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