- Add an IMEN_MASK macro that returns the 8-bit bitmask of an atpic   interrupt source. - Only do an outb() to the PIC to clear a bit in imen if the bit is set. - Add a NUM_ISA_IRQS macro to replace uglier   'sizeof(array) / sizeof(member)' expressions along with a CTASSERT() to   ensure that the macro is correct.
- Add an IMEN_MASK macro that returns the 8-bit bitmask of an atpic
  interrupt source.
- Only do an outb() to the PIC to clear a bit in imen if the bit is set.
- Add a NUM_ISA_IRQS macro to replace uglier
  'sizeof(array) / sizeof(member)' expressions along with a CTASSERT() to
  ensure that the macro is correct.

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