MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLibInternals.h

   1 /** @file
   2   Declaration of internal functions in BaseSynchronizationLib.
   3
   4   Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>
   5   This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php.
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #ifndef __BASE_SYNCHRONIZATION_LIB_INTERNALS__
  16 #define __BASE_SYNCHRONIZATION_LIB_INTERNALS__
  17
  18 #include <Base.h>
  19 #include <Library/SynchronizationLib.h>
  20 #include <Library/BaseLib.h>
  21 #include <Library/DebugLib.h>
  22 #include <Library/TimerLib.h>
  23 #include <Library/PcdLib.h>
  24
  25 /**
  26   Performs an atomic increment of an 32-bit unsigned integer.
  27
  28   Performs an atomic increment of the 32-bit unsigned integer specified by
  29   Value and returns the incremented value. The increment operation must be
  30   performed using MP safe mechanisms. The state of the return value is not
  31   guaranteed to be MP safe.
  32
  33   @param  Value A pointer to the 32-bit value to increment.
  34
  35   @return The incremented value.
  36
  37 **/
  38 UINT32
  39 EFIAPI
  40 InternalSyncIncrement (
  41   IN      volatile UINT32           *Value
  42   );
  43
  44
  45 /**
  46   Performs an atomic decrement of an 32-bit unsigned integer.
  47
  48   Performs an atomic decrement of the 32-bit unsigned integer specified by
  49   Value and returns the decrement value. The decrement operation must be
  50   performed using MP safe mechanisms. The state of the return value is not
  51   guaranteed to be MP safe.
  52
  53   @param  Value A pointer to the 32-bit value to decrement.
  54
  55   @return The decrement value.
  56
  57 **/
  58 UINT32
  59 EFIAPI
  60 InternalSyncDecrement (
  61   IN      volatile UINT32           *Value
  62   );
  63
  64
  65 /**
  66   Performs an atomic compare exchange operation on a 16-bit unsigned integer.
  67
  68   Performs an atomic compare exchange operation on the 16-bit unsigned integer
  69   specified by Value.  If Value is equal to CompareValue, then Value is set to
  70   ExchangeValue and CompareValue is returned.  If Value is not equal to CompareValue,
  71   then Value is returned.  The compare exchange operation must be performed using
  72   MP safe mechanisms.
  73
  74   @param  Value         A pointer to the 16-bit value for the compare exchange
  75                         operation.
  76   @param  CompareValue  A 16-bit value used in compare operation.
  77   @param  ExchangeValue A 16-bit value used in exchange operation.
  78
  79   @return The original *Value before exchange.
  80
  81 **/
  82 UINT16
  83 EFIAPI
  84 InternalSyncCompareExchange16 (
  85   IN      volatile UINT16           *Value,
  86   IN      UINT16                    CompareValue,
  87   IN      UINT16                    ExchangeValue
  88   );
  89
  90
  91 /**
  92   Performs an atomic compare exchange operation on a 32-bit unsigned integer.
  93
  94   Performs an atomic compare exchange operation on the 32-bit unsigned integer
  95   specified by Value.  If Value is equal to CompareValue, then Value is set to
  96   ExchangeValue and CompareValue is returned.  If Value is not equal to CompareValue,
  97   then Value is returned.  The compare exchange operation must be performed using
  98   MP safe mechanisms.
  99
 100   @param  Value         A pointer to the 32-bit value for the compare exchange
 101                         operation.
 102   @param  CompareValue  A 32-bit value used in compare operation.
 103   @param  ExchangeValue A 32-bit value used in exchange operation.
 104
 105   @return The original *Value before exchange.
 106
 107 **/
 108 UINT32
 109 EFIAPI
 110 InternalSyncCompareExchange32 (
 111   IN      volatile UINT32           *Value,
 112   IN      UINT32                    CompareValue,
 113   IN      UINT32                    ExchangeValue
 114   );
 115
 116
 117 /**
 118   Performs an atomic compare exchange operation on a 64-bit unsigned integer.
 119
 120   Performs an atomic compare exchange operation on the 64-bit unsigned integer specified
 121   by Value.  If Value is equal to CompareValue, then Value is set to ExchangeValue and
 122   CompareValue is returned.  If Value is not equal to CompareValue, then Value is returned.
 123   The compare exchange operation must be performed using MP safe mechanisms.
 124
 125   @param  Value         A pointer to the 64-bit value for the compare exchange
 126                         operation.
 127   @param  CompareValue  A 64-bit value used in compare operation.
 128   @param  ExchangeValue A 64-bit value used in exchange operation.
 129
 130   @return The original *Value before exchange.
 131
 132 **/
 133 UINT64
 134 EFIAPI
 135 InternalSyncCompareExchange64 (
 136   IN      volatile UINT64           *Value,
 137   IN      UINT64                    CompareValue,
 138   IN      UINT64                    ExchangeValue
 139   );
 140
 141 /**
 142   Internal function to retrieve the architecture specific spin lock alignment
 143   requirements for optimal spin lock performance.
 144
 145   @return The architecture specific spin lock alignment.
 146
 147 **/
 148 UINTN
 149 InternalGetSpinLockProperties (
 150   VOID
 151   );
 152
 153 #endif