Commit graph

107 commits

Author SHA1 Message Date
rsc
e0e7d07e5a test that fork fails gracefully 2007-08-24 20:20:23 +00:00
rsc
6bf2e5c898 add ln 2007-08-22 05:54:55 +00:00
rsc
f32f3638f4 Various cleanup:
- Got rid of dummy proc[0].  Now proc[0] is init.
 - Added initcode.S to exec /init, so that /init is
   just a regular binary.
 - Moved exec out of sysfile to exec.c
 - Moved code dealing with fs guts (like struct inode)
   from sysfile.c to fs.c.  Code dealing with system call
   arguments stays in sysfile.c
 - Refactored directory routines in fs.c; should be simpler.
 - Changed iget to return *unlocked* inode structure.
   This solves the lookup-then-use race in namei
   without introducing deadlocks.
   It also enabled getting rid of the dummy proc[0].
2007-08-21 19:22:08 +00:00
rsc
e0924827ee add kill 2007-08-08 08:50:23 +00:00
rsc
af689dcf7e oops 2007-08-08 08:40:08 +00:00
rsc
349ee132f0 add zombie program 2007-08-08 08:38:55 +00:00
rsc
ca3d577671 add rule to generate init.sym 2007-08-08 07:43:02 +00:00
rsc
b438eff6bf Have kernel build rule create kernel.sym, which can be
used in Bochs to make breakpoint setting easier:

	load-symbols "kernel.sym"
	vb 0x8:"main0"
	c
	disasm/25 "main0"
	vb 0x8:"main0"+0x5f
	c

etc.
2006-09-17 19:21:12 +00:00
rsc
db2d8e4b82 dist rules 2006-09-08 14:41:06 +00:00
kaashoek
5692823b1f minor makefile fixes for printing
cut last line of readme so that readme fits on single page
2006-09-07 21:03:13 +00:00
rsc
339a9beaf5 new targets bochs and qemu 2006-09-07 20:06:15 +00:00
kaashoek
52253dce65 remove fstest 2006-09-07 14:17:30 +00:00
rsc
7e019461c8 fix build 2006-09-07 14:10:52 +00:00
kaashoek
a64cd81342 one regression test program 2006-09-07 13:23:41 +00:00
rsc
94d7e25975 avoid system binary clashes 2006-09-07 13:07:39 +00:00
kaashoek
f70172129c run without lapic and ioapic, if they are not present
if no lapic available, use 8253pit for clock
now xv6 runs both on qemu (uniprocessor) and bochs (uniprocessor and MP)
2006-09-07 01:37:58 +00:00
rsc
2a55cc5501 runoff tweaks 2006-09-06 19:22:24 +00:00
rsc
f3fc72c5b6 clean up after mkfs 2006-09-06 19:11:39 +00:00
rsc
9936bffa45 fd.* -> file.* 2006-09-06 18:40:28 +00:00
rsc
61d03d0eef rm rm 2006-09-06 18:18:43 +00:00
kaashoek
d49a2d5386 nits 2006-09-06 01:25:41 +00:00
rsc
fae7779da7 New formatting scripts.
The use/defs extraction in runoff still needs some work
for xv6 code style.
2006-09-05 15:50:55 +00:00
kaashoek
97a5bba6d2 index for printout
some cleanup
2006-09-03 14:38:10 +00:00
rtm
dfcc5b997c prune unneeded panics and debug output 2006-08-29 19:06:37 +00:00
kaashoek
d7ce6545e7 better printout 2006-08-29 17:50:19 +00:00
kaashoek
b52151e032 some text in readme
generate postscript printout
2006-08-28 18:31:33 +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
rtm
ceb0e42796 proc[0] can sleep(), at least after it gets to main00()
proc[0] calls iget(rootdev, 1) before forking init
2006-08-16 01:56:00 +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
d7b3b802f4 user-level programs: mkdir and rm
shell parses arguments (very simplistic)
readme version of README (sh doesn't deal with capital characters)
printf recognizes %c
nicer output format for ls
2006-08-14 21:22:13 +00:00
kaashoek
1f544842ce fstat
primitive ls
2006-08-12 04:33:50 +00:00
rtm
17a856577f init creates console, opens 0/1/2, runs sh
sh accepts 0-argument commands (like userfs)
reads from console
2006-08-11 13:55:18 +00:00
kaashoek
28d9ef04dd printf
convert userfs to use printf
bfree
ifree
writei
start on unlink
2006-08-10 01:28:57 +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
kaashoek
c8b29f6d03 better interrupt plan---this one appears to work
ioapic
2006-08-04 18:12:31 +00:00
rtm
8455980b27 exec arguments 2006-07-28 22:33:07 +00:00
rtm
c59361f143 primitive exec 2006-07-27 21:10:00 +00:00
rtm
11a9947f1a bread
iget
mkfs makes a file system image
put this in your .bochsrc:
ata0-slave: type=disk, mode=flat, path="fs.img", cylinders=1024, heads=1, spt=1
2006-07-21 13:18:04 +00:00
rsc
857d60cb0c cleaner 2006-07-17 01:51:47 +00:00
rsc
f15a3ae263 cleaner 2006-07-17 01:36:32 +00:00
rsc
8a7eb80e47 fix main return type 2006-07-16 16:03:51 +00:00
rsc
b903b693ec tidy up 2006-07-16 15:35:18 +00:00
kaashoek
f27a68a24a extract lapic code from mp.c 2006-07-12 17:00:54 +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
7837c71b32 disable all interrupts when acquiring lock
user program that makes a blocking system call
2006-07-06 21:47:22 +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
rtm
c41f1de5d4 file descriptors
pipes
2006-06-27 14:35:53 +00:00
rtm
bf3903612d system call arguments 2006-06-26 15:11:19 +00:00
rtm
df5cc91659 compile "user programs"
curproc array
2006-06-22 20:47:23 +00:00
kaashoek
21a88fd487 checkpoint. booting second processor. stack is messed up, but thanks to cliff
and plan 9 code, at least boots and gets into C code.
2006-06-22 01:28:57 +00:00
kaashoek
7baa34a421 start on MP; detect MP configuration 2006-06-21 01:53:07 +00:00
rtm
ae6e8aa730 checkpoint 2006-06-16 20:29:25 +00:00
rtm
be0a7eacda sleep, wakeup, wait, exit 2006-06-15 19:58:01 +00:00
rtm
a4c03dea09 primitive fork and exit system calls 2006-06-15 16:02:20 +00:00
rtm
0a70d042d0 more or less take traps/interrupts 2006-06-13 15:50:06 +00:00
rtm
70a895f63c xx 2006-06-12 15:27:13 +00:00
rtm
55e95b16db import 2006-06-12 15:22:12 +00:00