SecurityPkg/VariableAuthenticated/Pei/Variable.h

   1 /** @file
   2   The internal header file includes the common header files, defines
   3   internal structure and functions used by PeiVariable module.
   4
   5 Copyright (c) 2009 - 2011, Intel Corporation. All rights reserved.<BR>
   6 This program and the accompanying materials
   7 are licensed and made available under the terms and conditions of the BSD License
   8 which accompanies this distribution.  The full text of the license may be found at
   9 http://opensource.org/licenses/bsd-license.php
  10
  11 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  12 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  13
  14 **/
  15
  16 #ifndef _PEI_VARIABLE_H_
  17 #define _PEI_VARIABLE_H_
  18
  19 #include <PiPei.h>
  20 #include <Ppi/ReadOnlyVariable2.h>
  21
  22 #include <Library/DebugLib.h>
  23 #include <Library/PeimEntryPoint.h>
  24 #include <Library/HobLib.h>
  25 #include <Library/PcdLib.h>
  26 #include <Library/BaseMemoryLib.h>
  27 #include <Library/PeiServicesTablePointerLib.h>
  28 #include <Library/PeiServicesLib.h>
  29
  30 #include <Guid/AuthenticatedVariableFormat.h>
  31 #include <Guid/VariableIndexTable.h>
  32
  33 typedef enum {
  34   VariableStoreTypeHob,
  35   VariableStoreTypeNv,
  36   VariableStoreTypeMax
  37 } VARIABLE_STORE_TYPE;
  38
  39 //
  40 // Functions
  41 //
  42 /**
  43   Provide the functionality of the variable services.
  44
  45   @param  FileHandle  Handle of the file being invoked.
  46                       Type EFI_PEI_FILE_HANDLE is defined in FfsFindNextFile().
  47   @param  PeiServices  General purpose services available to every PEIM.
  48
  49   @retval EFI_SUCCESS  If the interface could be successfully installed
  50   @retval Others       Returned from PeiServicesInstallPpi()
  51
  52 **/
  53 EFI_STATUS
  54 EFIAPI
  55 PeimInitializeVariableServices (
  56   IN       EFI_PEI_FILE_HANDLE       FileHandle,
  57   IN CONST EFI_PEI_SERVICES          **PeiServices
  58   );
  59
  60 /**
  61   This service retrieves a variable's value using its name and GUID.
  62
  63   Read the specified variable from the UEFI variable store. If the Data
  64   buffer is too small to hold the contents of the variable, the error
  65   EFI_BUFFER_TOO_SMALL is returned and DataSize is set to the required buffer
  66   size to obtain the data.
  67
  68   @param  This                  A pointer to this instance of the EFI_PEI_READ_ONLY_VARIABLE2_PPI.
  69   @param  VariableName          A pointer to a null-terminated string that is the variable's name.
  70   @param  VariableGuid          A pointer to an EFI_GUID that is the variable's GUID. The combination of
  71                                 VariableGuid and VariableName must be unique.
  72   @param  Attributes            If non-NULL, on return, points to the variable's attributes.
  73   @param  DataSize              On entry, points to the size in bytes of the Data buffer.
  74                                 On return, points to the size of the data returned in Data.
  75   @param  Data                  Points to the buffer which will hold the returned variable value.
  76
  77   @retval EFI_SUCCESS           The variable was read successfully.
  78   @retval EFI_NOT_FOUND         The variable could not be found.
  79   @retval EFI_BUFFER_TOO_SMALL  The DataSize is too small for the resulting data.
  80                                 DataSize is updated with the size required for
  81                                 the specified variable.
  82   @retval EFI_INVALID_PARAMETER VariableName, VariableGuid, DataSize or Data is NULL.
  83   @retval EFI_DEVICE_ERROR      The variable could not be retrieved because of a device error.
  84
  85 **/
  86 EFI_STATUS
  87 EFIAPI
  88 PeiGetVariable (
  89   IN CONST  EFI_PEI_READ_ONLY_VARIABLE2_PPI *This,
  90   IN CONST  CHAR16                          *VariableName,
  91   IN CONST  EFI_GUID                        *VariableGuid,
  92   OUT       UINT32                          *Attributes,
  93   IN OUT    UINTN                           *DataSize,
  94   OUT       VOID                            *Data
  95   );
  96
  97 /**
  98   Return the next variable name and GUID.
  99
 100   This function is called multiple times to retrieve the VariableName
 101   and VariableGuid of all variables currently available in the system.
 102   On each call, the previous results are passed into the interface,
 103   and, on return, the interface returns the data for the next
 104   interface. When the entire variable list has been returned,
 105   EFI_NOT_FOUND is returned.
 106
 107   @param  This              A pointer to this instance of the EFI_PEI_READ_ONLY_VARIABLE2_PPI.
 108
 109   @param  VariableNameSize  On entry, points to the size of the buffer pointed to by VariableName.
 110   @param  VariableName      On entry, a pointer to a null-terminated string that is the variable's name.
 111                             On return, points to the next variable's null-terminated name string.
 112
 113   @param  VariableGuid      On entry, a pointer to an UEFI _GUID that is the variable's GUID.
 114                             On return, a pointer to the next variable's GUID.
 115
 116   @retval EFI_SUCCESS           The variable was read successfully.
 117   @retval EFI_NOT_FOUND         The variable could not be found.
 118   @retval EFI_BUFFER_TOO_SMALL  The VariableNameSize is too small for the resulting
 119                                 data. VariableNameSize is updated with the size
 120                                 required for the specified variable.
 121   @retval EFI_INVALID_PARAMETER VariableName, VariableGuid or
 122                                 VariableNameSize is NULL.
 123   @retval EFI_DEVICE_ERROR      The variable could not be retrieved because of a device error.
 124
 125 **/
 126 EFI_STATUS
 127 EFIAPI
 128 PeiGetNextVariableName (
 129   IN CONST  EFI_PEI_READ_ONLY_VARIABLE2_PPI *This,
 130   IN OUT UINTN                              *VariableNameSize,
 131   IN OUT CHAR16                             *VariableName,
 132   IN OUT EFI_GUID                           *VariableGuid
 133   );
 134
 135 #endif