111 lines
3.8 KiB
C
111 lines
3.8 KiB
C
/*
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* Written by Paul Popelka (paulp@uts.amdahl.com)
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*
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* You can do anything you want with this software,
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* just don't say you wrote it,
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* and don't remove this notice.
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*
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* This software is provided "as is".
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*
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* The author supplies this software to be publicly
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* redistributed on the understanding that the author
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* is not responsible for the correct functioning of
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* this software in any circumstances and is not liable
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* for any damages caused by this software.
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*
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* October 1992
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*
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* $Id: bpb.h,v 1.2 1993/05/20 03:34:04 cgd Exp $
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*/
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/*
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* BIOS Parameter Block (BPB) for DOS 3.3
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*/
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struct bpb33 {
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u_short bpbBytesPerSec; /* bytes per sector */
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u_char bpbSecPerClust; /* sectors per cluster */
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u_short bpbResSectors; /* number of reserved sectors */
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u_char bpbFATs; /* number of FATs */
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u_short bpbRootDirEnts; /* number of root directory entries */
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u_short bpbSectors; /* total number of sectors */
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u_char bpbMedia; /* media descriptor */
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u_short bpbFATsecs; /* number of sectors per FAT */
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u_short bpbSecPerTrack; /* sectors per track */
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u_short bpbHeads; /* number of heads */
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u_short bpbHiddenSecs; /* number of hidden sectors */
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};
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/*
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* BPB for DOS 5.0
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* The difference is bpbHiddenSecs is a short for DOS 3.3,
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* and bpbHugeSectors is not in the 3.3 bpb.
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*/
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struct bpb50 {
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u_short bpbBytesPerSec; /* bytes per sector */
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u_char bpbSecPerClust; /* sectors per cluster */
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u_short bpbResSectors; /* number of reserved sectors */
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u_char bpbFATs; /* number of FATs */
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u_short bpbRootDirEnts; /* number of root directory entries */
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u_short bpbSectors; /* total number of sectors */
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u_char bpbMedia; /* media descriptor */
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u_short bpbFATsecs; /* number of sectors per FAT */
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u_short bpbSecPerTrack; /* sectors per track */
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u_short bpbHeads; /* number of heads */
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u_long bpbHiddenSecs; /* number of hidden sectors */
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u_long bpbHugeSectors; /* number of sectrs if bpbSectors == 0 */
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};
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/*
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* The following structures represent how the bpb's look
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* on disk. shorts and longs are just character arrays
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* of the appropriate length. This is because the compiler
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* forces shorts and longs to align on word or halfword
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* boundaries.
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*/
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#include <machine/endian.h>
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#if BYTE_ORDER == LITTLE_ENDIAN
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#define getushort(x) *((u_short *)(x))
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#define getulong(x) *((u_long *)(x))
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#define putushort(p, v) (*((u_short *)(p)) = (v))
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#define putulong(p, v) (*((u_long *)(p)) = (v))
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#else
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#endif
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/*
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* BIOS Parameter Block (BPB) for DOS 3.3
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*/
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struct byte_bpb33 {
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char bpbBytesPerSec[2]; /* bytes per sector */
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char bpbSecPerClust; /* sectors per cluster */
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char bpbResSectors[2]; /* number of reserved sectors */
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char bpbFATs; /* number of FATs */
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char bpbRootDirEnts[2]; /* number of root directory entries */
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char bpbSectors[2]; /* total number of sectors */
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char bpbMedia; /* media descriptor */
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char bpbFATsecs[2]; /* number of sectors per FAT */
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char bpbSecPerTrack[2]; /* sectors per track */
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char bpbHeads[2]; /* number of heads */
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char bpbHiddenSecs[2]; /* number of hidden sectors */
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};
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/*
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* BPB for DOS 5.0
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* The difference is bpbHiddenSecs is a short for DOS 3.3,
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* and bpbHugeSectors is not in the 3.3 bpb.
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*/
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struct byte_bpb50 {
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char bpbBytesPerSec[2]; /* bytes per sector */
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char bpbSecPerClust; /* sectors per cluster */
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char bpbResSectors[2]; /* number of reserved sectors */
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char bpbFATs; /* number of FATs */
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char bpbRootDirEnts[2]; /* number of root directory entries */
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char bpbSectors[2]; /* total number of sectors */
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char bpbMedia; /* media descriptor */
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char bpbFATsecs[2]; /* number of sectors per FAT */
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char bpbSecPerTrack[2]; /* sectors per track */
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char bpbHeads[2]; /* number of heads */
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char bpbHiddenSecs[4]; /* number of hidden sectors */
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char bpbHugeSectors[4]; /* number of sectrs if bpbSectors == 0 */
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};
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