MdePkg BaseSynchronizationLib: Convert X64/InterlockedCompareExchange16.asm to NASM

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

diff --git a/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedCompareExchange16.nasm b/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedCompareExchange16.nasm
new file mode 100644 (file)
index 0000000..1d72d07
--- /dev/null
+++ b/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedCompareExchange16.nasm
@@ -0,0 +1,42 @@
+;------------------------------------------------------------------------------\r
+;\r
+; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>\r
+; Copyright (c) 2015, Linaro Ltd. All rights reserved.<BR>\r
+; 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
+;   InterlockedCompareExchange16.Asm\r
+;\r
+; Abstract:\r
+;\r
+;   InterlockedCompareExchange16 function\r
+;\r
+; Notes:\r
+;\r
+;------------------------------------------------------------------------------\r
+\r
+    DEFAULT REL\r
+    SECTION .text\r
+\r
+;------------------------------------------------------------------------------\r
+; UINT16\r
+; EFIAPI\r
+; InterlockedCompareExchange16 (\r
+;   IN      UINT16                    *Value,\r
+;   IN      UINT16                    CompareValue,\r
+;   IN      UINT16                    ExchangeValue\r
+;   );\r
+;------------------------------------------------------------------------------\r
+global ASM_PFX(InternalSyncCompareExchange16)\r
+ASM_PFX(InternalSyncCompareExchange16):\r
+    mov     ax, dx\r
+    lock    cmpxchg [rcx], r8w\r
+    ret\r
+\r