/* $NetBSD: disksubr_mbr.c,v 1.18 2013/08/13 00:04:08 matt Exp $ */ /* * Copyright (c) 1998 Christopher G. Demetriou. 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Christopher G. Demetriou * for the NetBSD Project. * 4. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. */ /* * 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. * * @(#)ufs_disksubr.c 7.16 (Berkeley) 5/4/91 */ /* * From i386 disklabel.c rev 1.29, with cleanups and modifications to * make it easier to use on the arm32 and to use as MI code (not quite * clean enough, yet). */ #include <sys/cdefs.h> __KERNEL_RCSID(0, "$NetBSD: disksubr_mbr.c,v 1.18 2013/08/13 00:04:08 matt Exp $"); #include <sys/param.h> #include <sys/systm.h> #include <sys/buf.h> #include <sys/disklabel.h> #include "opt_mbr.h" #define MBRSIGOFS 0x1fe static char mbrsig[2] = {0x55, 0xaa}; int mbr_label_read(dev_t dev, void (*strat)(struct buf *), struct disklabel *lp, struct cpu_disklabel *osdep, const char **msgp, int *cylp, int *netbsd_label_offp) { struct mbr_partition *mbrp; struct partition *pp; int cyl, mbrpartoff, i; struct buf *bp; int rv = 1; /* get a buffer and initialize it */ bp = geteblk((int)lp->d_secsize); bp->b_dev = dev; /* In case nothing sets them */ mbrpartoff = 0; cyl = LABELSECTOR / lp->d_secpercyl; mbrp = osdep->mbrparts; /* read master boot record */ bp->b_blkno = MBR_BBSECTOR; bp->b_bcount = lp->d_secsize; bp->b_flags |= B_READ; bp->b_cylinder = MBR_BBSECTOR / lp->d_secpercyl; (*strat)(bp); /* if successful, wander through dos partition table */ if (biowait(bp)) { *msgp = "dos partition I/O error"; goto out; } else { struct mbr_partition *ourmbrp = NULL; int nfound = 0; /* XXX "there has to be a better check than this." */ if (memcmp((char *)bp->b_data + MBRSIGOFS, mbrsig, sizeof(mbrsig))) { rv = 0; goto out; } /* XXX how do we check veracity/bounds of this? */ memcpy(mbrp, (char *)bp->b_data + MBR_PART_OFFSET, MBR_PART_COUNT * sizeof(*mbrp)); /* look for NetBSD partition */ ourmbrp = NULL; for (i = 0; !ourmbrp && i < MBR_PART_COUNT; i++) { if (mbrp[i].mbrp_type == MBR_PTYPE_NETBSD) ourmbrp = &mbrp[i]; } #ifdef COMPAT_386BSD_MBRPART /* didn't find it -- look for 386BSD partition */ for (i = 0; !ourmbrp && i < MBR_PART_COUNT; i++) { if (mbrp[i].mbrp_type == MBR_PTYPE_386BSD) { printf("WARNING: old BSD partition ID!\n"); ourmbrp = &mbrp[i]; break; } } #endif pp = &lp->d_partitions['e' - 'a']; for (i = 0; i < MBR_PART_COUNT; i++, mbrp++, pp++) { if ((i == 0 && mbrp->mbrp_type == MBR_PTYPE_PMBR) || mbrp->mbrp_type == MBR_PTYPE_UNUSED) { memset(pp, 0, sizeof(*pp)); continue; } if (le32toh(mbrp->mbrp_start) + le32toh(mbrp->mbrp_size) > lp->d_secperunit) { /* This mbr doesn't look good.... */ memset(pp, 0, sizeof(*pp)); continue; } nfound++; /* Install in partition e, f, g, or h. */ pp->p_offset = le32toh(mbrp->mbrp_start); pp->p_size = le32toh(mbrp->mbrp_size); pp->p_fstype = xlat_mbr_fstype(mbrp->mbrp_type); /* is this ours? */ if (mbrp != ourmbrp) continue; /* need sector address for SCSI/IDE, cylinder for ESDI/ST506/RLL */ mbrpartoff = le32toh(mbrp->mbrp_start); cyl = MBR_PCYL(mbrp->mbrp_scyl, mbrp->mbrp_ssect); #ifdef __i386__ /* XXX? */ /* update disklabel with details */ lp->d_partitions[2].p_size = le32toh(mbrp->mbrp_size); lp->d_partitions[2].p_offset = le32toh(mbrp->mbrp_start); lp->d_ntracks = mbrp->mbrp_ehd + 1; lp->d_nsectors = MBR_PSECT(mbrp->mbrp_esect); lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; #endif } i += 'e' - 'a'; if (nfound > 0) { lp->d_npartitions = i; strncpy(lp->d_packname, "fictitious-MBR", sizeof lp->d_packname); } if (lp->d_npartitions < MAXPARTITIONS) { memset(pp, 0, (MAXPARTITIONS - i) * sizeof(*pp)); } } *cylp = cyl; *netbsd_label_offp = mbrpartoff; *msgp = NULL; out: brelse(bp, 0); return (rv); } /* * Return -1 not found, 0 found positive errno */ int mbr_label_locate(dev_t dev, void (*strat)(struct buf *), struct disklabel *lp, struct cpu_disklabel *osdep, int *cylp, int *netbsd_label_offp) { struct mbr_partition *mbrp; int cyl, mbrpartoff, i; struct mbr_partition *ourmbrp = NULL; struct buf *bp; int rv; /* get a buffer and initialize it */ bp = geteblk((int)lp->d_secsize); bp->b_dev = dev; /* do MBR partitions in the process of getting disklabel? */ mbrpartoff = 0; cyl = LABELSECTOR / lp->d_secpercyl; mbrp = osdep->mbrparts; /* read master boot record */ bp->b_blkno = MBR_BBSECTOR; bp->b_bcount = lp->d_secsize; bp->b_flags |= B_READ; bp->b_cylinder = MBR_BBSECTOR / lp->d_secpercyl; (*strat)(bp); if ((rv = biowait(bp)) != 0) { goto out; } if (memcmp((char *)bp->b_data + MBRSIGOFS, mbrsig, sizeof(mbrsig))) { rv = 0; goto out; } /* XXX how do we check veracity/bounds of this? */ memcpy(mbrp, (char *)bp->b_data + MBR_PART_OFFSET, MBR_PART_COUNT * sizeof(*mbrp)); /* look for NetBSD partition */ ourmbrp = NULL; for (i = 0; !ourmbrp && i < MBR_PART_COUNT; i++) { if (mbrp[i].mbrp_type == MBR_PTYPE_NETBSD) ourmbrp = &mbrp[i]; } #ifdef COMPAT_386BSD_MBRPART /* didn't find it -- look for 386BSD partition */ for (i = 0; !ourmbrp && i < MBR_PART_COUNT; i++) { if (mbrp[i].mbrp_type == MBR_PTYPE_386BSD) { printf("WARNING: old BSD partition ID!\n"); ourmbrp = &mbrp[i]; } } #endif if (!ourmbrp) { rv = 0; /* XXX allow easy clobber? */ goto out; } /* need sector address for SCSI/IDE, cylinder for ESDI/ST506/RLL */ mbrpartoff = le32toh(ourmbrp->mbrp_start); cyl = MBR_PCYL(ourmbrp->mbrp_scyl, ourmbrp->mbrp_ssect); *cylp = cyl; *netbsd_label_offp = mbrpartoff; rv = -1; out: brelse(bp, 0); return (rv); }
