FatPkg/FatPei/FatLiteFmt.h

/** @file
  FAT format data structures

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

This program and the accompanying materials are licensed and made available
under the terms and conditions of the BSD License which accompanies this
distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php

THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#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