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[XenPPC] [xenppc-unstable] [POWERPC][XEN] Erratum: Must clear larx/stcx
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| Subject: | [XenPPC] [xenppc-unstable] [POWERPC][XEN] Erratum: Must clear larx/stcx reservation on exception |
| From: | Xen patchbot-xenppc-unstable <patchbot-xenppc-unstable@xxxxxxxxxxxxxxxxxxx> |
| Date: | Fri, 01 Sep 2006 17:30:35 +0000 |
| Delivery-date: | Fri, 01 Sep 2006 10:32:52 -0700 |
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# HG changeset patch
# User Jimi Xenidis <jimix@xxxxxxxxxxxxxx>
# Node ID e79db5ceaa18474ee9a2a60734e64b9ee551e501
# Parent 033d5a33092daee41320e74dd8d8d8fddffe15dc
[POWERPC][XEN] Erratum: Must clear larx/stcx reservation on exception
PowerPC 970 Erratum that an "OS should execute a stcx in
the interrupt handler to clear the reservation."
---
xen/arch/powerpc/powerpc64/exceptions.S | 3 +++
1 files changed, 3 insertions(+)
diff -r 033d5a33092d -r e79db5ceaa18 xen/arch/powerpc/powerpc64/exceptions.S
--- a/xen/arch/powerpc/powerpc64/exceptions.S Thu Aug 31 17:47:11 2006 -0400
+++ b/xen/arch/powerpc/powerpc64/exceptions.S Fri Sep 01 11:42:51 2006 -0400
@@ -114,6 +114,9 @@ 1:
stw r0, UREGS_cr(r1) /* save CR */
mfspr r0, SPRN_HSPRG1
std r0, UREGS_r13(r1) /* save R13 from HSPRG1 */
+
+ /* Blow away any reservation according to 970 errata after saving CR */
+ stdcx. r1, 0, r1
/* done with processor_area; re-enable MSR:RI */
mfmsr r0
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