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| 1 | 13 | up20180614 | /* $NetBSD: bpb.h,v 1.7 2012/11/04 17:57:59 jakllsch Exp $ */
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| 2 | |||
| 3 | /*
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| 4 | * Written by Paul Popelka (paulp@uts.amdahl.com)
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| 5 | *
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| 6 | * You can do anything you want with this software, just don't say you wrote
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| 7 | * it, and don't remove this notice.
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| 8 | *
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| 9 | * This software is provided "as is".
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| 10 | *
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| 11 | * The author supplies this software to be publicly redistributed on the
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| 12 | * understanding that the author is not responsible for the correct
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| 13 | * functioning of this software in any circumstances and is not liable for
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| 14 | * any damages caused by this software.
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| 15 | *
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| 16 | * October 1992
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| 17 | */
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| 18 | |||
| 19 | #ifndef _MSDOSFS_BPB_H_
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| 20 | #define _MSDOSFS_BPB_H_
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| 21 | |||
| 22 | /*
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| 23 | * BIOS Parameter Block (BPB) for DOS 3.3
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| 24 | */
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| 25 | struct bpb33 {
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| 26 | u_int16_t bpbBytesPerSec; /* bytes per sector */
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| 27 | u_int8_t bpbSecPerClust; /* sectors per cluster */
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| 28 | u_int16_t bpbResSectors; /* number of reserved sectors */
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| 29 | u_int8_t bpbFATs; /* number of FATs */
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| 30 | u_int16_t bpbRootDirEnts; /* number of root directory entries */
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| 31 | u_int16_t bpbSectors; /* total number of sectors */
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| 32 | u_int8_t bpbMedia; /* media descriptor */
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| 33 | u_int16_t bpbFATsecs; /* number of sectors per FAT */
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| 34 | u_int16_t bpbSecPerTrack; /* sectors per track */
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| 35 | u_int16_t bpbHeads; /* number of heads */
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| 36 | u_int16_t bpbHiddenSecs; /* number of hidden sectors */
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| 37 | }; |
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| 38 | |||
| 39 | /*
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| 40 | * BPB for DOS 5.0 The difference is bpbHiddenSecs is a short for DOS 3.3,
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| 41 | * and bpbHugeSectors is not in the 3.3 bpb.
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| 42 | */
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| 43 | struct bpb50 {
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| 44 | u_int16_t bpbBytesPerSec; /* bytes per sector */
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| 45 | u_int8_t bpbSecPerClust; /* sectors per cluster */
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| 46 | u_int16_t bpbResSectors; /* number of reserved sectors */
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| 47 | u_int8_t bpbFATs; /* number of FATs */
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| 48 | u_int16_t bpbRootDirEnts; /* number of root directory entries */
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| 49 | u_int16_t bpbSectors; /* total number of sectors */
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| 50 | u_int8_t bpbMedia; /* media descriptor */
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| 51 | u_int16_t bpbFATsecs; /* number of sectors per FAT */
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| 52 | u_int16_t bpbSecPerTrack; /* sectors per track */
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| 53 | u_int16_t bpbHeads; /* number of heads */
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| 54 | u_int32_t bpbHiddenSecs; /* # of hidden sectors */
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| 55 | u_int32_t bpbHugeSectors; /* # of sectors if bpbSectors == 0 */
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| 56 | }; |
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| 57 | |||
| 58 | /*
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| 59 | * BPB for DOS 7.10 (FAT32). This one has a few extensions to bpb50.
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| 60 | */
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| 61 | struct bpb710 {
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| 62 | u_int16_t bpbBytesPerSec; /* bytes per sector */
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| 63 | u_int8_t bpbSecPerClust; /* sectors per cluster */
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| 64 | u_int16_t bpbResSectors; /* number of reserved sectors */
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| 65 | u_int8_t bpbFATs; /* number of FATs */
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| 66 | u_int16_t bpbRootDirEnts; /* number of root directory entries */
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| 67 | u_int16_t bpbSectors; /* total number of sectors */
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| 68 | u_int8_t bpbMedia; /* media descriptor */
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| 69 | u_int16_t bpbFATsecs; /* number of sectors per FAT */
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| 70 | u_int16_t bpbSecPerTrack; /* sectors per track */
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| 71 | u_int16_t bpbHeads; /* number of heads */
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| 72 | u_int32_t bpbHiddenSecs; /* # of hidden sectors */
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| 73 | u_int32_t bpbHugeSectors; /* # of sectors if bpbSectors == 0 */
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| 74 | u_int32_t bpbBigFATsecs; /* like bpbFATsecs for FAT32 */
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| 75 | u_int16_t bpbExtFlags; /* extended flags: */
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| 76 | #define FATNUM 0xf /* mask for numbering active FAT */ |
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| 77 | #define FATMIRROR 0x80 /* FAT is mirrored (like it always was) */ |
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| 78 | u_int16_t bpbFSVers; /* filesystem version */
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| 79 | #define FSVERS 0 /* currently only 0 is understood */ |
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| 80 | u_int32_t bpbRootClust; /* start cluster for root directory */
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| 81 | u_int16_t bpbFSInfo; /* filesystem info structure sector */
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| 82 | u_int16_t bpbBackup; /* backup boot sector */
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| 83 | u_int8_t bpbReserved[12]; /* Reserved for future expansion */ |
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| 84 | }; |
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| 85 | |||
| 86 | #ifdef atari
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| 87 | /*
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| 88 | * BPB for GEMDOS filesystems. Atari leaves the obsolete stuff undefined.
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| 89 | * Currently there is no need for a separate BPB structure.
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| 90 | */
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| 91 | #if 0
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| 92 | struct bpb_a {
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| 93 | u_int16_t bpbBytesPerSec; /* bytes per sector */
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| 94 | u_int8_t bpbSecPerClust; /* sectors per cluster */
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| 95 | u_int16_t bpbResSectors; /* number of reserved sectors */
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| 96 | u_int8_t bpbFATs; /* number of FATs */
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| 97 | u_int16_t bpbRootDirEnts; /* number of root directory entries */
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| 98 | u_int16_t bpbSectors; /* total number of sectors */
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| 99 | u_int8_t bpbUseless1; /* meaningless on GEMDOS FS */
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| 100 | u_int16_t bpbFATsecs; /* number of sectors per FAT */
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| 101 | u_int16_t bpbUseless2; /* meaningless for harddisk fs */
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| 102 | u_int16_t bpbUseless3; /* meaningless for harddisk fs */
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| 103 | u_int16_t bpbHiddenSecs; /* the TOS-BIOS ignores this */
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| 104 | };
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| 105 | #endif
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| 106 | #endif /* atari */ |
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| 107 | |||
| 108 | /*
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| 109 | * The following structures represent how the bpb's look on disk. shorts
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| 110 | * and longs are just character arrays of the appropriate length. This is
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| 111 | * because the compiler forces shorts and longs to align on word or
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| 112 | * halfword boundaries.
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| 113 | */
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| 114 | |||
| 115 | #include <sys/endian.h> |
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| 116 | |||
| 117 | #define getushort(p) le16dec(p)
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| 118 | #define getulong(p) le32dec(p)
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| 119 | #define putushort(p, v) le16enc((p), (v))
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| 120 | #define putulong(p, v) le32enc((p), (v))
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| 121 | |||
| 122 | /*
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| 123 | * BIOS Parameter Block (BPB) for DOS 3.3
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| 124 | */
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| 125 | struct byte_bpb33 {
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| 126 | int8_t bpbBytesPerSec[2]; /* bytes per sector */ |
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| 127 | int8_t bpbSecPerClust; /* sectors per cluster */
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| 128 | int8_t bpbResSectors[2]; /* number of reserved sectors */ |
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| 129 | int8_t bpbFATs; /* number of FATs */
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| 130 | int8_t bpbRootDirEnts[2]; /* number of root directory entries */ |
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| 131 | int8_t bpbSectors[2]; /* total number of sectors */ |
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| 132 | int8_t bpbMedia; /* media descriptor */
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| 133 | int8_t bpbFATsecs[2]; /* number of sectors per FAT */ |
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| 134 | int8_t bpbSecPerTrack[2]; /* sectors per track */ |
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| 135 | int8_t bpbHeads[2]; /* number of heads */ |
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| 136 | int8_t bpbHiddenSecs[2]; /* number of hidden sectors */ |
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| 137 | }; |
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| 138 | |||
| 139 | /*
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| 140 | * BPB for DOS 5.0 The difference is bpbHiddenSecs is a short for DOS 3.3,
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| 141 | * and bpbHugeSectors is not in the 3.3 bpb.
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| 142 | */
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| 143 | struct byte_bpb50 {
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| 144 | int8_t bpbBytesPerSec[2]; /* bytes per sector */ |
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| 145 | int8_t bpbSecPerClust; /* sectors per cluster */
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| 146 | int8_t bpbResSectors[2]; /* number of reserved sectors */ |
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| 147 | int8_t bpbFATs; /* number of FATs */
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| 148 | int8_t bpbRootDirEnts[2]; /* number of root directory entries */ |
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| 149 | int8_t bpbSectors[2]; /* total number of sectors */ |
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| 150 | int8_t bpbMedia; /* media descriptor */
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| 151 | int8_t bpbFATsecs[2]; /* number of sectors per FAT */ |
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| 152 | int8_t bpbSecPerTrack[2]; /* sectors per track */ |
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| 153 | int8_t bpbHeads[2]; /* number of heads */ |
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| 154 | int8_t bpbHiddenSecs[4]; /* number of hidden sectors */ |
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| 155 | int8_t bpbHugeSectors[4]; /* # of sectors if bpbSectors == 0 */ |
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| 156 | }; |
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| 157 | |||
| 158 | /*
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| 159 | * BPB for DOS 7.10 (FAT32). This one has a few extensions to bpb50.
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| 160 | */
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| 161 | struct byte_bpb710 {
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| 162 | u_int8_t bpbBytesPerSec[2]; /* bytes per sector */ |
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| 163 | u_int8_t bpbSecPerClust; /* sectors per cluster */
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| 164 | u_int8_t bpbResSectors[2]; /* number of reserved sectors */ |
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| 165 | u_int8_t bpbFATs; /* number of FATs */
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| 166 | u_int8_t bpbRootDirEnts[2]; /* number of root directory entries */ |
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| 167 | u_int8_t bpbSectors[2]; /* total number of sectors */ |
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| 168 | u_int8_t bpbMedia; /* media descriptor */
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| 169 | u_int8_t bpbFATsecs[2]; /* number of sectors per FAT */ |
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| 170 | u_int8_t bpbSecPerTrack[2]; /* sectors per track */ |
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| 171 | u_int8_t bpbHeads[2]; /* number of heads */ |
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| 172 | u_int8_t bpbHiddenSecs[4]; /* # of hidden sectors */ |
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| 173 | u_int8_t bpbHugeSectors[4]; /* # of sectors if bpbSectors == 0 */ |
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| 174 | u_int8_t bpbBigFATsecs[4]; /* like bpbFATsecs for FAT32 */ |
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| 175 | u_int8_t bpbExtFlags[2]; /* extended flags: */ |
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| 176 | u_int8_t bpbFSVers[2]; /* filesystem version */ |
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| 177 | u_int8_t bpbRootClust[4]; /* start cluster for root directory */ |
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| 178 | u_int8_t bpbFSInfo[2]; /* filesystem info structure sector */ |
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| 179 | u_int8_t bpbBackup[2]; /* backup boot sector */ |
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| 180 | u_int8_t bpbReserved[12]; /* Reserved for future expansion */ |
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| 181 | }; |
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| 182 | |||
| 183 | /*
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| 184 | * FAT32 FSInfo block.
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| 185 | */
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| 186 | struct fsinfo {
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| 187 | u_int8_t fsisig1[4];
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| 188 | u_int8_t fsifill1[480];
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| 189 | u_int8_t fsisig2[4];
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| 190 | u_int8_t fsinfree[4];
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| 191 | u_int8_t fsinxtfree[4];
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| 192 | u_int8_t fsifill2[12];
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| 193 | u_int8_t fsisig3[4];
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| 194 | u_int8_t fsifill3[508];
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| 195 | u_int8_t fsisig4[4];
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| 196 | }; |
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| 197 | #endif /* _MSDOSFS_BPB_H_ */ |