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Add Kaitai-based parser for Dell DVAR store

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This commit is contained in:
Nikolaj Schlej 2025-04-26 01:14:13 +07:00
parent c8b7151b9e
commit 73d07cddc3
14 changed files with 870 additions and 16 deletions
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38
common/ffs.h
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@ -924,6 +924,44 @@ extern const UByteArray INSYDE_FLASH_MAP_REGION_DXE_FV_GUID;
extern const UByteArray INSYDE_FLASH_MAP_REGION_PEI_FV_GUID;
extern const UByteArray INSYDE_FLASH_MAP_REGION_UNSIGNED_FV_GUID;
//
// Dell variables
//
#define DVAR_STORE_SIGNATURE 0x52415644
typedef struct _DVAR_STORE_HEADER {
UINT32 Signature;
UINT32 StoreSizeC;
UINT8 FlagsC;
// DVAR_ENTRY Entries[];
} DVAR_STORE_HEADER;
typedef struct _DVAR_ENTRY_HEADER {
UINT8 StateC; // Values are stored in 2-complement format, can be converted with (Val = 0xFF - ValC)
UINT8 FlagsC;
UINT8 TypeC;
UINT8 AttributesC;
UINT8 NamespaceIdC;
// The rest is variable depending on Flags and Types
// EFI_GUID NamespaceGuid;
// UINT8 or UINT16 NameId;
// UINT8 or UINT16 DataSize;
// UINT8 Data[DataSize];
} DVAR_ENTRY_HEADER;
#define DVAR_ENTRY_STATE_STORING 0x01
#define DVAR_ENTRY_STATE_STORED 0x05
#define DVAR_ENTRY_STATE_DELETING 0x15
#define DVAR_ENTRY_STATE_DELETED 0x55
//#define DVAR_ENTRY_FLAG_NAME_UTF8 0x01 // Haven't seen any samples yet, so this is a guesswork for now
#define DVAR_ENTRY_FLAG_NAME_ID 0x02
#define DVAR_ENTRY_FLAG_NAMESPACE_GUID 0x04 // This kind of variables is used to store namespace guids, the "deleted" state for them is ignored
#define DVAR_ENTRY_TYPE_NAME_ID_8_DATA_SIZE_8 0x00 // Both NameId and DataSize are UINT8
#define DVAR_ENTRY_TYPE_NAME_ID_16_DATA_SIZE_8 0x04 // NameId is UINT16, DataSize is UINT8
#define DVAR_ENTRY_TYPE_NAME_ID_16_DATA_SIZE_16 0x05 // Both NameId and DataSize are UINT16
// Restore previous packing rules
#pragma pack(pop)