Reto Buerki ad411e1a90 hw_x86_64_muen: Implement PIC take_request()
The Muen-specific PIC implementation provides the irq_occurred()
function which is used to register an IRQ with the PIC upon thread
exception.

The occurred IRQs are stored in a boolean array internally and handed
out to a CPU via take_request().
2015-08-27 13:48:25 +02:00
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