• Philippe Gerum's avatar
    arm64/ipipe: multiplex IPIs · e401d452
    Philippe Gerum authored
    SGI8-15 can be reserved for the exclusive use of the firmware. The
    ARM64 kernel currently uses six of them (NR_IPI), and the pipeline
    needs to define three more for conveying out-of-band events
    (i.e. reschedule, hrtimer and critical IPIs). Therefore we have to
    multiplex nine inter-processor events over eight SGIs (SGI0-7).
    
    This patch changes the IPI management in order to multiplex all
    regular (in-band) IPIs over SGI0, reserving SGI1-3 for out-of-band
    events.
    e401d452
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