150477Speter/* $FreeBSD$ */
233548Sjkh/*	$NetBSD: bpb.h,v 1.7 1997/11/17 15:36:24 ws Exp $	*/
32893Sdfr
4139776Simp/*-
52893Sdfr * Written by Paul Popelka (paulp@uts.amdahl.com)
68876Srgrimes *
72893Sdfr * You can do anything you want with this software, just don't say you wrote
82893Sdfr * it, and don't remove this notice.
98876Srgrimes *
102893Sdfr * This software is provided "as is".
118876Srgrimes *
122893Sdfr * The author supplies this software to be publicly redistributed on the
132893Sdfr * understanding that the author is not responsible for the correct
142893Sdfr * functioning of this software in any circumstances and is not liable for
152893Sdfr * any damages caused by this software.
168876Srgrimes *
172893Sdfr * October 1992
182893Sdfr */
192893Sdfr
20203827Skib#ifndef _FS_MSDOSFS_BPB_H_
21203827Skib#define	_FS_MSDOSFS_BPB_H_
22203827Skib
232893Sdfr/*
242893Sdfr * BIOS Parameter Block (BPB) for DOS 3.3
252893Sdfr */
262893Sdfrstruct bpb33 {
2733548Sjkh	u_int16_t	bpbBytesPerSec;	/* bytes per sector */
2833548Sjkh	u_int8_t	bpbSecPerClust;	/* sectors per cluster */
2933548Sjkh	u_int16_t	bpbResSectors;	/* number of reserved sectors */
3033548Sjkh	u_int8_t	bpbFATs;	/* number of FATs */
3133548Sjkh	u_int16_t	bpbRootDirEnts;	/* number of root directory entries */
3233548Sjkh	u_int16_t	bpbSectors;	/* total number of sectors */
3333548Sjkh	u_int8_t	bpbMedia;	/* media descriptor */
3433548Sjkh	u_int16_t	bpbFATsecs;	/* number of sectors per FAT */
3533548Sjkh	u_int16_t	bpbSecPerTrack;	/* sectors per track */
3633548Sjkh	u_int16_t	bpbHeads;	/* number of heads */
3733548Sjkh	u_int16_t	bpbHiddenSecs;	/* number of hidden sectors */
382893Sdfr};
392893Sdfr
402893Sdfr/*
412893Sdfr * BPB for DOS 5.0 The difference is bpbHiddenSecs is a short for DOS 3.3,
422893Sdfr * and bpbHugeSectors is not in the 3.3 bpb.
432893Sdfr */
442893Sdfrstruct bpb50 {
4533548Sjkh	u_int16_t	bpbBytesPerSec;	/* bytes per sector */
4633548Sjkh	u_int8_t	bpbSecPerClust;	/* sectors per cluster */
4733548Sjkh	u_int16_t	bpbResSectors;	/* number of reserved sectors */
4833548Sjkh	u_int8_t	bpbFATs;	/* number of FATs */
4933548Sjkh	u_int16_t	bpbRootDirEnts;	/* number of root directory entries */
5033548Sjkh	u_int16_t	bpbSectors;	/* total number of sectors */
5133548Sjkh	u_int8_t	bpbMedia;	/* media descriptor */
5233548Sjkh	u_int16_t	bpbFATsecs;	/* number of sectors per FAT */
5333548Sjkh	u_int16_t	bpbSecPerTrack;	/* sectors per track */
5433548Sjkh	u_int16_t	bpbHeads;	/* number of heads */
5533548Sjkh	u_int32_t	bpbHiddenSecs;	/* # of hidden sectors */
5633548Sjkh	u_int32_t	bpbHugeSectors;	/* # of sectors if bpbSectors == 0 */
572893Sdfr};
582893Sdfr
592893Sdfr/*
6033548Sjkh * BPB for DOS 7.10 (FAT32).  This one has a few extensions to bpb50.
6133548Sjkh */
6233548Sjkhstruct bpb710 {
6333548Sjkh	u_int16_t	bpbBytesPerSec;	/* bytes per sector */
6433548Sjkh	u_int8_t	bpbSecPerClust;	/* sectors per cluster */
6533548Sjkh	u_int16_t	bpbResSectors;	/* number of reserved sectors */
6633548Sjkh	u_int8_t	bpbFATs;	/* number of FATs */
6733548Sjkh	u_int16_t	bpbRootDirEnts;	/* number of root directory entries */
6833548Sjkh	u_int16_t	bpbSectors;	/* total number of sectors */
6933548Sjkh	u_int8_t	bpbMedia;	/* media descriptor */
7033548Sjkh	u_int16_t	bpbFATsecs;	/* number of sectors per FAT */
7133548Sjkh	u_int16_t	bpbSecPerTrack;	/* sectors per track */
7233548Sjkh	u_int16_t	bpbHeads;	/* number of heads */
7333548Sjkh	u_int32_t	bpbHiddenSecs;	/* # of hidden sectors */
7433548Sjkh	u_int32_t	bpbHugeSectors;	/* # of sectors if bpbSectors == 0 */
7533548Sjkh	u_int32_t	bpbBigFATsecs;	/* like bpbFATsecs for FAT32 */
7633548Sjkh	u_int16_t	bpbExtFlags;	/* extended flags: */
7733548Sjkh#define	FATNUM		0xf		/* mask for numbering active FAT */
7833548Sjkh#define	FATMIRROR	0x80		/* FAT is mirrored (like it always was) */
7933548Sjkh	u_int16_t	bpbFSVers;	/* filesystem version */
8033548Sjkh#define	FSVERS		0		/* currently only 0 is understood */
8133548Sjkh	u_int32_t	bpbRootClust;	/* start cluster for root directory */
8233548Sjkh	u_int16_t	bpbFSInfo;	/* filesystem info structure sector */
8333548Sjkh	u_int16_t	bpbBackup;	/* backup boot sector */
84203827Skib	u_int8_t	bpbReserved[12]; /* reserved for future expansion */
8533548Sjkh};
8633548Sjkh
8733548Sjkh/*
882893Sdfr * The following structures represent how the bpb's look on disk.  shorts
892893Sdfr * and longs are just character arrays of the appropriate length.  This is
902893Sdfr * because the compiler forces shorts and longs to align on word or
912893Sdfr * halfword boundaries.
922893Sdfr */
9365075Sbde
94165431Smarcel#include <sys/endian.h>
9565075Sbde
96165431Smarcel#define	getushort(x)	le16dec(x)
97165431Smarcel#define	getulong(x)	le32dec(x)
98165431Smarcel#define	putushort(p, v)	le16enc(p, v)
99165431Smarcel#define	putulong(p, v)	le32enc(p, v)
1002893Sdfr
1012893Sdfr/*
1022893Sdfr * BIOS Parameter Block (BPB) for DOS 3.3
1032893Sdfr */
1042893Sdfrstruct byte_bpb33 {
10533548Sjkh	int8_t bpbBytesPerSec[2];	/* bytes per sector */
10633548Sjkh	int8_t bpbSecPerClust;		/* sectors per cluster */
10733548Sjkh	int8_t bpbResSectors[2];	/* number of reserved sectors */
10833548Sjkh	int8_t bpbFATs;			/* number of FATs */
10933548Sjkh	int8_t bpbRootDirEnts[2];	/* number of root directory entries */
11033548Sjkh	int8_t bpbSectors[2];		/* total number of sectors */
11133548Sjkh	int8_t bpbMedia;		/* media descriptor */
11233548Sjkh	int8_t bpbFATsecs[2];		/* number of sectors per FAT */
11333548Sjkh	int8_t bpbSecPerTrack[2];	/* sectors per track */
11433548Sjkh	int8_t bpbHeads[2];		/* number of heads */
11533548Sjkh	int8_t bpbHiddenSecs[2];	/* number of hidden sectors */
1162893Sdfr};
1172893Sdfr
1182893Sdfr/*
1192893Sdfr * BPB for DOS 5.0 The difference is bpbHiddenSecs is a short for DOS 3.3,
1202893Sdfr * and bpbHugeSectors is not in the 3.3 bpb.
1212893Sdfr */
1222893Sdfrstruct byte_bpb50 {
12333548Sjkh	int8_t bpbBytesPerSec[2];	/* bytes per sector */
12433548Sjkh	int8_t bpbSecPerClust;		/* sectors per cluster */
12533548Sjkh	int8_t bpbResSectors[2];	/* number of reserved sectors */
12633548Sjkh	int8_t bpbFATs;			/* number of FATs */
12733548Sjkh	int8_t bpbRootDirEnts[2];	/* number of root directory entries */
12833548Sjkh	int8_t bpbSectors[2];		/* total number of sectors */
12933548Sjkh	int8_t bpbMedia;		/* media descriptor */
13033548Sjkh	int8_t bpbFATsecs[2];		/* number of sectors per FAT */
13133548Sjkh	int8_t bpbSecPerTrack[2];	/* sectors per track */
13233548Sjkh	int8_t bpbHeads[2];		/* number of heads */
13333548Sjkh	int8_t bpbHiddenSecs[4];	/* number of hidden sectors */
13433548Sjkh	int8_t bpbHugeSectors[4];	/* # of sectors if bpbSectors == 0 */
1352893Sdfr};
13633548Sjkh
13733548Sjkh/*
13833548Sjkh * BPB for DOS 7.10 (FAT32).  This one has a few extensions to bpb50.
13933548Sjkh */
14033548Sjkhstruct byte_bpb710 {
14133548Sjkh	u_int8_t bpbBytesPerSec[2];	/* bytes per sector */
14233548Sjkh	u_int8_t bpbSecPerClust;	/* sectors per cluster */
14333548Sjkh	u_int8_t bpbResSectors[2];	/* number of reserved sectors */
14433548Sjkh	u_int8_t bpbFATs;		/* number of FATs */
14533548Sjkh	u_int8_t bpbRootDirEnts[2];	/* number of root directory entries */
14633548Sjkh	u_int8_t bpbSectors[2];		/* total number of sectors */
14733548Sjkh	u_int8_t bpbMedia;		/* media descriptor */
14833548Sjkh	u_int8_t bpbFATsecs[2];		/* number of sectors per FAT */
14933548Sjkh	u_int8_t bpbSecPerTrack[2];	/* sectors per track */
15033548Sjkh	u_int8_t bpbHeads[2];		/* number of heads */
15133548Sjkh	u_int8_t bpbHiddenSecs[4];	/* # of hidden sectors */
15233548Sjkh	u_int8_t bpbHugeSectors[4];	/* # of sectors if bpbSectors == 0 */
15333548Sjkh	u_int8_t bpbBigFATsecs[4];	/* like bpbFATsecs for FAT32 */
15433548Sjkh	u_int8_t bpbExtFlags[2];	/* extended flags: */
15533548Sjkh	u_int8_t bpbFSVers[2];		/* filesystem version */
15633548Sjkh	u_int8_t bpbRootClust[4];	/* start cluster for root directory */
15733548Sjkh	u_int8_t bpbFSInfo[2];		/* filesystem info structure sector */
15833548Sjkh	u_int8_t bpbBackup[2];		/* backup boot sector */
159203827Skib	u_int8_t bpbReserved[12];	/* reserved for future expansion */
16033548Sjkh};
16133548Sjkh
16233548Sjkh/*
16333548Sjkh * FAT32 FSInfo block.
16433548Sjkh */
16533548Sjkhstruct fsinfo {
16633548Sjkh	u_int8_t fsisig1[4];
16733548Sjkh	u_int8_t fsifill1[480];
16833548Sjkh	u_int8_t fsisig2[4];
16933548Sjkh	u_int8_t fsinfree[4];
17033548Sjkh	u_int8_t fsinxtfree[4];
17133548Sjkh	u_int8_t fsifill2[12];
17233548Sjkh	u_int8_t fsisig3[4];
17333548Sjkh};
174203827Skib#endif /* !_FS_MSDOSFS_BPB_H_ */
175