MdeModulePkg/Universal/Variable/Pei/Ipf/VariableWorker.c

   1 /** @file
   2   Variable worker functions.
   3
   4   Copyright (c) 2006, Intel Corporation<BR>
   5   All rights reserved. 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 #include <Variable.h>
  16
  17
  18 /**
  19   Get one variable by the index count.
  20
  21   @param  IndexTable  The pointer to variable index table.
  22   @param  Count       The index count of variable in index table.
  23
  24   @return The pointer to variable header indexed by count.
  25
  26 **/
  27 VARIABLE_HEADER *
  28 GetVariableByIndex (
  29   IN VARIABLE_INDEX_TABLE        *IndexTable,
  30   IN UINT32                      Count
  31   )
  32 {
  33   return (VARIABLE_HEADER *) (UINTN) ((((UINT32)IndexTable->Index[Count]) << 2) + ((UINT32)(UINTN)IndexTable->StartPtr & 0xFFFC0000) );
  34 }
  35
  36 /**
  37   Record Variable in VariableIndex HOB.
  38
  39   Record Variable in VariableIndex HOB and update the length of variable index table.
  40
  41   @param  IndexTable  The pointer to variable index table.
  42   @param  Variable    The pointer to the variable that will be recorded.
  43
  44   @retval VOID
  45
  46 **/
  47 VOID
  48 VariableIndexTableUpdate (
  49   IN OUT  VARIABLE_INDEX_TABLE   *IndexTable,
  50   IN      VARIABLE_HEADER        *Variable
  51   )
  52 {
  53   IndexTable->Index[IndexTable->Length++] = (UINT16) (((UINT32)(UINTN) Variable) >> 2);
  54
  55   return;
  56 }
  57