mirror of https://github.com/acidanthera/audk.git
MdePkg/BaseSynchronizationLib: Added proper support for ARM architecture
This implements the following synchronization primitives for AArch64 (GCC) and ARM (GCC & RVCT): InternalSyncCompareExchange32 InternalSyncCompareExchange64 InternalSyncIncrement InternalSyncDecrement Note: these functions are implemented using the exclusive monitor, which implies that they can only be used after the caches (and hence the MMU) have been enabled. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Olivier Martin <olivier.martin@arm.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Laszlo Ersek <lersek@redhat.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16965 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Olivier Martin
lersek
parent
f98490369f
commit
cc3104283f
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@ -0,0 +1,159 @@
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// Implementation of synchronization functions for ARM architecture (AArch64)
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//
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// Copyright (c) 2012-2015, ARM Limited. All rights reserved.
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// Copyright (c) 2015, Linaro Limited. All rights reserved.
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//
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// This program and the accompanying materials
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// are licensed and made available under the terms and conditions of the BSD License
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// which accompanies this distribution. The full text of the license may be found at
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// http://opensource.org/licenses/bsd-license.php
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//
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// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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//
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//
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.text
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.align 3
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GCC_ASM_EXPORT(InternalSyncCompareExchange32)
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GCC_ASM_EXPORT(InternalSyncCompareExchange64)
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GCC_ASM_EXPORT(InternalSyncIncrement)
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GCC_ASM_EXPORT(InternalSyncDecrement)
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/**
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Performs an atomic compare exchange operation on a 32-bit unsigned integer.
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Performs an atomic compare exchange operation on the 32-bit unsigned integer
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specified by Value. If Value is equal to CompareValue, then Value is set to
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ExchangeValue and CompareValue is returned. If Value is not equal to CompareValue,
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then Value is returned. The compare exchange operation must be performed using
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MP safe mechanisms.
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@param Value A pointer to the 32-bit value for the compare exchange
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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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ASM_PFX(InternalSyncCompareExchange32):
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dmb sy
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InternalSyncCompareExchange32Again:
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ldxr w3, [x0]
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cmp w3, w1
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bne InternalSyncCompareExchange32Fail
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InternalSyncCompareExchange32Exchange:
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stxr w4, w2, [x0]
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cbnz w4, InternalSyncCompareExchange32Again
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InternalSyncCompareExchange32Fail:
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dmb sy
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mov w0, w3
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ret
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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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ASM_PFX(InternalSyncCompareExchange64):
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dmb sy
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InternalSyncCompareExchange64Again:
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ldxr x3, [x0]
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cmp x3, x1
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bne InternalSyncCompareExchange64Fail
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InternalSyncCompareExchange64Exchange:
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stxr w4, x2, [x0]
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cbnz w4, InternalSyncCompareExchange64Again
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InternalSyncCompareExchange64Fail:
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dmb sy
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mov x0, x3
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ret
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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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ASM_PFX(InternalSyncIncrement):
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dmb sy
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TryInternalSyncIncrement:
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ldxr w1, [x0]
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add w1, w1, #1
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stxr w2, w1, [x0]
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cbnz w2, TryInternalSyncIncrement
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dmb sy
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ret
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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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ASM_PFX(InternalSyncDecrement):
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dmb sy
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TryInternalSyncDecrement:
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ldxr w1, [x0]
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sub w1, w1, #1
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stxr w2, w1, [x0]
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cbnz w2, TryInternalSyncDecrement
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dmb sy
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ret
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@ -1,115 +0,0 @@
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/** @file
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Implementation of synchronization functions. Still needs to be ported
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Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
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Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php.
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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/**
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Performs an atomic compare exchange operation on a 32-bit unsigned integer.
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Performs an atomic compare exchange operation on the 32-bit unsigned integer
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specified by Value. If Value is equal to CompareValue, then Value is set to
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ExchangeValue and CompareValue is returned. If Value is not equal to CompareValue,
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then Value is returned. The compare exchange operation must be performed using
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MP safe mechanisms.
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@param Value A pointer to the 32-bit value for the compare exchange
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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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@ -0,0 +1,167 @@
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// Implementation of synchronization functions for ARM architecture
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//
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// Copyright (c) 2012-2015, ARM Limited. All rights reserved.
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//
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// This program and the accompanying materials
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// are licensed and made available under the terms and conditions of the BSD License
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// which accompanies this distribution. The full text of the license may be found at
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// http://opensource.org/licenses/bsd-license.php
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//
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// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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//
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//
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.text
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.align 3
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GCC_ASM_EXPORT(InternalSyncCompareExchange32)
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GCC_ASM_EXPORT(InternalSyncCompareExchange64)
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GCC_ASM_EXPORT(InternalSyncIncrement)
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GCC_ASM_EXPORT(InternalSyncDecrement)
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/**
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Performs an atomic compare exchange operation on a 32-bit unsigned integer.
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Performs an atomic compare exchange operation on the 32-bit unsigned integer
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specified by Value. If Value is equal to CompareValue, then Value is set to
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ExchangeValue and CompareValue is returned. If Value is not equal to CompareValue,
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then Value is returned. The compare exchange operation must be performed using
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MP safe mechanisms.
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@param Value A pointer to the 32-bit value for the compare exchange
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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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ASM_PFX(InternalSyncCompareExchange32):
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dmb
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InternalSyncCompareExchange32Again:
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ldrex r3, [r0]
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cmp r3, r1
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bne InternalSyncCompareExchange32Fail
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InternalSyncCompareExchange32Exchange:
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strex ip, r2, [r0]
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cmp ip, #0
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bne InternalSyncCompareExchange32Again
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InternalSyncCompareExchange32Fail:
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dmb
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mov r0, r3
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bx lr
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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, // r0
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// IN UINT64 CompareValue, // r2-r3
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// IN UINT64 ExchangeValue // stack
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// )
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ASM_PFX(InternalSyncCompareExchange64):
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push { r4-r7 }
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ldrd r4, r5, [sp, #16]
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dmb
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InternalSyncCompareExchange64Again:
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ldrexd r6, r7, [r0]
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cmp r6, r2
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cmpeq r7, r3
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bne InternalSyncCompareExchange64Fail
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InternalSyncCompareExchange64Exchange:
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strexd ip, r4, r5, [r0]
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cmp ip, #0
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bne InternalSyncCompareExchange64Again
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InternalSyncCompareExchange64Fail:
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dmb
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mov r0, r6
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mov r1, r7
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pop { r4-r7 }
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bx lr
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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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ASM_PFX(InternalSyncIncrement):
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dmb
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TryInternalSyncIncrement:
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ldrex r1, [r0]
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add r1, r1, #1
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strex r2, r1, [r0]
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cmp r2, #0
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bne TryInternalSyncIncrement
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dmb
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bx lr
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/**
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Performs an atomic decrement of an 32-bit unsigned integer.
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|
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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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|
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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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ASM_PFX(InternalSyncDecrement):
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dmb
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TryInternalSyncDecrement:
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ldrex r1, [r0]
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sub r1, r1, #1
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strex r2, r1, [r0]
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cmp r2, #0
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bne TryInternalSyncDecrement
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dmb
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bx lr
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|
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@ -0,0 +1,168 @@
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// Implementation of synchronization functions for ARM architecture
|
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//
|
||||
// Copyright (c) 2012-2015, ARM Limited. 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.
|
||||
//
|
||||
//
|
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EXPORT InternalSyncCompareExchange32
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EXPORT InternalSyncCompareExchange64
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EXPORT InternalSyncIncrement
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EXPORT InternalSyncDecrement
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AREA ArmSynchronization, CODE, READONLY
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/**
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Performs an atomic compare exchange operation on a 32-bit unsigned integer.
|
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|
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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
|
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ExchangeValue and CompareValue is returned. If Value is not equal to CompareValue,
|
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then Value is returned. The compare exchange operation must be performed using
|
||||
MP safe mechanisms.
|
||||
|
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@param Value A pointer to the 32-bit value for the 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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//UINT32
|
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//EFIAPI
|
||||
//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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InternalSyncCompareExchange32
|
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dmb
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|
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InternalSyncCompareExchange32Again
|
||||
ldrex r3, [r0]
|
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cmp r3, r1
|
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bne InternalSyncCompareExchange32Fail
|
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|
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InternalSyncCompareExchange32Exchange
|
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strex ip, r2, [r0]
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cmp ip, #0
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bne InternalSyncCompareExchange32Again
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|
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InternalSyncCompareExchange32Fail
|
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dmb
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mov r0, r3
|
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bx lr
|
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|
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/**
|
||||
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, // r0
|
||||
// IN UINT64 CompareValue, // r2-r3
|
||||
// IN UINT64 ExchangeValue // stack
|
||||
// )
|
||||
InternalSyncCompareExchange64
|
||||
push { r4-r7 }
|
||||
ldrd r4, r5, [sp, #16]
|
||||
dmb
|
||||
|
||||
InternalSyncCompareExchange64Again
|
||||
ldrexd r6, r7, [r0]
|
||||
cmp r6, r2
|
||||
cmpeq r7, r3
|
||||
bne InternalSyncCompareExchange64Fail
|
||||
|
||||
InternalSyncCompareExchange64Exchange
|
||||
strexd ip, r4, r5, [r0]
|
||||
cmp ip, #0
|
||||
bne InternalSyncCompareExchange64Again
|
||||
|
||||
InternalSyncCompareExchange64Fail
|
||||
dmb
|
||||
mov r0, r6
|
||||
mov r1, r7
|
||||
pop { r4-r7 }
|
||||
bx lr
|
||||
|
||||
/**
|
||||
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
|
||||
// )
|
||||
InternalSyncIncrement
|
||||
dmb
|
||||
TryInternalSyncIncrement
|
||||
ldrex r1, [r0]
|
||||
add r1, r1, #1
|
||||
strex r2, r1, [r0]
|
||||
cmp r2, #0
|
||||
bne TryInternalSyncIncrement
|
||||
dmb
|
||||
bx lr
|
||||
|
||||
/**
|
||||
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
|
||||
// )
|
||||
InternalSyncDecrement
|
||||
dmb
|
||||
TryInternalSyncDecrement
|
||||
ldrex r1, [r0]
|
||||
sub r1, r1, #1
|
||||
strex r2, r1, [r0]
|
||||
cmp r2, #0
|
||||
bne TryInternalSyncDecrement
|
||||
dmb
|
||||
bx lr
|
||||
|
||||
END
|
||||
|
|
@ -1,115 +0,0 @@
|
|||
/** @file
|
||||
Implementation of synchronization functions. Still needs to be ported
|
||||
|
||||
Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
|
||||
Portions copyright (c) 2008 - 2009, Apple Inc. 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 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.
|
||||
|
||||
@param Value A pointer to the 32-bit value for the compare exchange
|
||||
operation.
|
||||
@param CompareValue 32-bit value used in compare operation.
|
||||
@param ExchangeValue 32-bit value used in exchange operation.
|
||||
|
||||
@return The original *Value before exchange.
|
||||
|
||||
**/
|
||||
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;
|
||||
}
|
||||
|
|
@ -78,11 +78,12 @@
|
|||
|
||||
[Sources.ARM]
|
||||
Synchronization.c
|
||||
Arm/Synchronization.c
|
||||
Arm/Synchronization.asm | RVCT
|
||||
Arm/Synchronization.S | GCC
|
||||
|
||||
[Sources.AARCH64]
|
||||
Synchronization.c
|
||||
AArch64/Synchronization.c
|
||||
AArch64/Synchronization.S
|
||||
|
||||
[Packages]
|
||||
MdePkg/MdePkg.dec
|
||||
|
|
|
|||
Loading…
Reference in New Issue