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| author | Kumar Gala <galak@kernel.crashing.org> | 2009-03-19 03:55:39 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-03-24 13:47:31 +1100 |
| commit | 00fcb14703d8322a9c66cb3f48b5c49ac7d43f0a (patch) | |
| tree | e23dd5504897c5dc75d2dc839ef84dfd56c6ff6b | |
| parent | 4ae0ff606e848fa4957ebf8f97e5db5fdeec27be (diff) | |
| download | talos-obmc-linux-00fcb14703d8322a9c66cb3f48b5c49ac7d43f0a.tar.gz talos-obmc-linux-00fcb14703d8322a9c66cb3f48b5c49ac7d43f0a.zip | |
powerpc/mm: Remove unused register usage in SW TLB miss handling
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>
| -rw-r--r-- | arch/powerpc/kernel/head_32.S | 11 |
1 files changed, 3 insertions, 8 deletions
diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S index d0bad4b93a9c..f37df0c3afbd 100644 --- a/arch/powerpc/kernel/head_32.S +++ b/arch/powerpc/kernel/head_32.S @@ -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 */ |
