LCOM1920-T02G10

/*        $NetBSD: bootsect.h,v 1.5 2012/11/04 17:57:59 jakllsch Exp $        */

/*

 * Written by Paul Popelka (paulp@uts.amdahl.com)

 *

 * 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_BOOTSECT_H_

#define _MSDOSFS_BOOTSECT_H_

/*

 * Format of a boot sector.  This is the first sector on a DOS floppy disk

 * or the fist sector of a partition on a hard disk.  But, it is not the

 * first sector of a partitioned hard disk.

 */

struct bootsector33 {

        u_int8_t        bsJump[3];                /* jump inst E9xxxx or EBxx90 */

        int8_t                bsOemName[8];                /* OEM name and version */

        int8_t                bsBPB[19];                /* BIOS parameter block */

        int8_t                bsDriveNumber;                /* drive number (0x80) */

        int8_t                bsBootCode[479];        /* pad so struct is 512b */

        u_int8_t        bsBootSectSig0;

        u_int8_t        bsBootSectSig1;

#define        BOOTSIG0        0x55

#define        BOOTSIG1        0xaa

};

struct extboot {

        int8_t                exDriveNumber;                /* drive number (0x80) */

        int8_t                exReserved1;                /* reserved */

        int8_t                exBootSignature;        /* ext. boot signature (0x29) */

#define        EXBOOTSIG        0x29

        int8_t                exVolumeID[4];                /* volume ID number */

        int8_t                exVolumeLabel[11];        /* volume label */

        int8_t                exFileSysType[8];        /* fs type (FAT12 or FAT16) */

};

struct bootsector50 {

        u_int8_t        bsJump[3];                /* jump inst E9xxxx or EBxx90 */

        int8_t                bsOemName[8];                /* OEM name and version */

        int8_t                bsBPB[25];                /* BIOS parameter block */

        int8_t                bsExt[26];                /* Bootsector Extension */

        int8_t                bsBootCode[448];        /* pad so structure is 512b */

        u_int8_t        bsBootSectSig0;

        u_int8_t        bsBootSectSig1;

#define        BOOTSIG0        0x55

#define        BOOTSIG1        0xaa

};

struct bootsector710 {

        u_int8_t        bsJump[3];                /* jump inst E9xxxx or EBxx90 */

        int8_t                bsOEMName[8];                /* OEM name and version */

        int8_t                bsBPB[53];                /* BIOS parameter block */

        int8_t                bsExt[26];                /* Bootsector Extension */

        int8_t                bsBootCode[420];        /* pad so structure is 512b */

        u_int8_t        bsBootSectSig0;

        u_int8_t        bsBootSectSig1;

#define        BOOTSIG0        0x55

#define        BOOTSIG1        0xaa

};

#ifdef        atari

/*

 * The boot sector on a GEMDOS FS is a little bit different from the MSDOS FS

 * format. Currently there is no need to declare a separate structure, the

 * bootsector33 struct will do.

 */

#if 0

struct bootsec_atari {

        u_int8_t        bsBranch[2];                /* branch inst if auto-boot        */

        int8_t                bsFiller[6];                /* anything or nothing                */

        int8_t                bsSerial[3];                /* serial no. for mediachange        */

        int8_t                bsBPB[19];                /* BIOS parameter block                */

        int8_t                bsBootCode[482];        /* pad so struct is 512b        */

};

#endif

#endif /* atari */

union bootsector {

        struct bootsector33 bs33;

        struct bootsector50 bs50;

        struct bootsector710 bs710;

};

#if 0

/*

 * Shorthand for fields in the bpb.

 */

#define        bsBytesPerSec        bsBPB.bpbBytesPerSec

#define        bsSectPerClust        bsBPB.bpbSectPerClust

#define        bsResSectors        bsBPB.bpbResSectors

#define        bsFATS                bsBPB.bpbFATS

#define        bsRootDirEnts        bsBPB.bpbRootDirEnts

#define        bsSectors        bsBPB.bpbSectors

#define        bsMedia                bsBPB.bpbMedia

#define        bsFATsecs        bsBPB.bpbFATsecs

#define        bsSectPerTrack        bsBPB.bpbSectPerTrack

#define        bsHeads                bsBPB.bpbHeads

#define        bsHiddenSecs        bsBPB.bpbHiddenSecs

#define        bsHugeSectors        bsBPB.bpbHugeSectors

#endif

#endif /* _MSDOSFS_BOOTSECT_H_ */