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

[Haren Myneni]

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

Signed-off-by: Haren Myneni <haren at us.ibm.com>
---
 arch/powerpc/include/asm/exception-64s.h |   35 ++++++++++++++++++++++++++++++
 arch/powerpc/include/asm/reg.h           |    1 +
 2 files changed, 36 insertions(+)

diff --git a/arch/powerpc/include/asm/exception-64s.h b/arch/powerpc/include/asm/exception-64s.h
index bfd3f1f..618fd18 100644
--- a/arch/powerpc/include/asm/exception-64s.h
+++ b/arch/powerpc/include/asm/exception-64s.h
@@ -62,6 +62,41 @@
 #define EXC_HV	H
 #define EXC_STD
 
+/*
+ * PPR save/restore macros - Used on P7 or later processors
+ */
+#define SAVE_PPR(area, ra, rb)						\
+BEGIN_FTR_SECTION_NESTED(940)						\
+	ld	ra,area+EX_PPR(r13);	/* Read PPR from paca */	\
+	clrrdi	rb,r1,THREAD_SHIFT;	/* thread_info struct */	\
+	std	ra,TI_PPR(rb);		/* Save PPR in thread_info */	\
+END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,940)
+
+#define RESTORE_PPR(ra,rb)						\
+BEGIN_FTR_SECTION_NESTED(941)						\
+	clrrdi	ra,r1,THREAD_SHIFT;					\
+	ld	rb,TI_PPR(ra);		/* Read PPR from thread_info */	\
+	mtspr	SPRN_PPR,rb;		/* Restore PPR */		\
+END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,941)
+
+#define RESTORE_PPR_PACA(area,ra)					\
+BEGIN_FTR_SECTION_NESTED(942)						\
+	ld	ra,area+EX_PPR(r13);					\
+	mtspr	SPRN_PPR,ra;						\
+END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,942)
+
+#define HMT_MEDIUM_NO_PPR						\
+BEGIN_FTR_SECTION_NESTED(944)						\
+	HMT_MEDIUM;							\
+END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,0,944)  /*non P7*/		
+
+#define HMT_MEDIUM_HAS_PPR(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) /* P7 */
+
 #define __EXCEPTION_PROLOG_1(area, extra, vec)				\
 	GET_PACA(r13);							\
 	std	r9,area+EX_R9(r13);	/* save r9 - r12 */		\
diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
index 6386086..dff2f89 100644
--- a/arch/powerpc/include/asm/reg.h
+++ b/arch/powerpc/include/asm/reg.h
@@ -284,6 +284,7 @@
 #define SPRN_DBAT6U	0x23C	/* Data BAT 6 Upper Register */
 #define SPRN_DBAT7L	0x23F	/* Data BAT 7 Lower Register */
 #define SPRN_DBAT7U	0x23E	/* Data BAT 7 Upper Register */
+#define SPRN_PPR	0x380	/* SMT Thread status Register */
 
 #define SPRN_DEC	0x016		/* Decrement Register */
 #define SPRN_DER	0x095		/* Debug Enable Regsiter */
-- 
1.7.10.4