# HG changeset patch
# User Jimi Xenidis <[EMAIL PROTECTED]>
# Node ID 25442712f4cb2de72b1dd9dbdb471942c84ceca3
# Parent 1d50658481071d73564b4d722e3d3199104c481a
[POWERPC][XEN] Better explane the larx/stcx issue with interrupts
Signed-off-by: Jimi Xenidis <[EMAIL PROTECTED]>
---
xen/arch/powerpc/powerpc64/exceptions.S | 6 +++++-
1 files changed, 5 insertions(+), 1 deletion(-)
diff -r 1d5065848107 -r 25442712f4cb xen/arch/powerpc/powerpc64/exceptions.S
--- a/xen/arch/powerpc/powerpc64/exceptions.S Thu Sep 14 01:41:13 2006 -0400
+++ b/xen/arch/powerpc/powerpc64/exceptions.S Thu Sep 14 10:17:23 2006 -0400
@@ -118,7 +118,11 @@ 1:
mfspr r0, SPRN_HSPRG1
std r0, UREGS_r13(r1) /* save R13 from HSPRG1 */
- /* Blow away any reservation according to 970 errata after saving CR */
+ /* Only _one_ larx is allowed at a time. Any future use will be
+ * rejected until the earlier one (if any) completes. Since we
+ * may have interrupted a larx in the Domain, or Xen we need to
+ * clear any larx that may currently exist. We could probably
+ * skip which for hcalls */
ldx r0, 0, r1
stdcx. r0, 0, r1
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