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[mirror_edk2.git] / MdePkg / Library / BaseSynchronizationLib / Ia32 / InterlockedCompareExchange16.c

/** @file\r
  InterlockedCompareExchange16 function\r
\r
  Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>\r
  Copyright (c) 2015, Linaro Ltd. All rights reserved.<BR>\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
/**\r
  Performs an atomic compare exchange operation on a 16-bit unsigned integer.\r
\r
  Performs an atomic compare exchange operation on the 16-bit unsigned integer\r
  specified by Value.  If Value is equal to CompareValue, then Value is set to\r
  ExchangeValue and CompareValue is returned.  If Value is not equal to CompareValue,\r
  then Value is returned.  The compare exchange operation must be performed using\r
  MP safe mechanisms.\r
\r
  @param  Value         A pointer to the 16-bit value for the compare exchange\r
                        operation.\r
  @param  CompareValue  16-bit value used in compare operation.\r
  @param  ExchangeValue 16-bit value used in exchange operation.\r
\r
  @return The original *Value before exchange.\r
\r
**/\r
UINT16\r
EFIAPI\r
InternalSyncCompareExchange16 (\r
  IN      volatile UINT16  *Value,\r
  IN      UINT16           CompareValue,\r
  IN      UINT16           ExchangeValue\r
  )\r
{\r
  _asm {\r
    mov     ecx, Value\r
    mov     ax, CompareValue\r
    mov     dx, ExchangeValue\r
    lock    cmpxchg [ecx], dx\r
  }\r
}\r