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ARMv7: Check whether the SMP/nAMP mode was already enabled

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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>
This commit is contained in:
Tony Thompson 2009-11-04 12:16:38 +00:00 committed by Catalin Marinas
parent b419148e56
commit 1b3a02eb45
1 changed files with 4 additions and 3 deletions
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7
arch/arm/mm/proc-v7.S
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@ -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}