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 /*
   21  * BIOS Parameter Block (BPB) for DOS 3.3
   22  */
   23 struct bpb33 {
   24         u_int16_t       bpbBytesPerSec; /* bytes per sector */
   25         u_int8_t        bpbSecPerClust; /* sectors per cluster */
   26         u_int16_t       bpbResSectors;  /* number of reserved sectors */
   27         u_int8_t        bpbFATs;        /* number of FATs */
   28         u_int16_t       bpbRootDirEnts; /* number of root directory entries */
   29         u_int16_t       bpbSectors;     /* total number of sectors */
   30         u_int8_t        bpbMedia;       /* media descriptor */
   31         u_int16_t       bpbFATsecs;     /* number of sectors per FAT */
   32         u_int16_t       bpbSecPerTrack; /* sectors per track */
   33         u_int16_t       bpbHeads;       /* number of heads */
   34         u_int16_t       bpbHiddenSecs;  /* number of hidden sectors */
   35 };
   36 
   37 /*
   38  * BPB for DOS 5.0 The difference is bpbHiddenSecs is a short for DOS 3.3,
   39  * and bpbHugeSectors is not in the 3.3 bpb.
   40  */
   41 struct bpb50 {
   42         u_int16_t       bpbBytesPerSec; /* bytes per sector */
   43         u_int8_t        bpbSecPerClust; /* sectors per cluster */
   44         u_int16_t       bpbResSectors;  /* number of reserved sectors */
   45         u_int8_t        bpbFATs;        /* number of FATs */
   46         u_int16_t       bpbRootDirEnts; /* number of root directory entries */
   47         u_int16_t       bpbSectors;     /* total number of sectors */
   48         u_int8_t        bpbMedia;       /* media descriptor */
   49         u_int16_t       bpbFATsecs;     /* number of sectors per FAT */
   50         u_int16_t       bpbSecPerTrack; /* sectors per track */
   51         u_int16_t       bpbHeads;       /* number of heads */
   52         u_int32_t       bpbHiddenSecs;  /* # of hidden sectors */
   53         u_int32_t       bpbHugeSectors; /* # of sectors if bpbSectors == 0 */
   54 };
   55 
   56 /*
   57  * BPB for DOS 7.10 (FAT32).  This one has a few extensions to bpb50.
   58  */
   59 struct bpb710 {
   60         u_int16_t       bpbBytesPerSec; /* bytes per sector */
   61         u_int8_t        bpbSecPerClust; /* sectors per cluster */
   62         u_int16_t       bpbResSectors;  /* number of reserved sectors */
   63         u_int8_t        bpbFATs;        /* number of FATs */
   64         u_int16_t       bpbRootDirEnts; /* number of root directory entries */
   65         u_int16_t       bpbSectors;     /* total number of sectors */
   66         u_int8_t        bpbMedia;       /* media descriptor */
   67         u_int16_t       bpbFATsecs;     /* number of sectors per FAT */
   68         u_int16_t       bpbSecPerTrack; /* sectors per track */
   69         u_int16_t       bpbHeads;       /* number of heads */
   70         u_int32_t       bpbHiddenSecs;  /* # of hidden sectors */
   71         u_int32_t       bpbHugeSectors; /* # of sectors if bpbSectors == 0 */
   72         u_int32_t       bpbBigFATsecs;  /* like bpbFATsecs for FAT32 */
   73         u_int16_t       bpbExtFlags;    /* extended flags: */
   74 #define FATNUM          0xf             /* mask for numbering active FAT */
   75 #define FATMIRROR       0x80            /* FAT is mirrored (like it always was) */
   76         u_int16_t       bpbFSVers;      /* filesystem version */
   77 #define FSVERS          0               /* currently only 0 is understood */
   78         u_int32_t       bpbRootClust;   /* start cluster for root directory */
   79         u_int16_t       bpbFSInfo;      /* filesystem info structure sector */
   80         u_int16_t       bpbBackup;      /* backup boot sector */
   81         /* There is a 12 byte filler here, but we ignore it */
   82 };
   83 
   84 /*
   85  * The following structures represent how the bpb's look on disk.  shorts
   86  * and longs are just character arrays of the appropriate length.  This is
   87  * because the compiler forces shorts and longs to align on word or
   88  * halfword boundaries.
   89  */
   90 
   91 #include <sys/endian.h>
   92 
   93 #define getushort(x)    le16dec(x)
   94 #define getulong(x)     le32dec(x)
   95 #define putushort(p, v) le16enc(p, v)
   96 #define putulong(p, v)  le32enc(p, v)
   97 
   98 /*
   99  * BIOS Parameter Block (BPB) for DOS 3.3
  100  */
  101 struct byte_bpb33 {
  102         int8_t bpbBytesPerSec[2];       /* bytes per sector */
  103         int8_t bpbSecPerClust;          /* sectors per cluster */
  104         int8_t bpbResSectors[2];        /* number of reserved sectors */
  105         int8_t bpbFATs;                 /* number of FATs */
  106         int8_t bpbRootDirEnts[2];       /* number of root directory entries */
  107         int8_t bpbSectors[2];           /* total number of sectors */
  108         int8_t bpbMedia;                /* media descriptor */
  109         int8_t bpbFATsecs[2];           /* number of sectors per FAT */
  110         int8_t bpbSecPerTrack[2];       /* sectors per track */
  111         int8_t bpbHeads[2];             /* number of heads */
  112         int8_t bpbHiddenSecs[2];        /* number of hidden sectors */
  113 };
  114 
  115 /*
  116  * BPB for DOS 5.0 The difference is bpbHiddenSecs is a short for DOS 3.3,
  117  * and bpbHugeSectors is not in the 3.3 bpb.
  118  */
  119 struct byte_bpb50 {
  120         int8_t bpbBytesPerSec[2];       /* bytes per sector */
  121         int8_t bpbSecPerClust;          /* sectors per cluster */
  122         int8_t bpbResSectors[2];        /* number of reserved sectors */
  123         int8_t bpbFATs;                 /* number of FATs */
  124         int8_t bpbRootDirEnts[2];       /* number of root directory entries */
  125         int8_t bpbSectors[2];           /* total number of sectors */
  126         int8_t bpbMedia;                /* media descriptor */
  127         int8_t bpbFATsecs[2];           /* number of sectors per FAT */
  128         int8_t bpbSecPerTrack[2];       /* sectors per track */
  129         int8_t bpbHeads[2];             /* number of heads */
  130         int8_t bpbHiddenSecs[4];        /* number of hidden sectors */
  131         int8_t bpbHugeSectors[4];       /* # of sectors if bpbSectors == 0 */
  132 };
  133 
  134 /*
  135  * BPB for DOS 7.10 (FAT32).  This one has a few extensions to bpb50.
  136  */
  137 struct byte_bpb710 {
  138         u_int8_t bpbBytesPerSec[2];     /* bytes per sector */
  139         u_int8_t bpbSecPerClust;        /* sectors per cluster */
  140         u_int8_t bpbResSectors[2];      /* number of reserved sectors */
  141         u_int8_t bpbFATs;               /* number of FATs */
  142         u_int8_t bpbRootDirEnts[2];     /* number of root directory entries */
  143         u_int8_t bpbSectors[2];         /* total number of sectors */
  144         u_int8_t bpbMedia;              /* media descriptor */
  145         u_int8_t bpbFATsecs[2];         /* number of sectors per FAT */
  146         u_int8_t bpbSecPerTrack[2];     /* sectors per track */
  147         u_int8_t bpbHeads[2];           /* number of heads */
  148         u_int8_t bpbHiddenSecs[4];      /* # of hidden sectors */
  149         u_int8_t bpbHugeSectors[4];     /* # of sectors if bpbSectors == 0 */
  150         u_int8_t bpbBigFATsecs[4];      /* like bpbFATsecs for FAT32 */
  151         u_int8_t bpbExtFlags[2];        /* extended flags: */
  152         u_int8_t bpbFSVers[2];          /* filesystem version */
  153         u_int8_t bpbRootClust[4];       /* start cluster for root directory */
  154         u_int8_t bpbFSInfo[2];          /* filesystem info structure sector */
  155         u_int8_t bpbBackup[2];          /* backup boot sector */
  156         /* There is a 12 byte filler here, but we ignore it */
  157 };
  158 
  159 /*
  160  * FAT32 FSInfo block.
  161  */
  162 struct fsinfo {
  163         u_int8_t fsisig1[4];
  164         u_int8_t fsifill1[480];
  165         u_int8_t fsisig2[4];
  166         u_int8_t fsinfree[4];
  167         u_int8_t fsinxtfree[4];
  168         u_int8_t fsifill2[12];
  169         u_int8_t fsisig3[4];
  170 };

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