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powerpc/mm: Remove unused register usage in SW TLB miss handling

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Long ago we had some code that actually used the CTR in the SW TLB
miss handlers (603/e300).  Since we don't use it no reason to waste
cycles saving it off and restoring it (we actually didn't restore it
in the fast path case).

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Kumar Gala 2009-03-19 03:55:39 +00:00 committed by Benjamin Herrenschmidt
parent 4ae0ff606e
commit 00fcb14703
1 changed files with 3 additions and 8 deletions
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11
arch/powerpc/kernel/head_32.S
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@ -475,12 +475,11 @@ SystemCall:
. = 0x1000
InstructionTLBMiss:
/*
* r0: stored ctr
* r0: scratch
* r1: linux style pte ( later becomes ppc hardware pte )
* r2: ptr to linux-style pte
* r3: scratch
*/
mfctr r0
/* Get PTE (linux-style) and check access */
mfspr r3,SPRN_IMISS
lis r1,PAGE_OFFSET@h /* check if kernel address */
@ -531,7 +530,6 @@ InstructionAddressInvalid:
addis r1,r1,0x2000
mtspr SPRN_DSISR,r1 /* (shouldn't be needed) */
mtctr r0 /* Restore CTR */
andi. r2,r3,0xFFFF /* Clear upper bits of SRR1 */
or r2,r2,r1
mtspr SPRN_SRR1,r2
@ -552,12 +550,11 @@ InstructionAddressInvalid:
. = 0x1100
DataLoadTLBMiss:
/*
* r0: stored ctr
* r0: scratch
* r1: linux style pte ( later becomes ppc hardware pte )
* r2: ptr to linux-style pte
* r3: scratch
*/
mfctr r0
/* Get PTE (linux-style) and check access */
mfspr r3,SPRN_DMISS
lis r1,PAGE_OFFSET@h /* check if kernel address */
@ -607,7 +604,6 @@ DataAddressInvalid:
rlwinm r1,r3,9,6,6 /* Get load/store bit */
addis r1,r1,0x2000
mtspr SPRN_DSISR,r1
mtctr r0 /* Restore CTR */
andi. r2,r3,0xFFFF /* Clear upper bits of SRR1 */
mtspr SPRN_SRR1,r2
mfspr r1,SPRN_DMISS /* Get failing address */
@ -627,12 +623,11 @@ DataAddressInvalid:
. = 0x1200
DataStoreTLBMiss:
/*
* r0: stored ctr
* r0: scratch
* r1: linux style pte ( later becomes ppc hardware pte )
* r2: ptr to linux-style pte
* r3: scratch
*/
mfctr r0
/* Get PTE (linux-style) and check access */
mfspr r3,SPRN_DMISS
lis r1,PAGE_OFFSET@h /* check if kernel address */