1/* $Id: bpb.h,v 1.1 1994/09/19 15:41:37 dfr Exp $ */
| 1/* $Id: bpb.h,v 1.2 1995/05/30 08:07:30 rgrimes Exp $ */
|
2/* $NetBSD: bpb.h,v 1.3 1994/06/29 06:35:29 cgd Exp $ */
3
4/*
5 * Written by Paul Popelka (paulp@uts.amdahl.com)
6 *
7 * You can do anything you want with this software, just don't say you wrote
8 * it, and don't remove this notice.
9 *
10 * This software is provided "as is".
11 *
12 * The author supplies this software to be publicly redistributed on the
13 * understanding that the author is not responsible for the correct
14 * functioning of this software in any circumstances and is not liable for
15 * any damages caused by this software.
16 *
17 * October 1992
18 */
19
20/*
21 * BIOS Parameter Block (BPB) for DOS 3.3
22 */
23struct bpb33 {
24 u_short bpbBytesPerSec; /* bytes per sector */
25 u_char bpbSecPerClust; /* sectors per cluster */
26 u_short bpbResSectors; /* number of reserved sectors */
27 u_char bpbFATs; /* number of FATs */
28 u_short bpbRootDirEnts; /* number of root directory entries */
29 u_short bpbSectors; /* total number of sectors */
30 u_char bpbMedia; /* media descriptor */
31 u_short bpbFATsecs; /* number of sectors per FAT */
32 u_short bpbSecPerTrack; /* sectors per track */
33 u_short bpbHeads; /* number of heads */
34 u_short bpbHiddenSecs; /* number of hidden sectors */
35};
36
37/*
38 * BPB for DOS 5.0 The difference is bpbHiddenSecs is a short for DOS 3.3,
39 * and bpbHugeSectors is not in the 3.3 bpb.
40 */
41struct bpb50 {
42 u_short bpbBytesPerSec; /* bytes per sector */
43 u_char bpbSecPerClust; /* sectors per cluster */
44 u_short bpbResSectors; /* number of reserved sectors */
45 u_char bpbFATs; /* number of FATs */
46 u_short bpbRootDirEnts; /* number of root directory entries */
47 u_short bpbSectors; /* total number of sectors */
48 u_char bpbMedia; /* media descriptor */
49 u_short bpbFATsecs; /* number of sectors per FAT */
50 u_short bpbSecPerTrack; /* sectors per track */
51 u_short bpbHeads; /* number of heads */
52 u_long bpbHiddenSecs; /* number of hidden sectors */
| 2/* $NetBSD: bpb.h,v 1.3 1994/06/29 06:35:29 cgd Exp $ */
3
4/*
5 * Written by Paul Popelka (paulp@uts.amdahl.com)
6 *
7 * You can do anything you want with this software, just don't say you wrote
8 * it, and don't remove this notice.
9 *
10 * This software is provided "as is".
11 *
12 * The author supplies this software to be publicly redistributed on the
13 * understanding that the author is not responsible for the correct
14 * functioning of this software in any circumstances and is not liable for
15 * any damages caused by this software.
16 *
17 * October 1992
18 */
19
20/*
21 * BIOS Parameter Block (BPB) for DOS 3.3
22 */
23struct bpb33 {
24 u_short bpbBytesPerSec; /* bytes per sector */
25 u_char bpbSecPerClust; /* sectors per cluster */
26 u_short bpbResSectors; /* number of reserved sectors */
27 u_char bpbFATs; /* number of FATs */
28 u_short bpbRootDirEnts; /* number of root directory entries */
29 u_short bpbSectors; /* total number of sectors */
30 u_char bpbMedia; /* media descriptor */
31 u_short bpbFATsecs; /* number of sectors per FAT */
32 u_short bpbSecPerTrack; /* sectors per track */
33 u_short bpbHeads; /* number of heads */
34 u_short bpbHiddenSecs; /* number of hidden sectors */
35};
36
37/*
38 * BPB for DOS 5.0 The difference is bpbHiddenSecs is a short for DOS 3.3,
39 * and bpbHugeSectors is not in the 3.3 bpb.
40 */
41struct bpb50 {
42 u_short bpbBytesPerSec; /* bytes per sector */
43 u_char bpbSecPerClust; /* sectors per cluster */
44 u_short bpbResSectors; /* number of reserved sectors */
45 u_char bpbFATs; /* number of FATs */
46 u_short bpbRootDirEnts; /* number of root directory entries */
47 u_short bpbSectors; /* total number of sectors */
48 u_char bpbMedia; /* media descriptor */
49 u_short bpbFATsecs; /* number of sectors per FAT */
50 u_short bpbSecPerTrack; /* sectors per track */
51 u_short bpbHeads; /* number of heads */
52 u_long bpbHiddenSecs; /* number of hidden sectors */
|
53 u_long bpbHugeSectors; /* number of sectrs if bpbSectors == 0 */
| 53 u_long bpbHugeSectors; /* number of sectors if bpbSectors == 0 */
|
54};
55
56/*
57 * The following structures represent how the bpb's look on disk. shorts
58 * and longs are just character arrays of the appropriate length. This is
59 * because the compiler forces shorts and longs to align on word or
60 * halfword boundaries.
61 *
62 * XXX The little-endian code here assumes that the processor can access
63 * 16-bit and 32-bit quantities on byte boundaries. If this is not true,
64 * use the macros for the big-endian case.
65 */
66#include <machine/endian.h>
67#if BYTE_ORDER == LITTLE_ENDIAN /* && can do unaligned accesses */
68#define getushort(x) *((u_short *)(x))
69#define getulong(x) *((u_long *)(x))
70#define putushort(p, v) (*((u_short *)(p)) = (v))
71#define putulong(p, v) (*((u_long *)(p)) = (v))
72
73#else
74#define getushort(x) (((u_char *)(x))[0] + (((u_char *)(x))[1] << 8))
75#define getulong(x) (((u_char *)(x))[0] + (((u_char *)(x))[1] << 8) \
76 + (((u_char *)(x))[2] << 16) \
77 + (((u_char *)(x))[3] << 24))
78#define putushort(p, v) (((u_char *)(p))[0] = (v), \
79 ((u_char *)(p))[1] = (v) >> 8)
80#define putulong(p, v) (((u_char *)(p))[0] = (v), \
81 ((u_char *)(p))[1] = (v) >> 8, \
82 ((u_char *)(p))[2] = (v) >> 16,\
83 ((u_char *)(p))[3] = (v) >> 24)
84#endif
85
86/*
87 * BIOS Parameter Block (BPB) for DOS 3.3
88 */
89struct byte_bpb33 {
90 char bpbBytesPerSec[2]; /* bytes per sector */
91 char bpbSecPerClust; /* sectors per cluster */
92 char bpbResSectors[2]; /* number of reserved sectors */
93 char bpbFATs; /* number of FATs */
94 char bpbRootDirEnts[2]; /* number of root directory entries */
95 char bpbSectors[2]; /* total number of sectors */
96 char bpbMedia; /* media descriptor */
97 char bpbFATsecs[2]; /* number of sectors per FAT */
98 char bpbSecPerTrack[2]; /* sectors per track */
99 char bpbHeads[2]; /* number of heads */
100 char bpbHiddenSecs[2]; /* number of hidden sectors */
101};
102
103/*
104 * BPB for DOS 5.0 The difference is bpbHiddenSecs is a short for DOS 3.3,
105 * and bpbHugeSectors is not in the 3.3 bpb.
106 */
107struct byte_bpb50 {
108 char bpbBytesPerSec[2]; /* bytes per sector */
109 char bpbSecPerClust; /* sectors per cluster */
110 char bpbResSectors[2]; /* number of reserved sectors */
111 char bpbFATs; /* number of FATs */
112 char bpbRootDirEnts[2]; /* number of root directory entries */
113 char bpbSectors[2]; /* total number of sectors */
114 char bpbMedia; /* media descriptor */
115 char bpbFATsecs[2]; /* number of sectors per FAT */
116 char bpbSecPerTrack[2]; /* sectors per track */
117 char bpbHeads[2]; /* number of heads */
118 char bpbHiddenSecs[4]; /* number of hidden sectors */
| 54};
55
56/*
57 * The following structures represent how the bpb's look on disk. shorts
58 * and longs are just character arrays of the appropriate length. This is
59 * because the compiler forces shorts and longs to align on word or
60 * halfword boundaries.
61 *
62 * XXX The little-endian code here assumes that the processor can access
63 * 16-bit and 32-bit quantities on byte boundaries. If this is not true,
64 * use the macros for the big-endian case.
65 */
66#include <machine/endian.h>
67#if BYTE_ORDER == LITTLE_ENDIAN /* && can do unaligned accesses */
68#define getushort(x) *((u_short *)(x))
69#define getulong(x) *((u_long *)(x))
70#define putushort(p, v) (*((u_short *)(p)) = (v))
71#define putulong(p, v) (*((u_long *)(p)) = (v))
72
73#else
74#define getushort(x) (((u_char *)(x))[0] + (((u_char *)(x))[1] << 8))
75#define getulong(x) (((u_char *)(x))[0] + (((u_char *)(x))[1] << 8) \
76 + (((u_char *)(x))[2] << 16) \
77 + (((u_char *)(x))[3] << 24))
78#define putushort(p, v) (((u_char *)(p))[0] = (v), \
79 ((u_char *)(p))[1] = (v) >> 8)
80#define putulong(p, v) (((u_char *)(p))[0] = (v), \
81 ((u_char *)(p))[1] = (v) >> 8, \
82 ((u_char *)(p))[2] = (v) >> 16,\
83 ((u_char *)(p))[3] = (v) >> 24)
84#endif
85
86/*
87 * BIOS Parameter Block (BPB) for DOS 3.3
88 */
89struct byte_bpb33 {
90 char bpbBytesPerSec[2]; /* bytes per sector */
91 char bpbSecPerClust; /* sectors per cluster */
92 char bpbResSectors[2]; /* number of reserved sectors */
93 char bpbFATs; /* number of FATs */
94 char bpbRootDirEnts[2]; /* number of root directory entries */
95 char bpbSectors[2]; /* total number of sectors */
96 char bpbMedia; /* media descriptor */
97 char bpbFATsecs[2]; /* number of sectors per FAT */
98 char bpbSecPerTrack[2]; /* sectors per track */
99 char bpbHeads[2]; /* number of heads */
100 char bpbHiddenSecs[2]; /* number of hidden sectors */
101};
102
103/*
104 * BPB for DOS 5.0 The difference is bpbHiddenSecs is a short for DOS 3.3,
105 * and bpbHugeSectors is not in the 3.3 bpb.
106 */
107struct byte_bpb50 {
108 char bpbBytesPerSec[2]; /* bytes per sector */
109 char bpbSecPerClust; /* sectors per cluster */
110 char bpbResSectors[2]; /* number of reserved sectors */
111 char bpbFATs; /* number of FATs */
112 char bpbRootDirEnts[2]; /* number of root directory entries */
113 char bpbSectors[2]; /* total number of sectors */
114 char bpbMedia; /* media descriptor */
115 char bpbFATsecs[2]; /* number of sectors per FAT */
116 char bpbSecPerTrack[2]; /* sectors per track */
117 char bpbHeads[2]; /* number of heads */
118 char bpbHiddenSecs[4]; /* number of hidden sectors */
|
119 char bpbHugeSectors[4]; /* number of sectrs if bpbSectors == 0 */
| 119 char bpbHugeSectors[4]; /* number of sectors if bpbSectors == 0 */
|
120};
| 120};
|