efifs.h

#ifndef _EFI_FS_H
#define _EFI_FS_H

/*++

Copyright (c)  1999 - 2002 Intel Corporation. All rights reserved
This software and associated documentation (if any) is furnished
under a license and may only be used or copied in accordance
with the terms of the license. Except as permitted by such
license, no part of this software or documentation may be
reproduced, stored in a retrieval system, or transmitted in any
form or by any means without the express written consent of
Intel Corporation.

Module Name:

    efifs.h

Abstract:

    EFI File System structures



Revision History

--*/


//
// EFI Partition header (normally 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