sanchayanmaity/xv6-cs450
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78 commits

Author SHA1 Message Date
rsc
c1b100e930 nits 2007-08-28 18:23:48 +00:00
rsc
9e82bfb04c rename 8253pit.c to timer.c 2007-08-28 04:40:58 +00:00
rsc
43baa1f224 nit 2007-08-28 04:14:32 +00:00
rsc
3341e30f6e nit 2007-08-28 04:13:24 +00:00
rsc
19b42cc078 Rename main0 to main. 2007-08-27 23:32:16 +00:00
rsc
558ab49f13 delete unnecessary #include lines 2007-08-27 23:26:33 +00:00
rsc
99b11b6c64 Simplify MP hardware code. 
Mainly delete unused constants and code.

Move mp_startthem to main.c as bootothers.
 2007-08-27 22:53:31 +00:00
rsc
b63bb0fd00 Clean up lapic code. 
One initialization function now, not three.
Use #defines instead of enums (consistent with other code, but sigh).

Still boots in Bochs in SMP mode.
 2007-08-27 16:57:13 +00:00
rsc
124f32ae38 tweak 2007-08-24 19:36:52 +00:00
rsc
eaea18cb9c PDF at http://am.lcs.mit.edu/~rsc/xv6.pdf 
Various changes made while offline.

 + bwrite sector argument is redundant; use b->sector.
 + reformatting of files for nicer PDF page breaks
 + distinguish between locked, unlocked inodes in type signatures
 + change FD_FILE to FD_INODE
 + move userinit (nee proc0init) to proc.c
 + move ROOTDEV to param.h
 + always parenthesize sizeof argument
 2007-08-22 06:01:32 +00:00
rsc
0073beee52 remove dead code 2007-08-21 19:22:27 +00:00
rsc
f32f3638f4 Various cleanup: 
- Got rid of dummy proc[0].  Now proc[0] is init.
 - Added initcode.S to exec /init, so that /init is
   just a regular binary.
 - Moved exec out of sysfile to exec.c
 - Moved code dealing with fs guts (like struct inode)
   from sysfile.c to fs.c.  Code dealing with system call
   arguments stays in sysfile.c
 - Refactored directory routines in fs.c; should be simpler.
 - Changed iget to return *unlocked* inode structure.
   This solves the lookup-then-use race in namei
   without introducing deadlocks.
   It also enabled getting rid of the dummy proc[0].
 2007-08-21 19:22:08 +00:00
rsc
bcca6c6bde shuffle fs.c in bottom-up order 2007-08-20 18:23:52 +00:00
rsc
8c4b5fc5b3 Gcc expects to be able to pick up the return 
address off the stack, so put one there for it.
(Bug was hidden by bad segment limits.)
 2007-08-14 04:56:30 +00:00
rsc
dca5b5ca2e avoid assignments in declarations 2007-08-10 17:17:42 +00:00
rsc
c664dd5d23 missing void 2007-08-08 09:32:39 +00:00
rsc
5d0fe3445b more bugs 2007-08-08 09:10:16 +00:00
rsc
b6dc6187f7 add DPL_USER constant 2007-08-08 09:02:42 +00:00
rsc
f83f7ce2f6 set init name 2007-08-08 08:57:55 +00:00
rsc
4fb684548a formatting nits 2006-09-08 15:14:43 +00:00
rsc
efb01c1dc0 only need a page 2006-09-08 15:09:48 +00:00
kaashoek
5cb7877e0f use bootstrap processor as specified by MP table. typically 0, but not 
guaranteed.
 2006-09-08 14:48:07 +00:00
kaashoek
8e1d1ec934 some comment changes 2006-09-08 14:36:44 +00:00
rsc
7e019461c8 fix build 2006-09-07 14:10:52 +00:00
kaashoek
e00baa9f5d get precedence of <, >, and | right 
simplify
 2006-09-07 02:15:28 +00:00
kaashoek
f70172129c run without lapic and ioapic, if they are not present 
if no lapic available, use 8253pit for clock
now xv6 runs both on qemu (uniprocessor) and bochs (uniprocessor and MP)
 2006-09-07 01:37:58 +00:00
rsc
50e514be98 fd_* => file_* 2006-09-06 18:43:45 +00:00
rsc
9e9bcaf143 standardize various * conventions 2006-09-06 17:27:19 +00:00
rsc
a650c606fe spacing fixes: no tabs, 2-space indents (for rtm) 2006-09-06 17:04:06 +00:00
rtm
dfcc5b997c prune unneeded panics and debug output 2006-08-29 19:06:37 +00:00
rtm
2b19190c13 clean up stale error checks and panics 
delete unused functions
a few comments
 2006-08-29 14:45:45 +00:00
rtm
ceb0e42796 proc[0] can sleep(), at least after it gets to main00() 
proc[0] calls iget(rootdev, 1) before forking init
 2006-08-16 01:56:00 +00:00
rtm
350e63f7a9 no more proc[] entry per cpu for idle loop 
each cpu[] has its own gdt and tss
no per-proc gdt or tss, re-write cpu's in scheduler (you win, cliff)
main0() switches to cpu[0].mpstack
 2006-08-15 22:18:20 +00:00
kaashoek
69332d1918 oops 2006-08-15 15:54:53 +00:00
kaashoek
e958c538fa commented out code for cwd 2006-08-15 15:53:46 +00:00
rtm
9e5970d596 link() 2006-08-13 02:12:44 +00:00
rtm
17a856577f init creates console, opens 0/1/2, runs sh 
sh accepts 0-argument commands (like userfs)
reads from console
 2006-08-11 13:55:18 +00:00
rtm
5be0039ce9 interrupts could be recursive since lapic_eoi() called before rti 
so fast interrupts overflow the kernel stack
fix: cli() before lapic_eoi()
 2006-08-10 22:08:14 +00:00
rtm
8a8be1b8c3 low-level keyboard input (not hooked up to /dev yet) 
fix acquire() to cli() *before* incrementing nlock
make T_SYSCALL a trap gate, not an interrupt gate
sadly, various crashes if you hold down a keyboard key...
 2006-08-10 02:07:10 +00:00
kaashoek
6fa5ffb56f devsw 
checkpoint: write(fd,"hello\n",6) where fd is a console dev almost works
 2006-08-09 16:04:04 +00:00
rtm
0e84a0ec6e fix race in holding() check in acquire() 
give cpu1 a TSS and gdt for when it enters scheduler()
and a pseudo proc[] entry for each cpu
cpu0 waits for each other cpu to start up
read() for files
 2006-08-08 19:58:06 +00:00
kaashoek
c8b29f6d03 better interrupt plan---this one appears to work 
ioapic
 2006-08-04 18:12:31 +00:00
rtm
32630628a9 open() 2006-07-29 09:35:02 +00:00
rtm
c59361f143 primitive exec 2006-07-27 21:10:00 +00:00
rtm
2927081628 uint32_t -> uint &c 2006-07-20 09:07:53 +00:00
rsc
b5f17007f4 standarize on unix-like lowercase struct names 2006-07-17 01:58:13 +00:00
rsc
b5ee516575 add uint and standardize on typedefs instead of unsigned 2006-07-17 01:52:13 +00:00
rsc
6e6a1dd7d7 various little fixes that should have been in earlier checkins 2006-07-16 16:06:03 +00:00
rsc
8a7eb80e47 fix main return type 2006-07-16 16:03:51 +00:00
rsc
b74f4b57ae Keep interrupts disabled during startup. 2006-07-16 15:50:13 +00:00