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121 lines
4.4 KiB
C
121 lines
4.4 KiB
C
/* $Id$ */
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/* $NetBSD: bpb.h,v 1.3 1994/06/29 06:35:29 cgd Exp $ */
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/*
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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, just don't say you wrote
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* it, 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 redistributed on the
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* understanding that the author is not responsible for the correct
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* functioning of this software in any circumstances and is not liable for
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* any damages caused by this software.
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*
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* October 1992
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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 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 sectors if bpbSectors == 0 */
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};
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/*
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* The following structures represent how the bpb's look on disk. shorts
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* and longs are just character arrays of the appropriate length. This is
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* because the compiler forces shorts and longs to align on word or
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* halfword boundaries.
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*
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* XXX The little-endian code here assumes that the processor can access
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* 16-bit and 32-bit quantities on byte boundaries. If this is not true,
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* use the macros for the big-endian case.
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*/
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#include <machine/endian.h>
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#if BYTE_ORDER == LITTLE_ENDIAN /* && can do unaligned accesses */
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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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#define getushort(x) (((u_char *)(x))[0] + (((u_char *)(x))[1] << 8))
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#define getulong(x) (((u_char *)(x))[0] + (((u_char *)(x))[1] << 8) \
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+ (((u_char *)(x))[2] << 16) \
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+ (((u_char *)(x))[3] << 24))
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#define putushort(p, v) (((u_char *)(p))[0] = (v), \
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((u_char *)(p))[1] = (v) >> 8)
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#define putulong(p, v) (((u_char *)(p))[0] = (v), \
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((u_char *)(p))[1] = (v) >> 8, \
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((u_char *)(p))[2] = (v) >> 16,\
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((u_char *)(p))[3] = (v) >> 24)
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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 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 sectors if bpbSectors == 0 */
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};
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