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C 86.1%
Assembly 3.7%
Makefile 3.4%
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Austin Clements 97657d703f Add -fno-omit-frame-pointer to compile flags. 
At some point between gcc 4.4 and 4.6, omitting the frame pointer
became default if any -O is specified.  getcallerpcs relies on the
frame pointer, so bring it back.
2011-06-24 14:22:19 -04:00
web web: rev5 2011-02-19 21:21:49 -05:00
.cvsignore update .cvsignore 2008-10-15 04:54:24 +00:00
.gdbinit.tmpl Use the symbol file 2009-09-20 23:08:36 -04:00
.gitignore Russ's fix for panic remap 2011-04-28 08:01:36 -04:00
asm.h add some comments 2010-08-05 21:16:55 -04:00
bio.c a few nits 2010-07-23 12:52:50 -04:00
bootasm.S xv6: formatting, cleanup, rev5 (take 2) 2011-02-19 21:17:55 -05:00
bootmain.c make new code like old code 2011-01-11 13:01:13 -05:00
bootother.S xv6: formatting, cleanup, rev5 (take 2) 2011-02-19 21:17:55 -05:00
buf.h Another attempt at the bio.c comment. 2007-08-27 14:09:30 +00:00
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 fixes from Peter Froehlich 2011-02-28 09:32:20 -05:00
cuth delete unnecessary #include lines 2007-08-27 23:26:33 +00:00
data.S Russ's fix for panic remap 2011-04-28 08:01:36 -04:00
defs.h more trivial cleanup 2011-01-11 13:51:40 -05:00
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 shuffle and tweak for formatting. 2009-08-08 01:07:30 -07:00
exec.c xv6: formatting, cleanup, rev5 (take 2) 2011-02-19 21:17:55 -05:00
fcntl.h nit 2007-08-28 04:13:24 +00:00
file.c Initial version of single-cpu xv6 with page tables 2010-07-02 14:51:53 -04:00
file.h shuffle and tweak for formatting. 2009-08-08 01:07:30 -07:00
forktest.c Initial version of single-cpu xv6 with page tables 2010-07-02 14:51:53 -04:00
fs.c do not run past the end of the disk! 2011-06-24 05:26:57 -04:00
fs.h xv6: formatting, cleanup, rev5 (take 2) 2011-02-19 21:17:55 -05:00
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 xv6: formatting, cleanup, rev5 (take 2) 2011-02-19 21:17:55 -05:00
init.c group locks into structs they protect. 2009-05-31 05:12:21 +00:00
initcode.S rearrangements and cleanup for text 2009-07-11 19:26:01 -07:00
ioapic.c trap cleanup 2009-07-11 19:24:56 -07:00
kalloc.c more trivial cleanup 2011-01-11 13:51:40 -05:00
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
kill.c tab police 2009-05-31 00:39:17 +00:00
lapic.c kill TLB shoot down code 2010-07-28 14:38:05 -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
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 xv6: formatting, cleanup, rev5 (take 2) 2011-02-19 21:17:55 -05:00
Makefile Add -fno-omit-frame-pointer to compile flags. 2011-06-24 14:22:19 -04:00
memide.c missing file memide.c 2011-01-11 13:54:23 -05:00
mkdir.c more consistent spacing 2007-08-28 18:32:08 +00:00
mkfs.c fixes from Peter Froehlich 2011-02-28 09:32:20 -05:00
mmu.h make new code like old code 2011-01-11 13:01:13 -05:00
mp.c xv6: formatting, cleanup, rev5 (take 2) 2011-02-19 21:17:55 -05:00
mp.h Simplify MP hardware code. 2007-08-27 22:53:31 +00:00
multiboot.S multiboot support and memory-only (no disk) kernel 2011-01-11 13:27:45 -05:00
Notes nit in console interrupts 2006-09-07 00:00:33 +00:00
param.h copyout() copies data to a va in a pagetable, for exec() &c 2010-09-27 16:14:33 -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 make new code like old code 2011-01-11 13:01:13 -05:00
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 xv6: formatting, cleanup, rev5 (take 2) 2011-02-19 21:17:55 -05:00
proc.h change some comments, maybe more informative 2010-09-13 15:34:44 -04:00
README Add Nickolai and myself and scrunch two lines out of the text elsewhere 2010-09-02 03:25:33 -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 xv6: formatting, cleanup, rev5 (take 2) 2011-02-19 21:17:55 -05:00
runoff.spec xv6: formatting, cleanup, rev5 (take 2) 2011-02-19 21:17:55 -05:00
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 make new code like old code 2011-01-11 13:01:13 -05:00
spinlock.h assorted fixes: 2009-08-30 23:02:08 -07:00
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 Remove memcpy prototypes at Russ' request to prevent code from calling 2009-10-07 13:06:55 -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 fixes from Peter Froehlich 2011-02-28 09:32:20 -05:00
syscall.h uptime() sys call for benchmarking 2010-08-11 14:34:45 -04:00
sysfile.c make new code like old code 2011-01-11 13:01:13 -05:00
sysproc.c uptime() sys call for benchmarking 2010-08-11 14:34:45 -04:00
timer.c shuffle and tweak for formatting. 2009-08-08 01:07:30 -07:00
toc.ftr xv6: formatting, cleanup, rev5 (take 2) 2011-02-19 21:17:55 -05:00
toc.hdr nits 2007-08-28 18:23:48 +00:00
trap.c xv6: formatting, cleanup, rev5 (take 2) 2011-02-19 21:17:55 -05:00
trapasm.S initproc, usegment, swtch tweaks 2009-07-11 19:28:29 -07:00
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 xv6: formatting, cleanup, rev5 (take 2) 2011-02-19 21:17:55 -05:00
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 xv6: formatting, cleanup, rev5 (take 2) 2011-02-19 21:17:55 -05:00
wc.c more consistent spacing 2007-08-28 18:32:08 +00:00
x86.h Remove unused nop_pause function. 2010-09-02 14:08:45 -04:00
xv6-rev0.tar.gz dist tarball 2006-09-08 15:44:42 +00:00
xv6-rev1.tar.gz DO NOT MAIL: xv6-rev1 2007-08-30 14:11:21 +00:00
xv6-rev2.tar.gz Add MIT license file; update xv6-rev2.tar.gz with LICENSE. 2009-05-26 16:58:33 +00:00
xv6-rev3.tar.gz add .gdbinit.tmpl to dist 2009-09-15 19:15:59 -04:00
xv6-rev4.tar.gz Rev 4 2010-09-03 15:47:28 -04:00
xv6-rev5.pdf xv6: formatting, cleanup, rev5 2011-02-19 21:16:54 -05:00
xv6-rev5.tar.gz rebuild xv6-rev5.tar.gz 2011-02-28 09:32:54 -05:00
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 (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.

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/6.828/2007/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".

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