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/9.0/sys/geom/geom_pc98.c 223921 2011-07-11 05:22:31Z ae $");
   35 
   36 #include <sys/param.h>
   37 #include <sys/endian.h>
   38 #include <sys/systm.h>
   39 #include <sys/sysctl.h>
   40 #include <sys/kernel.h>
   41 #include <sys/fcntl.h>
   42 #include <sys/malloc.h>
   43 #include <sys/bio.h>
   44 #include <sys/lock.h>
   45 #include <sys/mutex.h>
   46 #include <sys/sbuf.h>
   47 
   48 #include <sys/diskpc98.h>
   49 #include <geom/geom.h>
   50 #include <geom/geom_slice.h>
   51 
   52 FEATURE(geom_pc98, "GEOM NEC PC9800 partitioning support");
   53 
   54 #define PC98_CLASS_NAME "PC98"
   55 
   56 struct g_pc98_softc {
   57         u_int fwsectors, fwheads, sectorsize;
   58         int type[NDOSPART];
   59         u_char sec[8192];
   60 };
   61 
   62 static void
   63 g_pc98_print(int i, struct pc98_partition *dp)
   64 {
   65         char sname[17];
   66 
   67         strncpy(sname, dp->dp_name, 16);
   68         sname[16] = '\0';
   69 
   70         hexdump(dp, sizeof(dp[0]), NULL, 0);
   71         printf("[%d] mid:%d(0x%x) sid:%d(0x%x)",
   72                i, dp->dp_mid, dp->dp_mid, dp->dp_sid, dp->dp_sid);
   73         printf(" s:%d/%d/%d", dp->dp_scyl, dp->dp_shd, dp->dp_ssect);
   74         printf(" e:%d/%d/%d", dp->dp_ecyl, dp->dp_ehd, dp->dp_esect);
   75         printf(" sname:%s\n", sname);
   76 }
   77 
   78 /*
   79  * XXX: Add gctl_req arg and give good error msgs.
   80  * XXX: Check that length argument does not bring boot code inside any slice.
   81  */
   82 static int
   83 g_pc98_modify(struct g_geom *gp, struct g_pc98_softc *ms, u_char *sec, int len __unused)
   84 {
   85         int i, error;
   86         off_t s[NDOSPART], l[NDOSPART];
   87         struct pc98_partition dp[NDOSPART];
   88 
   89         g_topology_assert();
   90         
   91         if (sec[0x1fe] != 0x55 || sec[0x1ff] != 0xaa)
   92                 return (EBUSY);
   93 
   94 #if 0
   95         /*
   96          * By convetion, it seems that the ipl program has a jump at location
   97          * 0 to the real start of the boot loader.  By convetion, it appears
   98          * that after this jump, there's a string, terminated by at last one,
   99          * if not more, zeros, followed by the target of the jump.  FreeBSD's
  100          * pc98 boot0 uses 'IPL1' followed by 3 zeros here, likely for
  101          * compatibility with some older boot loader.  Linux98's boot loader
  102          * appears to use 'Linux 98' followed by only two.  GRUB/98 appears to
  103          * use 'GRUB/98 ' followed by none.  These last two appear to be
  104          * ported from the ia32 versions, but appear to show similar
  105          * convention.  Grub/98 has an additional NOP after the jmp, which
  106          * isn't present in others.
  107          *
  108          * The following test was inspired by looking only at partitions
  109          * with FreeBSD's boot0 (or one that it is compatible with).  As
  110          * such, if failed when other IPL programs were used.
  111          */
  112         if (sec[4] != 'I' || sec[5] != 'P' || sec[6] != 'L' || sec[7] != '1')
  113                 return (EBUSY);
  114 #endif
  115 
  116         for (i = 0; i < NDOSPART; i++)
  117                 pc98_partition_dec(
  118                         sec + 512 + i * sizeof(struct pc98_partition), &dp[i]);
  119 
  120         for (i = 0; i < NDOSPART; i++) {
  121                 /* If start and end are identical it's bogus */
  122                 if (dp[i].dp_ssect == dp[i].dp_esect &&
  123                     dp[i].dp_shd == dp[i].dp_ehd &&
  124                     dp[i].dp_scyl == dp[i].dp_ecyl)
  125                         s[i] = l[i] = 0;
  126                 else if (dp[i].dp_ecyl == 0)
  127                         s[i] = l[i] = 0;
  128                 else {
  129                         s[i] = (off_t)dp[i].dp_scyl *
  130                                 ms->fwsectors * ms->fwheads * ms->sectorsize;
  131                         l[i] = (off_t)(dp[i].dp_ecyl - dp[i].dp_scyl + 1) *
  132                                 ms->fwsectors * ms->fwheads * ms->sectorsize;
  133                 }
  134                 if (bootverbose) {
  135                         printf("PC98 Slice %d on %s:\n", i + 1, gp->name);
  136                         g_pc98_print(i, dp + i);
  137                 }
  138                 if (s[i] < 0 || l[i] < 0)
  139                         error = EBUSY;
  140                 else
  141                         error = g_slice_config(gp, i, G_SLICE_CONFIG_CHECK,
  142                                        s[i], l[i], ms->sectorsize,
  143                                        "%ss%d", gp->name, i + 1);
  144                 if (error)
  145                         return (error);
  146         }
  147 
  148         for (i = 0; i < NDOSPART; i++) {
  149                 ms->type[i] = (dp[i].dp_sid << 8) | dp[i].dp_mid;
  150                 g_slice_config(gp, i, G_SLICE_CONFIG_SET, s[i], l[i],
  151                                ms->sectorsize, "%ss%d", gp->name, i + 1);
  152         }
  153 
  154         bcopy(sec, ms->sec, sizeof (ms->sec));
  155 
  156         return (0);
  157 }
  158 
  159 static int
  160 g_pc98_ioctl(struct g_provider *pp, u_long cmd, void *data, int fflag, struct thread *td)
  161 {
  162         struct g_geom *gp;
  163         struct g_pc98_softc *ms;
  164         struct g_slicer *gsp;
  165         struct g_consumer *cp;
  166         int error, opened;
  167 
  168         gp = pp->geom;
  169         gsp = gp->softc;
  170         ms = gsp->softc;
  171 
  172         opened = 0;
  173         error = 0;
  174         switch(cmd) {
  175         case DIOCSPC98: {
  176                 if (!(fflag & FWRITE))
  177                         return (EPERM);
  178                 DROP_GIANT();
  179                 g_topology_lock();
  180                 cp = LIST_FIRST(&gp->consumer);
  181                 if (cp->acw == 0) {
  182                         error = g_access(cp, 0, 1, 0);
  183                         if (error == 0)
  184                                 opened = 1;
  185                 }
  186                 if (!error)
  187                         error = g_pc98_modify(gp, ms, data, 8192);
  188                 if (!error)
  189                         error = g_write_data(cp, 0, data, 8192);
  190                 if (opened)
  191                         g_access(cp, 0, -1 , 0);
  192                 g_topology_unlock();
  193                 PICKUP_GIANT();
  194                 return(error);
  195         }
  196         default:
  197                 return (ENOIOCTL);
  198         }
  199 }
  200 
  201 static int
  202 g_pc98_start(struct bio *bp)
  203 {
  204         struct g_provider *pp;
  205         struct g_geom *gp;
  206         struct g_pc98_softc *mp;
  207         struct g_slicer *gsp;
  208         int idx;
  209 
  210         pp = bp->bio_to;
  211         idx = pp->index;
  212         gp = pp->geom;
  213         gsp = gp->softc;
  214         mp = gsp->softc;
  215         if (bp->bio_cmd == BIO_GETATTR) {
  216                 if (g_handleattr_int(bp, "PC98::type", mp->type[idx]))
  217                         return (1);
  218                 if (g_handleattr_off_t(bp, "PC98::offset",
  219                                        gsp->slices[idx].offset))
  220                         return (1);
  221         }
  222 
  223         return (0);
  224 }
  225 
  226 static void
  227 g_pc98_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
  228                 struct g_consumer *cp __unused, struct g_provider *pp)
  229 {
  230         struct g_pc98_softc *mp;
  231         struct g_slicer *gsp;
  232         struct pc98_partition dp;
  233         char sname[17];
  234 
  235         gsp = gp->softc;
  236         mp = gsp->softc;
  237         g_slice_dumpconf(sb, indent, gp, cp, pp);
  238         if (pp != NULL) {
  239                 pc98_partition_dec(
  240                         mp->sec + 512 +
  241                         pp->index * sizeof(struct pc98_partition), &dp);
  242                 strncpy(sname, dp.dp_name, 16);
  243                 sname[16] = '\0';
  244                 if (indent == NULL) {
  245                         sbuf_printf(sb, " ty %d", mp->type[pp->index]);
  246                         sbuf_printf(sb, " sn %s", sname);
  247                 } else {
  248                         sbuf_printf(sb, "%s<type>%d</type>\n", indent,
  249                                     mp->type[pp->index]);
  250                         sbuf_printf(sb, "%s<sname>%s</sname>\n", indent,
  251                                     sname);
  252                 }
  253         }
  254 }
  255 
  256 static struct g_geom *
  257 g_pc98_taste(struct g_class *mp, struct g_provider *pp, int flags)
  258 {
  259         struct g_geom *gp;
  260         struct g_consumer *cp;
  261         int error;
  262         struct g_pc98_softc *ms;
  263         u_int fwsectors, fwheads, sectorsize;
  264         u_char *buf;
  265 
  266         g_trace(G_T_TOPOLOGY, "g_pc98_taste(%s,%s)", mp->name, pp->name);
  267         g_topology_assert();
  268         if (flags == G_TF_NORMAL &&
  269             !strcmp(pp->geom->class->name, PC98_CLASS_NAME))
  270                 return (NULL);
  271         gp = g_slice_new(mp, NDOSPART, pp, &cp, &ms, sizeof *ms, g_pc98_start);
  272         if (gp == NULL)
  273                 return (NULL);
  274         g_topology_unlock();
  275         do {
  276                 if (gp->rank != 2 && flags == G_TF_NORMAL)
  277                         break;
  278                 error = g_getattr("GEOM::fwsectors", cp, &fwsectors);
  279                 if (error || fwsectors == 0) {
  280                         fwsectors = 17;
  281                         if (bootverbose)
  282                                 printf("g_pc98_taste: guessing %d sectors\n",
  283                                     fwsectors);
  284                 }
  285                 error = g_getattr("GEOM::fwheads", cp, &fwheads);
  286                 if (error || fwheads == 0) {
  287                         fwheads = 8;
  288                         if (bootverbose)
  289                                 printf("g_pc98_taste: guessing %d heads\n",
  290                                     fwheads);
  291                 }
  292                 sectorsize = cp->provider->sectorsize;
  293                 if (sectorsize % 512 != 0)
  294                         break;
  295                 buf = g_read_data(cp, 0, 8192, NULL);
  296                 if (buf == NULL)
  297                         break;
  298                 ms->fwsectors = fwsectors;
  299                 ms->fwheads = fwheads;
  300                 ms->sectorsize = sectorsize;
  301                 g_topology_lock();
  302                 g_pc98_modify(gp, ms, buf, 8192);
  303                 g_topology_unlock();
  304                 g_free(buf);
  305                 break;
  306         } while (0);
  307         g_topology_lock();
  308         g_access(cp, -1, 0, 0);
  309         if (LIST_EMPTY(&gp->provider)) {
  310                 g_slice_spoiled(cp);
  311                 return (NULL);
  312         }
  313         return (gp);
  314 }
  315 
  316 static void
  317 g_pc98_config(struct gctl_req *req, struct g_class *mp, const char *verb)
  318 {
  319         struct g_geom *gp;
  320         struct g_consumer *cp;
  321         struct g_pc98_softc *ms;
  322         struct g_slicer *gsp;
  323         int opened = 0, error = 0;
  324         void *data;
  325         int len;
  326 
  327         g_topology_assert();
  328         gp = gctl_get_geom(req, mp, "geom");
  329         if (gp == NULL)
  330                 return;
  331         if (strcmp(verb, "write PC98")) {
  332                 gctl_error(req, "Unknown verb");
  333                 return;
  334         }
  335         gsp = gp->softc;
  336         ms = gsp->softc;
  337         data = gctl_get_param(req, "data", &len);
  338         if (data == NULL)
  339                 return;
  340         if (len < 8192 || (len % 512)) {
  341                 gctl_error(req, "Wrong request length");
  342                 return;
  343         }
  344         cp = LIST_FIRST(&gp->consumer);
  345         if (cp->acw == 0) {
  346                 error = g_access(cp, 0, 1, 0);
  347                 if (error == 0)
  348                         opened = 1;
  349         }
  350         if (!error)
  351                 error = g_pc98_modify(gp, ms, data, len);
  352         if (error)
  353                 gctl_error(req, "conflict with open slices");
  354         if (!error)
  355                 error = g_write_data(cp, 0, data, len);
  356         if (error)
  357                 gctl_error(req, "sector zero write failed");
  358         if (opened)
  359                 g_access(cp, 0, -1 , 0);
  360         return;
  361 }
  362 
  363 static struct g_class g_pc98_class = {
  364         .name = PC98_CLASS_NAME,
  365         .version = G_VERSION,
  366         .taste = g_pc98_taste,
  367         .dumpconf = g_pc98_dumpconf,
  368         .ctlreq = g_pc98_config,
  369         .ioctl = g_pc98_ioctl,
  370 };
  371 
  372 DECLARE_GEOM_CLASS(g_pc98_class, g_pc98);

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