FatPkg/FatPei/FatLiteFmt.h

/** @file
  FAT format data structures

Copyright (c) 2006 - 2017, Intel Corporation. All rights reserved.<BR>

SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#ifndef _FAT_FMT_H_
#define _FAT_FMT_H_

//
// Definitions
//
#define FAT_ATTR_READ_ONLY  0x01
#define FAT_ATTR_HIDDEN     0x02
#define FAT_ATTR_SYSTEM     0x04
#define FAT_ATTR_VOLUME_ID  0x08
#define FAT_ATTR_DIRECTORY  0x10
#define FAT_ATTR_ARCHIVE    0x20
#define FAT_ATTR_LFN        (FAT_ATTR_READ_ONLY | FAT_ATTR_HIDDEN | FAT_ATTR_SYSTEM | FAT_ATTR_VOLUME_ID)

#define FAT_CLUSTER_SPECIAL   ((MAX_UINT32 &~0xF) | 0x7)
#define FAT_CLUSTER_FREE      0
#define FAT_CLUSTER_RESERVED  (FAT_CLUSTER_SPECIAL)
#define FAT_CLUSTER_BAD       (FAT_CLUSTER_SPECIAL)
#define FAT_CLUSTER_LAST      (-1)

#define DELETE_ENTRY_MARK  0xE5
#define EMPTY_ENTRY_MARK   0x00

#define FAT_CLUSTER_FUNCTIONAL(Cluster)    (((Cluster) == 0) || ((Cluster) >= FAT_CLUSTER_SPECIAL))
#define FAT_CLUSTER_END_OF_CHAIN(Cluster)  ((Cluster) > (FAT_CLUSTER_SPECIAL))

//
// Directory Entry
//
#pragma pack(1)

typedef struct {
  UINT16    Day   : 5;
  UINT16    Month : 4;
  UINT16    Year  : 7;              // From 1980
} FAT_DATE;

typedef struct {
  UINT16    DoubleSecond : 5;
  UINT16    Minute       : 6;
  UINT16    Hour         : 5;
} FAT_TIME;

typedef struct {
  FAT_TIME    Time;
  FAT_DATE    Date;
} FAT_DATE_TIME;

typedef struct {
  CHAR8            FileName[11];    // 8.3 filename
  UINT8            Attributes;
  UINT8            CaseFlag;
  UINT8            CreateMillisecond; // (creation milliseconds - ignored)
  FAT_DATE_TIME    FileCreateTime;
  FAT_DATE         FileLastAccess;
  UINT16           FileClusterHigh; // >= FAT32
  FAT_DATE_TIME    FileModificationTime;
  UINT16           FileCluster;
  UINT32           FileSize;
} FAT_DIRECTORY_ENTRY;

#pragma pack()
//
// Boot Sector
//
#pragma pack(1)

typedef struct {
  UINT8     Ia32Jump[3];
  CHAR8     OemId[8];

  UINT16    SectorSize;
  UINT8     SectorsPerCluster;
  UINT16    ReservedSectors;
  UINT8     NoFats;
  UINT16    RootEntries;        // < FAT32, root dir is fixed size
  UINT16    Sectors;
  UINT8     Media;               // (ignored)
  UINT16    SectorsPerFat;       // < FAT32
  UINT16    SectorsPerTrack;     // (ignored)
  UINT16    Heads;               // (ignored)
  UINT32    HiddenSectors;       // (ignored)
  UINT32    LargeSectors;        // => FAT32
  UINT8     PhysicalDriveNumber; // (ignored)
  UINT8     CurrentHead;         // holds boot_sector_dirty bit
  UINT8     Signature;           // (ignored)
  CHAR8     Id[4];
  CHAR8     FatLabel[11];
  CHAR8     SystemId[8];
} PEI_FAT_BOOT_SECTOR;

typedef struct {
  UINT8     Ia32Jump[3];
  CHAR8     OemId[8];

  UINT16    SectorSize;
  UINT8     SectorsPerCluster;
  UINT16    ReservedSectors;
  UINT8     NoFats;
  UINT16    RootEntries;        // < FAT32, root dir is fixed size
  UINT16    Sectors;
  UINT8     Media;               // (ignored)
  UINT16    SectorsPerFat;       // < FAT32
  UINT16    SectorsPerTrack;     // (ignored)
  UINT16    Heads;               // (ignored)
  UINT32    HiddenSectors;       // (ignored)
  UINT32    LargeSectors;        // Used if Sectors==0
  UINT32    LargeSectorsPerFat;  // FAT32
  UINT16    ExtendedFlags;       // FAT32 (ignored)
  UINT16    FsVersion;           // FAT32 (ignored)
  UINT32    RootDirFirstCluster; // FAT32
  UINT16    FsInfoSector;        // FAT32
  UINT16    BackupBootSector;    // FAT32
  UINT8     Reserved[12];        // FAT32 (ignored)
  UINT8     PhysicalDriveNumber; // (ignored)
  UINT8     CurrentHead;         // holds boot_sector_dirty bit
  UINT8     Signature;           // (ignored)
  CHAR8     Id[4];
  CHAR8     FatLabel[11];
  CHAR8     SystemId[8];
} PEI_FAT_BOOT_SECTOR_EX;

#pragma pack()

#endif