Commit graph

32 commits

Author SHA1 Message Date
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
2b19190c13 clean up stale error checks and panics
delete unused functions
a few comments
2006-08-29 14:45:45 +00:00
rtm
a6c28c9779 mkdir check error from mknod
chdir return -1 if target not a dir
2006-08-26 15:06:59 +00:00
rtm
5051da6de3 inode addrs[NDIRECT] -> NADDRS
fix race in mknod / creat
use last component in dirent in mknod, not path
2006-08-25 01:11:30 +00:00
rtm
bcfb84b6a9 big directory test 2006-08-24 19:21:19 +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
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
rtm
17e3cf15ba fix iget() bug that allocated in-use inode[] entries 2006-08-13 15:51:58 +00:00
rtm
211ff0c67e namei returns locked parent dir inode for create / unlink
don't hold fd table lock across idecref() (latter does block i/o)
idecref calls iput() in case last ref -> freeing inode
dir size is 512 * # blocks, so readi/writei &c work
unlink deletes dirent even if ip->nlink > 0
2006-08-13 12:22:44 +00:00
rtm
9e5970d596 link() 2006-08-13 02:12:44 +00:00
rtm
05e975511b zero out all of dirent.name when creating
don't increase length of directory
2006-08-12 22:44:26 +00:00
rtm
cd93074e5b LRU disk cache replacement 2006-08-12 22:34:13 +00:00
rtm
14938f9392 buffer cache, fifo replacement 2006-08-12 17:17:35 +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
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
8455980b27 exec arguments 2006-07-28 22:33:07 +00:00
rtm
9d3fb67141 namei 2006-07-21 22:10:40 +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
rtm
c41f1de5d4 file descriptors
pipes
2006-06-27 14:35:53 +00:00
rtm
bf49aedbed send console output to parallel port 2006-06-22 15:51:57 +00:00
rtm
a4c03dea09 primitive fork and exit system calls 2006-06-15 16:02:20 +00:00
rtm
cb83c71628 fix some trap bugs 2006-06-13 22:08:20 +00:00
rtm
0a70d042d0 more or less take traps/interrupts 2006-06-13 15:50:06 +00:00
rtm
55e95b16db import 2006-06-12 15:22:12 +00:00