MdeModulePkg/Universal/VariablePei/VariableWorker.c

   1 /*++
   2
   3 Copyright (c) 2007, Intel Corporation
   4 All rights reserved. This program and the accompanying materials
   5 are licensed and made available under the terms and conditions of the BSD License
   6 which accompanies this distribution.  The full text of the license may be found at
   7 http://opensource.org/licenses/bsd-license.php
   8
   9 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11
  12 Module Name:
  13
  14   VariableWorker.c
  15
  16 Abstract:
  17
  18   Framework PEIM to provide the Variable functionality
  19
  20 --*/
  21 //
  22 // The package level header files this module uses
  23 //
  24 #include <PiPei.h>
  25
  26 //
  27 // The protocols, PPI and GUID defintions for this module
  28 //
  29 #include <Ppi/ReadOnlyVariable.h>
  30 //
  31 // The Library classes this module consumes
  32 //
  33 #include <Library/DebugLib.h>
  34 #include <Library/PeimEntryPoint.h>
  35 #include <Library/HobLib.h>
  36 #include <Library/PcdLib.h>
  37 #include <Library/BaseMemoryLib.h>
  38
  39
  40 #include <Variable.h>
  41
  42 /**
  43   Get one variable by the index count.
  44
  45   @param  IndexTable  The pointer to variable index table.
  46   @param  Count       The index count of variable in index table.
  47
  48   @return The pointer to variable header indexed by count.
  49
  50 **/
  51 VARIABLE_HEADER *
  52 GetVariableByIndex (
  53   IN VARIABLE_INDEX_TABLE        *IndexTable,
  54   IN UINT32                      Count
  55   )
  56 {
  57   return (VARIABLE_HEADER *) (UINTN) (IndexTable->Index[Count] + ((UINTN) IndexTable->StartPtr & 0xFFFF0000));
  58 }
  59
  60 /**
  61   Record Variable in VariableIndex HOB.
  62
  63   Record Variable in VariableIndex HOB and update the length of variable index table.
  64
  65   @param  IndexTable  The pointer to variable index table.
  66   @param  Variable    The pointer to the variable that will be recorded.
  67
  68   @retval VOID
  69
  70 **/
  71 VOID
  72 VariableIndexTableUpdate (
  73   IN OUT  VARIABLE_INDEX_TABLE   *IndexTable,
  74   IN      VARIABLE_HEADER        *Variable
  75   )
  76 {
  77   IndexTable->Index[IndexTable->Length++] = (UINT16) (UINTN) Variable;
  78
  79   return;
  80 }
  81