Adrian-Ken Rueegsegger 780863007d hw_x86_64: Use PAUSE instruction in wait_for_interrupt
Add spin loop hint by means of the PAUSE instruction since
wait_for_interrupt is called in a busy loop. This should improve processor
performance and reduce power consumption.

Note: HLT cannot be used since it is a privileged instruction and the idle
      thread is executed in userspace.
2015-08-21 11:00:59 +02:00
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