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

[Haren Myneni <haren@linux.vnet.ibm.com>]

[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>
---
 arch/powerpc/include/asm/exception-64s.h |   29 +++++++++++++++++++++++++++++
 arch/powerpc/include/asm/ppc_asm.h       |   25 +++++++++++++++++++++++++
 arch/powerpc/include/asm/reg.h           |    1 +
 3 files changed, 55 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/include/asm/exception-64s.h b/arch/powerpc/include/asm/exception-64s.h
index bfd3f1f..880ef7d 100644
--- a/arch/powerpc/include/asm/exception-64s.h
+++ b/arch/powerpc/include/asm/exception-64s.h
@@ -62,6 +62,35 @@
 #define EXC_HV	H
 #define EXC_STD
 
+/*
+ * 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)
+
+#define HMT_MEDIUM_NO_PPR						\
+BEGIN_FTR_SECTION_NESTED(942)						\
+	HMT_MEDIUM;							\
+END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,0,942)  /*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) 
+
 #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/ppc_asm.h b/arch/powerpc/include/asm/ppc_asm.h
index 376e36d..52649cc 100644
--- a/arch/powerpc/include/asm/ppc_asm.h
+++ b/arch/powerpc/include/asm/ppc_asm.h
@@ -389,6 +389,31 @@ END_FTR_SECTION_IFCLR(CPU_FTR_601)
 	FTR_SECTION_ELSE_NESTED(848);	\
 	mtocrf (FXM), RS;		\
 	ALT_FTR_SECTION_END_NESTED_IFCLR(CPU_FTR_NOEXECUTE, 848)
+
+/*
+ * PPR restore macros used in entry_64.S
+ * Used for P7 or later processors
+ */
+#define HMT_MEDIUM_LOW_HAS_PPR						\
+BEGIN_FTR_SECTION_NESTED(944)						\
+	HMT_MEDIUM_LOW;							\
+END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,944)
+
+#define SET_DEFAULT_THREAD_PPR(ra, rb)					\
+BEGIN_FTR_SECTION_NESTED(945)						\
+	lis	ra,0xc;		/* default ppr=3 */			\
+	ld	rb,PACACURRENT(r13);					\
+	sldi	ra,ra,32;	/* 11- 13 bits are used for ppr */	\
+	std	ra,TASKTHREADPPR(rb);					\
+END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,945)
+
+#define RESTORE_PPR(ra, rb)						\
+BEGIN_FTR_SECTION_NESTED(946)						\
+	ld	ra,PACACURRENT(r13);					\
+	ld	rb,TASKTHREADPPR(ra);					\
+	mtspr	SPRN_PPR,rb;	/* Restore PPR */			\
+END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,946)
+
 #endif
 
 /*
diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
index d24c141..1723be3 100644
--- a/arch/powerpc/include/asm/reg.h
+++ b/arch/powerpc/include/asm/reg.h
@@ -287,6 +287,7 @@
 #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 */
-- 
1.7.1