• Nicholas Piggin's avatar
    powerpc: Add NMI IPI infrastructure · ddd703ca
    Nicholas Piggin authored
    Add a simple NMI IPI system that handles concurrency and reentrancy.
    
    The platform does not have to implement a true non-maskable interrupt,
    the default is to simply use the debugger break IPI message. This has
    now been co-opted for a general IPI message, and users (debugger and
    crash) have been reimplemented on top of the NMI system.
    Signed-off-by: default avatarNicholas Piggin <npiggin@gmail.com>
    [mpe: Incorporate incremental fixes from Nick]
    Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
    ddd703ca
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