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microblaze: Save and restore msr in hw exception

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I thought that this part of code could be removed because just
save and restore MSR but any code can't change it. But seems to
that any part of code works with this information.

This patch solved problem with allocation.

Signed-off-by: Michal Simek <monstr@monstr.eu>
This commit is contained in:
Michal Simek 2009-09-17 17:37:33 +02:00
parent afc26cb39e
commit ac854ff1fc
1 changed files with 6 additions and 2 deletions
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8
arch/microblaze/kernel/hw_exception_handler.S
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@ -84,9 +84,10 @@
#define NUM_TO_REG(num) r ## num
#ifdef CONFIG_MMU
/* FIXME you can't change first load of MSR because there is
* hardcoded jump bri 4 */
#define RESTORE_STATE \
lwi r5, r1, 0; \
mts rmsr, r5; \
nop; \
lwi r3, r1, PT_R3; \
lwi r4, r1, PT_R4; \
lwi r5, r1, PT_R5; \
@ -309,6 +310,9 @@ _hw_exception_handler:
lwi r31, r0, TOPHYS(PER_CPU(CURRENT_SAVE)) /* get saved current */
#endif
mfs r5, rmsr;
nop
swi r5, r1, 0;
mfs r3, resr
nop
mfs r4, rear;