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https://github.com/CloverHackyColor/CloverBootloader.git
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142 lines
4.4 KiB
C
142 lines
4.4 KiB
C
/** @file
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Implementation of synchronization functions on EBC.
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Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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/**
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Performs an atomic compare exchange operation on a 16-bit
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unsigned integer.
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Performs an atomic compare exchange operation on the 16-bit
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unsigned integer specified by Value. If Value is equal to
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CompareValue, then Value is set to ExchangeValue and
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CompareValue is returned. If Value is not equal to
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CompareValue, then Value is returned. The compare exchange
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operation must be performed using MP safe mechanisms.
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@param Value A pointer to the 16-bit value for the
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compare exchange operation.
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@param CompareValue 16-bit value used in compare operation.
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@param ExchangeValue 16-bit value used in exchange operation.
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@return The original *Value before exchange.
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**/
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UINT16
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EFIAPI
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InternalSyncCompareExchange16 (
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IN volatile UINT16 *Value,
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IN UINT16 CompareValue,
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IN UINT16 ExchangeValue
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)
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{
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return *Value != CompareValue ? *Value :
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((*Value = ExchangeValue), CompareValue);
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}
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/**
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Performs an atomic compare exchange operation on a 32-bit
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unsigned integer.
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Performs an atomic compare exchange operation on the 32-bit
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unsigned integer specified by Value. If Value is equal to
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CompareValue, then Value is set to ExchangeValue and
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CompareValue is returned. If Value is not equal to
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CompareValue, then Value is returned. The compare exchange
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operation must be performed using MP safe mechanisms.
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@param Value A pointer to the 32-bit value for the
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compare exchange operation.
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@param CompareValue 32-bit value used in compare operation.
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@param ExchangeValue 32-bit value used in exchange operation.
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@return The original *Value before exchange.
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**/
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UINT32
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EFIAPI
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InternalSyncCompareExchange32 (
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IN volatile UINT32 *Value,
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IN UINT32 CompareValue,
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IN UINT32 ExchangeValue
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)
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{
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return *Value != CompareValue ? *Value :
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((*Value = ExchangeValue), CompareValue);
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}
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/**
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Performs an atomic compare exchange operation on a 64-bit unsigned integer.
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Performs an atomic compare exchange operation on the 64-bit unsigned integer specified
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by Value. If Value is equal to CompareValue, then Value is set to ExchangeValue and
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CompareValue is returned. If Value is not equal to CompareValue, then Value is returned.
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The compare exchange operation must be performed using MP safe mechanisms.
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@param Value A pointer to the 64-bit value for the compare exchange
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operation.
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@param CompareValue 64-bit value used in compare operation.
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@param ExchangeValue 64-bit value used in exchange operation.
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@return The original *Value before exchange.
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**/
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UINT64
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EFIAPI
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InternalSyncCompareExchange64 (
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IN volatile UINT64 *Value,
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IN UINT64 CompareValue,
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IN UINT64 ExchangeValue
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)
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{
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return *Value != CompareValue ? *Value :
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((*Value = ExchangeValue), CompareValue);
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}
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/**
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Performs an atomic increment of an 32-bit unsigned integer.
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Performs an atomic increment of the 32-bit unsigned integer specified by
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Value and returns the incremented value. The increment operation must be
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performed using MP safe mechanisms. The state of the return value is not
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guaranteed to be MP safe.
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@param Value A pointer to the 32-bit value to increment.
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@return The incremented value.
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**/
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UINT32
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EFIAPI
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InternalSyncIncrement (
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IN volatile UINT32 *Value
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)
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{
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return ++*Value;
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}
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/**
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Performs an atomic decrement of an 32-bit unsigned integer.
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Performs an atomic decrement of the 32-bit unsigned integer specified by
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Value and returns the decrement value. The decrement operation must be
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performed using MP safe mechanisms. The state of the return value is not
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guaranteed to be MP safe.
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@param Value A pointer to the 32-bit value to decrement.
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@return The decrement value.
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**/
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UINT32
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EFIAPI
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InternalSyncDecrement (
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IN volatile UINT32 *Value
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)
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{
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return --*Value;
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}
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