Commit to running on an SMP (perhaps with only 1 core). Remove most code
from picirq.c and remove timer.c completely. Update runoff.list.

Remove trailing white space with:
for f in *.{h,c}; do sed -i .sed 's/[[:blank:]]*$//' $f; done
(Thanks to Nicolás Wolovick)

trap cleanup

IRQ_OFFSET -> T_IRQ0 (a trap number not an IRQ number)
T_SYSCALL 0x30 -> 0x40 (move out of IRQ range)

be consistent: no underscores in function names

oops - wrong bit (vic zandy)

comments; rename irq_ to pic_

delete unnecessary #include lines

Simplify MP hardware code.
Mainly delete unused constants and code.

Move mp_startthem to main.c as bootothers.

formatting nits

consistency.

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)

standardize various * conventions

spacing fixes: no tabs, 2-space indents (for rtm)

nits

fix iget() bug that allocated in-use inode[] entries

fix deadlock---iput(dp) asap
working unlink, but doesn't free dir blocks that become empty
remove out-of-date comment in ioapic

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

better interrupt plan---this one appears to work
ioapic