The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/fs/msdosfs/bpb.h

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    1 /* $FreeBSD$ */
    2 /*      $NetBSD: bpb.h,v 1.7 1997/11/17 15:36:24 ws Exp $       */
    3 
    4 /*-
    5  * Written by Paul Popelka (paulp@uts.amdahl.com)
    6  *
    7  * You can do anything you want with this software, just don't say you wrote
    8  * it, and don't remove this notice.
    9  *
   10  * This software is provided "as is".
   11  *
   12  * The author supplies this software to be publicly redistributed on the
   13  * understanding that the author is not responsible for the correct
   14  * functioning of this software in any circumstances and is not liable for
   15  * any damages caused by this software.
   16  *
   17  * October 1992
   18  */
   19 
   20 #ifndef _FS_MSDOSFS_BPB_H_
   21 #define _FS_MSDOSFS_BPB_H_
   22 
   23 /*
   24  * BIOS Parameter Block (BPB) for DOS 3.3
   25  */
   26 struct bpb33 {
   27         u_int16_t       bpbBytesPerSec; /* bytes per sector */
   28         u_int8_t        bpbSecPerClust; /* sectors per cluster */
   29         u_int16_t       bpbResSectors;  /* number of reserved sectors */
   30         u_int8_t        bpbFATs;        /* number of FATs */
   31         u_int16_t       bpbRootDirEnts; /* number of root directory entries */
   32         u_int16_t       bpbSectors;     /* total number of sectors */
   33         u_int8_t        bpbMedia;       /* media descriptor */
   34         u_int16_t       bpbFATsecs;     /* number of sectors per FAT */
   35         u_int16_t       bpbSecPerTrack; /* sectors per track */
   36         u_int16_t       bpbHeads;       /* number of heads */
   37         u_int16_t       bpbHiddenSecs;  /* number of hidden sectors */
   38 };
   39 
   40 /*
   41  * BPB for DOS 5.0 The difference is bpbHiddenSecs is a short for DOS 3.3,
   42  * and bpbHugeSectors is not in the 3.3 bpb.
   43  */
   44 struct bpb50 {
   45         u_int16_t       bpbBytesPerSec; /* bytes per sector */
   46         u_int8_t        bpbSecPerClust; /* sectors per cluster */
   47         u_int16_t       bpbResSectors;  /* number of reserved sectors */
   48         u_int8_t        bpbFATs;        /* number of FATs */
   49         u_int16_t       bpbRootDirEnts; /* number of root directory entries */
   50         u_int16_t       bpbSectors;     /* total number of sectors */
   51         u_int8_t        bpbMedia;       /* media descriptor */
   52         u_int16_t       bpbFATsecs;     /* number of sectors per FAT */
   53         u_int16_t       bpbSecPerTrack; /* sectors per track */
   54         u_int16_t       bpbHeads;       /* number of heads */
   55         u_int32_t       bpbHiddenSecs;  /* # of hidden sectors */
   56         u_int32_t       bpbHugeSectors; /* # of sectors if bpbSectors == 0 */
   57 };
   58 
   59 /*
   60  * BPB for DOS 7.10 (FAT32).  This one has a few extensions to bpb50.
   61  */
   62 struct bpb710 {
   63         u_int16_t       bpbBytesPerSec; /* bytes per sector */
   64         u_int8_t        bpbSecPerClust; /* sectors per cluster */
   65         u_int16_t       bpbResSectors;  /* number of reserved sectors */
   66         u_int8_t        bpbFATs;        /* number of FATs */
   67         u_int16_t       bpbRootDirEnts; /* number of root directory entries */
   68         u_int16_t       bpbSectors;     /* total number of sectors */
   69         u_int8_t        bpbMedia;       /* media descriptor */
   70         u_int16_t       bpbFATsecs;     /* number of sectors per FAT */
   71         u_int16_t       bpbSecPerTrack; /* sectors per track */
   72         u_int16_t       bpbHeads;       /* number of heads */
   73         u_int32_t       bpbHiddenSecs;  /* # of hidden sectors */
   74         u_int32_t       bpbHugeSectors; /* # of sectors if bpbSectors == 0 */
   75         u_int32_t       bpbBigFATsecs;  /* like bpbFATsecs for FAT32 */
   76         u_int16_t       bpbExtFlags;    /* extended flags: */
   77 #define FATNUM          0xf             /* mask for numbering active FAT */
   78 #define FATMIRROR       0x80            /* FAT is mirrored (like it always was) */
   79         u_int16_t       bpbFSVers;      /* filesystem version */
   80 #define FSVERS          0               /* currently only 0 is understood */
   81         u_int32_t       bpbRootClust;   /* start cluster for root directory */
   82         u_int16_t       bpbFSInfo;      /* filesystem info structure sector */
   83         u_int16_t       bpbBackup;      /* backup boot sector */
   84         u_int8_t        bpbReserved[12]; /* reserved for future expansion */
   85 };
   86 
   87 /*
   88  * The following structures represent how the bpb's look on disk.  shorts
   89  * and longs are just character arrays of the appropriate length.  This is
   90  * because the compiler forces shorts and longs to align on word or
   91  * halfword boundaries.
   92  */
   93 
   94 #include <sys/endian.h>
   95 
   96 #define getushort(x)    le16dec(x)
   97 #define getulong(x)     le32dec(x)
   98 #define putushort(p, v) le16enc(p, v)
   99 #define putulong(p, v)  le32enc(p, v)
  100 
  101 /*
  102  * BIOS Parameter Block (BPB) for DOS 3.3
  103  */
  104 struct byte_bpb33 {
  105         int8_t bpbBytesPerSec[2];       /* bytes per sector */
  106         int8_t bpbSecPerClust;          /* sectors per cluster */
  107         int8_t bpbResSectors[2];        /* number of reserved sectors */
  108         int8_t bpbFATs;                 /* number of FATs */
  109         int8_t bpbRootDirEnts[2];       /* number of root directory entries */
  110         int8_t bpbSectors[2];           /* total number of sectors */
  111         int8_t bpbMedia;                /* media descriptor */
  112         int8_t bpbFATsecs[2];           /* number of sectors per FAT */
  113         int8_t bpbSecPerTrack[2];       /* sectors per track */
  114         int8_t bpbHeads[2];             /* number of heads */
  115         int8_t bpbHiddenSecs[2];        /* number of hidden sectors */
  116 };
  117 
  118 /*
  119  * BPB for DOS 5.0 The difference is bpbHiddenSecs is a short for DOS 3.3,
  120  * and bpbHugeSectors is not in the 3.3 bpb.
  121  */
  122 struct byte_bpb50 {
  123         int8_t bpbBytesPerSec[2];       /* bytes per sector */
  124         int8_t bpbSecPerClust;          /* sectors per cluster */
  125         int8_t bpbResSectors[2];        /* number of reserved sectors */
  126         int8_t bpbFATs;                 /* number of FATs */
  127         int8_t bpbRootDirEnts[2];       /* number of root directory entries */
  128         int8_t bpbSectors[2];           /* total number of sectors */
  129         int8_t bpbMedia;                /* media descriptor */
  130         int8_t bpbFATsecs[2];           /* number of sectors per FAT */
  131         int8_t bpbSecPerTrack[2];       /* sectors per track */
  132         int8_t bpbHeads[2];             /* number of heads */
  133         int8_t bpbHiddenSecs[4];        /* number of hidden sectors */
  134         int8_t bpbHugeSectors[4];       /* # of sectors if bpbSectors == 0 */
  135 };
  136 
  137 /*
  138  * BPB for DOS 7.10 (FAT32).  This one has a few extensions to bpb50.
  139  */
  140 struct byte_bpb710 {
  141         u_int8_t bpbBytesPerSec[2];     /* bytes per sector */
  142         u_int8_t bpbSecPerClust;        /* sectors per cluster */
  143         u_int8_t bpbResSectors[2];      /* number of reserved sectors */
  144         u_int8_t bpbFATs;               /* number of FATs */
  145         u_int8_t bpbRootDirEnts[2];     /* number of root directory entries */
  146         u_int8_t bpbSectors[2];         /* total number of sectors */
  147         u_int8_t bpbMedia;              /* media descriptor */
  148         u_int8_t bpbFATsecs[2];         /* number of sectors per FAT */
  149         u_int8_t bpbSecPerTrack[2];     /* sectors per track */
  150         u_int8_t bpbHeads[2];           /* number of heads */
  151         u_int8_t bpbHiddenSecs[4];      /* # of hidden sectors */
  152         u_int8_t bpbHugeSectors[4];     /* # of sectors if bpbSectors == 0 */
  153         u_int8_t bpbBigFATsecs[4];      /* like bpbFATsecs for FAT32 */
  154         u_int8_t bpbExtFlags[2];        /* extended flags: */
  155         u_int8_t bpbFSVers[2];          /* filesystem version */
  156         u_int8_t bpbRootClust[4];       /* start cluster for root directory */
  157         u_int8_t bpbFSInfo[2];          /* filesystem info structure sector */
  158         u_int8_t bpbBackup[2];          /* backup boot sector */
  159         u_int8_t bpbReserved[12];       /* reserved for future expansion */
  160 };
  161 
  162 /*
  163  * FAT32 FSInfo block.
  164  */
  165 struct fsinfo {
  166         u_int8_t fsisig1[4];
  167         u_int8_t fsifill1[480];
  168         u_int8_t fsisig2[4];
  169         u_int8_t fsinfree[4];
  170         u_int8_t fsinxtfree[4];
  171         u_int8_t fsifill2[12];
  172         u_int8_t fsisig3[4];
  173 };
  174 #endif /* !_FS_MSDOSFS_BPB_H_ */

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