4cee954ea8
The SpinLock functions in the SynchronicationLib use volatile parameters to keep compiler from optimizing these functions too much. The volatile keyword is missing from the Interlocked*() functions in this same library instance. Update the library instance to consistently use volatile on all functions in the SynchronizationLib class. Cc: Liming Gao <liming.gao@intel.com> Cc: Laszlo Ersek <lersek@redhat.com> Cc: Andrew Fish <afish@apple.com> Cc: Jeff Fan <jeff.fan@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Michael Kinney <michael.d.kinney@intel.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Liming Gao <liming.gao@intel.com>
47 lines
1.5 KiB
NASM
47 lines
1.5 KiB
NASM
;------------------------------------------------------------------------------
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;
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; Copyright (c) 2006 - 2016, 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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.486
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.model flat,C
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.code
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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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InternalSyncCompareExchange16 PROC
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mov ecx, [esp + 4]
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mov ax, [esp + 8]
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mov dx, [esp + 12]
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lock cmpxchg [ecx], dx
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ret
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InternalSyncCompareExchange16 ENDP
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END
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