xv6-cs450

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kaashoek 7abf49d2f2 remove duplication don't use the same name for two different pieces of code		2006-09-03 15:39:29 +00:00
.cvsignore	Changes to allow use of native x86 ELF compilers, which on my	2006-07-11 01:07:40 +00:00
asm.h	remove duplication	2006-09-03 15:39:29 +00:00
bio.c	complain if no disk 1	2006-08-30 18:55:06 +00:00
bootasm.S	remove duplication	2006-09-03 15:39:29 +00:00
bootmain.c	uint32_t -> uint &c	2006-07-20 09:07:53 +00:00
bootother.S	remove duplication	2006-09-03 15:39:29 +00:00
buf.h	LRU disk cache replacement	2006-08-12 22:34:13 +00:00
cat.c	i/o redirection in sh	2006-08-23 01:09:24 +00:00
console.c	remove duplication	2006-09-03 15:39:29 +00:00
defs.h	complain if no disk 1	2006-08-30 18:55:06 +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	centralize credits	2006-09-03 15:10:33 +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	complain if no disk 1	2006-08-30 18:55:06 +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	remove duplication	2006-09-03 15:39:29 +00:00
init.c	prune unneeded panics and debug output	2006-08-29 19:06:37 +00:00
ioapic.c	fix iget() bug that allocated in-use inode[] entries	2006-08-13 15:51:58 +00:00
ioapic.h	better interrupt plan---this one appears to work	2006-08-04 18:12:31 +00:00
kalloc.c	complain if no disk 1	2006-08-30 18:55:06 +00:00
lapic.c	centralize credits	2006-09-03 15:10:33 +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	i/o redirection in sh	2006-08-23 01:09:24 +00:00
main.c	prune unneeded panics and debug output	2006-08-29 19:06:37 +00:00
Makefile	index for printout	2006-09-03 14:38:10 +00:00
mkdir.c	user-level programs: mkdir and rm	2006-08-14 21:22:13 +00:00
mkfs.c	fix writing the indirect block	2006-08-25 01:25:22 +00:00
mmu.h	centralize credits	2006-09-03 15:10:33 +00:00
mp.c	prune unneeded panics and debug output	2006-08-29 19:06:37 +00:00
mp.h	centralize credits	2006-09-03 15:10:33 +00:00
Notes	complain if no disk 1	2006-08-30 18:55:06 +00:00
param.h	clean up stale error checks and panics	2006-08-29 14:45:45 +00:00
picirq.c	remove duplication	2006-09-03 15:39:29 +00:00
pipe.c	interrupts could be recursive since lapic_eoi() called before rti	2006-08-10 22:08:14 +00:00
printf.c	user-level programs: mkdir and rm	2006-08-14 21:22:13 +00:00
proc.c	complain if no disk 1	2006-08-30 18:55:06 +00:00
proc.h	nits	2006-08-29 21:35:30 +00:00
README	centralize credits	2006-09-03 15:10:33 +00:00
rm.c	user-level programs: mkdir and rm	2006-08-14 21:22:13 +00:00
setjmp.S	rename swtch.S to setjmp.S	2006-07-16 15:40:51 +00:00
sh.c	clear killed flag in exit	2006-08-29 19:59:52 +00:00
sign.pl	import	2006-06-12 15:22:12 +00:00
spinlock.c	prune unneeded panics and debug output	2006-08-29 19:06:37 +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	complain if no disk 1	2006-08-30 18:55:06 +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	i broke sbrk, fix it	2006-08-29 17:01:40 +00:00
trapasm.S	prune unneeded panics and debug output	2006-08-29 19:06:37 +00:00
traps.h	remove duplication	2006-09-03 15:39:29 +00:00
types.h	uint32_t -> uint &c	2006-07-20 09:07:53 +00:00
ulib.c	i/o redirection in sh	2006-08-23 01:09:24 +00:00
umalloc.c	kill user process when it generates an unhandled trap (e.g., 13)	2006-08-25 00:43:17 +00:00
user.h	bug in sbrk	2006-08-24 19:24:36 +00:00
user1.c	nitpicks	2006-07-17 01:25:22 +00:00
userfs.c	fix bugs in indirect-file code	2006-08-24 17:28:01 +00:00
usertests.c	prune unneeded panics and debug output	2006-08-29 19:06:37 +00:00
usys.S	i/o redirection in sh	2006-08-23 01:09:24 +00:00
vectors.pl	complain if no disk 1	2006-08-30 18:55:06 +00:00
x86.h	remove duplication	2006-09-03 15:39:29 +00:00

README

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

xv6 is inspired by the following work by Lions about Unix version 6:

- Lions' Commentary on UNIX' 6th Edition, John Lions, 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.

Code was used from the following sources:
    JOS (asm.h, elf.h, mmu.h, bootasm.S, ide.c, and others)
    Plan 9 (bootother.S, mp.h, mp.c, ioapic.h, lapic.c)
    FreeBSD (ioapic.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.