geom_pc98.c

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    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: releng/5.0/sys/geom/geom_pc98.c 108186 2002-12-22 18:00:18Z phk $
   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         u_int u;
   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 (u = 0; u < sizeof(d->dp_name); u++)
   76                 d->dp_name[u] = ptr[16 + u];
   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 idx;
   92 
   93         pp = bp->bio_to;
   94         idx = 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[idx]))
  100                         return (1);
  101                 if (g_handleattr_off_t(bp, "PC98::offset",
  102                                        gsp->slices[idx].offset))
  103                         return (1);
  104         }
  105         return (0);
  106 }
  107 
  108 static void
  109 g_pc98_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_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         int error, i, npart;
  156         struct g_pc98_softc *ms;
  157         struct g_slicer *gsp;
  158         u_int fwsectors, fwheads, sectorsize;
  159         u_char *buf;
  160         off_t spercyl;
  161 
  162         g_trace(G_T_TOPOLOGY, "g_pc98_taste(%s,%s)", mp->name, pp->name);
  163         g_topology_assert();
  164         if (flags == G_TF_NORMAL &&
  165             !strcmp(pp->geom->class->name, PC98_CLASS_NAME))
  166                 return (NULL);
  167         gp = g_slice_new(mp, NDOSPART, pp, &cp, &ms, sizeof *ms, g_pc98_start);
  168         if (gp == NULL)
  169                 return (NULL);
  170         gsp = gp->softc;
  171         g_topology_unlock();
  172         gp->dumpconf = g_pc98_dumpconf;
  173         npart = 0;
  174         while (1) {     /* a trick to allow us to use break */
  175                 if (gp->rank != 2 && flags == G_TF_NORMAL)
  176                         break;
  177                 error = g_getattr("GEOM::fwsectors", cp, &fwsectors);
  178                 if (error || fwsectors == 0) {
  179                         fwsectors = 17;
  180                         printf("g_pc98_taste: error %d guessing %d sectors\n",
  181                             error, fwsectors);
  182                 }
  183                 error = g_getattr("GEOM::fwheads", cp, &fwheads);
  184                 if (error || fwheads == 0) {
  185                         fwheads = 8;
  186                         printf("g_pc98_taste: error %d guessing %d heads\n",
  187                             error, fwheads);
  188                 }
  189                 sectorsize = cp->provider->sectorsize;
  190                 if (sectorsize < 512)
  191                         break;
  192                 gsp->frontstuff = sectorsize * fwsectors;
  193                 spercyl = (off_t)fwsectors * fwheads * sectorsize;
  194                 buf = g_read_data(cp, 0,
  195                     sectorsize < 1024 ? 1024 : sectorsize, &error);
  196                 if (buf == NULL || error != 0)
  197                         break;
  198                 if (buf[0x1fe] != 0x55 || buf[0x1ff] != 0xaa) {
  199                         g_free(buf);
  200                         break;
  201                 }
  202 #if 0
  203 /*
  204  * XXX: Some sources indicate this is a magic sequence, but appearantly
  205  * XXX: it is not universal.  Documentation would be wonderfule to have.
  206  */
  207                 if (buf[4] != 'I' || buf[5] != 'P' ||
  208                     buf[6] != 'L' || buf[7] != '1') {
  209                         g_free(buf);
  210                         break;
  211                 }
  212 #endif
  213                 for (i = 0; i < NDOSPART; i++)
  214                         g_dec_dos_partition(
  215                                 buf + 512 + i * sizeof(struct dos_partition),
  216                                 ms->dp + i);
  217                 g_free(buf);
  218                 for (i = 0; i < NDOSPART; i++) {
  219                         /* If start and end are identical it's bogus */
  220                         if (ms->dp[i].dp_ssect == ms->dp[i].dp_esect &&
  221                             ms->dp[i].dp_shd == ms->dp[i].dp_ehd &&
  222                             ms->dp[i].dp_scyl == ms->dp[i].dp_ecyl)
  223                                 continue;
  224                         if (ms->dp[i].dp_ecyl == 0)
  225                                 continue;
  226                         if (bootverbose) {
  227                                 printf("PC98 Slice %d on %s:\n",
  228                                        i + 1, gp->name);
  229                                 g_pc98_print(i, ms->dp + i);
  230                         }
  231                         npart++;
  232                         ms->type[i] = (ms->dp[i].dp_sid << 8) |
  233                                 ms->dp[i].dp_mid;
  234                         g_topology_lock();
  235                         g_slice_config(gp, i, G_SLICE_CONFIG_SET,
  236                             ms->dp[i].dp_scyl * spercyl,
  237                             (ms->dp[i].dp_ecyl - ms->dp[i].dp_scyl + 1) *
  238                                                spercyl,
  239                             sectorsize,
  240                             "%ss%d", gp->name, i + 1);
  241                         g_topology_unlock();
  242                 }
  243                 break;
  244         }
  245         g_topology_lock();
  246         g_access_rel(cp, -1, 0, 0);
  247         if (LIST_EMPTY(&gp->provider)) {
  248                 g_std_spoiled(cp);
  249                 return (NULL);
  250         }
  251         return (gp);
  252 }
  253 
  254 static struct g_class g_pc98_class = {
  255         PC98_CLASS_NAME,
  256         g_pc98_taste,
  257         NULL,
  258         G_CLASS_INITIALIZER
  259 };
  260 
  261 DECLARE_GEOM_CLASS(g_pc98_class, g_pc98);
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FreeBSD/Linux Kernel Cross Reference sys/geom/geom_pc98.c

FreeBSD/Linux Kernel Cross Reference
sys/geom/geom_pc98.c
