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#ifndef _INC_VARIABLEFORMAT_H
#define _INC_VARIABLEFORMAT_H
///
/// 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_AUTHENTICATED_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 Variable is obsolete.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;
///
/// Associated monotonic count value against replay attack.
///
UINT64 MonotonicCount;
///
/// Associated TimeStamp value against replay attack.
///
EFI_TIME TimeStamp;
///
/// Index of associated public key in database.
///
UINT32 PubKeyIndex;
///
/// 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()
inline BOOLEAN
IsValidVariableHeader (VARIABLE_HEADER *vh) {
if (vh == NULL || vh->StartId != VARIABLE_DATA)
return FALSE;
return TRUE;
}
#endif
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