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Check whether the TLB operations need broadcasting on SMP systems

Telusuri Sumber 
ARMv7 SMP hardware can handle the TLB maintenance operations
broadcasting in hardware so that the software can avoid the costly IPIs.
This patch adds the necessary checks (the MMFR3 CPUID register) to avoid
the broadcasting if already supported by the hardware.

(this patch is based on the work done by Tony Thompson @ ARM)

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Catalin Marinas
2009-05-30 14:00:14 +01:00
orang tua da055eb52e
melakukan faa7bc51c1
5 mengubah file dengan 105 tambahan dan 36 penghapusan
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17
arch/arm/mm/tlb-v7.S
Melihat File

@@ -42,9 +42,11 @@ ENTRY(v7wbi_flush_user_tlb_range)
mov r1, r1, lsl #PAGE_SHIFT
vma_vm_flags r2, r2 @ get vma->vm_flags
1:
mcr p15, 0, r0, c8, c6, 1 @ TLB invalidate D MVA (was 1)
tst r2, #VM_EXEC @ Executable area ?
mcrne p15, 0, r0, c8, c5, 1 @ TLB invalidate I MVA (was 1)
#ifdef CONFIG_SMP
mcr p15, 0, r0, c8, c3, 1 @ TLB invalidate U MVA (shareable)
#else
mcr p15, 0, r0, c8, c7, 1 @ TLB invalidate U MVA
#endif
add r0, r0, #PAGE_SZ
cmp r0, r1
blo 1b
@@ -69,8 +71,11 @@ ENTRY(v7wbi_flush_kern_tlb_range)
mov r0, r0, lsl #PAGE_SHIFT
mov r1, r1, lsl #PAGE_SHIFT
1:
mcr p15, 0, r0, c8, c6, 1 @ TLB invalidate D MVA
mcr p15, 0, r0, c8, c5, 1 @ TLB invalidate I MVA
#ifdef CONFIG_SMP
mcr p15, 0, r0, c8, c3, 1 @ TLB invalidate U MVA (shareable)
#else
mcr p15, 0, r0, c8, c7, 1 @ TLB invalidate U MVA
#endif
add r0, r0, #PAGE_SZ
cmp r0, r1
blo 1b
@@ -87,5 +92,5 @@ ENDPROC(v7wbi_flush_kern_tlb_range)
ENTRY(v7wbi_tlb_fns)
.long v7wbi_flush_user_tlb_range
.long v7wbi_flush_kern_tlb_range
.long v6wbi_tlb_flags
.long v7wbi_tlb_flags
.size v7wbi_tlb_fns, . - v7wbi_tlb_fns