[commit] r1044 - trunk/openbios-devel/arch/ppc/qemu

[repository service]

Author: agraf
Date: Fri Jun 17 02:55:04 2011
New Revision: 1044
URL: http://tracker.coreboot.org/trac/openbios/changeset/1044

Log:
ppc: only clear MSR_SF when clearing high MSR bits

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 
Signed-off-by: Alexander Graf

Modified:
   trunk/openbios-devel/arch/ppc/qemu/start.S

Modified: trunk/openbios-devel/arch/ppc/qemu/start.S
==============================================================================
--- trunk/openbios-devel/arch/ppc/qemu/start.S	Fri Jun 17 02:55:02 2011	(r1043)
+++ trunk/openbios-devel/arch/ppc/qemu/start.S	Fri Jun 17 02:55:04 2011	(r1044)
@@ -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 */ \