diff options
Diffstat (limited to 'MdePkg/Library/BaseSynchronizationLib/X64/InterlockedCompareExchange64.S')
-rw-r--r-- | MdePkg/Library/BaseSynchronizationLib/X64/InterlockedCompareExchange64.S | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedCompareExchange64.S b/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedCompareExchange64.S new file mode 100644 index 0000000000..5e6e163527 --- /dev/null +++ b/MdePkg/Library/BaseSynchronizationLib/X64/InterlockedCompareExchange64.S @@ -0,0 +1,39 @@ +#------------------------------------------------------------------------------
+#
+# Copyright (c) 2006 - 2008, Intel Corporation
+# 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.
+#
+# Module Name:
+#
+# InterlockedCompareExchange64.S
+#
+# Abstract:
+#
+# InterlockedCompareExchange64 function
+#
+# Notes:
+#
+#------------------------------------------------------------------------------
+
+
+#------------------------------------------------------------------------------
+# UINT64
+# EFIAPI
+# InterlockedCompareExchange64 (
+# IN UINT64 *Value,
+# IN UINT64 CompareValue,
+# IN UINT64 ExchangeValue
+# );
+#------------------------------------------------------------------------------
+.global ASM_PFX(InternalSyncCompareExchange64)
+.align 16
+ASM_PFX(InternalSyncCompareExchange64):
+ mov %rdx, %rax
+ lock cmpxchg %r8,(%rcx)
+ ret
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