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authorNicolas Pitre <nico@cam.org>2006-02-01 19:26:01 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-02-01 19:26:01 +0000
commit18afea04f1dfc5d52fd2579cd17adc3956acd4ad (patch)
tree45b56a2a6c16662bfd135637295798a9fba3ac69
parent8a052e0bc25ff52f17b3dff150846ca9eb969162 (diff)
downloadop-kernel-dev-18afea04f1dfc5d52fd2579cd17adc3956acd4ad.zip
op-kernel-dev-18afea04f1dfc5d52fd2579cd17adc3956acd4ad.tar.gz
[ARM] 3294/1: don't invalidate individual BTB entries on ARMv6
Patch from Nicolas Pitre Doing so adds a much larger cost to the loop than the cost implied by simply invalidating the whole BTB at once. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
-rw-r--r--arch/arm/mm/cache-v6.S18
1 files changed, 6 insertions, 12 deletions
diff --git a/arch/arm/mm/cache-v6.S b/arch/arm/mm/cache-v6.S
index 72966d9..d921c10 100644
--- a/arch/arm/mm/cache-v6.S
+++ b/arch/arm/mm/cache-v6.S
@@ -92,22 +92,16 @@ ENTRY(v6_coherent_kern_range)
* - the Icache does not read data from the write buffer
*/
ENTRY(v6_coherent_user_range)
- bic r0, r0, #CACHE_LINE_SIZE - 1
-1:
+
#ifdef HARVARD_CACHE
- mcr p15, 0, r0, c7, c10, 1 @ clean D line
+ bic r0, r0, #CACHE_LINE_SIZE - 1
+1: mcr p15, 0, r0, c7, c10, 1 @ clean D line
mcr p15, 0, r0, c7, c5, 1 @ invalidate I line
-#endif
- mcr p15, 0, r0, c7, c5, 7 @ invalidate BTB entry
- add r0, r0, #BTB_FLUSH_SIZE
- mcr p15, 0, r0, c7, c5, 7 @ invalidate BTB entry
- add r0, r0, #BTB_FLUSH_SIZE
- mcr p15, 0, r0, c7, c5, 7 @ invalidate BTB entry
- add r0, r0, #BTB_FLUSH_SIZE
- mcr p15, 0, r0, c7, c5, 7 @ invalidate BTB entry
- add r0, r0, #BTB_FLUSH_SIZE
+ add r0, r0, #CACHE_LINE_SIZE
cmp r0, r1
blo 1b
+#endif
+ mcr p15, 0, r0, c7, c5, 6 @ invalidate BTB
#ifdef HARVARD_CACHE
mov r0, #0
mcr p15, 0, r0, c7, c10, 4 @ drain write buffer
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