bootsect.h revision 1.1 
1/*	$NetBSD: bootsect.h,v 1.7 1995/07/24 06:36:23 leo Exp $	*/
2
3/*
4 * Written by Paul Popelka (paulp@uts.amdahl.com)
5 *
6 * You can do anything you want with this software, just don't say you wrote
7 * it, and don't remove this notice.
8 *
9 * This software is provided "as is".
10 *
11 * The author supplies this software to be publicly redistributed on the
12 * understanding that the author is not responsible for the correct
13 * functioning of this software in any circumstances and is not liable for
14 * any damages caused by this software.
15 *
16 * October 1992
17 */
18
19/*
20 * Format of a boot sector.  This is the first sector on a DOS floppy disk
21 * or the fist sector of a partition on a hard disk.  But, it is not the
22 * first sector of a partitioned hard disk.
23 */
24struct bootsector33 {
25	u_int8_t	bsJump[3];		/* jump inst E9xxxx or EBxx90 */
26	int8_t		bsOemName[8];		/* OEM name and version */
27	int8_t		bsBPB[19];		/* BIOS parameter block */
28	int8_t		bsDriveNumber;		/* drive number (0x80) */
29	int8_t		bsBootCode[479];	/* pad so struct is 512b */
30	u_int16_t	bsBootSectSig;
31#define	BOOTSIG	0xaa55
32};
33
34struct bootsector50 {
35	u_int8_t	bsJump[3];		/* jump inst E9xxxx or EBxx90 */
36	int8_t		bsOemName[8];		/* OEM name and version */
37	int8_t		bsBPB[25];		/* BIOS parameter block */
38	int8_t		bsDriveNumber;		/* drive number (0x80) */
39	int8_t		bsReserved1;		/* reserved */
40	int8_t		bsBootSignature;	/* ext. boot signature (0x29) */
41#define	EXBOOTSIG	0x29
42	int8_t		bsVolumeID[4];		/* volume ID number */
43	int8_t		bsVolumeLabel[11];	/* volume label */
44	int8_t		bsFileSysType[8];	/* fs type (FAT12 or FAT16) */
45	int8_t		bsBootCode[448];	/* pad so structure is 512b */
46	u_int16_t	bsBootSectSig;
47#define	BOOTSIG	0xaa55
48};
49#ifdef	atari
50/*
51 * The boot sector on a gemdos fs is a little bit different from the msdos fs
52 * format. Currently there is no need to declare a seperate structure, the
53 * bootsector33 struct will do.
54 */
55#if 0
56struct bootsec_atari {
57	u_int8_t	bsBranch[2];		/* branch inst if auto-boot	*/
58	int8_t		bsFiller[6];		/* anything or nothing		*/
59	int8_t		bsSerial[3];		/* serial no. for mediachange	*/
60	int8_t		bsBPB[19];		/* BIOS parameter block		*/
61	int8_t		bsBootCode[482];	/* pad so struct is 512b	*/
62};
63#endif
64#endif /* atari */
65
66union bootsector {
67	struct bootsector33 bs33;
68	struct bootsector50 bs50;
69};
70
71/*
72 * Shorthand for fields in the bpb.
73 */
74#define	bsBytesPerSec	bsBPB.bpbBytesPerSec
75#define	bsSectPerClust	bsBPB.bpbSectPerClust
76#define	bsResSectors	bsBPB.bpbResSectors
77#define	bsFATS		bsBPB.bpbFATS
78#define	bsRootDirEnts	bsBPB.bpbRootDirEnts
79#define	bsSectors	bsBPB.bpbSectors
80#define	bsMedia		bsBPB.bpbMedia
81#define	bsFATsecs	bsBPB.bpbFATsecs
82#define	bsSectPerTrack	bsBPB.bpbSectPerTrack
83#define	bsHeads		bsBPB.bpbHeads
84#define	bsHiddenSecs	bsBPB.bpbHiddenSecs
85#define	bsHugeSectors	bsBPB.bpbHugeSectors
86