diff options
| author |   Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
|---|---|---|
| committer | Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
| commit | af1a266670d040d2f4083ff309d732d648afba2a (patch) | |
| tree | 2fc46203448ddcc6f81546d379abfaeb323575e9 /roms/edk2/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange16.c | |
| parent | e02cda008591317b1625707ff8e115a4841aa889 (diff) | |
Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
Diffstat (limited to 'roms/edk2/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange16.c')
| -rw-r--r-- | roms/edk2/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange16.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/roms/edk2/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange16.c b/roms/edk2/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange16.c new file mode 100644 index 000000000..fef9d3bf5 --- /dev/null +++ b/roms/edk2/MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedCompareExchange16.c @@ -0,0 +1,45 @@ +/** @file
+ InterlockedCompareExchange16 function
+
+ Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>
+ Copyright (c) 2015, Linaro Ltd. All rights reserved.<BR>
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+
+
+
+/**
+ 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 volatile UINT16 *Value,
+ IN UINT16 CompareValue,
+ IN UINT16 ExchangeValue
+ )
+{
+ _asm {
+ mov ecx, Value
+ mov ax, CompareValue
+ mov dx, ExchangeValue
+ lock cmpxchg [ecx], dx
+ }
+}
+
|