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/7.3/sys/geom/geom_pc98.c 152971 2005-11-30 22:15:00Z sobomax $");
   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 /*
   75  * XXX: Add gctl_req arg and give good error msgs.
   76  * XXX: Check that length argument does not bring boot code inside any slice.
   77  */
   78 static int
   79 g_pc98_modify(struct g_geom *gp, struct g_pc98_softc *ms, u_char *sec, int len __unused)
   80 {
   81         int i, error;
   82         off_t s[NDOSPART], l[NDOSPART];
   83         struct pc98_partition dp[NDOSPART];
   84 
   85         g_topology_assert();
   86         
   87         if (sec[0x1fe] != 0x55 || sec[0x1ff] != 0xaa)
   88                 return (EBUSY);
   89 
   90 #if 0
   91         /*
   92          * By convetion, it seems that the ipl program has a jump at location
   93          * 0 to the real start of the boot loader.  By convetion, it appears
   94          * that after this jump, there's a string, terminated by at last one,
   95          * if not more, zeros, followed by the target of the jump.  FreeBSD's
   96          * pc98 boot0 uses 'IPL1' followed by 3 zeros here, likely for
   97          * compatibility with some older boot loader.  Linux98's boot loader
   98          * appears to use 'Linux 98' followed by only two.  GRUB/98 appears to
   99          * use 'GRUB/98 ' followed by none.  These last two appear to be
  100          * ported from the ia32 versions, but appear to show similar
  101          * convention.  Grub/98 has an additional NOP after the jmp, which
  102          * isn't present in others.
  103          *
  104          * The following test was inspired by looking only at partitions
  105          * with FreeBSD's boot0 (or one that it is compatible with).  As
  106          * such, if failed when other IPL programs were used.
  107          */
  108         if (sec[4] != 'I' || sec[5] != 'P' || sec[6] != 'L' || sec[7] != '1')
  109                 return (EBUSY);
  110 #endif
  111 
  112         for (i = 0; i < NDOSPART; i++)
  113                 pc98_partition_dec(
  114                         sec + 512 + i * sizeof(struct pc98_partition), &dp[i]);
  115 
  116         for (i = 0; i < NDOSPART; i++) {
  117                 /* If start and end are identical it's bogus */
  118                 if (dp[i].dp_ssect == dp[i].dp_esect &&
  119                     dp[i].dp_shd == dp[i].dp_ehd &&
  120                     dp[i].dp_scyl == dp[i].dp_ecyl)
  121                         s[i] = l[i] = 0;
  122                 else if (dp[i].dp_ecyl == 0)
  123                         s[i] = l[i] = 0;
  124                 else {
  125                         s[i] = (off_t)dp[i].dp_scyl *
  126                                 ms->fwsectors * ms->fwheads * ms->sectorsize;
  127                         l[i] = (off_t)(dp[i].dp_ecyl - dp[i].dp_scyl + 1) *
  128                                 ms->fwsectors * ms->fwheads * ms->sectorsize;
  129                 }
  130                 if (bootverbose) {
  131                         printf("PC98 Slice %d on %s:\n", i + 1, gp->name);
  132                         g_pc98_print(i, dp + i);
  133                 }
  134                 if (s[i] < 0 || l[i] < 0)
  135                         error = EBUSY;
  136                 else
  137                         error = g_slice_config(gp, i, G_SLICE_CONFIG_CHECK,
  138                                        s[i], l[i], ms->sectorsize,
  139                                        "%ss%d", gp->name, i + 1);
  140                 if (error)
  141                         return (error);
  142         }
  143 
  144         for (i = 0; i < NDOSPART; i++) {
  145                 ms->type[i] = (dp[i].dp_sid << 8) | dp[i].dp_mid;
  146                 g_slice_config(gp, i, G_SLICE_CONFIG_SET, s[i], l[i],
  147                                ms->sectorsize, "%ss%d", gp->name, i + 1);
  148         }
  149 
  150         bcopy(sec, ms->sec, sizeof (ms->sec));
  151 
  152         return (0);
  153 }
  154 
  155 static int
  156 g_pc98_ioctl(struct g_provider *pp, u_long cmd, void *data, int fflag, struct thread *td)
  157 {
  158         struct g_geom *gp;
  159         struct g_pc98_softc *ms;
  160         struct g_slicer *gsp;
  161         struct g_consumer *cp;
  162         int error, opened;
  163 
  164         gp = pp->geom;
  165         gsp = gp->softc;
  166         ms = gsp->softc;
  167 
  168         opened = 0;
  169         error = 0;
  170         switch(cmd) {
  171         case DIOCSPC98: {
  172                 if (!(fflag & FWRITE))
  173                         return (EPERM);
  174                 DROP_GIANT();
  175                 g_topology_lock();
  176                 cp = LIST_FIRST(&gp->consumer);
  177                 if (cp->acw == 0) {
  178                         error = g_access(cp, 0, 1, 0);
  179                         if (error == 0)
  180                                 opened = 1;
  181                 }
  182                 if (!error)
  183                         error = g_pc98_modify(gp, ms, data, 8192);
  184                 if (!error)
  185                         error = g_write_data(cp, 0, data, 8192);
  186                 if (opened)
  187                         g_access(cp, 0, -1 , 0);
  188                 g_topology_unlock();
  189                 PICKUP_GIANT();
  190                 return(error);
  191         }
  192         default:
  193                 return (ENOIOCTL);
  194         }
  195 }
  196 
  197 static int
  198 g_pc98_start(struct bio *bp)
  199 {
  200         struct g_provider *pp;
  201         struct g_geom *gp;
  202         struct g_pc98_softc *mp;
  203         struct g_slicer *gsp;
  204         int idx;
  205 
  206         pp = bp->bio_to;
  207         idx = pp->index;
  208         gp = pp->geom;
  209         gsp = gp->softc;
  210         mp = gsp->softc;
  211         if (bp->bio_cmd == BIO_GETATTR) {
  212                 if (g_handleattr_int(bp, "PC98::type", mp->type[idx]))
  213                         return (1);
  214                 if (g_handleattr_off_t(bp, "PC98::offset",
  215                                        gsp->slices[idx].offset))
  216                         return (1);
  217         }
  218 
  219         return (0);
  220 }
  221 
  222 static void
  223 g_pc98_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
  224                 struct g_consumer *cp __unused, struct g_provider *pp)
  225 {
  226         struct g_pc98_softc *mp;
  227         struct g_slicer *gsp;
  228         struct pc98_partition dp;
  229         char sname[17];
  230 
  231         gsp = gp->softc;
  232         mp = gsp->softc;
  233         g_slice_dumpconf(sb, indent, gp, cp, pp);
  234         if (pp != NULL) {
  235                 pc98_partition_dec(
  236                         mp->sec + 512 +
  237                         pp->index * sizeof(struct pc98_partition), &dp);
  238                 strncpy(sname, dp.dp_name, 16);
  239                 sname[16] = '\0';
  240                 if (indent == NULL) {
  241                         sbuf_printf(sb, " ty %d", mp->type[pp->index]);
  242                         sbuf_printf(sb, " sn %s", sname);
  243                 } else {
  244                         sbuf_printf(sb, "%s<type>%d</type>\n", indent,
  245                                     mp->type[pp->index]);
  246                         sbuf_printf(sb, "%s<sname>%s</sname>\n", indent,
  247                                     sname);
  248                 }
  249         }
  250 }
  251 
  252 static struct g_geom *
  253 g_pc98_taste(struct g_class *mp, struct g_provider *pp, int flags)
  254 {
  255         struct g_geom *gp;
  256         struct g_consumer *cp;
  257         int error;
  258         struct g_pc98_softc *ms;
  259         u_int fwsectors, fwheads, sectorsize;
  260         u_char *buf;
  261 
  262         g_trace(G_T_TOPOLOGY, "g_pc98_taste(%s,%s)", mp->name, pp->name);
  263         g_topology_assert();
  264         if (flags == G_TF_NORMAL &&
  265             !strcmp(pp->geom->class->name, PC98_CLASS_NAME))
  266                 return (NULL);
  267         gp = g_slice_new(mp, NDOSPART, pp, &cp, &ms, sizeof *ms, g_pc98_start);
  268         if (gp == NULL)
  269                 return (NULL);
  270         g_topology_unlock();
  271         do {
  272                 if (gp->rank != 2 && flags == G_TF_NORMAL)
  273                         break;
  274                 error = g_getattr("GEOM::fwsectors", cp, &fwsectors);
  275                 if (error || fwsectors == 0) {
  276                         fwsectors = 17;
  277                         if (bootverbose)
  278                                 printf("g_pc98_taste: guessing %d sectors\n",
  279                                     fwsectors);
  280                 }
  281                 error = g_getattr("GEOM::fwheads", cp, &fwheads);
  282                 if (error || fwheads == 0) {
  283                         fwheads = 8;
  284                         if (bootverbose)
  285                                 printf("g_pc98_taste: guessing %d heads\n",
  286                                     fwheads);
  287                 }
  288                 sectorsize = cp->provider->sectorsize;
  289                 if (sectorsize % 512 != 0)
  290                         break;
  291                 buf = g_read_data(cp, 0, 8192, NULL);
  292                 if (buf == NULL)
  293                         break;
  294                 ms->fwsectors = fwsectors;
  295                 ms->fwheads = fwheads;
  296                 ms->sectorsize = sectorsize;
  297                 g_topology_lock();
  298                 g_pc98_modify(gp, ms, buf, 8192);
  299                 g_topology_unlock();
  300                 g_free(buf);
  301                 break;
  302         } while (0);
  303         g_topology_lock();
  304         g_access(cp, -1, 0, 0);
  305         if (LIST_EMPTY(&gp->provider)) {
  306                 g_slice_spoiled(cp);
  307                 return (NULL);
  308         }
  309         return (gp);
  310 }
  311 
  312 static void
  313 g_pc98_config(struct gctl_req *req, struct g_class *mp, const char *verb)
  314 {
  315         struct g_geom *gp;
  316         struct g_consumer *cp;
  317         struct g_pc98_softc *ms;
  318         struct g_slicer *gsp;
  319         int opened = 0, error = 0;
  320         void *data;
  321         int len;
  322 
  323         g_topology_assert();
  324         gp = gctl_get_geom(req, mp, "geom");
  325         if (gp == NULL)
  326                 return;
  327         if (strcmp(verb, "write PC98")) {
  328                 gctl_error(req, "Unknown verb");
  329                 return;
  330         }
  331         gsp = gp->softc;
  332         ms = gsp->softc;
  333         data = gctl_get_param(req, "data", &len);
  334         if (data == NULL)
  335                 return;
  336         if (len < 8192 || (len % 512)) {
  337                 gctl_error(req, "Wrong request length");
  338                 return;
  339         }
  340         cp = LIST_FIRST(&gp->consumer);
  341         if (cp->acw == 0) {
  342                 error = g_access(cp, 0, 1, 0);
  343                 if (error == 0)
  344                         opened = 1;
  345         }
  346         if (!error)
  347                 error = g_pc98_modify(gp, ms, data, len);
  348         if (error)
  349                 gctl_error(req, "conflict with open slices");
  350         if (!error)
  351                 error = g_write_data(cp, 0, data, len);
  352         if (error)
  353                 gctl_error(req, "sector zero write failed");
  354         if (opened)
  355                 g_access(cp, 0, -1 , 0);
  356         return;
  357 }
  358 
  359 static struct g_class g_pc98_class = {
  360         .name = PC98_CLASS_NAME,
  361         .version = G_VERSION,
  362         .taste = g_pc98_taste,
  363         .dumpconf = g_pc98_dumpconf,
  364         .ctlreq = g_pc98_config,
  365         .ioctl = g_pc98_ioctl,
  366 };
  367 
  368 DECLARE_GEOM_CLASS(g_pc98_class, g_pc98);

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