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Diffstat (limited to 'sys/fs/msdosfs/bpb.h')
| -rw-r--r-- | sys/fs/msdosfs/bpb.h | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/sys/fs/msdosfs/bpb.h b/sys/fs/msdosfs/bpb.h new file mode 100644 index 0000000..88b9eef --- /dev/null +++ b/sys/fs/msdosfs/bpb.h @@ -0,0 +1,209 @@ +/* $FreeBSD$ */ +/* $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 + */ + +/* + * BIOS Parameter Block (BPB) for DOS 3.3 + */ +struct bpb33 { + u_int16_t bpbBytesPerSec; /* bytes per sector */ + u_int8_t bpbSecPerClust; /* sectors per cluster */ + u_int16_t bpbResSectors; /* number of reserved sectors */ + u_int8_t bpbFATs; /* number of FATs */ + u_int16_t bpbRootDirEnts; /* number of root directory entries */ + u_int16_t bpbSectors; /* total number of sectors */ + u_int8_t bpbMedia; /* media descriptor */ + u_int16_t bpbFATsecs; /* number of sectors per FAT */ + u_int16_t bpbSecPerTrack; /* sectors per track */ + u_int16_t bpbHeads; /* number of heads */ + u_int16_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 { + u_int16_t bpbBytesPerSec; /* bytes per sector */ + u_int8_t bpbSecPerClust; /* sectors per cluster */ + u_int16_t bpbResSectors; /* number of reserved sectors */ + u_int8_t bpbFATs; /* number of FATs */ + u_int16_t bpbRootDirEnts; /* number of root directory entries */ + u_int16_t bpbSectors; /* total number of sectors */ + u_int8_t bpbMedia; /* media descriptor */ + u_int16_t bpbFATsecs; /* number of sectors per FAT */ + u_int16_t bpbSecPerTrack; /* sectors per track */ + u_int16_t bpbHeads; /* number of heads */ + u_int32_t bpbHiddenSecs; /* # of hidden sectors */ + u_int32_t bpbHugeSectors; /* # of sectors if bpbSectors == 0 */ +}; + +/* + * BPB for DOS 7.10 (FAT32). This one has a few extensions to bpb50. + */ +struct bpb710 { + u_int16_t bpbBytesPerSec; /* bytes per sector */ + u_int8_t bpbSecPerClust; /* sectors per cluster */ + u_int16_t bpbResSectors; /* number of reserved sectors */ + u_int8_t bpbFATs; /* number of FATs */ + u_int16_t bpbRootDirEnts; /* number of root directory entries */ + u_int16_t bpbSectors; /* total number of sectors */ + u_int8_t bpbMedia; /* media descriptor */ + u_int16_t bpbFATsecs; /* number of sectors per FAT */ + u_int16_t bpbSecPerTrack; /* sectors per track */ + u_int16_t bpbHeads; /* number of heads */ + u_int32_t bpbHiddenSecs; /* # of hidden sectors */ + u_int32_t bpbHugeSectors; /* # of sectors if bpbSectors == 0 */ + u_int32_t bpbBigFATsecs; /* like bpbFATsecs for FAT32 */ + u_int16_t bpbExtFlags; /* extended flags: */ +#define FATNUM 0xf /* mask for numbering active FAT */ +#define FATMIRROR 0x80 /* FAT is mirrored (like it always was) */ + u_int16_t bpbFSVers; /* filesystem version */ +#define FSVERS 0 /* currently only 0 is understood */ + u_int32_t bpbRootClust; /* start cluster for root directory */ + u_int16_t bpbFSInfo; /* filesystem info structure sector */ + u_int16_t bpbBackup; /* backup boot sector */ + /* There is a 12 byte filler here, but we ignore it */ +}; + +#ifdef atari +/* + * BPB for gemdos filesystems. Atari leaves the obsolete stuff undefined. + * Currently there is no need for a separate BPB structure. + */ +#if 0 +struct bpb_a { + u_int16_t bpbBytesPerSec; /* bytes per sector */ + u_int8_t bpbSecPerClust; /* sectors per cluster */ + u_int16_t bpbResSectors; /* number of reserved sectors */ + u_int8_t bpbFATs; /* number of FATs */ + u_int16_t bpbRootDirEnts; /* number of root directory entries */ + u_int16_t bpbSectors; /* total number of sectors */ + u_int8_t bpbUseless1; /* meaningless on gemdos fs */ + u_int16_t bpbFATsecs; /* number of sectors per FAT */ + u_int16_t bpbUseless2; /* meaningless for harddisk fs */ + u_int16_t bpbUseless3; /* meaningless for harddisk fs */ + u_int16_t bpbHiddenSecs; /* the TOS-BIOS ignores this */ +}; +#endif +#endif /* atari */ + +/* + * 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. + * + * XXX The little-endian code here assumes that the processor can access + * 16-bit and 32-bit quantities on byte boundaries. If this is not true, + * use the macros for the big-endian case. + */ +#include <machine/endian.h> +#if (BYTE_ORDER == LITTLE_ENDIAN) /* && defined(UNALIGNED_ACCESS) */ +#define getushort(x) *((u_int16_t *)(x)) +#define getulong(x) *((u_int32_t *)(x)) +#define putushort(p, v) (*((u_int16_t *)(p)) = (v)) +#define putulong(p, v) (*((u_int32_t *)(p)) = (v)) +#else +#define getushort(x) (((u_int8_t *)(x))[0] + (((u_int8_t *)(x))[1] << 8)) +#define getulong(x) (((u_int8_t *)(x))[0] + (((u_int8_t *)(x))[1] << 8) \ + + (((u_int8_t *)(x))[2] << 16) \ + + (((u_int8_t *)(x))[3] << 24)) +#define putushort(p, v) (((u_int8_t *)(p))[0] = (v), \ + ((u_int8_t *)(p))[1] = (v) >> 8) +#define putulong(p, v) (((u_int8_t *)(p))[0] = (v), \ + ((u_int8_t *)(p))[1] = (v) >> 8, \ + ((u_int8_t *)(p))[2] = (v) >> 16,\ + ((u_int8_t *)(p))[3] = (v) >> 24) +#endif + +/* + * 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 { + u_int8_t bpbBytesPerSec[2]; /* bytes per sector */ + u_int8_t bpbSecPerClust; /* sectors per cluster */ + u_int8_t bpbResSectors[2]; /* number of reserved sectors */ + u_int8_t bpbFATs; /* number of FATs */ + u_int8_t bpbRootDirEnts[2]; /* number of root directory entries */ + u_int8_t bpbSectors[2]; /* total number of sectors */ + u_int8_t bpbMedia; /* media descriptor */ + u_int8_t bpbFATsecs[2]; /* number of sectors per FAT */ + u_int8_t bpbSecPerTrack[2]; /* sectors per track */ + u_int8_t bpbHeads[2]; /* number of heads */ + u_int8_t bpbHiddenSecs[4]; /* # of hidden sectors */ + u_int8_t bpbHugeSectors[4]; /* # of sectors if bpbSectors == 0 */ + u_int8_t bpbBigFATsecs[4]; /* like bpbFATsecs for FAT32 */ + u_int8_t bpbExtFlags[2]; /* extended flags: */ + u_int8_t bpbFSVers[2]; /* filesystem version */ + u_int8_t bpbRootClust[4]; /* start cluster for root directory */ + u_int8_t bpbFSInfo[2]; /* filesystem info structure sector */ + u_int8_t bpbBackup[2]; /* backup boot sector */ + /* There is a 12 byte filler here, but we ignore it */ +}; + +/* + * FAT32 FSInfo block. + */ +struct fsinfo { + u_int8_t fsisig1[4]; + u_int8_t fsifill1[480]; + u_int8_t fsisig2[4]; + u_int8_t fsinfree[4]; + u_int8_t fsinxtfree[4]; + u_int8_t fsifill2[12]; + u_int8_t fsisig3[4]; + u_int8_t fsifill3[508]; + u_int8_t fsisig4[4]; +}; |
