First pass at removing clauses 3 and 4 from NetBSD licenses.

Not sure what's more surprising: how long it took for NetBSD to
catch up to the rest of the BSDs (including UCB), or the amount of
code that NetBSD has claimed for itself without attributing to the
actual authors.

OK deraadt@

use the right capitalization for `SBus'

ok jmc@

sbus_establish() and the associated linked list in the sbus softc is now only
used to store a per-device reset callback, for use in sbusreset(). Except
sbusreset() has never, ever, been used since Torek's sbus code went in.
Time to recycle those wasted bits.

Preliminary xbox support: attaches, memory mapping and interrupts work, but
DMA transfers are not implemented yet, and are disabled (which causes drivers
to SBus cards on the xbox to fail to attach).

In practice, this allows frame buffers to work, maybe more devices; DMA
support will be worked on in the near future.

Remove the advertising clause in the UCB license which Berkeley
rescinded 22 July 1999. Proofed by myself and Theo.

Add support for the Sun Enterprise 450
Reduce the size of a GENERIC kernel by ~190k
Remove the nasty pointer/bus_space_handle_t casts
Adds debug bus_space code including the ability to trace
bus operations (it actually works now).

The following rules are now followed (and verfified by the debug
code):

1. A "bus_space_handle_t" may only be used with the
"bus_space_tag_t" that created it.
2. Only "bus_space_map()" may create "bus_space_handle_t"s.
3. A "bus_space_handle_t" may not be modified after it has
been created (other than being destroyed by "bus_space_unmap()").


Thanks to help from mcbride, marc, jason, drahn, to anyone that might
have slipped my mind at the moment.

ok jason@, deraadt@

First round of __P removal in sys

expose sbus_bus_addr() so cgsix actually compiles (oops)

branches: 1.2.4; 1.2.6;
RCSids

enough to get sbus.o from NetBSD