1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 | /* $NetBSD: bpb.h,v 1.8 2016/01/22 22:53:36 dholland Exp $ */ /* * Written by Paul Popelka (paulp@uts.amdahl.com) * * You can do anything you want with this software, just don't say you wrote * it, and don't remove this notice. * * This software is provided "as is". * * The author supplies this software to be publicly redistributed on the * understanding that the author is not responsible for the correct * functioning of this software in any circumstances and is not liable for * any damages caused by this software. * * October 1992 */ #ifndef _MSDOSFS_BPB_H_ #define _MSDOSFS_BPB_H_ /* * BIOS Parameter Block (BPB) for DOS 3.3 */ struct bpb33 { uint16_t bpbBytesPerSec; /* bytes per sector */ uint8_t bpbSecPerClust; /* sectors per cluster */ uint16_t bpbResSectors; /* number of reserved sectors */ uint8_t bpbFATs; /* number of FATs */ uint16_t bpbRootDirEnts; /* number of root directory entries */ uint16_t bpbSectors; /* total number of sectors */ uint8_t bpbMedia; /* media descriptor */ uint16_t bpbFATsecs; /* number of sectors per FAT */ uint16_t bpbSecPerTrack; /* sectors per track */ uint16_t bpbHeads; /* number of heads */ uint16_t bpbHiddenSecs; /* number of hidden sectors */ }; /* * BPB for DOS 5.0 The difference is bpbHiddenSecs is a short for DOS 3.3, * and bpbHugeSectors is not in the 3.3 bpb. */ struct bpb50 { uint16_t bpbBytesPerSec; /* bytes per sector */ uint8_t bpbSecPerClust; /* sectors per cluster */ uint16_t bpbResSectors; /* number of reserved sectors */ uint8_t bpbFATs; /* number of FATs */ uint16_t bpbRootDirEnts; /* number of root directory entries */ uint16_t bpbSectors; /* total number of sectors */ uint8_t bpbMedia; /* media descriptor */ uint16_t bpbFATsecs; /* number of sectors per FAT */ uint16_t bpbSecPerTrack; /* sectors per track */ uint16_t bpbHeads; /* number of heads */ uint32_t bpbHiddenSecs; /* # of hidden sectors */ uint32_t bpbHugeSectors; /* # of sectors if bpbSectors == 0 */ }; /* * BPB for DOS 7.10 (FAT32). This one has a few extensions to bpb50. */ struct bpb710 { uint16_t bpbBytesPerSec; /* bytes per sector */ uint8_t bpbSecPerClust; /* sectors per cluster */ uint16_t bpbResSectors; /* number of reserved sectors */ uint8_t bpbFATs; /* number of FATs */ uint16_t bpbRootDirEnts; /* number of root directory entries */ uint16_t bpbSectors; /* total number of sectors */ uint8_t bpbMedia; /* media descriptor */ uint16_t bpbFATsecs; /* number of sectors per FAT */ uint16_t bpbSecPerTrack; /* sectors per track */ uint16_t bpbHeads; /* number of heads */ uint32_t bpbHiddenSecs; /* # of hidden sectors */ uint32_t bpbHugeSectors; /* # of sectors if bpbSectors == 0 */ uint32_t bpbBigFATsecs; /* like bpbFATsecs for FAT32 */ uint16_t bpbExtFlags; /* extended flags: */ #define FATNUM 0xf /* mask for numbering active FAT */ #define FATMIRROR 0x80 /* FAT is mirrored (like it always was) */ uint16_t bpbFSVers; /* filesystem version */ #define FSVERS 0 /* currently only 0 is understood */ uint32_t bpbRootClust; /* start cluster for root directory */ uint16_t bpbFSInfo; /* filesystem info structure sector */ uint16_t bpbBackup; /* backup boot sector */ uint8_t bpbReserved[12]; /* Reserved for future expansion */ }; #ifdef atari /* * BPB for GEMDOS filesystems. Atari leaves the obsolete stuff undefined. * Currently there is no need for a separate BPB structure. */ #if 0 struct bpb_a { uint16_t bpbBytesPerSec; /* bytes per sector */ uint8_t bpbSecPerClust; /* sectors per cluster */ uint16_t bpbResSectors; /* number of reserved sectors */ uint8_t bpbFATs; /* number of FATs */ uint16_t bpbRootDirEnts; /* number of root directory entries */ uint16_t bpbSectors; /* total number of sectors */ uint8_t bpbUseless1; /* meaningless on GEMDOS FS */ uint16_t bpbFATsecs; /* number of sectors per FAT */ uint16_t bpbUseless2; /* meaningless for harddisk fs */ uint16_t bpbUseless3; /* meaningless for harddisk fs */ uint16_t bpbHiddenSecs; /* the TOS-BIOS ignores this */ }; #endif #endif /* atari */ /* * The following structures represent how the bpb's look on disk. shorts * and longs are just character arrays of the appropriate length. This is * because the compiler forces shorts and longs to align on word or * halfword boundaries. */ #include <sys/endian.h> #define getushort(p) le16dec(p) #define getulong(p) le32dec(p) #define putushort(p, v) le16enc((p), (v)) #define putulong(p, v) le32enc((p), (v)) /* * BIOS Parameter Block (BPB) for DOS 3.3 */ struct byte_bpb33 { int8_t bpbBytesPerSec[2]; /* bytes per sector */ int8_t bpbSecPerClust; /* sectors per cluster */ int8_t bpbResSectors[2]; /* number of reserved sectors */ int8_t bpbFATs; /* number of FATs */ int8_t bpbRootDirEnts[2]; /* number of root directory entries */ int8_t bpbSectors[2]; /* total number of sectors */ int8_t bpbMedia; /* media descriptor */ int8_t bpbFATsecs[2]; /* number of sectors per FAT */ int8_t bpbSecPerTrack[2]; /* sectors per track */ int8_t bpbHeads[2]; /* number of heads */ int8_t bpbHiddenSecs[2]; /* number of hidden sectors */ }; /* * BPB for DOS 5.0 The difference is bpbHiddenSecs is a short for DOS 3.3, * and bpbHugeSectors is not in the 3.3 bpb. */ struct byte_bpb50 { int8_t bpbBytesPerSec[2]; /* bytes per sector */ int8_t bpbSecPerClust; /* sectors per cluster */ int8_t bpbResSectors[2]; /* number of reserved sectors */ int8_t bpbFATs; /* number of FATs */ int8_t bpbRootDirEnts[2]; /* number of root directory entries */ int8_t bpbSectors[2]; /* total number of sectors */ int8_t bpbMedia; /* media descriptor */ int8_t bpbFATsecs[2]; /* number of sectors per FAT */ int8_t bpbSecPerTrack[2]; /* sectors per track */ int8_t bpbHeads[2]; /* number of heads */ int8_t bpbHiddenSecs[4]; /* number of hidden sectors */ int8_t bpbHugeSectors[4]; /* # of sectors if bpbSectors == 0 */ }; /* * BPB for DOS 7.10 (FAT32). This one has a few extensions to bpb50. */ struct byte_bpb710 { uint8_t bpbBytesPerSec[2]; /* bytes per sector */ uint8_t bpbSecPerClust; /* sectors per cluster */ uint8_t bpbResSectors[2]; /* number of reserved sectors */ uint8_t bpbFATs; /* number of FATs */ uint8_t bpbRootDirEnts[2]; /* number of root directory entries */ uint8_t bpbSectors[2]; /* total number of sectors */ uint8_t bpbMedia; /* media descriptor */ uint8_t bpbFATsecs[2]; /* number of sectors per FAT */ uint8_t bpbSecPerTrack[2]; /* sectors per track */ uint8_t bpbHeads[2]; /* number of heads */ uint8_t bpbHiddenSecs[4]; /* # of hidden sectors */ uint8_t bpbHugeSectors[4]; /* # of sectors if bpbSectors == 0 */ uint8_t bpbBigFATsecs[4]; /* like bpbFATsecs for FAT32 */ uint8_t bpbExtFlags[2]; /* extended flags: */ uint8_t bpbFSVers[2]; /* filesystem version */ uint8_t bpbRootClust[4]; /* start cluster for root directory */ uint8_t bpbFSInfo[2]; /* filesystem info structure sector */ uint8_t bpbBackup[2]; /* backup boot sector */ uint8_t bpbReserved[12]; /* Reserved for future expansion */ }; /* * FAT32 FSInfo block. */ struct fsinfo { uint8_t fsisig1[4]; uint8_t fsifill1[480]; uint8_t fsisig2[4]; uint8_t fsinfree[4]; uint8_t fsinxtfree[4]; uint8_t fsifill2[12]; uint8_t fsisig3[4]; uint8_t fsifill3[508]; uint8_t fsisig4[4]; }; #endif /* _MSDOSFS_BPB_H_ */ |