MdePkg/Library/BaseSynchronizationLib/Ia32/GccInline.c File Reference


Functions

UINT32 EFIAPI InternalSyncIncrement (IN volatile UINT32 *Value)
UINT32 EFIAPI InternalSyncDecrement (IN volatile UINT32 *Value)
UINT16 EFIAPI InternalSyncCompareExchange16 (IN OUT volatile UINT16 *Value, IN UINT16 CompareValue, IN UINT16 ExchangeValue)
UINT32 EFIAPI InternalSyncCompareExchange32 (IN OUT volatile UINT32 *Value, IN UINT32 CompareValue, IN UINT32 ExchangeValue)
UINT64 EFIAPI InternalSyncCompareExchange64 (IN OUT volatile UINT64 *Value, IN UINT64 CompareValue, IN UINT64 ExchangeValue)

Detailed Description

GCC inline implementation of BaseSynchronizationLib processor specific functions.

Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.
Portions copyright (c) 2008 - 2009, Apple Inc. 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.


Function Documentation

UINT16 EFIAPI InternalSyncCompareExchange16 ( IN OUT volatile UINT16 Value,
IN UINT16  CompareValue,
IN UINT16  ExchangeValue 
)

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.

Parameters:
Value A pointer to the 16-bit value for the compare exchange operation.
CompareValue 16-bit value used in compare operation.
ExchangeValue 16-bit value used in exchange operation.
Returns:
The original *Value before exchange.

UINT32 EFIAPI InternalSyncCompareExchange32 ( IN OUT volatile UINT32 Value,
IN UINT32  CompareValue,
IN UINT32  ExchangeValue 
)

Performs an atomic compare exchange operation on a 32-bit unsigned integer.

Performs an atomic compare exchange operation on the 32-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.

Parameters:
Value A pointer to the 32-bit value for the compare exchange operation.
CompareValue 32-bit value used in compare operation.
ExchangeValue 32-bit value used in exchange operation.
Returns:
The original *Value before exchange.

UINT64 EFIAPI InternalSyncCompareExchange64 ( IN OUT volatile UINT64 Value,
IN UINT64  CompareValue,
IN UINT64  ExchangeValue 
)

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.

Parameters:
Value A pointer to the 64-bit value for the compare exchange operation.
CompareValue 64-bit value used in compare operation.
ExchangeValue 64-bit value used in exchange operation.
Returns:
The original *Value before exchange.

UINT32 EFIAPI InternalSyncDecrement ( IN volatile UINT32 Value  ) 

Performs an atomic decrement of an 32-bit unsigned integer.

Performs an atomic decrement of the 32-bit unsigned integer specified by Value and returns the decremented value. The decrement operation must be performed using MP safe mechanisms. The state of the return value is not guaranteed to be MP safe.

Parameters:
Value A pointer to the 32-bit value to decrement.
Returns:
The decremented value.

Referenced by InterlockedDecrement().

UINT32 EFIAPI InternalSyncIncrement ( IN volatile UINT32 Value  ) 

Performs an atomic increment of an 32-bit unsigned integer.

Performs an atomic increment of the 32-bit unsigned integer specified by Value and returns the incremented value. The increment operation must be performed using MP safe mechanisms. The state of the return value is not guaranteed to be MP safe.

Parameters:
Value A pointer to the 32-bit value to increment.
Returns:
The incremented value.

Referenced by InterlockedIncrement().


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