powerpc/8xx: don't use r12/SPRN_SPRG_SCRATCH2 in TLB Miss handlers

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This patch reworks the TLB Miss handler in order to not use r12
register, hence avoiding having to save it into SPRN_SPRG_SCRATCH2.

In the DAR Fixup code we can now use SPRN_M_TW, freeing
SPRN_SPRG_SCRATCH2.

Then SPRN_SPRG_SCRATCH2 may be used for something else in the future.

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

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Christophe Leroy 2018-11-29 14:07:24 +00:00 • committed by Michael Ellerman

parent 55c8fc3f49

commit 74fabcadfd

1 changed files with 49 additions and 61 deletions

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arch/powerpc/kernel/head_8xx.S

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