121 lines
4.4 KiB
C
121 lines
4.4 KiB
C
/* $Id$ */
|
|
/* $NetBSD: bpb.h,v 1.3 1994/06/29 06:35:29 cgd Exp $ */
|
|
|
|
/*
|
|
* Written by Paul Popelka (paulp@uts.amdahl.com)
|
|
*
|
|
* You can do anything you want with this software, just don't say you wrote
|
|
* it, and don't remove this notice.
|
|
*
|
|
* This software is provided "as is".
|
|
*
|
|
* The author supplies this software to be publicly redistributed on the
|
|
* understanding that the author is not responsible for the correct
|
|
* functioning of this software in any circumstances and is not liable for
|
|
* any damages caused by this software.
|
|
*
|
|
* October 1992
|
|
*/
|
|
|
|
/*
|
|
* BIOS Parameter Block (BPB) for DOS 3.3
|
|
*/
|
|
struct bpb33 {
|
|
u_short bpbBytesPerSec; /* bytes per sector */
|
|
u_char bpbSecPerClust; /* sectors per cluster */
|
|
u_short bpbResSectors; /* number of reserved sectors */
|
|
u_char bpbFATs; /* number of FATs */
|
|
u_short bpbRootDirEnts; /* number of root directory entries */
|
|
u_short bpbSectors; /* total number of sectors */
|
|
u_char bpbMedia; /* media descriptor */
|
|
u_short bpbFATsecs; /* number of sectors per FAT */
|
|
u_short bpbSecPerTrack; /* sectors per track */
|
|
u_short bpbHeads; /* number of heads */
|
|
u_short bpbHiddenSecs; /* number of hidden sectors */
|
|
};
|
|
|
|
/*
|
|
* BPB for DOS 5.0 The difference is bpbHiddenSecs is a short for DOS 3.3,
|
|
* and bpbHugeSectors is not in the 3.3 bpb.
|
|
*/
|
|
struct bpb50 {
|
|
u_short bpbBytesPerSec; /* bytes per sector */
|
|
u_char bpbSecPerClust; /* sectors per cluster */
|
|
u_short bpbResSectors; /* number of reserved sectors */
|
|
u_char bpbFATs; /* number of FATs */
|
|
u_short bpbRootDirEnts; /* number of root directory entries */
|
|
u_short bpbSectors; /* total number of sectors */
|
|
u_char bpbMedia; /* media descriptor */
|
|
u_short bpbFATsecs; /* number of sectors per FAT */
|
|
u_short bpbSecPerTrack; /* sectors per track */
|
|
u_short bpbHeads; /* number of heads */
|
|
u_long bpbHiddenSecs; /* number of hidden sectors */
|
|
u_long bpbHugeSectors; /* number of sectrs if bpbSectors == 0 */
|
|
};
|
|
|
|
/*
|
|
* The following structures represent how the bpb's look on disk. shorts
|
|
* and longs are just character arrays of the appropriate length. This is
|
|
* because the compiler forces shorts and longs to align on word or
|
|
* halfword boundaries.
|
|
*
|
|
* XXX The little-endian code here assumes that the processor can access
|
|
* 16-bit and 32-bit quantities on byte boundaries. If this is not true,
|
|
* use the macros for the big-endian case.
|
|
*/
|
|
#include <machine/endian.h>
|
|
#if BYTE_ORDER == LITTLE_ENDIAN /* && can do unaligned accesses */
|
|
#define getushort(x) *((u_short *)(x))
|
|
#define getulong(x) *((u_long *)(x))
|
|
#define putushort(p, v) (*((u_short *)(p)) = (v))
|
|
#define putulong(p, v) (*((u_long *)(p)) = (v))
|
|
|
|
#else
|
|
#define getushort(x) (((u_char *)(x))[0] + (((u_char *)(x))[1] << 8))
|
|
#define getulong(x) (((u_char *)(x))[0] + (((u_char *)(x))[1] << 8) \
|
|
+ (((u_char *)(x))[2] << 16) \
|
|
+ (((u_char *)(x))[3] << 24))
|
|
#define putushort(p, v) (((u_char *)(p))[0] = (v), \
|
|
((u_char *)(p))[1] = (v) >> 8)
|
|
#define putulong(p, v) (((u_char *)(p))[0] = (v), \
|
|
((u_char *)(p))[1] = (v) >> 8, \
|
|
((u_char *)(p))[2] = (v) >> 16,\
|
|
((u_char *)(p))[3] = (v) >> 24)
|
|
#endif
|
|
|
|
/*
|
|
* BIOS Parameter Block (BPB) for DOS 3.3
|
|
*/
|
|
struct byte_bpb33 {
|
|
char bpbBytesPerSec[2]; /* bytes per sector */
|
|
char bpbSecPerClust; /* sectors per cluster */
|
|
char bpbResSectors[2]; /* number of reserved sectors */
|
|
char bpbFATs; /* number of FATs */
|
|
char bpbRootDirEnts[2]; /* number of root directory entries */
|
|
char bpbSectors[2]; /* total number of sectors */
|
|
char bpbMedia; /* media descriptor */
|
|
char bpbFATsecs[2]; /* number of sectors per FAT */
|
|
char bpbSecPerTrack[2]; /* sectors per track */
|
|
char bpbHeads[2]; /* number of heads */
|
|
char bpbHiddenSecs[2]; /* number of hidden sectors */
|
|
};
|
|
|
|
/*
|
|
* BPB for DOS 5.0 The difference is bpbHiddenSecs is a short for DOS 3.3,
|
|
* and bpbHugeSectors is not in the 3.3 bpb.
|
|
*/
|
|
struct byte_bpb50 {
|
|
char bpbBytesPerSec[2]; /* bytes per sector */
|
|
char bpbSecPerClust; /* sectors per cluster */
|
|
char bpbResSectors[2]; /* number of reserved sectors */
|
|
char bpbFATs; /* number of FATs */
|
|
char bpbRootDirEnts[2]; /* number of root directory entries */
|
|
char bpbSectors[2]; /* total number of sectors */
|
|
char bpbMedia; /* media descriptor */
|
|
char bpbFATsecs[2]; /* number of sectors per FAT */
|
|
char bpbSecPerTrack[2]; /* sectors per track */
|
|
char bpbHeads[2]; /* number of heads */
|
|
char bpbHiddenSecs[4]; /* number of hidden sectors */
|
|
char bpbHugeSectors[4]; /* number of sectrs if bpbSectors == 0 */
|
|
};
|