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Annotation of Net2/pcfs/bootsect.h, revision 1.1

1.1     ! root        1: /*
        !             2:  *  Written by Paul Popelka ([email protected])
        !             3:  *
        !             4:  *  You can do anything you want with this software,
        !             5:  *    just don't say you wrote it,
        !             6:  *    and don't remove this notice.
        !             7:  *
        !             8:  *  This software is provided "as is".
        !             9:  *
        !            10:  *  The author supplies this software to be publicly
        !            11:  *  redistributed on the understanding that the author
        !            12:  *  is not responsible for the correct functioning of
        !            13:  *  this software in any circumstances and is not liable
        !            14:  *  for any damages caused by this software.
        !            15:  *
        !            16:  *  October 1992
        !            17:  *
        !            18:  *     bootsect.h,v 1.2 1993/05/20 03:34:02 cgd Exp
        !            19:  */
        !            20: 
        !            21: /*
        !            22:  *  Format of a boot sector.  This is the first sector
        !            23:  *  on a DOS floppy disk or the fist sector of a partition
        !            24:  *  on a hard disk.  But, it is not the first sector of
        !            25:  *  a partitioned hard disk.
        !            26:  */
        !            27: struct bootsector33 {
        !            28:        char bsJump[3];         /* jump instruction E9xxxx or EBxx90    */
        !            29:        char bsOemName[8];      /* OEM name and version                 */
        !            30:        char bsBPB[19];         /* BIOS parameter block                 */
        !            31:        char bsDriveNumber;     /* drive number (0x80)                  */
        !            32:        char bsBootCode[474];   /* pad so structure is 512 bytes long   */
        !            33:        u_short bsBootSectSig;
        !            34: #define        BOOTSIG 0xaa55
        !            35: };
        !            36: 
        !            37: struct bootsector50 {
        !            38:        char bsJump[3];         /* jump instruction E9xxxx or EBxx90    */
        !            39:        char bsOemName[8];      /* OEM name and version                 */
        !            40:        char bsBPB[25];         /* BIOS parameter block                 */
        !            41:        char bsDriveNumber;     /* drive number (0x80)                  */
        !            42:        char bsReserved1;       /* reserved                             */
        !            43:        char bsBootSignature;   /* extended boot signature (0x29)       */
        !            44: #define        EXBOOTSIG       0x29
        !            45:        char bsVolumeID[4];     /* volume ID number                     */
        !            46:        char bsVolumeLabel[11]; /* volume label                         */
        !            47:        char bsFileSysType[8];  /* file system type (FAT12 or FAT16)    */
        !            48:        char bsBootCode[448];   /* pad so structure is 512 bytes long   */
        !            49:        u_short bsBootSectSig;
        !            50: #define        BOOTSIG 0xaa55
        !            51: };
        !            52: 
        !            53: union bootsector {
        !            54:        struct bootsector33 bs33;
        !            55:        struct bootsector50 bs50;
        !            56: };
        !            57: 
        !            58: /*
        !            59:  *  Shorthand for fields in the bpb.
        !            60:  */
        !            61: #define        bsBytesPerSec   bsBPB.bpbBytesPerSec
        !            62: #define        bsSectPerClust  bsBPB.bpbSectPerClust
        !            63: #define        bsResSectors    bsBPB.bpbResSectors
        !            64: #define        bsFATS          bsBPB.bpbFATS
        !            65: #define        bsRootDirEnts   bsBPB.bpbRootDirEnts
        !            66: #define        bsSectors       bsBPB.bpbSectors
        !            67: #define        bsMedia         bsBPB.bpbMedia
        !            68: #define        bsFATsecs       bsBPB.bpbFATsecs
        !            69: #define        bsSectPerTrack  bsBPB.bpbSectPerTrack
        !            70: #define        bsHeads         bsBPB.bpbHeads
        !            71: #define        bsHiddenSecs    bsBPB.bpbHiddenSecs
        !            72: #define        bsHugeSectors   bsBPB.bpbHugeSectors

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