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2006-09-07check preconditions in schedrsc1-0/+5
2006-09-07debugging printsrsc1-0/+16
2006-09-07more commentsrsc1-1/+4
2006-09-07more defensive programmingrsc1-1/+4
2006-09-06fd_* => file_*rsc1-2/+2
2006-09-06fd.* -> file.*rsc1-1/+1
2006-09-06struct fd -> struct filersc1-6/+6
2006-09-06no /* */ commentsrsc1-5/+4
2006-09-06standardize various * conventionsrsc1-18/+18
2006-09-06clear np->mem after freeingrsc1-0/+1
2006-09-06some pipe support in shkaashoek1-2/+2
bug in proc_wait
2006-08-30complain if no disk 1rtm1-1/+1
lots of cleanup
2006-08-29nitsrtm1-9/+5
2006-08-29clear killed flag in exitrtm1-0/+4
idecref cwd in exit
2006-08-29prune unneeded panics and debug outputrtm1-28/+1
2006-08-29i broke sbrk, fix itrtm1-3/+3
2006-08-29clean up stale error checks and panicsrtm1-4/+4
delete unused functions a few comments
2006-08-24bug in sbrkkaashoek1-3/+2
test malloc
2006-08-24user-level malloc (untested)kaashoek1-4/+5
nit in sbrk indirect block fix dup to share fd struct
2006-08-23i/o redirection in shkaashoek1-0/+18
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?
2006-08-19chdirkaashoek1-2/+2
cd in shell nits in mkdir, ls, etc.
2006-08-15no more proc[] entry per cpu for idle looprtm1-39/+30
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
2006-08-15commented out code for cwdkaashoek1-0/+3
2006-08-13link()rtm1-3/+0
2006-08-10interrupts could be recursive since lapic_eoi() called before rtirtm1-2/+14
so fast interrupts overflow the kernel stack fix: cli() before lapic_eoi()
2006-08-08fix race in holding() check in acquire()rtm1-4/+6
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
2006-07-29open()rtm1-2/+4
2006-07-27primitive execrtm1-0/+3
2006-07-18prevent longjmp / forkret from writing over tf->edirtm1-1/+1
2006-07-17add ide_lock for sleeprsc1-0/+12
2006-07-17standarize on unix-like lowercase struct namesrsc1-3/+3
2006-07-17add uint and standardize on typedefs instead of unsignedrsc1-6/+6
2006-07-17goodbye PushRegsrsc1-1/+1
2006-07-17nitpicksrsc1-1/+1
2006-07-16Eliminate annoying Pseudodesc structure.rsc1-4/+3
Eliminate unnecessary parts of mmu.h.
2006-07-16standardize on not using foo_ prefix in struct foorsc1-11/+11
2006-07-16Rename fd_reference to more suggestive fd_incref.rsc1-1/+1
(Fd_reference sounds like it might just return the ref count.)
2006-07-16Attempt to clean up newproc somewhat.rsc1-51/+67
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.
2006-07-16New scheduler.rsc1-153/+168
Removed cli and sti stack in favor of tracking number of locks held on each CPU and explicit conditionals in spinlock.c.
2006-07-15move everything having to do with proc_table_lock into proc.crsc1-0/+50
2006-07-15no more recursive locksrtm1-23/+52
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
2006-07-12passes both usertestsrtm1-8/+10
exit had acquire where I meant release swtch now checks that you hold no locks
2006-07-12i think my cmpxchg use was wrong in acquirertm1-2/+23
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)
2006-07-12cvs add spinlock.hrtm1-1/+2
fix race in schedule()
2006-07-12no more big kernel lockrtm1-21/+46
succeeds at usertests.c pipe test
2006-07-11pre-empt both user and kernel, in clock interruptrtm1-0/+42
usertest.c tests pre-emption kill()
2006-07-11Changes to allow use of native x86 ELF compilers, which on myrsc1-39/+44
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.
2006-07-01swtch saves callee-saved registersrtm1-17/+27
swtch idles on per-CPU stack, not on calling process's stack fix pipe bugs usertest.c tests pipes, fork, exit, close
2006-06-27file descriptorsrtm1-0/+9
pipes
2006-06-26system call return valuesrtm1-0/+1
initialize 2nd cpu's idt
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