rsc
0ca9ca0c55
slight rearrangement; sleep on b not buf.
2009-05-31 00:23:00 +00:00
rsc
d827c8f3c8
Add MIT license file; update xv6-rev2.tar.gz with LICENSE.
...
Other files unchanged.
2009-05-26 16:58:33 +00:00
rsc
2157576107
be consistent: no underscores in function names
2009-03-08 22:07:13 +00:00
rsc
b7f653dc49
xv6: boot loader adjustments
...
do Bochs breakpoint and spin in bootasm.S.
not needed in bootmain too.
fix readseg bug (rounding of va).
zero segments when memsz > filesz.
no need to clear BSS in kernel main.
make bootother.S like bootasm.S
2009-03-08 21:41:30 +00:00
rsc
8220135362
xv6: use stosb for memset
2009-03-08 21:38:30 +00:00
rsc
c396d065d3
xv6/x86.h: add stosb, fix bugs in insl/outsl (rep not repne)
2009-03-08 21:27:57 +00:00
rsc
4003e9bed8
xv6/x86.h: inline assembly cleanup
2009-03-08 20:56:38 +00:00
rtm
8eb20827c2
Explain why itrunc() is OK w.r.t. crashes.
2008-10-20 18:05:48 +00:00
kolya
15a2693637
try harder to get directory refcounts right
2008-10-17 12:42:13 +00:00
kolya
f3e87bc838
make mkdir crash-safer, as noticed by many students on midterm
2008-10-16 15:18:49 +00:00
kolya
e1626709d6
free the indirect block
2008-10-16 15:00:23 +00:00
kolya
e670a48358
as rtm noticed, avoid doubly-freeing pipe page
2008-10-15 17:42:56 +00:00
kolya
deca9fef83
indent
2008-10-15 05:15:32 +00:00
kolya
c100d9ee2d
cleaner swtch.S
2008-10-15 05:14:10 +00:00
kolya
228e500a0c
save cpus.intena in sched(), so we get the right EFLAGS.IF value once a
...
timer-preempted kernel thread resumes execution in trap() after yield().
otherwise the kernel could get an arbitrary number of nested timer intrs.
2008-10-15 05:01:39 +00:00
kolya
15ce79de14
check cp->killed before returning to user from a timer interrupt
2008-10-15 04:57:02 +00:00
kolya
00ce31c09c
update .cvsignore
2008-10-15 04:54:24 +00:00
kolya
289bbef733
minor cleanup
2008-10-12 20:19:16 +00:00
kolya
f73b81205e
minor cleanup with STUB macro
2008-10-12 19:54:11 +00:00
kolya
c780dbf967
include explicitly initialized globals (int x = 0;) in cross-refs,
...
also thanks to greg price.
2008-10-12 18:45:30 +00:00
kolya
6186836d28
fix: when two names only differed in case, crossrefs only included one of them.
...
thanks to greg price.
2008-10-12 18:33:14 +00:00
rtm
2ce40d7088
be clear what the root i-number is
2008-10-08 18:57:13 +00:00
rtm
be38c8413e
document lock->locked=0 vs xchg(&lock->locked, 0)
2008-09-28 10:53:54 +00:00
kolya
0159c8bb94
trap 9 does not push ec: fix from Greg Price <price@mit.edu>
2008-09-24 18:20:56 +00:00
kolya
c7317d4dc7
always save and restore %fs, %gs to ensure old segment entries are never
...
accessible to user from the hidden CPU segment registers.
2008-09-24 01:48:31 +00:00
rtm
adcd16c3f7
restore std toolprefix
2008-09-11 10:22:01 +00:00
rtm
4651d04ad1
omit *.d from tar file
2008-09-11 10:20:40 +00:00
kaashoek
e9ae6f5cbe
add copyright notice
2008-09-09 11:42:44 +00:00
kolya
f68317533e
make bochsrc work for bochs 2.2.6
2008-09-03 14:10:47 +00:00
kolya
35a6cf84ec
make pdf, ps, tarball
2008-09-03 14:05:52 +00:00
kaashoek
e87dca5cc5
nits in index.txt
...
add slides for shell, x86 intro, x86 virtual memory (deleted JOS from slides)
2008-09-03 12:29:44 +00:00
rsc
f53494c28e
DO NOT MAIL: xv6 web pages
2008-09-03 04:50:04 +00:00
rtm
ee3f75f229
simplify growproc
2008-08-28 17:57:47 +00:00
rtm
98754d687e
avoid a bug w/ exit()
2008-08-28 00:53:24 +00:00
rtm
56082468ea
the old explanation of AP startup might have been correct, but
...
I understand this one.
2008-08-28 00:52:05 +00:00
kolya
02cc595f28
clean up circular buffers, so pipe can queue 512 bytes rather than 511
2008-08-22 00:26:22 +00:00
kolya
5c5470a2fa
fix obvious printf nits after reading through code
2008-08-21 23:24:02 +00:00
rsc
1808b2f1b3
now rev2
2008-08-20 18:00:35 +00:00
rsc
150785a1fd
add nice font
2008-08-20 18:00:24 +00:00
rsc
9b62657ecd
formatting updates
2008-08-20 18:00:13 +00:00
rsc
5b7f8cbe7c
bochs faster
2008-08-20 17:59:29 +00:00
rsc
174729fc55
xv6: latest (as of January 2008)
2008-08-20 17:46:32 +00:00
rsc
eadbd55af2
oops - wrong bit (vic zandy)
2007-12-20 18:27:07 +00:00
rsc
c2258bf4d2
fork minibug
2007-11-28 20:47:22 +00:00
rsc
4f06ae0d42
More complete lapic startup (thanks Silas)
2007-11-28 20:47:10 +00:00
rsc
a6c4711a38
bda[0xE] is a 16-bit segment number,
...
not a real address. So shift 4.
Reported by Silas.
Jim McKie says this code only matters
on ancient EISA MP systems.
2007-11-28 20:17:04 +00:00
rtm
fd6b029401
proc_wait -> wait
2007-10-20 18:25:38 +00:00
rsc
949352af66
Model verifying that wakeup really
...
can be called after release without
causing deadlock.
2007-10-12 04:21:04 +00:00
rsc
943fd378a1
Incorporate new understanding of/with Intel SMP spec.
...
Dropped cmpxchg in favor of xchg, to match lecture notes.
Use xchg to release lock, for future protection and to
keep gcc from acting clever.
2007-10-01 20:43:15 +00:00
rsc
9fd9f80431
Re: why cpuid() in locking code?
...
rtm wrote:
> Why does acquire() call cpuid()? Why does release() call cpuid()?
The cpuid in acquire is redundant with the cmpxchg, as you said.
I have removed the cpuid from acquire.
The cpuid in release is actually doing something important,
but not on the hardware. It keeps gcc from reordering the
lock->locked assignment above the other two during optimization.
(Not that current gcc -O2 would choose to do that, but it is allowed to.)
I have replaced the cpuid in release with a "gcc barrier" that
keeps gcc from moving things around but has no hardware effect.
On a related note, I don't think the cpuid in mpmain is necessary,
for the same reason that the cpuid wasn't needed in release.
As to the question of whether
acquire();
x = protected;
release();
might read protected after release(), I still haven't convinced
myself whether it can. I'll put the cpuid back into release if
we determine that it can.
Russ
2007-09-30 14:30:04 +00:00
