This turns on MMU on execptions via AIL field in the LPCR.
Signed-off-by: Matt Evans <m...@ozlabs.org>
Signed-off-by: Michael Neuling <mi...@neuling.org>
---
arch/powerpc/include/asm/reg.h | 2 ++
arch/powerpc/kernel/cpu_setup_power.S | 2 ++
2 files changed, 4 insertions(+)
diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
index 7b44a6e..886ab8e 100644
--- a/arch/powerpc/include/asm/reg.h
+++ b/arch/powerpc/include/asm/reg.h
@@ -249,6 +249,8 @@
#define LPCR_RMLS 0x1C000000 /* impl dependent rmo limit sel */
#define LPCR_RMLS_SH (63-37)
#define LPCR_ILE 0x02000000 /* !HV irqs set MSR:LE */
+#define LPCR_AIL_0 0x00000000 /* MMU off IRQ location 0x0 */
+#define LPCR_AIL_3 0x01800000 /* MMU on IRQ location 0xc00...4xxx */
#define LPCR_PECE 0x00007000 /* powersave exit cause enable */
#define LPCR_PECE0 0x00004000 /* ext. exceptions can cause exit */
#define LPCR_PECE1 0x00002000 /* decrementer can cause exit */
diff --git a/arch/powerpc/kernel/cpu_setup_power.S
b/arch/powerpc/kernel/cpu_setup_power.S
index 52dd033..57cf140 100644
--- a/arch/powerpc/kernel/cpu_setup_power.S
+++ b/arch/powerpc/kernel/cpu_setup_power.S
@@ -54,6 +54,7 @@ _GLOBAL(__setup_cpu_power8)
li r0,0
mtspr SPRN_LPID,r0
mfspr r3,SPRN_LPCR
+ oris r3, r3, LPCR_AIL_3@h
bl __init_LPCR
bl __init_TLB
mtlr r11
@@ -67,6 +68,7 @@ _GLOBAL(__restore_cpu_power8)
li r0,0
mtspr SPRN_LPID,r0
mfspr r3,SPRN_LPCR
+ oris r3, r3, LPCR_AIL_3@h
bl __init_LPCR
bl __init_TLB
mtlr r11
--
1.7.9.5
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