MdePkg/BaseSynchronizationLib: Add InterlockedCompareExchange16
This implements the function InterlockedCompareExchange16 () for all architectures, using architecture and toolchain specific intrinsics or primitive assembler instructions. Contributed-under: TianoCore Contribution Agreement 1.0 Reviewed-by: Olivier Martin <olivier.martin@arm.com> Acked-by: Jordan Justen <jordan.l.justen@intel.com> Reviewed-by: Michael Kinney <michael.d.kinney@intel.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@16966 6f19259b-4bc3-4df7-8a09-765794883524
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@@ -88,6 +88,50 @@ InternalSyncDecrement (
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}
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/**
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Performs an atomic compare exchange operation on a 16-bit unsigned integer.
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Performs an atomic compare exchange operation on the 16-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 16-bit value for the compare exchange
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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 OUT 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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__asm__ __volatile__ (
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"lock \n\t"
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"cmpxchgw %3, %1 "
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: "=a" (CompareValue),
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"=m" (*Value)
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: "a" (CompareValue),
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"r" (ExchangeValue),
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"m" (*Value)
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: "memory",
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"cc"
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);
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return CompareValue;
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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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@@ -0,0 +1,42 @@
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;------------------------------------------------------------------------------
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;
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; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
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; Copyright (c) 2015, Linaro Ltd. 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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;
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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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; Module Name:
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;
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; InterlockedCompareExchange16.Asm
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;
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; Abstract:
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;
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; InterlockedCompareExchange16 function
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;
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; Notes:
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;
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;------------------------------------------------------------------------------
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.code
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;------------------------------------------------------------------------------
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; UINT16
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; EFIAPI
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; InterlockedCompareExchange16 (
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; IN 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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InternalSyncCompareExchange16 PROC
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mov ax, dx
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lock cmpxchg [rcx], r8w
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ret
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InternalSyncCompareExchange16 ENDP
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END
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@@ -0,0 +1,54 @@
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/** @file
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InterlockedCompareExchange16 function
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Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
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Copyright (c) 2015, Linaro Ltd. 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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Microsoft Visual Studio 7.1 Function Prototypes for I/O Intrinsics.
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**/
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__int16 _InterlockedCompareExchange16(
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__int16 volatile * Destination,
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__int16 Exchange,
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__int16 Comperand
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);
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#pragma intrinsic(_InterlockedCompareExchange16)
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/**
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Performs an atomic compare exchange operation on a 16-bit unsigned integer.
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Performs an atomic compare exchange operation on the 16-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 16-bit value for the compare exchange
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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 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 _InterlockedCompareExchange16 (Value, ExchangeValue, CompareValue);
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}
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