[OpenBIOS] [PATCH] ppc: only clear MSR_SF when clearing high MSR bits
Alexander Graf
agraf at suse.de
Fri Jun 17 01:39:58 CEST 2011
We are pretty aggressive now with how we clear the high MSR bits, clearing
all of them when we find a 64-bit CPU.
As Segher points out, this is not always a good idea though. There might
be bits set that can be crucial for operation. Hence we should only clear
MSR_SF, as that's the bit we're interested in.
Reported-by: Segher Boessenkool <segher at kernel.crashing.org>
Signed-off-by: Alexander Graf <agraf at suse.de>
---
arch/ppc/qemu/start.S | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/arch/ppc/qemu/start.S b/arch/ppc/qemu/start.S
index f06f6d5..aa582e2 100644
--- a/arch/ppc/qemu/start.S
+++ b/arch/ppc/qemu/start.S
@@ -44,7 +44,7 @@
beq 1f; \
\
mfmsr r1 ; /* unset MSR_SF */ \
- clrlwi r1,r1,0 ; \
+ clrldi r1,r1,1 ; \
mtmsrd r1 ; \
1: \
mfsprg0 r1 ; /* exception stack in sprg0 */ \
--
1.6.0.2
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