| 1 | /** @file
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| 2 | FAT format data structures
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| 3 |
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| 4 | Copyright (c) 2006 - 2017, Intel Corporation. All rights reserved.<BR>
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| 5 |
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| 6 | SPDX-License-Identifier: BSD-2-Clause-Patent
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| 7 |
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| 8 | **/
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| 9 |
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| 10 | #ifndef _FAT_FMT_H_
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| 11 | #define _FAT_FMT_H_
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| 12 |
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| 13 | //
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| 14 | // Definitions
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| 15 | //
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| 16 | #define FAT_ATTR_READ_ONLY 0x01
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| 17 | #define FAT_ATTR_HIDDEN 0x02
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| 18 | #define FAT_ATTR_SYSTEM 0x04
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| 19 | #define FAT_ATTR_VOLUME_ID 0x08
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| 20 | #define FAT_ATTR_DIRECTORY 0x10
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| 21 | #define FAT_ATTR_ARCHIVE 0x20
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| 22 | #define FAT_ATTR_LFN (FAT_ATTR_READ_ONLY | FAT_ATTR_HIDDEN | FAT_ATTR_SYSTEM | FAT_ATTR_VOLUME_ID)
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| 23 |
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| 24 | #define FAT_CLUSTER_SPECIAL ((MAX_UINT32 &~0xF) | 0x7)
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| 25 | #define FAT_CLUSTER_FREE 0
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| 26 | #define FAT_CLUSTER_RESERVED (FAT_CLUSTER_SPECIAL)
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| 27 | #define FAT_CLUSTER_BAD (FAT_CLUSTER_SPECIAL)
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| 28 | #define FAT_CLUSTER_LAST (-1)
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| 29 |
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| 30 | #define DELETE_ENTRY_MARK 0xE5
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| 31 | #define EMPTY_ENTRY_MARK 0x00
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| 32 |
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| 33 | #define FAT_CLUSTER_FUNCTIONAL(Cluster) (((Cluster) == 0) || ((Cluster) >= FAT_CLUSTER_SPECIAL))
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| 34 | #define FAT_CLUSTER_END_OF_CHAIN(Cluster) ((Cluster) > (FAT_CLUSTER_SPECIAL))
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| 35 |
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| 36 | //
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| 37 | // Directory Entry
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| 38 | //
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| 39 | #pragma pack(1)
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| 40 |
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| 41 | typedef struct {
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| 42 | UINT16 Day : 5;
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| 43 | UINT16 Month : 4;
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| 44 | UINT16 Year : 7; // From 1980
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| 45 | } FAT_DATE;
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| 46 |
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| 47 | typedef struct {
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| 48 | UINT16 DoubleSecond : 5;
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| 49 | UINT16 Minute : 6;
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| 50 | UINT16 Hour : 5;
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| 51 | } FAT_TIME;
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| 52 |
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| 53 | typedef struct {
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| 54 | FAT_TIME Time;
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| 55 | FAT_DATE Date;
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| 56 | } FAT_DATE_TIME;
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| 57 |
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| 58 | typedef struct {
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| 59 | CHAR8 FileName[11]; // 8.3 filename
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| 60 | UINT8 Attributes;
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| 61 | UINT8 CaseFlag;
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| 62 | UINT8 CreateMillisecond; // (creation milliseconds - ignored)
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| 63 | FAT_DATE_TIME FileCreateTime;
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| 64 | FAT_DATE FileLastAccess;
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| 65 | UINT16 FileClusterHigh; // >= FAT32
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| 66 | FAT_DATE_TIME FileModificationTime;
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| 67 | UINT16 FileCluster;
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| 68 | UINT32 FileSize;
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| 69 | } FAT_DIRECTORY_ENTRY;
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| 70 |
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| 71 | #pragma pack()
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| 72 | //
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| 73 | // Boot Sector
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| 74 | //
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| 75 | #pragma pack(1)
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| 76 |
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| 77 | typedef struct {
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| 78 | UINT8 Ia32Jump[3];
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| 79 | CHAR8 OemId[8];
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| 80 |
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| 81 | UINT16 SectorSize;
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| 82 | UINT8 SectorsPerCluster;
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| 83 | UINT16 ReservedSectors;
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| 84 | UINT8 NoFats;
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| 85 | UINT16 RootEntries; // < FAT32, root dir is fixed size
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| 86 | UINT16 Sectors;
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| 87 | UINT8 Media; // (ignored)
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| 88 | UINT16 SectorsPerFat; // < FAT32
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| 89 | UINT16 SectorsPerTrack; // (ignored)
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| 90 | UINT16 Heads; // (ignored)
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| 91 | UINT32 HiddenSectors; // (ignored)
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| 92 | UINT32 LargeSectors; // => FAT32
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| 93 | UINT8 PhysicalDriveNumber; // (ignored)
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| 94 | UINT8 CurrentHead; // holds boot_sector_dirty bit
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| 95 | UINT8 Signature; // (ignored)
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| 96 | CHAR8 Id[4];
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| 97 | CHAR8 FatLabel[11];
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| 98 | CHAR8 SystemId[8];
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| 99 | } PEI_FAT_BOOT_SECTOR;
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| 100 |
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| 101 | typedef struct {
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| 102 | UINT8 Ia32Jump[3];
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| 103 | CHAR8 OemId[8];
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| 104 |
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| 105 | UINT16 SectorSize;
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| 106 | UINT8 SectorsPerCluster;
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| 107 | UINT16 ReservedSectors;
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| 108 | UINT8 NoFats;
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| 109 | UINT16 RootEntries; // < FAT32, root dir is fixed size
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| 110 | UINT16 Sectors;
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| 111 | UINT8 Media; // (ignored)
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| 112 | UINT16 SectorsPerFat; // < FAT32
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| 113 | UINT16 SectorsPerTrack; // (ignored)
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| 114 | UINT16 Heads; // (ignored)
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| 115 | UINT32 HiddenSectors; // (ignored)
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| 116 | UINT32 LargeSectors; // Used if Sectors==0
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| 117 | UINT32 LargeSectorsPerFat; // FAT32
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| 118 | UINT16 ExtendedFlags; // FAT32 (ignored)
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| 119 | UINT16 FsVersion; // FAT32 (ignored)
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| 120 | UINT32 RootDirFirstCluster; // FAT32
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| 121 | UINT16 FsInfoSector; // FAT32
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| 122 | UINT16 BackupBootSector; // FAT32
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| 123 | UINT8 Reserved[12]; // FAT32 (ignored)
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| 124 | UINT8 PhysicalDriveNumber; // (ignored)
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| 125 | UINT8 CurrentHead; // holds boot_sector_dirty bit
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| 126 | UINT8 Signature; // (ignored)
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| 127 | CHAR8 Id[4];
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| 128 | CHAR8 FatLabel[11];
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| 129 | CHAR8 SystemId[8];
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| 130 | } PEI_FAT_BOOT_SECTOR_EX;
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| 131 |
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| 132 | #pragma pack()
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| 133 |
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| 134 | #endif
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