From 7134a4591c65b5c72550341b069e1eed97030048 Mon Sep 17 00:00:00 2001
From: Arnon Gilboa <agilboa@redhat.com>
Date: Wed, 2 Feb 2011 11:21:11 +0200
Subject: [PATCH] define spice_mb MemoryBarrier for WIN64

__asm is not supported on _WIN64, so use macro instead
required for Windows x64 guest display driver (qxldd.dll)
---
 spice/barrier.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/spice/barrier.h b/spice/barrier.h
index 8c81c86..710da09 100644
--- a/spice/barrier.h
+++ b/spice/barrier.h
@@ -33,14 +33,23 @@
 #define _H_SPICE_BARRIER
 
 #ifdef __GNUC__
+
 #ifdef __i386__
 #define spice_mb() __asm__ __volatile__ ("lock; addl $0,0(%%esp)": : :"memory")
 #else
 //mfence
 #define spice_mb() __asm__ __volatile__ ("lock; addl $0,0(%%rsp)": : :"memory")
 #endif
+
+#else
+
+#ifdef _WIN64
+//__asm not supported on _WIN64, so use macro instead.
+#define spice_mb MemoryBarrier
 #else
 #define spice_mb() __asm {lock add [esp], 0}
 #endif
 
+#endif
+
 #endif /* _H_SPICE_BARRIER */