bump CPU_MAXNUM to 4, hardware exists and is being asked about on port-macppc@

gather per-CPU EEPROM contents if we have them

Don't expose port-specific if _MODULE is defined.
Don't _MACHINE_CPU_H_, _<PORT>_CPU_H_

Make all powerpc ports use a common Makefile.powerpc (except walnut)
Enforce -Wmissing-prototypes -Wstrict-prototypes for all ppc ports.
Split out macppc cpu support and make common to mpc6xx ports.

Make all powerpc ports use a common Makefile.powerpc (except walnut)
Enforce -Wmissing-prototypes -Wstrict-prototypes for all ppc ports.
Split out macppc cpu support and make common to mpc6xx ports. Make
other mpc6xx ports use it. Add evcnts for mpc6xx traps.

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use _KERNEL_OPT

Merge my MP tree. At this point, Daystar dual 604 card (i.e. Power Macintosh
9500/180MP and 9600/200MP) runs at least into single-user mode, possibly
multi-user mode (not stable yet).

Make want_resched and astpending per-CPU.
Add some per-CPU variables to cpu_info.

Partial syscall cleanup, as per other ports.

Add an argument to need_resched macro.

Make it compile with "options MULTIPROCESSOR".

First sweep at scheduler state cleanup. Collect MI scheduler
state into global and per-CPU scheduler state:

- Global state: sched_qs (run queues), sched_whichqs (bitmap
of non-empty run queues)

First sweep at scheduler state cleanup. Collect MI scheduler
state into global and per-CPU scheduler state:

- Global state: sched_qs (run queues), sched_whichqs (bitmap
of non-empty run queues), sched_slpque (sleep queues).
NOTE: These may collectively move into a struct schedstate
at some point in the future.

- Per-CPU state, struct schedstate_percpu: spc_runtime
(time process on this CPU started running), spc_flags
(replaces struct proc's p_schedflags), and
spc_curpriority (usrpri of processes on this CPU).

- Every platform must now supply a struct cpu_info and
a curcpu() macro. Simplify existing cpu_info declarations
where appropriate.

- All references to per-CPU scheduler state now made through
curcpu(). NOTE: this will likely be adjusted in the future
after further changes to struct proc are made.

Tested on i386 and Alpha. Changes are mostly mechanical, but apologies
in advance if it doesn't compile on a particular platform.

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Change char *bootpath to char bootpath[].

Define cpu_number() as discussed on tech-smp.

Remove unused codes.

Provide CACHELINESIZE when _STANDALONE is defined too.

Modify syncicache on PowerPC from an inline to a real function.
Support different cache line sizes with the same object code in userland.
While here, move the function to implementation name space.

Fix -Wpointer-arith warning.

Fix miscounting of length in syncicache().

configure() prototype is in <sys/device.h>

Fix CLKF_INTR() (from tsutsui@ceres.dti.ne.jp)

Initial import of macppc port.