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/InterlockedCompareExchange16.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/InterlockedCompareExchange16.c')
| -rw-r--r-- | Core/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange16.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/Core/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange16.c b/Core/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange16.c new file mode 100644 index 0000000000..3d5213743e --- /dev/null +++ b/Core/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange16.c @@ -0,0 +1,51 @@ +/** @file
+ InterlockedCompareExchange16 function
+
+ Copyright (c) 2006 - 2010, 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.
+
+**/
+
+
+
+
+/**
+ Performs an atomic compare exchange operation on a 16-bit unsigned integer.
+
+ Performs an atomic compare exchange operation on the 16-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 16-bit value for the compare exchange
+ operation.
+ @param CompareValue 16-bit value used in compare operation.
+ @param ExchangeValue 16-bit value used in exchange operation.
+
+ @return The original *Value before exchange.
+
+**/
+UINT16
+EFIAPI
+InternalSyncCompareExchange16 (
+ IN UINT16 *Value,
+ IN UINT16 CompareValue,
+ IN UINT16 ExchangeValue
+ )
+{
+ _asm {
+ mov ecx, Value
+ mov ax, CompareValue
+ mov dx, ExchangeValue
+ lock cmpxchg [ecx], dx
+ }
+}
+
|