- Register the PCI bus error interrupt handler according to which half of   the bridge (PCI bus A or B) we are attaching to rather than registering   both handlers at once when attaching to the first half we encounter.   This is a bit cleaner as it corresponds to which PCI bus error interrupt   actually is assigned to the respective half by the OFW and allows to   collapse both PCI bus error interrupt handlers into one function easily. - Use the actual RID of the respective interrupt resource as index into   sc_irq_res and also use it when allocating the resource. For now this   is a bit cleaner and will be mandatory later on. - According to OpenSolaris the spare hardware interrupt is used as the   over-temperature interrupt in systems with Psycho bridges. Unlike as   with the SBus-based workstations I didn't manage to trigger it when   covering the fan outlets of an U60 but better be safe than sorry and   register a handler anyway.
- Register the PCI bus error interrupt handler according to which half of
  the bridge (PCI bus A or B) we are attaching to rather than registering
  both handlers at once when attaching to the first half we encounter.
  This is a bit cleaner as it corresponds to which PCI bus error interrupt
  actually is assigned to the respective half by the OFW and allows to
  collapse both PCI bus error interrupt handlers into one function easily.
- Use the actual RID of the respective interrupt resource as index into
  sc_irq_res and also use it when allocating the resource. For now this
  is a bit cleaner and will be mandatory later on.
- According to OpenSolaris the spare hardware interrupt is used as the
  over-temperature interrupt in systems with Psycho bridges. Unlike as
  with the SBus-based workstations I didn't manage to trigger it when
  covering the fan outlets of an U60 but better be safe than sorry and
  register a handler anyway.

MFC after:	1 month

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase