1 /** @file 2 3 Fat file system structure and definition. 4 5 Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR> 6 This program and the accompanying materials 7 are licensed and made available under the terms and conditions of the BSD License 8 which accompanies this distribution. The full text of the license may be found at 9 http://opensource.org/licenses/bsd-license.php 10 11 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 12 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 13 14 **/ 15 16 #ifndef _FAT_BPB_H_ 17 #define _FAT_BPB_H_ 18 19 #include "CommonLib.h" 20 21 #pragma pack(1) 22 23 typedef struct { 24 // 25 // Fat common field 26 // 27 UINT8 BS_jmpBoot[3]; 28 CHAR8 BS_OEMName[8]; 29 UINT16 BPB_BytsPerSec; 30 UINT8 BPB_SecPerClus; 31 UINT16 BPB_RsvdSecCnt; 32 UINT8 BPB_NumFATs; 33 UINT16 BPB_RootEntCnt; 34 UINT16 BPB_TotSec16; 35 UINT8 BPB_Media; 36 UINT16 BPB_FATSz16; 37 UINT16 BPB_SecPerTrk; 38 UINT16 BPB_NumHeads; 39 UINT32 BPB_HiddSec; 40 UINT32 BPB_TotSec32; 41 42 // 43 // Fat12/16 specific field 44 // 45 UINT8 BS_DrvNum; 46 UINT8 BS_Reserved1; 47 UINT8 BS_BootSig; 48 UINT32 BS_VolID; 49 CHAR8 BS_VolLab[11]; 50 CHAR8 BS_FilSysType[8]; 51 52 // 53 // Boot Code and Data 54 // 55 UINT8 Reserved[448]; 56 57 // 58 // Fat common signature - 0xAA55 59 // 60 UINT16 Signature; 61 } FAT12_16_BPB_STRUCT; 62 63 typedef struct { 64 // 65 // Fat common field 66 // 67 UINT8 BS_jmpBoot[3]; 68 CHAR8 BS_OEMName[8]; 69 UINT16 BPB_BytsPerSec; 70 UINT8 BPB_SecPerClus; 71 UINT16 BPB_RsvdSecCnt; 72 UINT8 BPB_NumFATs; 73 UINT16 BPB_RootEntCnt; 74 UINT16 BPB_TotSec16; 75 UINT8 BPB_Media; 76 UINT16 BPB_FATSz16; 77 UINT16 BPB_SecPerTrk; 78 UINT16 BPB_NumHeads; 79 UINT32 BPB_HiddSec; 80 UINT32 BPB_TotSec32; 81 82 // 83 // Fat32 specific field 84 // 85 UINT32 BPB_FATSz32; 86 UINT16 BPB_ExtFlags; 87 UINT16 BPB_FSVer; 88 UINT32 BPB_RootClus; 89 UINT16 BPB_FSInfo; 90 UINT16 BPB_BkBootSec; 91 UINT8 BPB_Reserved[12]; 92 UINT8 BS_DrvNum; 93 UINT8 BS_Reserved1; 94 UINT8 BS_BootSig; 95 UINT32 BS_VolID; 96 CHAR8 BS_VolLab[11]; 97 CHAR8 BS_FilSysType[8]; 98 99 // 100 // Boot Code and Data 101 // 102 UINT8 Reserved[420]; 103 104 // 105 // Fat common signature - 0xAA55 106 // 107 UINT16 Signature; 108 } FAT32_BPB_STRUCT; 109 110 typedef union { 111 FAT12_16_BPB_STRUCT Fat12_16; 112 FAT32_BPB_STRUCT Fat32; 113 } FAT_BPB_STRUCT; 114 115 typedef enum { 116 FatTypeUnknown, 117 FatTypeFat12, 118 FatTypeFat16, 119 FatTypeFat32, 120 FatTypeMax 121 } FAT_TYPE; 122 123 typedef struct { 124 CHAR8 DIR_Name[11]; 125 UINT8 DIR_Attr; 126 UINT8 DIR_NTRes; 127 UINT8 DIR_CrtTimeTenth; 128 UINT16 DIR_CrtTime; 129 UINT16 DIR_CrtDate; 130 UINT16 DIR_LstAccDate; 131 UINT16 DIR_FstClusHI; 132 UINT16 DIR_WrtTime; 133 UINT16 DIR_WrtDate; 134 UINT16 DIR_FstClusLO; 135 UINT32 DIR_FileSize; 136 } FAT_DIRECTORY_ENTRY; 137 138 #pragma pack() 139 140 #define FAT_MAX_FAT12_CLUSTER 0xFF5 141 #define FAT_MAX_FAT16_CLUSTER 0xFFF5 142 143 #define FAT_BS_SIGNATURE 0xAA55 144 #define FAT_BS_BOOTSIG 0x29 145 #define FAT_BS_JMP1 0xEB 146 #define FAT_BS_JMP2 0xE9 147 #define FAT_FILSYSTYPE "FAT " 148 #define FAT12_FILSYSTYPE "FAT12 " 149 #define FAT16_FILSYSTYPE "FAT16 " 150 #define FAT32_FILSYSTYPE "FAT32 " 151 152 #endif 153