Annotation of src/sys/fs/msdosfs/bpb.h, Revision 1.6
1.6 ! cbiere 1: /* $NetBSD: bpb.h,v 1.5 2006/11/30 15:59:23 christos Exp $ */
1.1 jdolecek 2:
3: /*
4: * Written by Paul Popelka (paulp@uts.amdahl.com)
5: *
6: * You can do anything you want with this software, just don't say you wrote
7: * it, and don't remove this notice.
8: *
9: * This software is provided "as is".
10: *
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.
15: *
16: * October 1992
17: */
18:
1.4 christos 19: #ifndef _MSDOSFS_BPB_H_
20: #define _MSDOSFS_BPB_H_
21:
1.1 jdolecek 22: /*
23: * BIOS Parameter Block (BPB) for DOS 3.3
24: */
25: struct bpb33 {
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 */
37: };
38:
39: /*
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.
42: */
43: struct bpb50 {
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 */
56: };
57:
58: /*
59: * BPB for DOS 7.10 (FAT32). This one has a few extensions to bpb50.
60: */
61: struct bpb710 {
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 */
1.2 lukem 83: u_int8_t bpbReserved[12]; /* Reserved for future expansion */
1.1 jdolecek 84: };
85:
86: #ifdef atari
87: /*
88: * BPB for gemdos filesystems. Atari leaves the obsolete stuff undefined.
89: * Currently there is no need for a separate BPB structure.
90: */
91: #if 0
92: struct bpb_a {
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 */
104: };
105: #endif
106: #endif /* atari */
107:
108: /*
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.
1.6 ! cbiere 113: */
! 114:
! 115: #include <sys/endian.h>
! 116:
! 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))
1.1 jdolecek 121:
122: /*
123: * BIOS Parameter Block (BPB) for DOS 3.3
124: */
125: struct byte_bpb33 {
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 */
137: };
138:
139: /*
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.
142: */
143: struct byte_bpb50 {
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 */
156: };
157:
158: /*
159: * BPB for DOS 7.10 (FAT32). This one has a few extensions to bpb50.
160: */
161: struct byte_bpb710 {
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 */
1.2 lukem 180: u_int8_t bpbReserved[12]; /* Reserved for future expansion */
1.1 jdolecek 181: };
182:
183: /*
184: * FAT32 FSInfo block.
185: */
186: struct fsinfo {
187: u_int8_t fsisig1[4];
188: u_int8_t fsifill1[480];
189: u_int8_t fsisig2[4];
190: u_int8_t fsinfree[4];
191: u_int8_t fsinxtfree[4];
192: u_int8_t fsifill2[12];
193: u_int8_t fsisig3[4];
194: u_int8_t fsifill3[508];
195: u_int8_t fsisig4[4];
196: };
1.4 christos 197: #endif /* _MSDOSFS_BPB_H_ */
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