bootsect.h   [plain text]


/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/* $FreeBSD: src/sys/msdosfs/bootsect.h,v 1.7 1999/08/28 00:48:06 peter Exp $ */
/*	$NetBSD: bootsect.h,v 1.9 1997/11/17 15:36:17 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 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
};

union bootsector {
	struct bootsector33 bs33;
	struct bootsector50 bs50;
	struct bootsector710 bs710;
};