powerpc: Base support for exceptions using HSRR0/1

Pass the register type to the prolog, also provides alternate "HV"
version of hardware interrupt (0x500) and adjust LPES accordingly

We tag those interrupts by setting bit 0x2 in the trap number

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 33 insertions, 32 deletions

diff --git a/arch/powerpc/include/asm/exception-64s.h b/arch/powerpc/include/asm/exception-64s.h
index 337b6fa2f8cd..1d98e05be511 100644
--- a/arch/powerpc/include/asm/exception-64s.h
+++ b/arch/powerpc/include/asm/exception-64s.h
@@ -56,30 +56,37 @@
 #define LOAD_HANDLER(reg, label)					\
 	addi	reg,reg,(label)-_stext;	/* virt addr of handler ... */
 
-#define EXCEPTION_PROLOG_1(area)					\
+/* Exception register prefixes */
+#define EXC_HV	H
+#define EXC_STD
+
+#define __EXCEPTION_PROLOG_1(area, h)					\
 	GET_PACA(r13);							\
 	std	r9,area+EX_R9(r13);	/* save r9 - r12 */		\
 	std	r10,area+EX_R10(r13);					\
 	std	r11,area+EX_R11(r13);					\
 	std	r12,area+EX_R12(r13);					\
-	mfspr	r9,SPRN_SPRG_SCRATCH0;					\
+	mfspr	r9,SPRN_SPRG_##h##SCRATCH0;				\
 	std	r9,area+EX_R13(r13);					\
 	mfcr	r9
+#define EXCEPTION_PROLOG_1(area, h) __EXCEPTION_PROLOG_1(area, h)
 
-#define EXCEPTION_PROLOG_PSERIES_1(label)				\
+#define __EXCEPTION_PROLOG_PSERIES_1(label, h)				\
 	ld	r12,PACAKBASE(r13);	/* get high part of &label */	\
 	ld	r10,PACAKMSR(r13);	/* get MSR value for kernel */	\
-	mfspr	r11,SPRN_SRR0;		/* save SRR0 */			\
+	mfspr	r11,SPRN_##h##SRR0;	/* save SRR0 */			\
 	LOAD_HANDLER(r12,label)						\
-	mtspr	SPRN_SRR0,r12;						\
-	mfspr	r12,SPRN_SRR1;		/* and SRR1 */			\
-	mtspr	SPRN_SRR1,r10;						\
-	rfid;								\
+	mtspr	SPRN_##h##SRR0,r12;					\
+	mfspr	r12,SPRN_##h##SRR1;	/* and SRR1 */			\
+	mtspr	SPRN_##h##SRR1,r10;					\
+	h##rfid;							\
 	b	.	/* prevent speculative execution */
+#define EXCEPTION_PROLOG_PSERIES_1(label, h) \
+	__EXCEPTION_PROLOG_PSERIES_1(label, h)
 
-#define EXCEPTION_PROLOG_PSERIES(area, label)				\
-	EXCEPTION_PROLOG_1(area);					\
-	EXCEPTION_PROLOG_PSERIES_1(label);
+#define EXCEPTION_PROLOG_PSERIES(area, label, h)			\
+	EXCEPTION_PROLOG_1(area, h);					\
+	EXCEPTION_PROLOG_PSERIES_1(label, h);
 
 /*
  * The common exception prolog is used for all except a few exceptions
@@ -150,50 +157,44 @@ label##_pSeries:					\
 	HMT_MEDIUM;					\
 	DO_KVM	n;					\
 	mtspr	SPRN_SPRG_SCRATCH0,r13;		/* save r13 */	\
-	EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common)
+	EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common, EXC_STD)
 
 #define HSTD_EXCEPTION_PSERIES(n, label)		\
 	. = n;						\
 	.globl label##_pSeries;				\
 label##_pSeries:					\
 	HMT_MEDIUM;					\
-	mtspr	SPRN_SPRG_SCRATCH0,r20;	/* save r20 */	\
-	mfspr	r20,SPRN_HSRR0;		/* copy HSRR0 to SRR0 */ \
-	mtspr	SPRN_SRR0,r20;				\
-	mfspr	r20,SPRN_HSRR1;		/* copy HSRR0 to SRR0 */ \
-	mtspr	SPRN_SRR1,r20;				\
-	mfspr	r20,SPRN_SPRG_SCRATCH0;	/* restore r20 */ \
-	mtspr	SPRN_SPRG_SCRATCH0,r13;		/* save r13 */	\
-	EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common)
+	DO_KVM	n;					\
+	mtspr	SPRN_SPRG_HSCRATCH0,r13;/* save r13 */	\
+	EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common, EXC_HV)
 
 
-#define MASKABLE_EXCEPTION_PSERIES(n, label)				\
-	. = n;								\
-	.globl label##_pSeries;						\
-label##_pSeries:							\
+#define __MASKABLE_EXCEPTION_PSERIES(n, label, h)			\
 	HMT_MEDIUM;							\
 	DO_KVM	n;							\
-	mtspr	SPRN_SPRG_SCRATCH0,r13;	/* save r13 */			\
+	mtspr	SPRN_SPRG_##h##SCRATCH0,r13;    /* save r13 */		\
 	GET_PACA(r13);							\
 	std	r9,PACA_EXGEN+EX_R9(r13);	/* save r9, r10 */	\
 	std	r10,PACA_EXGEN+EX_R10(r13);				\
 	lbz	r10,PACASOFTIRQEN(r13);					\
 	mfcr	r9;							\
 	cmpwi	r10,0;							\
-	beq	masked_interrupt;					\
-	mfspr	r10,SPRN_SPRG_SCRATCH0;					\
+	beq	masked_##h##interrupt;					\
+	mfspr	r10,SPRN_SPRG_##h##SCRATCH0;				\
 	std	r10,PACA_EXGEN+EX_R13(r13);				\
 	std	r11,PACA_EXGEN+EX_R11(r13);				\
 	std	r12,PACA_EXGEN+EX_R12(r13);				\
 	ld	r12,PACAKBASE(r13);	/* get high part of &label */	\
 	ld	r10,PACAKMSR(r13);	/* get MSR value for kernel */	\
-	mfspr	r11,SPRN_SRR0;		/* save SRR0 */			\
+	mfspr	r11,SPRN_##h##SRR0;	/* save SRR0 */			\
 	LOAD_HANDLER(r12,label##_common)				\
-	mtspr	SPRN_SRR0,r12;						\
-	mfspr	r12,SPRN_SRR1;		/* and SRR1 */			\
-	mtspr	SPRN_SRR1,r10;						\
-	rfid;								\
+	mtspr	SPRN_##h##SRR0,r12;					\
+	mfspr	r12,SPRN_##h##SRR1;	/* and SRR1 */			\
+	mtspr	SPRN_##h##SRR1,r10;					\
+	h##rfid;							\
 	b	.	/* prevent speculative execution */
+#define MASKABLE_EXCEPTION_PSERIES(n, label, h)				\
+	__MASKABLE_EXCEPTION_PSERIES(n, label, h)
 
 #ifdef CONFIG_PPC_ISERIES
 #define DISABLE_INTS				\