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From b7072ddc2682868372d060e1e25447e5c1aee007 Mon Sep 17 00:00:00 2001
From: Aric D. Blumer <aric@sdgsystems.com>
Date: Wed, 29 Dec 2010 11:18:29 -0500
Subject: [PATCH 56/65] ARM: pxa: fix page table corruption on resume
Before this patch, the following error would sometimes occur after a
resume on pxa3xx:
/path/to/mm/memory.c:144: bad pmd 8040542e.
The problem was that a temporary page table mapping was being improperly
restored.
The PXA3xx resume code creates a temporary mapping of resume_turn_on_mmu
to avoid a prefetch abort. The pxa3xx_resume_after_mmu code requires
that the r1 register holding the address of this mapping not be
modified, however, resume_turn_on_mmu does modify it. It is mostly
correct in that r1 receives the base table address, but it may also
get other bits in 13:0. This results in pxa3xx_resume_after_mmu
restoring the original mapping to the wrong place, corrupting memory
and leaving the temporary mapping in place.
Signed-off-by: Matt Reimer <mreimer@sdgsystems.com>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
---
arch/arm/mach-pxa/sleep.S | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/arm/mach-pxa/sleep.S b/arch/arm/mach-pxa/sleep.S
index 52c30b0..ae00811 100644
--- a/arch/arm/mach-pxa/sleep.S
+++ b/arch/arm/mach-pxa/sleep.S
@@ -353,8 +353,8 @@ resume_turn_on_mmu:
@ Let us ensure we jump to resume_after_mmu only when the mcr above
@ actually took effect. They call it the "cpwait" operation.
- mrc p15, 0, r1, c2, c0, 0 @ queue a dependency on CP15
- sub pc, r2, r1, lsr #32 @ jump to virtual addr
+ mrc p15, 0, r0, c2, c0, 0 @ queue a dependency on CP15
+ sub pc, r2, r0, lsr #32 @ jump to virtual addr
nop
nop
nop
--
1.6.6.1
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