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Xv6 is a teaching operating system developed in the summer of 2006 for MIT's operating systems course, 6.828: operating systems Engineering.

pdos.csail.mit.edu/6.828/2011/xv6.html

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Name		Name	Last commit message	Last commit date
Latest commit History 368 Commits
.cvsignore		.cvsignore
8253pit.c		8253pit.c
BUGS		BUGS
Makefile		Makefile
Notes		Notes
README		README
asm.h		asm.h
bio.c		bio.c
bootasm.S		bootasm.S
bootmain.c		bootmain.c
bootother.S		bootother.S
buf.h		buf.h
cat.c		cat.c
console.c		console.c
defs.h		defs.h
dev.h		dev.h
dot-bochsrc		dot-bochsrc
echo.c		echo.c
elf.h		elf.h
exec.c		exec.c
fcntl.h		fcntl.h
file.c		file.c
file.h		file.h
forktest.c		forktest.c
fs.c		fs.c
fs.h		fs.h
fsvar.h		fsvar.h
ide.c		ide.c
init.c		init.c
initcode.S		initcode.S
ioapic.c		ioapic.c
ioapic.h		ioapic.h
kalloc.c		kalloc.c
kbd.h		kbd.h
kill.c		kill.c
lapic.c		lapic.c
ln.c		ln.c
ls.c		ls.c
main.c		main.c
mkdir.c		mkdir.c
mkfs.c		mkfs.c
mmu.h		mmu.h
mp.c		mp.c
mp.h		mp.h
param.h		param.h
picirq.c		picirq.c
pipe.c		pipe.c
pr.pl		pr.pl
printf.c		printf.c
proc.c		proc.c
proc.h		proc.h
rm.c		rm.c
runoff		runoff
runoff.list		runoff.list
runoff.spec		runoff.spec
runoff1		runoff1
setjmp.S		setjmp.S
sh.c		sh.c
show1		show1
sign.pl		sign.pl
spinlock.c		spinlock.c
spinlock.h		spinlock.h
stat.h		stat.h
string.c		string.c
syscall.c		syscall.c
syscall.h		syscall.h
sysfile.c		sysfile.c
sysproc.c		sysproc.c
toc.ftr		toc.ftr
toc.hdr		toc.hdr
trap.c		trap.c
trapasm.S		trapasm.S
traps.h		traps.h
types.h		types.h
ulib.c		ulib.c
umalloc.c		umalloc.c
user.h		user.h
usertests.c		usertests.c
usys.S		usys.S
vectors.pl		vectors.pl
x86.h		x86.h
xv6-rev0.tar.gz		xv6-rev0.tar.gz
xv6.pdf		xv6.pdf
xv6.ps		xv6.ps
zombie.c		zombie.c

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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.

ACKNOWLEDGEMENTS

xv6 is inspired by John Lions' Commentary on UNIX 6th Edition (Peer
to Peer Communications; ISBN: 1-57398-013-7; 1st edition (June 14,
2000)). See also http://pdos.csail.mit.edu/6.828/2007/v6.html, 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, ioapic.h, lapic.c)
    FreeBSD (ioapic.c)
    NetBSD (console.c)

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

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

ERROR REPORTS

If you spot errors or have suggestions for improvement, please send
email to Frans Kaashoek and Robert Morris
({kaashoek,rtm}@csail.mit.edu). 

BUIDLING AND RUNNING XV6

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 http://pdos.csail.mit.edu/6.828/2007/tools.html.
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".  Both log the xv6 screen output to 
standard output.

To create a typeset version of the code, run "make xv6.pdf".
This requires the "mpage" text formatting utility.
See http://www.mesa.nl/pub/mpage/.