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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-07-14 20:52:54 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-08-20 10:12:27 +1000
commitee43eb788b3a06425fffb912677e2e1c8b00dd3b (patch)
tree7233cb47647837ab00af81270b3a16555d88a1f1 /arch/powerpc/include/asm/exception-64s.h
parent8aa34ab8b2dc96ca6c4feecfb87ed13f0d40ef98 (diff)
downloadlinaro-lsk-ee43eb788b3a06425fffb912677e2e1c8b00dd3b.tar.gz
powerpc: Use names rather than numbers for SPRGs (v2)
The kernel uses SPRG registers for various purposes, typically in low level assembly code as scratch registers or to hold per-cpu global infos such as the PACA or the current thread_info pointer. We want to be able to easily shuffle the usage of those registers as some implementations have specific constraints realted to some of them, for example, some have userspace readable aliases, etc.. and the current choice isn't always the best. This patch should not change any code generation, and replaces the usage of SPRN_SPRGn everywhere in the kernel with a named replacement and adds documentation next to the definition of the names as to what those are used for on each processor family. The only parts that still use the original numbers are bits of KVM or suspend/resume code that just blindly needs to save/restore all the SPRGs. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include/asm/exception-64s.h')
-rw-r--r--arch/powerpc/include/asm/exception-64s.h18
1 files changed, 9 insertions, 9 deletions
diff --git a/arch/powerpc/include/asm/exception-64s.h b/arch/powerpc/include/asm/exception-64s.h
index d3d4534e3c7..773e380b5fe 100644
--- a/arch/powerpc/include/asm/exception-64s.h
+++ b/arch/powerpc/include/asm/exception-64s.h
@@ -57,12 +57,12 @@
addi reg,reg,(label)-_stext; /* virt addr of handler ... */
#define EXCEPTION_PROLOG_1(area) \
- mfspr r13,SPRN_SPRG3; /* get paca address into r13 */ \
+ mfspr r13,SPRN_SPRG_PACA; /* get paca address into 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_SPRG1; \
+ mfspr r9,SPRN_SPRG_SCRATCH0; \
std r9,area+EX_R13(r13); \
mfcr r9
@@ -144,7 +144,7 @@
.globl label##_pSeries; \
label##_pSeries: \
HMT_MEDIUM; \
- mtspr SPRN_SPRG1,r13; /* save r13 */ \
+ mtspr SPRN_SPRG_SCRATCH0,r13; /* save r13 */ \
EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common)
#define HSTD_EXCEPTION_PSERIES(n, label) \
@@ -152,13 +152,13 @@ label##_pSeries: \
.globl label##_pSeries; \
label##_pSeries: \
HMT_MEDIUM; \
- mtspr SPRN_SPRG1,r20; /* save r20 */ \
+ 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_SPRG1; /* restore r20 */ \
- mtspr SPRN_SPRG1,r13; /* save r13 */ \
+ mfspr r20,SPRN_SPRG_SCRATCH0; /* restore r20 */ \
+ mtspr SPRN_SPRG_SCRATCH0,r13; /* save r13 */ \
EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common)
@@ -167,15 +167,15 @@ label##_pSeries: \
.globl label##_pSeries; \
label##_pSeries: \
HMT_MEDIUM; \
- mtspr SPRN_SPRG1,r13; /* save r13 */ \
- mfspr r13,SPRN_SPRG3; /* get paca address into r13 */ \
+ mtspr SPRN_SPRG_SCRATCH0,r13; /* save r13 */ \
+ mfspr r13,SPRN_SPRG_PACA; /* get paca address into 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_SPRG1; \
+ mfspr r10,SPRN_SPRG_SCRATCH0; \
std r10,PACA_EXGEN+EX_R13(r13); \
std r11,PACA_EXGEN+EX_R11(r13); \
std r12,PACA_EXGEN+EX_R12(r13); \