1 files changed, 47 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange64.asm b/Core/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange64.asm
new file mode 100644
index 0000000000..0fcbd230ee
--- /dev/null
+++ b/Core/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange64.asm
@@ -0,0 +1,47 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
+; 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.Asm
+;
+; Abstract:
+;
+;   InterlockedCompareExchange64 function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    .586P
+    .model  flat,C
+    .code
+
+;------------------------------------------------------------------------------
+; UINT64
+; EFIAPI
+; InternalSyncCompareExchange64 (
+;   IN      UINT64                    *Value,
+;   IN      UINT64                    CompareValue,
+;   IN      UINT64                    ExchangeValue
+;   );
+;------------------------------------------------------------------------------
+InternalSyncCompareExchange64   PROC    USES    esi ebx
+    mov     esi, [esp + 12]
+    mov     eax, [esp + 16]
+    mov     edx, [esp + 20]
+    mov     ebx, [esp + 24]
+    mov     ecx, [esp + 28]
+    lock    cmpxchg8b   qword ptr [esi]
+    ret
+InternalSyncCompareExchange64   ENDP
+
+    END