windows-xp/Source/XPSP1/NT/base/ntos/inc/efifs.h

#ifndef _EFI_FS_H
#define _EFI_FS_H

/*++

Copyright (c) 1998  Intel Corporation

Module Name:

    efifs.h

Abstract:

    EFI File System structures



Revision History

--*/


/* 
 *  EFI Partition header (normaly starts in LBA 1)
 */

#define EFI_PARTITION_SIGNATURE         0x5053595320494249
#define EFI_PARTITION_REVISION          0x00010001
#define MIN_EFI_PARTITION_BLOCK_SIZE    512
#define EFI_PARTITION_LBA               1

typedef struct _EFI_PARTITION_HEADER {
    EFI_TABLE_HEADER    Hdr;
    UINT32              DirectoryAllocationNumber;
    UINT32              BlockSize;
    EFI_LBA             FirstUsableLba;
    EFI_LBA             LastUsableLba;
    EFI_LBA             UnusableSpace;
    EFI_LBA             FreeSpace;
    EFI_LBA             RootFile;
    EFI_LBA             SecutiryFile;
} EFI_PARTITION_HEADER;


/* 
 *  File header
 */

#define EFI_FILE_HEADER_SIGNATURE   0x454c494620494249
#define EFI_FILE_HEADER_REVISION    0x00010000
#define EFI_FILE_STRING_SIZE        260

typedef struct _EFI_FILE_HEADER {
    EFI_TABLE_HEADER    Hdr;
    UINT32              Class;
    UINT32              LBALOffset;
    EFI_LBA             Parent;
    UINT64              FileSize;
    UINT64              FileAttributes;
    EFI_TIME            FileCreateTime;
    EFI_TIME            FileModificationTime;
    EFI_GUID            VendorGuid;
    CHAR16              FileString[EFI_FILE_STRING_SIZE];
} EFI_FILE_HEADER;


/* 
 *  Return the file's first LBAL which is in the same
 *  logical block as the file header
 */

#define EFI_FILE_LBAL(a)    ((EFI_LBAL *) (((CHAR8 *) (a)) + (a)->LBALOffset))

#define EFI_FILE_CLASS_FREE_SPACE   1
#define EFI_FILE_CLASS_EMPTY        2
#define EFI_FILE_CLASS_NORMAL       3


/* 
 *  Logical Block Address List - the fundemental block
 *  description structure
 */

#define EFI_LBAL_SIGNATURE      0x4c41424c20494249
#define EFI_LBAL_REVISION       0x00010000

typedef struct _EFI_LBAL {
    EFI_TABLE_HEADER    Hdr;
    UINT32              Class;
    EFI_LBA             Parent;
    EFI_LBA             Next;
    UINT32              ArraySize;
    UINT32              ArrayCount;
} EFI_LBAL;

/*  Array size  */
#define EFI_LBAL_ARRAY_SIZE(lbal,offs,blks)  \
        (((blks) - (offs) - (lbal)->Hdr.HeaderSize) / sizeof(EFI_RL))

/* 
 *  Logical Block run-length
 */

typedef struct {
    EFI_LBA     Start;
    UINT64      Length;
} EFI_RL;

/* 
 *  Return the run-length structure from an LBAL header
 */

#define EFI_LBAL_RL(a)      ((EFI_RL*) (((CHAR8 *) (a)) + (a)->Hdr.HeaderSize))

#endif