Initial import, 0.1 + pk 0.2.4-B1

[unix-history] / sys / pcfs / bpb.h

/*
*  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
*
*      $Header: /usr/src/CVS/sys/pcfs/bpb.h,v 1.1.2.1 1993/02/07 21:57:08 friedl Exp $
*
*/

/*
*  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.
*/
#include <machine/endian.h>
#if BYTE_ORDER == LITTLE_ENDIAN
#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

#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  */
};