/*      $NetBSD: bpb.h,v 1.8 2016/01/22 22:53:36 dholland Exp $ */

/*
* Written by Paul Popelka ([email protected])
*
* 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
*/

#ifndef _MSDOSFS_BPB_H_
#define _MSDOSFS_BPB_H_

/*
* BIOS Parameter Block (BPB) for DOS 3.3
*/
struct bpb33 {
       uint16_t        bpbBytesPerSec; /* bytes per sector */
       uint8_t         bpbSecPerClust; /* sectors per cluster */
       uint16_t        bpbResSectors;  /* number of reserved sectors */
       uint8_t         bpbFATs;        /* number of FATs */
       uint16_t        bpbRootDirEnts; /* number of root directory entries */
       uint16_t        bpbSectors;     /* total number of sectors */
       uint8_t         bpbMedia;       /* media descriptor */
       uint16_t        bpbFATsecs;     /* number of sectors per FAT */
       uint16_t        bpbSecPerTrack; /* sectors per track */
       uint16_t        bpbHeads;       /* number of heads */
       uint16_t        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 {
       uint16_t        bpbBytesPerSec; /* bytes per sector */
       uint8_t         bpbSecPerClust; /* sectors per cluster */
       uint16_t        bpbResSectors;  /* number of reserved sectors */
       uint8_t         bpbFATs;        /* number of FATs */
       uint16_t        bpbRootDirEnts; /* number of root directory entries */
       uint16_t        bpbSectors;     /* total number of sectors */
       uint8_t         bpbMedia;       /* media descriptor */
       uint16_t        bpbFATsecs;     /* number of sectors per FAT */
       uint16_t        bpbSecPerTrack; /* sectors per track */
       uint16_t        bpbHeads;       /* number of heads */
       uint32_t        bpbHiddenSecs;  /* # of hidden sectors */
       uint32_t        bpbHugeSectors; /* # of sectors if bpbSectors == 0 */
};

/*
* BPB for DOS 7.10 (FAT32).  This one has a few extensions to bpb50.
*/
struct bpb710 {
       uint16_t        bpbBytesPerSec; /* bytes per sector */
       uint8_t         bpbSecPerClust; /* sectors per cluster */
       uint16_t        bpbResSectors;  /* number of reserved sectors */
       uint8_t         bpbFATs;        /* number of FATs */
       uint16_t        bpbRootDirEnts; /* number of root directory entries */
       uint16_t        bpbSectors;     /* total number of sectors */
       uint8_t         bpbMedia;       /* media descriptor */
       uint16_t        bpbFATsecs;     /* number of sectors per FAT */
       uint16_t        bpbSecPerTrack; /* sectors per track */
       uint16_t        bpbHeads;       /* number of heads */
       uint32_t        bpbHiddenSecs;  /* # of hidden sectors */
       uint32_t        bpbHugeSectors; /* # of sectors if bpbSectors == 0 */
       uint32_t        bpbBigFATsecs;  /* like bpbFATsecs for FAT32 */
       uint16_t        bpbExtFlags;    /* extended flags: */
#define FATNUM          0xf             /* mask for numbering active FAT */
#define FATMIRROR       0x80            /* FAT is mirrored (like it always was) */
       uint16_t        bpbFSVers;      /* filesystem version */
#define FSVERS          0               /* currently only 0 is understood */
       uint32_t        bpbRootClust;   /* start cluster for root directory */
       uint16_t        bpbFSInfo;      /* filesystem info structure sector */
       uint16_t        bpbBackup;      /* backup boot sector */
       uint8_t         bpbReserved[12]; /* Reserved for future expansion */
};

#ifdef  atari
/*
* BPB for GEMDOS filesystems. Atari leaves the obsolete stuff undefined.
* Currently there is no need for a separate BPB structure.
*/
#if 0
struct bpb_a {
       uint16_t        bpbBytesPerSec; /* bytes per sector             */
       uint8_t         bpbSecPerClust; /* sectors per cluster          */
       uint16_t        bpbResSectors;  /* number of reserved sectors   */
       uint8_t         bpbFATs;        /* number of FATs               */
       uint16_t        bpbRootDirEnts; /* number of root directory entries */
       uint16_t        bpbSectors;     /* total number of sectors      */
       uint8_t         bpbUseless1;    /* meaningless on GEMDOS FS     */
       uint16_t        bpbFATsecs;     /* number of sectors per FAT    */
       uint16_t        bpbUseless2;    /* meaningless for harddisk fs  */
       uint16_t        bpbUseless3;    /* meaningless for harddisk fs  */
       uint16_t        bpbHiddenSecs;  /* the TOS-BIOS ignores this    */
};
#endif
#endif  /* atari */

/*
* 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 <sys/endian.h>

#define getushort(p)    le16dec(p)
#define getulong(p)     le32dec(p)
#define putushort(p, v) le16enc((p), (v))
#define putulong(p, v)  le32enc((p), (v))

/*
* BIOS Parameter Block (BPB) for DOS 3.3
*/
struct byte_bpb33 {
       int8_t bpbBytesPerSec[2];       /* bytes per sector */
       int8_t bpbSecPerClust;          /* sectors per cluster */
       int8_t bpbResSectors[2];        /* number of reserved sectors */
       int8_t bpbFATs;                 /* number of FATs */
       int8_t bpbRootDirEnts[2];       /* number of root directory entries */
       int8_t bpbSectors[2];           /* total number of sectors */
       int8_t bpbMedia;                /* media descriptor */
       int8_t bpbFATsecs[2];           /* number of sectors per FAT */
       int8_t bpbSecPerTrack[2];       /* sectors per track */
       int8_t bpbHeads[2];             /* number of heads */
       int8_t 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 {
       int8_t bpbBytesPerSec[2];       /* bytes per sector */
       int8_t bpbSecPerClust;          /* sectors per cluster */
       int8_t bpbResSectors[2];        /* number of reserved sectors */
       int8_t bpbFATs;                 /* number of FATs */
       int8_t bpbRootDirEnts[2];       /* number of root directory entries */
       int8_t bpbSectors[2];           /* total number of sectors */
       int8_t bpbMedia;                /* media descriptor */
       int8_t bpbFATsecs[2];           /* number of sectors per FAT */
       int8_t bpbSecPerTrack[2];       /* sectors per track */
       int8_t bpbHeads[2];             /* number of heads */
       int8_t bpbHiddenSecs[4];        /* number of hidden sectors */
       int8_t bpbHugeSectors[4];       /* # of sectors if bpbSectors == 0 */
};

/*
* BPB for DOS 7.10 (FAT32).  This one has a few extensions to bpb50.
*/
struct byte_bpb710 {
       uint8_t bpbBytesPerSec[2];      /* bytes per sector */
       uint8_t bpbSecPerClust;         /* sectors per cluster */
       uint8_t bpbResSectors[2];       /* number of reserved sectors */
       uint8_t bpbFATs;                /* number of FATs */
       uint8_t bpbRootDirEnts[2];      /* number of root directory entries */
       uint8_t bpbSectors[2];          /* total number of sectors */
       uint8_t bpbMedia;               /* media descriptor */
       uint8_t bpbFATsecs[2];          /* number of sectors per FAT */
       uint8_t bpbSecPerTrack[2];      /* sectors per track */
       uint8_t bpbHeads[2];            /* number of heads */
       uint8_t bpbHiddenSecs[4];       /* # of hidden sectors */
       uint8_t bpbHugeSectors[4];      /* # of sectors if bpbSectors == 0 */
       uint8_t bpbBigFATsecs[4];       /* like bpbFATsecs for FAT32 */
       uint8_t bpbExtFlags[2];         /* extended flags: */
       uint8_t bpbFSVers[2];           /* filesystem version */
       uint8_t bpbRootClust[4];        /* start cluster for root directory */
       uint8_t bpbFSInfo[2];           /* filesystem info structure sector */
       uint8_t bpbBackup[2];           /* backup boot sector */
       uint8_t bpbReserved[12];        /* Reserved for future expansion */
};

/*
* FAT32 FSInfo block.
*/
struct fsinfo {
       uint8_t fsisig1[4];
       uint8_t fsifill1[480];
       uint8_t fsisig2[4];
       uint8_t fsinfree[4];
       uint8_t fsinxtfree[4];
       uint8_t fsifill2[12];
       uint8_t fsisig3[4];
       uint8_t fsifill3[508];
       uint8_t fsisig4[4];
};
#endif /* _MSDOSFS_BPB_H_ */