Merge forward from matt-nb5-mips64.
New interrupt code.
mips64 support for DS5000/260.

Merge from matt-nb5-mips64
Merge mips-specific arch files.

Use the PROM bitmap, if available, to determine available memory. Also
add support of multiple memory segments so machines that allow mixed
memory sizes can utilize all available memory.

Fix thinko in comment.

Remove defines for VM_PHYSSEG_STRAT and VM_PHYSSEG_NOADD - these are
already in mips/include/vmparam.h. Now things work again (yo Andy!).

- Fix RCS Ids.
- Spacing.
- Protect from multiple inclusion in a consistant way (except on headers
that do nothing except function as mips header wrappers).

- Protect from multiple includes.
- Fix and beef up comments.
- G/C unused def.

Add a second memory free list, which holds the first 8M of RAM. This is
so that devices which must allocate DMA memory in this range (e.g.
PixelStamp graphics boards) have a better chance of doing s

Add a second memory free list, which holds the first 8M of RAM. This is
so that devices which must allocate DMA memory in this range (e.g.
PixelStamp graphics boards) have a better chance of doing so, without
an awful hack.

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Define one page free list, and put all pages on it.

DECstations have one physical memory segment.

Replace the following header files from src/sys/arch/pmax/include/
with versions that include equivalent files from <mips/include>.
(cvs magic copied the previous revisions, with history, to
src/

Replace the following header files from src/sys/arch/pmax/include/
with versions that include equivalent files from <mips/include>.
(cvs magic copied the previous revisions, with history, to
src/sys/arch/mips/include).

bsd-aout.h elf.h endian.h exec.h float.h ieeefp.h limit.h pcb.h proc.h
profile.h reg.h regdef.h setjmp.h stdarg.h vmparam.h

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new RCS ID format.

VM_MIN_ADDR -> 0

bsd 4.4-lite pmax port as ported to NetBSD

upgrade to bsd 4.4-lite code base. only mod is rcsids

pmax code from <ralphc@pyramid.com> & <rick@snowhite.cis.uoguelph.ca>