 Td
(3891   ip->ref++;) 74.2647 Tj
0 -427.2012 Td
(3892   release\(&icache.lock\);) 126.6869 Tj
0 -436.6946 Td
(3893   return ip;) 74.2647 Tj
0 -446.1879 Td
(3894 }) 26.2111 Tj
0 -455.6813 Td
(3895 ) 21.8426 Tj
0 -465.1747 Td
(3896 ) 21.8426 Tj
0 -474.668 Td
(3897 ) 21.8426 Tj
0 -484.1614 Td
(3898 ) 21.8426 Tj
0 -493.6547 Td
(3899 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 38) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 46 46
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
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0 J
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1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
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0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/fs.c  Page 6) 152.898 Tj
0 -28.4801 Td
(3900 // Lock the given inode.) 126.6869 Tj
0 -37.9735 Td
(3901 void) 39.3166 Tj
0 -47.4668 Td
(3902 ilock\(struct inode *ip\)) 122.3184 Tj
0 -56.9602 Td
(3903 {) 26.2111 Tj
0 -66.4535 Td
(3904   struct buf *bp;) 96.1073 Tj
0 -75.9469 Td
(3905   struct dinode *dip;) 113.5814 Tj
0 -85.4403 Td
(3906 ) 21.8426 Tj
0 -94.9336 Td
(3907   if\(ip == 0 || ip->ref < 1\)) 144.161 Tj
0 -104.427 Td
(3908     panic\("ilock"\);) 104.8443 Tj
0 -113.9203 Td
(3909 ) 21.8426 Tj
0 -123.4137 Td
(3910   acquire\(&icache.lock\);) 126.6869 Tj
0 -132.9071 Td
(3911   while\(ip->flags & I_BUSY\)) 139.7925 Tj
0 -142.4004 Td
(3912     sleep\(ip, &icache.lock\);) 144.161 Tj
0 -151.8938 Td
(3913   ip->flags |= I_BUSY;) 117.9499 Tj
0 -161.3871 Td
(3914   release\(&icache.lock\);) 126.6869 Tj
0 -170.8805 Td
(3915 ) 21.8426 Tj
0 -180.3739 Td
(3916   if\(!\(ip->flags & I_VALID\)\){) 148.5295 Tj
0 -189.8672 Td
(3917     bp = bread\(ip->dev, IBLOCK\(ip->inum\)\);) 205.3202 Tj
0 -199.3606 Td
(3918     dip = \(struct dinode*\)bp->data + ip->inum%IPB;) 240.2683 Tj
0 -208.8539 Td
(3919     ip->type = dip->type;) 131.0554 Tj
0 -218.3473 Td
(3920     ip->major = dip->major;) 139.7925 Tj
0 -227.8407 Td
(3921     ip->minor = dip->minor;) 139.7925 Tj
0 -237.334 Td
(3922     ip->nlink = dip->nlink;) 139.7925 Tj
0 -246.8274 Td
(3923     ip->size = dip->size;) 131.0554 Tj
0 -256.3207 Td
(3924     memmove\(ip->addrs, dip->addrs, sizeof\(ip->addrs\)\);) 257.7424 Tj
0 -265.8141 Td
(3925     brelse\(bp\);) 87.3703 Tj
0 -275.3075 Td
(3926     ip->flags |= I_VALID;) 131.0554 Tj
0 -284.8008 Td
(3927     if\(ip->type == 0\)) 113.5814 Tj
0 -294.2942 Td
(3928       panic\("ilock: no type"\);) 152.898 Tj
0 -303.7875 Td
(3929   }) 34.9481 Tj
0 -313.2809 Td
(3930 }) 26.2111 Tj
0 -322.7743 Td
(3931 ) 21.8426 Tj
0 -332.2676 Td
(3932 // Unlock the given inode.) 135.4239 Tj
0 -341.761 Td
(3933 void) 39.3166 Tj
0 -351.2543 Td
(3934 iunlock\(struct inode *ip\)) 131.0554 Tj
0 -360.7477 Td
(3935 {) 26.2111 Tj
0 -370.2411 Td
(3936   if\(ip == 0 || !\(ip->flags & I_BUSY\) || ip->ref < 1\)) 253.3738 Tj
0 -379.7344 Td
(3937     panic\("iunlock"\);) 113.5814 Tj
0 -389.2278 Td
(3938 ) 21.8426 Tj
0 -398.7211 Td
(3939   acquire\(&icache.lock\);) 126.6869 Tj
0 -408.2145 Td
(3940   ip->flags &= ~I_BUSY;) 122.3184 Tj
0 -417.7079 Td
(3941   wakeup\(ip\);) 78.6333 Tj
0 -427.2012 Td
(3942   release\(&icache.lock\);) 126.6869 Tj
0 -436.6946 Td
(3943 }) 26.2111 Tj
0 -446.1879 Td
(3944 ) 21.8426 Tj
0 -455.6813 Td
(3945 ) 21.8426 Tj
0 -465.1747 Td
(3946 ) 21.8426 Tj
0 -474.668 Td
(3947 ) 21.8426 Tj
0 -484.1614 Td
(3948 ) 21.8426 Tj
0 -493.6547 Td
(3949 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 39) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/fs.c  Page 7) 152.898 Tj
0 -28.4801 Td
(3950 // Caller holds reference to unlocked ip.  Drop reference.) 275.2164 Tj
0 -37.9735 Td
(3951 void) 39.3166 Tj
0 -47.4668 Td
(3952 iput\(struct inode *ip\)) 117.9499 Tj
0 -56.9602 Td
(3953 {) 26.2111 Tj
0 -66.4535 Td
(3954   acquire\(&icache.lock\);) 126.6869 Tj
0 -75.9469 Td
(3955   if\(ip->ref == 1 && \(ip->flags & I_VALID\) && ip->nlink\
 == 0\){) 292.6905 Tj
0 -85.4403 Td
(3956     // inode is no longer used: truncate and free inode.) 266.4794 Tj
0 -94.9336 Td
(3957     if\(ip->flags & I_BUSY\)) 135.4239 Tj
0 -104.427 Td
(3958       panic\("iput busy"\);) 131.0554 Tj
0 -113.9203 Td
(3959     ip->flags |= I_BUSY;) 126.6869 Tj
0 -123.4137 Td
(3960     release\(&icache.lock\);) 135.4239 Tj
0 -132.9071 Td
(3961     itrunc\(ip\);) 87.3703 Tj
0 -142.4004 Td
(3962     ip->type = 0;) 96.1073 Tj
0 -151.8938 Td
(3963     iupdate\(ip\);) 91.7388 Tj
0 -161.3871 Td
(3964     acquire\(&icache.lock\);) 135.4239 Tj
0 -170.8805 Td
(3965     ip->flags = 0;) 100.4758 Tj
0 -180.3739 Td
(3966     wakeup\(ip\);) 87.3703 Tj
0 -189.8672 Td
(3967   }) 34.9481 Tj
0 -199.3606 Td
(3968   ip->ref--;) 74.2647 Tj
0 -208.8539 Td
(3969   release\(&icache.lock\);) 126.6869 Tj
0 -218.3473 Td
(3970 }) 26.2111 Tj
0 -227.8407 Td
(3971 ) 21.8426 Tj
0 -237.334 Td
(3972 // Common idiom: unlock, then put.) 170.3721 Tj
0 -246.8274 Td
(3973 void) 39.3166 Tj
0 -256.3207 Td
(3974 iunlockput\(struct inode *ip\)) 144.161 Tj
0 -265.8141 Td
(3975 {) 26.2111 Tj
0 -275.3075 Td
(3976   iunlock\(ip\);) 83.0018 Tj
0 -284.8008 Td
(3977   iput\(ip\);) 69.8962 Tj
0 -294.2942 Td
(3978 }) 26.2111 Tj
0 -303.7875 Td
(3979 ) 21.8426 Tj
0 -313.2809 Td
(3980 ) 21.8426 Tj
0 -322.7743 Td
(3981 ) 21.8426 Tj
0 -332.2676 Td
(3982 ) 21.8426 Tj
0 -341.761 Td
(3983 ) 21.8426 Tj
0 -351.2543 Td
(3984 ) 21.8426 Tj
0 -360.7477 Td
(3985 ) 21.8426 Tj
0 -370.2411 Td
(3986 ) 21.8426 Tj
0 -379.7344 Td
(3987 ) 21.8426 Tj
0 -389.2278 Td
(3988 ) 21.8426 Tj
0 -398.7211 Td
(3989 ) 21.8426 Tj
0 -408.2145 Td
(3990 ) 21.8426 Tj
0 -417.7079 Td
(3991 ) 21.8426 Tj
0 -427.2012 Td
(3992 ) 21.8426 Tj
0 -436.6946 Td
(3993 ) 21.8426 Tj
0 -446.1879 Td
(3994 ) 21.8426 Tj
0 -455.6813 Td
(3995 ) 21.8426 Tj
0 -465.1747 Td
(3996 ) 21.8426 Tj
0 -474.668 Td
(3997 ) 21.8426 Tj
0 -484.1614 Td
(3998 ) 21.8426 Tj
0 -493.6547 Td
(3999 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 39) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 47 47
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/fs.c  Page 8) 152.898 Tj
0 -28.4801 Td
(4000 // Inode contents) 96.1073 Tj
0 -37.9735 Td
(4001 //) 30.5796 Tj
0 -47.4668 Td
(4002 // The contents \(data\) associated with each inode is sto\
red) 279.5849 Tj
0 -56.9602 Td
(4003 // in a sequence of blocks on the disk.  The first NDIRECT\
 blocks) 305.796 Tj
0 -66.4535 Td
(4004 // are listed in ip->addrs[].  The next NINDIRECT blocks a\
re) 283.9534 Tj
0 -75.9469 Td
(4005 // listed in the block ip->addrs[INDIRECT].) 209.6887 Tj
0 -85.4403 Td
(4006 ) 21.8426 Tj
0 -94.9336 Td
(4007 // Return the disk block address of the nth block in inode\
 ip.) 292.6905 Tj
0 -104.427 Td
(4008 // If there is no such block, bmap allocates one.) 235.8998 Tj
0 -113.9203 Td
(4009 static uint) 69.8962 Tj
0 -123.4137 Td
(4010 bmap\(struct inode *ip, uint bn\)) 157.2665 Tj
0 -132.9071 Td
(4011 {) 26.2111 Tj
0 -142.4004 Td
(4012   uint addr, *a;) 91.7388 Tj
0 -151.8938 Td
(4013   struct buf *bp;) 96.1073 Tj
0 -161.3871 Td
(4014 ) 21.8426 Tj
0 -170.8805 Td
(4015   if\(bn < NDIRECT\){) 104.8443 Tj
0 -180.3739 Td
(4016     if\(\(addr = ip->addrs[bn]\) == 0\)) 174.7406 Tj
0 -189.8672 Td
(4017       ip->addrs[bn] = addr = balloc\(ip->dev\);) 218.4257 Tj
0 -199.3606 Td
(4018     return addr;) 91.7388 Tj
0 -208.8539 Td
(4019   }) 34.9481 Tj
0 -218.3473 Td
(4020   bn -= NDIRECT;) 91.7388 Tj
0 -227.8407 Td
(4021 ) 21.8426 Tj
0 -237.334 Td
(4022   if\(bn < NINDIRECT\){) 113.5814 Tj
0 -246.8274 Td
(4023     // Load indirect block, allocating if necessary.) 249.0053 Tj
0 -256.3207 Td
(4024     if\(\(addr = ip->addrs[NDIRECT]\) == 0\)) 196.5831 Tj
0 -265.8141 Td
(4025       ip->addrs[NDIRECT] = addr = balloc\(ip->dev\);) 240.2683 Tj
0 -275.3075 Td
(4026     bp = bread\(ip->dev, addr\);) 152.898 Tj
0 -284.8008 Td
(4027     a = \(uint*\)bp->data;) 126.6869 Tj
0 -294.2942 Td
(4028     if\(\(addr = a[bn]\) == 0\){) 144.161 Tj
0 -303.7875 Td
(4029       a[bn] = addr = balloc\(ip->dev\);) 183.4776 Tj
0 -313.2809 Td
(4030       bwrite\(bp\);) 96.1073 Tj
0 -322.7743 Td
(4031     }) 43.6851 Tj
0 -332.2676 Td
(4032     brelse\(bp\);) 87.3703 Tj
0 -341.761 Td
(4033     return addr;) 91.7388 Tj
0 -351.2543 Td
(4034   }) 34.9481 Tj
0 -360.7477 Td
(4035 ) 21.8426 Tj
0 -370.2411 Td
(4036   panic\("bmap: out of range"\);) 152.898 Tj
0 -379.7344 Td
(4037 }) 26.2111 Tj
0 -389.2278 Td
(4038 ) 21.8426 Tj
0 -398.7211 Td
(4039 ) 21.8426 Tj
0 -408.2145 Td
(4040 ) 21.8426 Tj
0 -417.7079 Td
(4041 ) 21.8426 Tj
0 -427.2012 Td
(4042 ) 21.8426 Tj
0 -436.6946 Td
(4043 ) 21.8426 Tj
0 -446.1879 Td
(4044 ) 21.8426 Tj
0 -455.6813 Td
(4045 ) 21.8426 Tj
0 -465.1747 Td
(4046 ) 21.8426 Tj
0 -474.668 Td
(4047 ) 21.8426 Tj
0 -484.1614 Td
(4048 ) 21.8426 Tj
0 -493.6547 Td
(4049 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 40) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/fs.c  Page 9) 152.898 Tj
0 -28.4801 Td
(4050 // Truncate inode \(discard contents\).) 183.4776 Tj
0 -37.9735 Td
(4051 // Only called after the last dirent referring) 222.7942 Tj
0 -47.4668 Td
(4052 // to this inode has been erased on disk.) 200.9517 Tj
0 -56.9602 Td
(4053 static void) 69.8962 Tj
0 -66.4535 Td
(4054 itrunc\(struct inode *ip\)) 126.6869 Tj
0 -75.9469 Td
(4055 {) 26.2111 Tj
0 -85.4403 Td
(4056   int i, j;) 69.8962 Tj
0 -94.9336 Td
(4057   struct buf *bp;) 96.1073 Tj
0 -104.427 Td
(4058   uint *a;) 65.5277 Tj
0 -113.9203 Td
(4059 ) 21.8426 Tj
0 -123.4137 Td
(4060   for\(i = 0; i < NDIRECT; i++\){) 157.2665 Tj
0 -132.9071 Td
(4061     if\(ip->addrs[i]\){) 113.5814 Tj
0 -142.4004 Td
(4062       bfree\(ip->dev, ip->addrs[i]\);) 174.7406 Tj
0 -151.8938 Td
(4063       ip->addrs[i] = 0;) 122.3184 Tj
0 -161.3871 Td
(4064     }) 43.6851 Tj
0 -170.8805 Td
(4065   }) 34.9481 Tj
0 -180.3739 Td
(4066 ) 21.8426 Tj
0 -189.8672 Td
(4067   if\(ip->addrs[NDIRECT]\){) 131.0554 Tj
0 -199.3606 Td
(4068     bp = bread\(ip->dev, ip->addrs[NDIRECT]\);) 214.0572 Tj
0 -208.8539 Td
(4069     a = \(uint*\)bp->data;) 126.6869 Tj
0 -218.3473 Td
(4070     for\(j = 0; j < NINDIRECT; j++\){) 174.7406 Tj
0 -227.8407 Td
(4071       if\(a[j]\)) 83.0018 Tj
0 -237.334 Td
(4072         bfree\(ip->dev, a[j]\);) 148.5295 Tj
0 -246.8274 Td
(4073     }) 43.6851 Tj
0 -256.3207 Td
(4074     brelse\(bp\);) 87.3703 Tj
0 -265.8141 Td
(4075     bfree\(ip->dev, ip->addrs[NDIRECT]\);) 192.2146 Tj
0 -275.3075 Td
(4076     ip->addrs[NDIRECT] = 0;) 139.7925 Tj
0 -284.8008 Td
(4077   }) 34.9481 Tj
0 -294.2942 Td
(4078 ) 21.8426 Tj
0 -303.7875 Td
(4079   ip->size = 0;) 87.3703 Tj
0 -313.2809 Td
(4080   iupdate\(ip\);) 83.0018 Tj
0 -322.7743 Td
(4081 }) 26.2111 Tj
0 -332.2676 Td
(4082 ) 21.8426 Tj
0 -341.761 Td
(4083 // Copy stat information from inode.) 179.1091 Tj
0 -351.2543 Td
(4084 void) 39.3166 Tj
0 -360.7477 Td
(4085 stati\(struct inode *ip, struct stat *st\)) 196.5831 Tj
0 -370.2411 Td
(4086 {) 26.2111 Tj
0 -379.7344 Td
(4087   st->dev = ip->dev;) 109.2129 Tj
0 -389.2278 Td
(4088   st->ino = ip->inum;) 113.5814 Tj
0 -398.7211 Td
(4089   st->type = ip->type;) 117.9499 Tj
0 -408.2145 Td
(4090   st->nlink = ip->nlink;) 126.6869 Tj
0 -417.7079 Td
(4091   st->size = ip->size;) 117.9499 Tj
0 -427.2012 Td
(4092 }) 26.2111 Tj
0 -436.6946 Td
(4093 ) 21.8426 Tj
0 -446.1879 Td
(4094 ) 21.8426 Tj
0 -455.6813 Td
(4095 ) 21.8426 Tj
0 -465.1747 Td
(4096 ) 21.8426 Tj
0 -474.668 Td
(4097 ) 21.8426 Tj
0 -484.1614 Td
(4098 ) 21.8426 Tj
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(4099 ) 21.8426 Tj
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(Sheet 40) 34.9481 Tj
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(4100 // Read data from inode.) 126.6869 Tj
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(4101 int) 34.9481 Tj
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(4102 readi\(struct inode *ip, char *dst, uint off, uint n\)) 249.0053 Tj
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(4103 {) 26.2111 Tj
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(4104   uint tot, m;) 83.0018 Tj
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(4106 ) 21.8426 Tj
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(4107   if\(ip->type == T_DEV\){) 126.6869 Tj
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ajor].read\)) 318.9016 Tj
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(4109       return -1;) 91.7388 Tj
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(4110     return devsw[ip->major].read\(ip, dst, n\);) 218.4257 Tj
0 -132.9071 Td
(4111   }) 34.9481 Tj
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(4112 ) 21.8426 Tj
0 -151.8938 Td
(4113   if\(off > ip->size || off + n < off\)) 183.4776 Tj
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(4114     return -1;) 83.0018 Tj
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(4115   if\(off + n > ip->size\)) 126.6869 Tj
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(4116     n = ip->size - off;) 122.3184 Tj
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(4117 ) 21.8426 Tj
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(4118   for\(tot=0; tot<n; tot+=m, off+=m, dst+=m\){) 214.0572 Tj
0 -208.8539 Td
(4119     bp = bread\(ip->dev, bmap\(ip, off/BSIZE\)\);) 218.4257 Tj
0 -218.3473 Td
(4120     m = min\(n - tot, BSIZE - off%BSIZE\);) 196.5831 Tj
0 -227.8407 Td
(4121     memmove\(dst, bp->data + off%BSIZE, m\);) 205.3202 Tj
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(4122     brelse\(bp\);) 87.3703 Tj
0 -246.8274 Td
(4123   }) 34.9481 Tj
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(4124   return n;) 69.8962 Tj
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(4126 ) 21.8426 Tj
0 -284.8008 Td
(4127 ) 21.8426 Tj
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(4128 ) 21.8426 Tj
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(4129 ) 21.8426 Tj
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(4130 ) 21.8426 Tj
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(4131 ) 21.8426 Tj
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(4132 ) 21.8426 Tj
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(4133 ) 21.8426 Tj
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(4134 ) 21.8426 Tj
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(4135 ) 21.8426 Tj
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(4136 ) 21.8426 Tj
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(4137 ) 21.8426 Tj
0 -389.2278 Td
(4138 ) 21.8426 Tj
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(4139 ) 21.8426 Tj
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(4140 ) 21.8426 Tj
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(4141 ) 21.8426 Tj
0 -427.2012 Td
(4142 ) 21.8426 Tj
0 -436.6946 Td
(4143 ) 21.8426 Tj
0 -446.1879 Td
(4144 ) 21.8426 Tj
0 -455.6813 Td
(4145 ) 21.8426 Tj
0 -465.1747 Td
(4146 ) 21.8426 Tj
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(4147 ) 21.8426 Tj
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(4148 ) 21.8426 Tj
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(4149 ) 21.8426 Tj
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0 0 Td
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(Aug  8 01:04 2009  xv6/fs.c  Page 11) 157.2665 Tj
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(4150 // Write data to inode.) 122.3184 Tj
0 -37.9735 Td
(4151 int) 34.9481 Tj
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(4152 writei\(struct inode *ip, char *src, uint off, uint n\)) 253.3738 Tj
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(4153 {) 26.2111 Tj
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(4154   uint tot, m;) 83.0018 Tj
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(4155   struct buf *bp;) 96.1073 Tj
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(4156 ) 21.8426 Tj
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ajor].write\)) 323.2701 Tj
0 -113.9203 Td
(4159       return -1;) 91.7388 Tj
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(4160     return devsw[ip->major].write\(ip, src, n\);) 222.7942 Tj
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(4161   }) 34.9481 Tj
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(4162 ) 21.8426 Tj
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(4163   if\(off > ip->size || off + n < off\)) 183.4776 Tj
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(4164     return -1;) 83.0018 Tj
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(4165   if\(off + n > MAXFILE*BSIZE\)) 148.5295 Tj
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(4166     n = MAXFILE*BSIZE - off;) 144.161 Tj
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(4167 ) 21.8426 Tj
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(4168   for\(tot=0; tot<n; tot+=m, off+=m, src+=m\){) 214.0572 Tj
0 -208.8539 Td
(4169     bp = bread\(ip->dev, bmap\(ip, off/BSIZE\)\);) 218.4257 Tj
0 -218.3473 Td
(4170     m = min\(n - tot, BSIZE - off%BSIZE\);) 196.5831 Tj
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(4171     memmove\(bp->data + off%BSIZE, src, m\);) 205.3202 Tj
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(4172     bwrite\(bp\);) 87.3703 Tj
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(4173     brelse\(bp\);) 87.3703 Tj
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(4174   }) 34.9481 Tj
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(4176   if\(n > 0 && off > ip->size\){) 152.898 Tj
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(4177     ip->size = off;) 104.8443 Tj
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(4178     iupdate\(ip\);) 91.7388 Tj
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(4179   }) 34.9481 Tj
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(4180   return n;) 69.8962 Tj
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(4181 }) 26.2111 Tj
0 -332.2676 Td
(4182 ) 21.8426 Tj
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(4183 ) 21.8426 Tj
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(4184 ) 21.8426 Tj
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(4195 ) 21.8426 Tj
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(4196 ) 21.8426 Tj
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(4197 ) 21.8426 Tj
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(4198 ) 21.8426 Tj
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(4199 ) 21.8426 Tj
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(Sheet 41) 34.9481 Tj
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(Aug  8 01:04 2009  xv6/fs.c  Page 12) 157.2665 Tj
0 -28.4801 Td
(4200 // Directories) 83.0018 Tj
0 -37.9735 Td
(4201 ) 21.8426 Tj
0 -47.4668 Td
(4202 int) 34.9481 Tj
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(4204 {) 26.2111 Tj
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(4205   return strncmp\(s, t, DIRSIZ\);) 157.2665 Tj
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(4206 }) 26.2111 Tj
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(4207 ) 21.8426 Tj
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(4208 // Look for a directory entry in a directory.) 218.4257 Tj
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(4209 // If found, set *poff to byte offset of entry.) 227.1628 Tj
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(4210 // Caller must have already locked dp.) 187.8461 Tj
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(4211 struct inode*) 78.6333 Tj
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(4212 dirlookup\(struct inode *dp, char *name, uint *poff\)) 244.6368 Tj
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(4213 {) 26.2111 Tj
0 -161.3871 Td
(4214   uint off, inum;) 96.1073 Tj
0 -170.8805 Td
(4215   struct buf *bp;) 96.1073 Tj
0 -180.3739 Td
(4216   struct dirent *de;) 109.2129 Tj
0 -189.8672 Td
(4217 ) 21.8426 Tj
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(4218   if\(dp->type != T_DIR\)) 122.3184 Tj
0 -208.8539 Td
(4219     panic\("dirlookup not DIR"\);) 157.2665 Tj
0 -218.3473 Td
(4220 ) 21.8426 Tj
0 -227.8407 Td
(4221   for\(off = 0; off < dp->size; off += BSIZE\){) 218.4257 Tj
0 -237.334 Td
(4222     bp = bread\(dp->dev, bmap\(dp, off / BSIZE\)\);) 227.1628 Tj
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(4223     for\(de = \(struct dirent*\)bp->data;) 187.8461 Tj
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(4224         de < \(struct dirent*\)\(bp->data + BSIZE\);) 231.5313 Tj
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(4225         de++\){) 83.0018 Tj
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(4226       if\(de->inum == 0\)) 122.3184 Tj
0 -284.8008 Td
(4227         continue;) 96.1073 Tj
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(4228       if\(namecmp\(name, de->name\) == 0\){) 192.2146 Tj
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(4229         // entry matches path element) 183.4776 Tj
0 -313.2809 Td
(4230         if\(poff\)) 91.7388 Tj
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(4231           *poff = off + \(uchar*\)de - bp->data;) 222.7942 Tj
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(4232         inum = de->inum;) 126.6869 Tj
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(4233         brelse\(bp\);) 104.8443 Tj
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(4234         return iget\(dp->dev, inum\);) 174.7406 Tj
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(4235       }) 52.4222 Tj
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(4236     }) 43.6851 Tj
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(4237     brelse\(bp\);) 87.3703 Tj
0 -389.2278 Td
(4238   }) 34.9481 Tj
0 -398.7211 Td
(4239   return 0;) 69.8962 Tj
0 -408.2145 Td
(4240 }) 26.2111 Tj
0 -417.7079 Td
(4241 ) 21.8426 Tj
0 -427.2012 Td
(4242 ) 21.8426 Tj
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(4243 ) 21.8426 Tj
0 -446.1879 Td
(4244 ) 21.8426 Tj
0 -455.6813 Td
(4245 ) 21.8426 Tj
0 -465.1747 Td
(4246 ) 21.8426 Tj
0 -474.668 Td
(4247 ) 21.8426 Tj
0 -484.1614 Td
(4248 ) 21.8426 Tj
0 -493.6547 Td
(4249 ) 21.8426 Tj
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(Sheet 42) 34.9481 Tj
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(Aug  8 01:04 2009  xv6/fs.c  Page 13) 157.2665 Tj
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(4250 // Write a new directory entry \(name, inum\) into the dir\
ectory dp.) 310.1645 Tj
0 -37.9735 Td
(4251 int) 34.9481 Tj
0 -47.4668 Td
(4252 dirlink\(struct inode *dp, char *name, uint inum\)) 231.5313 Tj
0 -56.9602 Td
(4253 {) 26.2111 Tj
0 -66.4535 Td
(4254   int off;) 65.5277 Tj
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(4255   struct dirent de;) 104.8443 Tj
0 -85.4403 Td
(4256   struct inode *ip;) 104.8443 Tj
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(4257 ) 21.8426 Tj
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(4258   // Check that name is not present.) 179.1091 Tj
0 -113.9203 Td
(4259   if\(\(ip = dirlookup\(dp, name, 0\)\) != 0\){) 200.9517 Tj
0 -123.4137 Td
(4260     iput\(ip\);) 78.6333 Tj
0 -132.9071 Td
(4261     return -1;) 83.0018 Tj
0 -142.4004 Td
(4262   }) 34.9481 Tj
0 -151.8938 Td
(4263 ) 21.8426 Tj
0 -161.3871 Td
(4264   // Look for an empty dirent.) 152.898 Tj
0 -170.8805 Td
(4265   for\(off = 0; off < dp->size; off += sizeof\(de\)\){) 240.2683 Tj
0 -180.3739 Td
(4266     if\(readi\(dp, \(char*\)&de, off, sizeof\(de\)\) != si\
zeof\(de\)\)) 283.9534 Tj
0 -189.8672 Td
(4267       panic\("dirlink read"\);) 144.161 Tj
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(4268     if\(de.inum == 0\)) 109.2129 Tj
0 -208.8539 Td
(4269       break;) 74.2647 Tj
0 -218.3473 Td
(4270   }) 34.9481 Tj
0 -227.8407 Td
(4271 ) 21.8426 Tj
0 -237.334 Td
(4272   strncpy\(de.name, name, DIRSIZ\);) 166.0035 Tj
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(4273   de.inum = inum;) 96.1073 Tj
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(4274   if\(writei\(dp, \(char*\)&de, off, sizeof\(de\)\) != siz\
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(4275     panic\("dirlink"\);) 113.5814 Tj
0 -275.3075 Td
(4276 ) 21.8426 Tj
0 -284.8008 Td
(4277   return 0;) 69.8962 Tj
0 -294.2942 Td
(4278 }) 26.2111 Tj
0 -303.7875 Td
(4279 ) 21.8426 Tj
0 -313.2809 Td
(4280 ) 21.8426 Tj
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(4281 ) 21.8426 Tj
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(4285 ) 21.8426 Tj
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(4288 ) 21.8426 Tj
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(4289 ) 21.8426 Tj
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(4290 ) 21.8426 Tj
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(4291 ) 21.8426 Tj
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(4292 ) 21.8426 Tj
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(4295 ) 21.8426 Tj
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(4296 ) 21.8426 Tj
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(4297 ) 21.8426 Tj
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(4299 ) 21.8426 Tj
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(Sheet 42) 34.9481 Tj
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0 0 612 792 re W
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(Aug  8 01:04 2009  xv6/fs.c  Page 14) 157.2665 Tj
0 -28.4801 Td
(4300 // Paths) 56.7907 Tj
0 -37.9735 Td
(4301 ) 21.8426 Tj
0 -47.4668 Td
(4302 // Copy the next path element from path into name.) 240.2683 Tj
0 -56.9602 Td
(4303 // Return a pointer to the element following the copied on\
e.) 283.9534 Tj
0 -66.4535 Td
(4304 // The returned path has no leading slashes,) 214.0572 Tj
0 -75.9469 Td
(4305 // so the caller can check *path=='\\0' to see if the name\
 is the last one.) 345.1126 Tj
0 -85.4403 Td
(4306 // If no name to remove, return 0.) 170.3721 Tj
0 -94.9336 Td
(4307 //) 30.5796 Tj
0 -104.427 Td
(4308 // Examples:) 74.2647 Tj
0 -113.9203 Td
(4309 //   skipelem\("a/bb/c", name\) = "bb/c", setting name = "\
a") 275.2164 Tj
0 -123.4137 Td
(4310 //   skipelem\("///a//bb", name\) = "bb", setting name = "\
a") 275.2164 Tj
0 -132.9071 Td
(4311 //   skipelem\("a", name\) = "", setting name = "a") 235.8998 Tj
0 -142.4004 Td
(4312 //   skipelem\("", name\) = skipelem\("////", name\) = 0) 249.0053 Tj
0 -151.8938 Td
(4313 //) 30.5796 Tj
0 -161.3871 Td
(4314 static char*) 74.2647 Tj
0 -170.8805 Td
(4315 skipelem\(char *path, char *name\)) 161.635 Tj
0 -180.3739 Td
(4316 {) 26.2111 Tj
0 -189.8672 Td
(4317   char *s;) 65.5277 Tj
0 -199.3606 Td
(4318   int len;) 65.5277 Tj
0 -208.8539 Td
(4319 ) 21.8426 Tj
0 -218.3473 Td
(4320   while\(*path == '/'\)) 113.5814 Tj
0 -227.8407 Td
(4321     path++;) 69.8962 Tj
0 -237.334 Td
(4322   if\(*path == 0\)) 91.7388 Tj
0 -246.8274 Td
(4323     return 0;) 78.6333 Tj
0 -256.3207 Td
(4324   s = path;) 69.8962 Tj
0 -265.8141 Td
(4325   while\(*path != '/' && *path != 0\)) 174.7406 Tj
0 -275.3075 Td
(4326     path++;) 69.8962 Tj
0 -284.8008 Td
(4327   len = path - s;) 96.1073 Tj
0 -294.2942 Td
(4328   if\(len >= DIRSIZ\)) 104.8443 Tj
0 -303.7875 Td
(4329     memmove\(name, s, DIRSIZ\);) 148.5295 Tj
0 -313.2809 Td
(4330   else {) 56.7907 Tj
0 -322.7743 Td
(4331     memmove\(name, s, len\);) 135.4239 Tj
0 -332.2676 Td
(4332     name[len] = 0;) 100.4758 Tj
0 -341.761 Td
(4333   }) 34.9481 Tj
0 -351.2543 Td
(4334   while\(*path == '/'\)) 113.5814 Tj
0 -360.7477 Td
(4335     path++;) 69.8962 Tj
0 -370.2411 Td
(4336   return path;) 83.0018 Tj
0 -379.7344 Td
(4337 }) 26.2111 Tj
0 -389.2278 Td
(4338 ) 21.8426 Tj
0 -398.7211 Td
(4339 ) 21.8426 Tj
0 -408.2145 Td
(4340 ) 21.8426 Tj
0 -417.7079 Td
(4341 ) 21.8426 Tj
0 -427.2012 Td
(4342 ) 21.8426 Tj
0 -436.6946 Td
(4343 ) 21.8426 Tj
0 -446.1879 Td
(4344 ) 21.8426 Tj
0 -455.6813 Td
(4345 ) 21.8426 Tj
0 -465.1747 Td
(4346 ) 21.8426 Tj
0 -474.668 Td
(4347 ) 21.8426 Tj
0 -484.1614 Td
(4348 ) 21.8426 Tj
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(4349 ) 21.8426 Tj
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(Sheet 43) 34.9481 Tj
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[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/fs.c  Page 15) 157.2665 Tj
0 -28.4801 Td
(4350 // Look up and return the inode for a path name.) 231.5313 Tj
0 -37.9735 Td
(4351 // If parent != 0, return the inode for the parent and cop\
y the final) 323.2701 Tj
0 -47.4668 Td
(4352 // path element into name, which must have room for DIRSIZ\
 bytes.) 305.796 Tj
0 -56.9602 Td
(4353 static struct inode*) 109.2129 Tj
0 -66.4535 Td
(4354 namex\(char *path, int nameiparent, char *name\)) 222.7942 Tj
0 -75.9469 Td
(4355 {) 26.2111 Tj
0 -85.4403 Td
(4356   struct inode *ip, *next;) 135.4239 Tj
0 -94.9336 Td
(4357 ) 21.8426 Tj
0 -104.427 Td
(4358   if\(*path == '/'\)) 100.4758 Tj
0 -113.9203 Td
(4359     ip = iget\(ROOTDEV, ROOTINO\);) 161.635 Tj
0 -123.4137 Td
(4360   else) 48.0537 Tj
0 -132.9071 Td
(4361     ip = idup\(cp->cwd\);) 122.3184 Tj
0 -142.4004 Td
(4362 ) 21.8426 Tj
0 -151.8938 Td
(4363   while\(\(path = skipelem\(path, name\)\) != 0\){) 214.0572 Tj
0 -161.3871 Td
(4364     ilock\(ip\);) 83.0018 Tj
0 -170.8805 Td
(4365     if\(ip->type != T_DIR\){) 135.4239 Tj
0 -180.3739 Td
(4366       iunlockput\(ip\);) 113.5814 Tj
0 -189.8672 Td
(4367       return 0;) 87.3703 Tj
0 -199.3606 Td
(4368     }) 43.6851 Tj
0 -208.8539 Td
(4369     if\(nameiparent && *path == '\\0'\){) 183.4776 Tj
0 -218.3473 Td
(4370       // Stop one level early.) 152.898 Tj
0 -227.8407 Td
(4371       iunlock\(ip\);) 100.4758 Tj
0 -237.334 Td
(4372       return ip;) 91.7388 Tj
0 -246.8274 Td
(4373     }) 43.6851 Tj
0 -256.3207 Td
(4374     if\(\(next = dirlookup\(ip, name, 0\)\) == 0\){) 218.4257 Tj
0 -265.8141 Td
(4375       iunlockput\(ip\);) 113.5814 Tj
0 -275.3075 Td
(4376       return 0;) 87.3703 Tj
0 -284.8008 Td
(4377     }) 43.6851 Tj
0 -294.2942 Td
(4378     iunlockput\(ip\);) 104.8443 Tj
0 -303.7875 Td
(4379     ip = next;) 83.0018 Tj
0 -313.2809 Td
(4380   }) 34.9481 Tj
0 -322.7743 Td
(4381   if\(nameiparent\){) 100.4758 Tj
0 -332.2676 Td
(4382     iput\(ip\);) 78.6333 Tj
0 -341.761 Td
(4383     return 0;) 78.6333 Tj
0 -351.2543 Td
(4384   }) 34.9481 Tj
0 -360.7477 Td
(4385   return ip;) 74.2647 Tj
0 -370.2411 Td
(4386 }) 26.2111 Tj
0 -379.7344 Td
(4387 ) 21.8426 Tj
0 -389.2278 Td
(4388 struct inode*) 78.6333 Tj
0 -398.7211 Td
(4389 namei\(char *path\)) 96.1073 Tj
0 -408.2145 Td
(4390 {) 26.2111 Tj
0 -417.7079 Td
(4391   char name[DIRSIZ];) 109.2129 Tj
0 -427.2012 Td
(4392   return namex\(path, 0, name\);) 152.898 Tj
0 -436.6946 Td
(4393 }) 26.2111 Tj
0 -446.1879 Td
(4394 ) 21.8426 Tj
0 -455.6813 Td
(4395 struct inode*) 78.6333 Tj
0 -465.1747 Td
(4396 nameiparent\(char *path, char *name\)) 174.7406 Tj
0 -474.668 Td
(4397 {) 26.2111 Tj
0 -484.1614 Td
(4398   return namex\(path, 1, name\);) 152.898 Tj
0 -493.6547 Td
(4399 }) 26.2111 Tj
0 -522.1348 Td
(Sheet 43) 34.9481 Tj
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(4400 #include "types.h") 100.4758 Tj
0 -37.9735 Td
(4401 #include "defs.h") 96.1073 Tj
0 -47.4668 Td
(4402 #include "param.h") 100.4758 Tj
0 -56.9602 Td
(4403 #include "file.h") 96.1073 Tj
0 -66.4535 Td
(4404 #include "spinlock.h") 113.5814 Tj
0 -75.9469 Td
(4405 ) 21.8426 Tj
0 -85.4403 Td
(4406 struct devsw devsw[NDEV];) 131.0554 Tj
0 -94.9336 Td
(4407 struct {) 56.7907 Tj
0 -104.427 Td
(4408   struct spinlock lock;) 122.3184 Tj
0 -113.9203 Td
(4409   struct file file[NFILE];) 135.4239 Tj
0 -123.4137 Td
(4410 } ftable;) 61.1592 Tj
0 -132.9071 Td
(4411 ) 21.8426 Tj
0 -142.4004 Td
(4412 void) 39.3166 Tj
0 -151.8938 Td
(4413 fileinit\(void\)) 83.0018 Tj
0 -161.3871 Td
(4414 {) 26.2111 Tj
0 -170.8805 Td
(4415   initlock\(&ftable.lock, "ftable"\);) 174.7406 Tj
0 -180.3739 Td
(4416 }) 26.2111 Tj
0 -189.8672 Td
(4417 ) 21.8426 Tj
0 -199.3606 Td
(4418 // Allocate a file structure.) 148.5295 Tj
0 -208.8539 Td
(4419 struct file*) 74.2647 Tj
0 -218.3473 Td
(4420 filealloc\(void\)) 87.3703 Tj
0 -227.8407 Td
(4421 {) 26.2111 Tj
0 -237.334 Td
(4422   struct file *f;) 96.1073 Tj
0 -246.8274 Td
(4423 ) 21.8426 Tj
0 -256.3207 Td
(4424   acquire\(&ftable.lock\);) 126.6869 Tj
0 -265.8141 Td
(4425   for\(f = ftable.file; f < ftable.file + NFILE; f++\){) 253.3738 Tj
0 -275.3075 Td
(4426     if\(f->ref == 0\){) 109.2129 Tj
0 -284.8008 Td
(4427       f->ref = 1;) 96.1073 Tj
0 -294.2942 Td
(4428       release\(&ftable.lock\);) 144.161 Tj
0 -303.7875 Td
(4429       return f;) 87.3703 Tj
0 -313.2809 Td
(4430     }) 43.6851 Tj
0 -322.7743 Td
(4431   }) 34.9481 Tj
0 -332.2676 Td
(4432   release\(&ftable.lock\);) 126.6869 Tj
0 -341.761 Td
(4433   return 0;) 69.8962 Tj
0 -351.2543 Td
(4434 }) 26.2111 Tj
0 -360.7477 Td
(4435 ) 21.8426 Tj
0 -370.2411 Td
(4436 // Increment ref count for file f.) 170.3721 Tj
0 -379.7344 Td
(4437 struct file*) 74.2647 Tj
0 -389.2278 Td
(4438 filedup\(struct file *f\)) 122.3184 Tj
0 -398.7211 Td
(4439 {) 26.2111 Tj
0 -408.2145 Td
(4440   acquire\(&ftable.lock\);) 126.6869 Tj
0 -417.7079 Td
(4441   if\(f->ref < 1\)) 91.7388 Tj
0 -427.2012 Td
(4442     panic\("filedup"\);) 113.5814 Tj
0 -436.6946 Td
(4443   f->ref++;) 69.8962 Tj
0 -446.1879 Td
(4444   release\(&ftable.lock\);) 126.6869 Tj
0 -455.6813 Td
(4445   return f;) 69.8962 Tj
0 -465.1747 Td
(4446 }) 26.2111 Tj
0 -474.668 Td
(4447 ) 21.8426 Tj
0 -484.1614 Td
(4448 ) 21.8426 Tj
0 -493.6547 Td
(4449 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 44) 34.9481 Tj
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[1 0 0 1 0 0] Tm
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[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/file.c  Page 2) 161.635 Tj
0 -28.4801 Td
(4450 // Close file f.  \(Decrement ref count, close when reache\
s 0.\)) 292.6905 Tj
0 -37.9735 Td
(4451 void) 39.3166 Tj
0 -47.4668 Td
(4452 fileclose\(struct file *f\)) 131.0554 Tj
0 -56.9602 Td
(4453 {) 26.2111 Tj
0 -66.4535 Td
(4454   struct file ff;) 96.1073 Tj
0 -75.9469 Td
(4455 ) 21.8426 Tj
0 -85.4403 Td
(4456   acquire\(&ftable.lock\);) 126.6869 Tj
0 -94.9336 Td
(4457   if\(f->ref < 1\)) 91.7388 Tj
0 -104.427 Td
(4458     panic\("fileclose"\);) 122.3184 Tj
0 -113.9203 Td
(4459   if\(--f->ref > 0\){) 104.8443 Tj
0 -123.4137 Td
(4460     release\(&ftable.lock\);) 135.4239 Tj
0 -132.9071 Td
(4461     return;) 69.8962 Tj
0 -142.4004 Td
(4462   }) 34.9481 Tj
0 -151.8938 Td
(4463   ff = *f;) 65.5277 Tj
0 -161.3871 Td
(4464   f->ref = 0;) 78.6333 Tj
0 -170.8805 Td
(4465   f->type = FD_NONE;) 109.2129 Tj
0 -180.3739 Td
(4466   release\(&ftable.lock\);) 126.6869 Tj
0 -189.8672 Td
(4467 ) 21.8426 Tj
0 -199.3606 Td
(4468   if\(ff.type == FD_PIPE\)) 126.6869 Tj
0 -208.8539 Td
(4469     pipeclose\(ff.pipe, ff.writable\);) 179.1091 Tj
0 -218.3473 Td
(4470   else if\(ff.type == FD_INODE\)) 152.898 Tj
0 -227.8407 Td
(4471     iput\(ff.ip\);) 91.7388 Tj
0 -237.334 Td
(4472 }) 26.2111 Tj
0 -246.8274 Td
(4473 ) 21.8426 Tj
0 -256.3207 Td
(4474 // Get metadata about file f.) 148.5295 Tj
0 -265.8141 Td
(4475 int) 34.9481 Tj
0 -275.3075 Td
(4476 filestat\(struct file *f, struct stat *st\)) 200.9517 Tj
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(4477 {) 26.2111 Tj
0 -294.2942 Td
(4478   if\(f->type == FD_INODE\){) 135.4239 Tj
0 -303.7875 Td
(4479     ilock\(f->ip\);) 96.1073 Tj
0 -313.2809 Td
(4480     stati\(f->ip, st\);) 113.5814 Tj
0 -322.7743 Td
(4481     iunlock\(f->ip\);) 104.8443 Tj
0 -332.2676 Td
(4482     return 0;) 78.6333 Tj
0 -341.761 Td
(4483   }) 34.9481 Tj
0 -351.2543 Td
(4484   return -1;) 74.2647 Tj
0 -360.7477 Td
(4485 }) 26.2111 Tj
0 -370.2411 Td
(4486 ) 21.8426 Tj
0 -379.7344 Td
(4487 ) 21.8426 Tj
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(4488 ) 21.8426 Tj
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(4491 ) 21.8426 Tj
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(4492 ) 21.8426 Tj
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(4493 ) 21.8426 Tj
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(4494 ) 21.8426 Tj
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(4496 ) 21.8426 Tj
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(4499 ) 21.8426 Tj
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(4500 // Read from file f.  Addr is kernel address.) 218.4257 Tj
0 -37.9735 Td
(4501 int) 34.9481 Tj
0 -47.4668 Td
(4502 fileread\(struct file *f, char *addr, int n\)) 209.6887 Tj
0 -56.9602 Td
(4503 {) 26.2111 Tj
0 -66.4535 Td
(4504   int r;) 56.7907 Tj
0 -75.9469 Td
(4505 ) 21.8426 Tj
0 -85.4403 Td
(4506   if\(f->readable == 0\)) 117.9499 Tj
0 -94.9336 Td
(4507     return -1;) 83.0018 Tj
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(4508   if\(f->type == FD_PIPE\)) 126.6869 Tj
0 -113.9203 Td
(4509     return piperead\(f->pipe, addr, n\);) 187.8461 Tj
0 -123.4137 Td
(4510   if\(f->type == FD_INODE\){) 135.4239 Tj
0 -132.9071 Td
(4511     ilock\(f->ip\);) 96.1073 Tj
0 -142.4004 Td
(4512     if\(\(r = readi\(f->ip, addr, f->off, n\)\) > 0\)) 227.1628 Tj
0 -151.8938 Td
(4513       f->off += r;) 100.4758 Tj
0 -161.3871 Td
(4514     iunlock\(f->ip\);) 104.8443 Tj
0 -170.8805 Td
(4515     return r;) 78.6333 Tj
0 -180.3739 Td
(4516   }) 34.9481 Tj
0 -189.8672 Td
(4517   panic\("fileread"\);) 109.2129 Tj
0 -199.3606 Td
(4518 }) 26.2111 Tj
0 -208.8539 Td
(4519 ) 21.8426 Tj
0 -218.3473 Td
(4520 // Write to file f.  Addr is kernel address.) 214.0572 Tj
0 -227.8407 Td
(4521 int) 34.9481 Tj
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(4522 filewrite\(struct file *f, char *addr, int n\)) 214.0572 Tj
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(4523 {) 26.2111 Tj
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(4524   int r;) 56.7907 Tj
0 -265.8141 Td
(4525 ) 21.8426 Tj
0 -275.3075 Td
(4526   if\(f->writable == 0\)) 117.9499 Tj
0 -284.8008 Td
(4527     return -1;) 83.0018 Tj
0 -294.2942 Td
(4528   if\(f->type == FD_PIPE\)) 126.6869 Tj
0 -303.7875 Td
(4529     return pipewrite\(f->pipe, addr, n\);) 192.2146 Tj
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(4530   if\(f->type == FD_INODE\){) 135.4239 Tj
0 -322.7743 Td
(4531     ilock\(f->ip\);) 96.1073 Tj
0 -332.2676 Td
(4532     if\(\(r = writei\(f->ip, addr, f->off, n\)\) > 0\)) 231.5313 Tj
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(4533       f->off += r;) 100.4758 Tj
0 -351.2543 Td
(4534     iunlock\(f->ip\);) 104.8443 Tj
0 -360.7477 Td
(4535     return r;) 78.6333 Tj
0 -370.2411 Td
(4536   }) 34.9481 Tj
0 -379.7344 Td
(4537   panic\("filewrite"\);) 113.5814 Tj
0 -389.2278 Td
(4538 }) 26.2111 Tj
0 -398.7211 Td
(4539 ) 21.8426 Tj
0 -408.2145 Td
(4540 ) 21.8426 Tj
0 -417.7079 Td
(4541 ) 21.8426 Tj
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(4545 ) 21.8426 Tj
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(4546 ) 21.8426 Tj
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(4547 ) 21.8426 Tj
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(Aug  8 01:04 2009  xv6/sysfile.c  Page 1) 174.7406 Tj
0 -28.4801 Td
(4550 #include "types.h") 100.4758 Tj
0 -37.9735 Td
(4551 #include "defs.h") 96.1073 Tj
0 -47.4668 Td
(4552 #include "param.h") 100.4758 Tj
0 -56.9602 Td
(4553 #include "stat.h") 96.1073 Tj
0 -66.4535 Td
(4554 #include "mmu.h") 91.7388 Tj
0 -75.9469 Td
(4555 #include "proc.h") 96.1073 Tj
0 -85.4403 Td
(4556 #include "fs.h") 87.3703 Tj
0 -94.9336 Td
(4557 #include "file.h") 96.1073 Tj
0 -104.427 Td
(4558 #include "fcntl.h") 100.4758 Tj
0 -113.9203 Td
(4559 ) 21.8426 Tj
0 -123.4137 Td
(4560 // Fetch the nth word-sized system call argument as a file\
 descriptor) 323.2701 Tj
0 -132.9071 Td
(4561 // and return both the descriptor and the corresponding st\
ruct file.) 318.9016 Tj
0 -142.4004 Td
(4562 static int) 65.5277 Tj
0 -151.8938 Td
(4563 argfd\(int n, int *pfd, struct file **pf\)) 196.5831 Tj
0 -161.3871 Td
(4564 {) 26.2111 Tj
0 -170.8805 Td
(4565   int fd;) 61.1592 Tj
0 -180.3739 Td
(4566   struct file *f;) 96.1073 Tj
0 -189.8672 Td
(4567 ) 21.8426 Tj
0 -199.3606 Td
(4568   if\(argint\(n, &fd\) < 0\)) 126.6869 Tj
0 -208.8539 Td
(4569     return -1;) 83.0018 Tj
0 -218.3473 Td
(4570   if\(fd < 0 || fd >= NOFILE || \(f=cp->ofile[fd]\) == 0\)) 257.7424 Tj
0 -227.8407 Td
(4571     return -1;) 83.0018 Tj
0 -237.334 Td
(4572   if\(pfd\)) 61.1592 Tj
0 -246.8274 Td
(4573     *pfd = fd;) 83.0018 Tj
0 -256.3207 Td
(4574   if\(pf\)) 56.7907 Tj
0 -265.8141 Td
(4575     *pf = f;) 74.2647 Tj
0 -275.3075 Td
(4576   return 0;) 69.8962 Tj
0 -284.8008 Td
(4577 }) 26.2111 Tj
0 -294.2942 Td
(4578 ) 21.8426 Tj
0 -303.7875 Td
(4579 // Allocate a file descriptor for the given file.) 235.8998 Tj
0 -313.2809 Td
(4580 // Takes over file reference from caller on success.) 249.0053 Tj
0 -322.7743 Td
(4581 static int) 65.5277 Tj
0 -332.2676 Td
(4582 fdalloc\(struct file *f\)) 122.3184 Tj
0 -341.761 Td
(4583 {) 26.2111 Tj
0 -351.2543 Td
(4584   int fd;) 61.1592 Tj
0 -360.7477 Td
(4585 ) 21.8426 Tj
0 -370.2411 Td
(4586   for\(fd = 0; fd < NOFILE; fd++\){) 166.0035 Tj
0 -379.7344 Td
(4587     if\(cp->ofile[fd] == 0\){) 139.7925 Tj
0 -389.2278 Td
(4588       cp->ofile[fd] = f;) 126.6869 Tj
0 -398.7211 Td
(4589       return fd;) 91.7388 Tj
0 -408.2145 Td
(4590     }) 43.6851 Tj
0 -417.7079 Td
(4591   }) 34.9481 Tj
0 -427.2012 Td
(4592   return -1;) 74.2647 Tj
0 -436.6946 Td
(4593 }) 26.2111 Tj
0 -446.1879 Td
(4594 ) 21.8426 Tj
0 -455.6813 Td
(4595 ) 21.8426 Tj
0 -465.1747 Td
(4596 ) 21.8426 Tj
0 -474.668 Td
(4597 ) 21.8426 Tj
0 -484.1614 Td
(4598 ) 21.8426 Tj
0 -493.6547 Td
(4599 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 45) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 53 53
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/sysfile.c  Page 2) 174.7406 Tj
0 -28.4801 Td
(4600 int) 34.9481 Tj
0 -37.9735 Td
(4601 sys_dup\(void\)) 78.6333 Tj
0 -47.4668 Td
(4602 {) 26.2111 Tj
0 -56.9602 Td
(4603   struct file *f;) 96.1073 Tj
0 -66.4535 Td
(4604   int fd;) 61.1592 Tj
0 -75.9469 Td
(4605 ) 21.8426 Tj
0 -85.4403 Td
(4606   if\(argfd\(0, 0, &f\) < 0\)) 131.0554 Tj
0 -94.9336 Td
(4607     return -1;) 83.0018 Tj
0 -104.427 Td
(4608   if\(\(fd=fdalloc\(f\)\) < 0\)) 131.0554 Tj
0 -113.9203 Td
(4609     return -1;) 83.0018 Tj
0 -123.4137 Td
(4610   filedup\(f\);) 78.6333 Tj
0 -132.9071 Td
(4611   return fd;) 74.2647 Tj
0 -142.4004 Td
(4612 }) 26.2111 Tj
0 -151.8938 Td
(4613 ) 21.8426 Tj
0 -161.3871 Td
(4614 int) 34.9481 Tj
0 -170.8805 Td
(4615 sys_read\(void\)) 83.0018 Tj
0 -180.3739 Td
(4616 {) 26.2111 Tj
0 -189.8672 Td
(4617   struct file *f;) 96.1073 Tj
0 -199.3606 Td
(4618   int n;) 56.7907 Tj
0 -208.8539 Td
(4619   char *p;) 65.5277 Tj
0 -218.3473 Td
(4620 ) 21.8426 Tj
0 -227.8407 Td
(4621   if\(argfd\(0, 0, &f\) < 0 || argint\(2, &n\) < 0 || argp\
tr\(1, &p, n\) < 0\)) 327.6386 Tj
0 -237.334 Td
(4622     return -1;) 83.0018 Tj
0 -246.8274 Td
(4623   return fileread\(f, p, n\);) 139.7925 Tj
0 -256.3207 Td
(4624 }) 26.2111 Tj
0 -265.8141 Td
(4625 ) 21.8426 Tj
0 -275.3075 Td
(4626 int) 34.9481 Tj
0 -284.8008 Td
(4627 sys_write\(void\)) 87.3703 Tj
0 -294.2942 Td
(4628 {) 26.2111 Tj
0 -303.7875 Td
(4629   struct file *f;) 96.1073 Tj
0 -313.2809 Td
(4630   int n;) 56.7907 Tj
0 -322.7743 Td
(4631   char *p;) 65.5277 Tj
0 -332.2676 Td
(4632 ) 21.8426 Tj
0 -341.761 Td
(4633   if\(argfd\(0, 0, &f\) < 0 || argint\(2, &n\) < 0 || argp\
tr\(1, &p, n\) < 0\)) 327.6386 Tj
0 -351.2543 Td
(4634     return -1;) 83.0018 Tj
0 -360.7477 Td
(4635   return filewrite\(f, p, n\);) 144.161 Tj
0 -370.2411 Td
(4636 }) 26.2111 Tj
0 -379.7344 Td
(4637 ) 21.8426 Tj
0 -389.2278 Td
(4638 int) 34.9481 Tj
0 -398.7211 Td
(4639 sys_close\(void\)) 87.3703 Tj
0 -408.2145 Td
(4640 {) 26.2111 Tj
0 -417.7079 Td
(4641   int fd;) 61.1592 Tj
0 -427.2012 Td
(4642   struct file *f;) 96.1073 Tj
0 -436.6946 Td
(4643 ) 21.8426 Tj
0 -446.1879 Td
(4644   if\(argfd\(0, &fd, &f\) < 0\)) 139.7925 Tj
0 -455.6813 Td
(4645     return -1;) 83.0018 Tj
0 -465.1747 Td
(4646   cp->ofile[fd] = 0;) 109.2129 Tj
0 -474.668 Td
(4647   fileclose\(f\);) 87.3703 Tj
0 -484.1614 Td
(4648   return 0;) 69.8962 Tj
0 -493.6547 Td
(4649 }) 26.2111 Tj
0 -522.1348 Td
(Sheet 46) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/sysfile.c  Page 3) 174.7406 Tj
0 -28.4801 Td
(4650 int) 34.9481 Tj
0 -37.9735 Td
(4651 sys_fstat\(void\)) 87.3703 Tj
0 -47.4668 Td
(4652 {) 26.2111 Tj
0 -56.9602 Td
(4653   struct file *f;) 96.1073 Tj
0 -66.4535 Td
(4654   struct stat *st;) 100.4758 Tj
0 -75.9469 Td
(4655 ) 21.8426 Tj
0 -85.4403 Td
(4656   if\(argfd\(0, 0, &f\) < 0 || argptr\(1, \(void*\)&st, si\
zeof\(*st\)\) < 0\)) 314.533 Tj
0 -94.9336 Td
(4657     return -1;) 83.0018 Tj
0 -104.427 Td
(4658   return filestat\(f, st\);) 131.0554 Tj
0 -113.9203 Td
(4659 }) 26.2111 Tj
0 -123.4137 Td
(4660 ) 21.8426 Tj
0 -132.9071 Td
(4661 // Create the path new as a link to the same inode as old.) 275.2164 Tj
0 -142.4004 Td
(4662 int) 34.9481 Tj
0 -151.8938 Td
(4663 sys_link\(void\)) 83.0018 Tj
0 -161.3871 Td
(4664 {) 26.2111 Tj
0 -170.8805 Td
(4665   char name[DIRSIZ], *new, *old;) 161.635 Tj
0 -180.3739 Td
(4666   struct inode *dp, *ip;) 126.6869 Tj
0 -189.8672 Td
(4667 ) 21.8426 Tj
0 -199.3606 Td
(4668   if\(argstr\(0, &old\) < 0 || argstr\(1, &new\) < 0\)) 231.5313 Tj
0 -208.8539 Td
(4669     return -1;) 83.0018 Tj
0 -218.3473 Td
(4670   if\(\(ip = namei\(old\)\) == 0\)) 144.161 Tj
0 -227.8407 Td
(4671     return -1;) 83.0018 Tj
0 -237.334 Td
(4672   ilock\(ip\);) 74.2647 Tj
0 -246.8274 Td
(4673   if\(ip->type == T_DIR\){) 126.6869 Tj
0 -256.3207 Td
(4674     iunlockput\(ip\);) 104.8443 Tj
0 -265.8141 Td
(4675     return -1;) 83.0018 Tj
0 -275.3075 Td
(4676   }) 34.9481 Tj
0 -284.8008 Td
(4677   ip->nlink++;) 83.0018 Tj
0 -294.2942 Td
(4678   iupdate\(ip\);) 83.0018 Tj
0 -303.7875 Td
(4679   iunlock\(ip\);) 83.0018 Tj
0 -313.2809 Td
(4680 ) 21.8426 Tj
0 -322.7743 Td
(4681   if\(\(dp = nameiparent\(new, name\)\) == 0\)) 196.5831 Tj
0 -332.2676 Td
(4682     goto bad;) 78.6333 Tj
0 -341.761 Td
(4683   ilock\(dp\);) 74.2647 Tj
0 -351.2543 Td
(4684   if\(dp->dev != ip->dev || dirlink\(dp, name, ip->inum\) \
< 0\){) 283.9534 Tj
0 -360.7477 Td
(4685     iunlockput\(dp\);) 104.8443 Tj
0 -370.2411 Td
(4686     goto bad;) 78.6333 Tj
0 -379.7344 Td
(4687   }) 34.9481 Tj
0 -389.2278 Td
(4688   iunlockput\(dp\);) 96.1073 Tj
0 -398.7211 Td
(4689   iput\(ip\);) 69.8962 Tj
0 -408.2145 Td
(4690   return 0;) 69.8962 Tj
0 -417.7079 Td
(4691 ) 21.8426 Tj
0 -427.2012 Td
(4692 bad:) 39.3166 Tj
0 -436.6946 Td
(4693   ilock\(ip\);) 74.2647 Tj
0 -446.1879 Td
(4694   ip->nlink--;) 83.0018 Tj
0 -455.6813 Td
(4695   iupdate\(ip\);) 83.0018 Tj
0 -465.1747 Td
(4696   iunlockput\(ip\);) 96.1073 Tj
0 -474.668 Td
(4697   return -1;) 74.2647 Tj
0 -484.1614 Td
(4698 }) 26.2111 Tj
0 -493.6547 Td
(4699 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 46) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 54 54
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/sysfile.c  Page 4) 174.7406 Tj
0 -28.4801 Td
(4700 // Is the directory dp empty except for "." and ".." ?) 257.7424 Tj
0 -37.9735 Td
(4701 static int) 65.5277 Tj
0 -47.4668 Td
(4702 isdirempty\(struct inode *dp\)) 144.161 Tj
0 -56.9602 Td
(4703 {) 26.2111 Tj
0 -66.4535 Td
(4704   int off;) 65.5277 Tj
0 -75.9469 Td
(4705   struct dirent de;) 104.8443 Tj
0 -85.4403 Td
(4706 ) 21.8426 Tj
0 -94.9336 Td
(4707   for\(off=2*sizeof\(de\); off<dp->size; off+=sizeof\(de\)\
\){) 262.1109 Tj
0 -104.427 Td
(4708     if\(readi\(dp, \(char*\)&de, off, sizeof\(de\)\) != si\
zeof\(de\)\)) 283.9534 Tj
0 -113.9203 Td
(4709       panic\("isdirempty: readi"\);) 166.0035 Tj
0 -123.4137 Td
(4710     if\(de.inum != 0\)) 109.2129 Tj
0 -132.9071 Td
(4711       return 0;) 87.3703 Tj
0 -142.4004 Td
(4712   }) 34.9481 Tj
0 -151.8938 Td
(4713   return 1;) 69.8962 Tj
0 -161.3871 Td
(4714 }) 26.2111 Tj
0 -170.8805 Td
(4715 ) 21.8426 Tj
0 -180.3739 Td
(4716 ) 21.8426 Tj
0 -189.8672 Td
(4717 ) 21.8426 Tj
0 -199.3606 Td
(4718 ) 21.8426 Tj
0 -208.8539 Td
(4719 ) 21.8426 Tj
0 -218.3473 Td
(4720 ) 21.8426 Tj
0 -227.8407 Td
(4721 ) 21.8426 Tj
0 -237.334 Td
(4722 ) 21.8426 Tj
0 -246.8274 Td
(4723 ) 21.8426 Tj
0 -256.3207 Td
(4724 ) 21.8426 Tj
0 -265.8141 Td
(4725 ) 21.8426 Tj
0 -275.3075 Td
(4726 ) 21.8426 Tj
0 -284.8008 Td
(4727 ) 21.8426 Tj
0 -294.2942 Td
(4728 ) 21.8426 Tj
0 -303.7875 Td
(4729 ) 21.8426 Tj
0 -313.2809 Td
(4730 ) 21.8426 Tj
0 -322.7743 Td
(4731 ) 21.8426 Tj
0 -332.2676 Td
(4732 ) 21.8426 Tj
0 -341.761 Td
(4733 ) 21.8426 Tj
0 -351.2543 Td
(4734 ) 21.8426 Tj
0 -360.7477 Td
(4735 ) 21.8426 Tj
0 -370.2411 Td
(4736 ) 21.8426 Tj
0 -379.7344 Td
(4737 ) 21.8426 Tj
0 -389.2278 Td
(4738 ) 21.8426 Tj
0 -398.7211 Td
(4739 ) 21.8426 Tj
0 -408.2145 Td
(4740 ) 21.8426 Tj
0 -417.7079 Td
(4741 ) 21.8426 Tj
0 -427.2012 Td
(4742 ) 21.8426 Tj
0 -436.6946 Td
(4743 ) 21.8426 Tj
0 -446.1879 Td
(4744 ) 21.8426 Tj
0 -455.6813 Td
(4745 ) 21.8426 Tj
0 -465.1747 Td
(4746 ) 21.8426 Tj
0 -474.668 Td
(4747 ) 21.8426 Tj
0 -484.1614 Td
(4748 ) 21.8426 Tj
0 -493.6547 Td
(4749 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 47) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/sysfile.c  Page 5) 174.7406 Tj
0 -28.4801 Td
(4750 int) 34.9481 Tj
0 -37.9735 Td
(4751 sys_unlink\(void\)) 91.7388 Tj
0 -47.4668 Td
(4752 {) 26.2111 Tj
0 -56.9602 Td
(4753   struct inode *ip, *dp;) 126.6869 Tj
0 -66.4535 Td
(4754   struct dirent de;) 104.8443 Tj
0 -75.9469 Td
(4755   char name[DIRSIZ], *path;) 139.7925 Tj
0 -85.4403 Td
(4756   uint off;) 69.8962 Tj
0 -94.9336 Td
(4757 ) 21.8426 Tj
0 -104.427 Td
(4758   if\(argstr\(0, &path\) < 0\)) 135.4239 Tj
0 -113.9203 Td
(4759     return -1;) 83.0018 Tj
0 -123.4137 Td
(4760   if\(\(dp = nameiparent\(path, name\)\) == 0\)) 200.9517 Tj
0 -132.9071 Td
(4761     return -1;) 83.0018 Tj
0 -142.4004 Td
(4762   ilock\(dp\);) 74.2647 Tj
0 -151.8938 Td
(4763 ) 21.8426 Tj
0 -161.3871 Td
(4764   // Cannot unlink "." or "..".) 157.2665 Tj
0 -170.8805 Td
(4765   if\(namecmp\(name, "."\) == 0 || namecmp\(name, ".."\) =\
= 0\){) 275.2164 Tj
0 -180.3739 Td
(4766     iunlockput\(dp\);) 104.8443 Tj
0 -189.8672 Td
(4767     return -1;) 83.0018 Tj
0 -199.3606 Td
(4768   }) 34.9481 Tj
0 -208.8539 Td
(4769 ) 21.8426 Tj
0 -218.3473 Td
(4770   if\(\(ip = dirlookup\(dp, name, &off\)\) == 0\){) 214.0572 Tj
0 -227.8407 Td
(4771     iunlockput\(dp\);) 104.8443 Tj
0 -237.334 Td
(4772     return -1;) 83.0018 Tj
0 -246.8274 Td
(4773   }) 34.9481 Tj
0 -256.3207 Td
(4774   ilock\(ip\);) 74.2647 Tj
0 -265.8141 Td
(4775 ) 21.8426 Tj
0 -275.3075 Td
(4776   if\(ip->nlink < 1\)) 104.8443 Tj
0 -284.8008 Td
(4777     panic\("unlink: nlink < 1"\);) 157.2665 Tj
0 -294.2942 Td
(4778   if\(ip->type == T_DIR && !isdirempty\(ip\)\){) 209.6887 Tj
0 -303.7875 Td
(4779     iunlockput\(ip\);) 104.8443 Tj
0 -313.2809 Td
(4780     iunlockput\(dp\);) 104.8443 Tj
0 -322.7743 Td
(4781     return -1;) 83.0018 Tj
0 -332.2676 Td
(4782   }) 34.9481 Tj
0 -341.761 Td
(4783 ) 21.8426 Tj
0 -351.2543 Td
(4784   memset\(&de, 0, sizeof\(de\)\);) 148.5295 Tj
0 -360.7477 Td
(4785   if\(writei\(dp, \(char*\)&de, off, sizeof\(de\)\) != siz\
eof\(de\)\)) 279.5849 Tj
0 -370.2411 Td
(4786     panic\("unlink: writei"\);) 144.161 Tj
0 -379.7344 Td
(4787   if\(ip->type == T_DIR\){) 126.6869 Tj
0 -389.2278 Td
(4788     dp->nlink--;) 91.7388 Tj
0 -398.7211 Td
(4789     iupdate\(dp\);) 91.7388 Tj
0 -408.2145 Td
(4790   }) 34.9481 Tj
0 -417.7079 Td
(4791   iunlockput\(dp\);) 96.1073 Tj
0 -427.2012 Td
(4792 ) 21.8426 Tj
0 -436.6946 Td
(4793   ip->nlink--;) 83.0018 Tj
0 -446.1879 Td
(4794   iupdate\(ip\);) 83.0018 Tj
0 -455.6813 Td
(4795   iunlockput\(ip\);) 96.1073 Tj
0 -465.1747 Td
(4796   return 0;) 69.8962 Tj
0 -474.668 Td
(4797 }) 26.2111 Tj
0 -484.1614 Td
(4798 ) 21.8426 Tj
0 -493.6547 Td
(4799 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 47) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 55 55
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/sysfile.c  Page 6) 174.7406 Tj
0 -28.4801 Td
(4800 static struct inode*) 109.2129 Tj
0 -37.9735 Td
(4801 create\(char *path, short type, short major, short minor\)) 266.4794 Tj
0 -47.4668 Td
(4802 {) 26.2111 Tj
0 -56.9602 Td
(4803   uint off;) 69.8962 Tj
0 -66.4535 Td
(4804   struct inode *ip, *dp;) 126.6869 Tj
0 -75.9469 Td
(4805   char name[DIRSIZ];) 109.2129 Tj
0 -85.4403 Td
(4806 ) 21.8426 Tj
0 -94.9336 Td
(4807   if\(\(dp = nameiparent\(path, name\)\) == 0\)) 200.9517 Tj
0 -104.427 Td
(4808     return 0;) 78.6333 Tj
0 -113.9203 Td
(4809   ilock\(dp\);) 74.2647 Tj
0 -123.4137 Td
(4810 ) 21.8426 Tj
0 -132.9071 Td
(4811   if\(\(ip = dirlookup\(dp, name, &off\)\) != 0\){) 214.0572 Tj
0 -142.4004 Td
(4812     iunlockput\(dp\);) 104.8443 Tj
0 -151.8938 Td
(4813     ilock\(ip\);) 83.0018 Tj
0 -161.3871 Td
(4814     if\(type == T_FILE && ip->type == T_FILE\)) 214.0572 Tj
0 -170.8805 Td
(4815       return ip;) 91.7388 Tj
0 -180.3739 Td
(4816     iunlockput\(ip\);) 104.8443 Tj
0 -189.8672 Td
(4817     return 0;) 78.6333 Tj
0 -199.3606 Td
(4818   }) 34.9481 Tj
0 -208.8539 Td
(4819 ) 21.8426 Tj
0 -218.3473 Td
(4820   if\(\(ip = ialloc\(dp->dev, type\)\) == 0\)) 192.2146 Tj
0 -227.8407 Td
(4821     panic\("create: ialloc"\);) 144.161 Tj
0 -237.334 Td
(4822 ) 21.8426 Tj
0 -246.8274 Td
(4823   ilock\(ip\);) 74.2647 Tj
0 -256.3207 Td
(4824   ip->major = major;) 109.2129 Tj
0 -265.8141 Td
(4825   ip->minor = minor;) 109.2129 Tj
0 -275.3075 Td
(4826   ip->nlink = 1;) 91.7388 Tj
0 -284.8008 Td
(4827   iupdate\(ip\);) 83.0018 Tj
0 -294.2942 Td
(4828 ) 21.8426 Tj
0 -303.7875 Td
(4829   if\(type == T_DIR\){  // Create . and .. entries.) 235.8998 Tj
0 -313.2809 Td
(4830     dp->nlink++;  // for "..") 148.5295 Tj
0 -322.7743 Td
(4831     iupdate\(dp\);) 91.7388 Tj
0 -332.2676 Td
(4832     // No ip->nlink++ for ".": avoid cyclic ref count.) 257.7424 Tj
0 -341.761 Td
(4833     if\(dirlink\(ip, ".", ip->inum\) < 0 || dirlink\(ip, "\
..", dp->inum\) < 0\)) 340.7441 Tj
0 -351.2543 Td
(4834       panic\("create dots"\);) 139.7925 Tj
0 -360.7477 Td
(4835   }) 34.9481 Tj
0 -370.2411 Td
(4836 ) 21.8426 Tj
0 -379.7344 Td
(4837   if\(dirlink\(dp, name, ip->inum\) < 0\)) 183.4776 Tj
0 -389.2278 Td
(4838     panic\("create: dirlink"\);) 148.5295 Tj
0 -398.7211 Td
(4839 ) 21.8426 Tj
0 -408.2145 Td
(4840   iunlockput\(dp\);) 96.1073 Tj
0 -417.7079 Td
(4841   return ip;) 74.2647 Tj
0 -427.2012 Td
(4842 }) 26.2111 Tj
0 -436.6946 Td
(4843 ) 21.8426 Tj
0 -446.1879 Td
(4844 ) 21.8426 Tj
0 -455.6813 Td
(4845 ) 21.8426 Tj
0 -465.1747 Td
(4846 ) 21.8426 Tj
0 -474.668 Td
(4847 ) 21.8426 Tj
0 -484.1614 Td
(4848 ) 21.8426 Tj
0 -493.6547 Td
(4849 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 48) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/sysfile.c  Page 7) 174.7406 Tj
0 -28.4801 Td
(4850 int) 34.9481 Tj
0 -37.9735 Td
(4851 sys_open\(void\)) 83.0018 Tj
0 -47.4668 Td
(4852 {) 26.2111 Tj
0 -56.9602 Td
(4853   char *path;) 78.6333 Tj
0 -66.4535 Td
(4854   int fd, omode;) 91.7388 Tj
0 -75.9469 Td
(4855   struct file *f;) 96.1073 Tj
0 -85.4403 Td
(4856   struct inode *ip;) 104.8443 Tj
0 -94.9336 Td
(4857 ) 21.8426 Tj
0 -104.427 Td
(4858   if\(argstr\(0, &path\) < 0 || argint\(1, &omode\) < 0\)) 244.6368 Tj
0 -113.9203 Td
(4859     return -1;) 83.0018 Tj
0 -123.4137 Td
(4860 ) 21.8426 Tj
0 -132.9071 Td
(4861   if\(omode & O_CREATE\){) 122.3184 Tj
0 -142.4004 Td
(4862     if\(\(ip = create\(path, T_FILE, 0, 0\)\) == 0\)) 222.7942 Tj
0 -151.8938 Td
(4863       return -1;) 91.7388 Tj
0 -161.3871 Td
(4864   } else {) 65.5277 Tj
0 -170.8805 Td
(4865     if\(\(ip = namei\(path\)\) == 0\)) 157.2665 Tj
0 -180.3739 Td
(4866       return -1;) 91.7388 Tj
0 -189.8672 Td
(4867     ilock\(ip\);) 83.0018 Tj
0 -199.3606 Td
(4868     if\(ip->type == T_DIR && omode != O_RDONLY\){) 227.1628 Tj
0 -208.8539 Td
(4869       iunlockput\(ip\);) 113.5814 Tj
0 -218.3473 Td
(4870       return -1;) 91.7388 Tj
0 -227.8407 Td
(4871     }) 43.6851 Tj
0 -237.334 Td
(4872   }) 34.9481 Tj
0 -246.8274 Td
(4873 ) 21.8426 Tj
0 -256.3207 Td
(4874   if\(\(f = filealloc\(\)\) == 0 || \(fd = fdalloc\(f\)\) \
< 0\){) 257.7424 Tj
0 -265.8141 Td
(4875     if\(f\)) 61.1592 Tj
0 -275.3075 Td
(4876       fileclose\(f\);) 104.8443 Tj
0 -284.8008 Td
(4877     iunlockput\(ip\);) 104.8443 Tj
0 -294.2942 Td
(4878     return -1;) 83.0018 Tj
0 -303.7875 Td
(4879   }) 34.9481 Tj
0 -313.2809 Td
(4880   iunlock\(ip\);) 83.0018 Tj
0 -322.7743 Td
(4881 ) 21.8426 Tj
0 -332.2676 Td
(4882   f->type = FD_INODE;) 113.5814 Tj
0 -341.761 Td
(4883   f->ip = ip;) 78.6333 Tj
0 -351.2543 Td
(4884   f->off = 0;) 78.6333 Tj
0 -360.7477 Td
(4885   f->readable = !\(omode & O_WRONLY\);) 179.1091 Tj
0 -370.2411 Td
(4886   f->writable = \(omode & O_WRONLY\) || \(omode & O_RDWR\)\
;) 262.1109 Tj
0 -379.7344 Td
(4887 ) 21.8426 Tj
0 -389.2278 Td
(4888   return fd;) 74.2647 Tj
0 -398.7211 Td
(4889 }) 26.2111 Tj
0 -408.2145 Td
(4890 ) 21.8426 Tj
0 -417.7079 Td
(4891 ) 21.8426 Tj
0 -427.2012 Td
(4892 ) 21.8426 Tj
0 -436.6946 Td
(4893 ) 21.8426 Tj
0 -446.1879 Td
(4894 ) 21.8426 Tj
0 -455.6813 Td
(4895 ) 21.8426 Tj
0 -465.1747 Td
(4896 ) 21.8426 Tj
0 -474.668 Td
(4897 ) 21.8426 Tj
0 -484.1614 Td
(4898 ) 21.8426 Tj
0 -493.6547 Td
(4899 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 48) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 56 56
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/sysfile.c  Page 8) 174.7406 Tj
0 -28.4801 Td
(4900 int) 34.9481 Tj
0 -37.9735 Td
(4901 sys_mkdir\(void\)) 87.3703 Tj
0 -47.4668 Td
(4902 {) 26.2111 Tj
0 -56.9602 Td
(4903   char *path;) 78.6333 Tj
0 -66.4535 Td
(4904   struct inode *ip;) 104.8443 Tj
0 -75.9469 Td
(4905 ) 21.8426 Tj
0 -85.4403 Td
(4906   if\(argstr\(0, &path\) < 0 || \(ip = create\(path, T_DIR\
, 0, 0\)\) == 0\)) 314.533 Tj
0 -94.9336 Td
(4907     return -1;) 83.0018 Tj
0 -104.427 Td
(4908   iunlockput\(ip\);) 96.1073 Tj
0 -113.9203 Td
(4909   return 0;) 69.8962 Tj
0 -123.4137 Td
(4910 }) 26.2111 Tj
0 -132.9071 Td
(4911 ) 21.8426 Tj
0 -142.4004 Td
(4912 int) 34.9481 Tj
0 -151.8938 Td
(4913 sys_mknod\(void\)) 87.3703 Tj
0 -161.3871 Td
(4914 {) 26.2111 Tj
0 -170.8805 Td
(4915   struct inode *ip;) 104.8443 Tj
0 -180.3739 Td
(4916   char *path;) 78.6333 Tj
0 -189.8672 Td
(4917   int len;) 65.5277 Tj
0 -199.3606 Td
(4918   int major, minor;) 104.8443 Tj
0 -208.8539 Td
(4919 ) 21.8426 Tj
0 -218.3473 Td
(4920   if\(\(len=argstr\(0, &path\)\) < 0 ||) 170.3721 Tj
0 -227.8407 Td
(4921      argint\(1, &major\) < 0 ||) 148.5295 Tj
0 -237.334 Td
(4922      argint\(2, &minor\) < 0 ||) 148.5295 Tj
0 -246.8274 Td
(4923      \(ip = create\(path, T_DEV, major, minor\)\) == 0\)) 244.6368 Tj
0 -256.3207 Td
(4924     return -1;) 83.0018 Tj
0 -265.8141 Td
(4925   iunlockput\(ip\);) 96.1073 Tj
0 -275.3075 Td
(4926   return 0;) 69.8962 Tj
0 -284.8008 Td
(4927 }) 26.2111 Tj
0 -294.2942 Td
(4928 ) 21.8426 Tj
0 -303.7875 Td
(4929 int) 34.9481 Tj
0 -313.2809 Td
(4930 sys_chdir\(void\)) 87.3703 Tj
0 -322.7743 Td
(4931 {) 26.2111 Tj
0 -332.2676 Td
(4932   char *path;) 78.6333 Tj
0 -341.761 Td
(4933   struct inode *ip;) 104.8443 Tj
0 -351.2543 Td
(4934 ) 21.8426 Tj
0 -360.7477 Td
(4935   if\(argstr\(0, &path\) < 0 || \(ip = namei\(path\)\) == \
0\)) 253.3738 Tj
0 -370.2411 Td
(4936     return -1;) 83.0018 Tj
0 -379.7344 Td
(4937   ilock\(ip\);) 74.2647 Tj
0 -389.2278 Td
(4938   if\(ip->type != T_DIR\){) 126.6869 Tj
0 -398.7211 Td
(4939     iunlockput\(ip\);) 104.8443 Tj
0 -408.2145 Td
(4940     return -1;) 83.0018 Tj
0 -417.7079 Td
(4941   }) 34.9481 Tj
0 -427.2012 Td
(4942   iunlock\(ip\);) 83.0018 Tj
0 -436.6946 Td
(4943   iput\(cp->cwd\);) 91.7388 Tj
0 -446.1879 Td
(4944   cp->cwd = ip;) 87.3703 Tj
0 -455.6813 Td
(4945   return 0;) 69.8962 Tj
0 -465.1747 Td
(4946 }) 26.2111 Tj
0 -474.668 Td
(4947 ) 21.8426 Tj
0 -484.1614 Td
(4948 ) 21.8426 Tj
0 -493.6547 Td
(4949 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 49) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/sysfile.c  Page 9) 174.7406 Tj
0 -28.4801 Td
(4950 int) 34.9481 Tj
0 -37.9735 Td
(4951 sys_exec\(void\)) 83.0018 Tj
0 -47.4668 Td
(4952 {) 26.2111 Tj
0 -56.9602 Td
(4953   char *path, *argv[20];) 126.6869 Tj
0 -66.4535 Td
(4954   int i;) 56.7907 Tj
0 -75.9469 Td
(4955   uint uargv, uarg;) 104.8443 Tj
0 -85.4403 Td
(4956 ) 21.8426 Tj
0 -94.9336 Td
(4957   if\(argstr\(0, &path\) < 0 || argint\(1, \(int*\)&uargv\)\
 < 0\)) 270.8479 Tj
0 -104.427 Td
(4958     return -1;) 83.0018 Tj
0 -113.9203 Td
(4959   memset\(argv, 0, sizeof\(argv\)\);) 161.635 Tj
0 -123.4137 Td
(4960   for\(i=0;; i++\){) 96.1073 Tj
0 -132.9071 Td
(4961     if\(i >= NELEM\(argv\)\)) 126.6869 Tj
0 -142.4004 Td
(4962       return -1;) 91.7388 Tj
0 -151.8938 Td
(4963     if\(fetchint\(cp, uargv+4*i, \(int*\)&uarg\) < 0\)) 231.5313 Tj
0 -161.3871 Td
(4964       return -1;) 91.7388 Tj
0 -170.8805 Td
(4965     if\(uarg == 0\){) 100.4758 Tj
0 -180.3739 Td
(4966       argv[i] = 0;) 100.4758 Tj
0 -189.8672 Td
(4967       break;) 74.2647 Tj
0 -199.3606 Td
(4968     }) 43.6851 Tj
0 -208.8539 Td
(4969     if\(fetchstr\(cp, uarg, &argv[i]\) < 0\)) 196.5831 Tj
0 -218.3473 Td
(4970       return -1;) 91.7388 Tj
0 -227.8407 Td
(4971   }) 34.9481 Tj
0 -237.334 Td
(4972   return exec\(path, argv\);) 135.4239 Tj
0 -246.8274 Td
(4973 }) 26.2111 Tj
0 -256.3207 Td
(4974 ) 21.8426 Tj
0 -265.8141 Td
(4975 int) 34.9481 Tj
0 -275.3075 Td
(4976 sys_pipe\(void\)) 83.0018 Tj
0 -284.8008 Td
(4977 {) 26.2111 Tj
0 -294.2942 Td
(4978   int *fd;) 65.5277 Tj
0 -303.7875 Td
(4979   struct file *rf, *wf;) 122.3184 Tj
0 -313.2809 Td
(4980   int fd0, fd1;) 87.3703 Tj
0 -322.7743 Td
(4981 ) 21.8426 Tj
0 -332.2676 Td
(4982   if\(argptr\(0, \(void*\)&fd, 2*sizeof\(fd[0]\)\) < 0\)) 231.5313 Tj
0 -341.761 Td
(4983     return -1;) 83.0018 Tj
0 -351.2543 Td
(4984   if\(pipealloc\(&rf, &wf\) < 0\)) 148.5295 Tj
0 -360.7477 Td
(4985     return -1;) 83.0018 Tj
0 -370.2411 Td
(4986   fd0 = -1;) 69.8962 Tj
0 -379.7344 Td
(4987   if\(\(fd0 = fdalloc\(rf\)\) < 0 || \(fd1 = fdalloc\(wf\)\
\) < 0\){) 270.8479 Tj
0 -389.2278 Td
(4988     if\(fd0 >= 0\)) 91.7388 Tj
0 -398.7211 Td
(4989       cp->ofile[fd0] = 0;) 131.0554 Tj
0 -408.2145 Td
(4990     fileclose\(rf\);) 100.4758 Tj
0 -417.7079 Td
(4991     fileclose\(wf\);) 100.4758 Tj
0 -427.2012 Td
(4992     return -1;) 83.0018 Tj
0 -436.6946 Td
(4993   }) 34.9481 Tj
0 -446.1879 Td
(4994   fd[0] = fd0;) 83.0018 Tj
0 -455.6813 Td
(4995   fd[1] = fd1;) 83.0018 Tj
0 -465.1747 Td
(4996   return 0;) 69.8962 Tj
0 -474.668 Td
(4997 }) 26.2111 Tj
0 -484.1614 Td
(4998 ) 21.8426 Tj
0 -493.6547 Td
(4999 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 49) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 57 57
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/exec.c  Page 1) 161.635 Tj
0 -28.4801 Td
(5000 #include "types.h") 100.4758 Tj
0 -37.9735 Td
(5001 #include "param.h") 100.4758 Tj
0 -47.4668 Td
(5002 #include "mmu.h") 91.7388 Tj
0 -56.9602 Td
(5003 #include "proc.h") 96.1073 Tj
0 -66.4535 Td
(5004 #include "defs.h") 96.1073 Tj
0 -75.9469 Td
(5005 #include "x86.h") 91.7388 Tj
0 -85.4403 Td
(5006 #include "elf.h") 91.7388 Tj
0 -94.9336 Td
(5007 ) 21.8426 Tj
0 -104.427 Td
(5008 int) 34.9481 Tj
0 -113.9203 Td
(5009 exec\(char *path, char **argv\)) 148.5295 Tj
0 -123.4137 Td
(5010 {) 26.2111 Tj
0 -132.9071 Td
(5011   char *mem, *s, *last;) 122.3184 Tj
0 -142.4004 Td
(5012   int i, argc, arglen, len, off;) 161.635 Tj
0 -151.8938 Td
(5013   uint sz, sp, argp, x;) 122.3184 Tj
0 -161.3871 Td
(5014   struct elfhdr elf;) 109.2129 Tj
0 -170.8805 Td
(5015   struct inode *ip;) 104.8443 Tj
0 -180.3739 Td
(5016   struct proghdr ph;) 109.2129 Tj
0 -189.8672 Td
(5017 ) 21.8426 Tj
0 -199.3606 Td
(5018   mem = 0;) 65.5277 Tj
0 -208.8539 Td
(5019   sz = 0;) 61.1592 Tj
0 -218.3473 Td
(5020 ) 21.8426 Tj
0 -227.8407 Td
(5021   if\(\(ip = namei\(path\)\) == 0\)) 148.5295 Tj
0 -237.334 Td
(5022     return -1;) 83.0018 Tj
0 -246.8274 Td
(5023   ilock\(ip\);) 74.2647 Tj
0 -256.3207 Td
(5024 ) 21.8426 Tj
0 -265.8141 Td
(5025   // Check ELF header) 113.5814 Tj
0 -275.3075 Td
(5026   if\(readi\(ip, \(char*\)&elf, 0, sizeof\(elf\)\) < sizeo\
f\(elf\)\)) 275.2164 Tj
0 -284.8008 Td
(5027     goto bad;) 78.6333 Tj
0 -294.2942 Td
(5028   if\(elf.magic != ELF_MAGIC\)) 144.161 Tj
0 -303.7875 Td
(5029     goto bad;) 78.6333 Tj
0 -313.2809 Td
(5030 ) 21.8426 Tj
0 -322.7743 Td
(5031   // Compute memory size of new process.) 196.5831 Tj
0 -332.2676 Td
(5032   // Program segments.) 117.9499 Tj
0 -341.761 Td
(5033   for\(i=0, off=elf.phoff; i<elf.phnum; i++, off+=sizeof\(\
ph\)\){) 288.322 Tj
0 -351.2543 Td
(5034     if\(readi\(ip, \(char*\)&ph, off, sizeof\(ph\)\) != si\
zeof\(ph\)\)) 283.9534 Tj
0 -360.7477 Td
(5035       goto bad;) 87.3703 Tj
0 -370.2411 Td
(5036     if\(ph.type != ELF_PROG_LOAD\)) 161.635 Tj
0 -379.7344 Td
(5037       continue;) 87.3703 Tj
0 -389.2278 Td
(5038     if\(ph.memsz < ph.filesz\)) 144.161 Tj
0 -398.7211 Td
(5039       goto bad;) 87.3703 Tj
0 -408.2145 Td
(5040     sz += ph.memsz;) 104.8443 Tj
0 -417.7079 Td
(5041   }) 34.9481 Tj
0 -427.2012 Td
(5042 ) 21.8426 Tj
0 -436.6946 Td
(5043   // Arguments.) 87.3703 Tj
0 -446.1879 Td
(5044   arglen = 0;) 78.6333 Tj
0 -455.6813 Td
(5045   for\(argc=0; argv[argc]; argc++\)) 166.0035 Tj
0 -465.1747 Td
(5046     arglen += strlen\(argv[argc]\) + 1;) 183.4776 Tj
0 -474.668 Td
(5047   arglen = \(arglen+3\) & ~3;) 139.7925 Tj
0 -484.1614 Td
(5048   sz += arglen;) 87.3703 Tj
0 -493.6547 Td
(5049   sz += 4*\(argc+1\);  // argv data) 166.0035 Tj
0 -522.1348 Td
(Sheet 50) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/exec.c  Page 2) 161.635 Tj
0 -28.4801 Td
(5050   sz += 4;  // argv) 104.8443 Tj
0 -37.9735 Td
(5051   sz += 4;  // argc) 104.8443 Tj
0 -47.4668 Td
(5052 ) 21.8426 Tj
0 -56.9602 Td
(5053   // Stack.) 69.8962 Tj
0 -66.4535 Td
(5054   sz += PAGE;) 78.6333 Tj
0 -75.9469 Td
(5055 ) 21.8426 Tj
0 -85.4403 Td
(5056   // Allocate program memory.) 148.5295 Tj
0 -94.9336 Td
(5057   sz = \(sz+PAGE-1\) & ~\(PAGE-1\);) 157.2665 Tj
0 -104.427 Td
(5058   mem = kalloc\(sz\);) 104.8443 Tj
0 -113.9203 Td
(5059   if\(mem == 0\)) 83.0018 Tj
0 -123.4137 Td
(5060     goto bad;) 78.6333 Tj
0 -132.9071 Td
(5061   memset\(mem, 0, sz\);) 113.5814 Tj
0 -142.4004 Td
(5062 ) 21.8426 Tj
0 -151.8938 Td
(5063   // Load program into memory.) 152.898 Tj
0 -161.3871 Td
(5064   for\(i=0, off=elf.phoff; i<elf.phnum; i++, off+=sizeof\(\
ph\)\){) 288.322 Tj
0 -170.8805 Td
(5065     if\(readi\(ip, \(char*\)&ph, off, sizeof\(ph\)\) != si\
zeof\(ph\)\)) 283.9534 Tj
0 -180.3739 Td
(5066       goto bad;) 87.3703 Tj
0 -189.8672 Td
(5067     if\(ph.type != ELF_PROG_LOAD\)) 161.635 Tj
0 -199.3606 Td
(5068       continue;) 87.3703 Tj
0 -208.8539 Td
(5069     if\(ph.va + ph.memsz < ph.va || ph.va + ph.memsz > sz\)) 270.8479 Tj
0 -218.3473 Td
(5070       goto bad;) 87.3703 Tj
0 -227.8407 Td
(5071     if\(ph.memsz < ph.filesz\)) 144.161 Tj
0 -237.334 Td
(5072       goto bad;) 87.3703 Tj
0 -246.8274 Td
(5073     if\(readi\(ip, mem + ph.va, ph.offset, ph.filesz\) != \
ph.filesz\)) 305.796 Tj
0 -256.3207 Td
(5074       goto bad;) 87.3703 Tj
0 -265.8141 Td
(5075     memset\(mem + ph.va + ph.filesz, 0, ph.memsz - ph.file\
sz\);) 288.322 Tj
0 -275.3075 Td
(5076   }) 34.9481 Tj
0 -284.8008 Td
(5077   iunlockput\(ip\);) 96.1073 Tj
0 -294.2942 Td
(5078 ) 21.8426 Tj
0 -303.7875 Td
(5079   // Initialize stack.) 117.9499 Tj
0 -313.2809 Td
(5080   sp = sz;) 65.5277 Tj
0 -322.7743 Td
(5081   argp = sz - arglen - 4*\(argc+1\);) 170.3721 Tj
0 -332.2676 Td
(5082 ) 21.8426 Tj
0 -341.761 Td
(5083   // Copy argv strings and pointers to stack.) 218.4257 Tj
0 -351.2543 Td
(5084   *\(uint*\)\(mem+argp + 4*argc\) = 0;  // argv[argc]) 235.8998 Tj
0 -360.7477 Td
(5085   for\(i=argc-1; i>=0; i--\){) 139.7925 Tj
0 -370.2411 Td
(5086     len = strlen\(argv[i]\) + 1;) 152.898 Tj
0 -379.7344 Td
(5087     sp -= len;) 83.0018 Tj
0 -389.2278 Td
(5088     memmove\(mem+sp, argv[i], len\);) 170.3721 Tj
0 -398.7211 Td
(5089     *\(uint*\)\(mem+argp + 4*i\) = sp;  // argv[i]) 222.7942 Tj
0 -408.2145 Td
(5090   }) 34.9481 Tj
0 -417.7079 Td
(5091 ) 21.8426 Tj
0 -427.2012 Td
(5092   // Stack frame for main\(argc, argv\), below arguments.) 262.1109 Tj
0 -436.6946 Td
(5093   sp = argp;) 74.2647 Tj
0 -446.1879 Td
(5094   sp -= 4;) 65.5277 Tj
0 -455.6813 Td
(5095   *\(uint*\)\(mem+sp\) = argp;) 135.4239 Tj
0 -465.1747 Td
(5096   sp -= 4;) 65.5277 Tj
0 -474.668 Td
(5097   *\(uint*\)\(mem+sp\) = argc;) 135.4239 Tj
0 -484.1614 Td
(5098   sp -= 4;) 65.5277 Tj
0 -493.6547 Td
(5099   *\(uint*\)\(mem+sp\) = 0xffffffff;   // fake return pc) 249.0053 Tj
0 -522.1348 Td
(Sheet 50) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 58 58
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/exec.c  Page 3) 161.635 Tj
0 -28.4801 Td
(5100   // Save program name for debugging.) 183.4776 Tj
0 -37.9735 Td
(5101   for\(last=s=path; *s; s++\)) 139.7925 Tj
0 -47.4668 Td
(5102     if\(*s == '/'\)) 96.1073 Tj
0 -56.9602 Td
(5103       last = s+1;) 96.1073 Tj
0 -66.4535 Td
(5104   safestrcpy\(cp->name, last, sizeof\(cp->name\)\);) 227.1628 Tj
0 -75.9469 Td
(5105 ) 21.8426 Tj
0 -85.4403 Td
(5106   // Commit to the new image.) 148.5295 Tj
0 -94.9336 Td
(5107   kfree\(cp->mem, cp->sz\);) 131.0554 Tj
0 -104.427 Td
(5108   cp->mem = mem;) 91.7388 Tj
0 -113.9203 Td
(5109   cp->sz = sz;) 83.0018 Tj
0 -123.4137 Td
(5110   cp->tf->eip = elf.entry;  // main) 174.7406 Tj
0 -132.9071 Td
(5111   cp->tf->esp = sp;) 104.8443 Tj
0 -142.4004 Td
(5112   usegment\(\);) 78.6333 Tj
0 -151.8938 Td
(5113   return 0;) 69.8962 Tj
0 -161.3871 Td
(5114 ) 21.8426 Tj
0 -170.8805 Td
(5115  bad:) 43.6851 Tj
0 -180.3739 Td
(5116   if\(mem\)) 61.1592 Tj
0 -189.8672 Td
(5117     kfree\(mem, sz\);) 104.8443 Tj
0 -199.3606 Td
(5118   iunlockput\(ip\);) 96.1073 Tj
0 -208.8539 Td
(5119   return -1;) 74.2647 Tj
0 -218.3473 Td
(5120 }) 26.2111 Tj
0 -227.8407 Td
(5121 ) 21.8426 Tj
0 -237.334 Td
(5122 ) 21.8426 Tj
0 -246.8274 Td
(5123 ) 21.8426 Tj
0 -256.3207 Td
(5124 ) 21.8426 Tj
0 -265.8141 Td
(5125 ) 21.8426 Tj
0 -275.3075 Td
(5126 ) 21.8426 Tj
0 -284.8008 Td
(5127 ) 21.8426 Tj
0 -294.2942 Td
(5128 ) 21.8426 Tj
0 -303.7875 Td
(5129 ) 21.8426 Tj
0 -313.2809 Td
(5130 ) 21.8426 Tj
0 -322.7743 Td
(5131 ) 21.8426 Tj
0 -332.2676 Td
(5132 ) 21.8426 Tj
0 -341.761 Td
(5133 ) 21.8426 Tj
0 -351.2543 Td
(5134 ) 21.8426 Tj
0 -360.7477 Td
(5135 ) 21.8426 Tj
0 -370.2411 Td
(5136 ) 21.8426 Tj
0 -379.7344 Td
(5137 ) 21.8426 Tj
0 -389.2278 Td
(5138 ) 21.8426 Tj
0 -398.7211 Td
(5139 ) 21.8426 Tj
0 -408.2145 Td
(5140 ) 21.8426 Tj
0 -417.7079 Td
(5141 ) 21.8426 Tj
0 -427.2012 Td
(5142 ) 21.8426 Tj
0 -436.6946 Td
(5143 ) 21.8426 Tj
0 -446.1879 Td
(5144 ) 21.8426 Tj
0 -455.6813 Td
(5145 ) 21.8426 Tj
0 -465.1747 Td
(5146 ) 21.8426 Tj
0 -474.668 Td
(5147 ) 21.8426 Tj
0 -484.1614 Td
(5148 ) 21.8426 Tj
0 -493.6547 Td
(5149 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 51) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/pipe.c  Page 1) 161.635 Tj
0 -28.4801 Td
(5150 #include "types.h") 100.4758 Tj
0 -37.9735 Td
(5151 #include "defs.h") 96.1073 Tj
0 -47.4668 Td
(5152 #include "param.h") 100.4758 Tj
0 -56.9602 Td
(5153 #include "mmu.h") 91.7388 Tj
0 -66.4535 Td
(5154 #include "proc.h") 96.1073 Tj
0 -75.9469 Td
(5155 #include "file.h") 96.1073 Tj
0 -85.4403 Td
(5156 #include "spinlock.h") 113.5814 Tj
0 -94.9336 Td
(5157 ) 21.8426 Tj
0 -104.427 Td
(5158 #define PIPESIZE 512) 109.2129 Tj
0 -113.9203 Td
(5159 ) 21.8426 Tj
0 -123.4137 Td
(5160 struct pipe {) 78.6333 Tj
0 -132.9071 Td
(5161   struct spinlock lock;) 122.3184 Tj
0 -142.4004 Td
(5162   char data[PIPESIZE];) 117.9499 Tj
0 -151.8938 Td
(5163   uint nread;     // number of bytes read) 200.9517 Tj
0 -161.3871 Td
(5164   uint nwrite;    // number of bytes written) 214.0572 Tj
0 -170.8805 Td
(5165   int readopen;   // read fd is still open) 205.3202 Tj
0 -180.3739 Td
(5166   int writeopen;  // write fd is still open) 209.6887 Tj
0 -189.8672 Td
(5167 };) 30.5796 Tj
0 -199.3606 Td
(5168 ) 21.8426 Tj
0 -208.8539 Td
(5169 int) 34.9481 Tj
0 -218.3473 Td
(5170 pipealloc\(struct file **f0, struct file **f1\)) 218.4257 Tj
0 -227.8407 Td
(5171 {) 26.2111 Tj
0 -237.334 Td
(5172   struct pipe *p;) 96.1073 Tj
0 -246.8274 Td
(5173 ) 21.8426 Tj
0 -256.3207 Td
(5174   p = 0;) 56.7907 Tj
0 -265.8141 Td
(5175   *f0 = *f1 = 0;) 91.7388 Tj
0 -275.3075 Td
(5176   if\(\(*f0 = filealloc\(\)\) == 0 || \(*f1 = filealloc\(\)\
\) == 0\)) 275.2164 Tj
0 -284.8008 Td
(5177     goto bad;) 78.6333 Tj
0 -294.2942 Td
(5178   if\(\(p = \(struct pipe*\)kalloc\(PAGE\)\) == 0\)) 209.6887 Tj
0 -303.7875 Td
(5179     goto bad;) 78.6333 Tj
0 -313.2809 Td
(5180   p->readopen = 1;) 100.4758 Tj
0 -322.7743 Td
(5181   p->writeopen = 1;) 104.8443 Tj
0 -332.2676 Td
(5182   p->nwrite = 0;) 91.7388 Tj
0 -341.761 Td
(5183   p->nread = 0;) 87.3703 Tj
0 -351.2543 Td
(5184   initlock\(&p->lock, "pipe"\);) 148.5295 Tj
0 -360.7477 Td
(5185   \(*f0\)->type = FD_PIPE;) 126.6869 Tj
0 -370.2411 Td
(5186   \(*f0\)->readable = 1;) 117.9499 Tj
0 -379.7344 Td
(5187   \(*f0\)->writable = 0;) 117.9499 Tj
0 -389.2278 Td
(5188   \(*f0\)->pipe = p;) 100.4758 Tj
0 -398.7211 Td
(5189   \(*f1\)->type = FD_PIPE;) 126.6869 Tj
0 -408.2145 Td
(5190   \(*f1\)->readable = 0;) 117.9499 Tj
0 -417.7079 Td
(5191   \(*f1\)->writable = 1;) 117.9499 Tj
0 -427.2012 Td
(5192   \(*f1\)->pipe = p;) 100.4758 Tj
0 -436.6946 Td
(5193   return 0;) 69.8962 Tj
0 -446.1879 Td
(5194 ) 21.8426 Tj
0 -455.6813 Td
(5195 ) 21.8426 Tj
0 -465.1747 Td
(5196 ) 21.8426 Tj
0 -474.668 Td
(5197 ) 21.8426 Tj
0 -484.1614 Td
(5198 ) 21.8426 Tj
0 -493.6547 Td
(5199 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 51) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 59 59
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/pipe.c  Page 2) 161.635 Tj
0 -28.4801 Td
(5200  bad:) 43.6851 Tj
0 -37.9735 Td
(5201   if\(p\)) 52.4222 Tj
0 -47.4668 Td
(5202     kfree\(\(char*\)p, PAGE\);) 135.4239 Tj
0 -56.9602 Td
(5203   if\(*f0\)) 61.1592 Tj
0 -66.4535 Td
(5204     fileclose\(*f0\);) 104.8443 Tj
0 -75.9469 Td
(5205   if\(*f1\)) 61.1592 Tj
0 -85.4403 Td
(5206     fileclose\(*f1\);) 104.8443 Tj
0 -94.9336 Td
(5207   return -1;) 74.2647 Tj
0 -104.427 Td
(5208 }) 26.2111 Tj
0 -113.9203 Td
(5209 ) 21.8426 Tj
0 -123.4137 Td
(5210 void) 39.3166 Tj
0 -132.9071 Td
(5211 pipeclose\(struct pipe *p, int writable\)) 192.2146 Tj
0 -142.4004 Td
(5212 {) 26.2111 Tj
0 -151.8938 Td
(5213   acquire\(&p->lock\);) 109.2129 Tj
0 -161.3871 Td
(5214   if\(writable\){) 87.3703 Tj
0 -170.8805 Td
(5215     p->writeopen = 0;) 113.5814 Tj
0 -180.3739 Td
(5216     wakeup\(&p->nread\);) 117.9499 Tj
0 -189.8672 Td
(5217   } else {) 65.5277 Tj
0 -199.3606 Td
(5218     p->readopen = 0;) 109.2129 Tj
0 -208.8539 Td
(5219     wakeup\(&p->nwrite\);) 122.3184 Tj
0 -218.3473 Td
(5220   }) 34.9481 Tj
0 -227.8407 Td
(5221   if\(p->readopen == 0 && p->writeopen == 0\) {) 218.4257 Tj
0 -237.334 Td
(5222     release\(&p->lock\);) 117.9499 Tj
0 -246.8274 Td
(5223     kfree\(\(char*\)p, PAGE\);) 135.4239 Tj
0 -256.3207 Td
(5224   } else) 56.7907 Tj
0 -265.8141 Td
(5225     release\(&p->lock\);) 117.9499 Tj
0 -275.3075 Td
(5226 }) 26.2111 Tj
0 -284.8008 Td
(5227 ) 21.8426 Tj
0 -294.2942 Td
(5228 ) 21.8426 Tj
0 -303.7875 Td
(5229 int) 34.9481 Tj
0 -313.2809 Td
(5230 pipewrite\(struct pipe *p, char *addr, int n\)) 214.0572 Tj
0 -322.7743 Td
(5231 {) 26.2111 Tj
0 -332.2676 Td
(5232   int i;) 56.7907 Tj
0 -341.761 Td
(5233 ) 21.8426 Tj
0 -351.2543 Td
(5234   acquire\(&p->lock\);) 109.2129 Tj
0 -360.7477 Td
(5235   for\(i = 0; i < n; i++\){) 131.0554 Tj
0 -370.2411 Td
(5236     while\(p->nwrite == p->nread + PIPESIZE\) {  ) 227.1628 Tj
0 -379.7344 Td
(5237       if\(p->readopen == 0 || cp->killed\){) 200.9517 Tj
0 -389.2278 Td
(5238         release\(&p->lock\);) 135.4239 Tj
0 -398.7211 Td
(5239         return -1;) 100.4758 Tj
0 -408.2145 Td
(5240       }) 52.4222 Tj
0 -417.7079 Td
(5241       wakeup\(&p->nread\);) 126.6869 Tj
0 -427.2012 Td
(5242       sleep\(&p->nwrite, &p->lock\);  ) 179.1091 Tj
0 -436.6946 Td
(5243     }) 43.6851 Tj
0 -446.1879 Td
(5244     p->data[p->nwrite++ % PIPESIZE] = addr[i];) 222.7942 Tj
0 -455.6813 Td
(5245   }) 34.9481 Tj
0 -465.1747 Td
(5246   wakeup\(&p->nread\);  ) 117.9499 Tj
0 -474.668 Td
(5247   release\(&p->lock\);) 109.2129 Tj
0 -484.1614 Td
(5248   return n;) 69.8962 Tj
0 -493.6547 Td
(5249 }) 26.2111 Tj
0 -522.1348 Td
(Sheet 52) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/pipe.c  Page 3) 161.635 Tj
0 -28.4801 Td
(5250 int) 34.9481 Tj
0 -37.9735 Td
(5251 piperead\(struct pipe *p, char *addr, int n\)) 209.6887 Tj
0 -47.4668 Td
(5252 {) 26.2111 Tj
0 -56.9602 Td
(5253   int i;) 56.7907 Tj
0 -66.4535 Td
(5254 ) 21.8426 Tj
0 -75.9469 Td
(5255   acquire\(&p->lock\);) 109.2129 Tj
0 -85.4403 Td
(5256   while\(p->nread == p->nwrite && p->writeopen\){  ) 235.8998 Tj
0 -94.9336 Td
(5257     if\(cp->killed\){) 104.8443 Tj
0 -104.427 Td
(5258       release\(&p->lock\);) 126.6869 Tj
0 -113.9203 Td
(5259       return -1;) 91.7388 Tj
0 -123.4137 Td
(5260     }) 43.6851 Tj
0 -132.9071 Td
(5261     sleep\(&p->nread, &p->lock\); ) 161.635 Tj
0 -142.4004 Td
(5262   }) 34.9481 Tj
0 -151.8938 Td
(5263   for\(i = 0; i < n; i++\){  ) 139.7925 Tj
0 -161.3871 Td
(5264     if\(p->nread == p->nwrite\)) 148.5295 Tj
0 -170.8805 Td
(5265       break;) 74.2647 Tj
0 -180.3739 Td
(5266     addr[i] = p->data[p->nread++ % PIPESIZE];) 218.4257 Tj
0 -189.8672 Td
(5267   }) 34.9481 Tj
0 -199.3606 Td
(5268   wakeup\(&p->nwrite\);  ) 122.3184 Tj
0 -208.8539 Td
(5269   release\(&p->lock\);) 109.2129 Tj
0 -218.3473 Td
(5270   return i;) 69.8962 Tj
0 -227.8407 Td
(5271 }) 26.2111 Tj
0 -237.334 Td
(5272 ) 21.8426 Tj
0 -246.8274 Td
(5273 ) 21.8426 Tj
0 -256.3207 Td
(5274 ) 21.8426 Tj
0 -265.8141 Td
(5275 ) 21.8426 Tj
0 -275.3075 Td
(5276 ) 21.8426 Tj
0 -284.8008 Td
(5277 ) 21.8426 Tj
0 -294.2942 Td
(5278 ) 21.8426 Tj
0 -303.7875 Td
(5279 ) 21.8426 Tj
0 -313.2809 Td
(5280 ) 21.8426 Tj
0 -322.7743 Td
(5281 ) 21.8426 Tj
0 -332.2676 Td
(5282 ) 21.8426 Tj
0 -341.761 Td
(5283 ) 21.8426 Tj
0 -351.2543 Td
(5284 ) 21.8426 Tj
0 -360.7477 Td
(5285 ) 21.8426 Tj
0 -370.2411 Td
(5286 ) 21.8426 Tj
0 -379.7344 Td
(5287 ) 21.8426 Tj
0 -389.2278 Td
(5288 ) 21.8426 Tj
0 -398.7211 Td
(5289 ) 21.8426 Tj
0 -408.2145 Td
(5290 ) 21.8426 Tj
0 -417.7079 Td
(5291 ) 21.8426 Tj
0 -427.2012 Td
(5292 ) 21.8426 Tj
0 -436.6946 Td
(5293 ) 21.8426 Tj
0 -446.1879 Td
(5294 ) 21.8426 Tj
0 -455.6813 Td
(5295 ) 21.8426 Tj
0 -465.1747 Td
(5296 ) 21.8426 Tj
0 -474.668 Td
(5297 ) 21.8426 Tj
0 -484.1614 Td
(5298 ) 21.8426 Tj
0 -493.6547 Td
(5299 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 52) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 60 60
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/string.c  Page 1) 170.3721 Tj
0 -28.4801 Td
(5300 #include "types.h") 100.4758 Tj
0 -37.9735 Td
(5301 #include "x86.h") 91.7388 Tj
0 -47.4668 Td
(5302 ) 21.8426 Tj
0 -56.9602 Td
(5303 void*) 43.6851 Tj
0 -66.4535 Td
(5304 memset\(void *dst, int c, uint n\)) 161.635 Tj
0 -75.9469 Td
(5305 {) 26.2111 Tj
0 -85.4403 Td
(5306   stosb\(dst, c, n\);) 104.8443 Tj
0 -94.9336 Td
(5307   return dst;) 78.6333 Tj
0 -104.427 Td
(5308 }) 26.2111 Tj
0 -113.9203 Td
(5309 ) 21.8426 Tj
0 -123.4137 Td
(5310 int) 34.9481 Tj
0 -132.9071 Td
(5311 memcmp\(const void *v1, const void *v2, uint n\)) 222.7942 Tj
0 -142.4004 Td
(5312 {) 26.2111 Tj
0 -151.8938 Td
(5313   const uchar *s1, *s2;) 122.3184 Tj
0 -161.3871 Td
(5314 ) 21.8426 Tj
0 -170.8805 Td
(5315   s1 = v1;) 65.5277 Tj
0 -180.3739 Td
(5316   s2 = v2;) 65.5277 Tj
0 -189.8672 Td
(5317   while\(n-- > 0\){) 96.1073 Tj
0 -199.3606 Td
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(5400 // See MultiProcessor Specification Version 1.[14]) 240.2683 Tj
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(5426 };) 30.5796 Tj
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(5500 // Multiprocessor bootstrap.) 144.161 Tj
0 -37.9735 Td
(5501 // Search memory for MP description structures.) 227.1628 Tj
0 -47.4668 Td
(5502 // http://developer.intel.com/design/pentium/datashts/2420\
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0 -56.9602 Td
(5503 ) 21.8426 Tj
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(5504 #include "types.h") 100.4758 Tj
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(5544       return \(struct mp*\)p;) 139.7925 Tj
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(5545   return 0;) 69.8962 Tj
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(Aug  8 01:04 2009  xv6/mp.c  Page 2) 152.898 Tj
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(5550 // Search for the MP Floating Pointer Structure, which acc\
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0 -37.9735 Td
(5551 // spec is in one of the following three locations:) 244.6368 Tj
0 -47.4668 Td
(5552 // 1\) in the first KB of the EBDA;) 170.3721 Tj
0 -56.9602 Td
(5553 // 2\) in the last KB of system base memory;) 209.6887 Tj
0 -66.4535 Td
(5554 // 3\) in the BIOS ROM between 0xE0000 and 0xFFFFF.) 240.2683 Tj
0 -75.9469 Td
(5555 static struct mp*) 96.1073 Tj
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(5556 mpsearch\(void\)) 83.0018 Tj
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(5558   uchar *bda;) 78.6333 Tj
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0 -132.9071 Td
(5561 ) 21.8426 Tj
0 -142.4004 Td
(5562   bda = \(uchar*\)0x400;) 117.9499 Tj
0 -151.8938 Td
(5563   if\(\(p = \(\(bda[0x0F]<<8\)|bda[0x0E]\) << 4\)\){) 214.0572 Tj
0 -161.3871 Td
(5564     if\(\(mp = mpsearch1\(\(uchar*\)p, 1024\)\)\)) 200.9517 Tj
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(5565       return mp;) 91.7388 Tj
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(5566   } else {) 65.5277 Tj
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(5567     p = \(\(bda[0x14]<<8\)|bda[0x13]\)*1024;) 196.5831 Tj
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0 -208.8539 Td
(5569       return mp;) 91.7388 Tj
0 -218.3473 Td
(5570   }) 34.9481 Tj
0 -227.8407 Td
(5571   return mpsearch1\(\(uchar*\)0xF0000, 0x10000\);) 218.4257 Tj
0 -237.334 Td
(5572 }) 26.2111 Tj
0 -246.8274 Td
(5573 ) 21.8426 Tj
0 -256.3207 Td
(5574 // Search for an MP configuration table.  For now,) 240.2683 Tj
0 -265.8141 Td
(5575 // don't accept the default configurations \(physaddr == 0\
\).) 279.5849 Tj
0 -275.3075 Td
(5576 // Check for correct signature, calculate the checksum and\
,) 279.5849 Tj
0 -284.8008 Td
(5577 // if correct, check the version.) 166.0035 Tj
0 -294.2942 Td
(5578 // To do: check extended table checksum.) 196.5831 Tj
0 -303.7875 Td
(5579 static struct mpconf*) 113.5814 Tj
0 -313.2809 Td
(5580 mpconfig\(struct mp **pmp\)) 131.0554 Tj
0 -322.7743 Td
(5581 {) 26.2111 Tj
0 -332.2676 Td
(5582   struct mpconf *conf;) 117.9499 Tj
0 -341.761 Td
(5583   struct mp *mp;) 91.7388 Tj
0 -351.2543 Td
(5584 ) 21.8426 Tj
0 -360.7477 Td
(5585   if\(\(mp = mpsearch\(\)\) == 0 || mp->physaddr == 0\)) 235.8998 Tj
0 -370.2411 Td
(5586     return 0;) 78.6333 Tj
0 -379.7344 Td
(5587   conf = \(struct mpconf*\)mp->physaddr;) 187.8461 Tj
0 -389.2278 Td
(5588   if\(memcmp\(conf, "PCMP", 4\) != 0\)) 170.3721 Tj
0 -398.7211 Td
(5589     return 0;) 78.6333 Tj
0 -408.2145 Td
(5590   if\(conf->version != 1 && conf->version != 4\)) 222.7942 Tj
0 -417.7079 Td
(5591     return 0;) 78.6333 Tj
0 -427.2012 Td
(5592   if\(sum\(\(uchar*\)conf, conf->length\) != 0\)) 205.3202 Tj
0 -436.6946 Td
(5593     return 0;) 78.6333 Tj
0 -446.1879 Td
(5594   *pmp = mp;) 74.2647 Tj
0 -455.6813 Td
(5595   return conf;) 83.0018 Tj
0 -465.1747 Td
(5596 }) 26.2111 Tj
0 -474.668 Td
(5597 ) 21.8426 Tj
0 -484.1614 Td
(5598 ) 21.8426 Tj
0 -493.6547 Td
(5599 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 55) 34.9481 Tj
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[] 0 d
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0 0 612 792 re
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q
180 3960 5760 3460 re
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[10 0 0 10 0 0] cm
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0 0 Td
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0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/mp.c  Page 3) 152.898 Tj
0 -28.4801 Td
(5600 void) 39.3166 Tj
0 -37.9735 Td
(5601 mpinit\(void\)) 74.2647 Tj
0 -47.4668 Td
(5602 {) 26.2111 Tj
0 -56.9602 Td
(5603   uchar *p, *e;) 87.3703 Tj
0 -66.4535 Td
(5604   struct mp *mp;) 91.7388 Tj
0 -75.9469 Td
(5605   struct mpconf *conf;) 117.9499 Tj
0 -85.4403 Td
(5606   struct mpproc *proc;) 117.9499 Tj
0 -94.9336 Td
(5607   struct mpioapic *ioapic;) 135.4239 Tj
0 -104.427 Td
(5608 ) 21.8426 Tj
0 -113.9203 Td
(5609   bcpu = &cpus[ncpu];) 113.5814 Tj
0 -123.4137 Td
(5610   if\(\(conf = mpconfig\(&mp\)\) == 0\)) 166.0035 Tj
0 -132.9071 Td
(5611     return;) 69.8962 Tj
0 -142.4004 Td
(5612 ) 21.8426 Tj
0 -151.8938 Td
(5613   ismp = 1;) 69.8962 Tj
0 -161.3871 Td
(5614   lapic = \(uint*\)conf->lapicaddr;) 166.0035 Tj
0 -170.8805 Td
(5615 ) 21.8426 Tj
0 -180.3739 Td
(5616   for\(p=\(uchar*\)\(conf+1\), e=\(uchar*\)conf+conf->leng\
th; p<e; \){) 292.6905 Tj
0 -189.8672 Td
(5617     switch\(*p\){) 87.3703 Tj
0 -199.3606 Td
(5618     case MPPROC:) 91.7388 Tj
0 -208.8539 Td
(5619       proc = \(struct mpproc*\)p;) 157.2665 Tj
0 -218.3473 Td
(5620       cpus[ncpu].apicid = proc->apicid;) 192.2146 Tj
0 -227.8407 Td
(5621       if\(proc->flags & MPBOOT\)) 152.898 Tj
0 -237.334 Td
(5622         bcpu = &cpus[ncpu];) 139.7925 Tj
0 -246.8274 Td
(5623       ncpu++;) 78.6333 Tj
0 -256.3207 Td
(5624       p += sizeof\(struct mpproc\);) 166.0035 Tj
0 -265.8141 Td
(5625       continue;) 87.3703 Tj
0 -275.3075 Td
(5626     case MPIOAPIC:) 100.4758 Tj
0 -284.8008 Td
(5627       ioapic = \(struct mpioapic*\)p;) 174.7406 Tj
0 -294.2942 Td
(5628       ioapicid = ioapic->apicno;) 161.635 Tj
0 -303.7875 Td
(5629       p += sizeof\(struct mpioapic\);) 174.7406 Tj
0 -313.2809 Td
(5630       continue;) 87.3703 Tj
0 -322.7743 Td
(5631     case MPBUS:) 87.3703 Tj
0 -332.2676 Td
(5632     case MPIOINTR:) 100.4758 Tj
0 -341.761 Td
(5633     case MPLINTR:) 96.1073 Tj
0 -351.2543 Td
(5634       p += 8;) 78.6333 Tj
0 -360.7477 Td
(5635       continue;) 87.3703 Tj
0 -370.2411 Td
(5636     default:) 74.2647 Tj
0 -379.7344 Td
(5637       cprintf\("mpinit: unknown config type %x\\n", *p\);) 257.7424 Tj
0 -389.2278 Td
(5638       panic\("mpinit"\);) 117.9499 Tj
0 -398.7211 Td
(5639     }) 43.6851 Tj
0 -408.2145 Td
(5640   }) 34.9481 Tj
0 -417.7079 Td
(5641 ) 21.8426 Tj
0 -427.2012 Td
(5642   if\(mp->imcrp\){) 91.7388 Tj
0 -436.6946 Td
(5643     // Bochs doesn't support IMCR, so this doesn't run on \
Bochs.) 301.4275 Tj
0 -446.1879 Td
(5644     // But it would on real hardware.) 183.4776 Tj
0 -455.6813 Td
(5645     outb\(0x22, 0x70\);   // Select IMCR) 187.8461 Tj
0 -465.1747 Td
(5646     outb\(0x23, inb\(0x23\) | 1\);  // Mask external inter\
rupts.) 283.9534 Tj
0 -474.668 Td
(5647   }) 34.9481 Tj
0 -484.1614 Td
(5648 }) 26.2111 Tj
0 -493.6547 Td
(5649 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 56) 34.9481 Tj
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180 500 5760 3460 re
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/DeviceGray {} CS
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[0] sc
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[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/lapic.c  Page 1) 166.0035 Tj
0 -28.4801 Td
(5650 // The local APIC manages internal \(non-I/O\) interrupts.) 266.4794 Tj
0 -37.9735 Td
(5651 // See Chapter 8 & Appendix C of Intel processor manual vo\
lume 3.) 305.796 Tj
0 -47.4668 Td
(5652 ) 21.8426 Tj
0 -56.9602 Td
(5653 #include "types.h") 100.4758 Tj
0 -66.4535 Td
(5654 #include "defs.h") 96.1073 Tj
0 -75.9469 Td
(5655 #include "traps.h") 100.4758 Tj
0 -85.4403 Td
(5656 #include "mmu.h") 91.7388 Tj
0 -94.9336 Td
(5657 #include "x86.h") 91.7388 Tj
0 -104.427 Td
(5658 ) 21.8426 Tj
0 -113.9203 Td
(5659 // Local APIC registers, divided by 4 for use as uint[] in\
dices.) 301.4275 Tj
0 -123.4137 Td
(5660 #define ID      \(0x0020/4\)   // ID) 170.3721 Tj
0 -132.9071 Td
(5661 #define VER     \(0x0030/4\)   // Version) 192.2146 Tj
0 -142.4004 Td
(5662 #define TPR     \(0x0080/4\)   // Task Priority) 218.4257 Tj
0 -151.8938 Td
(5663 #define EOI     \(0x00B0/4\)   // EOI) 174.7406 Tj
0 -161.3871 Td
(5664 #define SVR     \(0x00F0/4\)   // Spurious Interrupt Vecto\
r) 270.8479 Tj
0 -170.8805 Td
(5665   #define ENABLE     0x00000100   // Unit Enable) 231.5313 Tj
0 -180.3739 Td
(5666 #define ESR     \(0x0280/4\)   // Error Status) 214.0572 Tj
0 -189.8672 Td
(5667 #define ICRLO   \(0x0300/4\)   // Interrupt Command) 235.8998 Tj
0 -199.3606 Td
(5668   #define INIT       0x00000500   // INIT/RESET) 227.1628 Tj
0 -208.8539 Td
(5669   #define STARTUP    0x00000600   // Startup IPI) 231.5313 Tj
0 -218.3473 Td
(5670   #define DELIVS     0x00001000   // Delivery status) 249.0053 Tj
0 -227.8407 Td
(5671   #define ASSERT     0x00004000   // Assert interrupt \(vs\
 deassert\)) 314.533 Tj
0 -237.334 Td
(5672   #define LEVEL      0x00008000   // Level triggered) 249.0053 Tj
0 -246.8274 Td
(5673   #define BCAST      0x00080000   // Send to all APICs, in\
cluding self.) 332.0071 Tj
0 -256.3207 Td
(5674 #define ICRHI   \(0x0310/4\)   // Interrupt Command [63:32\
]) 270.8479 Tj
0 -265.8141 Td
(5675 #define TIMER   \(0x0320/4\)   // Local Vector Table 0 \(T\
IMER\)) 283.9534 Tj
0 -275.3075 Td
(5676   #define X1         0x0000000B   // divide counts by 1) 262.1109 Tj
0 -284.8008 Td
(5677   #define PERIODIC   0x00020000   // Periodic) 218.4257 Tj
0 -294.2942 Td
(5678 #define PCINT   \(0x0340/4\)   // Performance Counter LVT) 262.1109 Tj
0 -303.7875 Td
(5679 #define LINT0   \(0x0350/4\)   // Local Vector Table 1 \(L\
INT0\)) 283.9534 Tj
0 -313.2809 Td
(5680 #define LINT1   \(0x0360/4\)   // Local Vector Table 2 \(L\
INT1\)) 283.9534 Tj
0 -322.7743 Td
(5681 #define ERROR   \(0x0370/4\)   // Local Vector Table 3 \(E\
RROR\)) 283.9534 Tj
0 -332.2676 Td
(5682   #define MASKED     0x00010000   // Interrupt masked) 253.3738 Tj
0 -341.761 Td
(5683 #define TICR    \(0x0380/4\)   // Timer Initial Count) 244.6368 Tj
0 -351.2543 Td
(5684 #define TCCR    \(0x0390/4\)   // Timer Current Count) 244.6368 Tj
0 -360.7477 Td
(5685 #define TDCR    \(0x03E0/4\)   // Timer Divide Configurati\
on) 275.2164 Tj
0 -370.2411 Td
(5686 ) 21.8426 Tj
0 -379.7344 Td
(5687 volatile uint *lapic;  // Initialized in mp.c) 218.4257 Tj
0 -389.2278 Td
(5688 ) 21.8426 Tj
0 -398.7211 Td
(5689 static void) 69.8962 Tj
0 -408.2145 Td
(5690 lapicw\(int index, int value\)) 144.161 Tj
0 -417.7079 Td
(5691 {) 26.2111 Tj
0 -427.2012 Td
(5692   lapic[index] = value;) 122.3184 Tj
0 -436.6946 Td
(5693   lapic[ID];  // wait for write to finish, by reading) 253.3738 Tj
0 -446.1879 Td
(5694 }) 26.2111 Tj
0 -455.6813 Td
(5695 ) 21.8426 Tj
0 -465.1747 Td
(5696 ) 21.8426 Tj
0 -474.668 Td
(5697 ) 21.8426 Tj
0 -484.1614 Td
(5698 ) 21.8426 Tj
0 -493.6547 Td
(5699 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 56) 34.9481 Tj
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0 0 612 792 re W
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[] 0 d
1 i
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1 w
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/DeviceGray {} CS
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0 0 612 792 re
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[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
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[10 0 0 10 0 0] cm
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0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/lapic.c  Page 2) 166.0035 Tj
0 -28.4801 Td
(5700 void) 39.3166 Tj
0 -37.9735 Td
(5701 lapicinit\(int c\)) 91.7388 Tj
0 -47.4668 Td
(5702 {) 26.2111 Tj
0 -56.9602 Td
(5703   if\(!lapic\)) 74.2647 Tj
0 -66.4535 Td
(5704     return;) 69.8962 Tj
0 -75.9469 Td
(5705 ) 21.8426 Tj
0 -85.4403 Td
(5706   // Enable local APIC; set spurious interrupt vector.) 257.7424 Tj
0 -94.9336 Td
(5707   lapicw\(SVR, ENABLE | \(T_IRQ0 + IRQ_SPURIOUS\)\);) 231.5313 Tj
0 -104.427 Td
(5708 ) 21.8426 Tj
0 -113.9203 Td
(5709   // The timer repeatedly counts down at bus frequency) 257.7424 Tj
0 -123.4137 Td
(5710   // from lapic[TICR] and then issues an interrupt.) 244.6368 Tj
0 -132.9071 Td
(5711   // If xv6 cared more about precise timekeeping,) 235.8998 Tj
0 -142.4004 Td
(5712   // TICR would be calibrated using an external time sourc\
e.) 283.9534 Tj
0 -151.8938 Td
(5713   lapicw\(TDCR, X1\);) 104.8443 Tj
0 -161.3871 Td
(5714   lapicw\(TIMER, PERIODIC | \(T_IRQ0 + IRQ_TIMER\)\);) 235.8998 Tj
0 -170.8805 Td
(5715   lapicw\(TICR, 10000000\);) 131.0554 Tj
0 -180.3739 Td
(5716 ) 21.8426 Tj
0 -189.8672 Td
(5717   // Disable logical interrupt lines.) 183.4776 Tj
0 -199.3606 Td
(5718   lapicw\(LINT0, MASKED\);) 126.6869 Tj
0 -208.8539 Td
(5719   lapicw\(LINT1, MASKED\);) 126.6869 Tj
0 -218.3473 Td
(5720 ) 21.8426 Tj
0 -227.8407 Td
(5721   // Disable performance counter overflow interrupts) 249.0053 Tj
0 -237.334 Td
(5722   // on machines that provide that interrupt entry.) 244.6368 Tj
0 -246.8274 Td
(5723   if\(\(\(lapic[VER]>>16\) & 0xFF\) >= 4\)) 179.1091 Tj
0 -256.3207 Td
(5724     lapicw\(PCINT, MASKED\);) 135.4239 Tj
0 -265.8141 Td
(5725 ) 21.8426 Tj
0 -275.3075 Td
(5726   // Map error interrupt to IRQ_ERROR.) 187.8461 Tj
0 -284.8008 Td
(5727   lapicw\(ERROR, T_IRQ0 + IRQ_ERROR\);) 179.1091 Tj
0 -294.2942 Td
(5728 ) 21.8426 Tj
0 -303.7875 Td
(5729   // Clear error status register \(requires back-to-back w\
rites\).) 301.4275 Tj
0 -313.2809 Td
(5730   lapicw\(ESR, 0\);) 96.1073 Tj
0 -322.7743 Td
(5731   lapicw\(ESR, 0\);) 96.1073 Tj
0 -332.2676 Td
(5732 ) 21.8426 Tj
0 -341.761 Td
(5733   // Ack any outstanding interrupts.) 179.1091 Tj
0 -351.2543 Td
(5734   lapicw\(EOI, 0\);) 96.1073 Tj
0 -360.7477 Td
(5735 ) 21.8426 Tj
0 -370.2411 Td
(5736   // Send an Init Level De-Assert to synchronise arbitrati\
on ID's.) 310.1645 Tj
0 -379.7344 Td
(5737   lapicw\(ICRHI, 0\);) 104.8443 Tj
0 -389.2278 Td
(5738   lapicw\(ICRLO, BCAST | INIT | LEVEL\);) 187.8461 Tj
0 -398.7211 Td
(5739   while\(lapic[ICRLO] & DELIVS\)) 152.898 Tj
0 -408.2145 Td
(5740     ;) 43.6851 Tj
0 -417.7079 Td
(5741 ) 21.8426 Tj
0 -427.2012 Td
(5742   // Enable interrupts on the APIC \(but not on the proces\
sor\).) 292.6905 Tj
0 -436.6946 Td
(5743   lapicw\(TPR, 0\);) 96.1073 Tj
0 -446.1879 Td
(5744 }) 26.2111 Tj
0 -455.6813 Td
(5745 ) 21.8426 Tj
0 -465.1747 Td
(5746 ) 21.8426 Tj
0 -474.668 Td
(5747 ) 21.8426 Tj
0 -484.1614 Td
(5748 ) 21.8426 Tj
0 -493.6547 Td
(5749 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 57) 34.9481 Tj
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Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/lapic.c  Page 3) 166.0035 Tj
0 -28.4801 Td
(5750 int) 34.9481 Tj
0 -37.9735 Td
(5751 cpu\(void\)) 61.1592 Tj
0 -47.4668 Td
(5752 {) 26.2111 Tj
0 -56.9602 Td
(5753   // Cannot call cpu when interrupts are enabled:) 235.8998 Tj
0 -66.4535 Td
(5754   // result not guaranteed to last long enough to be used!) 275.2164 Tj
0 -75.9469 Td
(5755   // Would prefer to panic but even printing is chancy her\
e:) 283.9534 Tj
0 -85.4403 Td
(5756   // almost everything, including cprintf and panic, calls\
 cpu,) 297.059 Tj
0 -94.9336 Td
(5757   // often indirectly through acquire and release.) 240.2683 Tj
0 -104.427 Td
(5758   if\(readeflags\(\)&FL_IF\){) 131.0554 Tj
0 -113.9203 Td
(5759     static int n;) 96.1073 Tj
0 -123.4137 Td
(5760     if\(n++ == 0\)) 91.7388 Tj
0 -132.9071 Td
(5761       cprintf\("cpu called from %x with interrupts enabled\
\\n",) 288.322 Tj
0 -142.4004 Td
(5762         __builtin_return_address\(0\)\);) 183.4776 Tj
0 -151.8938 Td
(5763   }) 34.9481 Tj
0 -161.3871 Td
(5764 ) 21.8426 Tj
0 -170.8805 Td
(5765   if\(lapic\)) 69.8962 Tj
0 -180.3739 Td
(5766     return lapic[ID]>>24;) 131.0554 Tj
0 -189.8672 Td
(5767   return 0;) 69.8962 Tj
0 -199.3606 Td
(5768 }) 26.2111 Tj
0 -208.8539 Td
(5769 ) 21.8426 Tj
0 -218.3473 Td
(5770 // Acknowledge interrupt.) 131.0554 Tj
0 -227.8407 Td
(5771 void) 39.3166 Tj
0 -237.334 Td
(5772 lapiceoi\(void\)) 83.0018 Tj
0 -246.8274 Td
(5773 {) 26.2111 Tj
0 -256.3207 Td
(5774   if\(lapic\)) 69.8962 Tj
0 -265.8141 Td
(5775     lapicw\(EOI, 0\);) 104.8443 Tj
0 -275.3075 Td
(5776 }) 26.2111 Tj
0 -284.8008 Td
(5777 ) 21.8426 Tj
0 -294.2942 Td
(5778 // Spin for a given number of microseconds.) 209.6887 Tj
0 -303.7875 Td
(5779 // On real hardware would want to tune this dynamically.) 266.4794 Tj
0 -313.2809 Td
(5780 void) 39.3166 Tj
0 -322.7743 Td
(5781 microdelay\(int us\)) 100.4758 Tj
0 -332.2676 Td
(5782 {) 26.2111 Tj
0 -341.761 Td
(5783   volatile int j = 0;) 113.5814 Tj
0 -351.2543 Td
(5784 ) 21.8426 Tj
0 -360.7477 Td
(5785   while\(us-- > 0\)) 96.1073 Tj
0 -370.2411 Td
(5786     for\(j=0; j<10000; j++\);) 139.7925 Tj
0 -379.7344 Td
(5787 }) 26.2111 Tj
0 -389.2278 Td
(5788 ) 21.8426 Tj
0 -398.7211 Td
(5789 ) 21.8426 Tj
0 -408.2145 Td
(5790 ) 21.8426 Tj
0 -417.7079 Td
(5791 ) 21.8426 Tj
0 -427.2012 Td
(5792 ) 21.8426 Tj
0 -436.6946 Td
(5793 ) 21.8426 Tj
0 -446.1879 Td
(5794 ) 21.8426 Tj
0 -455.6813 Td
(5795 ) 21.8426 Tj
0 -465.1747 Td
(5796 ) 21.8426 Tj
0 -474.668 Td
(5797 ) 21.8426 Tj
0 -484.1614 Td
(5798 ) 21.8426 Tj
0 -493.6547 Td
(5799 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 57) 34.9481 Tj
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[] 0 d
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[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/lapic.c  Page 4) 166.0035 Tj
0 -28.4801 Td
(5800 #define IO_RTC  0x70) 109.2129 Tj
0 -37.9735 Td
(5801 ) 21.8426 Tj
0 -47.4668 Td
(5802 // Start additional processor running bootstrap code at ad\
dr.) 288.322 Tj
0 -56.9602 Td
(5803 // See Appendix B of MultiProcessor Specification.) 240.2683 Tj
0 -66.4535 Td
(5804 void) 39.3166 Tj
0 -75.9469 Td
(5805 lapicstartap\(uchar apicid, uint addr\)) 183.4776 Tj
0 -85.4403 Td
(5806 {) 26.2111 Tj
0 -94.9336 Td
(5807   int i;) 56.7907 Tj
0 -104.427 Td
(5808   ushort *wrv;) 83.0018 Tj
0 -113.9203 Td
(5809 ) 21.8426 Tj
0 -123.4137 Td
(5810   // "The BSP must initialize CMOS shutdown code to 0AH) 262.1109 Tj
0 -132.9071 Td
(5811   // and the warm reset vector \(DWORD based at 40:67\) to\
 point at) 305.796 Tj
0 -142.4004 Td
(5812   // the AP startup code prior to the [universal startup a\
lgorithm].") 323.2701 Tj
0 -151.8938 Td
(5813   outb\(IO_RTC, 0xF\);  // offset 0xF is shutdown code) 249.0053 Tj
0 -161.3871 Td
(5814   outb\(IO_RTC+1, 0x0A\);) 122.3184 Tj
0 -170.8805 Td
(5815   wrv = \(ushort*\)\(0x40<<4 | 0x67\);  // Warm reset vect\
or) 266.4794 Tj
0 -180.3739 Td
(5816   wrv[0] = 0;) 78.6333 Tj
0 -189.8672 Td
(5817   wrv[1] = addr >> 4;) 113.5814 Tj
0 -199.3606 Td
(5818 ) 21.8426 Tj
0 -208.8539 Td
(5819   // "Universal startup algorithm.") 174.7406 Tj
0 -218.3473 Td
(5820   // Send INIT \(level-triggered\) interrupt to reset othe\
r CPU.) 292.6905 Tj
0 -227.8407 Td
(5821   lapicw\(ICRHI, apicid<<24\);) 144.161 Tj
0 -237.334 Td
(5822   lapicw\(ICRLO, INIT | LEVEL | ASSERT\);) 192.2146 Tj
0 -246.8274 Td
(5823   microdelay\(200\);) 100.4758 Tj
0 -256.3207 Td
(5824   lapicw\(ICRLO, INIT | LEVEL\);) 152.898 Tj
0 -265.8141 Td
(5825   microdelay\(100\);    // should be 10ms, but too slow in\
 Bochs!) 297.059 Tj
0 -275.3075 Td
(5826 ) 21.8426 Tj
0 -284.8008 Td
(5827   // Send startup IPI \(twice!\) to enter bootstrap code.) 262.1109 Tj
0 -294.2942 Td
(5828   // Regular hardware is supposed to only accept a STARTUP) 275.2164 Tj
0 -303.7875 Td
(5829   // when it is in the halted state due to an INIT.  So th\
e second) 310.1645 Tj
0 -313.2809 Td
(5830   // should be ignored, but it is part of the official Int\
el algorithm.) 332.0071 Tj
0 -322.7743 Td
(5831   // Bochs complains about the second one.  Too bad for Bo\
chs.) 292.6905 Tj
0 -332.2676 Td
(5832   for\(i = 0; i < 2; i++\){) 131.0554 Tj
0 -341.761 Td
(5833     lapicw\(ICRHI, apicid<<24\);) 152.898 Tj
0 -351.2543 Td
(5834     lapicw\(ICRLO, STARTUP | \(addr>>12\)\);) 196.5831 Tj
0 -360.7477 Td
(5835     microdelay\(200\);) 109.2129 Tj
0 -370.2411 Td
(5836   }) 34.9481 Tj
0 -379.7344 Td
(5837 }) 26.2111 Tj
0 -389.2278 Td
(5838 ) 21.8426 Tj
0 -398.7211 Td
(5839 ) 21.8426 Tj
0 -408.2145 Td
(5840 ) 21.8426 Tj
0 -417.7079 Td
(5841 ) 21.8426 Tj
0 -427.2012 Td
(5842 ) 21.8426 Tj
0 -436.6946 Td
(5843 ) 21.8426 Tj
0 -446.1879 Td
(5844 ) 21.8426 Tj
0 -455.6813 Td
(5845 ) 21.8426 Tj
0 -465.1747 Td
(5846 ) 21.8426 Tj
0 -474.668 Td
(5847 ) 21.8426 Tj
0 -484.1614 Td
(5848 ) 21.8426 Tj
0 -493.6547 Td
(5849 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 58) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/ioapic.c  Page 1) 170.3721 Tj
0 -28.4801 Td
(5850 // The I/O APIC manages hardware interrupts for an SMP sys\
tem.) 292.6905 Tj
0 -37.9735 Td
(5851 // http://www.intel.com/design/chipsets/datashts/29056601.\
pdf) 288.322 Tj
0 -47.4668 Td
(5852 // See also picirq.c.) 113.5814 Tj
0 -56.9602 Td
(5853 ) 21.8426 Tj
0 -66.4535 Td
(5854 #include "types.h") 100.4758 Tj
0 -75.9469 Td
(5855 #include "defs.h") 96.1073 Tj
0 -85.4403 Td
(5856 #include "traps.h") 100.4758 Tj
0 -94.9336 Td
(5857 ) 21.8426 Tj
0 -104.427 Td
(5858 #define IOAPIC  0xFEC00000   // Default physical address o\
f IO APIC) 314.533 Tj
0 -113.9203 Td
(5859 ) 21.8426 Tj
0 -123.4137 Td
(5860 #define REG_ID     0x00  // Register index: ID) 222.7942 Tj
0 -132.9071 Td
(5861 #define REG_VER    0x01  // Register index: version) 244.6368 Tj
0 -142.4004 Td
(5862 #define REG_TABLE  0x10  // Redirection table base) 240.2683 Tj
0 -151.8938 Td
(5863 ) 21.8426 Tj
0 -161.3871 Td
(5864 // The redirection table starts at REG_TABLE and uses) 253.3738 Tj
0 -170.8805 Td
(5865 // two registers to configure each interrupt.) 218.4257 Tj
0 -180.3739 Td
(5866 // The first \(low\) register in a pair contains configura\
tion bits.) 310.1645 Tj
0 -189.8672 Td
(5867 // The second \(high\) register contains a bitmask telling\
 which) 292.6905 Tj
0 -199.3606 Td
(5868 // CPUs can serve that interrupt.) 166.0035 Tj
0 -208.8539 Td
(5869 #define INT_DISABLED   0x00010000  // Interrupt disabled) 266.4794 Tj
0 -218.3473 Td
(5870 #define INT_LEVEL      0x00008000  // Level-triggered \(vs\
 edge-\)) 301.4275 Tj
0 -227.8407 Td
(5871 #define INT_ACTIVELOW  0x00002000  // Active low \(vs high\
\)) 275.2164 Tj
0 -237.334 Td
(5872 #define INT_LOGICAL    0x00000800  // Destination is CPU i\
d \(vs APIC ID\)) 336.3756 Tj
0 -246.8274 Td
(5873 ) 21.8426 Tj
0 -256.3207 Td
(5874 volatile struct ioapic *ioapic;) 157.2665 Tj
0 -265.8141 Td
(5875 ) 21.8426 Tj
0 -275.3075 Td
(5876 // IO APIC MMIO structure: write reg, then read or write d\
ata.) 292.6905 Tj
0 -284.8008 Td
(5877 struct ioapic {) 87.3703 Tj
0 -294.2942 Td
(5878   uint reg;) 69.8962 Tj
0 -303.7875 Td
(5879   uint pad[3];) 83.0018 Tj
0 -313.2809 Td
(5880   uint data;) 74.2647 Tj
0 -322.7743 Td
(5881 };) 30.5796 Tj
0 -332.2676 Td
(5882 ) 21.8426 Tj
0 -341.761 Td
(5883 static uint) 69.8962 Tj
0 -351.2543 Td
(5884 ioapicread\(int reg\)) 104.8443 Tj
0 -360.7477 Td
(5885 {) 26.2111 Tj
0 -370.2411 Td
(5886   ioapic->reg = reg;) 109.2129 Tj
0 -379.7344 Td
(5887   return ioapic->data;) 117.9499 Tj
0 -389.2278 Td
(5888 }) 26.2111 Tj
0 -398.7211 Td
(5889 ) 21.8426 Tj
0 -408.2145 Td
(5890 static void) 69.8962 Tj
0 -417.7079 Td
(5891 ioapicwrite\(int reg, uint data\)) 157.2665 Tj
0 -427.2012 Td
(5892 {) 26.2111 Tj
0 -436.6946 Td
(5893   ioapic->reg = reg;) 109.2129 Tj
0 -446.1879 Td
(5894   ioapic->data = data;) 117.9499 Tj
0 -455.6813 Td
(5895 }) 26.2111 Tj
0 -465.1747 Td
(5896 ) 21.8426 Tj
0 -474.668 Td
(5897 ) 21.8426 Tj
0 -484.1614 Td
(5898 ) 21.8426 Tj
0 -493.6547 Td
(5899 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 58) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 66 66
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/ioapic.c  Page 2) 170.3721 Tj
0 -28.4801 Td
(5900 void) 39.3166 Tj
0 -37.9735 Td
(5901 ioapicinit\(void\)) 91.7388 Tj
0 -47.4668 Td
(5902 {) 26.2111 Tj
0 -56.9602 Td
(5903   int i, id, maxintr;) 113.5814 Tj
0 -66.4535 Td
(5904 ) 21.8426 Tj
0 -75.9469 Td
(5905   if\(!ismp\)) 69.8962 Tj
0 -85.4403 Td
(5906     return;) 69.8962 Tj
0 -94.9336 Td
(5907 ) 21.8426 Tj
0 -104.427 Td
(5908   ioapic = \(volatile struct ioapic*\)IOAPIC;) 209.6887 Tj
0 -113.9203 Td
(5909   maxintr = \(ioapicread\(REG_VER\) >> 16\) & 0xFF;) 227.1628 Tj
0 -123.4137 Td
(5910   id = ioapicread\(REG_ID\) >> 24;) 161.635 Tj
0 -132.9071 Td
(5911   if\(id != ioapicid\)) 109.2129 Tj
0 -142.4004 Td
(5912     cprintf\("ioapicinit: id isn't equal to ioapicid; not \
a MP\\n"\);) 310.1645 Tj
0 -151.8938 Td
(5913 ) 21.8426 Tj
0 -161.3871 Td
(5914   // Mark all interrupts edge-triggered, active high, disa\
bled,) 297.059 Tj
0 -170.8805 Td
(5915   // and not routed to any CPUs.) 161.635 Tj
0 -180.3739 Td
(5916   for\(i = 0; i <= maxintr; i++\){) 161.635 Tj
0 -189.8672 Td
(5917     ioapicwrite\(REG_TABLE+2*i, INT_DISABLED | \(T_IRQ0 + \
i\)\);) 283.9534 Tj
0 -199.3606 Td
(5918     ioapicwrite\(REG_TABLE+2*i+1, 0\);) 179.1091 Tj
0 -208.8539 Td
(5919   }) 34.9481 Tj
0 -218.3473 Td
(5920 }) 26.2111 Tj
0 -227.8407 Td
(5921 ) 21.8426 Tj
0 -237.334 Td
(5922 void) 39.3166 Tj
0 -246.8274 Td
(5923 ioapicenable\(int irq, int cpunum\)) 166.0035 Tj
0 -256.3207 Td
(5924 {) 26.2111 Tj
0 -265.8141 Td
(5925   if\(!ismp\)) 69.8962 Tj
0 -275.3075 Td
(5926     return;) 69.8962 Tj
0 -284.8008 Td
(5927 ) 21.8426 Tj
0 -294.2942 Td
(5928   // Mark interrupt edge-triggered, active high,) 231.5313 Tj
0 -303.7875 Td
(5929   // enabled, and routed to the given cpunum,) 218.4257 Tj
0 -313.2809 Td
(5930   // which happens to be that cpu's APIC ID.) 214.0572 Tj
0 -322.7743 Td
(5931   ioapicwrite\(REG_TABLE+2*irq, T_IRQ0 + irq\);) 218.4257 Tj
0 -332.2676 Td
(5932   ioapicwrite\(REG_TABLE+2*irq+1, cpunum << 24\);) 227.1628 Tj
0 -341.761 Td
(5933 }) 26.2111 Tj
0 -351.2543 Td
(5934 ) 21.8426 Tj
0 -360.7477 Td
(5935 ) 21.8426 Tj
0 -370.2411 Td
(5936 ) 21.8426 Tj
0 -379.7344 Td
(5937 ) 21.8426 Tj
0 -389.2278 Td
(5938 ) 21.8426 Tj
0 -398.7211 Td
(5939 ) 21.8426 Tj
0 -408.2145 Td
(5940 ) 21.8426 Tj
0 -417.7079 Td
(5941 ) 21.8426 Tj
0 -427.2012 Td
(5942 ) 21.8426 Tj
0 -436.6946 Td
(5943 ) 21.8426 Tj
0 -446.1879 Td
(5944 ) 21.8426 Tj
0 -455.6813 Td
(5945 ) 21.8426 Tj
0 -465.1747 Td
(5946 ) 21.8426 Tj
0 -474.668 Td
(5947 ) 21.8426 Tj
0 -484.1614 Td
(5948 ) 21.8426 Tj
0 -493.6547 Td
(5949 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 59) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/picirq.c  Page 1) 170.3721 Tj
0 -28.4801 Td
(5950 // Intel 8259A programmable interrupt controllers.) 240.2683 Tj
0 -37.9735 Td
(5951 ) 21.8426 Tj
0 -47.4668 Td
(5952 #include "types.h") 100.4758 Tj
0 -56.9602 Td
(5953 #include "x86.h") 91.7388 Tj
0 -66.4535 Td
(5954 #include "traps.h") 100.4758 Tj
0 -75.9469 Td
(5955 ) 21.8426 Tj
0 -85.4403 Td
(5956 // I/O Addresses of the two programmable interrupt control\
lers) 292.6905 Tj
0 -94.9336 Td
(5957 #define IO_PIC1         0x20    // Master \(IRQs 0-7\)) 249.0053 Tj
0 -104.427 Td
(5958 #define IO_PIC2         0xA0    // Slave \(IRQs 8-15\)) 249.0053 Tj
0 -113.9203 Td
(5959 ) 21.8426 Tj
0 -123.4137 Td
(5960 #define IRQ_SLAVE       2       // IRQ at which slave conn\
ects to master) 336.3756 Tj
0 -132.9071 Td
(5961 ) 21.8426 Tj
0 -142.4004 Td
(5962 // Current IRQ mask.) 109.2129 Tj
0 -151.8938 Td
(5963 // Initial IRQ mask has interrupt 2 enabled \(for slave 82\
59A\).) 292.6905 Tj
0 -161.3871 Td
(5964 static ushort irqmask = 0xFFFF & ~\(1<<IRQ_SLAVE\);) 235.8998 Tj
0 -170.8805 Td
(5965 ) 21.8426 Tj
0 -180.3739 Td
(5966 static void) 69.8962 Tj
0 -189.8672 Td
(5967 picsetmask\(ushort mask\)) 122.3184 Tj
0 -199.3606 Td
(5968 {) 26.2111 Tj
0 -208.8539 Td
(5969   irqmask = mask;) 96.1073 Tj
0 -218.3473 Td
(5970   outb\(IO_PIC1+1, mask\);) 126.6869 Tj
0 -227.8407 Td
(5971   outb\(IO_PIC2+1, mask >> 8\);) 148.5295 Tj
0 -237.334 Td
(5972 }) 26.2111 Tj
0 -246.8274 Td
(5973 ) 21.8426 Tj
0 -256.3207 Td
(5974 void) 39.3166 Tj
0 -265.8141 Td
(5975 picenable\(int irq\)) 100.4758 Tj
0 -275.3075 Td
(5976 {) 26.2111 Tj
0 -284.8008 Td
(5977   picsetmask\(irqmask & ~\(1<<irq\)\);) 170.3721 Tj
0 -294.2942 Td
(5978 }) 26.2111 Tj
0 -303.7875 Td
(5979 ) 21.8426 Tj
0 -313.2809 Td
(5980 // Initialize the 8259A interrupt controllers.) 222.7942 Tj
0 -322.7743 Td
(5981 void) 39.3166 Tj
0 -332.2676 Td
(5982 picinit\(void\)) 78.6333 Tj
0 -341.761 Td
(5983 {) 26.2111 Tj
0 -351.2543 Td
(5984   // mask all interrupts) 126.6869 Tj
0 -360.7477 Td
(5985   outb\(IO_PIC1+1, 0xFF\);) 126.6869 Tj
0 -370.2411 Td
(5986   outb\(IO_PIC2+1, 0xFF\);) 126.6869 Tj
0 -379.7344 Td
(5987 ) 21.8426 Tj
0 -389.2278 Td
(5988   // Set up master \(8259A-1\)) 144.161 Tj
0 -398.7211 Td
(5989 ) 21.8426 Tj
0 -408.2145 Td
(5990   // ICW1:  0001g0hi) 109.2129 Tj
0 -417.7079 Td
(5991   //    g:  0 = edge triggering, 1 = level triggering) 253.3738 Tj
0 -427.2012 Td
(5992   //    h:  0 = cascaded PICs, 1 = master only) 222.7942 Tj
0 -436.6946 Td
(5993   //    i:  0 = no ICW4, 1 = ICW4 required) 205.3202 Tj
0 -446.1879 Td
(5994   outb\(IO_PIC1, 0x11\);) 117.9499 Tj
0 -455.6813 Td
(5995 ) 21.8426 Tj
0 -465.1747 Td
(5996   // ICW2:  Vector offset) 131.0554 Tj
0 -474.668 Td
(5997   outb\(IO_PIC1+1, T_IRQ0\);) 135.4239 Tj
0 -484.1614 Td
(5998 ) 21.8426 Tj
0 -493.6547 Td
(5999 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 59) 34.9481 Tj
Q
Q
Q
Q
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%%PageTrailer
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%%Page: 67 67
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/picirq.c  Page 2) 170.3721 Tj
0 -28.4801 Td
(6000   // ICW3:  \(master PIC\) bit mask of IR lines connected \
to slaves) 305.796 Tj
0 -37.9735 Td
(6001   //        \(slave PIC\) 3-bit # of slave's connection to\
 master) 297.059 Tj
0 -47.4668 Td
(6002   outb\(IO_PIC1+1, 1<<IRQ_SLAVE\);) 161.635 Tj
0 -56.9602 Td
(6003 ) 21.8426 Tj
0 -66.4535 Td
(6004   // ICW4:  000nbmap) 109.2129 Tj
0 -75.9469 Td
(6005   //    n:  1 = special fully nested mode) 200.9517 Tj
0 -85.4403 Td
(6006   //    b:  1 = buffered mode) 148.5295 Tj
0 -94.9336 Td
(6007   //    m:  0 = slave PIC, 1 = master PIC) 200.9517 Tj
0 -104.427 Td
(6008   //      \(ignored when b is 0, as the master/slave role) 266.4794 Tj
0 -113.9203 Td
(6009   //      can be hardwired\).) 144.161 Tj
0 -123.4137 Td
(6010   //    a:  1 = Automatic EOI mode) 170.3721 Tj
0 -132.9071 Td
(6011   //    p:  0 = MCS-80/85 mode, 1 = intel x86 mode) 240.2683 Tj
0 -142.4004 Td
(6012   outb\(IO_PIC1+1, 0x3\);) 122.3184 Tj
0 -151.8938 Td
(6013 ) 21.8426 Tj
0 -161.3871 Td
(6014   // Set up slave \(8259A-2\)) 139.7925 Tj
0 -170.8805 Td
(6015   outb\(IO_PIC2, 0x11\);                  // ICW1) 227.1628 Tj
0 -180.3739 Td
(6016   outb\(IO_PIC2+1, T_IRQ0 + 8\);      // ICW2) 209.6887 Tj
0 -189.8672 Td
(6017   outb\(IO_PIC2+1, IRQ_SLAVE\);           // ICW3) 227.1628 Tj
0 -199.3606 Td
(6018   // NB Automatic EOI mode doesn't tend to work on the sla\
ve.) 288.322 Tj
0 -208.8539 Td
(6019   // Linux source code says it's "to be investigated".) 257.7424 Tj
0 -218.3473 Td
(6020   outb\(IO_PIC2+1, 0x3\);                 // ICW4) 227.1628 Tj
0 -227.8407 Td
(6021 ) 21.8426 Tj
0 -237.334 Td
(6022   // OCW3:  0ef01prs) 109.2129 Tj
0 -246.8274 Td
(6023   //   ef:  0x = NOP, 10 = clear specific mask, 11 = set s\
pecific mask) 327.6386 Tj
0 -256.3207 Td
(6024   //    p:  0 = no polling, 1 = polling mode) 214.0572 Tj
0 -265.8141 Td
(6025   //   rs:  0x = NOP, 10 = read IRR, 11 = read ISR) 240.2683 Tj
0 -275.3075 Td
(6026   outb\(IO_PIC1, 0x68\);             // clear specific mas\
k) 270.8479 Tj
0 -284.8008 Td
(6027   outb\(IO_PIC1, 0x0a\);             // read IRR by defaul\
t) 270.8479 Tj
0 -294.2942 Td
(6028 ) 21.8426 Tj
0 -303.7875 Td
(6029   outb\(IO_PIC2, 0x68\);             // OCW3) 205.3202 Tj
0 -313.2809 Td
(6030   outb\(IO_PIC2, 0x0a\);             // OCW3) 205.3202 Tj
0 -322.7743 Td
(6031 ) 21.8426 Tj
0 -332.2676 Td
(6032   if\(irqmask != 0xFFFF\)) 122.3184 Tj
0 -341.761 Td
(6033     picsetmask\(irqmask\);) 126.6869 Tj
0 -351.2543 Td
(6034 }) 26.2111 Tj
0 -360.7477 Td
(6035 ) 21.8426 Tj
0 -370.2411 Td
(6036 ) 21.8426 Tj
0 -379.7344 Td
(6037 ) 21.8426 Tj
0 -389.2278 Td
(6038 ) 21.8426 Tj
0 -398.7211 Td
(6039 ) 21.8426 Tj
0 -408.2145 Td
(6040 ) 21.8426 Tj
0 -417.7079 Td
(6041 ) 21.8426 Tj
0 -427.2012 Td
(6042 ) 21.8426 Tj
0 -436.6946 Td
(6043 ) 21.8426 Tj
0 -446.1879 Td
(6044 ) 21.8426 Tj
0 -455.6813 Td
(6045 ) 21.8426 Tj
0 -465.1747 Td
(6046 ) 21.8426 Tj
0 -474.668 Td
(6047 ) 21.8426 Tj
0 -484.1614 Td
(6048 ) 21.8426 Tj
0 -493.6547 Td
(6049 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 60) 34.9481 Tj
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q
180 500 5760 3460 re
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/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
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[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/picirq.c  Page 3) 170.3721 Tj
0 -28.4801 Td
(6050 // Blank page.) 83.0018 Tj
0 -37.9735 Td
(6051 ) 21.8426 Tj
0 -47.4668 Td
(6052 ) 21.8426 Tj
0 -56.9602 Td
(6053 ) 21.8426 Tj
0 -66.4535 Td
(6054 ) 21.8426 Tj
0 -75.9469 Td
(6055 ) 21.8426 Tj
0 -85.4403 Td
(6056 ) 21.8426 Tj
0 -94.9336 Td
(6057 ) 21.8426 Tj
0 -104.427 Td
(6058 ) 21.8426 Tj
0 -113.9203 Td
(6059 ) 21.8426 Tj
0 -123.4137 Td
(6060 ) 21.8426 Tj
0 -132.9071 Td
(6061 ) 21.8426 Tj
0 -142.4004 Td
(6062 ) 21.8426 Tj
0 -151.8938 Td
(6063 ) 21.8426 Tj
0 -161.3871 Td
(6064 ) 21.8426 Tj
0 -170.8805 Td
(6065 ) 21.8426 Tj
0 -180.3739 Td
(6066 ) 21.8426 Tj
0 -189.8672 Td
(6067 ) 21.8426 Tj
0 -199.3606 Td
(6068 ) 21.8426 Tj
0 -208.8539 Td
(6069 ) 21.8426 Tj
0 -218.3473 Td
(6070 ) 21.8426 Tj
0 -227.8407 Td
(6071 ) 21.8426 Tj
0 -237.334 Td
(6072 ) 21.8426 Tj
0 -246.8274 Td
(6073 ) 21.8426 Tj
0 -256.3207 Td
(6074 ) 21.8426 Tj
0 -265.8141 Td
(6075 ) 21.8426 Tj
0 -275.3075 Td
(6076 ) 21.8426 Tj
0 -284.8008 Td
(6077 ) 21.8426 Tj
0 -294.2942 Td
(6078 ) 21.8426 Tj
0 -303.7875 Td
(6079 ) 21.8426 Tj
0 -313.2809 Td
(6080 ) 21.8426 Tj
0 -322.7743 Td
(6081 ) 21.8426 Tj
0 -332.2676 Td
(6082 ) 21.8426 Tj
0 -341.761 Td
(6083 ) 21.8426 Tj
0 -351.2543 Td
(6084 ) 21.8426 Tj
0 -360.7477 Td
(6085 ) 21.8426 Tj
0 -370.2411 Td
(6086 ) 21.8426 Tj
0 -379.7344 Td
(6087 ) 21.8426 Tj
0 -389.2278 Td
(6088 ) 21.8426 Tj
0 -398.7211 Td
(6089 ) 21.8426 Tj
0 -408.2145 Td
(6090 ) 21.8426 Tj
0 -417.7079 Td
(6091 ) 21.8426 Tj
0 -427.2012 Td
(6092 ) 21.8426 Tj
0 -436.6946 Td
(6093 ) 21.8426 Tj
0 -446.1879 Td
(6094 ) 21.8426 Tj
0 -455.6813 Td
(6095 ) 21.8426 Tj
0 -465.1747 Td
(6096 ) 21.8426 Tj
0 -474.668 Td
(6097 ) 21.8426 Tj
0 -484.1614 Td
(6098 ) 21.8426 Tj
0 -493.6547 Td
(6099 ) 21.8426 Tj
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(Sheet 60) 34.9481 Tj
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0 0 Td
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0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/kbd.h  Page 1) 157.2665 Tj
0 -28.4801 Td
(6100 // PC keyboard interface constants) 170.3721 Tj
0 -37.9735 Td
(6101 ) 21.8426 Tj
0 -47.4668 Td
(6102 #define KBSTATP         0x64    // kbd controller status p\
ort\(I\)) 301.4275 Tj
0 -56.9602 Td
(6103 #define KBS_DIB         0x01    // kbd data in buffer) 253.3738 Tj
0 -66.4535 Td
(6104 #define KBDATAP         0x60    // kbd data port\(I\)) 244.6368 Tj
0 -75.9469 Td
(6105 ) 21.8426 Tj
0 -85.4403 Td
(6106 #define NO              0) 131.0554 Tj
0 -94.9336 Td
(6107 ) 21.8426 Tj
0 -104.427 Td
(6108 #define SHIFT           \(1<<0\)) 152.898 Tj
0 -113.9203 Td
(6109 #define CTL             \(1<<1\)) 152.898 Tj
0 -123.4137 Td
(6110 #define ALT             \(1<<2\)) 152.898 Tj
0 -132.9071 Td
(6111 ) 21.8426 Tj
0 -142.4004 Td
(6112 #define CAPSLOCK        \(1<<3\)) 152.898 Tj
0 -151.8938 Td
(6113 #define NUMLOCK         \(1<<4\)) 152.898 Tj
0 -161.3871 Td
(6114 #define SCROLLLOCK      \(1<<5\)) 152.898 Tj
0 -170.8805 Td
(6115 ) 21.8426 Tj
0 -180.3739 Td
(6116 #define E0ESC           \(1<<6\)) 152.898 Tj
0 -189.8672 Td
(6117 ) 21.8426 Tj
0 -199.3606 Td
(6118 // Special keycodes) 104.8443 Tj
0 -208.8539 Td
(6119 #define KEY_HOME        0xE0) 144.161 Tj
0 -218.3473 Td
(6120 #define KEY_END         0xE1) 144.161 Tj
0 -227.8407 Td
(6121 #define KEY_UP          0xE2) 144.161 Tj
0 -237.334 Td
(6122 #define KEY_DN          0xE3) 144.161 Tj
0 -246.8274 Td
(6123 #define KEY_LF          0xE4) 144.161 Tj
0 -256.3207 Td
(6124 #define KEY_RT          0xE5) 144.161 Tj
0 -265.8141 Td
(6125 #define KEY_PGUP        0xE6) 144.161 Tj
0 -275.3075 Td
(6126 #define KEY_PGDN        0xE7) 144.161 Tj
0 -284.8008 Td
(6127 #define KEY_INS         0xE8) 144.161 Tj
0 -294.2942 Td
(6128 #define KEY_DEL         0xE9) 144.161 Tj
0 -303.7875 Td
(6129 ) 21.8426 Tj
0 -313.2809 Td
(6130 // C\('A'\) == Control-A) 117.9499 Tj
0 -322.7743 Td
(6131 #define C\(x\) \(x - '@'\)) 117.9499 Tj
0 -332.2676 Td
(6132 ) 21.8426 Tj
0 -341.761 Td
(6133 static uchar shiftcode[256] =) 148.5295 Tj
0 -351.2543 Td
(6134 {) 26.2111 Tj
0 -360.7477 Td
(6135   [0x1D] CTL,) 78.6333 Tj
0 -370.2411 Td
(6136   [0x2A] SHIFT,) 87.3703 Tj
0 -379.7344 Td
(6137   [0x36] SHIFT,) 87.3703 Tj
0 -389.2278 Td
(6138   [0x38] ALT,) 78.6333 Tj
0 -398.7211 Td
(6139   [0x9D] CTL,) 78.6333 Tj
0 -408.2145 Td
(6140   [0xB8] ALT) 74.2647 Tj
0 -417.7079 Td
(6141 };) 30.5796 Tj
0 -427.2012 Td
(6142 ) 21.8426 Tj
0 -436.6946 Td
(6143 static uchar togglecode[256] =) 152.898 Tj
0 -446.1879 Td
(6144 {) 26.2111 Tj
0 -455.6813 Td
(6145   [0x3A] CAPSLOCK,) 100.4758 Tj
0 -465.1747 Td
(6146   [0x45] NUMLOCK,) 96.1073 Tj
0 -474.668 Td
(6147   [0x46] SCROLLLOCK) 104.8443 Tj
0 -484.1614 Td
(6148 };) 30.5796 Tj
0 -493.6547 Td
(6149 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 61) 34.9481 Tj
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180 500 5760 3460 re
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0 0 Td
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0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/kbd.h  Page 2) 157.2665 Tj
0 -28.4801 Td
(6150 static uchar normalmap[256] =) 148.5295 Tj
0 -37.9735 Td
(6151 {) 26.2111 Tj
0 -47.4668 Td
(6152   NO,   0x1B, '1',  '2',  '3',  '4',  '5',  '6',  // 0x00) 270.8479 Tj
0 -56.9602 Td
(6153   '7',  '8',  '9',  '0',  '-',  '=',  '\\b', '\\t',) 235.8998 Tj
0 -66.4535 Td
(6154   'q',  'w',  'e',  'r',  't',  'y',  'u',  'i',  // 0x10) 270.8479 Tj
0 -75.9469 Td
(6155   'o',  'p',  '[',  ']',  '\\n', NO,   'a',  's',) 231.5313 Tj
0 -85.4403 Td
(6156   'd',  'f',  'g',  'h',  'j',  'k',  'l',  ';',  // 0x20) 270.8479 Tj
0 -94.9336 Td
(6157   '\\'', '`',  NO,   '\\\\', 'z',  'x',  'c',  'v',) 231.5313 Tj
0 -104.427 Td
(6158   'b',  'n',  'm',  ',',  '.',  '/',  NO,   '*',  // 0x30) 270.8479 Tj
0 -113.9203 Td
(6159   NO,   ' ',  NO,   NO,   NO,   NO,   NO,   NO,) 227.1628 Tj
0 -123.4137 Td
(6160   NO,   NO,   NO,   NO,   NO,   NO,   NO,   '7',  // 0x40) 270.8479 Tj
0 -132.9071 Td
(6161   '8',  '9',  '-',  '4',  '5',  '6',  '+',  '1',) 231.5313 Tj
0 -142.4004 Td
(6162   '2',  '3',  '0',  '.',  NO,   NO,   NO,   NO,   // 0x50) 270.8479 Tj
0 -151.8938 Td
(6163   [0x9C] '\\n',      // KP_Enter) 157.2665 Tj
0 -161.3871 Td
(6164   [0xB5] '/',       // KP_Div) 148.5295 Tj
0 -170.8805 Td
(6165   [0xC8] KEY_UP,    [0xD0] KEY_DN,) 170.3721 Tj
0 -180.3739 Td
(6166   [0xC9] KEY_PGUP,  [0xD1] KEY_PGDN,) 179.1091 Tj
0 -189.8672 Td
(6167   [0xCB] KEY_LF,    [0xCD] KEY_RT,) 170.3721 Tj
0 -199.3606 Td
(6168   [0x97] KEY_HOME,  [0xCF] KEY_END,) 174.7406 Tj
0 -208.8539 Td
(6169   [0xD2] KEY_INS,   [0xD3] KEY_DEL) 170.3721 Tj
0 -218.3473 Td
(6170 };) 30.5796 Tj
0 -227.8407 Td
(6171 ) 21.8426 Tj
0 -237.334 Td
(6172 static uchar shiftmap[256] =) 144.161 Tj
0 -246.8274 Td
(6173 {) 26.2111 Tj
0 -256.3207 Td
(6174   NO,   033,  '!',  '@',  '#',  '$',  '%',  '^',  // 0x00) 270.8479 Tj
0 -265.8141 Td
(6175   '&',  '*',  '\(',  '\)',  '_',  '+',  '\\b', '\\t',) 235.8998 Tj
0 -275.3075 Td
(6176   'Q',  'W',  'E',  'R',  'T',  'Y',  'U',  'I',  // 0x10) 270.8479 Tj
0 -284.8008 Td
(6177   'O',  'P',  '{',  '}',  '\\n', NO,   'A',  'S',) 231.5313 Tj
0 -294.2942 Td
(6178   'D',  'F',  'G',  'H',  'J',  'K',  'L',  ':',  // 0x20) 270.8479 Tj
0 -303.7875 Td
(6179   '"',  '~',  NO,   '|',  'Z',  'X',  'C',  'V',) 231.5313 Tj
0 -313.2809 Td
(6180   'B',  'N',  'M',  '<',  '>',  '?',  NO,   '*',  // 0x30) 270.8479 Tj
0 -322.7743 Td
(6181   NO,   ' ',  NO,   NO,   NO,   NO,   NO,   NO,) 227.1628 Tj
0 -332.2676 Td
(6182   NO,   NO,   NO,   NO,   NO,   NO,   NO,   '7',  // 0x40) 270.8479 Tj
0 -341.761 Td
(6183   '8',  '9',  '-',  '4',  '5',  '6',  '+',  '1',) 231.5313 Tj
0 -351.2543 Td
(6184   '2',  '3',  '0',  '.',  NO,   NO,   NO,   NO,   // 0x50) 270.8479 Tj
0 -360.7477 Td
(6185   [0x9C] '\\n',      // KP_Enter) 157.2665 Tj
0 -370.2411 Td
(6186   [0xB5] '/',       // KP_Div) 148.5295 Tj
0 -379.7344 Td
(6187   [0xC8] KEY_UP,    [0xD0] KEY_DN,) 170.3721 Tj
0 -389.2278 Td
(6188   [0xC9] KEY_PGUP,  [0xD1] KEY_PGDN,) 179.1091 Tj
0 -398.7211 Td
(6189   [0xCB] KEY_LF,    [0xCD] KEY_RT,) 170.3721 Tj
0 -408.2145 Td
(6190   [0x97] KEY_HOME,  [0xCF] KEY_END,) 174.7406 Tj
0 -417.7079 Td
(6191   [0xD2] KEY_INS,   [0xD3] KEY_DEL) 170.3721 Tj
0 -427.2012 Td
(6192 };) 30.5796 Tj
0 -436.6946 Td
(6193 ) 21.8426 Tj
0 -446.1879 Td
(6194 ) 21.8426 Tj
0 -455.6813 Td
(6195 ) 21.8426 Tj
0 -465.1747 Td
(6196 ) 21.8426 Tj
0 -474.668 Td
(6197 ) 21.8426 Tj
0 -484.1614 Td
(6198 ) 21.8426 Tj
0 -493.6547 Td
(6199 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 61) 34.9481 Tj
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showpage
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(Aug  8 01:04 2009  xv6/kbd.h  Page 3) 157.2665 Tj
0 -28.4801 Td
(6200 static uchar ctlmap[256] =) 135.4239 Tj
0 -37.9735 Td
(6201 {) 26.2111 Tj
0 -47.4668 Td
(6202   NO,      NO,      NO,      NO,      NO,      NO,      NO\
,      NO,) 318.9016 Tj
0 -56.9602 Td
(6203   NO,      NO,      NO,      NO,      NO,      NO,      NO\
,      NO,) 318.9016 Tj
0 -66.4535 Td
(6204   C\('Q'\),  C\('W'\),  C\('E'\),  C\('R'\),  C\('T'\),  C\
\('Y'\),  C\('U'\),  C\('I'\),) 336.3756 Tj
0 -75.9469 Td
(6205   C\('O'\),  C\('P'\),  NO,      NO,      '\\r',    NO,   \
   C\('A'\),  C\('S'\),) 336.3756 Tj
0 -85.4403 Td
(6206   C\('D'\),  C\('F'\),  C\('G'\),  C\('H'\),  C\('J'\),  C\
\('K'\),  C\('L'\),  NO,) 318.9016 Tj
0 -94.9336 Td
(6207   NO,      NO,      NO,      C\('\\\\'\), C\('Z'\),  C\('X\
'\),  C\('C'\),  C\('V'\),) 336.3756 Tj
0 -104.427 Td
(6208   C\('B'\),  C\('N'\),  C\('M'\),  NO,      NO,      C\('/\
'\),  NO,      NO,) 318.9016 Tj
0 -113.9203 Td
(6209   [0x9C] '\\r',      // KP_Enter) 157.2665 Tj
0 -123.4137 Td
(6210   [0xB5] C\('/'\),    // KP_Div) 148.5295 Tj
0 -132.9071 Td
(6211   [0xC8] KEY_UP,    [0xD0] KEY_DN,) 170.3721 Tj
0 -142.4004 Td
(6212   [0xC9] KEY_PGUP,  [0xD1] KEY_PGDN,) 179.1091 Tj
0 -151.8938 Td
(6213   [0xCB] KEY_LF,    [0xCD] KEY_RT,) 170.3721 Tj
0 -161.3871 Td
(6214   [0x97] KEY_HOME,  [0xCF] KEY_END,) 174.7406 Tj
0 -170.8805 Td
(6215   [0xD2] KEY_INS,   [0xD3] KEY_DEL) 170.3721 Tj
0 -180.3739 Td
(6216 };) 30.5796 Tj
0 -189.8672 Td
(6217 ) 21.8426 Tj
0 -199.3606 Td
(6218 ) 21.8426 Tj
0 -208.8539 Td
(6219 ) 21.8426 Tj
0 -218.3473 Td
(6220 ) 21.8426 Tj
0 -227.8407 Td
(6221 ) 21.8426 Tj
0 -237.334 Td
(6222 ) 21.8426 Tj
0 -246.8274 Td
(6223 ) 21.8426 Tj
0 -256.3207 Td
(6224 ) 21.8426 Tj
0 -265.8141 Td
(6225 ) 21.8426 Tj
0 -275.3075 Td
(6226 ) 21.8426 Tj
0 -284.8008 Td
(6227 ) 21.8426 Tj
0 -294.2942 Td
(6228 ) 21.8426 Tj
0 -303.7875 Td
(6229 ) 21.8426 Tj
0 -313.2809 Td
(6230 ) 21.8426 Tj
0 -322.7743 Td
(6231 ) 21.8426 Tj
0 -332.2676 Td
(6232 ) 21.8426 Tj
0 -341.761 Td
(6233 ) 21.8426 Tj
0 -351.2543 Td
(6234 ) 21.8426 Tj
0 -360.7477 Td
(6235 ) 21.8426 Tj
0 -370.2411 Td
(6236 ) 21.8426 Tj
0 -379.7344 Td
(6237 ) 21.8426 Tj
0 -389.2278 Td
(6238 ) 21.8426 Tj
0 -398.7211 Td
(6239 ) 21.8426 Tj
0 -408.2145 Td
(6240 ) 21.8426 Tj
0 -417.7079 Td
(6241 ) 21.8426 Tj
0 -427.2012 Td
(6242 ) 21.8426 Tj
0 -436.6946 Td
(6243 ) 21.8426 Tj
0 -446.1879 Td
(6244 ) 21.8426 Tj
0 -455.6813 Td
(6245 ) 21.8426 Tj
0 -465.1747 Td
(6246 ) 21.8426 Tj
0 -474.668 Td
(6247 ) 21.8426 Tj
0 -484.1614 Td
(6248 ) 21.8426 Tj
0 -493.6547 Td
(6249 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 62) 34.9481 Tj
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q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/kbd.c  Page 1) 157.2665 Tj
0 -28.4801 Td
(6250 #include "types.h") 100.4758 Tj
0 -37.9735 Td
(6251 #include "x86.h") 91.7388 Tj
0 -47.4668 Td
(6252 #include "defs.h") 96.1073 Tj
0 -56.9602 Td
(6253 #include "kbd.h") 91.7388 Tj
0 -66.4535 Td
(6254 ) 21.8426 Tj
0 -75.9469 Td
(6255 int) 34.9481 Tj
0 -85.4403 Td
(6256 kbdgetc\(void\)) 78.6333 Tj
0 -94.9336 Td
(6257 {) 26.2111 Tj
0 -104.427 Td
(6258   static uint shift;) 109.2129 Tj
0 -113.9203 Td
(6259   static uchar *charcode[4] = {) 157.2665 Tj
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(6260     normalmap, shiftmap, ctlmap, ctlmap) 192.2146 Tj
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(6261   };) 39.3166 Tj
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(6262   uint st, data, c;) 104.8443 Tj
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(6263 ) 21.8426 Tj
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(6264   st = inb\(KBSTATP\);) 109.2129 Tj
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(6265   if\(\(st & KBS_DIB\) == 0\)) 131.0554 Tj
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(6266     return -1;) 83.0018 Tj
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(6267   data = inb\(KBDATAP\);) 117.9499 Tj
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(6268 ) 21.8426 Tj
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(6269   if\(data == 0xE0\){) 104.8443 Tj
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(6270     shift |= E0ESC;) 104.8443 Tj
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(6271     return 0;) 78.6333 Tj
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(6272   } else if\(data & 0x80\){) 131.0554 Tj
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(6273     // Key released) 104.8443 Tj
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(6274     data = \(shift & E0ESC ? data : data & 0x7F\);) 231.5313 Tj
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(6275     shift &= ~\(shiftcode[data] | E0ESC\);) 196.5831 Tj
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(6276     return 0;) 78.6333 Tj
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(6277   } else if\(shift & E0ESC\){) 139.7925 Tj
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(6278     // Last character was an E0 escape; or with 0x80) 249.0053 Tj
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(6279     data |= 0x80;) 96.1073 Tj
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(6280     shift &= ~E0ESC;) 109.2129 Tj
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(6281   }) 34.9481 Tj
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(6283   shift |= shiftcode[data];) 139.7925 Tj
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(6284   shift ^= togglecode[data];) 144.161 Tj
0 -360.7477 Td
(6285   c = charcode[shift & \(CTL | SHIFT\)][data];) 214.0572 Tj
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(6286   if\(shift & CAPSLOCK\){) 122.3184 Tj
0 -379.7344 Td
(6287     if\('a' <= c && c <= 'z'\)) 144.161 Tj
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(6288       c += 'A' - 'a';) 113.5814 Tj
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(6289     else if\('A' <= c && c <= 'Z'\)) 166.0035 Tj
0 -408.2145 Td
(6290       c += 'a' - 'A';) 113.5814 Tj
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(6291   }) 34.9481 Tj
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(6292   return c;) 69.8962 Tj
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(6293 }) 26.2111 Tj
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(6294 ) 21.8426 Tj
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(6295 void) 39.3166 Tj
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(6296 kbdintr\(void\)) 78.6333 Tj
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(6297 {) 26.2111 Tj
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(6298   consoleintr\(kbdgetc\);) 122.3184 Tj
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(6300 // Console input and output.) 144.161 Tj
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(6301 // Input is from the keyboard or serial port.) 218.4257 Tj
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(6302 // Output is written to the screen and serial port.) 244.6368 Tj
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(6303 ) 21.8426 Tj
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(6304 #include "types.h") 100.4758 Tj
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(6305 #include "defs.h") 96.1073 Tj
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(6306 #include "param.h") 100.4758 Tj
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(6307 #include "traps.h") 100.4758 Tj
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(6308 #include "spinlock.h") 113.5814 Tj
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(6309 #include "file.h") 96.1073 Tj
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(6310 #include "mmu.h") 91.7388 Tj
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(6311 #include "proc.h") 96.1073 Tj
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(6312 #include "x86.h") 91.7388 Tj
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(6316 static int panicked = 0;) 126.6869 Tj
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(6318 static struct {) 87.3703 Tj
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(int locking;) 52.4222 Tj
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(6321 } cons;) 52.4222 Tj
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(6323 static void) 69.8962 Tj
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(6325 {) 26.2111 Tj
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(6326   static char digits[] = "0123456789abcdef";) 214.0572 Tj
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(6327   char buf[16];) 87.3703 Tj
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(6328   int i = 0, neg = 0;) 113.5814 Tj
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(6329   uint x;) 61.1592 Tj
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(6330 ) 21.8426 Tj
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(6331   if\(sgn && xx < 0\){) 109.2129 Tj
0 -332.2676 Td
(6332     neg = 1;) 74.2647 Tj
0 -341.761 Td
(6333     x = -xx;) 74.2647 Tj
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(6334   } else) 56.7907 Tj
0 -360.7477 Td
(6335     x = xx;) 69.8962 Tj
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(6336 ) 21.8426 Tj
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(6337   do{) 43.6851 Tj
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(6338     buf[i++] = digits[x % base];) 161.635 Tj
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(6339   }while\(\(x /= base\) != 0\);) 139.7925 Tj
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(6340   if\(neg\)) 61.1592 Tj
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(6341     buf[i++] = '-';) 104.8443 Tj
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(6342 ) 21.8426 Tj
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(6343   while\(--i >= 0\)) 96.1073 Tj
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(6344     consputc\(buf[i]\);) 113.5814 Tj
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(6345 }) 26.2111 Tj
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(6346 ) 21.8426 Tj
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(6347 ) 21.8426 Tj
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(Aug  8 01:04 2009  xv6/console.c  Page 2) 174.7406 Tj
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(6350 // Print to the console. only understands %d, %x, %p, %s.) 270.8479 Tj
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(6351 void) 39.3166 Tj
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(6352 cprintf\(char *fmt, ...\)) 122.3184 Tj
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(6354   int i, c, state, locking;) 139.7925 Tj
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(6356   char *s;) 65.5277 Tj
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(6357 ) 21.8426 Tj
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(6358   locking = cons.locking;) 131.0554 Tj
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(6360     acquire\(&cons.lock\);) 126.6869 Tj
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(6362   argp = \(uint*\)\(void*\)&fmt + 1;) 161.635 Tj
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(6366       consputc\(c\);) 100.4758 Tj
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(6367       continue;) 87.3703 Tj
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(6371       break;) 74.2647 Tj
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(6379       break;) 74.2647 Tj
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(6382         s = "\(null\)";) 113.5814 Tj
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(6384         consputc\(*s\);) 113.5814 Tj
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(6388       break;) 74.2647 Tj
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(6390       // Print unknown % sequence to draw attention.) 249.0053 Tj
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(6392       consputc\(c\);) 100.4758 Tj
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(6393       break;) 74.2647 Tj
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(6397   if\(locking\)) 78.6333 Tj
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(6398     release\(&cons.lock\);) 126.6869 Tj
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(6412   for\(i=0; i<10; i++\)) 113.5814 Tj
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(6414   panicked = 1; // freeze other CPU) 174.7406 Tj
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(6450 #define BACKSPACE 0x100) 122.3184 Tj
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(6451 #define CRTPORT 0x3d4) 113.5814 Tj
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(6452 static ushort *crt = \(ushort*\)0xb8000;  // CGA memory) 253.3738 Tj
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(6453 ) 21.8426 Tj
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(6457   int pos;) 65.5277 Tj
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(6458 ) 21.8426 Tj
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(6459   // Cursor position: col + 80*row.) 174.7406 Tj
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(6460   outb\(CRTPORT, 14\);) 109.2129 Tj
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(6461   pos = inb\(CRTPORT+1\) << 8;) 144.161 Tj
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(6470   } else) 56.7907 Tj
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(6471     crt[pos++] = \(c&0xff\) | 0x0700;  // black on white) 257.7424 Tj
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(6473   if\(\(pos/80\) >= 24\){  // Scroll up.) 179.1091 Tj
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(6474     memmove\(crt, crt+80, sizeof\(crt[0]\)*23*80\);) 227.1628 Tj
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(6475     pos -= 80;) 83.0018 Tj
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(6476     memset\(crt+pos, 0, sizeof\(crt[0]\)*\(24*80 - pos\)\)\
;) 253.3738 Tj
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(6477   }) 34.9481 Tj
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(6502   struct spinlock lock;) 122.3184 Tj
0 -56.9602 Td
(6503   char buf[INPUT_BUF];) 117.9499 Tj
0 -66.4535 Td
(6504   uint r;  // Read index) 126.6869 Tj
0 -75.9469 Td
(6505   uint w;  // Write index) 131.0554 Tj
0 -85.4403 Td
(6506   uint e;  // Edit index) 126.6869 Tj
0 -94.9336 Td
(6507 } input;) 56.7907 Tj
0 -104.427 Td
(6508 ) 21.8426 Tj
0 -113.9203 Td
(6509 #define C\(x\)  \(\(x\)-'@'\)  // Control-x) 183.4776 Tj
0 -123.4137 Td
(6510 ) 21.8426 Tj
0 -132.9071 Td
(6511 void) 39.3166 Tj
0 -142.4004 Td
(6512 consoleintr\(int \(*getc\)\(void\)\)) 152.898 Tj
0 -151.8938 Td
(6513 {) 26.2111 Tj
0 -161.3871 Td
(6514   int c;) 56.7907 Tj
0 -170.8805 Td
(6515 ) 21.8426 Tj
0 -180.3739 Td
(6516   acquire\(&input.lock\);) 122.3184 Tj
0 -189.8672 Td
(6517   while\(\(c = getc\(\)\) >= 0\){) 139.7925 Tj
0 -199.3606 Td
(6518     switch\(c\){) 83.0018 Tj
0 -208.8539 Td
(6519     case C\('P'\):  // Process listing.) 183.4776 Tj
0 -218.3473 Td
(6520       procdump\(\);) 96.1073 Tj
0 -227.8407 Td
(6521       break;) 74.2647 Tj
0 -237.334 Td
(6522     case C\('U'\):  // Kill line.) 157.2665 Tj
0 -246.8274 Td
(6523       while\(input.e != input.w &&) 166.0035 Tj
0 -256.3207 Td
(6524             input.buf[\(input.e-1\) % INPUT_BUF] != '\\n'\)\
{) 266.4794 Tj
0 -265.8141 Td
(6525         input.e--;) 100.4758 Tj
0 -275.3075 Td
(6526         consputc\(BACKSPACE\);) 144.161 Tj
0 -284.8008 Td
(6527       }) 52.4222 Tj
0 -294.2942 Td
(6528       break;) 74.2647 Tj
0 -303.7875 Td
(6529     case C\('H'\):  // Backspace) 152.898 Tj
0 -313.2809 Td
(6530       if\(input.e != input.w\){) 148.5295 Tj
0 -322.7743 Td
(6531         input.e--;) 100.4758 Tj
0 -332.2676 Td
(6532         consputc\(BACKSPACE\);) 144.161 Tj
0 -341.761 Td
(6533       }) 52.4222 Tj
0 -351.2543 Td
(6534       break;) 74.2647 Tj
0 -360.7477 Td
(6535     default:) 74.2647 Tj
0 -370.2411 Td
(6536       if\(c != 0 && input.e-input.r < INPUT_BUF\){) 231.5313 Tj
0 -379.7344 Td
(6537         input.buf[input.e++ % INPUT_BUF] = c;) 218.4257 Tj
0 -389.2278 Td
(6538         consputc\(c\);) 109.2129 Tj
0 -398.7211 Td
(6539         if\(c == '\\n' || c == C\('D'\) || input.e == inpu\
t.r+INPUT_BUF\){) 323.2701 Tj
0 -408.2145 Td
(6540           input.w = input.e;) 144.161 Tj
0 -417.7079 Td
(6541           wakeup\(&input.r\);) 139.7925 Tj
0 -427.2012 Td
(6542         }) 61.1592 Tj
0 -436.6946 Td
(6543       }) 52.4222 Tj
0 -446.1879 Td
(6544       break;) 74.2647 Tj
0 -455.6813 Td
(6545     }) 43.6851 Tj
0 -465.1747 Td
(6546   }) 34.9481 Tj
0 -474.668 Td
(6547   release\(&input.lock\);) 122.3184 Tj
0 -484.1614 Td
(6548 }) 26.2111 Tj
0 -493.6547 Td
(6549 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 65) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/console.c  Page 6) 174.7406 Tj
0 -28.4801 Td
(6550 int) 34.9481 Tj
0 -37.9735 Td
(6551 consoleread\(struct inode *ip, char *dst, int n\)) 227.1628 Tj
0 -47.4668 Td
(6552 {) 26.2111 Tj
0 -56.9602 Td
(6553   uint target;) 83.0018 Tj
0 -66.4535 Td
(6554   int c;) 56.7907 Tj
0 -75.9469 Td
(6555 ) 21.8426 Tj
0 -85.4403 Td
(6556   iunlock\(ip\);) 83.0018 Tj
0 -94.9336 Td
(6557   target = n;) 78.6333 Tj
0 -104.427 Td
(6558   acquire\(&input.lock\);) 122.3184 Tj
0 -113.9203 Td
(6559   while\(n > 0\){) 87.3703 Tj
0 -123.4137 Td
(6560     while\(input.r == input.w\){) 152.898 Tj
0 -132.9071 Td
(6561       if\(cp->killed\){) 113.5814 Tj
0 -142.4004 Td
(6562         release\(&input.lock\);) 148.5295 Tj
0 -151.8938 Td
(6563         ilock\(ip\);) 100.4758 Tj
0 -161.3871 Td
(6564         return -1;) 100.4758 Tj
0 -170.8805 Td
(6565       }) 52.4222 Tj
0 -180.3739 Td
(6566       sleep\(&input.r, &input.lock\);) 174.7406 Tj
0 -189.8672 Td
(6567     }) 43.6851 Tj
0 -199.3606 Td
(6568     c = input.buf[input.r++ % INPUT_BUF];) 200.9517 Tj
0 -208.8539 Td
(6569     if\(c == C\('D'\)\){  // EOF) 144.161 Tj
0 -218.3473 Td
(6570       if\(n < target\){) 113.5814 Tj
0 -227.8407 Td
(6571         // Save ^D for next time, to make sure) 222.7942 Tj
0 -237.334 Td
(6572         // caller gets a 0-byte result.) 192.2146 Tj
0 -246.8274 Td
(6573         input.r--;) 100.4758 Tj
0 -256.3207 Td
(6574       }) 52.4222 Tj
0 -265.8141 Td
(6575       break;) 74.2647 Tj
0 -275.3075 Td
(6576     }) 43.6851 Tj
0 -284.8008 Td
(6577     *dst++ = c;) 87.3703 Tj
0 -294.2942 Td
(6578     --n;) 56.7907 Tj
0 -303.7875 Td
(6579     if\(c == '\\n'\)) 96.1073 Tj
0 -313.2809 Td
(6580       break;) 74.2647 Tj
0 -322.7743 Td
(6581   }) 34.9481 Tj
0 -332.2676 Td
(6582   release\(&input.lock\);) 122.3184 Tj
0 -341.761 Td
(6583   ilock\(ip\);) 74.2647 Tj
0 -351.2543 Td
(6584 ) 21.8426 Tj
0 -360.7477 Td
(6585   return target - n;) 109.2129 Tj
0 -370.2411 Td
(6586 }) 26.2111 Tj
0 -379.7344 Td
(6587 ) 21.8426 Tj
0 -389.2278 Td
(6588 ) 21.8426 Tj
0 -398.7211 Td
(6589 ) 21.8426 Tj
0 -408.2145 Td
(6590 ) 21.8426 Tj
0 -417.7079 Td
(6591 ) 21.8426 Tj
0 -427.2012 Td
(6592 ) 21.8426 Tj
0 -436.6946 Td
(6593 ) 21.8426 Tj
0 -446.1879 Td
(6594 ) 21.8426 Tj
0 -455.6813 Td
(6595 ) 21.8426 Tj
0 -465.1747 Td
(6596 ) 21.8426 Tj
0 -474.668 Td
(6597 ) 21.8426 Tj
0 -484.1614 Td
(6598 ) 21.8426 Tj
0 -493.6547 Td
(6599 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 65) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 73 73
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/console.c  Page 7) 174.7406 Tj
0 -28.4801 Td
(6600 int) 34.9481 Tj
0 -37.9735 Td
(6601 consolewrite\(struct inode *ip, char *buf, int n\)) 231.5313 Tj
0 -47.4668 Td
(6602 {) 26.2111 Tj
0 -56.9602 Td
(6603   int i;) 56.7907 Tj
0 -66.4535 Td
(6604 ) 21.8426 Tj
0 -75.9469 Td
(6605   iunlock\(ip\);) 83.0018 Tj
0 -85.4403 Td
(6606   acquire\(&cons.lock\);) 117.9499 Tj
0 -94.9336 Td
(6607   for\(i = 0; i < n; i++\)) 126.6869 Tj
0 -104.427 Td
(6608     consputc\(buf[i] & 0xff\);) 144.161 Tj
0 -113.9203 Td
(6609   release\(&cons.lock\);) 117.9499 Tj
0 -123.4137 Td
(6610   ilock\(ip\);) 74.2647 Tj
0 -132.9071 Td
(6611 ) 21.8426 Tj
0 -142.4004 Td
(6612   return n;) 69.8962 Tj
0 -151.8938 Td
(6613 }) 26.2111 Tj
0 -161.3871 Td
(6614 ) 21.8426 Tj
0 -170.8805 Td
(6615 void) 39.3166 Tj
0 -180.3739 Td
(6616 consoleinit\(void\)) 96.1073 Tj
0 -189.8672 Td
(6617 {) 26.2111 Tj
0 -199.3606 Td
(6618   initlock\(&cons.lock, "console"\);) 170.3721 Tj
0 -208.8539 Td
(6619   initlock\(&input.lock, "input"\);) 166.0035 Tj
0 -218.3473 Td
(6620 ) 21.8426 Tj
0 -227.8407 Td
(6621   devsw[CONSOLE].write = consolewrite;) 187.8461 Tj
0 -237.334 Td
(6622   devsw[CONSOLE].read = consoleread;) 179.1091 Tj
0 -246.8274 Td
(6623   cons.locking = 1;) 104.8443 Tj
0 -256.3207 Td
(6624 ) 21.8426 Tj
0 -265.8141 Td
(6625   picenable\(IRQ_KBD\);) 113.5814 Tj
0 -275.3075 Td
(6626   ioapicenable\(IRQ_KBD, 0\);) 139.7925 Tj
0 -284.8008 Td
(6627 }) 26.2111 Tj
0 -294.2942 Td
(6628 ) 21.8426 Tj
0 -303.7875 Td
(6629 ) 21.8426 Tj
0 -313.2809 Td
(6630 ) 21.8426 Tj
0 -322.7743 Td
(6631 ) 21.8426 Tj
0 -332.2676 Td
(6632 ) 21.8426 Tj
0 -341.761 Td
(6633 ) 21.8426 Tj
0 -351.2543 Td
(6634 ) 21.8426 Tj
0 -360.7477 Td
(6635 ) 21.8426 Tj
0 -370.2411 Td
(6636 ) 21.8426 Tj
0 -379.7344 Td
(6637 ) 21.8426 Tj
0 -389.2278 Td
(6638 ) 21.8426 Tj
0 -398.7211 Td
(6639 ) 21.8426 Tj
0 -408.2145 Td
(6640 ) 21.8426 Tj
0 -417.7079 Td
(6641 ) 21.8426 Tj
0 -427.2012 Td
(6642 ) 21.8426 Tj
0 -436.6946 Td
(6643 ) 21.8426 Tj
0 -446.1879 Td
(6644 ) 21.8426 Tj
0 -455.6813 Td
(6645 ) 21.8426 Tj
0 -465.1747 Td
(6646 ) 21.8426 Tj
0 -474.668 Td
(6647 ) 21.8426 Tj
0 -484.1614 Td
(6648 ) 21.8426 Tj
0 -493.6547 Td
(6649 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 66) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/timer.c  Page 1) 166.0035 Tj
0 -28.4801 Td
(6650 // Intel 8253/8254/82C54 Programmable Interval Timer \(PIT\
\).) 279.5849 Tj
0 -37.9735 Td
(6651 // Only used on uniprocessors;) 152.898 Tj
0 -47.4668 Td
(6652 // SMP machines use the local APIC timer.) 200.9517 Tj
0 -56.9602 Td
(6653 ) 21.8426 Tj
0 -66.4535 Td
(6654 #include "types.h") 100.4758 Tj
0 -75.9469 Td
(6655 #include "defs.h") 96.1073 Tj
0 -85.4403 Td
(6656 #include "traps.h") 100.4758 Tj
0 -94.9336 Td
(6657 #include "x86.h") 91.7388 Tj
0 -104.427 Td
(6658 ) 21.8426 Tj
0 -113.9203 Td
(6659 #define IO_TIMER1       0x040           // 8253 Timer #1) 266.4794 Tj
0 -123.4137 Td
(6660 ) 21.8426 Tj
0 -132.9071 Td
(6661 // Frequency of all three count-down timers;) 214.0572 Tj
0 -142.4004 Td
(6662 // \(TIMER_FREQ/freq\) is the appropriate count) 218.4257 Tj
0 -151.8938 Td
(6663 // to generate a frequency of freq Hz.) 187.8461 Tj
0 -161.3871 Td
(6664 ) 21.8426 Tj
0 -170.8805 Td
(6665 #define TIMER_FREQ      1193182) 157.2665 Tj
0 -180.3739 Td
(6666 #define TIMER_DIV\(x\)    \(\(TIMER_FREQ+\(x\)/2\)/\(x\)\)) 231.5313 Tj
0 -189.8672 Td
(6667 ) 21.8426 Tj
0 -199.3606 Td
(6668 #define TIMER_MODE      \(IO_TIMER1 + 3\) // timer mode po\
rt) 275.2164 Tj
0 -208.8539 Td
(6669 #define TIMER_SEL0      0x00    // select counter 0) 244.6368 Tj
0 -218.3473 Td
(6670 #define TIMER_RATEGEN   0x04    // mode 2, rate generator) 270.8479 Tj
0 -227.8407 Td
(6671 #define TIMER_16BIT     0x30    // r/w counter 16 bits, LS\
B first) 305.796 Tj
0 -237.334 Td
(6672 ) 21.8426 Tj
0 -246.8274 Td
(6673 void) 39.3166 Tj
0 -256.3207 Td
(6674 timerinit\(void\)) 87.3703 Tj
0 -265.8141 Td
(6675 {) 26.2111 Tj
0 -275.3075 Td
(6676   // Interrupt 100 times/sec.) 148.5295 Tj
0 -284.8008 Td
(6677   outb\(TIMER_MODE, TIMER_SEL0 | TIMER_RATEGEN | TIMER_16B\
IT\);) 288.322 Tj
0 -294.2942 Td
(6678   outb\(IO_TIMER1, TIMER_DIV\(100\) % 256\);) 196.5831 Tj
0 -303.7875 Td
(6679   outb\(IO_TIMER1, TIMER_DIV\(100\) / 256\);) 196.5831 Tj
0 -313.2809 Td
(6680   picenable\(IRQ_TIMER\);) 122.3184 Tj
0 -322.7743 Td
(6681 }) 26.2111 Tj
0 -332.2676 Td
(6682 ) 21.8426 Tj
0 -341.761 Td
(6683 ) 21.8426 Tj
0 -351.2543 Td
(6684 ) 21.8426 Tj
0 -360.7477 Td
(6685 ) 21.8426 Tj
0 -370.2411 Td
(6686 ) 21.8426 Tj
0 -379.7344 Td
(6687 ) 21.8426 Tj
0 -389.2278 Td
(6688 ) 21.8426 Tj
0 -398.7211 Td
(6689 ) 21.8426 Tj
0 -408.2145 Td
(6690 ) 21.8426 Tj
0 -417.7079 Td
(6691 ) 21.8426 Tj
0 -427.2012 Td
(6692 ) 21.8426 Tj
0 -436.6946 Td
(6693 ) 21.8426 Tj
0 -446.1879 Td
(6694 ) 21.8426 Tj
0 -455.6813 Td
(6695 ) 21.8426 Tj
0 -465.1747 Td
(6696 ) 21.8426 Tj
0 -474.668 Td
(6697 ) 21.8426 Tj
0 -484.1614 Td
(6698 ) 21.8426 Tj
0 -493.6547 Td
(6699 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 66) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 74 74
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/initcode.S  Page 1) 179.1091 Tj
0 -28.4801 Td
(6700 # Initial process execs /init.) 152.898 Tj
0 -37.9735 Td
(6701 ) 21.8426 Tj
0 -47.4668 Td
(6702 #include "syscall.h") 109.2129 Tj
0 -56.9602 Td
(6703 #include "traps.h") 100.4758 Tj
0 -66.4535 Td
(6704 ) 21.8426 Tj
0 -75.9469 Td
(6705 # exec\(init, argv\)) 100.4758 Tj
0 -85.4403 Td
(6706 .globl start) 74.2647 Tj
0 -94.9336 Td
(6707 start:) 48.0537 Tj
0 -104.427 Td
(6708   pushl $argv) 78.6333 Tj
0 -113.9203 Td
(6709   pushl $init) 78.6333 Tj
0 -123.4137 Td
(6710   pushl $0  // where caller pc would be) 192.2146 Tj
0 -132.9071 Td
(6711   movl $SYS_exec, %eax) 117.9499 Tj
0 -142.4004 Td
(6712   int $T_SYSCALL) 91.7388 Tj
0 -151.8938 Td
(6713 ) 21.8426 Tj
0 -161.3871 Td
(6714 # for\(;;\) exit\(\);) 96.1073 Tj
0 -170.8805 Td
(6715 exit:) 43.6851 Tj
0 -180.3739 Td
(6716   movl $SYS_exit, %eax) 117.9499 Tj
0 -189.8672 Td
(6717   int $T_SYSCALL) 91.7388 Tj
0 -199.3606 Td
(6718   jmp exit) 65.5277 Tj
0 -208.8539 Td
(6719 ) 21.8426 Tj
0 -218.3473 Td
(6720 # char init[] = "/init\\0";) 135.4239 Tj
0 -227.8407 Td
(6721 init:) 43.6851 Tj
0 -237.334 Td
(6722   .string "/init\\0") 104.8443 Tj
0 -246.8274 Td
(6723 ) 21.8426 Tj
0 -256.3207 Td
(6724 # char *argv[] = { init, 0 };) 148.5295 Tj
0 -265.8141 Td
(6725 .p2align 2) 65.5277 Tj
0 -275.3075 Td
(6726 argv:) 43.6851 Tj
0 -284.8008 Td
(6727   .long init) 74.2647 Tj
0 -294.2942 Td
(6728   .long 0) 61.1592 Tj
0 -303.7875 Td
(6729 ) 21.8426 Tj
0 -313.2809 Td
(6730 ) 21.8426 Tj
0 -322.7743 Td
(6731 ) 21.8426 Tj
0 -332.2676 Td
(6732 ) 21.8426 Tj
0 -341.761 Td
(6733 ) 21.8426 Tj
0 -351.2543 Td
(6734 ) 21.8426 Tj
0 -360.7477 Td
(6735 ) 21.8426 Tj
0 -370.2411 Td
(6736 ) 21.8426 Tj
0 -379.7344 Td
(6737 ) 21.8426 Tj
0 -389.2278 Td
(6738 ) 21.8426 Tj
0 -398.7211 Td
(6739 ) 21.8426 Tj
0 -408.2145 Td
(6740 ) 21.8426 Tj
0 -417.7079 Td
(6741 ) 21.8426 Tj
0 -427.2012 Td
(6742 ) 21.8426 Tj
0 -436.6946 Td
(6743 ) 21.8426 Tj
0 -446.1879 Td
(6744 ) 21.8426 Tj
0 -455.6813 Td
(6745 ) 21.8426 Tj
0 -465.1747 Td
(6746 ) 21.8426 Tj
0 -474.668 Td
(6747 ) 21.8426 Tj
0 -484.1614 Td
(6748 ) 21.8426 Tj
0 -493.6547 Td
(6749 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 67) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/usys.S  Page 1) 161.635 Tj
0 -28.4801 Td
(6750 #include "syscall.h") 109.2129 Tj
0 -37.9735 Td
(6751 #include "traps.h") 100.4758 Tj
0 -47.4668 Td
(6752 ) 21.8426 Tj
0 -56.9602 Td
(6753 #define SYSCALL\(name\) \\) 122.3184 Tj
0 -66.4535 Td
(6754   .globl name; \\) 91.7388 Tj
0 -75.9469 Td
(6755   name: \\) 61.1592 Tj
0 -85.4403 Td
(6756     movl $SYS_ ## name, %eax; \\) 157.2665 Tj
0 -94.9336 Td
(6757     int $T_SYSCALL; \\) 113.5814 Tj
0 -104.427 Td
(6758     ret) 52.4222 Tj
0 -113.9203 Td
(6759 ) 21.8426 Tj
0 -123.4137 Td
(6760 SYSCALL\(fork\)) 78.6333 Tj
0 -132.9071 Td
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(6798 ) 21.8426 Tj
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(6851 ) 21.8426 Tj
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(6852 #include "types.h") 100.4758 Tj
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(6911   struct listcmd *lcmd;) 122.3184 Tj
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0 -161.3871 Td
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(6915   if\(cmd == 0\)) 83.0018 Tj
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0 -189.8672 Td
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(6928     break;) 65.5277 Tj
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(6938     break;) 65.5277 Tj
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(6944     wait\(\);) 69.8962 Tj
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(6946     break;) 65.5277 Tj
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(6947 ) 21.8426 Tj
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(6949 ) 21.8426 Tj
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(6951     pcmd = \(struct pipecmd*\)cmd;) 161.635 Tj
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(7014   // Read and run input commands.) 166.0035 Tj
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(7015   while\(getcmd\(buf, sizeof\(buf\)\) >= 0\){) 192.2146 Tj
0 -180.3739 Td
(7016     if\(buf[0] == 'c' && buf[1] == 'd' && buf[2] == ' '\){) 266.4794 Tj
0 -189.8672 Td
(7017       // Clumsy but will have to do for now.) 214.0572 Tj
0 -199.3606 Td
(7018       // Chdir has no effect on the parent if run in the c\
hild.) 297.059 Tj
0 -208.8539 Td
(7019       buf[strlen\(buf\)-1] = 0;  // chop \\n) 200.9517 Tj
0 -218.3473 Td
(7020       if\(chdir\(buf+3\) < 0\)) 135.4239 Tj
0 -227.8407 Td
(7021         printf\(2, "cannot cd %s\\n", buf+3\);) 209.6887 Tj
0 -237.334 Td
(7022       continue;) 87.3703 Tj
0 -246.8274 Td
(7023     }) 43.6851 Tj
0 -256.3207 Td
(7024     if\(fork1\(\) == 0\)) 109.2129 Tj
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(7025       runcmd\(parsecmd\(buf\)\);) 144.161 Tj
0 -275.3075 Td
(7026     wait\(\);) 69.8962 Tj
0 -284.8008 Td
(7027   }) 34.9481 Tj
0 -294.2942 Td
(7028   exit\(\);) 61.1592 Tj
0 -303.7875 Td
(7029 }) 26.2111 Tj
0 -313.2809 Td
(7030 ) 21.8426 Tj
0 -322.7743 Td
(7031 void) 39.3166 Tj
0 -332.2676 Td
(7032 panic\(char *s\)) 83.0018 Tj
0 -341.761 Td
(7033 {) 26.2111 Tj
0 -351.2543 Td
(7034   printf\(2, "%s\\n", s\);) 122.3184 Tj
0 -360.7477 Td
(7035   exit\(\);) 61.1592 Tj
0 -370.2411 Td
(7036 }) 26.2111 Tj
0 -379.7344 Td
(7037 ) 21.8426 Tj
0 -389.2278 Td
(7038 int) 34.9481 Tj
0 -398.7211 Td
(7039 fork1\(void\)) 69.8962 Tj
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(7040 {) 26.2111 Tj
0 -417.7079 Td
(7041   int pid;) 65.5277 Tj
0 -427.2012 Td
(7042 ) 21.8426 Tj
0 -436.6946 Td
(7043   pid = fork\(\);) 87.3703 Tj
0 -446.1879 Td
(7044   if\(pid == -1\)) 87.3703 Tj
0 -455.6813 Td
(7045     panic\("fork"\);) 100.4758 Tj
0 -465.1747 Td
(7046   return pid;) 78.6333 Tj
0 -474.668 Td
(7047 }) 26.2111 Tj
0 -484.1614 Td
(7048 ) 21.8426 Tj
0 -493.6547 Td
(7049 ) 21.8426 Tj
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(Sheet 70) 34.9481 Tj
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(7051 ) 21.8426 Tj
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(7052 struct cmd*) 69.8962 Tj
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(7053 execcmd\(void\)) 78.6333 Tj
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(7054 {) 26.2111 Tj
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(7055   struct execcmd *cmd;) 117.9499 Tj
0 -85.4403 Td
(7056 ) 21.8426 Tj
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(7057   cmd = malloc\(sizeof\(*cmd\)\);) 148.5295 Tj
0 -104.427 Td
(7058   memset\(cmd, 0, sizeof\(*cmd\)\);) 157.2665 Tj
0 -113.9203 Td
(7059   cmd->type = EXEC;) 104.8443 Tj
0 -123.4137 Td
(7060   return \(struct cmd*\)cmd;) 135.4239 Tj
0 -132.9071 Td
(7061 }) 26.2111 Tj
0 -142.4004 Td
(7062 ) 21.8426 Tj
0 -151.8938 Td
(7063 struct cmd*) 69.8962 Tj
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(7064 redircmd\(struct cmd *subcmd, char *file, char *efile, int\
 mode, int fd\)) 332.0071 Tj
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(7065 {) 26.2111 Tj
0 -180.3739 Td
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0 -199.3606 Td
(7068   cmd = malloc\(sizeof\(*cmd\)\);) 148.5295 Tj
0 -208.8539 Td
(7069   memset\(cmd, 0, sizeof\(*cmd\)\);) 157.2665 Tj
0 -218.3473 Td
(7070   cmd->type = REDIR;) 109.2129 Tj
0 -227.8407 Td
(7071   cmd->cmd = subcmd;) 109.2129 Tj
0 -237.334 Td
(7072   cmd->file = file;) 104.8443 Tj
0 -246.8274 Td
(7073   cmd->efile = efile;) 113.5814 Tj
0 -256.3207 Td
(7074   cmd->mode = mode;) 104.8443 Tj
0 -265.8141 Td
(7075   cmd->fd = fd;) 87.3703 Tj
0 -275.3075 Td
(7076   return \(struct cmd*\)cmd;) 135.4239 Tj
0 -284.8008 Td
(7077 }) 26.2111 Tj
0 -294.2942 Td
(7078 ) 21.8426 Tj
0 -303.7875 Td
(7079 struct cmd*) 69.8962 Tj
0 -313.2809 Td
(7080 pipecmd\(struct cmd *left, struct cmd *right\)) 214.0572 Tj
0 -322.7743 Td
(7081 {) 26.2111 Tj
0 -332.2676 Td
(7082   struct pipecmd *cmd;) 117.9499 Tj
0 -341.761 Td
(7083 ) 21.8426 Tj
0 -351.2543 Td
(7084   cmd = malloc\(sizeof\(*cmd\)\);) 148.5295 Tj
0 -360.7477 Td
(7085   memset\(cmd, 0, sizeof\(*cmd\)\);) 157.2665 Tj
0 -370.2411 Td
(7086   cmd->type = PIPE;) 104.8443 Tj
0 -379.7344 Td
(7087   cmd->left = left;) 104.8443 Tj
0 -389.2278 Td
(7088   cmd->right = right;) 113.5814 Tj
0 -398.7211 Td
(7089   return \(struct cmd*\)cmd;) 135.4239 Tj
0 -408.2145 Td
(7090 }) 26.2111 Tj
0 -417.7079 Td
(7091 ) 21.8426 Tj
0 -427.2012 Td
(7092 ) 21.8426 Tj
0 -436.6946 Td
(7093 ) 21.8426 Tj
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(7094 ) 21.8426 Tj
0 -455.6813 Td
(7095 ) 21.8426 Tj
0 -465.1747 Td
(7096 ) 21.8426 Tj
0 -474.668 Td
(7097 ) 21.8426 Tj
0 -484.1614 Td
(7098 ) 21.8426 Tj
0 -493.6547 Td
(7099 ) 21.8426 Tj
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(Sheet 70) 34.9481 Tj
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(7101 listcmd\(struct cmd *left, struct cmd *right\)) 214.0572 Tj
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(7102 {) 26.2111 Tj
0 -56.9602 Td
(7103   struct listcmd *cmd;) 117.9499 Tj
0 -66.4535 Td
(7104 ) 21.8426 Tj
0 -75.9469 Td
(7105   cmd = malloc\(sizeof\(*cmd\)\);) 148.5295 Tj
0 -85.4403 Td
(7106   memset\(cmd, 0, sizeof\(*cmd\)\);) 157.2665 Tj
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(7107   cmd->type = LIST;) 104.8443 Tj
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(7108   cmd->left = left;) 104.8443 Tj
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(7109   cmd->right = right;) 113.5814 Tj
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(7110   return \(struct cmd*\)cmd;) 135.4239 Tj
0 -132.9071 Td
(7111 }) 26.2111 Tj
0 -142.4004 Td
(7112 ) 21.8426 Tj
0 -151.8938 Td
(7113 struct cmd*) 69.8962 Tj
0 -161.3871 Td
(7114 backcmd\(struct cmd *subcmd\)) 139.7925 Tj
0 -170.8805 Td
(7115 {) 26.2111 Tj
0 -180.3739 Td
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0 -189.8672 Td
(7117 ) 21.8426 Tj
0 -199.3606 Td
(7118   cmd = malloc\(sizeof\(*cmd\)\);) 148.5295 Tj
0 -208.8539 Td
(7119   memset\(cmd, 0, sizeof\(*cmd\)\);) 157.2665 Tj
0 -218.3473 Td
(7120   cmd->type = BACK;) 104.8443 Tj
0 -227.8407 Td
(7121   cmd->cmd = subcmd;) 109.2129 Tj
0 -237.334 Td
(7122   return \(struct cmd*\)cmd;) 135.4239 Tj
0 -246.8274 Td
(7123 }) 26.2111 Tj
0 -256.3207 Td
(7124 ) 21.8426 Tj
0 -265.8141 Td
(7125 ) 21.8426 Tj
0 -275.3075 Td
(7126 ) 21.8426 Tj
0 -284.8008 Td
(7127 ) 21.8426 Tj
0 -294.2942 Td
(7128 ) 21.8426 Tj
0 -303.7875 Td
(7129 ) 21.8426 Tj
0 -313.2809 Td
(7130 ) 21.8426 Tj
0 -322.7743 Td
(7131 ) 21.8426 Tj
0 -332.2676 Td
(7132 ) 21.8426 Tj
0 -341.761 Td
(7133 ) 21.8426 Tj
0 -351.2543 Td
(7134 ) 21.8426 Tj
0 -360.7477 Td
(7135 ) 21.8426 Tj
0 -370.2411 Td
(7136 ) 21.8426 Tj
0 -379.7344 Td
(7137 ) 21.8426 Tj
0 -389.2278 Td
(7138 ) 21.8426 Tj
0 -398.7211 Td
(7139 ) 21.8426 Tj
0 -408.2145 Td
(7140 ) 21.8426 Tj
0 -417.7079 Td
(7141 ) 21.8426 Tj
0 -427.2012 Td
(7142 ) 21.8426 Tj
0 -436.6946 Td
(7143 ) 21.8426 Tj
0 -446.1879 Td
(7144 ) 21.8426 Tj
0 -455.6813 Td
(7145 ) 21.8426 Tj
0 -465.1747 Td
(7146 ) 21.8426 Tj
0 -474.668 Td
(7147 ) 21.8426 Tj
0 -484.1614 Td
(7148 ) 21.8426 Tj
0 -493.6547 Td
(7149 ) 21.8426 Tj
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(Sheet 71) 34.9481 Tj
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(Aug  8 01:04 2009  xv6/sh.c  Page 7) 152.898 Tj
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(7150 // Parsing) 65.5277 Tj
0 -37.9735 Td
(7151 ) 21.8426 Tj
0 -47.4668 Td
(7152 char whitespace[] = " \\t\\r\\n\\v";) 161.635 Tj
0 -56.9602 Td
(7153 char symbols[] = "<|>&;\(\)";) 139.7925 Tj
0 -66.4535 Td
(7154 ) 21.8426 Tj
0 -75.9469 Td
(7155 int) 34.9481 Tj
0 -85.4403 Td
(7156 gettoken\(char **ps, char *es, char **q, char **eq\)) 240.2683 Tj
0 -94.9336 Td
(7157 {) 26.2111 Tj
0 -104.427 Td
(7158   char *s;) 65.5277 Tj
0 -113.9203 Td
(7159   int ret;) 65.5277 Tj
0 -123.4137 Td
(7160 ) 21.8426 Tj
0 -132.9071 Td
(7161   s = *ps;) 65.5277 Tj
0 -142.4004 Td
(7162   while\(s < es && strchr\(whitespace, *s\)\)) 200.9517 Tj
0 -151.8938 Td
(7163     s++;) 56.7907 Tj
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(7164   if\(q\)) 52.4222 Tj
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(7165     *q = s;) 69.8962 Tj
0 -180.3739 Td
(7166   ret = *s;) 69.8962 Tj
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(7167   switch\(*s\){) 78.6333 Tj
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(7168   case 0:) 61.1592 Tj
0 -208.8539 Td
(7169     break;) 65.5277 Tj
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(7170   case '|':) 69.8962 Tj
0 -227.8407 Td
(7171   case '\(':) 69.8962 Tj
0 -237.334 Td
(7172   case '\)':) 69.8962 Tj
0 -246.8274 Td
(7173   case ';':) 69.8962 Tj
0 -256.3207 Td
(7174   case '&':) 69.8962 Tj
0 -265.8141 Td
(7175   case '<':) 69.8962 Tj
0 -275.3075 Td
(7176     s++;) 56.7907 Tj
0 -284.8008 Td
(7177     break;) 65.5277 Tj
0 -294.2942 Td
(7178   case '>':) 69.8962 Tj
0 -303.7875 Td
(7179     s++;) 56.7907 Tj
0 -313.2809 Td
(7180     if\(*s == '>'\){) 100.4758 Tj
0 -322.7743 Td
(7181       ret = '+';) 91.7388 Tj
0 -332.2676 Td
(7182       s++;) 65.5277 Tj
0 -341.761 Td
(7183     }) 43.6851 Tj
0 -351.2543 Td
(7184     break;) 65.5277 Tj
0 -360.7477 Td
(7185   default:) 65.5277 Tj
0 -370.2411 Td
(7186     ret = 'a';) 83.0018 Tj
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(7187     while\(s < es && !strchr\(whitespace, *s\) && !strchr\(\
symbols, *s\)\)) 318.9016 Tj
0 -389.2278 Td
(7188       s++;) 65.5277 Tj
0 -398.7211 Td
(7189     break;) 65.5277 Tj
0 -408.2145 Td
(7190   }) 34.9481 Tj
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(7191   if\(eq\)) 56.7907 Tj
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(7192     *eq = s;) 74.2647 Tj
0 -436.6946 Td
(7193 ) 21.8426 Tj
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(7195     s++;) 56.7907 Tj
0 -465.1747 Td
(7196   *ps = s;) 65.5277 Tj
0 -474.668 Td
(7197   return ret;) 78.6333 Tj
0 -484.1614 Td
(7198 }) 26.2111 Tj
0 -493.6547 Td
(7199 ) 21.8426 Tj
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(Sheet 71) 34.9481 Tj
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(7200 int) 34.9481 Tj
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(7201 peek\(char **ps, char *es, char *toks\)) 183.4776 Tj
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(7202 {) 26.2111 Tj
0 -56.9602 Td
(7203   char *s;) 65.5277 Tj
0 -66.4535 Td
(7204 ) 21.8426 Tj
0 -75.9469 Td
(7205   s = *ps;) 65.5277 Tj
0 -85.4403 Td
(7206   while\(s < es && strchr\(whitespace, *s\)\)) 200.9517 Tj
0 -94.9336 Td
(7207     s++;) 56.7907 Tj
0 -104.427 Td
(7208   *ps = s;) 65.5277 Tj
0 -113.9203 Td
(7209   return *s && strchr\(toks, *s\);) 161.635 Tj
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(7210 }) 26.2111 Tj
0 -132.9071 Td
(7211 ) 21.8426 Tj
0 -142.4004 Td
(7212 struct cmd *parseline\(char**, char*\);) 183.4776 Tj
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(7213 struct cmd *parsepipe\(char**, char*\);) 183.4776 Tj
0 -161.3871 Td
(7214 struct cmd *parseexec\(char**, char*\);) 183.4776 Tj
0 -170.8805 Td
(7215 struct cmd *nulterminate\(struct cmd*\);) 187.8461 Tj
0 -180.3739 Td
(7216 ) 21.8426 Tj
0 -189.8672 Td
(7217 struct cmd*) 69.8962 Tj
0 -199.3606 Td
(7218 parsecmd\(char *s\)) 96.1073 Tj
0 -208.8539 Td
(7219 {) 26.2111 Tj
0 -218.3473 Td
(7220   char *es;) 69.8962 Tj
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(7221   struct cmd *cmd;) 100.4758 Tj
0 -237.334 Td
(7222 ) 21.8426 Tj
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(7223   es = s + strlen\(s\);) 113.5814 Tj
0 -256.3207 Td
(7224   cmd = parseline\(&s, es\);) 135.4239 Tj
0 -265.8141 Td
(7225   peek\(&s, es, ""\);) 104.8443 Tj
0 -275.3075 Td
(7226   if\(s != es\){) 83.0018 Tj
0 -284.8008 Td
(7227     printf\(2, "leftovers: %s\\n", s\);) 179.1091 Tj
0 -294.2942 Td
(7228     panic\("syntax"\);) 109.2129 Tj
0 -303.7875 Td
(7229   }) 34.9481 Tj
0 -313.2809 Td
(7230   nulterminate\(cmd\);) 109.2129 Tj
0 -322.7743 Td
(7231   return cmd;) 78.6333 Tj
0 -332.2676 Td
(7232 }) 26.2111 Tj
0 -341.761 Td
(7233 ) 21.8426 Tj
0 -351.2543 Td
(7234 struct cmd*) 69.8962 Tj
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(7236 {) 26.2111 Tj
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(7237   struct cmd *cmd;) 100.4758 Tj
0 -389.2278 Td
(7238 ) 21.8426 Tj
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(7239   cmd = parsepipe\(ps, es\);) 135.4239 Tj
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(7240   while\(peek\(ps, es, "&"\)\){) 139.7925 Tj
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(7241     gettoken\(ps, es, 0, 0\);) 139.7925 Tj
0 -427.2012 Td
(7242     cmd = backcmd\(cmd\);) 122.3184 Tj
0 -436.6946 Td
(7243   }) 34.9481 Tj
0 -446.1879 Td
(7244   if\(peek\(ps, es, ";"\)\){) 126.6869 Tj
0 -455.6813 Td
(7245     gettoken\(ps, es, 0, 0\);) 139.7925 Tj
0 -465.1747 Td
(7246     cmd = listcmd\(cmd, parseline\(ps, es\)\);) 205.3202 Tj
0 -474.668 Td
(7247   }) 34.9481 Tj
0 -484.1614 Td
(7248   return cmd;) 78.6333 Tj
0 -493.6547 Td
(7249 }) 26.2111 Tj
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(Sheet 72) 34.9481 Tj
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(Aug  8 01:04 2009  xv6/sh.c  Page 9) 152.898 Tj
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(7250 struct cmd*) 69.8962 Tj
0 -37.9735 Td
(7251 parsepipe\(char **ps, char *es\)) 152.898 Tj
0 -47.4668 Td
(7252 {) 26.2111 Tj
0 -56.9602 Td
(7253   struct cmd *cmd;) 100.4758 Tj
0 -66.4535 Td
(7254 ) 21.8426 Tj
0 -75.9469 Td
(7255   cmd = parseexec\(ps, es\);) 135.4239 Tj
0 -85.4403 Td
(7256   if\(peek\(ps, es, "|"\)\){) 126.6869 Tj
0 -94.9336 Td
(7257     gettoken\(ps, es, 0, 0\);) 139.7925 Tj
0 -104.427 Td
(7258     cmd = pipecmd\(cmd, parsepipe\(ps, es\)\);) 205.3202 Tj
0 -113.9203 Td
(7259   }) 34.9481 Tj
0 -123.4137 Td
(7260   return cmd;) 78.6333 Tj
0 -132.9071 Td
(7261 }) 26.2111 Tj
0 -142.4004 Td
(7262 ) 21.8426 Tj
0 -151.8938 Td
(7263 struct cmd*) 69.8962 Tj
0 -161.3871 Td
(7264 parseredirs\(struct cmd *cmd, char **ps, char *es\)) 235.8998 Tj
0 -170.8805 Td
(7265 {) 26.2111 Tj
0 -180.3739 Td
(7266   int tok;) 65.5277 Tj
0 -189.8672 Td
(7267   char *q, *eq;) 87.3703 Tj
0 -199.3606 Td
(7268 ) 21.8426 Tj
0 -208.8539 Td
(7269   while\(peek\(ps, es, "<>"\)\){) 144.161 Tj
0 -218.3473 Td
(7270     tok = gettoken\(ps, es, 0, 0\);) 166.0035 Tj
0 -227.8407 Td
(7271     if\(gettoken\(ps, es, &q, &eq\) != 'a'\)) 196.5831 Tj
0 -237.334 Td
(7272       panic\("missing file for redirection"\);) 214.0572 Tj
0 -246.8274 Td
(7273     switch\(tok\){) 91.7388 Tj
0 -256.3207 Td
(7274     case '<':) 78.6333 Tj
0 -265.8141 Td
(7275       cmd = redircmd\(cmd, q, eq, O_RDONLY, 0\);) 222.7942 Tj
0 -275.3075 Td
(7276       break;) 74.2647 Tj
0 -284.8008 Td
(7277     case '>':) 78.6333 Tj
0 -294.2942 Td
(7278       cmd = redircmd\(cmd, q, eq, O_WRONLY|O_CREATE, 1\);) 262.1109 Tj
0 -303.7875 Td
(7279       break;) 74.2647 Tj
0 -313.2809 Td
(7280     case '+':  // >>) 109.2129 Tj
0 -322.7743 Td
(7281       cmd = redircmd\(cmd, q, eq, O_WRONLY|O_CREATE, 1\);) 262.1109 Tj
0 -332.2676 Td
(7282       break;) 74.2647 Tj
0 -341.761 Td
(7283     }) 43.6851 Tj
0 -351.2543 Td
(7284   }) 34.9481 Tj
0 -360.7477 Td
(7285   return cmd;) 78.6333 Tj
0 -370.2411 Td
(7286 }) 26.2111 Tj
0 -379.7344 Td
(7287 ) 21.8426 Tj
0 -389.2278 Td
(7288 ) 21.8426 Tj
0 -398.7211 Td
(7289 ) 21.8426 Tj
0 -408.2145 Td
(7290 ) 21.8426 Tj
0 -417.7079 Td
(7291 ) 21.8426 Tj
0 -427.2012 Td
(7292 ) 21.8426 Tj
0 -436.6946 Td
(7293 ) 21.8426 Tj
0 -446.1879 Td
(7294 ) 21.8426 Tj
0 -455.6813 Td
(7295 ) 21.8426 Tj
0 -465.1747 Td
(7296 ) 21.8426 Tj
0 -474.668 Td
(7297 ) 21.8426 Tj
0 -484.1614 Td
(7298 ) 21.8426 Tj
0 -493.6547 Td
(7299 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 72) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 80 80
%%BeginPageSetup
%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
0 j
0 J
10 M
1 w
/DeviceGray {} cs
[0] sc
/DeviceGray {} CS
[0] SC
false op
false OP
{} settransfer
0 0 612 792 re
W
q
q
[0.1 0 0 0.1 0 0] cm
q
180 3960 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/sh.c  Page 10) 157.2665 Tj
0 -28.4801 Td
(7300 struct cmd*) 69.8962 Tj
0 -37.9735 Td
(7301 parseblock\(char **ps, char *es\)) 157.2665 Tj
0 -47.4668 Td
(7302 {) 26.2111 Tj
0 -56.9602 Td
(7303   struct cmd *cmd;) 100.4758 Tj
0 -66.4535 Td
(7304 ) 21.8426 Tj
0 -75.9469 Td
(7305   if\(!peek\(ps, es, "\("\)\)) 126.6869 Tj
0 -85.4403 Td
(7306     panic\("parseblock"\);) 126.6869 Tj
0 -94.9336 Td
(7307   gettoken\(ps, es, 0, 0\);) 131.0554 Tj
0 -104.427 Td
(7308   cmd = parseline\(ps, es\);) 135.4239 Tj
0 -113.9203 Td
(7309   if\(!peek\(ps, es, "\)"\)\)) 126.6869 Tj
0 -123.4137 Td
(7310     panic\("syntax - missing \)"\);) 161.635 Tj
0 -132.9071 Td
(7311   gettoken\(ps, es, 0, 0\);) 131.0554 Tj
0 -142.4004 Td
(7312   cmd = parseredirs\(cmd, ps, es\);) 166.0035 Tj
0 -151.8938 Td
(7313   return cmd;) 78.6333 Tj
0 -161.3871 Td
(7314 }) 26.2111 Tj
0 -170.8805 Td
(7315 ) 21.8426 Tj
0 -180.3739 Td
(7316 struct cmd*) 69.8962 Tj
0 -189.8672 Td
(7317 parseexec\(char **ps, char *es\)) 152.898 Tj
0 -199.3606 Td
(7318 {) 26.2111 Tj
0 -208.8539 Td
(7319   char *q, *eq;) 87.3703 Tj
0 -218.3473 Td
(7320   int tok, argc;) 91.7388 Tj
0 -227.8407 Td
(7321   struct execcmd *cmd;) 117.9499 Tj
0 -237.334 Td
(7322   struct cmd *ret;) 100.4758 Tj
0 -246.8274 Td
(7323 ) 21.8426 Tj
0 -256.3207 Td
(7324   if\(peek\(ps, es, "\("\)\)) 122.3184 Tj
0 -265.8141 Td
(7325     return parseblock\(ps, es\);) 152.898 Tj
0 -275.3075 Td
(7326 ) 21.8426 Tj
0 -284.8008 Td
(7327   ret = execcmd\(\);) 100.4758 Tj
0 -294.2942 Td
(7328   cmd = \(struct execcmd*\)ret;) 148.5295 Tj
0 -303.7875 Td
(7329 ) 21.8426 Tj
0 -313.2809 Td
(7330   argc = 0;) 69.8962 Tj
0 -322.7743 Td
(7331   ret = parseredirs\(ret, ps, es\);) 166.0035 Tj
0 -332.2676 Td
(7332   while\(!peek\(ps, es, "|\)&;"\)\){) 157.2665 Tj
0 -341.761 Td
(7333     if\(\(tok=gettoken\(ps, es, &q, &eq\)\) == 0\)) 214.0572 Tj
0 -351.2543 Td
(7334       break;) 74.2647 Tj
0 -360.7477 Td
(7335     if\(tok != 'a'\)) 100.4758 Tj
0 -370.2411 Td
(7336       panic\("syntax"\);) 117.9499 Tj
0 -379.7344 Td
(7337     cmd->argv[argc] = q;) 126.6869 Tj
0 -389.2278 Td
(7338     cmd->eargv[argc] = eq;) 135.4239 Tj
0 -398.7211 Td
(7339     argc++;) 69.8962 Tj
0 -408.2145 Td
(7340     if\(argc >= MAXARGS\)) 122.3184 Tj
0 -417.7079 Td
(7341       panic\("too many args"\);) 148.5295 Tj
0 -427.2012 Td
(7342     ret = parseredirs\(ret, ps, es\);) 174.7406 Tj
0 -436.6946 Td
(7343   }) 34.9481 Tj
0 -446.1879 Td
(7344   cmd->argv[argc] = 0;) 117.9499 Tj
0 -455.6813 Td
(7345   cmd->eargv[argc] = 0;) 122.3184 Tj
0 -465.1747 Td
(7346   return ret;) 78.6333 Tj
0 -474.668 Td
(7347 }) 26.2111 Tj
0 -484.1614 Td
(7348 ) 21.8426 Tj
0 -493.6547 Td
(7349 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 73) 34.9481 Tj
Q
Q
q
180 500 5760 3460 re
W
/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
[0] sc
q
[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
0 0 Td
[0 -0.9679 1 0 564.72 392.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(Aug  8 01:04 2009  xv6/sh.c  Page 11) 157.2665 Tj
0 -28.4801 Td
(7350 // NUL-terminate all the counted strings.) 200.9517 Tj
0 -37.9735 Td
(7351 struct cmd*) 69.8962 Tj
0 -47.4668 Td
(7352 nulterminate\(struct cmd *cmd\)) 148.5295 Tj
0 -56.9602 Td
(7353 {) 26.2111 Tj
0 -66.4535 Td
(7354   int i;) 56.7907 Tj
0 -75.9469 Td
(7355   struct backcmd *bcmd;) 122.3184 Tj
0 -85.4403 Td
(7356   struct execcmd *ecmd;) 122.3184 Tj
0 -94.9336 Td
(7357   struct listcmd *lcmd;) 122.3184 Tj
0 -104.427 Td
(7358   struct pipecmd *pcmd;) 122.3184 Tj
0 -113.9203 Td
(7359   struct redircmd *rcmd;) 126.6869 Tj
0 -123.4137 Td
(7360 ) 21.8426 Tj
0 -132.9071 Td
(7361   if\(cmd == 0\)) 83.0018 Tj
0 -142.4004 Td
(7362     return 0;) 78.6333 Tj
0 -151.8938 Td
(7363 ) 21.8426 Tj
0 -161.3871 Td
(7364   switch\(cmd->type\){) 109.2129 Tj
0 -170.8805 Td
(7365   case EXEC:) 74.2647 Tj
0 -180.3739 Td
(7366     ecmd = \(struct execcmd*\)cmd;) 161.635 Tj
0 -189.8672 Td
(7367     for\(i=0; ecmd->argv[i]; i++\)) 161.635 Tj
0 -199.3606 Td
(7368       *ecmd->eargv[i] = 0;) 135.4239 Tj
0 -208.8539 Td
(7369     break;) 65.5277 Tj
0 -218.3473 Td
(7370 ) 21.8426 Tj
0 -227.8407 Td
(7371   case REDIR:) 78.6333 Tj
0 -237.334 Td
(7372     rcmd = \(struct redircmd*\)cmd;) 166.0035 Tj
0 -246.8274 Td
(7373     nulterminate\(rcmd->cmd\);) 144.161 Tj
0 -256.3207 Td
(7374     *rcmd->efile = 0;) 113.5814 Tj
0 -265.8141 Td
(7375     break;) 65.5277 Tj
0 -275.3075 Td
(7376 ) 21.8426 Tj
0 -284.8008 Td
(7377   case PIPE:) 74.2647 Tj
0 -294.2942 Td
(7378     pcmd = \(struct pipecmd*\)cmd;) 161.635 Tj
0 -303.7875 Td
(7379     nulterminate\(pcmd->left\);) 148.5295 Tj
0 -313.2809 Td
(7380     nulterminate\(pcmd->right\);) 152.898 Tj
0 -322.7743 Td
(7381     break;) 65.5277 Tj
0 -332.2676 Td
(7382 ) 21.8426 Tj
0 -341.761 Td
(7383   case LIST:) 74.2647 Tj
0 -351.2543 Td
(7384     lcmd = \(struct listcmd*\)cmd;) 161.635 Tj
0 -360.7477 Td
(7385     nulterminate\(lcmd->left\);) 148.5295 Tj
0 -370.2411 Td
(7386     nulterminate\(lcmd->right\);) 152.898 Tj
0 -379.7344 Td
(7387     break;) 65.5277 Tj
0 -389.2278 Td
(7388 ) 21.8426 Tj
0 -398.7211 Td
(7389   case BACK:) 74.2647 Tj
0 -408.2145 Td
(7390     bcmd = \(struct backcmd*\)cmd;) 161.635 Tj
0 -417.7079 Td
(7391     nulterminate\(bcmd->cmd\);) 144.161 Tj
0 -427.2012 Td
(7392     break;) 65.5277 Tj
0 -436.6946 Td
(7393   }) 34.9481 Tj
0 -446.1879 Td
(7394   return cmd;) 78.6333 Tj
0 -455.6813 Td
(7395 }) 26.2111 Tj
0 -465.1747 Td
(7396 ) 21.8426 Tj
0 -474.668 Td
(7397 ) 21.8426 Tj
0 -484.1614 Td
(7398 ) 21.8426 Tj
0 -493.6547 Td
(7399 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 73) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Trailer
end
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