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2018-08-30thanks eyalz800Frans Kaashoek1-1/+1
2017-08-29fix runoff complaints about pagination and long linesRobert Morris1-0/+4
2017-08-09Commit to running on an SMP (perhaps with only 1 core). Remove most codeFrans Kaashoek1-3/+1
from picirq.c and remove timer.c completely. Update runoff.list.
2017-02-01Eliminate code for gs trick to track per-cpu state. We rely on lapiccpunum()Frans Kaashoek1-1/+1
to find a per-cpu id with which we locate a cpu's cpu struct.
2017-01-31Start of an experiment to remove the use of gs for cpu local variables.Frans Kaashoek1-5/+4
2016-09-02Make runoff happyFrans Kaashoek1-3/+0
2016-09-02APIC IDs may not be consecutive and start from zero, so we cannot really use itFrans Kaashoek1-3/+3
as a direct index into cpus. Record apicid in struct cpu and have cpunum() look for it. Replace cpu->id with cpunum() everywhere, and replace cpu->id with cpu->apicid. Thanks to Xi Wang.
2016-08-25Remove trailing white space with:Frans Kaashoek1-3/+3
for f in *.{h,c}; do sed -i .sed 's/[[:blank:]]*$//' $f; done (Thanks to Nicolás Wolovick)
2016-08-24p2v -> P2VRobert Morris1-3/+3
2016-08-11main commentsRobert Morris1-7/+6
2016-08-10more comments in entryother.SRobert Morris1-4/+5
2015-06-27Pick up where i left off in april:Frans Kaashoek1-1/+0
- move log into metadata part of disk, so that marking that the log's blocks are in use falls out for free - superblock describes the whole disk (sizes and offets) - sizes and offsets are computed in one place (mkfs) and the rest of the code refers to the superblock for these values, instead of recomputing them.
2014-08-29Nice layout for a printout of the codeFrans Kaashoek1-1/+4
2012-08-22Remove unused argument from lapicinit (thanks to Peter Froehlich)Frans Kaashoek1-2/+2
2011-09-14Use | instead of + for entrypgdir. Linker doesn't get in our way here.Austin Clements1-2/+2
2011-09-13eliminate enter_alloc -- use kalloc for everythingRobert Morris1-9/+6
2011-09-01Fix layout issues for printed versionFrans Kaashoek1-8/+9
2011-08-30enterpgdir -> entrypgdirRobert Morris1-5/+5
2011-08-29Style nits; indentation and tabsAustin Clements1-4/+4
2011-08-22Remove sys_init syscallFrans Kaashoek1-1/+1
Invoke initlog from forkret on first user process
2011-08-15Avoid "boot" in xv6Frans Kaashoek1-29/+21
2011-08-15Use 4Mbyte pages during bootFrans Kaashoek1-1034/+3
2011-08-15Separate more clearly bootloader from xv6 by renaming multiboot.S to entry.S ↵Frans Kaashoek1-11/+11
etc. Maybe the string boot shouldn't appear in xv6 code?
2011-08-12OopsFrans Kaashoek1-2/+2
2011-08-12Some commentsFrans Kaashoek1-1/+7
2011-08-11Make AP processors boot using bootpgdirFrans Kaashoek1-23/+14
Remove device mapping from bootpgdir Remove unnecessary vmenable Set CPUS back to 2 in Makefile Passes all usertests
2011-08-09Remove jmpkstackFrans Kaashoek1-27/+2
2011-08-09Use static page table for boot, mapping first 4Mbyte; no more segment trickFrans Kaashoek1-4/+1058
Allocate proper kernel page table immediately in main using boot allocator Remove pginit Simplify address space layout a tiny bit More to come (e.g., superpages to simplify static table)
2011-07-29Map kernel highFrans Kaashoek1-10/+23
Very important to give qemu memory through PHYSTOP :(
2011-07-27Dirt simple loggingFrans Kaashoek1-1/+1
Passes usertests and stressfs Seems to recover correctly in a number of simple cases
2011-02-19xv6: formatting, cleanup, rev5 (take 2)Russ Cox1-1/+6
2011-01-11make new code like old codeRuss Cox1-15/+15
Variable declarations at top of function, separate from initialization. Use == 0 instead of ! for checking pointers. Consistent spacing around {, *, casts. Declare 0-parameter functions as (void) not (). Integer valued functions return -1 on failure, 0 on success.
2010-09-13change some comments, maybe more informativeRobert Morris1-8/+16
delete most comments from bootother.S (since copy of bootasm.S) ksegment() -> seginit() move more stuff from main() to mainc()
2010-09-01Space policeAustin Clements1-1/+1
2010-08-31no more pminit, or ELF header at 0x10000Robert Morris1-1/+1
kinit() knows about end and PHYSTOP map all of kernel read/write (rather than r/o instructions) thanks, austin
2010-08-31kalloc/kfree now only a page at a timeRobert Morris1-2/+2
do not keep sorted contiguous free list
2010-08-30xxRobert Morris1-1/+1
2010-08-30set only PG and WP in vminit; the rest don't seem to be needed and are confusingRobert Morris1-1/+1
2010-08-05add some commentsRobert Morris1-10/+12
find out the hard way why user and kernel must have separate segment descriptors
2010-08-05move jkstack to main.cRobert Morris1-6/+16
replace jstack with asm()s
2010-07-23Checkpoint page-table version for SMPFrans Kaashoek1-14/+9
Includes code for TLB shootdown (which actually seems unnecessary for xv6)
2010-07-02Initial version of single-cpu xv6 with page tablesFrans Kaashoek1-6/+20
2009-09-02another attempt at cpu-local variables.Russ Cox1-3/+1
this time do it ourselves instead of piggybacking on TLS. add -fno-pic to Makefile; pic code breaks our fake TLS.
2009-08-30assorted fixes:Russ Cox1-10/+10
* rename c/cp to cpu/proc * rename cpu.context to cpu.scheduler * fix some comments * formatting for printout
2009-05-31Some proc cleanup, moving some of copyproc into allocproc.rsc1-11/+16
Also, an experiment: use "thread-local" storage for c and cp instead of the #define macro for curproc[cpu()].
2009-03-08be consistent: no underscores in function namesrsc1-10/+10
2009-03-08xv6: boot loader adjustmentsrsc1-5/+0
do Bochs breakpoint and spin in bootasm.S. not needed in bootmain too. fix readseg bug (rounding of va). zero segments when memsz > filesz. no need to clear BSS in kernel main. make bootother.S like bootasm.S
2008-08-21fix obvious printf nits after reading through codekolya1-1/+1
2007-10-01Incorporate new understanding of/with Intel SMP spec.rsc1-1/+2
Dropped cmpxchg in favor of xchg, to match lecture notes. Use xchg to release lock, for future protection and to keep gcc from acting clever.
2007-09-30Re: why cpuid() in locking code?rsc1-1/+0
rtm wrote: > Why does acquire() call cpuid()? Why does release() call cpuid()? The cpuid in acquire is redundant with the cmpxchg, as you said. I have removed the cpuid from acquire. The cpuid in release is actually doing something important, but not on the hardware. It keeps gcc from reordering the lock->locked assignment above the other two during optimization. (Not that current gcc -O2 would choose to do that, but it is allowed to.) I have replaced the cpuid in release with a "gcc barrier" that keeps gcc from moving things around but has no hardware effect. On a related note, I don't think the cpuid in mpmain is necessary, for the same reason that the cpuid wasn't needed in release. As to the question of whether acquire(); x = protected; release(); might read protected after release(), I still haven't convinced myself whether it can. I'll put the cpuid back into release if we determine that it can. Russ
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