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/fcntl.h>
  41 #include <sys/malloc.h>
  42 #include <sys/bio.h>
  43 #include <sys/lock.h>
  44 #include <sys/mutex.h>
  45
  46 #include <sys/diskpc98.h>
  47 #include <geom/geom.h>
  48 #include <geom/geom_slice.h>
  49
  50 #define PC98_CLASS_NAME "PC98"
  51
  52 struct g_pc98_softc {
  53         u_int fwsectors, fwheads, sectorsize;
  54         int type[NDOSPART];
  55         u_char sec[8192];
  56 };
  57
  58 static void
  59 g_pc98_print(int i, struct pc98_partition *dp)
  60 {
  61         char sname[17];
  62
  63         strncpy(sname, dp->dp_name, 16);
  64         sname[16] = '\0';
  65
  66         hexdump(dp, sizeof(dp[0]), NULL, 0);
  67         printf("[%d] mid:%d(0x%x) sid:%d(0x%x)",
  68                i, dp->dp_mid, dp->dp_mid, dp->dp_sid, dp->dp_sid);
  69         printf(" s:%d/%d/%d", dp->dp_scyl, dp->dp_shd, dp->dp_ssect);
  70         printf(" e:%d/%d/%d", dp->dp_ecyl, dp->dp_ehd, dp->dp_esect);
  71         printf(" sname:%s\n", sname);
  72 }
  73
  74 static int
  75 g_pc98_modify(struct g_geom *gp, struct g_pc98_softc *ms, u_char *sec)
  76 {
  77         int i, error;
  78         off_t s[NDOSPART], l[NDOSPART];
  79         struct pc98_partition dp[NDOSPART];
  80
  81         g_topology_assert();
  82
  83         if (sec[0x1fe] != 0x55 || sec[0x1ff] != 0xaa)
  84                 return (EBUSY);
  85
  86 #if 0
  87         /*
  88          * By convetion, it seems that the ipl program has a jump at location
  89          * 0 to the real start of the boot loader.  By convetion, it appears
  90          * that after this jump, there's a string, terminated by at last one,
  91          * if not more, zeros, followed by the target of the jump.  FreeBSD's
  92          * pc98 boot0 uses 'IPL1' followed by 3 zeros here, likely for
  93          * compatibility with some older boot loader.  Linux98's boot loader
  94          * appears to use 'Linux 98' followed by only two.  GRUB/98 appears to
  95          * use 'GRUB/98 ' followed by none.  These last two appear to be
  96          * ported from the ia32 versions, but appear to show similar
  97          * convention.  Grub/98 has an additional NOP after the jmp, which
  98          * isn't present in others.
  99          *
 100          * The following test was inspired by looking only at partitions
 101          * with FreeBSD's boot0 (or one that it is compatible with).  As
 102          * such, if failed when other IPL programs were used.
 103          */
 104         if (sec[4] != 'I' || sec[5] != 'P' || sec[6] != 'L' || sec[7] != '1')
 105                 return (EBUSY);
 106 #endif
 107
 108         for (i = 0; i < NDOSPART; i++)
 109                 pc98_partition_dec(
 110                         sec + 512 + i * sizeof(struct pc98_partition), &dp[i]);
 111
 112         for (i = 0; i < NDOSPART; i++) {
 113                 /* If start and end are identical it's bogus */
 114                 if (dp[i].dp_ssect == dp[i].dp_esect &&
 115                     dp[i].dp_shd == dp[i].dp_ehd &&
 116                     dp[i].dp_scyl == dp[i].dp_ecyl)
 117                         s[i] = l[i] = 0;
 118                 else if (dp[i].dp_ecyl == 0)
 119                         s[i] = l[i] = 0;
 120                 else {
 121                         s[i] = (off_t)dp[i].dp_scyl *
 122                                 ms->fwsectors * ms->fwheads * ms->sectorsize;
 123                         l[i] = (off_t)(dp[i].dp_ecyl - dp[i].dp_scyl + 1) *
 124                                 ms->fwsectors * ms->fwheads * ms->sectorsize;
 125                 }
 126                 if (bootverbose) {
 127                         printf("PC98 Slice %d on %s:\n", i + 1, gp->name);
 128                         g_pc98_print(i, dp + i);
 129                 }
 130                 if (s[i] < 0 || l[i] < 0)
 131                         error = EBUSY;
 132                 else
 133                         error = g_slice_config(gp, i, G_SLICE_CONFIG_CHECK,
 134                                        s[i], l[i], ms->sectorsize,
 135                                        "%ss%d", gp->name, i + 1);
 136                 if (error)
 137                         return (error);
 138         }
 139
 140         for (i = 0; i < NDOSPART; i++) {
 141                 ms->type[i] = (dp[i].dp_sid << 8) | dp[i].dp_mid;
 142                 g_slice_config(gp, i, G_SLICE_CONFIG_SET, s[i], l[i],
 143                                ms->sectorsize, "%ss%d", gp->name, i + 1);
 144         }
 145
 146         bcopy(sec, ms->sec, sizeof (ms->sec));
 147
 148         return (0);
 149 }
 150
 151 static int
 152 g_pc98_ioctl(struct g_provider *pp, u_long cmd, void *data, int fflag, struct thread *td)
 153 {
 154         struct g_geom *gp;
 155         struct g_pc98_softc *ms;
 156         struct g_slicer *gsp;
 157         struct g_consumer *cp;
 158         int error;
 159
 160         gp = pp->geom;
 161         gsp = gp->softc;
 162         ms = gsp->softc;
 163
 164         switch(cmd) {
 165         case DIOCSPC98: {
 166                 if (!(fflag & FWRITE))
 167                         return (EPERM);
 168                 DROP_GIANT();
 169                 g_topology_lock();
 170                 /* Validate and modify our slicer instance to match. */
 171                 error = g_pc98_modify(gp, ms, data);
 172                 cp = LIST_FIRST(&gp->consumer);
 173                 error = g_write_data(cp, 0, data, 8192);
 174                 g_topology_unlock();
 175                 PICKUP_GIANT();
 176                 return(error);
 177         }
 178         default:
 179                 return (ENOIOCTL);
 180         }
 181 }
 182
 183 static int
 184 g_pc98_start(struct bio *bp)
 185 {
 186         struct g_provider *pp;
 187         struct g_geom *gp;
 188         struct g_pc98_softc *mp;
 189         struct g_slicer *gsp;
 190         int idx;
 191
 192         pp = bp->bio_to;
 193         idx = pp->index;
 194         gp = pp->geom;
 195         gsp = gp->softc;
 196         mp = gsp->softc;
 197         if (bp->bio_cmd == BIO_GETATTR) {
 198                 if (g_handleattr_int(bp, "PC98::type", mp->type[idx]))
 199                         return (1);
 200                 if (g_handleattr_off_t(bp, "PC98::offset",
 201                                        gsp->slices[idx].offset))
 202                         return (1);
 203         }
 204
 205         return (0);
 206 }
 207
 208 static void
 209 g_pc98_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
 210                 struct g_consumer *cp __unused, struct g_provider *pp)
 211 {
 212         struct g_pc98_softc *mp;
 213         struct g_slicer *gsp;
 214         struct pc98_partition dp;
 215         char sname[17];
 216
 217         gsp = gp->softc;
 218         mp = gsp->softc;
 219         g_slice_dumpconf(sb, indent, gp, cp, pp);
 220         if (pp != NULL) {
 221                 pc98_partition_dec(
 222                         mp->sec + 512 +
 223                         pp->index * sizeof(struct pc98_partition), &dp);
 224                 strncpy(sname, dp.dp_name, 16);
 225                 sname[16] = '\0';
 226                 if (indent == NULL) {
 227                         sbuf_printf(sb, " ty %d", mp->type[pp->index]);
 228                         sbuf_printf(sb, " sn %s", sname);
 229                 } else {
 230                         sbuf_printf(sb, "%s<type>%d</type>\n", indent,
 231                                     mp->type[pp->index]);
 232                         sbuf_printf(sb, "%s<sname>%s</sname>\n", indent,
 233                                     sname);
 234                 }
 235         }
 236 }
 237
 238 static struct g_geom *
 239 g_pc98_taste(struct g_class *mp, struct g_provider *pp, int flags)
 240 {
 241         struct g_geom *gp;
 242         struct g_consumer *cp;
 243         int error;
 244         struct g_pc98_softc *ms;
 245         u_int fwsectors, fwheads, sectorsize;
 246         u_char *buf;
 247
 248         g_trace(G_T_TOPOLOGY, "g_pc98_taste(%s,%s)", mp->name, pp->name);
 249         g_topology_assert();
 250         if (flags == G_TF_NORMAL &&
 251             !strcmp(pp->geom->class->name, PC98_CLASS_NAME))
 252                 return (NULL);
 253         gp = g_slice_new(mp, NDOSPART, pp, &cp, &ms, sizeof *ms, g_pc98_start);
 254         if (gp == NULL)
 255                 return (NULL);
 256         g_topology_unlock();
 257         do {
 258                 if (gp->rank != 2 && flags == G_TF_NORMAL)
 259                         break;
 260                 error = g_getattr("GEOM::fwsectors", cp, &fwsectors);
 261                 if (error || fwsectors == 0) {
 262                         fwsectors = 17;
 263                         if (bootverbose)
 264                                 printf("g_pc98_taste: guessing %d sectors\n",
 265                                     fwsectors);
 266                 }
 267                 error = g_getattr("GEOM::fwheads", cp, &fwheads);
 268                 if (error || fwheads == 0) {
 269                         fwheads = 8;
 270                         if (bootverbose)
 271                                 printf("g_pc98_taste: guessing %d heads\n",
 272                                     fwheads);
 273                 }
 274                 sectorsize = cp->provider->sectorsize;
 275                 if (sectorsize % 512 != 0)
 276                         break;
 277                 if (!strncmp(gp->name, "ad", 2)) {
 278                         u_int total_secs = cp->provider->mediasize/sectorsize;
 279
 280                         if (total_secs < 17*8*65535) {
 281                                 fwsectors = 17;
 282                                 fwheads = 8;
 283                         }
 284                         else if (total_secs < 63*16*65535) {
 285                                 if (fwsectors > 63)
 286                                         fwsectors = 63;
 287                                 if (fwheads > 16)
 288                                         fwheads = 16;
 289                         }
 290                         else if (total_secs < 255*16*65535) {
 291                                 fwsectors = 255;
 292                                 if (fwheads > 16)
 293                                         fwheads = 16;
 294                         }
 295                         else {
 296                                 fwsectors = 255;
 297                                 fwheads = 255;
 298                         }
 299                 }
 300                 buf = g_read_data(cp, 0, 8192, &error);
 301                 if (buf == NULL || error != 0)
 302                         break;
 303                 ms->fwsectors = fwsectors;
 304                 ms->fwheads = fwheads;
 305                 ms->sectorsize = sectorsize;
 306                 g_topology_lock();
 307                 g_pc98_modify(gp, ms, buf);
 308                 g_topology_unlock();
 309                 g_free(buf);
 310                 break;
 311         } while (0);
 312         g_topology_lock();
 313         g_access(cp, -1, 0, 0);
 314         if (LIST_EMPTY(&gp->provider)) {
 315                 g_slice_spoiled(cp);
 316                 return (NULL);
 317         }
 318         return (gp);
 319 }
 320
 321 static struct g_class g_pc98_class = {
 322         .name = PC98_CLASS_NAME,
 323         .version = G_VERSION,
 324         .taste = g_pc98_taste,
 325         .dumpconf = g_pc98_dumpconf,
 326         .ioctl = g_pc98_ioctl,
 327 };
 328
 329 DECLARE_GEOM_CLASS(g_pc98_class, g_pc98);