TODO list for MP branch (incomplete):

showstoppers for merge back to -current:

 - rewrite interrupt dispatch so that multi-level shared interrupts
   are no longer broken.

 - implement MI softint API

 - figure out why ahc on serverworks fails to find its interrupt.

 - careful code review of all diffs from -current

 - test and fix npx on i386 (npx exceptions through ISA interrupts).

"would be nice":

 - use atomic ops to modify ci_flags and cpu_feature to avoid losing bits.

 - verify that cyrix 486 isn't blown out of the water by machdep changes.

 - verify that cyrix clock chip bug fix isn't broken.

 - make sure BSP always attaches first!

 - stop all cpu's on shutdown.

 - try out mpbios+ioapic w/o MULTIPROCESSOR

 - figure out why cpu time accounting screws up bigtime:

> ld -Ttext c0100000 -e start -X -o netbsd ${SYSTEM_OBJ} vers.o
> text    data    bss     dec     hex     filename
> 3839853 369428  322400  4531681 4525e1  netbsd
> -1787494046.7u 681459032.2s 7:26.71 2421928.1% 0+0k 17+11379io 99pf+0w

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DONE:

 - Figure out why things are broken on !MULTIPROCESSOR
[2001/01/08  22:29:56  sommerfeld]
fixed three bugs; !MP kernel now comes up multiuser.

 - Sort out:
	- cpu feature probes [runs on new cpu]
	- identify_cpu() output [runs on BSP] 
	- cpu initialization [runs on new cpu];
   finish banishing most global variables containing cpu configuration 
   information to struct cpu_info
[2001/01/09  22:27:38  sommerfeld]
completed.  significant rewrite of cpu spinup required.