sys/geom/geom_pc98.c

   1 /*-
   2  * Copyright (c) 2002 Poul-Henning Kamp
   3  * Copyright (c) 2002 Networks Associates Technology, Inc.
   4  * All rights reserved.
   5  *
   6  * This software was developed for the FreeBSD Project by Poul-Henning Kamp
   7  * and NAI Labs, the Security Research Division of Network Associates, Inc.
   8  * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
   9  * DARPA CHATS research program.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  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/diskpc98.h>
  46 #include <geom/geom.h>
  47 #include <geom/geom_slice.h>
  48
  49 #define PC98_CLASS_NAME "PC98"
  50
  51 struct g_pc98_softc {
  52         u_int fwsectors, fwheads, sectorsize;
  53         int type[NDOSPART];
  54         u_char sec[8192];
  55 };
  56
  57 static void
  58 g_pc98_print(int i, struct pc98_partition *dp)
  59 {
  60         char sname[17];
  61
  62         strncpy(sname, dp->dp_name, 16);
  63         sname[16] = '\0';
  64
  65         hexdump(dp, sizeof(dp[0]), NULL, 0);
  66         printf("[%d] mid:%d(0x%x) sid:%d(0x%x)",
  67                i, dp->dp_mid, dp->dp_mid, dp->dp_sid, dp->dp_sid);
  68         printf(" s:%d/%d/%d", dp->dp_scyl, dp->dp_shd, dp->dp_ssect);
  69         printf(" e:%d/%d/%d", dp->dp_ecyl, dp->dp_ehd, dp->dp_esect);
  70         printf(" sname:%s\n", sname);
  71 }
  72
  73 static int
  74 g_pc98_modify(struct g_geom *gp, struct g_pc98_softc *ms, u_char *sec)
  75 {
  76         int i, error;
  77         off_t s[NDOSPART], l[NDOSPART];
  78         struct pc98_partition dp[NDOSPART];
  79
  80         g_topology_assert();
  81
  82         if (sec[0x1fe] != 0x55 || sec[0x1ff] != 0xaa)
  83                 return (EBUSY);
  84
  85 #if 0
  86         /*
  87          * By convetion, it seems that the ipl program has a jump at location
  88          * 0 to the real start of the boot loader.  By convetion, it appears
  89          * that after this jump, there's a string, terminated by at last one,
  90          * if not more, zeros, followed by the target of the jump.  FreeBSD's
  91          * pc98 boot0 uses 'IPL1' followed by 3 zeros here, likely for
  92          * compatibility with some older boot loader.  Linux98's boot loader
  93          * appears to use 'Linux 98' followed by only two.  GRUB/98 appears to
  94          * use 'GRUB/98 ' followed by none.  These last two appear to be
  95          * ported from the ia32 versions, but appear to show similar
  96          * convention.  Grub/98 has an additional NOP after the jmp, which
  97          * isn't present in others.
  98          *
  99          * The following test was inspired by looking only at partitions
 100          * with FreeBSD's boot0 (or one that it is compatible with).  As
 101          * such, if failed when other IPL programs were used.
 102          */
 103         if (sec[4] != 'I' || sec[5] != 'P' || sec[6] != 'L' || sec[7] != '1')
 104                 return (EBUSY);
 105 #endif
 106
 107         for (i = 0; i < NDOSPART; i++)
 108                 pc98_partition_dec(
 109                         sec + 512 + i * sizeof(struct pc98_partition), &dp[i]);
 110
 111         for (i = 0; i < NDOSPART; i++) {
 112                 /* If start and end are identical it's bogus */
 113                 if (dp[i].dp_ssect == dp[i].dp_esect &&
 114                     dp[i].dp_shd == dp[i].dp_ehd &&
 115                     dp[i].dp_scyl == dp[i].dp_ecyl)
 116                         s[i] = l[i] = 0;
 117                 else if (dp[i].dp_ecyl == 0)
 118                         s[i] = l[i] = 0;
 119                 else {
 120                         s[i] = (off_t)dp[i].dp_scyl *
 121                                 ms->fwsectors * ms->fwheads * ms->sectorsize;
 122                         l[i] = (off_t)(dp[i].dp_ecyl - dp[i].dp_scyl + 1) *
 123                                 ms->fwsectors * ms->fwheads * ms->sectorsize;
 124                 }
 125                 if (bootverbose) {
 126                         printf("PC98 Slice %d on %s:\n", i + 1, gp->name);
 127                         g_pc98_print(i, dp + i);
 128                 }
 129                 if (s[i] < 0 || l[i] < 0)
 130                         error = EBUSY;
 131                 else
 132                         error = g_slice_config(gp, i, G_SLICE_CONFIG_CHECK,
 133                                        s[i], l[i], ms->sectorsize,
 134                                        "%ss%d", gp->name, i + 1);
 135                 if (error)
 136                         return (error);
 137         }
 138
 139         for (i = 0; i < NDOSPART; i++) {
 140                 ms->type[i] = (dp[i].dp_sid << 8) | dp[i].dp_mid;
 141                 g_slice_config(gp, i, G_SLICE_CONFIG_SET, s[i], l[i],
 142                                ms->sectorsize, "%ss%d", gp->name, i + 1);
 143         }
 144
 145         bcopy(sec, ms->sec, sizeof (ms->sec));
 146
 147         return (0);
 148 }
 149
 150 static int
 151 g_pc98_ioctl(struct g_provider *pp, u_long cmd, void *data, struct thread *td)
 152 {
 153         struct g_geom *gp;
 154         struct g_pc98_softc *ms;
 155         struct g_slicer *gsp;
 156         struct g_consumer *cp;
 157         int error;
 158
 159         gp = pp->geom;
 160         gsp = gp->softc;
 161         ms = gsp->softc;
 162
 163         switch(cmd) {
 164         case DIOCSPC98: {
 165                 DROP_GIANT();
 166                 g_topology_lock();
 167                 /* Validate and modify our slicer instance to match. */
 168                 error = g_pc98_modify(gp, ms, data);
 169                 cp = LIST_FIRST(&gp->consumer);
 170                 error = g_write_data(cp, 0, data, 8192);
 171                 g_topology_unlock();
 172                 PICKUP_GIANT();
 173                 return(error);
 174         }
 175         default:
 176                 return (ENOIOCTL);
 177         }
 178 }
 179
 180 static int
 181 g_pc98_start(struct bio *bp)
 182 {
 183         struct g_provider *pp;
 184         struct g_geom *gp;
 185         struct g_pc98_softc *mp;
 186         struct g_slicer *gsp;
 187         int idx;
 188
 189         pp = bp->bio_to;
 190         idx = pp->index;
 191         gp = pp->geom;
 192         gsp = gp->softc;
 193         mp = gsp->softc;
 194         if (bp->bio_cmd == BIO_GETATTR) {
 195                 if (g_handleattr_int(bp, "PC98::type", mp->type[idx]))
 196                         return (1);
 197                 if (g_handleattr_off_t(bp, "PC98::offset",
 198                                        gsp->slices[idx].offset))
 199                         return (1);
 200         }
 201
 202         return (0);
 203 }
 204
 205 static void
 206 g_pc98_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
 207                 struct g_consumer *cp __unused, struct g_provider *pp)
 208 {
 209         struct g_pc98_softc *mp;
 210         struct g_slicer *gsp;
 211         struct pc98_partition dp;
 212         char sname[17];
 213
 214         gsp = gp->softc;
 215         mp = gsp->softc;
 216         g_slice_dumpconf(sb, indent, gp, cp, pp);
 217         if (pp != NULL) {
 218                 pc98_partition_dec(
 219                         mp->sec + 512 +
 220                         pp->index * sizeof(struct pc98_partition), &dp);
 221                 strncpy(sname, dp.dp_name, 16);
 222                 sname[16] = '\0';
 223                 if (indent == NULL) {
 224                         sbuf_printf(sb, " ty %d", mp->type[pp->index]);
 225                         sbuf_printf(sb, " sn %s", sname);
 226                 } else {
 227                         sbuf_printf(sb, "%s<type>%d</type>\n", indent,
 228                                     mp->type[pp->index]);
 229                         sbuf_printf(sb, "%s<sname>%s</sname>\n", indent,
 230                                     sname);
 231                 }
 232         }
 233 }
 234
 235 static struct g_geom *
 236 g_pc98_taste(struct g_class *mp, struct g_provider *pp, int flags)
 237 {
 238         struct g_geom *gp;
 239         struct g_consumer *cp;
 240         int error;
 241         struct g_pc98_softc *ms;
 242         u_int fwsectors, fwheads, sectorsize;
 243         u_char *buf;
 244
 245         g_trace(G_T_TOPOLOGY, "g_pc98_taste(%s,%s)", mp->name, pp->name);
 246         g_topology_assert();
 247         if (flags == G_TF_NORMAL &&
 248             !strcmp(pp->geom->class->name, PC98_CLASS_NAME))
 249                 return (NULL);
 250         gp = g_slice_new(mp, NDOSPART, pp, &cp, &ms, sizeof *ms, g_pc98_start);
 251         if (gp == NULL)
 252                 return (NULL);
 253         g_topology_unlock();
 254         do {
 255                 if (gp->rank != 2 && flags == G_TF_NORMAL)
 256                         break;
 257                 error = g_getattr("GEOM::fwsectors", cp, &fwsectors);
 258                 if (error || fwsectors == 0) {
 259                         fwsectors = 17;
 260                         if (bootverbose)
 261                                 printf("g_pc98_taste: guessing %d sectors\n",
 262                                     fwsectors);
 263                 }
 264                 error = g_getattr("GEOM::fwheads", cp, &fwheads);
 265                 if (error || fwheads == 0) {
 266                         fwheads = 8;
 267                         if (bootverbose)
 268                                 printf("g_pc98_taste: guessing %d heads\n",
 269                                     fwheads);
 270                 }
 271                 sectorsize = cp->provider->sectorsize;
 272                 if (sectorsize % 512 != 0)
 273                         break;
 274                 if (!strncmp(gp->name, "ad", 2)) {
 275                         u_int total_secs = cp->provider->mediasize/sectorsize;
 276
 277                         if (total_secs < 17*8*65535) {
 278                                 fwsectors = 17;
 279                                 fwheads = 8;
 280                         }
 281                         else if (total_secs < 63*16*65535) {
 282                                 if (fwsectors > 63)
 283                                         fwsectors = 63;
 284                                 if (fwheads > 16)
 285                                         fwheads = 16;
 286                         }
 287                         else if (total_secs < 255*16*65535) {
 288                                 fwsectors = 255;
 289                                 if (fwheads > 16)
 290                                         fwheads = 16;
 291                         }
 292                         else {
 293                                 fwsectors = 255;
 294                                 fwheads = 255;
 295                         }
 296                 }
 297                 buf = g_read_data(cp, 0, 8192, &error);
 298                 if (buf == NULL || error != 0)
 299                         break;
 300                 ms->fwsectors = fwsectors;
 301                 ms->fwheads = fwheads;
 302                 ms->sectorsize = sectorsize;
 303                 g_topology_lock();
 304                 g_pc98_modify(gp, ms, buf);
 305                 g_topology_unlock();
 306                 g_free(buf);
 307                 break;
 308         } while (0);
 309         g_topology_lock();
 310         g_access(cp, -1, 0, 0);
 311         if (LIST_EMPTY(&gp->provider)) {
 312                 g_slice_spoiled(cp);
 313                 return (NULL);
 314         }
 315         return (gp);
 316 }
 317
 318 static struct g_class g_pc98_class = {
 319         .name = PC98_CLASS_NAME,
 320         .version = G_VERSION,
 321         .taste = g_pc98_taste,
 322         .dumpconf = g_pc98_dumpconf,
 323         .ioctl = g_pc98_ioctl,
 324 };
 325
 326 DECLARE_GEOM_CLASS(g_pc98_class, g_pc98);