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-rw-r--r--arch/ppc64/kernel/head.S10
-rw-r--r--include/asm-ppc64/processor.h9
2 files changed, 19 insertions, 0 deletions
diff --git a/arch/ppc64/kernel/head.S b/arch/ppc64/kernel/head.S
index 675c2708588..93ebcac0d5a 100644
--- a/arch/ppc64/kernel/head.S
+++ b/arch/ppc64/kernel/head.S
@@ -308,6 +308,7 @@ exception_marker:
label##_pSeries: \
HMT_MEDIUM; \
mtspr SPRG1,r13; /* save r13 */ \
+ RUNLATCH_ON(r13); \
EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common)
#define STD_EXCEPTION_ISERIES(n, label, area) \
@@ -315,6 +316,7 @@ label##_pSeries: \
label##_iSeries: \
HMT_MEDIUM; \
mtspr SPRG1,r13; /* save r13 */ \
+ RUNLATCH_ON(r13); \
EXCEPTION_PROLOG_ISERIES_1(area); \
EXCEPTION_PROLOG_ISERIES_2; \
b label##_common
@@ -324,6 +326,7 @@ label##_iSeries: \
label##_iSeries: \
HMT_MEDIUM; \
mtspr SPRG1,r13; /* save r13 */ \
+ RUNLATCH_ON(r13); \
EXCEPTION_PROLOG_ISERIES_1(PACA_EXGEN); \
lbz r10,PACAPROCENABLED(r13); \
cmpwi 0,r10,0; \
@@ -393,6 +396,7 @@ __start_interrupts:
_machine_check_pSeries:
HMT_MEDIUM
mtspr SPRG1,r13 /* save r13 */
+ RUNLATCH_ON(r13)
EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common)
. = 0x300
@@ -419,6 +423,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_SLB)
data_access_slb_pSeries:
HMT_MEDIUM
mtspr SPRG1,r13
+ RUNLATCH_ON(r13)
mfspr r13,SPRG3 /* get paca address into r13 */
std r9,PACA_EXSLB+EX_R9(r13) /* save r9 - r12 */
std r10,PACA_EXSLB+EX_R10(r13)
@@ -439,6 +444,7 @@ data_access_slb_pSeries:
instruction_access_slb_pSeries:
HMT_MEDIUM
mtspr SPRG1,r13
+ RUNLATCH_ON(r13)
mfspr r13,SPRG3 /* get paca address into r13 */
std r9,PACA_EXSLB+EX_R9(r13) /* save r9 - r12 */
std r10,PACA_EXSLB+EX_R10(r13)
@@ -464,6 +470,7 @@ instruction_access_slb_pSeries:
.globl system_call_pSeries
system_call_pSeries:
HMT_MEDIUM
+ RUNLATCH_ON(r9)
mr r9,r13
mfmsr r10
mfspr r13,SPRG3
@@ -707,11 +714,13 @@ fwnmi_data_area:
system_reset_fwnmi:
HMT_MEDIUM
mtspr SPRG1,r13 /* save r13 */
+ RUNLATCH_ON(r13)
EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common)
.globl machine_check_fwnmi
machine_check_fwnmi:
HMT_MEDIUM
mtspr SPRG1,r13 /* save r13 */
+ RUNLATCH_ON(r13)
EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common)
/*
@@ -848,6 +857,7 @@ unrecov_fer:
.align 7
.globl data_access_common
data_access_common:
+ RUNLATCH_ON(r10) /* It wont fit in the 0x300 handler */
mfspr r10,DAR
std r10,PACA_EXGEN+EX_DAR(r13)
mfspr r10,DSISR
diff --git a/include/asm-ppc64/processor.h b/include/asm-ppc64/processor.h
index 06aa07c2c71..352306cfb57 100644
--- a/include/asm-ppc64/processor.h
+++ b/include/asm-ppc64/processor.h
@@ -524,6 +524,15 @@ static inline void ppc64_runlatch_off(void)
#endif /* __ASSEMBLY__ */
+#ifdef __KERNEL__
+#define RUNLATCH_ON(REG) \
+BEGIN_FTR_SECTION \
+ mfspr (REG),SPRN_CTRLF; \
+ ori (REG),(REG),CTRL_RUNLATCH; \
+ mtspr SPRN_CTRLT,(REG); \
+END_FTR_SECTION_IFSET(CPU_FTR_CTRL)
+#endif
+
/*
* Number of entries in the SLB. If this ever changes we should handle
* it with a use a cpu feature fixup.