Moved the MdePkg to OldMdePkg so that new code in MdePkg does not break existing...

[mirror_edk2.git] / OldMdePkg / Library / BaseLib / X64 / InterlockedCompareExchange64.asm

diff --git a/OldMdePkg/Library/BaseLib/X64/InterlockedCompareExchange64.asm b/OldMdePkg/Library/BaseLib/X64/InterlockedCompareExchange64.asm
new file mode 100644 (file)
index 0000000..88c25a5
--- /dev/null
+++ b/OldMdePkg/Library/BaseLib/X64/InterlockedCompareExchange64.asm
@@ -0,0 +1,41 @@
+;------------------------------------------------------------------------------\r
+;\r
+; Copyright (c) 2006, Intel Corporation\r
+; All rights reserved. This program and the accompanying materials\r
+; are licensed and made available under the terms and conditions of the BSD License\r
+; which accompanies this distribution.  The full text of the license may be found at\r
+; http://opensource.org/licenses/bsd-license.php\r
+;\r
+; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
+; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
+;\r
+; Module Name:\r
+;\r
+;   InterlockedCompareExchange64.Asm\r
+;\r
+; Abstract:\r
+;\r
+;   InterlockedCompareExchange64 function\r
+;\r
+; Notes:\r
+;\r
+;------------------------------------------------------------------------------\r
+\r
+    .code\r
+\r
+;------------------------------------------------------------------------------\r
+; UINT64\r
+; EFIAPI\r
+; InterlockedCompareExchange64 (\r
+;   IN      UINT64                    *Value,\r
+;   IN      UINT64                    CompareValue,\r
+;   IN      UINT64                    ExchangeValue\r
+;   );\r
+;------------------------------------------------------------------------------\r
+InternalSyncCompareExchange64   PROC\r
+    mov     rax, rdx\r
+    lock    cmpxchg [rcx], r8\r
+    ret\r
+InternalSyncCompareExchange64   ENDP\r
+\r
+    END\r