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/* $NetBSD: bootsect.h,v 1.7 1995/07/24 06:36:23 leo 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 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_int16_t bsBootSectSig;
#define BOOTSIG 0xaa55
};
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 bsDriveNumber; /* drive number (0x80) */
int8_t bsReserved1; /* reserved */
int8_t bsBootSignature; /* ext. boot signature (0x29) */
#define EXBOOTSIG 0x29
int8_t bsVolumeID[4]; /* volume ID number */
int8_t bsVolumeLabel[11]; /* volume label */
int8_t bsFileSysType[8]; /* fs type (FAT12 or FAT16) */
int8_t bsBootCode[448]; /* pad so structure is 512b */
u_int16_t bsBootSectSig;
#define BOOTSIG 0xaa55
};
#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 seperate 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;
};
/*
* 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
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