/*- * Copyright (c) 1994 Bruce D. Evans. * All rights reserved. * * Copyright (c) 1982, 1986, 1988 Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * from: @(#)ufs_disksubr.c 7.16 (Berkeley) 5/4/91 * from: ufs_disksubr.c,v 1.8 1994/06/07 01:21:39 phk Exp $ * $FreeBSD: src/sys/kern/subr_diskmbr.c,v 1.45 2000/01/28 10:22:07 bde Exp $ */ #include #include #include #include #include #define DOSPTYP_EXTENDED 5 #define DOSPTYP_EXTENDEDX 15 #define DOSPTYP_ONTRACK 84 #include #include #include #include #include #define TRACE(str) do { if (dsi_debug) kprintf str; } while (0) static volatile u_char dsi_debug; /* * This is what we have embedded in every boot1 for supporting the bogus * "Dangerously Dedicated" mode. However, the old table is broken because * it has an illegal geometry in it - it specifies 256 heads (heads = end * head + 1) which causes nasty stuff when that wraps to zero in bios code. * eg: divide by zero etc. This caused the dead-thinkpad problem, numerous * SCSI bios crashes, EFI to crash, etc. * * We still have to recognize the old table though, even though we stopped * inflicting it upon the world. */ static struct dos_partition historical_bogus_partition_table[NDOSPART] = { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, { 0x80, 0, 1, 0, DOSPTYP_DFLYBSD, 255, 255, 255, 0, 50000, }, }; static struct dos_partition historical_bogus_partition_table_fixed[NDOSPART] = { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, { 0x80, 0, 1, 0, DOSPTYP_DFLYBSD, 254, 255, 255, 0, 50000, }, }; static int check_part (char *sname, struct dos_partition *dp, u_int64_t offset, int nsectors, int ntracks, u_int64_t mbr_offset); static void mbr_extended (cdev_t dev, struct disk_info *info, struct diskslices *ssp, u_int64_t ext_offset, u_int64_t ext_size, u_int64_t base_ext_offset, int nsectors, int ntracks, u_int64_t mbr_offset, int level); static int mbr_setslice (char *sname, struct disk_info *info, struct diskslice *sp, struct dos_partition *dp, u_int64_t br_offset); int mbrinit(cdev_t dev, struct disk_info *info, struct diskslices **sspp) { struct buf *bp; u_char *cp; int dospart; struct dos_partition *dp; struct dos_partition *dp0; struct dos_partition dpcopy[NDOSPART]; int error; int max_ncyls; int max_nsectors; int max_ntracks; u_int64_t mbr_offset; char partname[2]; u_long secpercyl; char *sname = "tempname"; struct diskslice *sp; struct diskslices *ssp; cdev_t wdev; mbr_offset = DOSBBSECTOR; reread_mbr: /* * Don't bother if the block size is weird or the * media size is 0 (probably means no media present). */ if (info->d_media_blksize & DEV_BMASK) return (EIO); if (info->d_media_size == 0) return (EIO); /* * Read master boot record. */ wdev = dev; bp = getpbuf_mem(NULL); KKASSERT((int)info->d_media_blksize <= bp->b_bufsize); bp->b_bio1.bio_offset = (off_t)mbr_offset * info->d_media_blksize; bp->b_bio1.bio_done = biodone_sync; bp->b_bio1.bio_flags |= BIO_SYNC; bp->b_bcount = info->d_media_blksize; bp->b_cmd = BUF_CMD_READ; bp->b_flags |= B_FAILONDIS; dev_dstrategy(wdev, &bp->b_bio1); if (biowait(&bp->b_bio1, "mbrrd") != 0) { if ((info->d_dsflags & DSO_MBRQUIET) == 0) { diskerr(&bp->b_bio1, wdev, "reading primary partition table: error", LOG_PRINTF, 0); kprintf("\n"); } error = EIO; goto done; } /* Weakly verify it. */ cp = bp->b_data; sname = dsname(dev, 0, 0, 0, NULL); if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) { if (bootverbose) kprintf("%s: invalid primary partition table: no magic\n", sname); error = EINVAL; goto done; } /* Make a copy of the partition table to avoid alignment problems. */ memcpy(&dpcopy[0], cp + DOSPARTOFF, sizeof(dpcopy)); dp0 = &dpcopy[0]; /* * Check for "Ontrack Diskmanager" or GPT. If a GPT is found in * the first dos partition, ignore the rest of the MBR and go * to GPT processing. */ for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) { if (dospart == 0 && dp->dp_typ == DOSPTYP_PMBR) { if (bootverbose) kprintf( "%s: Found GPT in slice #%d\n", sname, dospart + 1); error = gptinit(dev, info, sspp); goto done; } if (dp->dp_typ == DOSPTYP_ONTRACK) { if (bootverbose) kprintf( "%s: Found \"Ontrack Disk Manager\" on this disk.\n", sname); bp->b_flags |= B_INVAL | B_AGE; brelse(bp); mbr_offset = 63; goto reread_mbr; } } if (bcmp(dp0, historical_bogus_partition_table, sizeof historical_bogus_partition_table) == 0 || bcmp(dp0, historical_bogus_partition_table_fixed, sizeof historical_bogus_partition_table_fixed) == 0) { #if 0 TRACE(("%s: invalid primary partition table: historical\n", sname)); #endif /* 0 */ if (bootverbose) kprintf( "%s: invalid primary partition table: Dangerously Dedicated (ignored)\n", sname); error = EINVAL; goto done; } /* Guess the geometry. */ /* * TODO: * Perhaps skip entries with 0 size. * Perhaps only look at entries of type DOSPTYP_386BSD or * DOSPTYP_DFLYBSD */ max_ncyls = 0; max_nsectors = 0; max_ntracks = 0; for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) { int ncyls; int nsectors; int ntracks; ncyls = DPCYL(dp->dp_ecyl, dp->dp_esect) + 1; if (max_ncyls < ncyls) max_ncyls = ncyls; nsectors = DPSECT(dp->dp_esect); if (max_nsectors < nsectors) max_nsectors = nsectors; ntracks = dp->dp_ehd + 1; if (max_ntracks < ntracks) max_ntracks = ntracks; } /* * Check that we have guessed the geometry right by checking the * partition entries. */ /* * TODO: * As above. * Check for overlaps. * Check against d_secperunit if the latter is reliable. */ error = 0; for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++) { if (dp->dp_scyl == 0 && dp->dp_shd == 0 && dp->dp_ssect == 0 && dp->dp_start == 0 && dp->dp_size == 0) continue; //sname = dsname(dev, dkunit(dev), BASE_SLICE + dospart, // WHOLE_SLICE_PART, partname); /* * Temporarily ignore errors from this check. We could * simplify things by accepting the table eariler if we * always ignore errors here. Perhaps we should always * accept the table if the magic is right but not let * bad entries affect the geometry. */ check_part(sname, dp, mbr_offset, max_nsectors, max_ntracks, mbr_offset); } if (error != 0) goto done; /* * Accept the DOS partition table. * * Adjust the disk information structure with updated CHS * conversion parameters, but only use values extracted from * the primary partition table. * * NOTE! Regardless of our having to deal with this old cruft, * we do not screw around with the info->d_media* parameters. */ secpercyl = (u_long)max_nsectors * max_ntracks; if (secpercyl != 0 && mbr_offset == DOSBBSECTOR) { info->d_secpertrack = max_nsectors; info->d_nheads = max_ntracks; info->d_secpercyl = secpercyl; info->d_ncylinders = info->d_media_blocks / secpercyl; } /* * We are passed a pointer to a suitably initialized minimal * slices "struct" with no dangling pointers in it. Replace it * by a maximal one. This usually oversizes the "struct", but * enlarging it while searching for logical drives would be * inconvenient. */ kfree(*sspp, M_DEVBUF); ssp = dsmakeslicestruct(MAX_SLICES, info); *sspp = ssp; /* Initialize normal slices. */ sp = &ssp->dss_slices[BASE_SLICE]; for (dospart = 0, dp = dp0; dospart < NDOSPART; dospart++, dp++, sp++) { sname = dsname(dev, dkunit(dev), BASE_SLICE + dospart, WHOLE_SLICE_PART, partname); (void)mbr_setslice(sname, info, sp, dp, mbr_offset); } ssp->dss_nslices = BASE_SLICE + NDOSPART; /* Handle extended partitions. */ sp -= NDOSPART; for (dospart = 0; dospart < NDOSPART; dospart++, sp++) { if (sp->ds_type == DOSPTYP_EXTENDED || sp->ds_type == DOSPTYP_EXTENDEDX) { mbr_extended(wdev, info, ssp, sp->ds_offset, sp->ds_size, sp->ds_offset, max_nsectors, max_ntracks, mbr_offset, 1); } } /* * mbr_extended() abuses ssp->dss_nslices for the number of slices * that would be found if there were no limit on the number of slices * in *ssp. Cut it back now. */ if (ssp->dss_nslices > MAX_SLICES) ssp->dss_nslices = MAX_SLICES; done: bp->b_flags |= B_INVAL | B_AGE; relpbuf(bp, NULL); if (error == EINVAL) error = 0; return (error); } static int check_part(char *sname, struct dos_partition *dp, u_int64_t offset, int nsectors, int ntracks, u_int64_t mbr_offset) { int chs_ecyl; int chs_esect; int chs_scyl; int chs_ssect; int error; u_long secpercyl; u_int64_t esector; u_int64_t esector1; u_int64_t ssector; u_int64_t ssector1; secpercyl = (u_long)nsectors * ntracks; chs_scyl = DPCYL(dp->dp_scyl, dp->dp_ssect); chs_ssect = DPSECT(dp->dp_ssect); ssector = chs_ssect - 1 + dp->dp_shd * nsectors + chs_scyl * secpercyl + mbr_offset; ssector1 = offset + dp->dp_start; /* * If ssector1 is on a cylinder >= 1024, then ssector can't be right. * Allow the C/H/S for it to be 1023/ntracks-1/nsectors, or correct * apart from the cylinder being reduced modulo 1024. Always allow * 1023/255/63, because this is the official way to represent * pure-LBA for the starting position. */ if ((ssector < ssector1 && ((chs_ssect == nsectors && dp->dp_shd == ntracks - 1 && chs_scyl == 1023) || (secpercyl != 0 && (ssector1 - ssector) % (1024 * secpercyl) == 0))) || (dp->dp_scyl == 255 && dp->dp_shd == 255 && dp->dp_ssect == 255)) { TRACE(("%s: C/H/S start %d/%d/%d, start %llu: allow\n", sname, chs_scyl, dp->dp_shd, chs_ssect, (long long)ssector1)); ssector = ssector1; } chs_ecyl = DPCYL(dp->dp_ecyl, dp->dp_esect); chs_esect = DPSECT(dp->dp_esect); esector = chs_esect - 1 + dp->dp_ehd * nsectors + chs_ecyl * secpercyl + mbr_offset; esector1 = ssector1 + dp->dp_size - 1; /* * Allow certain bogus C/H/S values for esector, as above. However, * heads == 255 isn't really legal and causes some BIOS crashes. The * correct value to indicate a pure-LBA end is 1023/heads-1/sectors - * usually 1023/254/63. "heads" is base 0, "sectors" is base 1. */ if ((esector < esector1 && ((chs_esect == nsectors && dp->dp_ehd == ntracks - 1 && chs_ecyl == 1023) || (secpercyl != 0 && (esector1 - esector) % (1024 * secpercyl) == 0))) || (dp->dp_ecyl == 255 && dp->dp_ehd == 255 && dp->dp_esect == 255)) { TRACE(("%s: C/H/S end %d/%d/%d, end %llu: allow\n", sname, chs_ecyl, dp->dp_ehd, chs_esect, (long long)esector1)); esector = esector1; } error = (ssector == ssector1 && esector == esector1) ? 0 : EINVAL; if (bootverbose) kprintf("%s: type 0x%x, start %llu, end = %llu, size %u %s\n", sname, dp->dp_typ, (long long)ssector1, (long long)esector1, dp->dp_size, (error ? "" : ": OK")); if (ssector != ssector1 && bootverbose) kprintf("%s: C/H/S start %d/%d/%d (%llu) != start %llu: invalid\n", sname, chs_scyl, dp->dp_shd, chs_ssect, (long long)ssector, (long long)ssector1); if (esector != esector1 && bootverbose) kprintf("%s: C/H/S end %d/%d/%d (%llu) != end %llu: invalid\n", sname, chs_ecyl, dp->dp_ehd, chs_esect, (long long)esector, (long long)esector1); return (error); } static void mbr_extended(cdev_t dev, struct disk_info *info, struct diskslices *ssp, u_int64_t ext_offset, u_int64_t ext_size, u_int64_t base_ext_offset, int nsectors, int ntracks, u_int64_t mbr_offset, int level) { struct buf *bp; u_char *cp; int dospart; struct dos_partition *dp; struct dos_partition dpcopy[NDOSPART]; u_int64_t ext_offsets[NDOSPART]; u_int64_t ext_sizes[NDOSPART]; char partname[2]; int slice; char *sname; struct diskslice *sp; if (level >= 16) { kprintf( "%s: excessive recursion in search for slices; aborting search\n", devtoname(dev)); return; } /* Read extended boot record. */ bp = getpbuf_mem(NULL); KKASSERT((int)info->d_media_blksize <= bp->b_bufsize); bp->b_bio1.bio_offset = (off_t)ext_offset * info->d_media_blksize; bp->b_bio1.bio_done = biodone_sync; bp->b_bio1.bio_flags |= BIO_SYNC; bp->b_bcount = info->d_media_blksize; bp->b_cmd = BUF_CMD_READ; bp->b_flags |= B_FAILONDIS; dev_dstrategy(dev, &bp->b_bio1); if (biowait(&bp->b_bio1, "mbrrd") != 0) { diskerr(&bp->b_bio1, dev, "reading extended partition table: error", LOG_PRINTF, 0); kprintf("\n"); goto done; } /* Weakly verify it. */ cp = bp->b_data; if (cp[0x1FE] != 0x55 || cp[0x1FF] != 0xAA) { sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE, WHOLE_SLICE_PART, partname); if (bootverbose) kprintf("%s: invalid extended partition table: no magic\n", sname); goto done; } /* Make a copy of the partition table to avoid alignment problems. */ memcpy(&dpcopy[0], cp + DOSPARTOFF, sizeof(dpcopy)); slice = ssp->dss_nslices; for (dospart = 0, dp = &dpcopy[0]; dospart < NDOSPART; dospart++, dp++) { ext_sizes[dospart] = 0; if (dp->dp_scyl == 0 && dp->dp_shd == 0 && dp->dp_ssect == 0 && dp->dp_start == 0 && dp->dp_size == 0) continue; if (dp->dp_typ == DOSPTYP_EXTENDED || dp->dp_typ == DOSPTYP_EXTENDEDX) { static char buf[32]; sname = dsname(dev, dkunit(dev), WHOLE_DISK_SLICE, WHOLE_SLICE_PART, partname); ksnprintf(buf, sizeof(buf), "%s", sname); if (strlen(buf) < sizeof buf - 11) strcat(buf, ""); check_part(buf, dp, base_ext_offset, nsectors, ntracks, mbr_offset); ext_offsets[dospart] = base_ext_offset + dp->dp_start; ext_sizes[dospart] = dp->dp_size; } else { sname = dsname(dev, dkunit(dev), slice, WHOLE_SLICE_PART, partname); check_part(sname, dp, ext_offset, nsectors, ntracks, mbr_offset); if (slice >= MAX_SLICES) { kprintf("%s: too many slices\n", sname); slice++; continue; } sp = &ssp->dss_slices[slice]; if (mbr_setslice(sname, info, sp, dp, ext_offset) != 0) continue; slice++; } } ssp->dss_nslices = slice; /* If we found any more slices, recursively find all the subslices. */ for (dospart = 0; dospart < NDOSPART; dospart++) { if (ext_sizes[dospart] != 0) { mbr_extended(dev, info, ssp, ext_offsets[dospart], ext_sizes[dospart], base_ext_offset, nsectors, ntracks, mbr_offset, ++level); } } done: bp->b_flags |= B_INVAL | B_AGE; relpbuf(bp, NULL); } static int mbr_setslice(char *sname, struct disk_info *info, struct diskslice *sp, struct dos_partition *dp, u_int64_t br_offset) { u_int64_t offset; u_int64_t size; offset = br_offset + dp->dp_start; if (offset > info->d_media_blocks || offset < br_offset) { kprintf( "%s: slice starts beyond end of the disk: rejecting it\n", sname); return (1); } size = info->d_media_blocks - offset; if (size >= dp->dp_size) { if (dp->dp_size == 0xFFFFFFFFU) { kprintf("%s: slice >2TB, using media size instead " "of slice table size\n", sname); } else { size = dp->dp_size; } } else { kprintf("%s: slice extends beyond end of disk: " "truncating from %u to %llu sectors\n", sname, dp->dp_size, (unsigned long long)size); } sp->ds_offset = offset; sp->ds_size = size; sp->ds_type = dp->dp_typ; bzero(&sp->ds_type_uuid, sizeof(sp->ds_type_uuid)); bzero(&sp->ds_stor_uuid, sizeof(sp->ds_type_uuid)); /* * Slices do not overlap with the parent (if any). */ sp->ds_reserved = 0; return (0); }