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Diffstat (limited to 'sys/fs/msdosfs/bpb.h')
| -rw-r--r-- | sys/fs/msdosfs/bpb.h | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/sys/fs/msdosfs/bpb.h b/sys/fs/msdosfs/bpb.h new file mode 100644 index 000000000000..682974fb780c --- /dev/null +++ b/sys/fs/msdosfs/bpb.h @@ -0,0 +1,174 @@ +/* $FreeBSD$ */ +/* $NetBSD: bpb.h,v 1.7 1997/11/17 15:36:24 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 + */ + +#ifndef _FS_MSDOSFS_BPB_H_ +#define _FS_MSDOSFS_BPB_H_ + +/* + * BIOS Parameter Block (BPB) for DOS 3.3 + */ +struct bpb33 { + uint16_t bpbBytesPerSec; /* bytes per sector */ + uint8_t bpbSecPerClust; /* sectors per cluster */ + uint16_t bpbResSectors; /* number of reserved sectors */ + uint8_t bpbFATs; /* number of FATs */ + uint16_t bpbRootDirEnts; /* number of root directory entries */ + uint16_t bpbSectors; /* total number of sectors */ + uint8_t bpbMedia; /* media descriptor */ + uint16_t bpbFATsecs; /* number of sectors per FAT */ + uint16_t bpbSecPerTrack; /* sectors per track */ + uint16_t bpbHeads; /* number of heads */ + uint16_t bpbHiddenSecs; /* number of hidden sectors */ +}; + +/* + * BPB for DOS 5.0 The difference is bpbHiddenSecs is a short for DOS 3.3, + * and bpbHugeSectors is not in the 3.3 bpb. + */ +struct bpb50 { + uint16_t bpbBytesPerSec; /* bytes per sector */ + uint8_t bpbSecPerClust; /* sectors per cluster */ + uint16_t bpbResSectors; /* number of reserved sectors */ + uint8_t bpbFATs; /* number of FATs */ + uint16_t bpbRootDirEnts; /* number of root directory entries */ + uint16_t bpbSectors; /* total number of sectors */ + uint8_t bpbMedia; /* media descriptor */ + uint16_t bpbFATsecs; /* number of sectors per FAT */ + uint16_t bpbSecPerTrack; /* sectors per track */ + uint16_t bpbHeads; /* number of heads */ + uint32_t bpbHiddenSecs; /* # of hidden sectors */ + uint32_t bpbHugeSectors; /* # of sectors if bpbSectors == 0 */ +}; + +/* + * BPB for DOS 7.10 (FAT32). This one has a few extensions to bpb50. + */ +struct bpb710 { + uint16_t bpbBytesPerSec; /* bytes per sector */ + uint8_t bpbSecPerClust; /* sectors per cluster */ + uint16_t bpbResSectors; /* number of reserved sectors */ + uint8_t bpbFATs; /* number of FATs */ + uint16_t bpbRootDirEnts; /* number of root directory entries */ + uint16_t bpbSectors; /* total number of sectors */ + uint8_t bpbMedia; /* media descriptor */ + uint16_t bpbFATsecs; /* number of sectors per FAT */ + uint16_t bpbSecPerTrack; /* sectors per track */ + uint16_t bpbHeads; /* number of heads */ + uint32_t bpbHiddenSecs; /* # of hidden sectors */ + uint32_t bpbHugeSectors; /* # of sectors if bpbSectors == 0 */ + uint32_t bpbBigFATsecs; /* like bpbFATsecs for FAT32 */ + uint16_t bpbExtFlags; /* extended flags: */ +#define FATNUM 0xf /* mask for numbering active FAT */ +#define FATMIRROR 0x80 /* FAT is mirrored (like it always was) */ + uint16_t bpbFSVers; /* filesystem version */ +#define FSVERS 0 /* currently only 0 is understood */ + uint32_t bpbRootClust; /* start cluster for root directory */ + uint16_t bpbFSInfo; /* filesystem info structure sector */ + uint16_t bpbBackup; /* backup boot sector */ + uint8_t bpbReserved[12]; /* reserved for future expansion */ +}; + +/* + * The following structures represent how the bpb's look on disk. shorts + * and longs are just character arrays of the appropriate length. This is + * because the compiler forces shorts and longs to align on word or + * halfword boundaries. + */ + +#include <sys/endian.h> + +#define getushort(x) le16dec(x) +#define getulong(x) le32dec(x) +#define putushort(p, v) le16enc(p, v) +#define putulong(p, v) le32enc(p, v) + +/* + * BIOS Parameter Block (BPB) for DOS 3.3 + */ +struct byte_bpb33 { + int8_t bpbBytesPerSec[2]; /* bytes per sector */ + int8_t bpbSecPerClust; /* sectors per cluster */ + int8_t bpbResSectors[2]; /* number of reserved sectors */ + int8_t bpbFATs; /* number of FATs */ + int8_t bpbRootDirEnts[2]; /* number of root directory entries */ + int8_t bpbSectors[2]; /* total number of sectors */ + int8_t bpbMedia; /* media descriptor */ + int8_t bpbFATsecs[2]; /* number of sectors per FAT */ + int8_t bpbSecPerTrack[2]; /* sectors per track */ + int8_t bpbHeads[2]; /* number of heads */ + int8_t bpbHiddenSecs[2]; /* number of hidden sectors */ +}; + +/* + * BPB for DOS 5.0 The difference is bpbHiddenSecs is a short for DOS 3.3, + * and bpbHugeSectors is not in the 3.3 bpb. + */ +struct byte_bpb50 { + int8_t bpbBytesPerSec[2]; /* bytes per sector */ + int8_t bpbSecPerClust; /* sectors per cluster */ + int8_t bpbResSectors[2]; /* number of reserved sectors */ + int8_t bpbFATs; /* number of FATs */ + int8_t bpbRootDirEnts[2]; /* number of root directory entries */ + int8_t bpbSectors[2]; /* total number of sectors */ + int8_t bpbMedia; /* media descriptor */ + int8_t bpbFATsecs[2]; /* number of sectors per FAT */ + int8_t bpbSecPerTrack[2]; /* sectors per track */ + int8_t bpbHeads[2]; /* number of heads */ + int8_t bpbHiddenSecs[4]; /* number of hidden sectors */ + int8_t bpbHugeSectors[4]; /* # of sectors if bpbSectors == 0 */ +}; + +/* + * BPB for DOS 7.10 (FAT32). This one has a few extensions to bpb50. + */ +struct byte_bpb710 { + uint8_t bpbBytesPerSec[2]; /* bytes per sector */ + uint8_t bpbSecPerClust; /* sectors per cluster */ + uint8_t bpbResSectors[2]; /* number of reserved sectors */ + uint8_t bpbFATs; /* number of FATs */ + uint8_t bpbRootDirEnts[2]; /* number of root directory entries */ + uint8_t bpbSectors[2]; /* total number of sectors */ + uint8_t bpbMedia; /* media descriptor */ + uint8_t bpbFATsecs[2]; /* number of sectors per FAT */ + uint8_t bpbSecPerTrack[2]; /* sectors per track */ + uint8_t bpbHeads[2]; /* number of heads */ + uint8_t bpbHiddenSecs[4]; /* # of hidden sectors */ + uint8_t bpbHugeSectors[4]; /* # of sectors if bpbSectors == 0 */ + uint8_t bpbBigFATsecs[4]; /* like bpbFATsecs for FAT32 */ + uint8_t bpbExtFlags[2]; /* extended flags: */ + uint8_t bpbFSVers[2]; /* filesystem version */ + uint8_t bpbRootClust[4]; /* start cluster for root directory */ + uint8_t bpbFSInfo[2]; /* filesystem info structure sector */ + uint8_t bpbBackup[2]; /* backup boot sector */ + uint8_t bpbReserved[12]; /* reserved for future expansion */ +}; + +/* + * FAT32 FSInfo block. + */ +struct fsinfo { + uint8_t fsisig1[4]; + uint8_t fsifill1[480]; + uint8_t fsisig2[4]; + uint8_t fsinfree[4]; + uint8_t fsinxtfree[4]; + uint8_t fsifill2[12]; + uint8_t fsisig3[4]; +}; +#endif /* !_FS_MSDOSFS_BPB_H_ */ |