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[mirror_edk2.git] / MdePkg / Library / BaseSynchronizationLib / Ebc / Synchronization.c

/** @file\r
  Implementation of synchronization functions on EBC.\r
\r
  Copyright (c) 2006 - 2018, Intel Corporation. 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\r
  unsigned integer.\r
\r
  Performs an atomic compare exchange operation on the 16-bit\r
  unsigned integer specified by Value.  If Value is equal to\r
  CompareValue, then Value is set to ExchangeValue and\r
  CompareValue is returned.  If Value is not equal to\r
  CompareValue, then Value is returned. The compare exchange\r
  operation must be performed using MP safe mechanisms.\r
\r
  @param  Value         A pointer to the 16-bit value for the\r
                        compare exchange 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
  return *Value != CompareValue ? *Value :\r
         ((*Value = ExchangeValue), CompareValue);\r
}\r
\r
/**\r
  Performs an atomic compare exchange operation on a 32-bit\r
  unsigned integer.\r
\r
  Performs an atomic compare exchange operation on the 32-bit\r
  unsigned integer specified by Value.  If Value is equal to\r
  CompareValue, then Value is set to ExchangeValue and\r
  CompareValue is returned.  If Value is not equal to\r
  CompareValue, then Value is returned. The compare exchange\r
  operation must be performed using MP safe mechanisms.\r
\r
  @param  Value         A pointer to the 32-bit value for the\r
                        compare exchange operation.\r
  @param  CompareValue  32-bit value used in compare operation.\r
  @param  ExchangeValue 32-bit value used in exchange operation.\r
\r
  @return The original *Value before exchange.\r
\r
**/\r
UINT32\r
EFIAPI\r
InternalSyncCompareExchange32 (\r
  IN      volatile UINT32  *Value,\r
  IN      UINT32           CompareValue,\r
  IN      UINT32           ExchangeValue\r
  )\r
{\r
  return *Value != CompareValue ? *Value :\r
         ((*Value = ExchangeValue), CompareValue);\r
}\r
\r
/**\r
  Performs an atomic compare exchange operation on a 64-bit unsigned integer.\r
\r
  Performs an atomic compare exchange operation on the 64-bit unsigned integer specified\r
  by Value.  If Value is equal to CompareValue, then Value is set to ExchangeValue and\r
  CompareValue is returned.  If Value is not equal to CompareValue, then Value is returned.\r
  The compare exchange operation must be performed using MP safe mechanisms.\r
\r
  @param  Value         A pointer to the 64-bit value for the compare exchange\r
                        operation.\r
  @param  CompareValue  64-bit value used in compare operation.\r
  @param  ExchangeValue 64-bit value used in exchange operation.\r
\r
  @return The original *Value before exchange.\r
\r
**/\r
UINT64\r
EFIAPI\r
InternalSyncCompareExchange64 (\r
  IN      volatile UINT64  *Value,\r
  IN      UINT64           CompareValue,\r
  IN      UINT64           ExchangeValue\r
  )\r
{\r
  return *Value != CompareValue ? *Value :\r
         ((*Value = ExchangeValue), CompareValue);\r
}\r
\r
/**\r
  Performs an atomic increment of an 32-bit unsigned integer.\r
\r
  Performs an atomic increment of the 32-bit unsigned integer specified by\r
  Value and returns the incremented value. The increment operation must be\r
  performed using MP safe mechanisms. The state of the return value is not\r
  guaranteed to be MP safe.\r
\r
  @param  Value A pointer to the 32-bit value to increment.\r
\r
  @return The incremented value.\r
\r
**/\r
UINT32\r
EFIAPI\r
InternalSyncIncrement (\r
  IN      volatile UINT32  *Value\r
  )\r
{\r
  return ++*Value;\r
}\r
\r
/**\r
  Performs an atomic decrement of an 32-bit unsigned integer.\r
\r
  Performs an atomic decrement of the 32-bit unsigned integer specified by\r
  Value and returns the decrement value. The decrement operation must be\r
  performed using MP safe mechanisms. The state of the return value is not\r
  guaranteed to be MP safe.\r
\r
  @param  Value A pointer to the 32-bit value to decrement.\r
\r
  @return The decrement value.\r
\r
**/\r
UINT32\r
EFIAPI\r
InternalSyncDecrement (\r
  IN      volatile UINT32  *Value\r
  )\r
{\r
  return --*Value;\r
}\r