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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>
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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@ -250,6 +250,9 @@ struct thread_struct {
#ifdef CONFIG_PPC32
void *pgdir; /* root of page-table tree */
unsigned long ksp_limit; /* if ksp <= ksp_limit stack overflow */
#ifdef CONFIG_PPC_RTAS
unsigned long rtas_sp; /* stack pointer for when in RTAS */
#endif
#endif
/* Debug Registers */
struct debug_reg debug;