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[PPC] 8xx: Fix r3 trashing due to 8MB TLB page instantiation

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Instantiation of 8MB pages on the TLB cache for the kernel static
mapping trashes r3 register on !CONFIG_8xx_CPU6 configurations.
This ensures r3 gets saved and restored.

This has been posted to linuxppc-embedded by Marcelo Tosatti
<marcelo@kvack.org>, but only an incomplete version of the patch
has been applied in c51e078f82096a7d35ac8ec2416272e843a0e1c4.
This patch adds the rest of the fix.

Signed-off-by: Jochen Friedrich <jochen@scram.de>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Jochen Friedrich 2007-08-28 13:20:48 +02:00 committed by Kumar Gala
parent 2af8569dc9
commit 36c50f729b
1 changed files with 0 additions and 2 deletions
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2
arch/ppc/kernel/head_8xx.S
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@ -495,9 +495,7 @@ LoadLargeDTLB:
lwz r11, 4(r0)
lwz r12, 16(r0)
#ifdef CONFIG_8xx_CPU6
lwz r3, 8(r0)
#endif
rfi
/* This is the data TLB error on the MPC8xx. This could be due to