powerpc: add SMP and IPI support

powerpc SMP support is very primitive and does not set up a first-class
runtime environment for secondary CPUs.

This reworks SMP support, and provides a complete C

powerpc: add SMP and IPI support

powerpc SMP support is very primitive and does not set up a first-class
runtime environment for secondary CPUs.

This reworks SMP support, and provides a complete C and harness
environment for the secondaries, including interrupt handling, as well
as IPI support.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Message-ID: <20240504122841.1177683-17-npiggin@gmail.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

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