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  * $FreeBSD$
  33  */
  34
  35 #include <sys/param.h>
  36 #ifndef _KERNEL
  37 #include <signal.h>
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <err.h>
  42 #else
  43 #include <sys/systm.h>
  44 #include <sys/kernel.h>
  45 #include <sys/malloc.h>
  46 #include <sys/bio.h>
  47 #include <sys/lock.h>
  48 #include <sys/mutex.h>
  49 #endif
  50
  51 #include <sys/diskpc98.h>
  52 #include <geom/geom.h>
  53 #include <geom/geom_slice.h>
  54
  55 #define PC98_CLASS_NAME "PC98"
  56
  57 static void
  58 g_dec_dos_partition(u_char *ptr, struct dos_partition *d)
  59 {
  60         int i;
  61
  62         d->dp_mid = ptr[0];
  63         d->dp_sid = ptr[1];
  64         d->dp_dum1 = ptr[2];
  65         d->dp_dum2 = ptr[3];
  66         d->dp_ipl_sct = ptr[4];
  67         d->dp_ipl_head = ptr[5];
  68         d->dp_ipl_cyl = g_dec_le2(ptr + 6);
  69         d->dp_ssect = ptr[8];
  70         d->dp_shd = ptr[9];
  71         d->dp_scyl = g_dec_le2(ptr + 10);
  72         d->dp_esect = ptr[12];
  73         d->dp_ehd = ptr[13];
  74         d->dp_ecyl = g_dec_le2(ptr + 14);
  75         for (i = 0; i < sizeof(d->dp_name); i++)
  76                 d->dp_name[i] = ptr[16 + i];
  77 }
  78
  79 struct g_pc98_softc {
  80         int type [NDOSPART];
  81         struct dos_partition dp[NDOSPART];
  82 };
  83
  84 static int
  85 g_pc98_start(struct bio *bp)
  86 {
  87         struct g_provider *pp;
  88         struct g_geom *gp;
  89         struct g_pc98_softc *mp;
  90         struct g_slicer *gsp;
  91         int index;
  92
  93         pp = bp->bio_to;
  94         index = pp->index;
  95         gp = pp->geom;
  96         gsp = gp->softc;
  97         mp = gsp->softc;
  98         if (bp->bio_cmd == BIO_GETATTR) {
  99                 if (g_handleattr_int(bp, "PC98::type", mp->type[index]))
 100                         return (1);
 101                 if (g_handleattr_off_t(bp, "PC98::offset",
 102                                        gsp->slices[index].offset))
 103                         return (1);
 104         }
 105         return (0);
 106 }
 107
 108 static void
 109 g_pc98_dumpconf(struct sbuf *sb, char *indent, struct g_geom *gp,
 110                 struct g_consumer *cp __unused, struct g_provider *pp)
 111 {
 112         struct g_pc98_softc *mp;
 113         struct g_slicer *gsp;
 114         char sname[17];
 115
 116         gsp = gp->softc;
 117         mp = gsp->softc;
 118         g_slice_dumpconf(sb, indent, gp, cp, pp);
 119         if (pp != NULL) {
 120                 strncpy(sname, mp->dp[pp->index].dp_name, 16);
 121                 sname[16] = '\0';
 122                 if (indent == NULL) {
 123                         sbuf_printf(sb, " ty %d", mp->type[pp->index]);
 124                         sbuf_printf(sb, " sn %s", sname);
 125                 } else {
 126                         sbuf_printf(sb, "%s<type>%d</type>\n", indent,
 127                                     mp->type[pp->index]);
 128                         sbuf_printf(sb, "%s<sname>%s</sname>\n", indent,
 129                                     sname);
 130                 }
 131         }
 132 }
 133
 134 static void
 135 g_pc98_print(int i, struct dos_partition *dp)
 136 {
 137         char sname[17];
 138
 139         strncpy(sname, dp->dp_name, 16);
 140         sname[16] = '\0';
 141
 142         g_hexdump(dp, sizeof(dp[0]));
 143         printf("[%d] mid:%d(0x%x) sid:%d(0x%x)",
 144                i, dp->dp_mid, dp->dp_mid, dp->dp_sid, dp->dp_sid);
 145         printf(" s:%d/%d/%d", dp->dp_scyl, dp->dp_shd, dp->dp_ssect);
 146         printf(" e:%d/%d/%d", dp->dp_ecyl, dp->dp_ehd, dp->dp_esect);
 147         printf(" sname:%s\n", sname);
 148 }
 149
 150 static struct g_geom *
 151 g_pc98_taste(struct g_class *mp, struct g_provider *pp, int flags)
 152 {
 153         struct g_geom *gp;
 154         struct g_consumer *cp;
 155         struct g_provider *pp2;
 156         int error, i, npart;
 157         struct g_pc98_softc *ms;
 158         struct g_slicer *gsp;
 159         u_int fwsectors, fwheads, sectorsize;
 160         u_char *buf;
 161         off_t spercyl;
 162
 163         g_trace(G_T_TOPOLOGY, "g_pc98_taste(%s,%s)", mp->name, pp->name);
 164         g_topology_assert();
 165         if (flags == G_TF_NORMAL &&
 166             !strcmp(pp->geom->class->name, PC98_CLASS_NAME))
 167                 return (NULL);
 168         gp = g_slice_new(mp, NDOSPART, pp, &cp, &ms, sizeof *ms, g_pc98_start);
 169         if (gp == NULL)
 170                 return (NULL);
 171         gsp = gp->softc;
 172         g_topology_unlock();
 173         gp->dumpconf = g_pc98_dumpconf;
 174         npart = 0;
 175         while (1) {     /* a trick to allow us to use break */
 176                 if (gp->rank != 2 && flags == G_TF_NORMAL)
 177                         break;
 178                 error = g_getattr("GEOM::fwsectors", cp, &fwsectors);
 179                 if (error || fwsectors == 0) {
 180                         fwsectors = 17;
 181                         printf("g_pc98_taste: error %d guessing %d sectors\n",
 182                             error, fwsectors);
 183                 }
 184                 error = g_getattr("GEOM::fwheads", cp, &fwheads);
 185                 if (error || fwheads == 0) {
 186                         fwheads = 8;
 187                         printf("g_pc98_taste: error %d guessing %d heads\n",
 188                             error, fwheads);
 189                 }
 190                 sectorsize = cp->provider->sectorsize;
 191                 if (sectorsize < 512)
 192                         break;
 193                 gsp->frontstuff = sectorsize * fwsectors;
 194                 spercyl = (off_t)fwsectors * fwheads * sectorsize;
 195                 buf = g_read_data(cp, 0,
 196                     sectorsize < 1024 ? 1024 : sectorsize, &error);
 197                 if (buf == NULL || error != 0)
 198                         break;
 199                 if (buf[0x1fe] != 0x55 || buf[0x1ff] != 0xaa) {
 200                         g_free(buf);
 201                         break;
 202                 }
 203 #if 0
 204 /*
 205  * XXX: Some sources indicate this is a magic sequence, but appearantly
 206  * XXX: it is not universal.  Documentation would be wonderfule to have.
 207  */
 208                 if (buf[4] != 'I' || buf[5] != 'P' ||
 209                     buf[6] != 'L' || buf[7] != '1') {
 210                         g_free(buf);
 211                         break;
 212                 }
 213 #endif
 214                 for (i = 0; i < NDOSPART; i++)
 215                         g_dec_dos_partition(
 216                                 buf + 512 + i * sizeof(struct dos_partition),
 217                                 ms->dp + i);
 218                 g_free(buf);
 219                 for (i = 0; i < NDOSPART; i++) {
 220                         /* If start and end are identical it's bogus */
 221                         if (ms->dp[i].dp_ssect == ms->dp[i].dp_esect &&
 222                             ms->dp[i].dp_shd == ms->dp[i].dp_ehd &&
 223                             ms->dp[i].dp_scyl == ms->dp[i].dp_ecyl)
 224                                 continue;
 225                         if (ms->dp[i].dp_ecyl == 0)
 226                                 continue;
 227                         if (bootverbose) {
 228                                 printf("PC98 Slice %d on %s:\n",
 229                                        i + 1, gp->name);
 230                                 g_pc98_print(i, ms->dp + i);
 231                         }
 232                         npart++;
 233                         ms->type[i] = (ms->dp[i].dp_sid << 8) |
 234                                 ms->dp[i].dp_mid;
 235                         g_topology_lock();
 236                         pp2 = g_slice_addslice(gp, i,
 237                             ms->dp[i].dp_scyl * spercyl,
 238                             (ms->dp[i].dp_ecyl - ms->dp[i].dp_scyl + 1) *
 239                                                spercyl,
 240                             sectorsize,
 241                             "%ss%d", gp->name, i + 1);
 242                         g_topology_unlock();
 243                 }
 244                 break;
 245         }
 246         g_topology_lock();
 247         error = g_access_rel(cp, -1, 0, 0);
 248         if (npart > 0) {
 249                 LIST_FOREACH(pp, &gp->provider, provider)
 250                         g_error_provider(pp, 0);
 251                 return (gp);
 252         }
 253         g_std_spoiled(cp);
 254         return (NULL);
 255 }
 256
 257 static struct g_class g_pc98_class = {
 258         PC98_CLASS_NAME,
 259         g_pc98_taste,
 260         NULL,
 261         G_CLASS_INITIALIZER
 262 };
 263
 264 DECLARE_GEOM_CLASS(g_pc98_class, g_pc98);