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xpdf begin
%%BeginResource: font YLWBJI+LucidaSans-Typewriter83
%!FontType1-1.0: YLWBJI+LucidaSans-Typewriter83
12 dict begin
/FontInfo 10 dict dup begin
/Notice (Copyright (c) 1991 Bigelow & Holmes Inc. and Y&Y, Inc. (508) 371-3286. All Rights Reserved.) readonly def
/FullName (Lucida Sans Typewriter 83) readonly def
/FamilyName (LucidaSansTypewriter83) readonly def
/isFixedPitch true def
/ItalicAngle 0 def
/UnderlinePosition 0 def
/UnderlineThickness 0 def
end readonly def
/FontName /YLWBJI+LucidaSans-Typewriter83 def
/PaintType 0 def
/FontType 1 def
/FontMatrix [0.00083333 0 0 0.00083333 0 0] readonly def
/FontBBox [0 -205 602 783] readonly def
/StrokeWidth 0 def
/Encoding 256 array
0 1 255 {1 index exch /.notdef put} for
dup 32 /space put
dup 33 /exclam put
dup 34 /quotedbl put
dup 35 /numbersign put
dup 36 /dollar put
dup 37 /percent put
dup 38 /ampersand put
dup 39 /quoteright put
dup 40 /parenleft put
dup 41 /parenright put
dup 42 /asterisk put
dup 43 /plus put
dup 44 /comma put
dup 45 /minus put
dup 46 /period put
dup 47 /slash put
dup 48 /zero put
dup 49 /one put
dup 50 /two put
dup 51 /three put
dup 52 /four put
dup 53 /five put
dup 54 /six put
dup 55 /seven put
dup 56 /eight put
dup 57 /nine put
dup 58 /colon put
dup 59 /semicolon put
dup 60 /less put
dup 61 /equal put
dup 62 /greater put
dup 63 /question put
dup 64 /at put
dup 65 /A put
dup 66 /B put
dup 67 /C put
dup 68 /D put
dup 69 /E put
dup 70 /F put
dup 71 /G put
dup 72 /H put
dup 73 /I put
dup 74 /J put
dup 75 /K put
dup 76 /L put
dup 77 /M put
dup 78 /N put
dup 79 /O put
dup 80 /P put
dup 81 /Q put
dup 82 /R put
dup 83 /S put
dup 84 /T put
dup 85 /U put
dup 86 /V put
dup 87 /W put
dup 88 /X put
dup 89 /Y put
dup 90 /Z put
dup 91 /bracketleft put
dup 92 /backslash put
dup 93 /bracketright put
dup 94 /asciicircum put
dup 95 /underscore put
dup 96 /quoteleft put
dup 97 /a put
dup 98 /b put
dup 99 /c put
dup 100 /d put
dup 101 /e put
dup 102 /f put
dup 103 /g put
dup 104 /h put
dup 105 /i put
dup 106 /j put
dup 107 /k put
dup 108 /l put
dup 109 /m put
dup 110 /n put
dup 111 /o put
dup 112 /p put
dup 113 /q put
dup 114 /r put
dup 115 /s put
dup 116 /t put
dup 117 /u put
dup 118 /v put
dup 119 /w put
dup 120 /x put
dup 121 /y put
dup 122 /z put
dup 123 /braceleft put
dup 124 /bar put
dup 125 /braceright put
dup 126 /asciitilde put
readonly def
currentdict end
currentfile eexec
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(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\
.) 279.5849 Tj
0 -265.8136 Td
(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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/F8_0 8.7022 Tf
(Aug 8 01:04 2009 table of contents Page 1) 192.2146 Tj
0 -28.4801 Td
(The numbers to the left of the file names in the table are shee\
t numbers.) 318.9016 Tj
0 -37.9735 Td
(The source code has been printed in a double column format with\
fifty) 301.4275 Tj
0 -47.4668 Td
(lines per column, giving one hundred lines per sheet \(or page\)\
.) 275.2164 Tj
0 -56.9602 Td
(Thus there is a convenient relationship between line numbers an\
d sheet numbers.) 345.1126 Tj
0 -85.4403 Td
(# basic headers) 65.5277 Tj
209.536 -85.4403 Td
(51 pipe.c) 39.3166 Tj
0 -94.9336 Td
(01 types.h) 43.6851 Tj
-7022.54 TJm
(# system calls) 61.1592 Tj
0 -104.427 Td
(01 param.h) 43.6851 Tj
-7022.54 TJm
(24 traps.h) 43.6851 Tj
-7022.54 TJm
(# string operations) 83.0018 Tj
0 -113.9204 Td
(02 defs.h) 39.3166 Tj
-7524.2 TJm
(24 vectors.pl) 56.7907 Tj
-5517.54 TJm
(53 string.c) 48.0537 Tj
0 -123.4137 Td
(04 x86.h) 34.9481 Tj
-8025.87 TJm
(25 trapasm.S) 52.4222 Tj
0 -132.9071 Td
(06 asm.h) 34.9481 Tj
-8025.87 TJm
(25 trap.c) 39.3166 Tj
-7524.2 TJm
(# low-level hardware) 87.3703 Tj
0 -142.4004 Td
(06 mmu.h) 34.9481 Tj
-8025.87 TJm
(27 syscall.h) 52.4222 Tj
-6019.2 TJm
(54 mp.h) 30.5796 Tj
0 -151.8938 Td
(08 elf.h) 34.9481 Tj
-8025.87 TJm
(27 syscall.c) 52.4222 Tj
-6019.2 TJm
(55 mp.c) 30.5796 Tj
104.768 -161.3872 Td
(29 sysproc.c) 52.4222 Tj
-6019.2 TJm
(56 lapic.c) 43.6851 Tj
0 -170.8805 Td
(# startup) 39.3166 Tj
209.536 -170.8805 Td
(58 ioapic.c) 48.0537 Tj
0 -180.3739 Td
(09 bootasm.S) 52.4222 Tj
-6019.2 TJm
(# file system) 56.7907 Tj
-5517.54 TJm
(59 picirq.c) 48.0537 Tj
0 -189.8672 Td
(10 bootother.S) 61.1592 Tj
-5015.87 TJm
(30 buf.h) 34.9481 Tj
-8025.87 TJm
(61 kbd.h) 34.9481 Tj
0 -199.3606 Td
(11 bootmain.c) 56.7907 Tj
-5517.54 TJm
(30 fcntl.h) 43.6851 Tj
-7022.54 TJm
(62 kbd.c) 34.9481 Tj
0 -208.854 Td
(12 main.c) 39.3166 Tj
-7524.2 TJm
(31 stat.h) 39.3166 Tj
-7524.2 TJm
(63 console.c) 52.4222 Tj
104.768 -218.3473 Td
(31 fs.h) 30.5796 Tj
-8527.54 TJm
(66 timer.c) 43.6851 Tj
0 -227.8407 Td
(# locks) 30.5796 Tj
-8527.54 TJm
(32 file.h) 39.3166 Tj
0 -237.334 Td
(13 spinlock.h) 56.7907 Tj
-5517.54 TJm
(33 ide.c) 34.9481 Tj
-8025.87 TJm
(# user-level) 52.4222 Tj
0 -246.8274 Td
(13 spinlock.c) 56.7907 Tj
-5517.54 TJm
(35 bio.c) 34.9481 Tj
-8025.87 TJm
(67 initcode.S) 56.7907 Tj
104.768 -256.3208 Td
(36 fs.c) 30.5796 Tj
-8527.54 TJm
(67 usys.S) 39.3166 Tj
0 -265.8141 Td
(# processes) 48.0537 Tj
-6520.87 TJm
(44 file.c) 39.3166 Tj
-7524.2 TJm
(68 init.c) 39.3166 Tj
0 -275.3075 Td
(15 proc.h) 39.3166 Tj
-7524.2 TJm
(45 sysfile.c) 52.4222 Tj
-6019.2 TJm
(68 sh.c) 30.5796 Tj
0 -284.8008 Td
(16 proc.c) 39.3166 Tj
-7524.2 TJm
(50 exec.c) 39.3166 Tj
0 -294.2942 Td
(22 swtch.S) 43.6851 Tj
0 -303.7876 Td
(22 kalloc.c) 48.0537 Tj
-6520.87 TJm
(# pipes) 30.5796 Tj
0 -332.2673 Td
(The source listing is preceded by a cross-reference that lists \
every defined ) 336.3756 Tj
0 -341.7606 Td
(constant, struct, global variable, and function in xv6. Each e\
ntry gives,) 323.2701 Tj
0 -351.254 Td
(on the same line as the name, the line number \(or, in a few ca\
ses, numbers\)) 327.6386 Tj
0 -360.7473 Td
(where the name is defined. Successive lines in an entry list t\
he line) 305.796 Tj
0 -370.2407 Td
(numbers where the name is used. For example, this entry:) 249.0053 Tj
17.4613 -389.2274 Td
(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
-0 -427.2008 Td
(indicates that swtch is defined on line 2256 and is mentioned o\
n five lines) 327.6386 Tj
-0 -436.6942 Td
(on sheets 03, 19, and 22.) 109.2129 Tj
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(Aug 8 01:04 2009 cross-references Page 1) 187.8461 Tj
0 -28.4801 Td
(acquire 1373) 52.4222 Tj
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17.4613 -37.9735 Td
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17.4613 -94.9313 Td
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17.4613 -113.9172 Td
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(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
[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 7) 187.8461 Tj
0 -28.4801 Td
(mpioapic 5439) 56.7907 Tj
-11537.1 TJm
(NINDIRECT 3168) 61.1592 Tj
17.4613 -37.9735 Td
(5439 5607 5627 5629) 83.0018 Tj
-8527.14 TJm
(3168 3169 4022 4070) 83.0018 Tj
0 -47.4664 Td
(MPIOAPIC 5453) 56.7907 Tj
-11537.1 TJm
(NINODE 0157) 48.0537 Tj
17.4613 -56.9598 Td
(5453 5626) 39.3166 Tj
-13543.8 TJm
(0157 3785 3861) 61.1592 Tj
0 -66.4531 Td
(MPIOINTR 5454) 56.7907 Tj
-11537.1 TJm
(NO 6106) 30.5796 Tj
17.4613 -75.9465 Td
(5454 5632) 39.3166 Tj
-13543.8 TJm
(6106 6152 6155 6157) 83.0018 Tj
0 -85.4399 Td
(MPLINTR 5455) 52.4222 Tj
-14045.3 TJm
(6158 6159 6160 6162) 83.0018 Tj
17.4613 -94.9332 Td
(5455 5633) 39.3166 Tj
-13543.8 TJm
(6174 6177 6179 6180) 83.0018 Tj
0 -104.4266 Td
(mpmain 1253) 48.0537 Tj
-14547 TJm
(6181 6182 6184 6202) 83.0018 Tj
17.4613 -113.9199 Td
(1211 1239 1253 1258) 83.0018 Tj
-8527.14 TJm
(6203 6205 6206 6207) 83.0018 Tj
17.4613 -123.4133 Td
(1285) 17.4741 Tj
-16052.1 TJm
(6208) 17.4741 Tj
0 -132.9067 Td
(mpproc 5428) 48.0537 Tj
-12540.5 TJm
(NOFILE 0154) 48.0537 Tj
17.4613 -142.4 Td
(5428 5606 5619 5624) 83.0018 Tj
-8527.14 TJm
(0154 1540 1878 2113) 83.0018 Tj
0 -151.8934 Td
(MPPROC 5451) 48.0537 Tj
-14547 TJm
(4570 4586) 39.3166 Tj
17.4613 -161.3867 Td
(5451 5618) 39.3166 Tj
-11537.3 TJm
(NPROC 0150) 43.6851 Tj
0 -170.8801 Td
(mpsearch 5556) 56.7907 Tj
-13543.7 TJm
(0150 1610 1669 1760) 83.0018 Tj
17.4613 -180.3735 Td
(5556 5585) 39.3166 Tj
-13543.8 TJm
(1918 2057 2080 2129) 83.0018 Tj
0 -189.8664 Td
(mpsearch1 5537) 61.1592 Tj
-13042 TJm
(2162) 17.4741 Tj
17.4613 -199.3598 Td
(5537 5564 5568 5571) 83.0018 Tj
-6520.6 TJm
(NSEGS 1508) 43.6851 Tj
0 -208.8532 Td
(namecmp 4203) 52.4222 Tj
-14045.3 TJm
(1508 1561) 39.3166 Tj
17.4613 -218.3465 Td
(0244 4203 4228 4765) 83.0018 Tj
-6520.6 TJm
(nulterminate 7352) 74.2647 Tj
0 -227.8399 Td
(namei 4389) 43.6851 Tj
-15048.7 TJm
(7215 7230 7352 7373) 83.0018 Tj
17.4613 -237.3332 Td
(0245 1826 4389 4670) 83.0018 Tj
-8527.14 TJm
(7379 7380 7385 7386) 83.0018 Tj
17.4613 -246.8266 Td
(4865 4935 5021) 61.1592 Tj
-11035.5 TJm
(7391) 17.4741 Tj
0 -256.32 Td
(nameiparent 4396) 69.8962 Tj
-10032.1 TJm
(NUMLOCK 6113) 52.4222 Tj
17.4613 -265.8133 Td
(0246 4354 4369 4381) 83.0018 Tj
-8527.14 TJm
(6113 6146) 39.3166 Tj
17.4613 -275.3067 Td
(4396 4681 4760 4807) 83.0018 Tj
-6520.6 TJm
(O_CREATE 3053) 56.7907 Tj
0 -284.8 Td
(namex 4354) 43.6851 Tj
-15048.7 TJm
(3053 4861 7278 7281) 83.0018 Tj
17.4613 -294.2934 Td
(4354 4392 4398) 61.1592 Tj
-9028.94 TJm
(O_RDONLY 3050) 56.7907 Tj
0 -303.7868 Td
(NBUF 0156) 39.3166 Tj
-15550.3 TJm
(3050 4868 7275) 61.1592 Tj
17.4613 -313.2801 Td
(0156 3531 3553) 61.1592 Tj
-9028.94 TJm
(O_RDWR 3052) 48.0537 Tj
0 -322.7735 Td
(ncpu 5515) 39.3166 Tj
-15550.3 TJm
(3052 4886 6814 6816) 83.0018 Tj
17.4613 -332.2664 Td
(1224 1278 1569 3357) 83.0018 Tj
-8527.14 TJm
(7007) 17.4741 Tj
17.4613 -341.7598 Td
(5515 5609 5620 5622) 83.0018 Tj
-6520.6 TJm
(outb 0421) 39.3166 Tj
17.4613 -351.2532 Td
(5623) 17.4741 Tj
-16052.1 TJm
(0421 0933 0941 1164) 83.0018 Tj
0 -360.7465 Td
(NCPU 0153) 39.3166 Tj
-15550.3 TJm
(1165 1166 1167 1168) 83.0018 Tj
17.4613 -370.2399 Td
(0153 1568 5512) 61.1592 Tj
-11035.5 TJm
(1169 3361 3370 3381) 83.0018 Tj
0 -379.7332 Td
(NDEV 0158) 39.3166 Tj
-15550.3 TJm
(3382 3383 3384 3385) 83.0018 Tj
17.4613 -389.2266 Td
(0158 4108 4158 4406) 83.0018 Tj
-8527.14 TJm
(3386 3388 3391 5645) 83.0018 Tj
0 -398.72 Td
(NDIRECT 3167) 52.4222 Tj
-14045.3 TJm
(5646 5813 5814 5970) 83.0018 Tj
17.4613 -408.2133 Td
(3167 3169 3178 3274) 83.0018 Tj
-8527.14 TJm
(5971 5985 5986 5994) 83.0018 Tj
17.4613 -417.7067 Td
(4015 4020 4024 4025) 83.0018 Tj
-8527.14 TJm
(5997 6002 6012 6015) 83.0018 Tj
17.4613 -427.2 Td
(4060 4067 4068 4075) 83.0018 Tj
-8527.14 TJm
(6016 6017 6020 6026) 83.0018 Tj
17.4613 -436.6934 Td
(4076) 17.4741 Tj
-16052.1 TJm
(6027 6029 6030 6460) 83.0018 Tj
0 -446.1868 Td
(NELEM 0362) 43.6851 Tj
-15048.7 TJm
(6462 6479 6480 6481) 83.0018 Tj
17.4613 -455.6801 Td
(0362 1672 2879 4961) 83.0018 Tj
-8527.14 TJm
(6482 6677 6678 6679) 83.0018 Tj
0 -465.1735 Td
(nextpid 1615) 52.4222 Tj
-12038.8 TJm
(outsl 0433) 43.6851 Tj
17.4613 -474.6665 Td
(1615 1768) 39.3166 Tj
-13543.8 TJm
(0433 0435 3389) 61.1592 Tj
0 -484.1598 Td
(NFILE 0155) 43.6851 Tj
-13042.1 TJm
(outw 0427) 39.3166 Tj
17.4613 -493.6532 Td
(0155 4409 4425) 61.1592 Tj
-11035.5 TJm
(0427 0982 0984 1082) 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 8) 187.8461 Tj
17.4613 -28.4801 Td
(1084) 17.4741 Tj
-14045.6 TJm
(picsetmask 5967) 65.5277 Tj
0 -37.9735 Td
(O_WRONLY 3051) 56.7907 Tj
-13543.7 TJm
(5967 5977 6033) 61.1592 Tj
17.4613 -47.4664 Td
(3051 4885 4886 7278) 83.0018 Tj
-6520.6 TJm
(pinit 1620) 43.6851 Tj
17.4613 -56.9598 Td
(7281) 17.4741 Tj
-16052.1 TJm
(0306 1227 1620) 61.1592 Tj
0 -66.4531 Td
(PAGE 0151) 39.3166 Tj
-13543.8 TJm
(pipe 5160) 39.3166 Tj
17.4613 -75.9465 Td
(0151 0152 1811 2284) 83.0018 Tj
-8527.14 TJm
(0204 0288 0289 0290) 83.0018 Tj
17.4613 -85.4399 Td
(2285 2309 2359 5054) 83.0018 Tj
-8527.14 TJm
(3255 4469 4509 4529) 83.0018 Tj
17.4613 -94.9332 Td
(5057 5178 5202 5223) 83.0018 Tj
-8527.14 TJm
(5160 5172 5178 5184) 83.0018 Tj
0 -104.4266 Td
(panic 6401 7032) 65.5277 Tj
-12540.3 TJm
(5188 5192 5211 5230) 83.0018 Tj
17.4613 -113.9199 Td
(0219 1377 1405 1469) 83.0018 Tj
-8527.14 TJm
(5251 6763 6952 6953) 83.0018 Tj
17.4613 -123.4133 Td
(1471 1958 1960 1962) 83.0018 Tj
-6520.6 TJm
(PIPE 6859) 39.3166 Tj
17.4613 -132.9067 Td
(1964 2006 2009 2110) 83.0018 Tj
-8527.14 TJm
(6859 6950 7086 7377) 83.0018 Tj
17.4613 -142.4 Td
(2140 2310 2321 2360) 83.0018 Tj
-6520.6 TJm
(pipealloc 5170) 61.1592 Tj
17.4613 -151.8934 Td
(2647 3378 3459 3461) 83.0018 Tj
-8527.14 TJm
(0287 4984 5170) 61.1592 Tj
17.4613 -161.3867 Td
(3463 3596 3617 3627) 83.0018 Tj
-6520.6 TJm
(pipeclose 5211) 61.1592 Tj
17.4613 -170.8801 Td
(3725 3743 3822 3873) 83.0018 Tj
-8527.14 TJm
(0288 4469 5211) 61.1592 Tj
17.4613 -180.3735 Td
(3908 3928 3937 3958) 83.0018 Tj
-6520.6 TJm
(pipecmd 6884 7080) 74.2647 Tj
17.4613 -189.8668 Td
(4036 4219 4267 4275) 83.0018 Tj
-8527.14 TJm
(6884 6912 6951 7080) 83.0018 Tj
17.4613 -199.3602 Td
(4442 4458 4517 4537) 83.0018 Tj
-8527.14 TJm
(7082 7258 7358 7378) 83.0018 Tj
17.4613 -208.8535 Td
(4709 4777 4786 4821) 83.0018 Tj
-6520.6 TJm
(piperead 5251) 56.7907 Tj
17.4613 -218.3469 Td
(4834 4838 5638 6401) 83.0018 Tj
-8527.14 TJm
(0289 4509 5251) 61.1592 Tj
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(3101 4814 4862) 61.1592 Tj
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(SYS_mknod 2711) 61.1592 Tj
-13042 TJm
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17.4613 -189.8664 Td
(2711 2862) 39.3166 Tj
-13543.8 TJm
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(sys_open 4851) 56.7907 Tj
-13543.7 TJm
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17.4613 -208.8532 Td
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-9028.94 TJm
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-13543.7 TJm
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-11537.3 TJm
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-13543.7 TJm
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17.4613 -246.8266 Td
(2842 2864 4976) 61.1592 Tj
-9028.94 TJm
(TIMER_16BIT 6671) 69.8962 Tj
0 -256.32 Td
(SYS_pipe 2704) 56.7907 Tj
-13543.7 TJm
(6671 6677) 39.3166 Tj
17.4613 -265.8133 Td
(2704 2864) 39.3166 Tj
-11537.3 TJm
(TIMER_DIV 6666) 61.1592 Tj
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(sys_read 4615) 56.7907 Tj
-13543.7 TJm
(6666 6678 6679) 61.1592 Tj
17.4613 -284.8 Td
(2843 2865 4615) 61.1592 Tj
-9028.94 TJm
(TIMER_FREQ 6665) 65.5277 Tj
0 -294.2934 Td
(SYS_read 2706) 56.7907 Tj
-13543.7 TJm
(6665 6666) 39.3166 Tj
17.4613 -303.7868 Td
(2706 2865) 39.3166 Tj
-11537.3 TJm
(timerinit 6674) 61.1592 Tj
0 -313.2801 Td
(sys_sbrk 2951) 56.7907 Tj
-13543.7 TJm
(0347 1234 6674) 61.1592 Tj
17.4613 -322.7735 Td
(2844 2866 2951) 61.1592 Tj
-9028.94 TJm
(TIMER_MODE 6668) 65.5277 Tj
0 -332.2664 Td
(SYS_sbrk 2719) 56.7907 Tj
-13543.7 TJm
(6668 6677) 39.3166 Tj
17.4613 -341.7598 Td
(2719 2866) 39.3166 Tj
-11537.3 TJm
(TIMER_RATEGEN 6670) 78.6333 Tj
0 -351.2532 Td
(sys_sleep 2965) 61.1592 Tj
-13042 TJm
(6670 6677) 39.3166 Tj
17.4613 -360.7465 Td
(2845 2867 2965) 61.1592 Tj
-9028.94 TJm
(TIMER_SEL0 6669) 65.5277 Tj
0 -370.2399 Td
(SYS_sleep 2720) 61.1592 Tj
-13042 TJm
(6669 6677) 39.3166 Tj
17.4613 -379.7332 Td
(2720 2867) 39.3166 Tj
-11537.3 TJm
(T_IRQ0 2429) 48.0537 Tj
0 -389.2266 Td
(sys_unlink 4751) 65.5277 Tj
-12540.3 TJm
(2429 2614 2623 2627) 83.0018 Tj
17.4613 -398.72 Td
(2846 2868 4751) 61.1592 Tj
-11035.5 TJm
(2631 2635 2636 2663) 83.0018 Tj
0 -408.2133 Td
(SYS_unlink 2712) 65.5277 Tj
-12540.3 TJm
(5707 5714 5727 5917) 83.0018 Tj
17.4613 -417.7067 Td
(2712 2868) 39.3166 Tj
-13543.8 TJm
(5931 5997 6016) 61.1592 Tj
0 -427.2 Td
(sys_wait 2921) 56.7907 Tj
-11537.1 TJm
(TPR 5662) 34.9481 Tj
17.4613 -436.6934 Td
(2847 2869 2921) 61.1592 Tj
-11035.5 TJm
(5662 5743) 39.3166 Tj
0 -446.1868 Td
(SYS_wait 2703) 56.7907 Tj
-11537.1 TJm
(trap 2601) 39.3166 Tj
17.4613 -455.6801 Td
(2703 2869) 39.3166 Tj
-13543.8 TJm
(2452 2454 2524 2601) 83.0018 Tj
0 -465.1735 Td
(sys_write 4627) 61.1592 Tj
-13042 TJm
(2645 2647 2650) 61.1592 Tj
17.4613 -474.6665 Td
(2848 2870 4627) 61.1592 Tj
-9028.94 TJm
(trapframe 0552) 61.1592 Tj
0 -484.1598 Td
(SYS_write 2705) 61.1592 Tj
-13042 TJm
(0552 1536 1780 2601) 83.0018 Tj
17.4613 -493.6532 Td
(2705 2870) 39.3166 Tj
-11537.3 TJm
(trapret 2529) 52.4222 Tj
Q
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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 cross-references Page 12) 192.2146 Tj
17.4613 -28.4801 Td
(1617 1785 2528 2529) 83.0018 Tj
-6520.6 TJm
(waitdisk 1151) 56.7907 Tj
0 -37.9735 Td
(T_SYSCALL 2426) 61.1592 Tj
-13042 TJm
(1151 1163 1172) 61.1592 Tj
17.4613 -47.4664 Td
(2426 2572 2603 6712) 83.0018 Tj
-6520.6 TJm
(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
(5112) 17.4741 Tj
-16052.1 TJm
(2053 2067 2126 2133) 83.0018 Tj
0 -113.9199 Td
(userinit 1802) 56.7907 Tj
-11537.1 TJm
(writei 4152) 48.0537 Tj
17.4613 -123.4133 Td
(0312 1235 1802) 61.1592 Tj
-11035.5 TJm
(0249 4152 4274 4532) 83.0018 Tj
0 -132.9067 Td
(VER 5661) 34.9481 Tj
-16052 TJm
(4785 4786) 39.3166 Tj
17.4613 -142.4 Td
(5661 5723) 39.3166 Tj
-11537.3 TJm
(xchg 0501) 39.3166 Tj
0 -151.8934 Td
(wait 2153) 39.3166 Tj
-15550.3 TJm
(0501 1260 1382 1419) 83.0018 Tj
17.4613 -161.3867 Td
(0313 2153 2923 6762) 83.0018 Tj
-6520.6 TJm
(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
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[10 0 0 10 0 0] cm
[1 0 0 1 0 0] Tm
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[0 -0.9679 1 0 564.72 738.865] Tm
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(Aug 8 01:04 2009 xv6/types.h Page 1) 166.0035 Tj
0 -28.4801 Td
(0100 typedef unsigned int uint;) 144.161 Tj
0 -37.9735 Td
(0101 typedef unsigned short ushort;) 152.898 Tj
0 -47.4668 Td
(0102 typedef unsigned char uchar;) 148.5295 Tj
0 -56.9602 Td
(0103 ) 21.8426 Tj
0 -66.4535 Td
(0104 ) 21.8426 Tj
0 -75.9469 Td
(0105 ) 21.8426 Tj
0 -85.4403 Td
(0106 ) 21.8426 Tj
0 -94.9336 Td
(0107 ) 21.8426 Tj
0 -104.427 Td
(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
0 -170.8805 Td
(0115 ) 21.8426 Tj
0 -180.3739 Td
(0116 ) 21.8426 Tj
0 -189.8672 Td
(0117 ) 21.8426 Tj
0 -199.3606 Td
(0118 ) 21.8426 Tj
0 -208.8539 Td
(0119 ) 21.8426 Tj
0 -218.3473 Td
(0120 ) 21.8426 Tj
0 -227.8407 Td
(0121 ) 21.8426 Tj
0 -237.334 Td
(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
0 -303.7875 Td
(0129 ) 21.8426 Tj
0 -313.2809 Td
(0130 ) 21.8426 Tj
0 -322.7743 Td
(0131 ) 21.8426 Tj
0 -332.2676 Td
(0132 ) 21.8426 Tj
0 -341.761 Td
(0133 ) 21.8426 Tj
0 -351.2543 Td
(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
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180 500 5760 3460 re
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/DeviceGray {} CS
[0] SC
/DeviceGray {} cs
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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/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
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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
[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
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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/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
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0 0 612 792 re W
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[] 0 d
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/DeviceGray {} cs
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/DeviceGray {} CS
[0] SC
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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
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
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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/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
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0 0 612 792 re W
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[] 0 d
1 i
0 j
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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
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Q
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pdfEndPage
%%Page: 17 17
%%BeginPageSetup
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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/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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%%Page: 18 18
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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/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
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-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/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
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/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
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 20 20
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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
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 0 564.72 738.865] 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
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 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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pdfStartPage
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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
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{} 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/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
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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/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
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(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
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(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
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(Sheet 15) 34.9481 Tj
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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
0 -332.2676 Td
(1582 ) 21.8426 Tj
0 -341.761 Td
(1583 ) 21.8426 Tj
0 -351.2543 Td
(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
0 -493.6547 Td
(1599 ) 21.8426 Tj
0 -522.1348 Td
(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
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(Sheet 16) 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/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
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(1686 ) 21.8426 Tj
0 -379.7344 Td
(1687 ) 21.8426 Tj
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(1688 ) 21.8426 Tj
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(1689 ) 21.8426 Tj
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(1690 ) 21.8426 Tj
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(1691 ) 21.8426 Tj
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(1692 ) 21.8426 Tj
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(1693 ) 21.8426 Tj
0 -446.1879 Td
(1694 ) 21.8426 Tj
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(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
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(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
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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
/DeviceGray {} CS
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/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
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 6) 161.635 Tj
0 -28.4801 Td
(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
0 -66.4535 Td
(1854 fork\(void\)) 65.5277 Tj
0 -75.9469 Td
(1855 {) 26.2111 Tj
0 -85.4403 Td
(1856 int i, pid;) 78.6333 Tj
0 -94.9336 Td
(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
0 -189.8672 Td
(1867 np->kstack = 0;) 104.8443 Tj
0 -199.3606 Td
(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
0 -227.8407 Td
(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
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 26 26
%%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
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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
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 0 564.72 738.865] Tm
0 0 Td
/F8_0 8.7022 Tf
(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
0 -113.9203 Td
(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
0 -417.7079 Td
(1941 ) 21.8426 Tj
0 -427.2012 Td
(1942 ) 21.8426 Tj
0 -436.6946 Td
(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
0 -522.1348 Td
(Sheet 19) 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 8) 161.635 Tj
0 -28.4801 Td
(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
0 -522.1348 Td
(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
0 -522.1348 Td
(Sheet 20) 34.9481 Tj
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180 500 5760 3460 re
W
/DeviceGray {} CS
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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.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
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showpage
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0 0 Td
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(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
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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
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showpage
%%PageTrailer
pdfEndPage
%%Page: 29 29
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pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
[] 0 d
1 i
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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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(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
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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
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%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
Q
Q
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Q
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%%Page: 35 35
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%%PageOrientation: Landscape
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180 rotate
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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
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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/sysproc.c Page 1) 174.7406 Tj
0 -28.4801 Td
(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
0 -104.427 Td
(2908 sys_fork\(void\)) 83.0018 Tj
0 -113.9203 Td
(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
0 -161.3871 Td
(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
0 -227.8407 Td
(2921 sys_wait\(void\)) 83.0018 Tj
0 -237.334 Td
(2922 {) 26.2111 Tj
0 -246.8274 Td
(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
0 -341.761 Td
(2933 return kill\(pid\);) 104.8443 Tj
0 -351.2543 Td
(2934 }) 26.2111 Tj
0 -360.7477 Td
(2935 ) 21.8426 Tj
0 -370.2411 Td
(2936 int) 34.9481 Tj
0 -379.7344 Td
(2937 sys_getpid\(void\)) 91.7388 Tj
0 -389.2278 Td
(2938 {) 26.2111 Tj
0 -398.7211 Td
(2939 return cp->pid;) 96.1073 Tj
0 -408.2145 Td
(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
0 -455.6813 Td
(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
0 -522.1348 Td
(Sheet 29) 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/sysproc.c Page 2) 174.7406 Tj
0 -28.4801 Td
(2950 int) 34.9481 Tj
0 -37.9735 Td
(2951 sys_sbrk\(void\)) 83.0018 Tj
0 -47.4668 Td
(2952 {) 26.2111 Tj
0 -56.9602 Td
(2953 int addr;) 69.8962 Tj
0 -66.4535 Td
(2954 int n;) 56.7907 Tj
0 -75.9469 Td
(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
0 -104.427 Td
(2958 addr = cp->sz;) 91.7388 Tj
0 -113.9203 Td
(2959 if\(growproc\(n\) < 0\)) 113.5814 Tj
0 -123.4137 Td
(2960 return -1;) 83.0018 Tj
0 -132.9071 Td
(2961 return addr;) 83.0018 Tj
0 -142.4004 Td
(2962 }) 26.2111 Tj
0 -151.8938 Td
(2963 ) 21.8426 Tj
0 -161.3871 Td
(2964 int) 34.9481 Tj
0 -170.8805 Td
(2965 sys_sleep\(void\)) 87.3703 Tj
0 -180.3739 Td
(2966 {) 26.2111 Tj
0 -189.8672 Td
(2967 int n, ticks0;) 91.7388 Tj
0 -199.3606 Td
(2968 ) 21.8426 Tj
0 -208.8539 Td
(2969 if\(argint\(0, &n\) < 0\)) 122.3184 Tj
0 -218.3473 Td
(2970 return -1;) 83.0018 Tj
0 -227.8407 Td
(2971 acquire\(&tickslock\);) 117.9499 Tj
0 -237.334 Td
(2972 ticks0 = ticks;) 96.1073 Tj
0 -246.8274 Td
(2973 while\(ticks - ticks0 < n\){) 144.161 Tj
0 -256.3207 Td
(2974 if\(cp->killed\){) 104.8443 Tj
0 -265.8141 Td
(2975 release\(&tickslock\);) 135.4239 Tj
0 -275.3075 Td
(2976 return -1;) 91.7388 Tj
0 -284.8008 Td
(2977 }) 43.6851 Tj
0 -294.2942 Td
(2978 sleep\(&ticks, &tickslock\);) 152.898 Tj
0 -303.7875 Td
(2979 }) 34.9481 Tj
0 -313.2809 Td
(2980 release\(&tickslock\);) 117.9499 Tj
0 -322.7743 Td
(2981 return 0;) 69.8962 Tj
0 -332.2676 Td
(2982 }) 26.2111 Tj
0 -341.761 Td
(2983 ) 21.8426 Tj
0 -351.2543 Td
(2984 ) 21.8426 Tj
0 -360.7477 Td
(2985 ) 21.8426 Tj
0 -370.2411 Td
(2986 ) 21.8426 Tj
0 -379.7344 Td
(2987 ) 21.8426 Tj
0 -389.2278 Td
(2988 ) 21.8426 Tj
0 -398.7211 Td
(2989 ) 21.8426 Tj
0 -408.2145 Td
(2990 ) 21.8426 Tj
0 -417.7079 Td
(2991 ) 21.8426 Tj
0 -427.2012 Td
(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
0 -484.1614 Td
(2998 ) 21.8426 Tj
0 -493.6547 Td
(2999 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 29) 34.9481 Tj
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[] 0 d
1 i
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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/buf.h Page 1) 157.2665 Tj
0 -28.4801 Td
(3000 struct buf {) 74.2647 Tj
0 -37.9735 Td
(3001 int flags;) 74.2647 Tj
0 -47.4668 Td
(3002 uint dev;) 69.8962 Tj
0 -56.9602 Td
(3003 uint sector;) 83.0018 Tj
0 -66.4535 Td
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(3252 int ref; // reference count) 148.5295 Tj
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(3253 char readable;) 91.7388 Tj
0 -66.4535 Td
(3254 char writable;) 91.7388 Tj
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(3255 struct pipe *pipe;) 109.2129 Tj
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(3256 struct inode *ip;) 104.8443 Tj
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(3258 };) 30.5796 Tj
0 -113.9203 Td
(3259 ) 21.8426 Tj
0 -123.4137 Td
(3260 ) 21.8426 Tj
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(3261 // in-core file system types) 144.161 Tj
0 -142.4004 Td
(3262 ) 21.8426 Tj
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(3263 struct inode {) 83.0018 Tj
0 -161.3871 Td
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(3266 int ref; // Reference count) 196.5831 Tj
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(3267 int flags; // I_BUSY, I_VALID) 196.5831 Tj
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(3268 ) 21.8426 Tj
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0 -265.8141 Td
(3275 };) 30.5796 Tj
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(3276 ) 21.8426 Tj
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(3279 ) 21.8426 Tj
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(3280 ) 21.8426 Tj
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(3281 // device implementations) 131.0554 Tj
0 -332.2676 Td
(3282 ) 21.8426 Tj
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(3283 struct devsw {) 83.0018 Tj
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(3284 int \(*read\)\(struct inode*, char*, int\);) 200.9517 Tj
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(3285 int \(*write\)\(struct inode*, char*, int\);) 205.3202 Tj
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(3300 // Simple PIO-based \(non-DMA\) IDE driver code.) 222.7942 Tj
0 -37.9735 Td
(3301 ) 21.8426 Tj
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(3302 #include "types.h") 100.4758 Tj
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(3303 #include "defs.h") 96.1073 Tj
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(3304 #include "param.h") 100.4758 Tj
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(3305 #include "mmu.h") 91.7388 Tj
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(3306 #include "proc.h") 96.1073 Tj
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(3307 #include "x86.h") 91.7388 Tj
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(3308 #include "traps.h") 100.4758 Tj
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(3309 #include "spinlock.h") 113.5814 Tj
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(3310 #include "buf.h") 91.7388 Tj
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(3311 ) 21.8426 Tj
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(3312 #define IDE_BSY 0x80) 135.4239 Tj
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(3313 #define IDE_DRDY 0x40) 135.4239 Tj
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(3314 #define IDE_DF 0x20) 135.4239 Tj
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(3315 #define IDE_ERR 0x01) 135.4239 Tj
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(3316 ) 21.8426 Tj
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(3317 #define IDE_CMD_READ 0x20) 135.4239 Tj
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(3318 #define IDE_CMD_WRITE 0x30) 135.4239 Tj
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(3319 ) 21.8426 Tj
0 -218.3473 Td
(3320 // idequeue points to the buf now being read/written to th\
e disk.) 305.796 Tj
0 -227.8407 Td
(3321 // idequeue->qnext points to the next buf to be processed.) 275.2164 Tj
0 -237.334 Td
(3322 // You must hold idelock while manipulating queue.) 240.2683 Tj
0 -246.8274 Td
(3323 ) 21.8426 Tj
0 -256.3207 Td
(3324 static struct spinlock idelock;) 157.2665 Tj
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(3325 static struct buf *idequeue;) 144.161 Tj
0 -275.3075 Td
(3326 ) 21.8426 Tj
0 -284.8008 Td
(3327 static int havedisk1;) 113.5814 Tj
0 -294.2942 Td
(3328 static void idestart\(struct buf*\);) 170.3721 Tj
0 -303.7875 Td
(3329 ) 21.8426 Tj
0 -313.2809 Td
(3330 // Wait for IDE disk to become ready.) 183.4776 Tj
0 -322.7743 Td
(3331 static int) 65.5277 Tj
0 -332.2676 Td
(3332 idewait\(int checkerr\)) 113.5814 Tj
0 -341.761 Td
(3333 {) 26.2111 Tj
0 -351.2543 Td
(3334 int r;) 56.7907 Tj
0 -360.7477 Td
(3335 ) 21.8426 Tj
0 -370.2411 Td
(3336 while\(\(\(r = inb\(0x1f7\)\) & \(IDE_BSY|IDE_DRDY\)\) !\
= IDE_DRDY\)) 283.9534 Tj
0 -379.7344 Td
(3337 ;) 43.6851 Tj
0 -389.2278 Td
(3338 if\(checkerr && \(r & \(IDE_DF|IDE_ERR\)\) != 0\)) 218.4257 Tj
0 -398.7211 Td
(3339 return -1;) 83.0018 Tj
0 -408.2145 Td
(3340 return 0;) 69.8962 Tj
0 -417.7079 Td
(3341 }) 26.2111 Tj
0 -427.2012 Td
(3342 ) 21.8426 Tj
0 -436.6946 Td
(3343 ) 21.8426 Tj
0 -446.1879 Td
(3344 ) 21.8426 Tj
0 -455.6813 Td
(3345 ) 21.8426 Tj
0 -465.1747 Td
(3346 ) 21.8426 Tj
0 -474.668 Td
(3347 ) 21.8426 Tj
0 -484.1614 Td
(3348 ) 21.8426 Tj
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(3349 ) 21.8426 Tj
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(Aug 8 01:04 2009 xv6/ide.c Page 2) 157.2665 Tj
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(3350 void) 39.3166 Tj
0 -37.9735 Td
(3351 ideinit\(void\)) 78.6333 Tj
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(3352 {) 26.2111 Tj
0 -56.9602 Td
(3353 int i;) 56.7907 Tj
0 -66.4535 Td
(3354 ) 21.8426 Tj
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(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
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(3363 if\(inb\(0x1f7\) != 0\){) 126.6869 Tj
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(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
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(3370 outb\(0x1f6, 0xe0 | \(0<<4\)\);) 148.5295 Tj
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(3371 }) 26.2111 Tj
0 -237.334 Td
(3372 ) 21.8426 Tj
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(3373 // Start the request for b. Caller must hold idelock.) 257.7424 Tj
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(3374 static void) 69.8962 Tj
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(3375 idestart\(struct buf *b\)) 122.3184 Tj
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(3376 {) 26.2111 Tj
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(3377 if\(b == 0\)) 74.2647 Tj
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(3378 panic\("idestart"\);) 117.9499 Tj
0 -303.7875 Td
(3379 ) 21.8426 Tj
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(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
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(3387 if\(b->flags & B_DIRTY\){) 131.0554 Tj
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(3388 outb\(0x1f7, IDE_CMD_WRITE\);) 157.2665 Tj
0 -398.7211 Td
(3389 outsl\(0x1f0, b->data, 512/4\);) 166.0035 Tj
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(3390 } else {) 65.5277 Tj
0 -417.7079 Td
(3391 outb\(0x1f7, IDE_CMD_READ\);) 152.898 Tj
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(3392 }) 34.9481 Tj
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(3393 }) 26.2111 Tj
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(3395 ) 21.8426 Tj
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(3396 ) 21.8426 Tj
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(3397 ) 21.8426 Tj
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(3398 ) 21.8426 Tj
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(3399 ) 21.8426 Tj
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(3400 // Interrupt handler.) 113.5814 Tj
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(3401 void) 39.3166 Tj
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(3402 ideintr\(void\)) 78.6333 Tj
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(3404 struct buf *b;) 91.7388 Tj
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(3406 // Take first buffer off queue.) 166.0035 Tj
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(3407 acquire\(&idelock\);) 109.2129 Tj
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(3408 if\(\(b = idequeue\) == 0\){) 135.4239 Tj
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(3409 release\(&idelock\);) 117.9499 Tj
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(3410 cprintf\("Spurious IDE interrupt.\\n"\);) 200.9517 Tj
0 -132.9071 Td
(3411 return;) 69.8962 Tj
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(3412 }) 34.9481 Tj
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(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
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(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
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(3420 b->flags |= B_VALID;) 117.9499 Tj
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(3421 b->flags &= ~B_DIRTY;) 122.3184 Tj
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(3422 wakeup\(b\);) 74.2647 Tj
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(3423 ) 21.8426 Tj
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(3424 // Start disk on next buf in queue.) 183.4776 Tj
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(3426 idestart\(idequeue\);) 122.3184 Tj
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(3427 ) 21.8426 Tj
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(3428 release\(&idelock\);) 109.2129 Tj
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(3429 }) 26.2111 Tj
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(3430 ) 21.8426 Tj
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(3431 ) 21.8426 Tj
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(3434 ) 21.8426 Tj
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(3435 ) 21.8426 Tj
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(3436 ) 21.8426 Tj
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(3437 ) 21.8426 Tj
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(3438 ) 21.8426 Tj
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(3439 ) 21.8426 Tj
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(Aug 8 01:04 2009 xv6/ide.c Page 4) 157.2665 Tj
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(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
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(3464 ) 21.8426 Tj
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(3465 acquire\(&idelock\);) 109.2129 Tj
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(3466 ) 21.8426 Tj
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(3467 // Append b to idequeue.) 135.4239 Tj
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(3468 b->qnext = 0;) 87.3703 Tj
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(3469 for\(pp=&idequeue; *pp; pp=&\(*pp\)->qnext\)) 205.3202 Tj
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(3470 ;) 43.6851 Tj
0 -227.8407 Td
(3471 *pp = b;) 65.5277 Tj
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(3472 ) 21.8426 Tj
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(3473 // Start disk if necessary.) 148.5295 Tj
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(3474 if\(idequeue == b\)) 104.8443 Tj
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(3475 idestart\(b\);) 91.7388 Tj
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(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
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(3479 while\(\(b->flags & \(B_VALID|B_DIRTY\)\) != B_VALID\)) 240.2683 Tj
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(3500 // Buffer cache.) 91.7388 Tj
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(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
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(3505 // a synchronization point for disk blocks used by multipl\
e processes.) 327.6386 Tj
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(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
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(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
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(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
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(3513 // so do not keep them longer than necessary.) 235.8998 Tj
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(3514 //) 30.5796 Tj
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(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
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(3519 // with the associated disk block contents.) 227.1628 Tj
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(3520 // * B_DIRTY: the buffer data has been modified) 227.1628 Tj
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(3521 // and needs to be written to disk.) 192.2146 Tj
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(3526 #include "spinlock.h") 113.5814 Tj
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(3533 // Linked list of all buffers, through prev/next.) 244.6368 Tj
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(3534 // head.next is most recently used.) 183.4776 Tj
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(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
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180 500 5760 3460 re
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/DeviceGray {} CS
[0] SC
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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/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
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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
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(Sheet 36) 34.9481 Tj
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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/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
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0 0 Td
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(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
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180 500 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 0 564.72 392.865] 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
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(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
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0 0 Td
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(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
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(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
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(Sheet 39) 34.9481 Tj
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(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
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(3985 ) 21.8426 Tj
0 -370.2411 Td
(3986 ) 21.8426 Tj
0 -379.7344 Td
(3987 ) 21.8426 Tj
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(3988 ) 21.8426 Tj
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(3989 ) 21.8426 Tj
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(3992 ) 21.8426 Tj
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(3993 ) 21.8426 Tj
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(3994 ) 21.8426 Tj
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(3995 ) 21.8426 Tj
0 -465.1747 Td
(3996 ) 21.8426 Tj
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(3997 ) 21.8426 Tj
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(3998 ) 21.8426 Tj
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(3999 ) 21.8426 Tj
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(Sheet 39) 34.9481 Tj
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(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
0 -493.6547 Td
(4099 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 40) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 48 48
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%%PageOrientation: Landscape
pdfStartPage
180 rotate
-612 -792 translate
0 0 612 792 re W
%%EndPageSetup
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q
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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/fs.c Page 10) 157.2665 Tj
0 -28.4801 Td
(4100 // Read data from inode.) 126.6869 Tj
0 -37.9735 Td
(4101 int) 34.9481 Tj
0 -47.4668 Td
(4102 readi\(struct inode *ip, char *dst, uint off, uint n\)) 249.0053 Tj
0 -56.9602 Td
(4103 {) 26.2111 Tj
0 -66.4535 Td
(4104 uint tot, m;) 83.0018 Tj
0 -75.9469 Td
(4105 struct buf *bp;) 96.1073 Tj
0 -85.4403 Td
(4106 ) 21.8426 Tj
0 -94.9336 Td
(4107 if\(ip->type == T_DEV\){) 126.6869 Tj
0 -104.427 Td
(4108 if\(ip->major < 0 || ip->major >= NDEV || !devsw[ip->m\
ajor].read\)) 318.9016 Tj
0 -113.9203 Td
(4109 return -1;) 91.7388 Tj
0 -123.4137 Td
(4110 return devsw[ip->major].read\(ip, dst, n\);) 218.4257 Tj
0 -132.9071 Td
(4111 }) 34.9481 Tj
0 -142.4004 Td
(4112 ) 21.8426 Tj
0 -151.8938 Td
(4113 if\(off > ip->size || off + n < off\)) 183.4776 Tj
0 -161.3871 Td
(4114 return -1;) 83.0018 Tj
0 -170.8805 Td
(4115 if\(off + n > ip->size\)) 126.6869 Tj
0 -180.3739 Td
(4116 n = ip->size - off;) 122.3184 Tj
0 -189.8672 Td
(4117 ) 21.8426 Tj
0 -199.3606 Td
(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
0 -237.334 Td
(4122 brelse\(bp\);) 87.3703 Tj
0 -246.8274 Td
(4123 }) 34.9481 Tj
0 -256.3207 Td
(4124 return n;) 69.8962 Tj
0 -265.8141 Td
(4125 }) 26.2111 Tj
0 -275.3075 Td
(4126 ) 21.8426 Tj
0 -284.8008 Td
(4127 ) 21.8426 Tj
0 -294.2942 Td
(4128 ) 21.8426 Tj
0 -303.7875 Td
(4129 ) 21.8426 Tj
0 -313.2809 Td
(4130 ) 21.8426 Tj
0 -322.7743 Td
(4131 ) 21.8426 Tj
0 -332.2676 Td
(4132 ) 21.8426 Tj
0 -341.761 Td
(4133 ) 21.8426 Tj
0 -351.2543 Td
(4134 ) 21.8426 Tj
0 -360.7477 Td
(4135 ) 21.8426 Tj
0 -370.2411 Td
(4136 ) 21.8426 Tj
0 -379.7344 Td
(4137 ) 21.8426 Tj
0 -389.2278 Td
(4138 ) 21.8426 Tj
0 -398.7211 Td
(4139 ) 21.8426 Tj
0 -408.2145 Td
(4140 ) 21.8426 Tj
0 -417.7079 Td
(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
0 -474.668 Td
(4147 ) 21.8426 Tj
0 -484.1614 Td
(4148 ) 21.8426 Tj
0 -493.6547 Td
(4149 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 41) 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 11) 157.2665 Tj
0 -28.4801 Td
(4150 // Write data to inode.) 122.3184 Tj
0 -37.9735 Td
(4151 int) 34.9481 Tj
0 -47.4668 Td
(4152 writei\(struct inode *ip, char *src, uint off, uint n\)) 253.3738 Tj
0 -56.9602 Td
(4153 {) 26.2111 Tj
0 -66.4535 Td
(4154 uint tot, m;) 83.0018 Tj
0 -75.9469 Td
(4155 struct buf *bp;) 96.1073 Tj
0 -85.4403 Td
(4156 ) 21.8426 Tj
0 -94.9336 Td
(4157 if\(ip->type == T_DEV\){) 126.6869 Tj
0 -104.427 Td
(4158 if\(ip->major < 0 || ip->major >= NDEV || !devsw[ip->m\
ajor].write\)) 323.2701 Tj
0 -113.9203 Td
(4159 return -1;) 91.7388 Tj
0 -123.4137 Td
(4160 return devsw[ip->major].write\(ip, src, n\);) 222.7942 Tj
0 -132.9071 Td
(4161 }) 34.9481 Tj
0 -142.4004 Td
(4162 ) 21.8426 Tj
0 -151.8938 Td
(4163 if\(off > ip->size || off + n < off\)) 183.4776 Tj
0 -161.3871 Td
(4164 return -1;) 83.0018 Tj
0 -170.8805 Td
(4165 if\(off + n > MAXFILE*BSIZE\)) 148.5295 Tj
0 -180.3739 Td
(4166 n = MAXFILE*BSIZE - off;) 144.161 Tj
0 -189.8672 Td
(4167 ) 21.8426 Tj
0 -199.3606 Td
(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
0 -227.8407 Td
(4171 memmove\(bp->data + off%BSIZE, src, m\);) 205.3202 Tj
0 -237.334 Td
(4172 bwrite\(bp\);) 87.3703 Tj
0 -246.8274 Td
(4173 brelse\(bp\);) 87.3703 Tj
0 -256.3207 Td
(4174 }) 34.9481 Tj
0 -265.8141 Td
(4175 ) 21.8426 Tj
0 -275.3075 Td
(4176 if\(n > 0 && off > ip->size\){) 152.898 Tj
0 -284.8008 Td
(4177 ip->size = off;) 104.8443 Tj
0 -294.2942 Td
(4178 iupdate\(ip\);) 91.7388 Tj
0 -303.7875 Td
(4179 }) 34.9481 Tj
0 -313.2809 Td
(4180 return n;) 69.8962 Tj
0 -322.7743 Td
(4181 }) 26.2111 Tj
0 -332.2676 Td
(4182 ) 21.8426 Tj
0 -341.761 Td
(4183 ) 21.8426 Tj
0 -351.2543 Td
(4184 ) 21.8426 Tj
0 -360.7477 Td
(4185 ) 21.8426 Tj
0 -370.2411 Td
(4186 ) 21.8426 Tj
0 -379.7344 Td
(4187 ) 21.8426 Tj
0 -389.2278 Td
(4188 ) 21.8426 Tj
0 -398.7211 Td
(4189 ) 21.8426 Tj
0 -408.2145 Td
(4190 ) 21.8426 Tj
0 -417.7079 Td
(4191 ) 21.8426 Tj
0 -427.2012 Td
(4192 ) 21.8426 Tj
0 -436.6946 Td
(4193 ) 21.8426 Tj
0 -446.1879 Td
(4194 ) 21.8426 Tj
0 -455.6813 Td
(4195 ) 21.8426 Tj
0 -465.1747 Td
(4196 ) 21.8426 Tj
0 -474.668 Td
(4197 ) 21.8426 Tj
0 -484.1614 Td
(4198 ) 21.8426 Tj
0 -493.6547 Td
(4199 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 41) 34.9481 Tj
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 49 49
%%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 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/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
0 -56.9602 Td
(4203 namecmp\(const char *s, const char *t\)) 183.4776 Tj
0 -66.4535 Td
(4204 {) 26.2111 Tj
0 -75.9469 Td
(4205 return strncmp\(s, t, DIRSIZ\);) 157.2665 Tj
0 -85.4403 Td
(4206 }) 26.2111 Tj
0 -94.9336 Td
(4207 ) 21.8426 Tj
0 -104.427 Td
(4208 // Look for a directory entry in a directory.) 218.4257 Tj
0 -113.9203 Td
(4209 // If found, set *poff to byte offset of entry.) 227.1628 Tj
0 -123.4137 Td
(4210 // Caller must have already locked dp.) 187.8461 Tj
0 -132.9071 Td
(4211 struct inode*) 78.6333 Tj
0 -142.4004 Td
(4212 dirlookup\(struct inode *dp, char *name, uint *poff\)) 244.6368 Tj
0 -151.8938 Td
(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
0 -199.3606 Td
(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
0 -246.8274 Td
(4223 for\(de = \(struct dirent*\)bp->data;) 187.8461 Tj
0 -256.3207 Td
(4224 de < \(struct dirent*\)\(bp->data + BSIZE\);) 231.5313 Tj
0 -265.8141 Td
(4225 de++\){) 83.0018 Tj
0 -275.3075 Td
(4226 if\(de->inum == 0\)) 122.3184 Tj
0 -284.8008 Td
(4227 continue;) 96.1073 Tj
0 -294.2942 Td
(4228 if\(namecmp\(name, de->name\) == 0\){) 192.2146 Tj
0 -303.7875 Td
(4229 // entry matches path element) 183.4776 Tj
0 -313.2809 Td
(4230 if\(poff\)) 91.7388 Tj
0 -322.7743 Td
(4231 *poff = off + \(uchar*\)de - bp->data;) 222.7942 Tj
0 -332.2676 Td
(4232 inum = de->inum;) 126.6869 Tj
0 -341.761 Td
(4233 brelse\(bp\);) 104.8443 Tj
0 -351.2543 Td
(4234 return iget\(dp->dev, inum\);) 174.7406 Tj
0 -360.7477 Td
(4235 }) 52.4222 Tj
0 -370.2411 Td
(4236 }) 43.6851 Tj
0 -379.7344 Td
(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
0 -436.6946 Td
(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
0 -522.1348 Td
(Sheet 42) 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 13) 157.2665 Tj
0 -28.4801 Td
(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
0 -75.9469 Td
(4255 struct dirent de;) 104.8443 Tj
0 -85.4403 Td
(4256 struct inode *ip;) 104.8443 Tj
0 -94.9336 Td
(4257 ) 21.8426 Tj
0 -104.427 Td
(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
0 -199.3606 Td
(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
0 -246.8274 Td
(4273 de.inum = inum;) 96.1073 Tj
0 -256.3207 Td
(4274 if\(writei\(dp, \(char*\)&de, off, sizeof\(de\)\) != siz\
eof\(de\)\)) 279.5849 Tj
0 -265.8141 Td
(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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(Aug 8 01:04 2009 xv6/fs.c Page 15) 157.2665 Tj
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(4504 int r;) 56.7907 Tj
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0 -180.3739 Td
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0 -199.3606 Td
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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
0 -427.2012 Td
(4542 ) 21.8426 Tj
0 -436.6946 Td
(4543 ) 21.8426 Tj
0 -446.1879 Td
(4544 ) 21.8426 Tj
0 -455.6813 Td
(4545 ) 21.8426 Tj
0 -465.1747 Td
(4546 ) 21.8426 Tj
0 -474.668 Td
(4547 ) 21.8426 Tj
0 -484.1614 Td
(4548 ) 21.8426 Tj
0 -493.6547 Td
(4549 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 45) 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 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
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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/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
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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/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
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Q
showpage
%%PageTrailer
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0 0 612 792 re W
%%EndPageSetup
[] 0 d
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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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[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/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
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(5418 uchar product[20]; // product id) 218.4257 Tj
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(5500 // Multiprocessor bootstrap.) 144.161 Tj
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(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
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(5545 return 0;) 69.8962 Tj
0 -465.1747 Td
(5546 }) 26.2111 Tj
0 -474.668 Td
(5547 ) 21.8426 Tj
0 -484.1614 Td
(5548 ) 21.8426 Tj
0 -493.6547 Td
(5549 ) 21.8426 Tj
0 -522.1348 Td
(Sheet 55) 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/mp.c Page 2) 152.898 Tj
0 -28.4801 Td
(5550 // Search for the MP Floating Pointer Structure, which acc\
ording to the) 332.0071 Tj
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
0 -85.4403 Td
(5556 mpsearch\(void\)) 83.0018 Tj
0 -94.9336 Td
(5557 {) 26.2111 Tj
0 -104.427 Td
(5558 uchar *bda;) 78.6333 Tj
0 -113.9203 Td
(5559 uint p;) 61.1592 Tj
0 -123.4137 Td
(5560 struct mp *mp;) 91.7388 Tj
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
0 -170.8805 Td
(5565 return mp;) 91.7388 Tj
0 -180.3739 Td
(5566 } else {) 65.5277 Tj
0 -189.8672 Td
(5567 p = \(\(bda[0x14]<<8\)|bda[0x13]\)*1024;) 196.5831 Tj
0 -199.3606 Td
(5568 if\(\(mp = mpsearch1\(\(uchar*\)p-1024, 1024\)\)\)) 222.7942 Tj
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
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 63 63
%%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/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
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/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
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 64 64
%%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/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
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/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
Q
Q
Q
Q
showpage
%%PageTrailer
pdfEndPage
%%Page: 65 65
%%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/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
showpage
%%PageTrailer
pdfEndPage
%%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
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 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
0 -522.1348 Td
(Sheet 60) 34.9481 Tj
Q
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showpage
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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
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/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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-612 -792 translate
0 0 612 792 re W
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[] 0 d
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0 0 Td
/F8_0 8.7022 Tf
(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
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/kbd.c Page 1) 157.2665 Tj
0 -28.4801 Td
(6250 #include "types.h") 100.4758 Tj
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(6251 #include "x86.h") 91.7388 Tj
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(6252 #include "defs.h") 96.1073 Tj
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(6253 #include "kbd.h") 91.7388 Tj
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(6271 return 0;) 78.6333 Tj
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(6278 // Last character was an E0 escape; or with 0x80) 249.0053 Tj
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(6285 c = charcode[shift & \(CTL | SHIFT\)][data];) 214.0572 Tj
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(6290 c += 'a' - 'A';) 113.5814 Tj
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(6292 return c;) 69.8962 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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(6302 // Output is written to the screen and serial port.) 244.6368 Tj
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(6328 int i = 0, neg = 0;) 113.5814 Tj
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0 -332.2676 Td
(6332 neg = 1;) 74.2647 Tj
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/F8_0 8.7022 Tf
(Aug 8 01:04 2009 xv6/console.c Page 5) 174.7406 Tj
0 -28.4801 Td
(6500 #define INPUT_BUF 128) 113.5814 Tj
0 -37.9735 Td
(6501 struct {) 56.7907 Tj
0 -47.4668 Td
(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
(6761 SYSCALL\(exit\)) 78.6333 Tj
0 -142.4004 Td
(6762 SYSCALL\(wait\)) 78.6333 Tj
0 -151.8938 Td
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(6765 SYSCALL\(write\)) 83.0018 Tj
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(6767 SYSCALL\(kill\)) 78.6333 Tj
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(6768 SYSCALL\(exec\)) 78.6333 Tj
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(6769 SYSCALL\(open\)) 78.6333 Tj
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(6770 SYSCALL\(mknod\)) 83.0018 Tj
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(6771 SYSCALL\(unlink\)) 87.3703 Tj
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(6772 SYSCALL\(fstat\)) 83.0018 Tj
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(6773 SYSCALL\(link\)) 78.6333 Tj
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(6774 SYSCALL\(mkdir\)) 83.0018 Tj
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(6775 SYSCALL\(chdir\)) 83.0018 Tj
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(6776 SYSCALL\(dup\)) 74.2647 Tj
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(6777 SYSCALL\(getpid\)) 87.3703 Tj
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(6778 SYSCALL\(sbrk\)) 78.6333 Tj
0 -303.7875 Td
(6779 SYSCALL\(sleep\)) 83.0018 Tj
0 -313.2809 Td
(6780 ) 21.8426 Tj
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(6781 ) 21.8426 Tj
0 -332.2676 Td
(6782 ) 21.8426 Tj
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(6783 ) 21.8426 Tj
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(6784 ) 21.8426 Tj
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(6785 ) 21.8426 Tj
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(6786 ) 21.8426 Tj
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(6787 ) 21.8426 Tj
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(6788 ) 21.8426 Tj
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(6789 ) 21.8426 Tj
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(6790 ) 21.8426 Tj
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(6791 ) 21.8426 Tj
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(6792 ) 21.8426 Tj
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(6793 ) 21.8426 Tj
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(6794 ) 21.8426 Tj
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(6795 ) 21.8426 Tj
0 -465.1747 Td
(6796 ) 21.8426 Tj
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(6797 ) 21.8426 Tj
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(6798 ) 21.8426 Tj
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(6799 ) 21.8426 Tj
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0 -322.7743 Td
(6831 exit\(\);) 78.6333 Tj
0 -332.2676 Td
(6832 }) 43.6851 Tj
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(6833 while\(\(wpid=wait\(\)\) >= 0 && wpid != pid\)) 214.0572 Tj
0 -351.2543 Td
(6834 printf\(1, "zombie!\\n"\);) 148.5295 Tj
0 -360.7477 Td
(6835 }) 34.9481 Tj
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(6836 }) 26.2111 Tj
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(6837 ) 21.8426 Tj
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(6838 ) 21.8426 Tj
0 -398.7211 Td
(6839 ) 21.8426 Tj
0 -408.2145 Td
(6840 ) 21.8426 Tj
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(6841 ) 21.8426 Tj
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(6842 ) 21.8426 Tj
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(6843 ) 21.8426 Tj
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(6844 ) 21.8426 Tj
0 -455.6813 Td
(6845 ) 21.8426 Tj
0 -465.1747 Td
(6846 ) 21.8426 Tj
0 -474.668 Td
(6847 ) 21.8426 Tj
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(Aug 8 01:04 2009 xv6/sh.c Page 1) 152.898 Tj
0 -28.4801 Td
(6850 // Shell.) 61.1592 Tj
0 -37.9735 Td
(6851 ) 21.8426 Tj
0 -47.4668 Td
(6852 #include "types.h") 100.4758 Tj
0 -56.9602 Td
(6853 #include "user.h") 96.1073 Tj
0 -66.4535 Td
(6854 #include "fcntl.h") 100.4758 Tj
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(6855 ) 21.8426 Tj
0 -85.4403 Td
(6856 // Parsed command representation) 161.635 Tj
0 -94.9336 Td
(6857 #define EXEC 1) 87.3703 Tj
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(6858 #define REDIR 2) 87.3703 Tj
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(6859 #define PIPE 3) 87.3703 Tj
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(6860 #define LIST 4) 87.3703 Tj
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(6861 #define BACK 5) 87.3703 Tj
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(6862 ) 21.8426 Tj
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(6863 #define MAXARGS 10) 100.4758 Tj
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(6864 ) 21.8426 Tj
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(6865 struct cmd {) 74.2647 Tj
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(6866 int type;) 69.8962 Tj
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(6868 ) 21.8426 Tj
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(6869 struct execcmd {) 91.7388 Tj
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(6870 int type;) 69.8962 Tj
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(6872 char *eargv[MAXARGS];) 122.3184 Tj
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(6873 };) 30.5796 Tj
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(6874 ) 21.8426 Tj
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(6876 int type;) 69.8962 Tj
0 -284.8008 Td
(6877 struct cmd *cmd;) 100.4758 Tj
0 -294.2942 Td
(6878 char *file;) 78.6333 Tj
0 -303.7875 Td
(6879 char *efile;) 83.0018 Tj
0 -313.2809 Td
(6880 int mode;) 69.8962 Tj
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(6881 int fd;) 61.1592 Tj
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(6885 int type;) 69.8962 Tj
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(6886 struct cmd *left;) 104.8443 Tj
0 -379.7344 Td
(6887 struct cmd *right;) 109.2129 Tj
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(6888 };) 30.5796 Tj
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(6889 ) 21.8426 Tj
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(6893 struct cmd *right;) 109.2129 Tj
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(6895 ) 21.8426 Tj
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(6896 struct backcmd {) 91.7388 Tj
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(6897 int type;) 69.8962 Tj
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(6911 struct listcmd *lcmd;) 122.3184 Tj
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(6914 ) 21.8426 Tj
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(6917 ) 21.8426 Tj
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0 -227.8407 Td
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0 -265.8141 Td
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(6927 printf\(2, "exec %s failed\\n", ecmd->argv[0]\);) 235.8998 Tj
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(6928 break;) 65.5277 Tj
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(6929 ) 21.8426 Tj
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0 -389.2278 Td
(6938 break;) 65.5277 Tj
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(6939 ) 21.8426 Tj
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(6944 wait\(\);) 69.8962 Tj
0 -455.6813 Td
(6945 runcmd\(lcmd->right\);) 126.6869 Tj
0 -465.1747 Td
(6946 break;) 65.5277 Tj
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(6947 ) 21.8426 Tj
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(6948 ) 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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(6952 if\(pipe\(p\) < 0\)) 104.8443 Tj
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(6953 panic\("pipe"\);) 109.2129 Tj
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(6954 if\(fork1\(\) == 0\){) 113.5814 Tj
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(6955 close\(1\);) 87.3703 Tj
0 -85.4403 Td
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0 -94.9336 Td
(6957 close\(p[0]\);) 100.4758 Tj
0 -104.427 Td
(6958 close\(p[1]\);) 100.4758 Tj
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0 -123.4137 Td
(6960 }) 43.6851 Tj
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(6969 close\(p[1]\);) 91.7388 Tj
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0 -294.2942 Td
(6978 break;) 65.5277 Tj
0 -303.7875 Td
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(6980 exit\(\);) 61.1592 Tj
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(6996 ) 21.8426 Tj
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(6997 ) 21.8426 Tj
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(6998 ) 21.8426 Tj
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(6999 ) 21.8426 Tj
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0 -161.3871 Td
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(7016 if\(buf[0] == 'c' && buf[1] == 'd' && buf[2] == ' '\){) 266.4794 Tj
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(7017 // Clumsy but will have to do for now.) 214.0572 Tj
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(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
0 -265.8141 Td
(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
0 -408.2145 Td
(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
0 -522.1348 Td
(Sheet 70) 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 5) 152.898 Tj
0 -28.4801 Td
(7050 // Constructors) 87.3703 Tj
0 -37.9735 Td
(7051 ) 21.8426 Tj
0 -47.4668 Td
(7052 struct cmd*) 69.8962 Tj
0 -56.9602 Td
(7053 execcmd\(void\)) 78.6333 Tj
0 -66.4535 Td
(7054 {) 26.2111 Tj
0 -75.9469 Td
(7055 struct execcmd *cmd;) 117.9499 Tj
0 -85.4403 Td
(7056 ) 21.8426 Tj
0 -94.9336 Td
(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
0 -161.3871 Td
(7064 redircmd\(struct cmd *subcmd, char *file, char *efile, int\
mode, int fd\)) 332.0071 Tj
0 -170.8805 Td
(7065 {) 26.2111 Tj
0 -180.3739 Td
(7066 struct redircmd *cmd;) 122.3184 Tj
0 -189.8672 Td
(7067 ) 21.8426 Tj
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
0 -446.1879 Td
(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
0 -522.1348 Td
(Sheet 70) 34.9481 Tj
Q
Q
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showpage
%%PageTrailer
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(Aug 8 01:04 2009 xv6/sh.c Page 6) 152.898 Tj
0 -28.4801 Td
(7100 struct cmd*) 69.8962 Tj
0 -37.9735 Td
(7101 listcmd\(struct cmd *left, struct cmd *right\)) 214.0572 Tj
0 -47.4668 Td
(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
0 -94.9336 Td
(7107 cmd->type = LIST;) 104.8443 Tj
0 -104.427 Td
(7108 cmd->left = left;) 104.8443 Tj
0 -113.9203 Td
(7109 cmd->right = right;) 113.5814 Tj
0 -123.4137 Td
(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
(7116 struct backcmd *cmd;) 117.9499 Tj
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
0 -522.1348 Td
(Sheet 71) 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 7) 152.898 Tj
0 -28.4801 Td
(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
0 -161.3871 Td
(7164 if\(q\)) 52.4222 Tj
0 -170.8805 Td
(7165 *q = s;) 69.8962 Tj
0 -180.3739 Td
(7166 ret = *s;) 69.8962 Tj
0 -189.8672 Td
(7167 switch\(*s\){) 78.6333 Tj
0 -199.3606 Td
(7168 case 0:) 61.1592 Tj
0 -208.8539 Td
(7169 break;) 65.5277 Tj
0 -218.3473 Td
(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
0 -379.7344 Td
(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
0 -417.7079 Td
(7191 if\(eq\)) 56.7907 Tj
0 -427.2012 Td
(7192 *eq = s;) 74.2647 Tj
0 -436.6946 Td
(7193 ) 21.8426 Tj
0 -446.1879 Td
(7194 while\(s < es && strchr\(whitespace, *s\)\)) 200.9517 Tj
0 -455.6813 Td
(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
0 -522.1348 Td
(Sheet 71) 34.9481 Tj
Q
Q
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Q
showpage
%%PageTrailer
pdfEndPage
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0 0 612 792 re W
%%EndPageSetup
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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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(Aug 8 01:04 2009 xv6/sh.c Page 8) 152.898 Tj
0 -28.4801 Td
(7200 int) 34.9481 Tj
0 -37.9735 Td
(7201 peek\(char **ps, char *es, char *toks\)) 183.4776 Tj
0 -47.4668 Td
(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
0 -123.4137 Td
(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
0 -151.8938 Td
(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
0 -227.8407 Td
(7221 struct cmd *cmd;) 100.4758 Tj
0 -237.334 Td
(7222 ) 21.8426 Tj
0 -246.8274 Td
(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
0 -360.7477 Td
(7235 parseline\(char **ps, char *es\)) 152.898 Tj
0 -370.2411 Td
(7236 {) 26.2111 Tj
0 -379.7344 Td
(7237 struct cmd *cmd;) 100.4758 Tj
0 -389.2278 Td
(7238 ) 21.8426 Tj
0 -398.7211 Td
(7239 cmd = parsepipe\(ps, es\);) 135.4239 Tj
0 -408.2145 Td
(7240 while\(peek\(ps, es, "&"\)\){) 139.7925 Tj
0 -417.7079 Td
(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
0 -522.1348 Td
(Sheet 72) 34.9481 Tj
Q
Q
q
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/sh.c Page 9) 152.898 Tj
0 -28.4801 Td
(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
%%DocumentSuppliedResources:
%%+ font YLWBJI+LucidaSans-Typewriter83
%%EOF
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