From 69d419f31383ac7801e1debb62d5bbf7cb899e3c Mon Sep 17 00:00:00 2001
From: Ali Saidi <Ali.Saidi@ARM.com>
Date: Mon, 7 Jan 2013 13:05:33 -0500
Subject: o3: Fix issue with LLSC ordering and speculation

This patch unlocks the cpu-local monitor when the CPU sees a snoop to a locked
address. Previously we relied on the cache to handle the locking for us, however
some users on the gem5 mailing list reported a case where the cpu speculatively
executes a ll operation after a pending sc operation in the pipeline and that
makes the cache monitor valid. This should handle that case by invaliding the
local monitor.
---
 src/arch/x86/locked_mem.hh | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'src/arch/x86')

diff --git a/src/arch/x86/locked_mem.hh b/src/arch/x86/locked_mem.hh
index 496486997..c2a8395aa 100644
--- a/src/arch/x86/locked_mem.hh
+++ b/src/arch/x86/locked_mem.hh
@@ -37,10 +37,17 @@
  * ISA-specific helper functions for locked memory accesses.
  */
 
+#include "mem/packet.hh"
 #include "mem/request.hh"
 
 namespace X86ISA
 {
+    template <class XC>
+    inline void
+    handleLockedSnoop(XC *xc, PacketPtr pkt, Addr cacheBlockMask)
+    {
+    }
+
     template <class XC>
     inline void
     handleLockedRead(XC *xc, Request *req)
-- 
cgit v1.2.3