Commit graph

60 commits

Author SHA1 Message Date
rsc a7d18bb6f0 comment tweaks; more informative process list 2007-08-08 08:38:38 +00:00
rsc 1656b1b232 move growproc up higher 2006-09-08 14:26:51 +00:00
rsc d911d83ca1 fix various comments 2006-09-08 13:55:43 +00:00
rsc b6cac0a53b check preconditions in sched 2006-09-07 16:54:00 +00:00
rsc ab17e3198b debugging prints 2006-09-07 15:45:38 +00:00
rsc 31085bb416 more comments 2006-09-07 14:12:30 +00:00
rsc 1133b215d8 more defensive programming 2006-09-07 01:56:22 +00:00
rsc 50e514be98 fd_* => file_* 2006-09-06 18:43:45 +00:00
rsc 9936bffa45 fd.* -> file.* 2006-09-06 18:40:28 +00:00
rsc 39593d2f1a struct fd -> struct file 2006-09-06 18:38:56 +00:00
rsc f552738889 no /* */ comments 2006-09-06 17:50:20 +00:00
rsc 9e9bcaf143 standardize various * conventions 2006-09-06 17:27:19 +00:00
rsc 0992df4b90 clear np->mem after freeing 2006-09-06 16:35:21 +00:00
kaashoek 21a88dd053 some pipe support in sh
bug in proc_wait
2006-09-06 15:32:21 +00:00
rtm 2aa4c3bc29 complain if no disk 1
lots of cleanup
2006-08-30 18:55:06 +00:00
rtm 18432ed5ed nits 2006-08-29 21:35:30 +00:00
rtm 7a37578e9e clear killed flag in exit
idecref cwd in exit
2006-08-29 19:59:52 +00:00
rtm dfcc5b997c prune unneeded panics and debug output 2006-08-29 19:06:37 +00:00
rtm 3b95801add i broke sbrk, fix it 2006-08-29 17:01:40 +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
kaashoek 81d5219998 bug in sbrk
test malloc
2006-08-24 19:24:36 +00:00
kaashoek ea2909b6b5 user-level malloc (untested)
nit in sbrk
indirect block
fix dup to share fd struct
2006-08-24 02:44:41 +00:00
kaashoek 8b58e81077 i/o redirection in sh
better parsing of sh commands (copied from jos sh)
cat: read from 1 if no args
sbrk system call, but untested
getpid system call
moved locks in keyboard intr, but why do we get intr w. null characters from keyboard?
2006-08-23 01:09:24 +00:00
kaashoek 8787cd01df chdir
cd in shell
nits in mkdir, ls, etc.
2006-08-19 23:41:34 +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 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 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 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
rtm 32630628a9 open() 2006-07-29 09:35:02 +00:00
rtm c59361f143 primitive exec 2006-07-27 21:10:00 +00:00
rtm bd228a8156 prevent longjmp / forkret from writing over tf->edi 2006-07-18 19:22:37 +00:00
rsc 0dd4253747 add ide_lock for sleep 2006-07-17 05:00:25 +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 ee9c7f3bfc goodbye PushRegs 2006-07-17 01:36:39 +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 ef2bd07ae4 standardize on not using foo_ prefix in struct foo 2006-07-16 15:41:47 +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 643b122b4a move everything having to do with proc_table_lock into proc.c 2006-07-15 17:24:54 +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
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 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