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ARM1136: Fix cache_flush() error and correct cpu_init_crit() comments

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The ARM1136 cache_flush() function uses the "mcr p15, 0, rn, c7, c7, 0"
instruction which means "Invalidate Both Caches" when in fact the intent
is to clean and invalidate all caches.  So add an "mcr p15, 0, %0, c7,
c10, 0" instruction to "Clean Entire Data Cache" prior to the "Invalidate
Both Caches" instruction to insure that memory is consistent with any
dirty cache lines.

Also fix a couple of "flush v*" comments in ARM1136 cpu_init_crit() so
that they correctly describe the actual ARM1136 CP15 C7 Cache Operations
used.

Signed-off-by: George G. Davis <gdavis@mvista.com>
This commit is contained in:
George G. Davis 2010-05-11 10:15:36 -04:00 committed by Tom
parent 39c209546a
commit 409a07c9d7
2 changed files with 3 additions and 2 deletions
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1
arch/arm/cpu/arm1136/cpu.c
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@ -71,6 +71,7 @@ static void cache_flush(void)
{
unsigned long i = 0;
asm ("mcr p15, 0, %0, c7, c10, 0": :"r" (i)); /* clean entire data cache */
asm ("mcr p15, 0, %0, c7, c7, 0": :"r" (i)); /* invalidate both caches and flush btb */
asm ("mcr p15, 0, %0, c7, c10, 4": :"r" (i)); /* mem barrier to sync things */
}

4
arch/arm/cpu/arm1136/start.S
View File

@ -226,8 +226,8 @@ cpu_init_crit:
* flush v4 I/D caches
*/
mov r0, #0
mcr p15, 0, r0, c7, c7, 0 /* flush v3/v4 cache */
mcr p15, 0, r0, c8, c7, 0 /* flush v4 TLB */
mcr p15, 0, r0, c7, c7, 0 /* Invalidate I+D+BTB caches */
mcr p15, 0, r0, c8, c7, 0 /* Invalidate Unified TLB */
/*
* disable MMU stuff and caches