Commit graph

166 commits

Author SHA1 Message Date
rsc
f15a3ae263 cleaner 2006-07-17 01:36:32 +00:00
rsc
c54c79267f nitpicks 2006-07-17 01:25:22 +00:00
rsc
564f787e91 Eliminate annoying Pseudodesc structure.
Eliminate unnecessary parts of mmu.h.
2006-07-16 16:55:52 +00:00
rsc
6e6a1dd7d7 various little fixes that should have been in earlier checkins 2006-07-16 16:06:03 +00:00
rsc
84d79573da more idiomatic c 2006-07-16 16:05:37 +00:00
rsc
96e16b96c9 no memlayout.h 2006-07-16 16:04:44 +00:00
rsc
9692d5add5 was empty; gone 2006-07-16 16:04:15 +00:00
rsc
8a7eb80e47 fix main return type 2006-07-16 16:03:51 +00:00
rsc
b75c11b20e add %s to cprintf for cons_puts 2006-07-16 16:00:03 +00:00
rsc
b74f4b57ae Keep interrupts disabled during startup. 2006-07-16 15:50:13 +00:00
rsc
ef2bd07ae4 standardize on not using foo_ prefix in struct foo 2006-07-16 15:41:47 +00:00
rsc
6b765c480f rename swtch.S to setjmp.S 2006-07-16 15:40:51 +00:00
rsc
b53f99d0d2 standardize on #include "foo" not <foo> 2006-07-16 15:40:05 +00:00
rsc
4763a042c8 add minimal comments to generator vector table 2006-07-16 15:38:56 +00:00
rsc
679a977cb2 remove acquire1 and release1 2006-07-16 15:38:13 +00:00
rsc
f3d290220f add cons_puts for atomic (readable) output 2006-07-16 15:38:00 +00:00
rsc
9b37d1bfaa Add user.h for prototypes.
Add cons_puts for cleaner output.
2006-07-16 15:36:31 +00:00
rsc
b903b693ec tidy up 2006-07-16 15:35:18 +00:00
rsc
72fef4f855 Don't kill process when inside kernel. 2006-07-16 02:09:45 +00:00
rsc
4ed974f5ea more name cleanup 2006-07-16 02:04:58 +00:00
rsc
6f2b626d28 remove non-idiomatic increment/decrement 2006-07-16 01:52:22 +00:00
rsc
51716a869c Rename fd_reference to more suggestive fd_incref.
(Fd_reference sounds like it might just return the ref count.)
2006-07-16 01:49:03 +00:00
rsc
856e1fc1ad Attempt to clean up newproc somewhat.
Also remove all calls to memcpy in favor of
memmove, which has defined semantics when
the ranges overlap.  The fact that memcpy was
working in console.c to scroll the screen is not
guaranteed by all implementations.
2006-07-16 01:47:40 +00:00
rsc
65bd8e139a New scheduler.
Removed cli and sti stack in favor of tracking
number of locks held on each CPU and explicit
conditionals in spinlock.c.
2006-07-16 01:15:28 +00:00
rsc
40a2a08319 Undo change from this morning that wasn't intended to get in. 2006-07-16 01:12:57 +00:00
rsc
643b122b4a move everything having to do with proc_table_lock into proc.c 2006-07-15 17:24:54 +00:00
rsc
3497670122 silence load_icode signedness warning 2006-07-15 17:23:17 +00:00
rsc
67a9314ad1 Add void for ANSI C 2006-07-15 17:17:00 +00:00
rsc
7f419a0d29 Change fetchint, fetcharg, and putint to return -1 on error, 0 on success.
They had been returning 0 on error, 1 on success, but all the callers
were checking for return value < 0.
2006-07-15 17:13:56 +00:00
rtm
46bbd72f3e no more recursive locks
wakeup1() assumes you hold proc_table_lock
sleep(chan, lock) provides atomic sleep-and-release to wait for condition
ugly code in swtch/scheduler to implement new sleep
fix lots of bugs in pipes, wait, and exit
fix bugs if timer interrupt goes off in schedule()
console locks per line, not per byte
2006-07-15 12:03:57 +00:00
kaashoek
d9872ffa95 and the file 2006-07-12 17:19:24 +00:00
kaashoek
f27a68a24a extract lapic code from mp.c 2006-07-12 17:00:54 +00:00
rtm
6eb6f10c56 passes both usertests
exit had acquire where I meant release
swtch now checks that you hold no locks
2006-07-12 15:35:33 +00:00
rtm
8148b6ee53 i think my cmpxchg use was wrong in acquire
nesting cli/sti: release shouldn't always enable interrupts
separate setup of lapic from starting of other cpus, so cpu() works earlier
flag to disable locking in console output
make locks work even when curproc==0
(still crashes in clock interrupt)
2006-07-12 11:15:38 +00:00
rtm
664324745e cvs add spinlock.h
fix race in schedule()
2006-07-12 09:10:25 +00:00
rtm
4e8f237be8 no more big kernel lock
succeeds at usertests.c pipe test
2006-07-12 01:48:35 +00:00
rtm
b41b38d0da give each cpu its own clock, so that preemption works on cpu 1 2006-07-11 18:45:27 +00:00
rtm
b548df152b pre-empt both user and kernel, in clock interrupt
usertest.c tests pre-emption
kill()
2006-07-11 17:39:45 +00:00
rsc
5ce9751cab Changes to allow use of native x86 ELF compilers, which on my
Linux 2.4 box using gcc 3.4.6 don't seem to follow the same
conventions as the i386-jos-elf-gcc compilers.
Can run make 'TOOLPREFIX=' or edit the Makefile.

curproc[cpu()] can now be NULL, indicating that no proc is running.
This seemed safer to me than having curproc[0] and curproc[1]
both pointing at proc[0] potentially.

The old implementation of swtch depended on the stack frame layout
used inside swtch being okay to return from on the other stack
(exactly the V6 you are not expected to understand this).
It also could be called in two contexts: at boot time, to schedule
the very first process, and later, on behalf of a process, to sleep
or schedule some other process.

I split this into two functions: scheduler and swtch.

The scheduler is now a separate never-returning function, invoked
by each cpu once set up.  The scheduler looks like:

	scheduler() {
		setjmp(cpu.context);

		pick proc to schedule
		blah blah blah

		longjmp(proc.context)
	}

The new swtch is intended to be called only when curproc[cpu()] is not NULL,
that is, only on behalf of a user proc.  It does:

	swtch() {
		if(setjmp(proc.context) == 0)
			longjmp(cpu.context)
	}

to save the current proc context and then jump over to the scheduler,
running on the cpu stack.

Similarly the system call stubs are now in assembly in usys.S to avoid
needing to know the details of stack frame layout used by the compiler.

Also various changes in the debugging prints.
2006-07-11 01:07:40 +00:00
kaashoek
7ea6c9d197 queue with disk requests 2006-07-10 19:06:48 +00:00
kaashoek
084f21430c oops 2006-07-10 16:27:15 +00:00
kaashoek
72ea69fbdf read the disk using interrupts 2006-07-10 13:08:37 +00:00
kaashoek
7837c71b32 disable all interrupts when acquiring lock
user program that makes a blocking system call
2006-07-06 21:47:22 +00:00
kaashoek
b22d898297 timer interrupts
disk interrupts (assuming bochs has a bug)
2006-07-05 20:00:14 +00:00
rtm
8b4e2a08fe swtch saves callee-saved registers
swtch idles on per-CPU stack, not on calling process's stack
fix pipe bugs
usertest.c tests pipes, fork, exit, close
2006-07-01 21:26:01 +00:00
kaashoek
f7cea12b38 disable interrupts when holding kernel lock 2006-06-28 16:44:41 +00:00
kaashoek
bd303ed060 timer interrupts 2006-06-28 16:35:03 +00:00
rtm
c41f1de5d4 file descriptors
pipes
2006-06-27 14:35:53 +00:00
rtm
b61c2547b8 system call return values
initialize 2nd cpu's idt
2006-06-26 20:31:52 +00:00
kaashoek
a44ee3cde8 stick mpstack in cpu structure 2006-06-26 16:40:43 +00:00