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/** @file
The header of Variable.c.
Copyright (c) 2011-2019, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#ifndef __VARIABLE_FORMAT_H__
#define __VARIABLE_FORMAT_H__
#define EFI_VARIABLE_GUID \
{ 0xddcf3616, 0x3275, 0x4164, { 0x98, 0xb6, 0xfe, 0x85, 0x70, 0x7f, 0xfe, 0x7d } }
extern EFI_GUID gEfiVariableGuid;
///
/// Alignment of variable name and data, according to the architecture:
/// * For IA-32 and Intel(R) 64 architectures: 1.
/// * For IA-64 architecture: 8.
///
#if defined (MDE_CPU_IPF)
#define ALIGNMENT 8
#else
#define ALIGNMENT 1
#endif
///
/// GET_PAD_SIZE calculates the miminal pad bytes needed to make the current pad size satisfy the alignment requirement.
///
#if (ALIGNMENT == 1)
#define GET_PAD_SIZE(a) (0)
#else
#define GET_PAD_SIZE(a) (((~a) + 1) & (ALIGNMENT - 1))
#endif
///
/// Alignment of Variable Data Header in Variable Store region.
///
#define HEADER_ALIGNMENT 4
#define HEADER_ALIGN(Header) (((UINTN) (Header) + HEADER_ALIGNMENT - 1) & (~(HEADER_ALIGNMENT - 1)))
///
/// Status of Variable Store Region.
///
typedef enum {
EfiRaw,
EfiValid,
EfiInvalid,
EfiUnknown
} VARIABLE_STORE_STATUS;
#pragma pack(1)
#define VARIABLE_STORE_SIGNATURE EFI_VARIABLE_GUID
///
/// Variable Store Header Format and State.
///
#define VARIABLE_STORE_FORMATTED 0x5a
#define VARIABLE_STORE_HEALTHY 0xfe
///
/// Variable Store region header.
///
typedef struct {
///
/// Variable store region signature.
///
EFI_GUID Signature;
///
/// Size of entire variable store,
/// including size of variable store header but not including the size of FvHeader.
///
UINT32 Size;
///
/// Variable region format state.
///
UINT8 Format;
///
/// Variable region healthy state.
///
UINT8 State;
UINT16 Reserved;
UINT32 Reserved1;
} VARIABLE_STORE_HEADER;
///
/// Variable data start flag.
///
#define VARIABLE_DATA 0x55AA
///
/// Variable State flags.
///
#define VAR_IN_DELETED_TRANSITION 0xfe ///< Variable is in obsolete transition.
#define VAR_DELETED 0xfd ///< Variable is obsolete.
#define VAR_HEADER_VALID_ONLY 0x7f ///< Variable header has been valid.
#define VAR_ADDED 0x3f ///< Variable has been completely added.
///
/// Single Variable Data Header Structure.
///
typedef struct {
///
/// Variable Data Start Flag.
///
UINT16 StartId;
///
/// Variable State defined above.
///
UINT8 State;
UINT8 Reserved;
///
/// Attributes of variable defined in UEFI specification.
///
UINT32 Attributes;
///
/// Size of variable null-terminated Unicode string name.
///
UINT32 NameSize;
///
/// Size of the variable data without this header.
///
UINT32 DataSize;
///
/// A unique identifier for the vendor that produces and consumes this varaible.
///
EFI_GUID VendorGuid;
} VARIABLE_HEADER;
#pragma pack()
typedef struct _VARIABLE_INFO_ENTRY VARIABLE_INFO_ENTRY;
///
/// This structure contains the variable list that is put in EFI system table.
/// The variable driver collects all variables that were used at boot service time and produces this list.
/// This is an optional feature to dump all used variables in shell environment.
///
struct _VARIABLE_INFO_ENTRY {
VARIABLE_INFO_ENTRY *Next; ///< Pointer to next entry.
EFI_GUID VendorGuid; ///< Guid of Variable.
CHAR16 *Name; ///< Name of Variable.
UINT32 Attributes; ///< Attributes of variable defined in UEFI specification.
UINT32 ReadCount; ///< Number of times to read this variable.
UINT32 WriteCount; ///< Number of times to write this variable.
UINT32 DeleteCount; ///< Number of times to delete this variable.
UINT32 CacheCount; ///< Number of times that cache hits this variable.
BOOLEAN Volatile; ///< TRUE if volatile, FALSE if non-volatile.
};
#endif // _EFI_VARIABLE_H_
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