diff options
author | Aric D. Blumer <aric@sdgsystems.com> | 2010-12-29 11:18:29 -0500 |
---|---|---|
committer | Eric Miao <eric.y.miao@gmail.com> | 2011-01-03 10:18:59 -0500 |
commit | 24c78557741395e038e83f25367cf2bfd7f582b8 (patch) | |
tree | f66c6e716e935775308bf37d5717ece4470dc551 /arch | |
parent | 823a2df258627b80df2e75056b850424a8eb5fed (diff) |
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>
Diffstat (limited to 'arch')
-rw-r--r-- | 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 52c30b01a671..ae008110db4e 100644 --- a/arch/arm/mach-pxa/sleep.S +++ b/arch/arm/mach-pxa/sleep.S | |||
@@ -353,8 +353,8 @@ resume_turn_on_mmu: | |||
353 | 353 | ||
354 | @ Let us ensure we jump to resume_after_mmu only when the mcr above | 354 | @ Let us ensure we jump to resume_after_mmu only when the mcr above |
355 | @ actually took effect. They call it the "cpwait" operation. | 355 | @ actually took effect. They call it the "cpwait" operation. |
356 | mrc p15, 0, r1, c2, c0, 0 @ queue a dependency on CP15 | 356 | mrc p15, 0, r0, c2, c0, 0 @ queue a dependency on CP15 |
357 | sub pc, r2, r1, lsr #32 @ jump to virtual addr | 357 | sub pc, r2, r0, lsr #32 @ jump to virtual addr |
358 | nop | 358 | nop |
359 | nop | 359 | nop |
360 | nop | 360 | nop |