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: src/sys/geom/geom_pc98.c,v 1.47.2.1 2005/02/28 13:59:03 phk Exp $");
   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          * XXX: Some sources indicate this is a magic sequence, but appearantly
   89          * XXX: it is not universal. Documentation would be wonderful to have.
   90          */
   91         if (sec[4] != 'I' || sec[5] != 'P' || sec[6] != 'L' || sec[7] != '1')
   92                 return (EBUSY);
   93 #endif
   94 
   95         for (i = 0; i < NDOSPART; i++)
   96                 pc98_partition_dec(
   97                         sec + 512 + i * sizeof(struct pc98_partition), &dp[i]);
   98 
   99         for (i = 0; i < NDOSPART; i++) {
  100                 /* If start and end are identical it's bogus */
  101                 if (dp[i].dp_ssect == dp[i].dp_esect &&
  102                     dp[i].dp_shd == dp[i].dp_ehd &&
  103                     dp[i].dp_scyl == dp[i].dp_ecyl)
  104                         s[i] = l[i] = 0;
  105                 else if (dp[i].dp_ecyl == 0)
  106                         s[i] = l[i] = 0;
  107                 else {
  108                         s[i] = (off_t)dp[i].dp_scyl *
  109                                 ms->fwsectors * ms->fwheads * ms->sectorsize;
  110                         l[i] = (off_t)(dp[i].dp_ecyl - dp[i].dp_scyl + 1) *
  111                                 ms->fwsectors * ms->fwheads * ms->sectorsize;
  112                 }
  113                 if (bootverbose) {
  114                         printf("PC98 Slice %d on %s:\n", i + 1, gp->name);
  115                         g_pc98_print(i, dp + i);
  116                 }
  117                 if (s[i] < 0 || l[i] < 0)
  118                         error = EBUSY;
  119                 else
  120                         error = g_slice_config(gp, i, G_SLICE_CONFIG_CHECK,
  121                                        s[i], l[i], ms->sectorsize,
  122                                        "%ss%d", gp->name, i + 1);
  123                 if (error)
  124                         return (error);
  125         }
  126 
  127         for (i = 0; i < NDOSPART; i++) {
  128                 ms->type[i] = (dp[i].dp_sid << 8) | dp[i].dp_mid;
  129                 g_slice_config(gp, i, G_SLICE_CONFIG_SET, s[i], l[i],
  130                                ms->sectorsize, "%ss%d", gp->name, i + 1);
  131         }
  132 
  133         bcopy(sec, ms->sec, sizeof (ms->sec));
  134 
  135         return (0);
  136 }
  137 
  138 static int
  139 g_pc98_ioctl(struct g_provider *pp, u_long cmd, void *data, int fflag, struct thread *td)
  140 {
  141         struct g_geom *gp;
  142         struct g_pc98_softc *ms;
  143         struct g_slicer *gsp;
  144         struct g_consumer *cp;
  145         int error;
  146 
  147         gp = pp->geom;
  148         gsp = gp->softc;
  149         ms = gsp->softc;
  150 
  151         switch(cmd) {
  152         case DIOCSPC98: {
  153                 if (!(fflag & FWRITE))
  154                         return (EPERM);
  155                 DROP_GIANT();
  156                 g_topology_lock();
  157                 /* Validate and modify our slicer instance to match. */
  158                 error = g_pc98_modify(gp, ms, data);
  159                 cp = LIST_FIRST(&gp->consumer);
  160                 error = g_write_data(cp, 0, data, 8192);
  161                 g_topology_unlock();
  162                 PICKUP_GIANT();
  163                 return(error);
  164         }
  165         default:
  166                 return (ENOIOCTL);
  167         }
  168 }
  169 
  170 static int
  171 g_pc98_start(struct bio *bp)
  172 {
  173         struct g_provider *pp;
  174         struct g_geom *gp;
  175         struct g_pc98_softc *mp;
  176         struct g_slicer *gsp;
  177         int idx;
  178 
  179         pp = bp->bio_to;
  180         idx = pp->index;
  181         gp = pp->geom;
  182         gsp = gp->softc;
  183         mp = gsp->softc;
  184         if (bp->bio_cmd == BIO_GETATTR) {
  185                 if (g_handleattr_int(bp, "PC98::type", mp->type[idx]))
  186                         return (1);
  187                 if (g_handleattr_off_t(bp, "PC98::offset",
  188                                        gsp->slices[idx].offset))
  189                         return (1);
  190         }
  191 
  192         return (0);
  193 }
  194 
  195 static void
  196 g_pc98_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
  197                 struct g_consumer *cp __unused, struct g_provider *pp)
  198 {
  199         struct g_pc98_softc *mp;
  200         struct g_slicer *gsp;
  201         struct pc98_partition dp;
  202         char sname[17];
  203 
  204         gsp = gp->softc;
  205         mp = gsp->softc;
  206         g_slice_dumpconf(sb, indent, gp, cp, pp);
  207         if (pp != NULL) {
  208                 pc98_partition_dec(
  209                         mp->sec + 512 +
  210                         pp->index * sizeof(struct pc98_partition), &dp);
  211                 strncpy(sname, dp.dp_name, 16);
  212                 sname[16] = '\0';
  213                 if (indent == NULL) {
  214                         sbuf_printf(sb, " ty %d", mp->type[pp->index]);
  215                         sbuf_printf(sb, " sn %s", sname);
  216                 } else {
  217                         sbuf_printf(sb, "%s<type>%d</type>\n", indent,
  218                                     mp->type[pp->index]);
  219                         sbuf_printf(sb, "%s<sname>%s</sname>\n", indent,
  220                                     sname);
  221                 }
  222         }
  223 }
  224 
  225 static struct g_geom *
  226 g_pc98_taste(struct g_class *mp, struct g_provider *pp, int flags)
  227 {
  228         struct g_geom *gp;
  229         struct g_consumer *cp;
  230         int error;
  231         struct g_pc98_softc *ms;
  232         u_int fwsectors, fwheads, sectorsize;
  233         u_char *buf;
  234 
  235         g_trace(G_T_TOPOLOGY, "g_pc98_taste(%s,%s)", mp->name, pp->name);
  236         g_topology_assert();
  237         if (flags == G_TF_NORMAL &&
  238             !strcmp(pp->geom->class->name, PC98_CLASS_NAME))
  239                 return (NULL);
  240         gp = g_slice_new(mp, NDOSPART, pp, &cp, &ms, sizeof *ms, g_pc98_start);
  241         if (gp == NULL)
  242                 return (NULL);
  243         g_topology_unlock();
  244         do {
  245                 if (gp->rank != 2 && flags == G_TF_NORMAL)
  246                         break;
  247                 error = g_getattr("GEOM::fwsectors", cp, &fwsectors);
  248                 if (error || fwsectors == 0) {
  249                         fwsectors = 17;
  250                         if (bootverbose)
  251                                 printf("g_pc98_taste: guessing %d sectors\n",
  252                                     fwsectors);
  253                 }
  254                 error = g_getattr("GEOM::fwheads", cp, &fwheads);
  255                 if (error || fwheads == 0) {
  256                         fwheads = 8;
  257                         if (bootverbose)
  258                                 printf("g_pc98_taste: guessing %d heads\n",
  259                                     fwheads);
  260                 }
  261                 sectorsize = cp->provider->sectorsize;
  262                 if (sectorsize < 512)
  263                         break;
  264                 buf = g_read_data(cp, 0, 8192, &error);
  265                 if (buf == NULL || error != 0)
  266                         break;
  267                 ms->fwsectors = fwsectors;
  268                 ms->fwheads = fwheads;
  269                 ms->sectorsize = sectorsize;
  270                 g_topology_lock();
  271                 g_pc98_modify(gp, ms, buf);
  272                 g_topology_unlock();
  273                 g_free(buf);
  274                 break;
  275         } while (0);
  276         g_topology_lock();
  277         g_access(cp, -1, 0, 0);
  278         if (LIST_EMPTY(&gp->provider)) {
  279                 g_slice_spoiled(cp);
  280                 return (NULL);
  281         }
  282         return (gp);
  283 }
  284 
  285 static struct g_class g_pc98_class = {
  286         .name = PC98_CLASS_NAME,
  287         .version = G_VERSION,
  288         .taste = g_pc98_taste,
  289         .dumpconf = g_pc98_dumpconf,
  290         .ioctl = g_pc98_ioctl,
  291 };
  292 
  293 DECLARE_GEOM_CLASS(g_pc98_class, g_pc98);

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