Use PAGE_SIZE rather than NBPG.

Eliminate commons. (including a few unused or mismatched ones).

o replace definitions by declarations in header files
o put definitions where due
o cleanup some types (u_int -> vaddr_t's for example)
o minor other cleanup

- ANSIfy
- remove some trailing spaces/tabs
- minor style nits

vm_offset_t -> vaddr_t/paddr_t

Rename the watchdog enable bit to reflect its polarity.

Use the right microsecond delay address. To achieve this, also map that
piece of hardware into kernel virtual memory (was only a guess 'til now).
XXX Unfortunately, the hardware vendor reserves the r

Use the right microsecond delay address. To achieve this, also map that
piece of hardware into kernel virtual memory (was only a guess 'til now).
XXX Unfortunately, the hardware vendor reserves the right to change this in
future DraCo revisions. We must rethink delay() and DELAY(), at least for the
DraCo, soon.

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First part of M68060 and DraCo support.

* for the M68060 part: store buffer and branch target cache aren't
enabled yet (this needs cleanup of lots of locore.s code which is a
maze of little pass

First part of M68060 and DraCo support.

* for the M68060 part: store buffer and branch target cache aren't
enabled yet (this needs cleanup of lots of locore.s code which is a
maze of little passages, all a little different) (and it wasn't yet
tested in an accellerated Amiga, only in the DraCo).

I've included a workaround for 2 of the CPU bugs in chips with Masks
1F43G and earlier, but didn't bother to deal with the can of worms
in the [0-3]D11W chips. Be sure to get "68060 rev. 1" or more
reported at kernel startup time, or at least mention it (or the mask
revision, if available) when reporting problems.

* for the DraCo: only machines with a CIA timer.

I assigned machine id 32000+nn (0x7Dnn), where n is the machine
readable Quicklogic custom chip revision (also printed at boot
time). "Guaranteed to work" up to rev. 3, newer DraCo's aren't
guaranteed to have any CIA (we don't have a driver for the new timer
yet).

Supported are:

- MF-II keyboards on the native interface and A3000 keyboards via
the CIA.
- builtin SCSI interface (yet another instance of siop)
- CIA timer.
- Zorro II devices which don't do DMA (don't get mapped to Zorro II
address space in the DraCo)
- "local bus" devices which are autoconfigured by the boot rom
(should be all); only an Altais driver is there (looks like a Retina Z3)

Not yet supported are:

- native timer of newer machines.
- Real Time Clock.
- serial, parallel + floppy on the SuperIO chip (that is also: no mouse)

XXX You need an enhanced boot loader, which will committed in a few days.

XXX std.draco should and will go away.

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