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| author | Will Deacon <will.deacon@arm.com> | 2011-02-18 15:36:35 (GMT) |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-02-19 11:24:12 (GMT) |
| commit | 9a27c27ce49df72b1b0062e2ad192a804e1b069b (patch) | |
| tree | 5b9a40505271f8d0fa2c685e75300fd661a74948 /arch/arm/mm/proc-v7.S | |
| parent | 71efb063f4a145ae420be054f5a91dcf7c19b375 (diff) | |
| download | linux-9a27c27ce49df72b1b0062e2ad192a804e1b069b.tar.xz | |
ARM: 6743/1: errata: interrupted ICALLUIS may prevent completion of broadcasted operation
On versions of the Cortex-A9 prior to r3p0, an interrupted ICIALLUIS
operation may prevent the completion of a following broadcasted
operation if the second operation is received by a CPU before the
ICIALLUIS has completed, potentially leading to corrupted entries in
the cache or TLB.
This workaround sets a bit in the diagnostic register of the Cortex-A9,
causing CP15 maintenance operations to be uninterruptible.
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm/proc-v7.S')
| -rw-r--r-- | arch/arm/mm/proc-v7.S | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S index 0c1172b..8e33562 100644 --- a/arch/arm/mm/proc-v7.S +++ b/arch/arm/mm/proc-v7.S @@ -264,6 +264,12 @@ __v7_setup: orreq r10, r10, #1 << 6 @ set bit #6 mcreq p15, 0, r10, c15, c0, 1 @ write diagnostic register #endif +#ifdef CONFIG_ARM_ERRATA_751472 + cmp r6, #0x30 @ present prior to r3p0 + mrclt p15, 0, r10, c15, c0, 1 @ read diagnostic register + orrlt r10, r10, #1 << 11 @ set bit #11 + mcrlt p15, 0, r10, c15, c0, 1 @ write diagnostic register +#endif 3: mov r10, #0 #ifdef HARVARD_CACHE |