MdeModulePkg/Include/Guid/VariableFormat.h

   1 /** @file
   2   The variable data structures are related to EDK II-specific implementation of UEFI variables.
   3   VariableFormat.h defines variable data headers and variable storage region headers.
   4
   5 Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
   6 This program and the accompanying materials are licensed and made available under
   7 the terms and conditions of the BSD License that accompanies this distribution.
   8 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 __VARIABLE_FORMAT_H__
  17 #define __VARIABLE_FORMAT_H__
  18
  19 #define EFI_VARIABLE_GUID \
  20   { 0xddcf3616, 0x3275, 0x4164, { 0x98, 0xb6, 0xfe, 0x85, 0x70, 0x7f, 0xfe, 0x7d } }
  21
  22 extern EFI_GUID gEfiVariableGuid;
  23
  24 ///
  25 /// Alignment of variable name and data, according to the architecture:
  26 /// * For IA-32 and Intel(R) 64 architectures: 1.
  27 /// * For IA-64 architecture: 8.
  28 ///
  29 #if defined (MDE_CPU_IPF)
  30 #define ALIGNMENT         8
  31 #else
  32 #define ALIGNMENT         1
  33 #endif
  34
  35 //
  36 // GET_PAD_SIZE calculates the miminal pad bytes needed to make the current pad size satisfy the alignment requirement.
  37 //
  38 #if (ALIGNMENT == 1)
  39 #define GET_PAD_SIZE(a) (0)
  40 #else
  41 #define GET_PAD_SIZE(a) (((~a) + 1) & (ALIGNMENT - 1))
  42 #endif
  43
  44 ///
  45 /// Alignment of Variable Data Header in Variable Store region.
  46 ///
  47 #define HEADER_ALIGNMENT  4
  48 #define HEADER_ALIGN(Header)  (((UINTN) (Header) + HEADER_ALIGNMENT - 1) & (~(HEADER_ALIGNMENT - 1)))
  49
  50 ///
  51 /// Status of Variable Store Region.
  52 ///
  53 typedef enum {
  54   EfiRaw,
  55   EfiValid,
  56   EfiInvalid,
  57   EfiUnknown
  58 } VARIABLE_STORE_STATUS;
  59
  60 #pragma pack(1)
  61
  62 #define VARIABLE_STORE_SIGNATURE  EFI_VARIABLE_GUID
  63
  64 ///
  65 /// Variable Store Header Format and State.
  66 ///
  67 #define VARIABLE_STORE_FORMATTED          0x5a
  68 #define VARIABLE_STORE_HEALTHY            0xfe
  69
  70 ///
  71 /// Variable Store region header.
  72 ///
  73 typedef struct {
  74   ///
  75   /// Variable store region signature.
  76   ///
  77   EFI_GUID  Signature;
  78   ///
  79   /// Size of entire variable store,
  80   /// including size of variable store header but not including the size of FvHeader.
  81   ///
  82   UINT32  Size;
  83   ///
  84   /// Variable region format state.
  85   ///
  86   UINT8   Format;
  87   ///
  88   /// Variable region healthy state.
  89   ///
  90   UINT8   State;
  91   UINT16  Reserved;
  92   UINT32  Reserved1;
  93 } VARIABLE_STORE_HEADER;
  94
  95 ///
  96 /// Variable data start flag.
  97 ///
  98 #define VARIABLE_DATA                     0x55AA
  99
 100 ///
 101 /// Variable State flags.
 102 ///
 103 #define VAR_IN_DELETED_TRANSITION     0xfe  ///< Variable is in obsolete transition.
 104 #define VAR_DELETED                   0xfd  ///< Variable is obsolete.
 105 #define VAR_HEADER_VALID_ONLY         0x7f  ///< Variable header has been valid.
 106 #define VAR_ADDED                     0x3f  ///< Variable has been completely added.
 107
 108 ///
 109 /// Single Variable Data Header Structure.
 110 ///
 111 typedef struct {
 112   ///
 113   /// Variable Data Start Flag.
 114   ///
 115   UINT16      StartId;
 116   ///
 117   /// Variable State defined above.
 118   ///
 119   UINT8       State;
 120   UINT8       Reserved;
 121   ///
 122   /// Attributes of variable defined in UEFI specification.
 123   ///
 124   UINT32      Attributes;
 125   ///
 126   /// Size of variable null-terminated Unicode string name.
 127   ///
 128   UINT32      NameSize;
 129   ///
 130   /// Size of the variable data without this header.
 131   ///
 132   UINT32      DataSize;
 133   ///
 134   /// A unique identifier for the vendor that produces and consumes this varaible.
 135   ///
 136   EFI_GUID    VendorGuid;
 137 } VARIABLE_HEADER;
 138
 139 #pragma pack()
 140
 141 typedef struct _VARIABLE_INFO_ENTRY  VARIABLE_INFO_ENTRY;
 142
 143 ///
 144 /// This structure contains the variable list that is put in EFI system table.
 145 /// The variable driver collects all variables that were used at boot service time and produces this list.
 146 /// This is an optional feature to dump all used variables in shell environment.
 147 ///
 148 struct _VARIABLE_INFO_ENTRY {
 149   VARIABLE_INFO_ENTRY *Next;       ///< Pointer to next entry.
 150   EFI_GUID            VendorGuid;  ///< Guid of Variable.
 151   CHAR16              *Name;       ///< Name of Variable.
 152   UINT32              Attributes;  ///< Attributes of variable defined in UEFI specification.
 153   UINT32              ReadCount;   ///< Number of times to read this variable.
 154   UINT32              WriteCount;  ///< Number of times to write this variable.
 155   UINT32              DeleteCount; ///< Number of times to delete this variable.
 156   UINT32              CacheCount;  ///< Number of times that cache hits this variable.
 157   BOOLEAN             Volatile;    ///< TRUE if volatile, FALSE if non-volatile.
 158 };
 159
 160 #endif // _EFI_VARIABLE_H_