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xv6 is a modern re-implementation of Sixth Edition Unix in ANSI C for multiprocessor x86/x86_64 systems.
158 commits 2 branches 0 tags 12 MiB
C 86.1%
Assembly 3.7%
Makefile 3.4%
Shell 2.5%
Perl 2.3%
Other 2%
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rsc 03b6376f56 standardize on unnamed args in prototypes
2006-09-06 17:10:00 +00:00
.cvsignore New formatting scripts. 2006-09-05 15:50:55 +00:00
asm.h spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
bio.c complain if no disk 1 2006-08-30 18:55:06 +00:00
bootasm.S spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
bootmain.c spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
bootother.S spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
buf.h LRU disk cache replacement 2006-08-12 22:34:13 +00:00
cat.c spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
console.c spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
defs.h standardize on unnamed args in prototypes 2006-09-06 17:10:00 +00:00
dev.h init creates console, opens 0/1/2, runs sh 2006-08-11 13:55:18 +00:00
dot-bochsrc update 2006-07-26 10:17:39 +00:00
echo.c i/o redirection in sh 2006-08-23 01:09:24 +00:00
elf.h spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
fcntl.h low-level keyboard input (not hooked up to /dev yet) 2006-08-10 02:07:10 +00:00
fd.c compiling, but untested dup 2006-08-20 03:33:01 +00:00
fd.h fix race in holding() check in acquire() 2006-08-08 19:58:06 +00:00
fs.c spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
fs.h inode addrs[NDIRECT] -> NADDRS 2006-08-25 01:11:30 +00:00
fstests.c clear killed flag in exit 2006-08-29 19:59:52 +00:00
fsvar.h inode addrs[NDIRECT] -> NADDRS 2006-08-25 01:11:30 +00:00
ide.c spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
init.c prune unneeded panics and debug output 2006-08-29 19:06:37 +00:00
ioapic.c spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
ioapic.h spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
kalloc.c nits 2006-09-04 11:52:36 +00:00
lapic.c a few nits 2006-09-04 12:41:27 +00:00
lgrind.sty better printout 2006-08-29 17:50:19 +00:00
lgrindef index for printout 2006-09-03 14:38:10 +00:00
ls.c spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
main.c spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
Makefile nits 2006-09-06 01:25:41 +00:00
mkdir.c user-level programs: mkdir and rm 2006-08-14 21:22:13 +00:00
mkfs.c spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
mmu.h spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
mp.c spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
mp.h spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
Notes don't send keyboard interrupts to the second cpu, if we have only one cpu. 2006-09-03 17:34:09 +00:00
param.h spacing 2006-09-06 17:06:10 +00:00
picirq.c spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
pipe.c interrupts could be recursive since lapic_eoi() called before rti 2006-08-10 22:08:14 +00:00
printf.c spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
proc.c clear np->mem after freeing 2006-09-06 16:35:21 +00:00
proc.h nits 2006-08-29 21:35:30 +00:00
README nits 2006-09-04 11:52:36 +00:00
rm.c user-level programs: mkdir and rm 2006-08-14 21:22:13 +00:00
runoff New formatting scripts. 2006-09-05 15:50:55 +00:00
runoff.list tweak 2006-09-06 16:36:54 +00:00
setjmp.S spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
sh.c spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
sign.pl spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
spinlock.c spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
spinlock.h clean up stale error checks and panics 2006-08-29 14:45:45 +00:00
stat.h fstat 2006-08-12 04:33:50 +00:00
string.c spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
syscall.c complain if no disk 1 2006-08-30 18:55:06 +00:00
syscall.h i/o redirection in sh 2006-08-23 01:09:24 +00:00
trap.c spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
trapasm.S spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
traps.h spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
types.h uint32_t -> uint &c 2006-07-20 09:07:53 +00:00
ulib.c spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
umalloc.c spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
user.h nits 2006-09-06 01:25:41 +00:00
user1.c nitpicks 2006-07-17 01:25:22 +00:00
userfs.c spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
usertests.c prune unneeded panics and debug output 2006-08-29 19:06:37 +00:00
usys.S spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
vectors.pl spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
x86.h spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +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.

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/6.828/2006/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)

If you spot errors or have suggestions for improvement, please send
email to Frans Kaashoek and Robert Morris
({kaashoek,rtm}@csail.mit.edu).  This version is the very first one,
so don't be surprised if there are errors or the code is unclear.