sys/geom/geom_apple.c

   1 /*-
   2  * Copyright (c) 2002 Peter Grehan.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 /*
  28  * GEOM module for Apple Partition Maps
  29  *  As described in 'Inside Macintosh Vol 3: About the SCSI Manager -
  30  *    The Structure of Block Devices"
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include <sys/param.h>
  37 #include <sys/endian.h>
  38 #include <sys/systm.h>
  39 #include <sys/kernel.h>
  40 #include <sys/malloc.h>
  41 #include <sys/bio.h>
  42 #include <sys/lock.h>
  43 #include <sys/mutex.h>
  44
  45 #include <sys/sbuf.h>
  46 #include <geom/geom.h>
  47 #include <geom/geom_slice.h>
  48
  49 #define APPLE_CLASS_NAME "APPLE"
  50
  51 #define NAPMPART  16    /* Max partitions */
  52
  53 struct apm_partition {
  54         char       am_sig[2];
  55         u_int32_t  am_mapcnt;
  56         u_int32_t  am_start;
  57         u_int32_t  am_partcnt;
  58         char       am_name[32];
  59         char       am_type[32];
  60 };
  61
  62 struct g_apple_softc {
  63         u_int16_t dd_bsiz;
  64         u_int32_t dd_blkcnt;
  65         u_int16_t dd_drvrcnt;
  66         u_int32_t am_mapcnt0;
  67         struct apm_partition apmpart[NAPMPART];
  68 };
  69
  70 static void
  71 g_dec_drvrdesc(u_char *ptr, struct g_apple_softc *sc)
  72 {
  73         sc->dd_bsiz = be16dec(ptr + 2);
  74         sc->dd_blkcnt = be32dec(ptr + 4);
  75         sc->dd_drvrcnt = be32dec(ptr + 16);
  76 }
  77
  78 static void
  79 g_dec_apple_partition(u_char *ptr, struct apm_partition *d)
  80 {
  81         d->am_sig[0] = ptr[0];
  82         d->am_sig[1] = ptr[1];
  83         d->am_mapcnt = be32dec(ptr + 4);
  84         d->am_start = be32dec(ptr + 8);
  85         d->am_partcnt = be32dec(ptr + 12);
  86         memcpy(d->am_name, ptr + 16, 32);
  87         memcpy(d->am_type, ptr + 48, 32);
  88 }
  89
  90 static int
  91 g_apple_start(struct bio *bp)
  92 {
  93         struct g_provider *pp;
  94         struct g_geom *gp;
  95         struct g_slicer *gsp;
  96
  97         pp = bp->bio_to;
  98         gp = pp->geom;
  99         gsp = gp->softc;
 100         if (bp->bio_cmd == BIO_GETATTR) {
 101                 if (g_handleattr_off_t(bp, "APM::offset",
 102                     gsp->slices[pp->index].offset))
 103                         return (1);
 104         }
 105         return (0);
 106 }
 107
 108 static void
 109 g_apple_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
 110     struct g_consumer *cp __unused, struct g_provider *pp)
 111 {
 112         struct g_apple_softc *mp;
 113         struct g_slicer *gsp;
 114
 115         gsp = gp->softc;
 116         mp = gsp->softc;
 117         g_slice_dumpconf(sb, indent, gp, cp, pp);
 118         if (pp != NULL) {
 119                 if (indent == NULL) {
 120                         sbuf_printf(sb, " ty %s",
 121                             mp->apmpart[pp->index].am_type);
 122                         if (*mp->apmpart[pp->index].am_name)
 123                                 sbuf_printf(sb, " sn %s",
 124                                     mp->apmpart[pp->index].am_name);
 125                 } else {
 126                         sbuf_printf(sb, "%s<name>%s</name>\n", indent,
 127                             mp->apmpart[pp->index].am_name);
 128                         sbuf_printf(sb, "%s<type>%s</type>\n", indent,
 129                             mp->apmpart[pp->index].am_type);
 130                 }
 131         }
 132 }
 133
 134 #if 0
 135 static void
 136 g_apple_print()
 137 {
 138
 139         /* XXX */
 140 }
 141 #endif
 142
 143 static struct g_geom *
 144 g_apple_taste(struct g_class *mp, struct g_provider *pp, int insist)
 145 {
 146         struct g_geom *gp;
 147         struct g_consumer *cp;
 148         int error, i;
 149         struct g_apple_softc *ms;
 150         struct apm_partition *apm;
 151         u_int sectorsize;
 152         u_char *buf;
 153
 154         g_trace(G_T_TOPOLOGY, "apple_taste(%s,%s)", mp->name, pp->name);
 155         g_topology_assert();
 156         gp = g_slice_new(mp, NAPMPART, pp, &cp, &ms, sizeof *ms, g_apple_start);
 157         if (gp == NULL)
 158                 return (NULL);
 159         g_topology_unlock();
 160         gp->dumpconf = g_apple_dumpconf;
 161         do {
 162                 if (gp->rank != 2 && insist == 0)
 163                         break;
 164
 165                 sectorsize = cp->provider->sectorsize;
 166                 if (sectorsize != 512)
 167                         break;
 168
 169                 buf = g_read_data(cp, 0, sectorsize, &error);
 170                 if (buf == NULL || error != 0)
 171                         break;
 172
 173                 /*
 174                  * Test for the sector 0 driver record signature, and
 175                  * validate sector and disk size
 176                  */
 177                 if (buf[0] != 'E' && buf[1] != 'R') {
 178                         g_free(buf);
 179                         break;
 180                 }
 181                 g_dec_drvrdesc(buf, ms);
 182                 g_free(buf);
 183
 184                 if (ms->dd_bsiz != 512) {
 185                         break;
 186                 }
 187
 188                 /*
 189                  * Read in the first partition map
 190                  */
 191                 buf = g_read_data(cp, sectorsize, sectorsize,  &error);
 192                 if (buf == NULL || error != 0)
 193                         break;
 194
 195                 /*
 196                  * Decode the first partition: it's another indication of
 197                  * validity, as well as giving the size of the partition
 198                  * map
 199                  */
 200                 apm = &ms->apmpart[0];
 201                 g_dec_apple_partition(buf, apm);
 202                 g_free(buf);
 203
 204                 if (apm->am_sig[0] != 'P' || apm->am_sig[1] != 'M')
 205                         break;
 206                 ms->am_mapcnt0 = apm->am_mapcnt;
 207
 208                 buf = g_read_data(cp, 2 * sectorsize,
 209                     (NAPMPART - 1) * sectorsize,  &error);
 210                 if (buf == NULL || error != 0)
 211                         break;
 212
 213                 for (i = 1; i < NAPMPART; i++) {
 214                         g_dec_apple_partition(buf + ((i - 1) * sectorsize),
 215                             &ms->apmpart[i]);
 216                 }
 217
 218                 for (i = 0; i < NAPMPART; i++) {
 219                         apm = &ms->apmpart[i];
 220
 221                         /*
 222                          * Validate partition sig and global mapcount
 223                          */
 224                         if (apm->am_sig[0] != 'P' ||
 225                             apm->am_sig[1] != 'M')
 226                                 continue;
 227                         if (apm->am_mapcnt != ms->am_mapcnt0)
 228                                 continue;
 229
 230                         if (bootverbose) {
 231                                 printf("APM Slice %d (%s/%s) on %s:\n",
 232                                     i + 1, apm->am_name, apm->am_type,
 233                                     gp->name);
 234                                 /* g_apple_print(i, dp + i); */
 235                         }
 236                         g_topology_lock();
 237                         g_slice_config(gp, i, G_SLICE_CONFIG_SET,
 238                             (off_t)apm->am_start << 9ULL,
 239                             (off_t)apm->am_partcnt << 9ULL,
 240                             sectorsize,
 241                             "%ss%d", gp->name, i + 1);
 242                         g_topology_unlock();
 243                 }
 244                 g_free(buf);
 245                 break;
 246         } while(0);
 247         g_topology_lock();
 248         g_access(cp, -1, 0, 0);
 249         if (LIST_EMPTY(&gp->provider)) {
 250                 g_slice_spoiled(cp);
 251                 return (NULL);
 252         }
 253         return (gp);
 254 }
 255
 256
 257 static struct g_class g_apple_class     = {
 258         .name = APPLE_CLASS_NAME,
 259         .taste = g_apple_taste,
 260 };
 261
 262 DECLARE_GEOM_CLASS(g_apple_class, g_apple);