bootstrap stuffs

[Cort Dougan]

The same sort of thing (optimistic disable) is in the real-time linux
system.  I want to add it when that comes in.

}Mach maintains the current interrupt mask locally in RAM. When it
}disables an interrupt, it does so only in the mask, the controller gets
}updated only if this interrupt actually occurs. The enable code will
}enable it in the mask only if it has been disabled by the interrupt.


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