Add macros to access Schizo's PCI config space.

Use the correct IGN for the B side of schizo. Makes interrupts actually work
in the PCI slot of the v210.

ok jason@

keep track of what is a schizo and what is tomatillo

- stop using magic constants for the onboard error INOs (one was wrong anyway)
- setup pci error interrupts and do an interpretive dance with the registers

enable error interrupts and install handlers for same (the handlers don't do much yet)

nuke terms 3 & 4

branches: 1.4.4;
rearrange allocations and such so that this actually attaches (still panics
when attaching the pcibus... Still working on it =)

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@

- Add support for both of the schizo iommu's(There is an iommu per pbm)
- const the cfattach
- clean
- deal with the fact that the register property doesn't reflect the true
length of the register set (grr!)
- move away from home grown read/write_8 and use bus_space where possible

branches: 1.1.2;
Move stuff around like a crazy man... (split into var/reg)