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xv6 is a modern re-implementation of Sixth Edition Unix in ANSI C for multiprocessor x86/x86_64 systems.
812 commits 2 branches 0 tags 12 MiB
C 86.1%
Assembly 3.7%
Makefile 3.4%
Shell 2.5%
Perl 2.3%
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Austin Clements 5304c854a4 Move xv6 release tars/pdfs in to 6.828 repo
2011-09-07 11:57:41 -04:00
.cvsignore update .cvsignore 2008-10-15 04:54:24 +00:00
.dir-locals.el Setting indent-tabs-mode nil everywhere is dangerous 2011-09-05 15:22:16 -04:00
.gdbinit.tmpl Use the symbol file 2009-09-20 23:08:36 -04:00
.gitignore Sync up clean and gitignore better 2011-09-05 15:21:40 -04:00
asm.h add some comments 2010-08-05 21:16:55 -04:00
bio.c Revert "Introduce and use sleeplocks instead of BUSY flags" 2011-08-29 17:18:40 -04:00
bootasm.S segment register -> segment descriptor 2011-08-26 06:47:13 -04:00
bootmain.c Make the ELF entry point a physical address 2011-09-04 15:51:46 -04:00
buf.h Revert "Introduce and use sleeplocks instead of BUSY flags" 2011-08-29 17:18:40 -04:00
BUGS sh 2007-09-05 15:55:43 +00:00
cat.c more consistent spacing 2007-08-28 18:32:08 +00:00
console.c Fix same wonky pagebreak bug in console.c 2011-09-02 15:35:49 -04:00
cuth delete unnecessary #include lines 2007-08-27 23:26:33 +00:00
defs.h clear_pte_u -> clearpteu 2011-09-02 14:37:04 -04:00
dot-bochsrc make bochsrc work for bochs 2.2.6 2008-09-03 14:10:47 +00:00
echo.c Remove puts in favor of printf. 2007-08-24 20:03:40 +00:00
elf.h Make elf proghdr fields match what objdump prints 2011-08-17 20:23:36 -04:00
entry.S Make the ELF entry point a physical address 2011-09-04 15:51:46 -04:00
entryother.S Fix stale comments in entryother.S 2011-09-04 15:56:16 -04:00
exec.c I can't do math; fix bug introduced in 5a9761 2011-09-03 10:21:51 -04:00
fcntl.h nit 2007-08-28 04:13:24 +00:00
file.c Put filewrite in its own column 2011-09-02 15:35:34 -04:00
file.h Revert "Introduce and use sleeplocks instead of BUSY flags" 2011-08-29 17:18:40 -04:00
forktest.c Initial version of single-cpu xv6 with page tables 2010-07-02 14:51:53 -04:00
fs.c Revert "Introduce and use sleeplocks instead of BUSY flags" 2011-08-29 17:18:40 -04:00
fs.h Fit fs.h in one column 2011-09-02 14:57:28 -04:00
gdbutil GDB utilities 2009-11-23 17:47:57 -05:00
grep.c add grep; add lost echo 2007-08-28 04:26:34 +00:00
ide.c Revert "Introduce and use sleeplocks instead of BUSY flags" 2011-08-29 17:18:40 -04:00
init.c group locks into structs they protect. 2009-05-31 05:12:21 +00:00
initcode.S Remove sys_init syscall 2011-08-22 20:05:15 -04:00
ioapic.c trap cleanup 2009-07-11 19:24:56 -07:00
kalloc.c delete dead code 2011-08-21 21:14:29 -04:00
kbd.c be consistent: no underscores in function names 2009-03-08 22:07:13 +00:00
kbd.h formatting; split kbd constants into kbd.h 2007-08-14 19:31:16 +00:00
kernel.ld Nuke data.S, since we do have a custom linker script. 2011-09-02 14:51:55 -04:00
kill.c tab police 2009-05-31 00:39:17 +00:00
lapic.c Fix weird pagebreak bug 2011-09-02 15:29:33 -04:00
LICENSE Add MIT license file; update xv6-rev2.tar.gz with LICENSE. 2009-05-26 16:58:33 +00:00
ln.c add ln 2007-08-22 05:54:55 +00:00
log.c Add blank page to get our super FS spreads back 2011-09-02 15:14:06 -04:00
ls.c Remove puts in favor of printf. 2007-08-24 20:03:40 +00:00
LucidaSans-Typewriter83 add nice font 2008-08-20 18:00:24 +00:00
main.c Fix layout issues for printed version 2011-09-01 10:25:20 -04:00
Makefile Re-alphabetize OBJS 2011-09-05 23:45:04 -04:00
memide.c missing file memide.c 2011-01-11 13:54:23 -05:00
memlayout.h Fix layout issues for printed version 2011-09-01 10:25:20 -04:00
mkdir.c more consistent spacing 2007-08-28 18:32:08 +00:00
mkfs.c Dirt simple logging 2011-07-27 20:35:46 -04:00
mmu.h Fix layout issues for printed version 2011-09-01 10:25:20 -04:00
mp.c Avoid "boot" in xv6 2011-08-15 20:11:13 -04:00
mp.h Simplify MP hardware code. 2007-08-27 22:53:31 +00:00
Notes nit in console interrupts 2006-09-07 00:00:33 +00:00
param.h log write() data 2011-08-12 09:25:39 -04:00
picirq.c Get rid of the blank page in picirq.c. It misaligs things now. 2010-09-02 18:36:06 -04:00
pipe.c Revert "Introduce and use sleeplocks instead of BUSY flags" 2011-08-29 17:18:40 -04:00
pr.pl remove //DOC in the right place 2009-07-12 19:07:30 -07:00
printf.c spaces around else for rtm 2007-08-28 18:37:41 +00:00
proc.c fix usertests to correctly test what happens when you call 2011-09-01 12:02:49 -04:00
proc.h Avoid "boot" in xv6 2011-08-15 20:11:13 -04:00
README Update year in URL 2011-09-02 16:32:46 -04:00
rm.c more consistent spacing 2007-08-28 18:32:08 +00:00
runoff Remove unused nop_pause function. 2010-09-02 14:08:45 -04:00
runoff.list Remove data.S from runoff, too 2011-09-02 14:52:53 -04:00
runoff.spec Note about the meaning of sheet1 in runoff.spec 2011-09-05 21:52:50 -04:00
runoff1 xv6: formatting, cleanup, rev5 (take 2) 2011-02-19 21:17:55 -05:00
sh.c move jkstack to main.c 2010-08-05 14:15:03 -04:00
show1 PDF at http://am.lcs.mit.edu/~rsc/xv6.pdf 2007-08-22 06:01:32 +00:00
sign.pl spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
sleep1.p Model verifying that wakeup really 2007-10-12 04:21:04 +00:00
spinlock.c Revert "Introduce and use sleeplocks instead of BUSY flags" 2011-08-29 17:18:40 -04:00
spinlock.h Revert "Introduce and use sleeplocks instead of BUSY flags" 2011-08-29 17:18:40 -04:00
spinp Model verifying that wakeup really 2007-10-12 04:21:04 +00:00
stat.h move T_DIR etc into stat.h; move type up 2009-05-31 00:26:10 +00:00
stressfs.c make new code like old code 2011-01-11 13:01:13 -05:00
string.c Use stosl in memset; makes boot time bearable 2011-09-01 10:41:27 -04:00
swtch.S move jkstack to main.c 2010-08-05 14:15:03 -04:00
symlink.patch symlink implementation 2007-08-30 18:36:38 +00:00
syscall.c Remove sys_init syscall 2011-08-22 20:05:15 -04:00
syscall.h Remove sys_init syscall 2011-08-22 20:05:15 -04:00
sysfile.c Shorten sys_unlink a little; create now fits in column 2011-09-02 15:20:27 -04:00
sysproc.c Avoid "boot" in xv6 2011-08-15 20:11:13 -04:00
timer.c shuffle and tweak for formatting. 2009-08-08 01:07:30 -07:00
toc.ftr Update index example in TOC footer 2011-09-02 16:30:20 -04:00
toc.hdr nits 2007-08-28 18:23:48 +00:00
trap.c Map kernel high 2011-07-29 07:31:27 -04:00
trapasm.S One definition of several macros and constants 2011-08-08 13:30:08 -04:00
traps.h kill TLB shoot down code 2010-07-28 14:38:05 -04:00
TRICKS more doc tweaks 2009-07-12 18:33:37 -07:00
types.h some cleanup 2010-07-25 20:30:21 -04:00
uart.c shuffle and tweak for formatting. 2009-08-08 01:07:30 -07:00
ulib.c make new code like old code 2011-01-11 13:01:13 -05:00
umalloc.c make new code like old code 2011-01-11 13:01:13 -05:00
user.h make new code like old code 2011-01-11 13:01:13 -05:00
usertests.c inaccessible page under the user stack page, to help exec deal w/ too-large args 2011-09-01 13:25:34 -04:00
usys.S uptime() sys call for benchmarking 2010-08-11 14:34:45 -04:00
vectors.pl sync with c; .text is implied 2009-05-31 01:00:38 +00:00
vm.c Nuke data.S, since we do have a custom linker script. 2011-09-02 14:51:55 -04:00
wc.c more consistent spacing 2007-08-28 18:32:08 +00:00
x86.h Remove unused x86.h definitions 2011-09-02 14:52:13 -04:00
zombie.c delete unnecessary #include lines 2007-08-27 23:26:33 +00:00

README 

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.

ACKNOWLEDGMENTS

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 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 (entryother.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 2006-2011 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). 

BUILDING 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/6.828/2011/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".

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