powerpc: Add NMI IPI infrastructure
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:Nicholas Piggin <npiggin@gmail.com> [mpe: Incorporate incremental fixes from Nick] Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
parent
2b4f3ac5
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