1 files changed, 36 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/Ia32/InterlockedCompareExchange64.c b/MdePkg/Library/BaseLib/Ia32/InterlockedCompareExchange64.c
new file mode 100644
index 0000000000..a0d0ba89e1
--- /dev/null
+++ b/MdePkg/Library/BaseLib/Ia32/InterlockedCompareExchange64.c
@@ -0,0 +1,36 @@
+/** @file
+  InterlockedCompareExchange64 function
+
+  Copyright (c) 2006 - 2007, Intel Corporation<BR>
+  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.
+
+**/
+
+//
+// Include common header file for this module.
+//
+#include "CommonHeader.h"
+
+UINT64
+EFIAPI
+InternalSyncCompareExchange64 (
+  IN      UINT64                    *Value,
+  IN      UINT64                    CompareValue,
+  IN      UINT64                    ExchangeValue
+  )
+{
+  _asm {
+    mov     esi, Value
+    mov     eax, dword ptr [CompareValue + 0]
+    mov     edx, dword ptr [CompareValue + 4]
+    mov     ebx, dword ptr [ExchangeValue + 0]
+    mov     ecx, dword ptr [ExchangeValue + 4]
+    lock    cmpxchg8b   qword ptr [esi]
+  }
+}