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Author: Alexander Graf <alex@csgraf.de>

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PPC64: Switch to 32-bit mode in interrupts

All the code in OpenBIOS runs in 32 bits, which is fine. Now, when
an interrupt arrives, the 970 CPU automatically sets the MSR_SF bit,
making us run in 64 bit mode.

That breaks address calculation, because 'lis' and 'ba' get sign
extended.

In order to circumvent that mess, let's just go back to 32 bit mode
whenever we get an interrupt.

Signed-off-by: Alexander Graf <alex@csgraf.de>
Signed-off-by: Laurent Vivier <Laurent@vivier.eu>



git-svn-id: svn://coreboot.org/openbios/openbios-devel@464 f158a5a8-5612-0410-a976-696ce0be7e32
This commit is contained in:
Alexander Graf
2009-03-08 00:54:06 +00:00
committed by Laurent Vivier
parent 2da21531b5
commit 5973871ed2
1 changed files with 3 additions and 0 deletions
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3
arch/ppc/qemu/start.S
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@@ -34,6 +34,9 @@
#define EXCEPTION_PREAMBLE_TEMPLATE \
mtsprg1 r1 ; /* scratch */ \
mfmsr r1 ; /* unset MSR_SF */ \
clrlwi r1,r1,0 ; \
mtmsr r1 ; \
mfsprg0 r1 ; /* exception stack in sprg0 */ \
.ifc ULONG_SIZE, 8 ; \
addi r1,r1,-(40 * ULONG_SIZE) ; /* push exception frame */ \