aboutsummaryrefslogtreecommitdiff
path: root/arch/powerpc/kernel
diff options
context:
space:
mode:
Diffstat (limited to 'arch/powerpc/kernel')
-rw-r--r--arch/powerpc/kernel/tm.S18
1 files changed, 16 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/tm.S b/arch/powerpc/kernel/tm.S
index 2da67e7a16d5..51be8fb24803 100644
--- a/arch/powerpc/kernel/tm.S
+++ b/arch/powerpc/kernel/tm.S
@@ -112,9 +112,18 @@ _GLOBAL(tm_reclaim)
std r3, STACK_PARAM(0)(r1)
SAVE_NVGPRS(r1)
+ /* We need to setup MSR for VSX register save instructions. Here we
+ * also clear the MSR RI since when we do the treclaim, we won't have a
+ * valid kernel pointer for a while. We clear RI here as it avoids
+ * adding another mtmsr closer to the treclaim. This makes the region
+ * maked as non-recoverable wider than it needs to be but it saves on
+ * inserting another mtmsrd later.
+ */
mfmsr r14
mr r15, r14
ori r15, r15, MSR_FP
+ li r16, MSR_RI
+ andc r15, r15, r16
oris r15, r15, MSR_VEC@h
#ifdef CONFIG_VSX
BEGIN_FTR_SECTION
@@ -349,9 +358,10 @@ restore_gprs:
mtcr r5
mtxer r6
- /* MSR and flags: We don't change CRs, and we don't need to alter
- * MSR.
+ /* Clear the MSR RI since we are about to change R1. EE is already off
*/
+ li r4, 0
+ mtmsrd r4, 1
REST_4GPRS(0, r7) /* GPR0-3 */
REST_GPR(4, r7) /* GPR4-6 */
@@ -377,6 +387,10 @@ restore_gprs:
GET_PACA(r13)
GET_SCRATCH0(r1)
+ /* R1 is restored, so we are recoverable again. EE is still off */
+ li r4, MSR_RI
+ mtmsrd r4, 1
+
REST_NVGPRS(r1)
addi r1, r1, TM_FRAME_SIZE