MdePkg/BaseSynchronizationLib: Add InterlockedCompareExchange16

[mirror_edk2.git] / MdePkg / Library / BaseSynchronizationLib / X64 / InterlockedCompareExchange16.asm

diff --git a/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedCompareExchange16.asm b/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedCompareExchange16.asm
new file mode 100644 (file)
index 0000000..e01e9fa
--- /dev/null
+++ b/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedCompareExchange16.asm
@@ -0,0 +1,42 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
+; Copyright (c) 2015, Linaro Ltd. 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:
+;
+;   InterlockedCompareExchange16.Asm
+;
+; Abstract:
+;
+;   InterlockedCompareExchange16 function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    .code
+
+;------------------------------------------------------------------------------
+; UINT16
+; EFIAPI
+; InterlockedCompareExchange16 (
+;   IN      UINT16                    *Value,
+;   IN      UINT16                    CompareValue,
+;   IN      UINT16                    ExchangeValue
+;   );
+;------------------------------------------------------------------------------
+InternalSyncCompareExchange16   PROC
+    mov     ax, dx
+    lock    cmpxchg [rcx], r8w
+    ret
+InternalSyncCompareExchange16   ENDP
+
+    END