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Mostly just a mirror of xv6 releases. The "fixes" branch has some minor improvements. THIS REPOSITORY IS VERY MUCH OUT OF DATE!
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Latest commit 8f49197 @phf Import of UPDATED xv6-rev5.tar.gz
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.gdbinit.tmpl Import of xv6-rev4.tar.gz
Makefile Import of xv6-rev5.tar.gz
README Import of xv6-rev4.tar.gz
asm.h Import of xv6-rev4.tar.gz
bio.c Import of xv6-rev3.tar.gz
bootasm.S Import of UPDATED xv6-rev5.tar.gz
bootmain.c Import of xv6-rev5.tar.gz
bootother.S Import of xv6-rev5.tar.gz
buf.h Import of xv6-rev1.tar.gz
cat.c Import of xv6-rev1.tar.gz
data.S Import of xv6-rev5.tar.gz
defs.h Import of xv6-rev5.tar.gz
dot-bochsrc Import of xv6-rev3.tar.gz
echo.c Import of xv6-rev1.tar.gz
elf.h Import of xv6-rev3.tar.gz
exec.c Import of xv6-rev5.tar.gz
fcntl.h Import of xv6-rev1.tar.gz
file.c Import of xv6-rev3.tar.gz
file.h Import of xv6-rev3.tar.gz
forktest.c Import of xv6-rev4.tar.gz
fs.c Import of xv6-rev4.tar.gz
fs.h Import of xv6-rev3.tar.gz
gdbutil Import of xv6-rev4.tar.gz
grep.c Import of xv6-rev1.tar.gz
ide.c Import of xv6-rev5.tar.gz
init.c Import of xv6-rev3.tar.gz
initcode.S Import of xv6-rev3.tar.gz
ioapic.c Import of xv6-rev3.tar.gz
kalloc.c Import of xv6-rev5.tar.gz
kbd.c Import of xv6-rev3.tar.gz
kbd.h Import of xv6-rev1.tar.gz
kill.c Import of xv6-rev3.tar.gz
lapic.c Import of xv6-rev4.tar.gz
ln.c Import of xv6-rev1.tar.gz
ls.c Import of xv6-rev1.tar.gz
main.c Import of xv6-rev5.tar.gz
mkdir.c Import of xv6-rev1.tar.gz
mkfs.c Import of UPDATED xv6-rev5.tar.gz
mmu.h Import of xv6-rev5.tar.gz
mp.c Import of xv6-rev5.tar.gz
mp.h Import of xv6-rev1.tar.gz
multiboot.S Import of xv6-rev5.tar.gz
param.h Import of xv6-rev5.tar.gz
picirq.c Import of xv6-rev4.tar.gz
pipe.c Import of xv6-rev5.tar.gz Import of xv6-rev3.tar.gz
printf.c Import of xv6-rev1.tar.gz
proc.c Import of xv6-rev5.tar.gz
proc.h Import of xv6-rev5.tar.gz
rm.c Import of xv6-rev1.tar.gz
runoff.list Import of xv6-rev5.tar.gz
runoff.spec Import of xv6-rev1.tar.gz
runoff1 Import of xv6-rev5.tar.gz
sh.c Import of xv6-rev4.tar.gz Import of xv6-rev0.tar.gz
spinlock.c Import of xv6-rev5.tar.gz
spinlock.h Import of xv6-rev3.tar.gz
stat.h Import of xv6-rev3.tar.gz
stressfs.c Import of xv6-rev5.tar.gz
string.c Import of xv6-rev4.tar.gz
swtch.S Import of xv6-rev3.tar.gz
syscall.c Import of UPDATED xv6-rev5.tar.gz
syscall.h Import of xv6-rev4.tar.gz
sysfile.c Import of xv6-rev5.tar.gz
sysproc.c Import of xv6-rev4.tar.gz
timer.c Import of xv6-rev3.tar.gz Import of xv6-rev5.tar.gz
toc.hdr Import of xv6-rev1.tar.gz
trap.c Import of xv6-rev5.tar.gz
trapasm.S Import of xv6-rev3.tar.gz
traps.h Import of xv6-rev4.tar.gz
types.h Import of xv6-rev4.tar.gz
uart.c Import of xv6-rev3.tar.gz
ulib.c Import of xv6-rev5.tar.gz
umalloc.c Import of xv6-rev5.tar.gz
user.h Import of xv6-rev5.tar.gz
usertests.c Import of xv6-rev5.tar.gz
usys.S Import of xv6-rev4.tar.gz Import of xv6-rev3.tar.gz
vm.c Import of xv6-rev5.tar.gz
wc.c Import of xv6-rev1.tar.gz
x86.h Import of xv6-rev4.tar.gz
zombie.c Import of xv6-rev1.tar.gz


xv6 is a re-implementation of Dennis Ritchie's and Ken Thompson's Unix
Version 6 (v6).  xv6 loosely follows the structure and style of v6,
but is implemented for a modern x86-based multiprocessor using ANSI C.


xv6 is inspired by John Lions's Commentary on UNIX 6th Edition (Peer
to Peer Communications; ISBN: 1-57398-013-7; 1st edition (June 14,
2000)). See also, which
provides pointers to on-line resources for v6.

xv6 borrows code from the following sources:
    JOS (asm.h, elf.h, mmu.h, bootasm.S, ide.c, console.c, and others)
    Plan 9 (bootother.S, mp.h, mp.c, lapic.c)
    FreeBSD (ioapic.c)
    NetBSD (console.c)

The following people made contributions:
    Russ Cox (context switching, locking)
    Cliff Frey (MP)
    Xiao Yu (MP)
    Nickolai Zeldovich
    Austin Clements

In addition, we are grateful for the patches contributed by Greg
Price, Yandong Mao, and Hitoshi Mitake.

The code in the files that constitute xv6 is
Copyright 2006-2007 Frans Kaashoek, Robert Morris, and Russ Cox.


If you spot errors or have suggestions for improvement, please send
email to Frans Kaashoek and Robert Morris (kaashoek, 


To build xv6 on an x86 ELF machine (like Linux or FreeBSD), run "make".
On non-x86 or non-ELF machines (like OS X, even on x86), you will
need to install a cross-compiler gcc suite capable of producing x86 ELF
binaries.  See
Then run "make TOOLPREFIX=i386-jos-elf-".

To run xv6, you can use Bochs or QEMU, both PC simulators.
Bochs makes debugging easier, but QEMU is much faster. 
To run in Bochs, run "make bochs" and then type "c" at the bochs prompt.
To run in QEMU, run "make qemu".

To create a typeset version of the code, run "make xv6.pdf".  This
requires the "mpage" utility.  See
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