The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/geom/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 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: releng/5.2/sys/geom/geom_pc98.c 119660 2003-09-01 20:45:32Z phk $");
   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         g_hexdump(dp, sizeof(dp[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          * XXX: Some sources indicate this is a magic sequence, but appearantly
   88          * XXX: it is not universal. Documentation would be wonderful to have.
   89          */
   90         if (sec[4] != 'I' || sec[5] != 'P' || sec[6] != 'L' || sec[7] != '1')
   91                 return (EBUSY);
   92 #endif
   93 
   94         for (i = 0; i < NDOSPART; i++)
   95                 pc98_partition_dec(
   96                         sec + 512 + i * sizeof(struct pc98_partition), &dp[i]);
   97 
   98         for (i = 0; i < NDOSPART; i++) {
   99                 /* If start and end are identical it's bogus */
  100                 if (dp[i].dp_ssect == dp[i].dp_esect &&
  101                     dp[i].dp_shd == dp[i].dp_ehd &&
  102                     dp[i].dp_scyl == dp[i].dp_ecyl)
  103                         s[i] = l[i] = 0;
  104                 else if (dp[i].dp_ecyl == 0)
  105                         s[i] = l[i] = 0;
  106                 else {
  107                         s[i] = (off_t)dp[i].dp_scyl *
  108                                 ms->fwsectors * ms->fwheads * ms->sectorsize;
  109                         l[i] = (off_t)(dp[i].dp_ecyl - dp[i].dp_scyl + 1) *
  110                                 ms->fwsectors * ms->fwheads * ms->sectorsize;
  111                 }
  112                 if (bootverbose) {
  113                         printf("PC98 Slice %d on %s:\n", i + 1, gp->name);
  114                         g_pc98_print(i, dp + i);
  115                 }
  116                 if (s[i] < 0 || l[i] < 0)
  117                         error = EBUSY;
  118                 else
  119                         error = g_slice_config(gp, i, G_SLICE_CONFIG_CHECK,
  120                                        s[i], l[i], ms->sectorsize,
  121                                        "%ss%d", gp->name, i + 1);
  122                 if (error)
  123                         return (error);
  124         }
  125 
  126         for (i = 0; i < NDOSPART; i++) {
  127                 ms->type[i] = (dp[i].dp_sid << 8) | dp[i].dp_mid;
  128                 g_slice_config(gp, i, G_SLICE_CONFIG_SET, s[i], l[i],
  129                                ms->sectorsize, "%ss%d", gp->name, i + 1);
  130         }
  131 
  132         bcopy(sec, ms->sec, sizeof (ms->sec));
  133 
  134         return (0);
  135 }
  136 
  137 static int
  138 g_pc98_ioctl(struct g_provider *pp, u_long cmd, void *data, struct thread *td)
  139 {
  140         struct g_geom *gp;
  141         struct g_pc98_softc *ms;
  142         struct g_slicer *gsp;
  143         struct g_consumer *cp;
  144         int error;
  145 
  146         gp = pp->geom;
  147         gsp = gp->softc;
  148         ms = gsp->softc;
  149 
  150         switch(cmd) {
  151         case DIOCSPC98: {
  152                 DROP_GIANT();
  153                 g_topology_lock();
  154                 /* Validate and modify our slicer instance to match. */
  155                 error = g_pc98_modify(gp, ms, data);
  156                 cp = LIST_FIRST(&gp->consumer);
  157                 error = g_write_data(cp, 0, data, 8192);
  158                 g_topology_unlock();
  159                 PICKUP_GIANT();
  160                 return(error);
  161         }
  162         default:
  163                 return (ENOIOCTL);
  164         }
  165 }
  166 
  167 static int
  168 g_pc98_start(struct bio *bp)
  169 {
  170         struct g_provider *pp;
  171         struct g_geom *gp;
  172         struct g_pc98_softc *mp;
  173         struct g_slicer *gsp;
  174         int idx;
  175 
  176         pp = bp->bio_to;
  177         idx = pp->index;
  178         gp = pp->geom;
  179         gsp = gp->softc;
  180         mp = gsp->softc;
  181         if (bp->bio_cmd == BIO_GETATTR) {
  182                 if (g_handleattr_int(bp, "PC98::type", mp->type[idx]))
  183                         return (1);
  184                 if (g_handleattr_off_t(bp, "PC98::offset",
  185                                        gsp->slices[idx].offset))
  186                         return (1);
  187         }
  188 
  189         return (0);
  190 }
  191 
  192 static void
  193 g_pc98_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
  194                 struct g_consumer *cp __unused, struct g_provider *pp)
  195 {
  196         struct g_pc98_softc *mp;
  197         struct g_slicer *gsp;
  198         struct pc98_partition dp;
  199         char sname[17];
  200 
  201         gsp = gp->softc;
  202         mp = gsp->softc;
  203         g_slice_dumpconf(sb, indent, gp, cp, pp);
  204         if (pp != NULL) {
  205                 pc98_partition_dec(
  206                         mp->sec + 512 +
  207                         pp->index * sizeof(struct pc98_partition), &dp);
  208                 strncpy(sname, dp.dp_name, 16);
  209                 sname[16] = '\0';
  210                 if (indent == NULL) {
  211                         sbuf_printf(sb, " ty %d", mp->type[pp->index]);
  212                         sbuf_printf(sb, " sn %s", sname);
  213                 } else {
  214                         sbuf_printf(sb, "%s<type>%d</type>\n", indent,
  215                                     mp->type[pp->index]);
  216                         sbuf_printf(sb, "%s<sname>%s</sname>\n", indent,
  217                                     sname);
  218                 }
  219         }
  220 }
  221 
  222 static struct g_geom *
  223 g_pc98_taste(struct g_class *mp, struct g_provider *pp, int flags)
  224 {
  225         struct g_geom *gp;
  226         struct g_consumer *cp;
  227         int error;
  228         struct g_pc98_softc *ms;
  229         u_int fwsectors, fwheads, sectorsize;
  230         u_char *buf;
  231 
  232         g_trace(G_T_TOPOLOGY, "g_pc98_taste(%s,%s)", mp->name, pp->name);
  233         g_topology_assert();
  234         if (flags == G_TF_NORMAL &&
  235             !strcmp(pp->geom->class->name, PC98_CLASS_NAME))
  236                 return (NULL);
  237         gp = g_slice_new(mp, NDOSPART, pp, &cp, &ms, sizeof *ms, g_pc98_start);
  238         if (gp == NULL)
  239                 return (NULL);
  240         g_topology_unlock();
  241         gp->dumpconf = g_pc98_dumpconf;
  242         gp->ioctl = g_pc98_ioctl;
  243         do {
  244                 if (gp->rank != 2 && flags == G_TF_NORMAL)
  245                         break;
  246                 error = g_getattr("GEOM::fwsectors", cp, &fwsectors);
  247                 if (error || fwsectors == 0) {
  248                         fwsectors = 17;
  249                         if (bootverbose)
  250                                 printf("g_pc98_taste: guessing %d sectors\n",
  251                                     fwsectors);
  252                 }
  253                 error = g_getattr("GEOM::fwheads", cp, &fwheads);
  254                 if (error || fwheads == 0) {
  255                         fwheads = 8;
  256                         if (bootverbose)
  257                                 printf("g_pc98_taste: guessing %d heads\n",
  258                                     fwheads);
  259                 }
  260                 sectorsize = cp->provider->sectorsize;
  261                 if (sectorsize < 512)
  262                         break;
  263                 buf = g_read_data(cp, 0, 8192, &error);
  264                 if (buf == NULL || error != 0)
  265                         break;
  266                 ms->fwsectors = fwsectors;
  267                 ms->fwheads = fwheads;
  268                 ms->sectorsize = sectorsize;
  269                 g_topology_lock();
  270                 g_pc98_modify(gp, ms, buf);
  271                 g_topology_unlock();
  272                 g_free(buf);
  273                 break;
  274         } while (0);
  275         g_topology_lock();
  276         g_access_rel(cp, -1, 0, 0);
  277         if (LIST_EMPTY(&gp->provider)) {
  278                 g_slice_spoiled(cp);
  279                 return (NULL);
  280         }
  281         return (gp);
  282 }
  283 
  284 static struct g_class g_pc98_class = {
  285         .name = PC98_CLASS_NAME,
  286         .taste = g_pc98_taste,
  287 };
  288 
  289 DECLARE_GEOM_CLASS(g_pc98_class, g_pc98);

Cache object: 908cf59c57d513841a1c9380d4ccca15


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