mirror of https://github.com/acidanthera/audk.git
100 lines
3.0 KiB
C
100 lines
3.0 KiB
C
/** @file
|
|
Implementation of synchronization functions on EBC.
|
|
|
|
Copyright (c) 2006, Intel Corporation<BR>
|
|
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: Synchronization.c
|
|
|
|
**/
|
|
|
|
UINT32
|
|
EFIAPI
|
|
InternalSyncCompareExchange32 (
|
|
IN volatile UINT32 *Value,
|
|
IN UINT32 CompareValue,
|
|
IN UINT32 ExchangeValue
|
|
)
|
|
{
|
|
return *Value != CompareValue ? *Value :
|
|
((*Value = ExchangeValue), CompareValue);
|
|
}
|
|
|
|
/**
|
|
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 64-bit value used in compare operation.
|
|
@param ExchangeValue 64-bit value used in exchange operation.
|
|
|
|
@return The original *Value before exchange.
|
|
|
|
**/
|
|
UINT64
|
|
EFIAPI
|
|
InternalSyncCompareExchange64 (
|
|
IN volatile UINT64 *Value,
|
|
IN UINT64 CompareValue,
|
|
IN UINT64 ExchangeValue
|
|
)
|
|
{
|
|
return *Value != CompareValue ? *Value :
|
|
((*Value = ExchangeValue), CompareValue);
|
|
}
|
|
|
|
/**
|
|
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.
|
|
|
|
@param Value A pointer to the 32-bit value to increment.
|
|
|
|
@return The incremented value.
|
|
|
|
**/
|
|
UINT32
|
|
EFIAPI
|
|
InternalSyncIncrement (
|
|
IN volatile UINT32 *Value
|
|
)
|
|
{
|
|
return ++*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 decrement value. The decrement operation must be
|
|
performed using MP safe mechanisms. The state of the return value is not
|
|
guaranteed to be MP safe.
|
|
|
|
@param Value A pointer to the 32-bit value to decrement.
|
|
|
|
@return The decrement value.
|
|
|
|
**/
|
|
UINT32
|
|
EFIAPI
|
|
InternalSyncDecrement (
|
|
IN volatile UINT32 *Value
|
|
)
|
|
{
|
|
return --*Value;
|
|
}
|