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powerpc/booke64: Use GSRR registers in Guest Doorbell interrupts

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Guest Doorbell interrupts use guest save and restore registers. Add a new
Guest Doorbell exception type to accommodate GSRR0/1 SPRs usage in exception
prolog and fix the exception handler.

Signed-off-by: Mihai Caraman <mihai.caraman@freescale.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Mihai Caraman
2012-08-06 03:27:04 +00:00
committed by Benjamin Herrenschmidt
parent a131075721
commit 5473eb1c07
3 changed files with 21 additions and 2 deletions
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1
arch/powerpc/include/asm/exception-64e.h
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@@ -37,6 +37,7 @@
* critical data
*/
#define PACA_EXGDBELL PACA_EXGEN
/* We are out of SPRGs so we save some things in the PACA. The normal
* exception frame is smaller than the CRIT or MC one though

1
arch/powerpc/include/asm/reg.h
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@@ -863,6 +863,7 @@
#define SPRN_SPRG_TLB_EXFRAME SPRN_SPRG2
#define SPRN_SPRG_TLB_SCRATCH SPRN_SPRG6
#define SPRN_SPRG_GEN_SCRATCH SPRN_SPRG0
#define SPRN_SPRG_GDBELL_SCRATCH SPRN_SPRG_GEN_SCRATCH
#define SET_PACA(rX) mtspr SPRN_SPRG_PACA,rX
#define GET_PACA(rX) mfspr rX,SPRN_SPRG_PACA