269 lines
6.3 KiB
C
269 lines
6.3 KiB
C
/*-
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*
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* Copyright (c) 2002 Peter Grehan.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* GEOM module for Apple Partition Maps
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* As described in 'Inside Macintosh Vol 3: About the SCSI Manager -
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* The Structure of Block Devices"
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*/
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#include <sys/param.h>
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#include <sys/endian.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/bio.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/sbuf.h>
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#include <geom/geom.h>
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#include <geom/geom_slice.h>
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#define APPLE_CLASS_NAME "APPLE"
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#define NAPMPART 16 /* Max partitions */
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struct apm_partition {
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char am_sig[2];
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u_int32_t am_mapcnt;
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u_int32_t am_start;
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u_int32_t am_partcnt;
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char am_name[32];
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char am_type[32];
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};
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struct g_apple_softc {
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u_int16_t dd_bsiz;
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u_int32_t dd_blkcnt;
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u_int16_t dd_drvrcnt;
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u_int32_t am_mapcnt0;
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struct apm_partition apmpart[NAPMPART];
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};
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static void
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g_dec_drvrdesc(u_char *ptr, struct g_apple_softc *sc)
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{
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sc->dd_bsiz = be16dec(ptr + 2);
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sc->dd_blkcnt = be32dec(ptr + 4);
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sc->dd_drvrcnt = be32dec(ptr + 16);
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}
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static void
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g_dec_apple_partition(u_char *ptr, struct apm_partition *d)
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{
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d->am_sig[0] = ptr[0];
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d->am_sig[1] = ptr[1];
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d->am_mapcnt = be32dec(ptr + 4);
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d->am_start = be32dec(ptr + 8);
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d->am_partcnt = be32dec(ptr + 12);
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memcpy(d->am_name, ptr + 16, 32);
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memcpy(d->am_type, ptr + 48, 32);
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}
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static int
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g_apple_start(struct bio *bp)
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{
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struct g_provider *pp;
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struct g_geom *gp;
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struct g_apm_softc *mp;
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struct g_slicer *gsp;
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pp = bp->bio_to;
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gp = pp->geom;
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gsp = gp->softc;
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mp = gsp->softc;
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if (bp->bio_cmd == BIO_GETATTR) {
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if (g_handleattr_off_t(bp, "APM::offset",
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gsp->slices[pp->index].offset))
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return (1);
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}
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return (0);
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}
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static void
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g_apple_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
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struct g_consumer *cp __unused, struct g_provider *pp)
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{
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struct g_apple_softc *mp;
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struct g_slicer *gsp;
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gsp = gp->softc;
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mp = gsp->softc;
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g_slice_dumpconf(sb, indent, gp, cp, pp);
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if (pp != NULL) {
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if (indent == NULL)
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sbuf_printf(sb, " n %s ty %s",
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mp->apmpart[pp->index].am_name,
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mp->apmpart[pp->index].am_type);
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else {
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sbuf_printf(sb, "%s<name>%s</name>\n", indent,
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mp->apmpart[pp->index].am_name);
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sbuf_printf(sb, "%s<type>%s</type>\n", indent,
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mp->apmpart[pp->index].am_type);
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}
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}
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}
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#if 0
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static void
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g_apple_print()
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{
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/* XXX */
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}
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#endif
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static struct g_geom *
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g_apple_taste(struct g_class *mp, struct g_provider *pp, int insist)
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{
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struct g_geom *gp;
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struct g_consumer *cp;
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int error, i, npart;
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struct g_apple_softc *ms;
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struct g_slicer *gsp;
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struct apm_partition *apm;
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u_int sectorsize;
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u_char *buf;
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g_trace(G_T_TOPOLOGY, "apple_taste(%s,%s)", mp->name, pp->name);
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g_topology_assert();
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gp = g_slice_new(mp, NAPMPART, pp, &cp, &ms, sizeof *ms, g_apple_start);
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if (gp == NULL)
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return (NULL);
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gsp = gp->softc;
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g_topology_unlock();
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gp->dumpconf = g_apple_dumpconf;
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npart = 0;
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do {
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if (gp->rank != 2 && insist == 0)
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break;
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sectorsize = cp->provider->sectorsize;
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if (sectorsize != 512)
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break;
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buf = g_read_data(cp, 0, sectorsize, &error);
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if (buf == NULL || error != 0)
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break;
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/*
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* Test for the sector 0 driver record signature, and
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* validate sector and disk size
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*/
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if (buf[0] != 'E' && buf[1] != 'R') {
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g_free(buf);
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break;
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}
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g_dec_drvrdesc(buf, ms);
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g_free(buf);
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if (ms->dd_bsiz != 512) {
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break;
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}
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/*
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* Read in the first partition map
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*/
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buf = g_read_data(cp, sectorsize, sectorsize, &error);
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if (buf == NULL || error != 0)
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break;
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/*
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* Decode the first partition: it's another indication of
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* validity, as well as giving the size of the partition
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* map
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*/
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apm = &ms->apmpart[0];
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g_dec_apple_partition(buf, apm);
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g_free(buf);
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if (apm->am_sig[0] != 'P' || apm->am_sig[1] != 'M')
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break;
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ms->am_mapcnt0 = apm->am_mapcnt;
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buf = g_read_data(cp, 2 * sectorsize,
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(NAPMPART - 1) * sectorsize, &error);
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if (buf == NULL || error != 0)
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break;
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for (i = 1; i < NAPMPART; i++) {
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g_dec_apple_partition(buf + ((i - 1) * sectorsize),
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&ms->apmpart[i]);
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}
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npart = 0;
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for (i = 0; i < NAPMPART; i++) {
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apm = &ms->apmpart[i];
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/*
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* Validate partition sig and global mapcount
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*/
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if (apm->am_sig[0] != 'P' ||
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apm->am_sig[1] != 'M')
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continue;
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if (apm->am_mapcnt != ms->am_mapcnt0)
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continue;
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if (bootverbose) {
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printf("APM Slice %d (%s/%s) on %s:\n",
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i + 1, apm->am_name, apm->am_type,
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gp->name);
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/* g_apple_print(i, dp + i); */
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}
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npart++;
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g_topology_lock();
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g_slice_config(gp, i, G_SLICE_CONFIG_SET,
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(off_t)apm->am_start << 9ULL,
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(off_t)apm->am_partcnt << 9ULL,
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sectorsize,
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"%ss%d", gp->name, i + 1);
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g_topology_unlock();
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}
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g_free(buf);
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break;
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} while(0);
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g_topology_lock();
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g_access_rel(cp, -1, 0, 0);
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if (LIST_EMPTY(&gp->provider)) {
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g_slice_spoiled(cp);
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return (NULL);
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}
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return (gp);
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}
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static struct g_class g_apple_class = {
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.name = APPLE_CLASS_NAME,
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.taste = g_apple_taste,
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G_CLASS_INITIALIZER
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};
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DECLARE_GEOM_CLASS(g_apple_class, g_apple);
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