/* $NetBSD: bootsect.h,v 1.7 2021/08/09 21:38:05 andvar Exp $ */
/*
* Written by Paul Popelka (
[email protected])
*
* 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 first sector of a partition on a hard disk. But, it is not the
* first sector of a partitioned hard disk.
*/
struct bootsector33 {
uint8_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 */
uint8_t bsBootSectSig0;
uint8_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 {
uint8_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 */
uint8_t bsBootSectSig0;
uint8_t bsBootSectSig1;
#define BOOTSIG0 0x55
#define BOOTSIG1 0xaa
};
struct bootsector710 {
uint8_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 */
uint8_t bsBootSectSig0;
uint8_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 {
uint8_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_ */
