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powerpc: Setup relocation on exceptions for bare metal systems

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This turns on MMU on execptions via AIL field in the LPCR.

Signed-off-by: Matt Evans <matt@ozlabs.org>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Neuling 2012-11-02 16:41:58 +11:00 committed by Benjamin Herrenschmidt
parent f7c32c24f5
commit b0302722ee
2 changed files with 4 additions and 0 deletions
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2
arch/powerpc/include/asm/reg.h
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@ -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 exception offset 0x0 */
#define LPCR_AIL_3 0x01800000 /* MMU on exception offset 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 */

2
arch/powerpc/kernel/cpu_setup_power.S
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@ -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