bootsect.h revision 272461 
1/* $FreeBSD: releng/10.1/sys/fs/msdosfs/bootsect.h 203827 2010-02-13 12:41:07Z kib $ */
2/*	$NetBSD: bootsect.h,v 1.9 1997/11/17 15:36:17 ws Exp $	*/
3
4/*-
5 * Written by Paul Popelka (paulp@uts.amdahl.com)
6 *
7 * You can do anything you want with this software, just don't say you wrote
8 * it, and don't remove this notice.
9 *
10 * This software is provided "as is".
11 *
12 * The author supplies this software to be publicly redistributed on the
13 * understanding that the author is not responsible for the correct
14 * functioning of this software in any circumstances and is not liable for
15 * any damages caused by this software.
16 *
17 * October 1992
18 */
19#ifndef _FS_MSDOSFS_BOOTSECT_H_
20#define	_FS_MSDOSFS_BOOTSECT_H_
21
22/*
23 * Format of a boot sector.  This is the first sector on a DOS floppy disk
24 * or the fist sector of a partition on a hard disk.  But, it is not the
25 * first sector of a partitioned hard disk.
26 */
27struct bootsector33 {
28	u_int8_t	bsJump[3];		/* jump inst E9xxxx or EBxx90 */
29	int8_t		bsOemName[8];		/* OEM name and version */
30	int8_t		bsBPB[19];		/* BIOS parameter block */
31	int8_t		bsDriveNumber;		/* drive number (0x80) */
32	int8_t		bsBootCode[479];	/* pad so struct is 512b */
33	u_int8_t	bsBootSectSig0;
34	u_int8_t	bsBootSectSig1;
35#define	BOOTSIG0	0x55
36#define	BOOTSIG1	0xaa
37};
38
39struct extboot {
40	int8_t		exDriveNumber;		/* drive number (0x80) */
41	int8_t		exReserved1;		/* reserved */
42	int8_t		exBootSignature;	/* ext. boot signature (0x29) */
43#define	EXBOOTSIG	0x29
44	int8_t		exVolumeID[4];		/* volume ID number */
45	int8_t		exVolumeLabel[11];	/* volume label */
46	int8_t		exFileSysType[8];	/* fs type (FAT12 or FAT16) */
47};
48
49struct bootsector50 {
50	u_int8_t	bsJump[3];		/* jump inst E9xxxx or EBxx90 */
51	int8_t		bsOemName[8];		/* OEM name and version */
52	int8_t		bsBPB[25];		/* BIOS parameter block */
53	int8_t		bsExt[26];		/* Bootsector Extension */
54	int8_t		bsBootCode[448];	/* pad so structure is 512b */
55	u_int8_t	bsBootSectSig0;
56	u_int8_t	bsBootSectSig1;
57#define	BOOTSIG0	0x55
58#define	BOOTSIG1	0xaa
59};
60
61struct bootsector710 {
62	u_int8_t	bsJump[3];		/* jump inst E9xxxx or EBxx90 */
63	int8_t		bsOEMName[8];		/* OEM name and version */
64	int8_t		bsBPB[53];		/* BIOS parameter block */
65	int8_t		bsExt[26];		/* Bootsector Extension */
66	int8_t		bsBootCode[420];	/* pad so structure is 512b */
67	u_int8_t	bsBootSectSig0;
68	u_int8_t	bsBootSectSig1;
69#define	BOOTSIG0	0x55
70#define	BOOTSIG1	0xaa
71};
72
73union bootsector {
74	struct bootsector33 bs33;
75	struct bootsector50 bs50;
76	struct bootsector710 bs710;
77};
78
79#if 0
80/*
81 * Shorthand for fields in the bpb.
82 */
83#define	bsBytesPerSec	bsBPB.bpbBytesPerSec
84#define	bsSectPerClust	bsBPB.bpbSectPerClust
85#define	bsResSectors	bsBPB.bpbResSectors
86#define	bsFATS		bsBPB.bpbFATS
87#define	bsRootDirEnts	bsBPB.bpbRootDirEnts
88#define	bsSectors	bsBPB.bpbSectors
89#define	bsMedia		bsBPB.bpbMedia
90#define	bsFATsecs	bsBPB.bpbFATsecs
91#define	bsSectPerTrack	bsBPB.bpbSectPerTrack
92#define	bsHeads		bsBPB.bpbHeads
93#define	bsHiddenSecs	bsBPB.bpbHiddenSecs
94#define	bsHugeSectors	bsBPB.bpbHugeSectors
95#endif
96
97#endif /* !_FS_MSDOSFS_BOOTSECT_H_ */
98