Split out Synchronization Library from Base Library

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@7377 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange64.S

@@ -0,0 +1,47 @@
+#------------------------------------------------------------------------------
+#
+# Copyright (c) 2006 - 2008, Intel Corporation
+# All rights reserved. This program and the accompanying materials
+# are licensed and made available under the terms and conditions of the BSD License
+# which accompanies this distribution.  The full text of the license may be found at
+# http://opensource.org/licenses/bsd-license.php
+#
+# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#
+# Module Name:
+#
+#   InterlockedCompareExchange64.S
+#
+# Abstract:
+#
+#   InternalSyncCompareExchange64 function
+#
+# Notes:
+#
+#------------------------------------------------------------------------------
+
+.globl ASM_PFX(InternalSyncCompareExchange64)
+
+#------------------------------------------------------------------------------
+# UINT64
+# EFIAPI
+# InternalSyncCompareExchange64 (
+#   IN      UINT64                    *Value,
+#   IN      UINT64                    CompareValue,
+#   IN      UINT64                    ExchangeValue
+#   );
+#------------------------------------------------------------------------------
+ASM_PFX(InternalSyncCompareExchange64):
+    push    %esi
+    push    %ebx
+    movl    12(%esp), %esi
+    movl    16(%esp), %eax
+    movl    20(%esp), %edx
+    movl    24(%esp), %ebx
+    movl    28(%esp), %ecx
+    lock
+    cmpxchg8b   (%esi)
+    pop     %ebx
+    pop     %esi
+    ret