lkml.org 
[lkml]   [2018]   [May]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v2 11/14] powerpc/8xx: Free up SPRN_SPRG_SCRATCH2
Date
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.leroy@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 0c3cfaa4e6f3..f65bd6fd1572 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
\
 
 \ /
  Last update: 2018-05-16 12:08    [W:0.051 / U:1.868 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site