set init name

formatting nits

only need a page

use bootstrap processor as specified by MP table. typically 0, but not
guaranteed.

some comment changes

fix build

get precedence of <, >, and | right
simplify

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)

fd_* => file_*

standardize various * conventions

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

prune unneeded panics and debug output

clean up stale error checks and panics
delete unused functions
a few comments

proc[0] can sleep(), at least after it gets to main00()
proc[0] calls iget(rootdev, 1) before forking init

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

oops

commented out code for cwd

link()

init creates console, opens 0/1/2, runs sh
sh accepts 0-argument commands (like userfs)
reads from console

interrupts could be recursive since lapic_eoi() called before rti
so fast interrupts overflow the kernel stack
fix: cli() before lapic_eoi()

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 key

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...

show more ...

devsw
checkpoint: write(fd,"hello\n",6) where fd is a console dev almost works

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

open()