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-rw-r--r--arch/powerpc/include/asm/exception-64s.h8
-rw-r--r--arch/powerpc/kernel/exceptions-64s.S5
2 files changed, 13 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/exception-64s.h b/arch/powerpc/include/asm/exception-64s.h
index 66830618cc19..aeaa56cd9b54 100644
--- a/arch/powerpc/include/asm/exception-64s.h
+++ b/arch/powerpc/include/asm/exception-64s.h
@@ -147,6 +147,14 @@ BEGIN_FTR_SECTION_NESTED(943) \
END_FTR_SECTION_NESTED(ftr,ftr,943)
/*
+ * Set an SPR from a register if the CPU has the given feature
+ */
+#define OPT_SET_SPR(ra, spr, ftr) \
+BEGIN_FTR_SECTION_NESTED(943) \
+ mtspr spr,ra; \
+END_FTR_SECTION_NESTED(ftr,ftr,943)
+
+/*
* Save a register to the PACA if the CPU has the given feature
*/
#define OPT_SAVE_REG_TO_PACA(offset, ra, ftr) \
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index 38d507306a11..4c34c3c827ad 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -164,13 +164,18 @@ BEGIN_FTR_SECTION
*/
mfspr r13,SPRN_SRR1
rlwinm. r13,r13,47-31,30,31
+ OPT_GET_SPR(r13, SPRN_CFAR, CPU_FTR_CFAR)
beq 9f
+ mfspr r13,SPRN_SRR1
+ rlwinm. r13,r13,47-31,30,31
/* waking up from powersave (nap) state */
cmpwi cr1,r13,2
/* Total loss of HV state is fatal. let's just stay stuck here */
+ OPT_GET_SPR(r13, SPRN_CFAR, CPU_FTR_CFAR)
bgt cr1,.
9:
+ OPT_SET_SPR(r13, SPRN_CFAR, CPU_FTR_CFAR)
END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
#endif /* CONFIG_PPC_P7_NAP */
EXCEPTION_PROLOG_0(PACA_EXMC)