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arm: mm: qsd8x50: Fix incorrect permission faults

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Handle incorrectly reported permission faults for qsd8650.  On
permission faults, retry MVA to PA conversion.  If retry detects
translation fault.  Report as translation fault.

Cc: Jamie Lokier <jamie@shareable.org>
Signed-off-by: Dave Estes <cestes@quicinc.com>
This commit is contained in:
Dave Estes 2009-08-11 17:58:49 -04:00 committed by Daniel Walker
parent ee3c454b8d
commit e220ba6022
2 changed files with 23 additions and 0 deletions
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2
arch/arm/mm/Kconfig
View File

@ -572,6 +572,8 @@ config CPU_TLB_V6
config CPU_TLB_V7
bool
config VERIFY_PERMISSION_FAULT
bool
endif
config CPU_HAS_ASID

21
arch/arm/mm/abort-ev7.S
View File

@ -29,5 +29,26 @@ ENTRY(v7_early_abort)
* V6 code adjusts the returned DFSR.
* New designs should not need to patch up faults.
*/
#if defined(CONFIG_VERIFY_PERMISSION_FAULT)
/*
* Detect erroneous permission failures and fix
*/
ldr r3, =0x40d @ On permission fault
and r3, r1, r3
cmp r3, #0x0d
movne pc, lr
mcr p15, 0, r0, c7, c8, 0 @ Retranslate FAR
isb
mrc p15, 0, r2, c7, c4, 0 @ Read the PAR
and r3, r2, #0x7b @ On translation fault
cmp r3, #0x0b
movne pc, lr
bic r1, r1, #0xf @ Fix up FSR FS[5:0]
and r2, r2, #0x7e
orr r1, r1, r2, LSR #1
#endif
mov pc, lr
ENDPROC(v7_early_abort)