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longs larger than 32 bits or strict alignment requirements. pm_fatmask had type u_long, but it must have a type that has precisely 32 bits and this type must be no smaller than int, so that ~pmp->pm_fatmask has no bits above the 31st set. Otherwise, comparisons between (cn | ~pmp->pm_fatmask) and magic 32-bit "cluster" numbers always fail. The correct fix is to use the C99 type uint_least32_t and mask with 0xffffffff. The quick fix is to use u_int32_t and assume that ints have msdosfs metadata is riddled with unaligned fields, and on alphas, unaligned_fixup() apparently has problems fixing up the unaligned accesses caused by this. The quick fix is to not comment out the NetBSD code that sort of handles this, and define UNALIGNED_ACCESS on i386's so that the code doesn't change on i386's. The correct fix would define UNALIGNED_ACCESS in a central machine-dependent header and maybe add some extra cases to unaligned_fixup(). UNALIGNED_ACCESS is also tested in isofs. Submitted by: parts by Mark Abene <phiber@radicalmedia.com> PR: 19086
216 lines
8.0 KiB
C
216 lines
8.0 KiB
C
/* $FreeBSD$ */
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/* $NetBSD: bpb.h,v 1.7 1997/11/17 15:36:24 ws Exp $ */
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/*
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* Written by Paul Popelka (paulp@uts.amdahl.com)
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*
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* You can do anything you want with this software, just don't say you wrote
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* it, and don't remove this notice.
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*
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* This software is provided "as is".
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*
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* The author supplies this software to be publicly redistributed on the
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* understanding that the author is not responsible for the correct
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* functioning of this software in any circumstances and is not liable for
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* any damages caused by this software.
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*
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* October 1992
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*/
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/*
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* BIOS Parameter Block (BPB) for DOS 3.3
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*/
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struct bpb33 {
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u_int16_t bpbBytesPerSec; /* bytes per sector */
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u_int8_t bpbSecPerClust; /* sectors per cluster */
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u_int16_t bpbResSectors; /* number of reserved sectors */
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u_int8_t bpbFATs; /* number of FATs */
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u_int16_t bpbRootDirEnts; /* number of root directory entries */
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u_int16_t bpbSectors; /* total number of sectors */
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u_int8_t bpbMedia; /* media descriptor */
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u_int16_t bpbFATsecs; /* number of sectors per FAT */
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u_int16_t bpbSecPerTrack; /* sectors per track */
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u_int16_t bpbHeads; /* number of heads */
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u_int16_t bpbHiddenSecs; /* number of hidden sectors */
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};
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/*
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* BPB for DOS 5.0 The difference is bpbHiddenSecs is a short for DOS 3.3,
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* and bpbHugeSectors is not in the 3.3 bpb.
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*/
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struct bpb50 {
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u_int16_t bpbBytesPerSec; /* bytes per sector */
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u_int8_t bpbSecPerClust; /* sectors per cluster */
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u_int16_t bpbResSectors; /* number of reserved sectors */
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u_int8_t bpbFATs; /* number of FATs */
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u_int16_t bpbRootDirEnts; /* number of root directory entries */
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u_int16_t bpbSectors; /* total number of sectors */
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u_int8_t bpbMedia; /* media descriptor */
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u_int16_t bpbFATsecs; /* number of sectors per FAT */
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u_int16_t bpbSecPerTrack; /* sectors per track */
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u_int16_t bpbHeads; /* number of heads */
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u_int32_t bpbHiddenSecs; /* # of hidden sectors */
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u_int32_t bpbHugeSectors; /* # of sectors if bpbSectors == 0 */
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};
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/*
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* BPB for DOS 7.10 (FAT32). This one has a few extensions to bpb50.
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*/
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struct bpb710 {
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u_int16_t bpbBytesPerSec; /* bytes per sector */
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u_int8_t bpbSecPerClust; /* sectors per cluster */
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u_int16_t bpbResSectors; /* number of reserved sectors */
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u_int8_t bpbFATs; /* number of FATs */
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u_int16_t bpbRootDirEnts; /* number of root directory entries */
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u_int16_t bpbSectors; /* total number of sectors */
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u_int8_t bpbMedia; /* media descriptor */
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u_int16_t bpbFATsecs; /* number of sectors per FAT */
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u_int16_t bpbSecPerTrack; /* sectors per track */
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u_int16_t bpbHeads; /* number of heads */
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u_int32_t bpbHiddenSecs; /* # of hidden sectors */
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u_int32_t bpbHugeSectors; /* # of sectors if bpbSectors == 0 */
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u_int32_t bpbBigFATsecs; /* like bpbFATsecs for FAT32 */
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u_int16_t bpbExtFlags; /* extended flags: */
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#define FATNUM 0xf /* mask for numbering active FAT */
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#define FATMIRROR 0x80 /* FAT is mirrored (like it always was) */
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u_int16_t bpbFSVers; /* filesystem version */
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#define FSVERS 0 /* currently only 0 is understood */
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u_int32_t bpbRootClust; /* start cluster for root directory */
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u_int16_t bpbFSInfo; /* filesystem info structure sector */
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u_int16_t bpbBackup; /* backup boot sector */
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/* There is a 12 byte filler here, but we ignore it */
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};
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#ifdef atari
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/*
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* BPB for gemdos filesystems. Atari leaves the obsolete stuff undefined.
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* Currently there is no need for a separate BPB structure.
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*/
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#if 0
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struct bpb_a {
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u_int16_t bpbBytesPerSec; /* bytes per sector */
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u_int8_t bpbSecPerClust; /* sectors per cluster */
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u_int16_t bpbResSectors; /* number of reserved sectors */
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u_int8_t bpbFATs; /* number of FATs */
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u_int16_t bpbRootDirEnts; /* number of root directory entries */
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u_int16_t bpbSectors; /* total number of sectors */
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u_int8_t bpbUseless1; /* meaningless on gemdos fs */
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u_int16_t bpbFATsecs; /* number of sectors per FAT */
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u_int16_t bpbUseless2; /* meaningless for harddisk fs */
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u_int16_t bpbUseless3; /* meaningless for harddisk fs */
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u_int16_t bpbHiddenSecs; /* the TOS-BIOS ignores this */
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};
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#endif
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#endif /* atari */
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/*
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* The following structures represent how the bpb's look on disk. shorts
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* and longs are just character arrays of the appropriate length. This is
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* because the compiler forces shorts and longs to align on word or
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* halfword boundaries.
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*
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* XXX The little-endian code here assumes that the processor can access
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* 16-bit and 32-bit quantities on byte boundaries. If this is not true,
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* use the macros for the big-endian case.
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*/
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#include <machine/endian.h>
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#ifdef __i386__
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#define UNLALIGNED_ACCESS
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#endif
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#if (BYTE_ORDER == LITTLE_ENDIAN) && defined(UNALIGNED_ACCESS)
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#define getushort(x) *((u_int16_t *)(x))
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#define getulong(x) *((u_int32_t *)(x))
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#define putushort(p, v) (*((u_int16_t *)(p)) = (v))
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#define putulong(p, v) (*((u_int32_t *)(p)) = (v))
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#else
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#define getushort(x) (((u_int8_t *)(x))[0] + (((u_int8_t *)(x))[1] << 8))
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#define getulong(x) (((u_int8_t *)(x))[0] + (((u_int8_t *)(x))[1] << 8) \
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+ (((u_int8_t *)(x))[2] << 16) \
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+ (((u_int8_t *)(x))[3] << 24))
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#define putushort(p, v) (((u_int8_t *)(p))[0] = (v), \
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((u_int8_t *)(p))[1] = (v) >> 8)
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#define putulong(p, v) (((u_int8_t *)(p))[0] = (v), \
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((u_int8_t *)(p))[1] = (v) >> 8, \
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((u_int8_t *)(p))[2] = (v) >> 16,\
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((u_int8_t *)(p))[3] = (v) >> 24)
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#endif
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/*
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* BIOS Parameter Block (BPB) for DOS 3.3
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*/
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struct byte_bpb33 {
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int8_t bpbBytesPerSec[2]; /* bytes per sector */
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int8_t bpbSecPerClust; /* sectors per cluster */
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int8_t bpbResSectors[2]; /* number of reserved sectors */
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int8_t bpbFATs; /* number of FATs */
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int8_t bpbRootDirEnts[2]; /* number of root directory entries */
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int8_t bpbSectors[2]; /* total number of sectors */
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int8_t bpbMedia; /* media descriptor */
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int8_t bpbFATsecs[2]; /* number of sectors per FAT */
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int8_t bpbSecPerTrack[2]; /* sectors per track */
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int8_t bpbHeads[2]; /* number of heads */
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int8_t bpbHiddenSecs[2]; /* number of hidden sectors */
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};
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/*
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* BPB for DOS 5.0 The difference is bpbHiddenSecs is a short for DOS 3.3,
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* and bpbHugeSectors is not in the 3.3 bpb.
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*/
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struct byte_bpb50 {
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int8_t bpbBytesPerSec[2]; /* bytes per sector */
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int8_t bpbSecPerClust; /* sectors per cluster */
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int8_t bpbResSectors[2]; /* number of reserved sectors */
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int8_t bpbFATs; /* number of FATs */
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int8_t bpbRootDirEnts[2]; /* number of root directory entries */
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int8_t bpbSectors[2]; /* total number of sectors */
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int8_t bpbMedia; /* media descriptor */
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int8_t bpbFATsecs[2]; /* number of sectors per FAT */
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int8_t bpbSecPerTrack[2]; /* sectors per track */
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int8_t bpbHeads[2]; /* number of heads */
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int8_t bpbHiddenSecs[4]; /* number of hidden sectors */
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int8_t bpbHugeSectors[4]; /* # of sectors if bpbSectors == 0 */
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};
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/*
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* BPB for DOS 7.10 (FAT32). This one has a few extensions to bpb50.
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*/
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struct byte_bpb710 {
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u_int8_t bpbBytesPerSec[2]; /* bytes per sector */
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u_int8_t bpbSecPerClust; /* sectors per cluster */
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u_int8_t bpbResSectors[2]; /* number of reserved sectors */
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u_int8_t bpbFATs; /* number of FATs */
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u_int8_t bpbRootDirEnts[2]; /* number of root directory entries */
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u_int8_t bpbSectors[2]; /* total number of sectors */
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u_int8_t bpbMedia; /* media descriptor */
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u_int8_t bpbFATsecs[2]; /* number of sectors per FAT */
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u_int8_t bpbSecPerTrack[2]; /* sectors per track */
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u_int8_t bpbHeads[2]; /* number of heads */
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u_int8_t bpbHiddenSecs[4]; /* # of hidden sectors */
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u_int8_t bpbHugeSectors[4]; /* # of sectors if bpbSectors == 0 */
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u_int8_t bpbBigFATsecs[4]; /* like bpbFATsecs for FAT32 */
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u_int8_t bpbExtFlags[2]; /* extended flags: */
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u_int8_t bpbFSVers[2]; /* filesystem version */
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u_int8_t bpbRootClust[4]; /* start cluster for root directory */
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u_int8_t bpbFSInfo[2]; /* filesystem info structure sector */
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u_int8_t bpbBackup[2]; /* backup boot sector */
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/* There is a 12 byte filler here, but we ignore it */
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};
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/*
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* FAT32 FSInfo block.
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*/
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struct fsinfo {
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u_int8_t fsisig1[4];
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u_int8_t fsifill1[480];
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u_int8_t fsisig2[4];
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u_int8_t fsinfree[4];
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u_int8_t fsinxtfree[4];
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u_int8_t fsifill2[12];
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u_int8_t fsisig3[4];
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u_int8_t fsifill3[508];
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u_int8_t fsisig4[4];
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};
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