diff options
| author | Guo Mang <mang.guo@intel.com> | 2016-12-22 15:57:14 +0800 |
|---|---|---|
| committer | Guo Mang <mang.guo@intel.com> | 2016-12-26 19:14:41 +0800 |
| commit | 1760cf81e4b1847c6823ea3514a78dd120e19b6e (patch) | |
| tree | 64a874b14050fe24d3bbc1bc13cd293abf8ae018 /Core/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange64.c | |
| parent | 7f05fa00f73038b425002566d3afe6c3ade2ccdb (diff) | |
| download | edk2-platforms-1760cf81e4b1847c6823ea3514a78dd120e19b6e.tar.xz | |
MdePkg: Move to new location
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Guo Mang <mang.guo@intel.com>
Diffstat (limited to 'Core/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange64.c')
| -rw-r--r-- | Core/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange64.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange64.c b/Core/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange64.c new file mode 100644 index 0000000000..73af6ef91a --- /dev/null +++ b/Core/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange64.c @@ -0,0 +1,50 @@ +/** @file
+ InterlockedCompareExchange64 function
+
+ Copyright (c) 2006 - 2010, Intel Corporation. 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.
+
+**/
+
+
+
+
+/**
+ Performs an atomic compare exchange operation on a 64-bit unsigned integer.
+
+ Performs an atomic compare exchange operation on the 64-bit unsigned integer specified
+ by Value. If Value is equal to CompareValue, then Value is set to ExchangeValue and
+ CompareValue is returned. If Value is not equal to CompareValue, then Value is returned.
+ The compare exchange operation must be performed using MP safe mechanisms.
+
+ @param Value A pointer to the 64-bit value for the compare exchange
+ operation.
+ @param CompareValue A 64-bit value used in a compare operation.
+ @param ExchangeValue A 64-bit value used in an exchange operation.
+
+ @return The original *Value before exchange.
+
+**/
+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]
+ }
+}
|