powerpc/6xx: Don't use SPRN_SPRG2 for storing stack pointer while in RTAS

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When calling RTAS, the stack pointer is stored in SPRN_SPRG2
in order to be able to restore it in case of machine check in RTAS.

As machine check is not a perfomance critical path, this patch
frees SPRN_SPRG2 by using a field in thread struct instead.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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This commit is contained in:

Christophe Leroy 2019-02-21 10:37:54 +00:00 • committed by Michael Ellerman

parent 40058337f2

commit 0df977eafc

5 changed files with 21 additions and 13 deletions

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3

arch/powerpc/include/asm/processor.h

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1

arch/powerpc/include/asm/reg.h

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3

arch/powerpc/kernel/asm-offsets.c

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5

arch/powerpc/kernel/entry_32.S

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22

arch/powerpc/kernel/head_32.S

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