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[ARM] Always mark ARMv6 PTWs outer cacheable

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Other platforms other than SMP may have an outer cache.  For these, we
also need to mark the page table walks outer cacheable.  Since marking
the walks always outer cacheable apparantly has no side effects, we
might as well always mark them so.

However, we continue to only mark PTWs shared if we have SMP enabled.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2007-02-08 20:46:20 +00:00 committed by Russell King
parent 3e1a80f11f
commit f2131d348f
1 changed files with 8 additions and 6 deletions
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14
arch/arm/mm/proc-v6.S
View file

@ -30,6 +30,12 @@
#define TTB_RGN_WT (2 << 3)
#define TTB_RGN_WB (3 << 3)
#ifndef CONFIG_SMP
#define TTB_FLAGS TTB_RGN_WBWA
#else
#define TTB_FLAGS TTB_RGN_WBWA|TTB_S
#endif
ENTRY(cpu_v6_proc_init)
mov pc, lr
@ -92,9 +98,7 @@ ENTRY(cpu_v6_switch_mm)
#ifdef CONFIG_MMU
mov r2, #0
ldr r1, [r1, #MM_CONTEXT_ID] @ get mm->context.id
#ifdef CONFIG_SMP
orr r0, r0, #TTB_RGN_WBWA|TTB_S @ mark PTWs shared, outer cacheable
#endif
orr r0, r0, #TTB_FLAGS
mcr p15, 0, r2, c7, c5, 6 @ flush BTAC/BTB
mcr p15, 0, r2, c7, c10, 4 @ drain write buffer
mcr p15, 0, r0, c2, c0, 0 @ set TTB 0
@ -204,9 +208,7 @@ __v6_setup:
#ifdef CONFIG_MMU
mcr p15, 0, r0, c8, c7, 0 @ invalidate I + D TLBs
mcr p15, 0, r0, c2, c0, 2 @ TTB control register
#ifdef CONFIG_SMP
orr r4, r4, #TTB_RGN_WBWA|TTB_S @ mark PTWs shared, outer cacheable
#endif
orr r4, r4, #TTB_FLAGS
mcr p15, 0, r4, c2, c0, 1 @ load TTB1
#endif /* CONFIG_MMU */
adr r5, v6_crval