We can now use SPRN_M_TW in the DAR Fixup code, freeing
SPRN_SPRG_SCRATCH2
Then SPRN_SPRG_SCRATCH2 may be used for something else in the future.
Signed-off-by: Christophe Leroy <christophe.le...@c-s.fr>
---
arch/powerpc/kernel/head_8xx.S | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index c98a4ebb5a4d..8e96b526f109 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -624,7 +624,7 @@ InstructionBreakpoint:
/* define if you don't want to use self modifying code */
#define NO_SELF_MODIFYING_CODE
FixupDAR:/* Entry point for dcbx workaround. */
- mtspr SPRN_SPRG_SCRATCH2, r10
+ mtspr SPRN_M_TW, r10
/* fetch instruction from memory. */
mfspr r10, SPRN_SRR0
mtspr SPRN_MD_EPN, r10
@@ -668,7 +668,7 @@ _ENTRY(FixupDAR_cmp)
beq+ 142f
cmpwi cr0, r10, 1964 /* Is icbi? */
beq+ 142f
-141: mfspr r10,SPRN_SPRG_SCRATCH2
+141: mfspr r10,SPRN_M_TW
b DARFixed /* Nope, go back to normal TLB processing */
200:
@@ -703,7 +703,7 @@ modified_instr:
bne+ 143f
subf r10,r0,r10 /* r10=r10-r0, only if reg RA is r0 */
143: mtdar r10 /* store faulting EA in DAR */
- mfspr r10,SPRN_SPRG_SCRATCH2
+ mfspr r10,SPRN_M_TW
b DARFixed /* Go back to normal TLB handling */
#else
mfctr r10
@@ -757,7 +757,7 @@ modified_instr:
mfdar r11
mtctr r11 /* restore ctr reg from DAR */
mtdar r10 /* save fault EA to DAR */
- mfspr r10,SPRN_SPRG_SCRATCH2
+ mfspr r10,SPRN_M_TW
b DARFixed /* Go back to normal TLB handling */
/* special handling for r10,r11 since these are modified already */
--
2.13.3
