bootsect.h

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    1 /*      $NetBSD: bootsect.h,v 1.2 2003/10/06 02:21:47 lukem Exp $       */
    2 
    3 /*
    4  * Written by Paul Popelka (paulp@uts.amdahl.com)
    5  *
    6  * You can do anything you want with this software, just don't say you wrote
    7  * it, and don't remove this notice.
    8  *
    9  * This software is provided "as is".
   10  *
   11  * The author supplies this software to be publicly redistributed on the
   12  * understanding that the author is not responsible for the correct
   13  * functioning of this software in any circumstances and is not liable for
   14  * any damages caused by this software.
   15  *
   16  * October 1992
   17  */
   18 
   19 /*
   20  * Format of a boot sector.  This is the first sector on a DOS floppy disk
   21  * or the fist sector of a partition on a hard disk.  But, it is not the
   22  * first sector of a partitioned hard disk.
   23  */
   24 struct bootsector33 {
   25         u_int8_t        bsJump[3];              /* jump inst E9xxxx or EBxx90 */
   26         int8_t          bsOemName[8];           /* OEM name and version */
   27         int8_t          bsBPB[19];              /* BIOS parameter block */
   28         int8_t          bsDriveNumber;          /* drive number (0x80) */
   29         int8_t          bsBootCode[479];        /* pad so struct is 512b */
   30         u_int8_t        bsBootSectSig0;
   31         u_int8_t        bsBootSectSig1;
   32 #define BOOTSIG0        0x55
   33 #define BOOTSIG1        0xaa
   34 };
   35 
   36 struct extboot {
   37         int8_t          exDriveNumber;          /* drive number (0x80) */
   38         int8_t          exReserved1;            /* reserved */
   39         int8_t          exBootSignature;        /* ext. boot signature (0x29) */
   40 #define EXBOOTSIG       0x29
   41         int8_t          exVolumeID[4];          /* volume ID number */
   42         int8_t          exVolumeLabel[11];      /* volume label */
   43         int8_t          exFileSysType[8];       /* fs type (FAT12 or FAT16) */
   44 };
   45 
   46 struct bootsector50 {
   47         u_int8_t        bsJump[3];              /* jump inst E9xxxx or EBxx90 */
   48         int8_t          bsOemName[8];           /* OEM name and version */
   49         int8_t          bsBPB[25];              /* BIOS parameter block */
   50         int8_t          bsExt[26];              /* Bootsector Extension */
   51         int8_t          bsBootCode[448];        /* pad so structure is 512b */
   52         u_int8_t        bsBootSectSig0;
   53         u_int8_t        bsBootSectSig1;
   54 #define BOOTSIG0        0x55
   55 #define BOOTSIG1        0xaa
   56 };
   57 
   58 struct bootsector710 {
   59         u_int8_t        bsJump[3];              /* jump inst E9xxxx or EBxx90 */
   60         int8_t          bsOEMName[8];           /* OEM name and version */
   61         int8_t          bsBPB[53];              /* BIOS parameter block */
   62         int8_t          bsExt[26];              /* Bootsector Extension */
   63         int8_t          bsBootCode[418];        /* pad so structure is 512b */
   64         u_int8_t        bsBootSectSig2;         /* 2 & 3 are only defined for FAT32? */
   65         u_int8_t        bsBootSectSig3;
   66         u_int8_t        bsBootSectSig0;
   67         u_int8_t        bsBootSectSig1;
   68 #define BOOTSIG0        0x55
   69 #define BOOTSIG1        0xaa
   70 #define BOOTSIG2        0
   71 #define BOOTSIG3        0
   72 };
   73 #ifdef  atari
   74 /*
   75  * The boot sector on a gemdos fs is a little bit different from the msdos fs
   76  * format. Currently there is no need to declare a separate structure, the
   77  * bootsector33 struct will do.
   78  */
   79 #if 0
   80 struct bootsec_atari {
   81         u_int8_t        bsBranch[2];            /* branch inst if auto-boot     */
   82         int8_t          bsFiller[6];            /* anything or nothing          */
   83         int8_t          bsSerial[3];            /* serial no. for mediachange   */
   84         int8_t          bsBPB[19];              /* BIOS parameter block         */
   85         int8_t          bsBootCode[482];        /* pad so struct is 512b        */
   86 };
   87 #endif
   88 #endif /* atari */
   89 
   90 union bootsector {
   91         struct bootsector33 bs33;
   92         struct bootsector50 bs50;
   93         struct bootsector710 bs710;
   94 };
   95 
   96 #if 0
   97 /*
   98  * Shorthand for fields in the bpb.
   99  */
  100 #define bsBytesPerSec   bsBPB.bpbBytesPerSec
  101 #define bsSectPerClust  bsBPB.bpbSectPerClust
  102 #define bsResSectors    bsBPB.bpbResSectors
  103 #define bsFATS          bsBPB.bpbFATS
  104 #define bsRootDirEnts   bsBPB.bpbRootDirEnts
  105 #define bsSectors       bsBPB.bpbSectors
  106 #define bsMedia         bsBPB.bpbMedia
  107 #define bsFATsecs       bsBPB.bpbFATsecs
  108 #define bsSectPerTrack  bsBPB.bpbSectPerTrack
  109 #define bsHeads         bsBPB.bpbHeads
  110 #define bsHiddenSecs    bsBPB.bpbHiddenSecs
  111 #define bsHugeSectors   bsBPB.bpbHugeSectors
  112 #endif

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FreeBSD/Linux Kernel Cross Reference sys/fs/msdosfs/bootsect.h

FreeBSD/Linux Kernel Cross Reference
sys/fs/msdosfs/bootsect.h