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      1  1.8  dholland /*	$NetBSD: bpb.h,v 1.8 2016/01/22 22:53:36 dholland Exp $	*/
      2  1.1  jdolecek 
      3  1.1  jdolecek /*
      4  1.1  jdolecek  * Written by Paul Popelka (paulp (at) uts.amdahl.com)
      5  1.1  jdolecek  *
      6  1.1  jdolecek  * You can do anything you want with this software, just don't say you wrote
      7  1.1  jdolecek  * it, and don't remove this notice.
      8  1.1  jdolecek  *
      9  1.1  jdolecek  * This software is provided "as is".
     10  1.1  jdolecek  *
     11  1.1  jdolecek  * The author supplies this software to be publicly redistributed on the
     12  1.1  jdolecek  * understanding that the author is not responsible for the correct
     13  1.1  jdolecek  * functioning of this software in any circumstances and is not liable for
     14  1.1  jdolecek  * any damages caused by this software.
     15  1.1  jdolecek  *
     16  1.1  jdolecek  * October 1992
     17  1.1  jdolecek  */
     18  1.1  jdolecek 
     19  1.4  christos #ifndef _MSDOSFS_BPB_H_
     20  1.4  christos #define _MSDOSFS_BPB_H_
     21  1.4  christos 
     22  1.1  jdolecek /*
     23  1.1  jdolecek  * BIOS Parameter Block (BPB) for DOS 3.3
     24  1.1  jdolecek  */
     25  1.1  jdolecek struct bpb33 {
     26  1.8  dholland 	uint16_t	bpbBytesPerSec;	/* bytes per sector */
     27  1.8  dholland 	uint8_t		bpbSecPerClust;	/* sectors per cluster */
     28  1.8  dholland 	uint16_t	bpbResSectors;	/* number of reserved sectors */
     29  1.8  dholland 	uint8_t		bpbFATs;	/* number of FATs */
     30  1.8  dholland 	uint16_t	bpbRootDirEnts;	/* number of root directory entries */
     31  1.8  dholland 	uint16_t	bpbSectors;	/* total number of sectors */
     32  1.8  dholland 	uint8_t		bpbMedia;	/* media descriptor */
     33  1.8  dholland 	uint16_t	bpbFATsecs;	/* number of sectors per FAT */
     34  1.8  dholland 	uint16_t	bpbSecPerTrack;	/* sectors per track */
     35  1.8  dholland 	uint16_t	bpbHeads;	/* number of heads */
     36  1.8  dholland 	uint16_t	bpbHiddenSecs;	/* number of hidden sectors */
     37  1.1  jdolecek };
     38  1.1  jdolecek 
     39  1.1  jdolecek /*
     40  1.1  jdolecek  * BPB for DOS 5.0 The difference is bpbHiddenSecs is a short for DOS 3.3,
     41  1.1  jdolecek  * and bpbHugeSectors is not in the 3.3 bpb.
     42  1.1  jdolecek  */
     43  1.1  jdolecek struct bpb50 {
     44  1.8  dholland 	uint16_t	bpbBytesPerSec;	/* bytes per sector */
     45  1.8  dholland 	uint8_t		bpbSecPerClust;	/* sectors per cluster */
     46  1.8  dholland 	uint16_t	bpbResSectors;	/* number of reserved sectors */
     47  1.8  dholland 	uint8_t		bpbFATs;	/* number of FATs */
     48  1.8  dholland 	uint16_t	bpbRootDirEnts;	/* number of root directory entries */
     49  1.8  dholland 	uint16_t	bpbSectors;	/* total number of sectors */
     50  1.8  dholland 	uint8_t		bpbMedia;	/* media descriptor */
     51  1.8  dholland 	uint16_t	bpbFATsecs;	/* number of sectors per FAT */
     52  1.8  dholland 	uint16_t	bpbSecPerTrack;	/* sectors per track */
     53  1.8  dholland 	uint16_t	bpbHeads;	/* number of heads */
     54  1.8  dholland 	uint32_t	bpbHiddenSecs;	/* # of hidden sectors */
     55  1.8  dholland 	uint32_t	bpbHugeSectors;	/* # of sectors if bpbSectors == 0 */
     56  1.1  jdolecek };
     57  1.1  jdolecek 
     58  1.1  jdolecek /*
     59  1.1  jdolecek  * BPB for DOS 7.10 (FAT32).  This one has a few extensions to bpb50.
     60  1.1  jdolecek  */
     61  1.1  jdolecek struct bpb710 {
     62  1.8  dholland 	uint16_t	bpbBytesPerSec;	/* bytes per sector */
     63  1.8  dholland 	uint8_t		bpbSecPerClust;	/* sectors per cluster */
     64  1.8  dholland 	uint16_t	bpbResSectors;	/* number of reserved sectors */
     65  1.8  dholland 	uint8_t		bpbFATs;	/* number of FATs */
     66  1.8  dholland 	uint16_t	bpbRootDirEnts;	/* number of root directory entries */
     67  1.8  dholland 	uint16_t	bpbSectors;	/* total number of sectors */
     68  1.8  dholland 	uint8_t		bpbMedia;	/* media descriptor */
     69  1.8  dholland 	uint16_t	bpbFATsecs;	/* number of sectors per FAT */
     70  1.8  dholland 	uint16_t	bpbSecPerTrack;	/* sectors per track */
     71  1.8  dholland 	uint16_t	bpbHeads;	/* number of heads */
     72  1.8  dholland 	uint32_t	bpbHiddenSecs;	/* # of hidden sectors */
     73  1.8  dholland 	uint32_t	bpbHugeSectors;	/* # of sectors if bpbSectors == 0 */
     74  1.8  dholland 	uint32_t	bpbBigFATsecs;	/* like bpbFATsecs for FAT32 */
     75  1.8  dholland 	uint16_t	bpbExtFlags;	/* extended flags: */
     76  1.1  jdolecek #define	FATNUM		0xf		/* mask for numbering active FAT */
     77  1.1  jdolecek #define	FATMIRROR	0x80		/* FAT is mirrored (like it always was) */
     78  1.8  dholland 	uint16_t	bpbFSVers;	/* filesystem version */
     79  1.1  jdolecek #define	FSVERS		0		/* currently only 0 is understood */
     80  1.8  dholland 	uint32_t	bpbRootClust;	/* start cluster for root directory */
     81  1.8  dholland 	uint16_t	bpbFSInfo;	/* filesystem info structure sector */
     82  1.8  dholland 	uint16_t	bpbBackup;	/* backup boot sector */
     83  1.8  dholland 	uint8_t		bpbReserved[12]; /* Reserved for future expansion */
     84  1.1  jdolecek };
     85  1.1  jdolecek 
     86  1.1  jdolecek #ifdef	atari
     87  1.1  jdolecek /*
     88  1.7  jakllsch  * BPB for GEMDOS filesystems. Atari leaves the obsolete stuff undefined.
     89  1.1  jdolecek  * Currently there is no need for a separate BPB structure.
     90  1.1  jdolecek  */
     91  1.1  jdolecek #if 0
     92  1.1  jdolecek struct bpb_a {
     93  1.8  dholland 	uint16_t	bpbBytesPerSec;	/* bytes per sector		*/
     94  1.8  dholland 	uint8_t		bpbSecPerClust;	/* sectors per cluster		*/
     95  1.8  dholland 	uint16_t	bpbResSectors;	/* number of reserved sectors	*/
     96  1.8  dholland 	uint8_t		bpbFATs;	/* number of FATs		*/
     97  1.8  dholland 	uint16_t	bpbRootDirEnts;	/* number of root directory entries */
     98  1.8  dholland 	uint16_t	bpbSectors;	/* total number of sectors	*/
     99  1.8  dholland 	uint8_t		bpbUseless1;	/* meaningless on GEMDOS FS	*/
    100  1.8  dholland 	uint16_t	bpbFATsecs;	/* number of sectors per FAT	*/
    101  1.8  dholland 	uint16_t	bpbUseless2;	/* meaningless for harddisk fs	*/
    102  1.8  dholland 	uint16_t	bpbUseless3;	/* meaningless for harddisk fs	*/
    103  1.8  dholland 	uint16_t	bpbHiddenSecs;	/* the TOS-BIOS ignores this	*/
    104  1.1  jdolecek };
    105  1.1  jdolecek #endif
    106  1.1  jdolecek #endif	/* atari */
    107  1.1  jdolecek 
    108  1.1  jdolecek /*
    109  1.1  jdolecek  * The following structures represent how the bpb's look on disk.  shorts
    110  1.1  jdolecek  * and longs are just character arrays of the appropriate length.  This is
    111  1.1  jdolecek  * because the compiler forces shorts and longs to align on word or
    112  1.1  jdolecek  * halfword boundaries.
    113  1.6    cbiere  */
    114  1.6    cbiere 
    115  1.6    cbiere #include <sys/endian.h>
    116  1.6    cbiere 
    117  1.6    cbiere #define	getushort(p)	le16dec(p)
    118  1.6    cbiere #define	getulong(p)	le32dec(p)
    119  1.6    cbiere #define	putushort(p, v) le16enc((p), (v))
    120  1.6    cbiere #define	putulong(p, v)	le32enc((p), (v))
    121  1.1  jdolecek 
    122  1.1  jdolecek /*
    123  1.1  jdolecek  * BIOS Parameter Block (BPB) for DOS 3.3
    124  1.1  jdolecek  */
    125  1.1  jdolecek struct byte_bpb33 {
    126  1.1  jdolecek 	int8_t bpbBytesPerSec[2];	/* bytes per sector */
    127  1.1  jdolecek 	int8_t bpbSecPerClust;		/* sectors per cluster */
    128  1.1  jdolecek 	int8_t bpbResSectors[2];	/* number of reserved sectors */
    129  1.1  jdolecek 	int8_t bpbFATs;			/* number of FATs */
    130  1.1  jdolecek 	int8_t bpbRootDirEnts[2];	/* number of root directory entries */
    131  1.1  jdolecek 	int8_t bpbSectors[2];		/* total number of sectors */
    132  1.1  jdolecek 	int8_t bpbMedia;		/* media descriptor */
    133  1.1  jdolecek 	int8_t bpbFATsecs[2];		/* number of sectors per FAT */
    134  1.1  jdolecek 	int8_t bpbSecPerTrack[2];	/* sectors per track */
    135  1.1  jdolecek 	int8_t bpbHeads[2];		/* number of heads */
    136  1.1  jdolecek 	int8_t bpbHiddenSecs[2];	/* number of hidden sectors */
    137  1.1  jdolecek };
    138  1.1  jdolecek 
    139  1.1  jdolecek /*
    140  1.1  jdolecek  * BPB for DOS 5.0 The difference is bpbHiddenSecs is a short for DOS 3.3,
    141  1.1  jdolecek  * and bpbHugeSectors is not in the 3.3 bpb.
    142  1.1  jdolecek  */
    143  1.1  jdolecek struct byte_bpb50 {
    144  1.1  jdolecek 	int8_t bpbBytesPerSec[2];	/* bytes per sector */
    145  1.1  jdolecek 	int8_t bpbSecPerClust;		/* sectors per cluster */
    146  1.1  jdolecek 	int8_t bpbResSectors[2];	/* number of reserved sectors */
    147  1.1  jdolecek 	int8_t bpbFATs;			/* number of FATs */
    148  1.1  jdolecek 	int8_t bpbRootDirEnts[2];	/* number of root directory entries */
    149  1.1  jdolecek 	int8_t bpbSectors[2];		/* total number of sectors */
    150  1.1  jdolecek 	int8_t bpbMedia;		/* media descriptor */
    151  1.1  jdolecek 	int8_t bpbFATsecs[2];		/* number of sectors per FAT */
    152  1.1  jdolecek 	int8_t bpbSecPerTrack[2];	/* sectors per track */
    153  1.1  jdolecek 	int8_t bpbHeads[2];		/* number of heads */
    154  1.1  jdolecek 	int8_t bpbHiddenSecs[4];	/* number of hidden sectors */
    155  1.1  jdolecek 	int8_t bpbHugeSectors[4];	/* # of sectors if bpbSectors == 0 */
    156  1.1  jdolecek };
    157  1.1  jdolecek 
    158  1.1  jdolecek /*
    159  1.1  jdolecek  * BPB for DOS 7.10 (FAT32).  This one has a few extensions to bpb50.
    160  1.1  jdolecek  */
    161  1.1  jdolecek struct byte_bpb710 {
    162  1.8  dholland 	uint8_t bpbBytesPerSec[2];	/* bytes per sector */
    163  1.8  dholland 	uint8_t bpbSecPerClust;		/* sectors per cluster */
    164  1.8  dholland 	uint8_t bpbResSectors[2];	/* number of reserved sectors */
    165  1.8  dholland 	uint8_t bpbFATs;		/* number of FATs */
    166  1.8  dholland 	uint8_t bpbRootDirEnts[2];	/* number of root directory entries */
    167  1.8  dholland 	uint8_t bpbSectors[2];		/* total number of sectors */
    168  1.8  dholland 	uint8_t bpbMedia;		/* media descriptor */
    169  1.8  dholland 	uint8_t bpbFATsecs[2];		/* number of sectors per FAT */
    170  1.8  dholland 	uint8_t bpbSecPerTrack[2];	/* sectors per track */
    171  1.8  dholland 	uint8_t bpbHeads[2];		/* number of heads */
    172  1.8  dholland 	uint8_t bpbHiddenSecs[4];	/* # of hidden sectors */
    173  1.8  dholland 	uint8_t bpbHugeSectors[4];	/* # of sectors if bpbSectors == 0 */
    174  1.8  dholland 	uint8_t bpbBigFATsecs[4];	/* like bpbFATsecs for FAT32 */
    175  1.8  dholland 	uint8_t bpbExtFlags[2];		/* extended flags: */
    176  1.8  dholland 	uint8_t bpbFSVers[2];		/* filesystem version */
    177  1.8  dholland 	uint8_t bpbRootClust[4];	/* start cluster for root directory */
    178  1.8  dholland 	uint8_t bpbFSInfo[2];		/* filesystem info structure sector */
    179  1.8  dholland 	uint8_t bpbBackup[2];		/* backup boot sector */
    180  1.8  dholland 	uint8_t bpbReserved[12];	/* Reserved for future expansion */
    181  1.1  jdolecek };
    182  1.1  jdolecek 
    183  1.1  jdolecek /*
    184  1.1  jdolecek  * FAT32 FSInfo block.
    185  1.1  jdolecek  */
    186  1.1  jdolecek struct fsinfo {
    187  1.8  dholland 	uint8_t fsisig1[4];
    188  1.8  dholland 	uint8_t fsifill1[480];
    189  1.8  dholland 	uint8_t fsisig2[4];
    190  1.8  dholland 	uint8_t fsinfree[4];
    191  1.8  dholland 	uint8_t fsinxtfree[4];
    192  1.8  dholland 	uint8_t fsifill2[12];
    193  1.8  dholland 	uint8_t fsisig3[4];
    194  1.8  dholland 	uint8_t fsifill3[508];
    195  1.8  dholland 	uint8_t fsisig4[4];
    196  1.1  jdolecek };
    197  1.4  christos #endif /* _MSDOSFS_BPB_H_ */
    198