projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 15637ed4 RG |
1 | /* |
| 2 | * Written by Paul Popelka (paulp@uts.amdahl.com) | |
| 3 | * | |
| 4 | * You can do anything you want with this software, | |
| 5 | * just don't say you wrote it, | |
| 6 | * and don't remove this notice. | |
| 7 | * | |
| 8 | * This software is provided "as is". | |
| 9 | * | |
| 10 | * The author supplies this software to be publicly | |
| 11 | * redistributed on the understanding that the author | |
| 12 | * is not responsible for the correct functioning of | |
| 13 | * this software in any circumstances and is not liable | |
| 14 | * for any damages caused by this software. | |
| 15 | * | |
| 16 | * October 1992 | |
| 17 | * | |
| bbc3f849 | 18 | * $Id: bpb.h,v 1.2 1993/10/16 19:29:25 rgrimes Exp $ |
| 15637ed4 RG |
19 | */ |
| 20 | ||
| bbc3f849 GW |
21 | #ifndef _PCFS_BPB_H_ |
| 22 | #define _PCFS_BPB_H_ 1 | |
| 23 | ||
| 15637ed4 RG |
24 | /* |
| 25 | * BIOS Parameter Block (BPB) for DOS 3.3 | |
| 26 | */ | |
| 27 | struct bpb33 { | |
| 28 | u_short bpbBytesPerSec; /* bytes per sector */ | |
| 29 | u_char bpbSecPerClust; /* sectors per cluster */ | |
| 30 | u_short bpbResSectors; /* number of reserved sectors */ | |
| 31 | u_char bpbFATs; /* number of FATs */ | |
| 32 | u_short bpbRootDirEnts; /* number of root directory entries */ | |
| 33 | u_short bpbSectors; /* total number of sectors */ | |
| 34 | u_char bpbMedia; /* media descriptor */ | |
| 35 | u_short bpbFATsecs; /* number of sectors per FAT */ | |
| 36 | u_short bpbSecPerTrack; /* sectors per track */ | |
| 37 | u_short bpbHeads; /* number of heads */ | |
| 38 | u_short bpbHiddenSecs; /* number of hidden sectors */ | |
| 39 | }; | |
| 40 | ||
| 41 | /* | |
| 42 | * BPB for DOS 5.0 | |
| 43 | * The difference is bpbHiddenSecs is a short for DOS 3.3, | |
| 44 | * and bpbHugeSectors is not in the 3.3 bpb. | |
| 45 | */ | |
| 46 | struct bpb50 { | |
| 47 | u_short bpbBytesPerSec; /* bytes per sector */ | |
| 48 | u_char bpbSecPerClust; /* sectors per cluster */ | |
| 49 | u_short bpbResSectors; /* number of reserved sectors */ | |
| 50 | u_char bpbFATs; /* number of FATs */ | |
| 51 | u_short bpbRootDirEnts; /* number of root directory entries */ | |
| 52 | u_short bpbSectors; /* total number of sectors */ | |
| 53 | u_char bpbMedia; /* media descriptor */ | |
| 54 | u_short bpbFATsecs; /* number of sectors per FAT */ | |
| 55 | u_short bpbSecPerTrack; /* sectors per track */ | |
| 56 | u_short bpbHeads; /* number of heads */ | |
| 57 | u_long bpbHiddenSecs; /* number of hidden sectors */ | |
| 58 | u_long bpbHugeSectors; /* number of sectrs if bpbSectors == 0 */ | |
| 59 | }; | |
| 60 | ||
| 61 | /* | |
| 62 | * The following structures represent how the bpb's look | |
| 63 | * on disk. shorts and longs are just character arrays | |
| 64 | * of the appropriate length. This is because the compiler | |
| 65 | * forces shorts and longs to align on word or halfword | |
| 66 | * boundaries. | |
| 67 | */ | |
| 68 | #include <machine/endian.h> | |
| 69 | #if BYTE_ORDER == LITTLE_ENDIAN | |
| 70 | #define getushort(x) *((u_short *)(x)) | |
| 71 | #define getulong(x) *((u_long *)(x)) | |
| 72 | #define putushort(p, v) (*((u_short *)(p)) = (v)) | |
| 73 | #define putulong(p, v) (*((u_long *)(p)) = (v)) | |
| 74 | #else | |
| 75 | ||
| 76 | #endif | |
| 77 | ||
| 78 | /* | |
| 79 | * BIOS Parameter Block (BPB) for DOS 3.3 | |
| 80 | */ | |
| 81 | struct byte_bpb33 { | |
| 82 | char bpbBytesPerSec[2]; /* bytes per sector */ | |
| 83 | char bpbSecPerClust; /* sectors per cluster */ | |
| 84 | char bpbResSectors[2]; /* number of reserved sectors */ | |
| 85 | char bpbFATs; /* number of FATs */ | |
| 86 | char bpbRootDirEnts[2]; /* number of root directory entries */ | |
| 87 | char bpbSectors[2]; /* total number of sectors */ | |
| 88 | char bpbMedia; /* media descriptor */ | |
| 89 | char bpbFATsecs[2]; /* number of sectors per FAT */ | |
| 90 | char bpbSecPerTrack[2]; /* sectors per track */ | |
| 91 | char bpbHeads[2]; /* number of heads */ | |
| 92 | char bpbHiddenSecs[2]; /* number of hidden sectors */ | |
| 93 | }; | |
| 94 | ||
| 95 | /* | |
| 96 | * BPB for DOS 5.0 | |
| 97 | * The difference is bpbHiddenSecs is a short for DOS 3.3, | |
| 98 | * and bpbHugeSectors is not in the 3.3 bpb. | |
| 99 | */ | |
| 100 | struct byte_bpb50 { | |
| 101 | char bpbBytesPerSec[2]; /* bytes per sector */ | |
| 102 | char bpbSecPerClust; /* sectors per cluster */ | |
| 103 | char bpbResSectors[2]; /* number of reserved sectors */ | |
| 104 | char bpbFATs; /* number of FATs */ | |
| 105 | char bpbRootDirEnts[2]; /* number of root directory entries */ | |
| 106 | char bpbSectors[2]; /* total number of sectors */ | |
| 107 | char bpbMedia; /* media descriptor */ | |
| 108 | char bpbFATsecs[2]; /* number of sectors per FAT */ | |
| 109 | char bpbSecPerTrack[2]; /* sectors per track */ | |
| 110 | char bpbHeads[2]; /* number of heads */ | |
| 111 | char bpbHiddenSecs[4]; /* number of hidden sectors */ | |
| 112 | char bpbHugeSectors[4]; /* number of sectrs if bpbSectors == 0 */ | |
| 113 | }; | |
| bbc3f849 | 114 | #endif /* _PCFS_BPB_H_ */ |