/*      $OpenBSD: bootsect.h,v 1.8 2025/08/01 13:00:18 jsg Exp $        */
/*      $NetBSD: bootsect.h,v 1.8 1997/10/17 11:23:29 ws 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
 */

/*
 * Format of a boot sector.  This is the first sector on a DOS floppy disk
 * or the first 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[418];        /* pad so structure is 512b */
        u_int8_t        bsBootSectSig2;         /* 2 & 3 are only defined for FAT32? */
        u_int8_t        bsBootSectSig3;
        u_int8_t        bsBootSectSig0;
        u_int8_t        bsBootSectSig1;
#define BOOTSIG0        0x55
#define BOOTSIG1        0xaa
#define BOOTSIG2        0
#define BOOTSIG3        0
};

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