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powerpc: Macros for saving/restore PPR

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[PATCH 5/6] powerpc: Macros for saving/restore PPR

Several macros are defined for saving and restore user defined PPR value.

Signed-off-by: Haren Myneni <haren@us.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Haren Myneni
2012-12-06 21:50:32 +00:00
committed by Benjamin Herrenschmidt
parent 9277924559
commit 13e7a8e846
3 changed files with 63 additions and 0 deletions
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37
arch/powerpc/include/asm/exception-64s.h
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@@ -108,6 +108,43 @@
#define RESTORE_LR(reg, area)
#endif
/*
* PPR save/restore macros used in exceptions_64s.S
* Used for P7 or later processors
*/
#define SAVE_PPR(area, ra, rb) \
BEGIN_FTR_SECTION_NESTED(940) \
ld ra,PACACURRENT(r13); \
ld rb,area+EX_PPR(r13); /* Read PPR from paca */ \
std rb,TASKTHREADPPR(ra); \
END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,940)
#define RESTORE_PPR_PACA(area, ra) \
BEGIN_FTR_SECTION_NESTED(941) \
ld ra,area+EX_PPR(r13); \
mtspr SPRN_PPR,ra; \
END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,941)
/*
* Increase the priority on systems where PPR save/restore is not
* implemented/ supported.
*/
#define HMT_MEDIUM_PPR_DISCARD \
BEGIN_FTR_SECTION_NESTED(942) \
HMT_MEDIUM; \
END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,0,942) /*non P7*/
/*
* Save PPR in paca whenever some register is available to use.
* Then increase the priority.
*/
#define HMT_MEDIUM_PPR_SAVE(area, ra) \
BEGIN_FTR_SECTION_NESTED(943) \
mfspr ra,SPRN_PPR; \
std ra,area+EX_PPR(r13); \
HMT_MEDIUM; \
END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,943)
#define __EXCEPTION_PROLOG_1(area, extra, vec) \
GET_PACA(r13); \
std r9,area+EX_R9(r13); /* save r9 - r12 */ \