powerpc/64s: system reset interrupt preserve HSRRs

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Code that uses HSRR registers is not required to clear MSR[RI] by
convention, however the system reset NMI itself may use HSRR
registers (e.g., to call OPAL) and clobber them.

Rather than introduce the requirement to clear RI in order to use
HSRRs, have system reset interrupt save and restore HSRRs.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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Nicholas Piggin 2019-02-26 18:51:08 +10:00 • committed by Michael Ellerman

parent ccd477028a

commit cbf2ba952a

1 changed files with 24 additions and 1 deletions

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arch/powerpc/kernel/traps.c

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