MdeModulePkg/Universal/VariablePei/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 // The package level header files this module uses
  16 //
  17 #include <PiPei.h>
  18
  19 //
  20 // The protocols, PPI and GUID defintions for this module
  21 //
  22 #include <Ppi/ReadOnlyVariable.h>
  23 //
  24 // The Library classes this module consumes
  25 //
  26 #include <Library/DebugLib.h>
  27 #include <Library/PeimEntryPoint.h>
  28 #include <Library/HobLib.h>
  29 #include <Library/PcdLib.h>
  30 #include <Library/BaseMemoryLib.h>
  31
  32 #include <Variable.h>
  33
  34
  35 /**
  36   Get one variable by the index count.
  37
  38   @param  IndexTable  The pointer to variable index table.
  39   @param  Count       The index count of variable in index table.
  40
  41   @return The pointer to variable header indexed by count.
  42
  43 **/
  44 VARIABLE_HEADER *
  45 GetVariableByIndex (
  46   IN VARIABLE_INDEX_TABLE        *IndexTable,
  47   IN UINT32                      Count
  48   )
  49 {
  50   return (VARIABLE_HEADER *) (UINTN) ((((UINT32)IndexTable->Index[Count]) << 2) + ((UINT32)(UINTN)IndexTable->StartPtr & 0xFFFC0000) );
  51 }
  52
  53 /**
  54   Record Variable in VariableIndex HOB.
  55
  56   Record Variable in VariableIndex HOB and update the length of variable index table.
  57
  58   @param  IndexTable  The pointer to variable index table.
  59   @param  Variable    The pointer to the variable that will be recorded.
  60
  61   @retval VOID
  62
  63 **/
  64 VOID
  65 VariableIndexTableUpdate (
  66   IN OUT  VARIABLE_INDEX_TABLE   *IndexTable,
  67   IN      VARIABLE_HEADER        *Variable
  68   )
  69 {
  70   IndexTable->Index[IndexTable->Length++] = (UINT16) (((UINT32)(UINTN) Variable) >> 2);
  71
  72   return;
  73 }
  74