provide __HAVE_COMPAT_NETBSD32 and fix multiple include protection consistently.

Switch to new-style <sys/bus.h>.

Merge from matt-nb5-mips64.
Add pci support.
new interrupt code.
Adapt to new world order for MIPS

branches: 1.7.28; 1.7.32; 1.7.38; 1.7.40;
Now that __HAVE_TIMECOUNTER and __HAVE_GENERIC_TODR are invariants,
remove the conditionals and the code associated with the undef case.

Add timecounter support for sbmips machines and Broadcom SiByte CPUs.
Based on patch from joerg@, with tweaks by me to work with sbmips
non-use of the CP0 count/compare registers for clock interrupts.

branches: 1.5.2; 1.5.8;
Merge the ppcoea-renovation branch to HEAD.

This branch was a major cleanup and rototill of many of the various OEA
cpu based PPC ports that focused on sharing as much code as possible
between the various ports to eliminate near-identical copies of files in
every tree. Additionally there is a new PIC system that unifies the
interface to interrupt code for all different OEA ppc arches. The work
for this branch was done by a variety of people, too long to list here.

TODO:
bebox still needs work to complete the transition to -renovation.
ofppc still needs a bunch of work, which I will be looking at.
ev64260 still needs to be renovated
amigappc was not attempted.

NOTES:
pmppc was removed as an arch, and moved to a evbppc target.

branches: 1.4.10;
Generic soft interrupts are mandatory.

branches: 1.3.10; 1.3.18;
Convert sbmips to generic TODR. ok simonb@.

branches: 1.2.10; 1.2.22;
Switch to the MIPS generic soft interrupt code instead of using
port-specific code.

branches: 1.1.10; 1.1.12; 1.1.18; 1.1.34;
A basic port to the Broadcom/SiByte SB1250 evaluation board (the
"swarm"). Other SB-cpu boards will be supported by this port in
the future.

Includes support for on-chip ethernet and serial. Many features
still missing - notably SMP, PCI/LDT and IDE.

This code is provided by the Broadband Processor Business Unit at
Broadcom Corp with minor updates by me.