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| author | Tony Thompson <Anthony.Thompson@arm.com> | 2009-11-04 12:16:38 +0000 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2009-11-04 12:19:22 +0000 |
| commit | 1b3a02eb452354fa9b36a7f33dc4c8307bbc40aa (patch) | |
| tree | 232eab4b30cda81c310864e0dc18b57c431f33dd /arch/arm | |
| parent | b419148e567728f6af0c3b01965c1cc141e3e13a (diff) | |
| download | linux-1b3a02eb452354fa9b36a7f33dc4c8307bbc40aa.tar.gz linux-1b3a02eb452354fa9b36a7f33dc4c8307bbc40aa.tar.bz2 linux-1b3a02eb452354fa9b36a7f33dc4c8307bbc40aa.zip | |
ARMv7: Check whether the SMP/nAMP mode was already enabled
If running in non-secure mode, enabling this register will fault.
Signed-off-by: Tony Thompson <Anthony.Thompson@arm.com>
Acked-by: Srinidhi Kasagar <srinidhikasagar@gmail.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/mm/proc-v7.S | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S index eeeed01ee44a..3a285218fd15 100644 --- a/arch/arm/mm/proc-v7.S +++ b/arch/arm/mm/proc-v7.S @@ -186,9 +186,10 @@ cpu_v7_name: */ __v7_setup: #ifdef CONFIG_SMP - mrc p15, 0, r0, c1, c0, 1 @ Enable SMP/nAMP mode and - orr r0, r0, #(1 << 6) | (1 << 0) @ TLB ops broadcasting - mcr p15, 0, r0, c1, c0, 1 + mrc p15, 0, r0, c1, c0, 1 + tst r0, #(1 << 6) @ SMP/nAMP mode enabled? + orreq r0, r0, #(1 << 6) | (1 << 0) @ Enable SMP/nAMP mode and + mcreq p15, 0, r0, c1, c0, 1 @ TLB ops broadcasting #endif adr r12, __v7_setup_stack @ the local stack stmia r12, {r0-r5, r7, r9, r11, lr} |