Rename main0 to main.

test that fork fails gracefully

add ln

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

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].

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add kill

oops

add zombie program

add rule to generate init.sym

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.

dist rules

minor makefile fixes for printing
cut last line of readme so that readme fits on single page

new targets bochs and qemu

remove fstest

fix build

one regression test program

avoid system binary clashes

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)

runoff tweaks

clean up after mkfs

fd.* -> file.*

rm rm

nits

New formatting scripts.

The use/defs extraction in runoff still needs some work
for xv6 code style.

index for printout
some cleanup

prune unneeded panics and debug output