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/10.0/sys/geom/geom_pc98.c 254015 2013-08-07 00:00:48Z marcel $");
   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/proc.h>
   47 #include <sys/sbuf.h>
   48 
   49 #include <sys/diskpc98.h>
   50 #include <geom/geom.h>
   51 #include <geom/geom_slice.h>
   52 
   53 FEATURE(geom_pc98, "GEOM NEC PC9800 partitioning support");
   54 
   55 #define PC98_CLASS_NAME "PC98"
   56 
   57 struct g_pc98_softc {
   58         u_int fwsectors, fwheads, sectorsize;
   59         int type[PC98_NPARTS];
   60         u_char sec[8192];
   61 };
   62 
   63 static void
   64 g_pc98_print(int i, struct pc98_partition *dp)
   65 {
   66         char sname[17];
   67 
   68         strncpy(sname, dp->dp_name, 16);
   69         sname[16] = '\0';
   70 
   71         hexdump(dp, sizeof(dp[0]), NULL, 0);
   72         printf("[%d] mid:%d(0x%x) sid:%d(0x%x)",
   73                i, dp->dp_mid, dp->dp_mid, dp->dp_sid, dp->dp_sid);
   74         printf(" s:%d/%d/%d", dp->dp_scyl, dp->dp_shd, dp->dp_ssect);
   75         printf(" e:%d/%d/%d", dp->dp_ecyl, dp->dp_ehd, dp->dp_esect);
   76         printf(" sname:%s\n", sname);
   77 }
   78 
   79 /*
   80  * XXX: Add gctl_req arg and give good error msgs.
   81  * XXX: Check that length argument does not bring boot code inside any slice.
   82  */
   83 static int
   84 g_pc98_modify(struct g_geom *gp, struct g_pc98_softc *ms, u_char *sec, int len __unused)
   85 {
   86         int i, error;
   87         off_t s[PC98_NPARTS], l[PC98_NPARTS];
   88         struct pc98_partition dp[PC98_NPARTS];
   89 
   90         g_topology_assert();
   91         
   92         if (sec[0x1fe] != 0x55 || sec[0x1ff] != 0xaa)
   93                 return (EBUSY);
   94 
   95 #if 0
   96         /*
   97          * By convetion, it seems that the ipl program has a jump at location
   98          * 0 to the real start of the boot loader.  By convetion, it appears
   99          * that after this jump, there's a string, terminated by at last one,
  100          * if not more, zeros, followed by the target of the jump.  FreeBSD's
  101          * pc98 boot0 uses 'IPL1' followed by 3 zeros here, likely for
  102          * compatibility with some older boot loader.  Linux98's boot loader
  103          * appears to use 'Linux 98' followed by only two.  GRUB/98 appears to
  104          * use 'GRUB/98 ' followed by none.  These last two appear to be
  105          * ported from the ia32 versions, but appear to show similar
  106          * convention.  Grub/98 has an additional NOP after the jmp, which
  107          * isn't present in others.
  108          *
  109          * The following test was inspired by looking only at partitions
  110          * with FreeBSD's boot0 (or one that it is compatible with).  As
  111          * such, if failed when other IPL programs were used.
  112          */
  113         if (sec[4] != 'I' || sec[5] != 'P' || sec[6] != 'L' || sec[7] != '1')
  114                 return (EBUSY);
  115 #endif
  116 
  117         for (i = 0; i < PC98_NPARTS; i++)
  118                 pc98_partition_dec(
  119                         sec + 512 + i * sizeof(struct pc98_partition), &dp[i]);
  120 
  121         for (i = 0; i < PC98_NPARTS; i++) {
  122                 /* If start and end are identical it's bogus */
  123                 if (dp[i].dp_ssect == dp[i].dp_esect &&
  124                     dp[i].dp_shd == dp[i].dp_ehd &&
  125                     dp[i].dp_scyl == dp[i].dp_ecyl)
  126                         s[i] = l[i] = 0;
  127                 else if (dp[i].dp_ecyl == 0)
  128                         s[i] = l[i] = 0;
  129                 else {
  130                         s[i] = (off_t)dp[i].dp_scyl *
  131                                 ms->fwsectors * ms->fwheads * ms->sectorsize;
  132                         l[i] = (off_t)(dp[i].dp_ecyl - dp[i].dp_scyl + 1) *
  133                                 ms->fwsectors * ms->fwheads * ms->sectorsize;
  134                 }
  135                 if (bootverbose) {
  136                         printf("PC98 Slice %d on %s:\n", i + 1, gp->name);
  137                         g_pc98_print(i, dp + i);
  138                 }
  139                 if (s[i] < 0 || l[i] < 0)
  140                         error = EBUSY;
  141                 else
  142                         error = g_slice_config(gp, i, G_SLICE_CONFIG_CHECK,
  143                                        s[i], l[i], ms->sectorsize,
  144                                        "%ss%d", gp->name, i + 1);
  145                 if (error)
  146                         return (error);
  147         }
  148 
  149         for (i = 0; i < PC98_NPARTS; i++) {
  150                 ms->type[i] = (dp[i].dp_sid << 8) | dp[i].dp_mid;
  151                 g_slice_config(gp, i, G_SLICE_CONFIG_SET, s[i], l[i],
  152                                ms->sectorsize, "%ss%d", gp->name, i + 1);
  153         }
  154 
  155         bcopy(sec, ms->sec, sizeof (ms->sec));
  156 
  157         return (0);
  158 }
  159 
  160 static int
  161 g_pc98_ioctl(struct g_provider *pp, u_long cmd, void *data, int fflag, struct thread *td)
  162 {
  163         struct g_geom *gp;
  164         struct g_pc98_softc *ms;
  165         struct g_slicer *gsp;
  166         struct g_consumer *cp;
  167         int error, opened;
  168 
  169         gp = pp->geom;
  170         gsp = gp->softc;
  171         ms = gsp->softc;
  172 
  173         opened = 0;
  174         error = 0;
  175         switch(cmd) {
  176         case DIOCSPC98: {
  177                 if (!(fflag & FWRITE))
  178                         return (EPERM);
  179                 DROP_GIANT();
  180                 g_topology_lock();
  181                 cp = LIST_FIRST(&gp->consumer);
  182                 if (cp->acw == 0) {
  183                         error = g_access(cp, 0, 1, 0);
  184                         if (error == 0)
  185                                 opened = 1;
  186                 }
  187                 if (!error)
  188                         error = g_pc98_modify(gp, ms, data, 8192);
  189                 if (!error)
  190                         error = g_write_data(cp, 0, data, 8192);
  191                 if (opened)
  192                         g_access(cp, 0, -1 , 0);
  193                 g_topology_unlock();
  194                 PICKUP_GIANT();
  195                 return(error);
  196         }
  197         default:
  198                 return (ENOIOCTL);
  199         }
  200 }
  201 
  202 static int
  203 g_pc98_start(struct bio *bp)
  204 {
  205         struct g_provider *pp;
  206         struct g_geom *gp;
  207         struct g_pc98_softc *mp;
  208         struct g_slicer *gsp;
  209         int idx;
  210 
  211         pp = bp->bio_to;
  212         idx = pp->index;
  213         gp = pp->geom;
  214         gsp = gp->softc;
  215         mp = gsp->softc;
  216         if (bp->bio_cmd == BIO_GETATTR) {
  217                 if (g_handleattr_int(bp, "PC98::type", mp->type[idx]))
  218                         return (1);
  219                 if (g_handleattr_off_t(bp, "PC98::offset",
  220                                        gsp->slices[idx].offset))
  221                         return (1);
  222         }
  223 
  224         return (0);
  225 }
  226 
  227 static void
  228 g_pc98_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
  229                 struct g_consumer *cp __unused, struct g_provider *pp)
  230 {
  231         struct g_pc98_softc *mp;
  232         struct g_slicer *gsp;
  233         struct pc98_partition dp;
  234         char sname[17];
  235 
  236         gsp = gp->softc;
  237         mp = gsp->softc;
  238         g_slice_dumpconf(sb, indent, gp, cp, pp);
  239         if (pp != NULL) {
  240                 pc98_partition_dec(
  241                         mp->sec + 512 +
  242                         pp->index * sizeof(struct pc98_partition), &dp);
  243                 strncpy(sname, dp.dp_name, 16);
  244                 sname[16] = '\0';
  245                 if (indent == NULL) {
  246                         sbuf_printf(sb, " ty %d", mp->type[pp->index]);
  247                         sbuf_printf(sb, " sn %s", sname);
  248                 } else {
  249                         sbuf_printf(sb, "%s<type>%d</type>\n", indent,
  250                                     mp->type[pp->index]);
  251                         sbuf_printf(sb, "%s<sname>%s</sname>\n", indent,
  252                                     sname);
  253                 }
  254         }
  255 }
  256 
  257 static struct g_geom *
  258 g_pc98_taste(struct g_class *mp, struct g_provider *pp, int flags)
  259 {
  260         struct g_geom *gp;
  261         struct g_consumer *cp;
  262         int error;
  263         struct g_pc98_softc *ms;
  264         u_int fwsectors, fwheads, sectorsize;
  265         u_char *buf;
  266 
  267         g_trace(G_T_TOPOLOGY, "g_pc98_taste(%s,%s)", mp->name, pp->name);
  268         g_topology_assert();
  269         if (flags == G_TF_NORMAL &&
  270             !strcmp(pp->geom->class->name, PC98_CLASS_NAME))
  271                 return (NULL);
  272         gp = g_slice_new(mp, PC98_NPARTS, pp, &cp, &ms, sizeof *ms,
  273             g_pc98_start);
  274         if (gp == NULL)
  275                 return (NULL);
  276         g_topology_unlock();
  277         do {
  278                 if (gp->rank != 2 && flags == G_TF_NORMAL)
  279                         break;
  280                 error = g_getattr("GEOM::fwsectors", cp, &fwsectors);
  281                 if (error || fwsectors == 0) {
  282                         fwsectors = 17;
  283                         if (bootverbose)
  284                                 printf("g_pc98_taste: guessing %d sectors\n",
  285                                     fwsectors);
  286                 }
  287                 error = g_getattr("GEOM::fwheads", cp, &fwheads);
  288                 if (error || fwheads == 0) {
  289                         fwheads = 8;
  290                         if (bootverbose)
  291                                 printf("g_pc98_taste: guessing %d heads\n",
  292                                     fwheads);
  293                 }
  294                 sectorsize = cp->provider->sectorsize;
  295                 if (sectorsize % 512 != 0)
  296                         break;
  297                 buf = g_read_data(cp, 0, 8192, NULL);
  298                 if (buf == NULL)
  299                         break;
  300                 ms->fwsectors = fwsectors;
  301                 ms->fwheads = fwheads;
  302                 ms->sectorsize = sectorsize;
  303                 g_topology_lock();
  304                 g_pc98_modify(gp, ms, buf, 8192);
  305                 g_topology_unlock();
  306                 g_free(buf);
  307                 break;
  308         } while (0);
  309         g_topology_lock();
  310         g_access(cp, -1, 0, 0);
  311         if (LIST_EMPTY(&gp->provider)) {
  312                 g_slice_spoiled(cp);
  313                 return (NULL);
  314         }
  315         return (gp);
  316 }
  317 
  318 static void
  319 g_pc98_config(struct gctl_req *req, struct g_class *mp, const char *verb)
  320 {
  321         struct g_geom *gp;
  322         struct g_consumer *cp;
  323         struct g_pc98_softc *ms;
  324         struct g_slicer *gsp;
  325         int opened = 0, error = 0;
  326         void *data;
  327         int len;
  328 
  329         g_topology_assert();
  330         gp = gctl_get_geom(req, mp, "geom");
  331         if (gp == NULL)
  332                 return;
  333         if (strcmp(verb, "write PC98")) {
  334                 gctl_error(req, "Unknown verb");
  335                 return;
  336         }
  337         gsp = gp->softc;
  338         ms = gsp->softc;
  339         data = gctl_get_param(req, "data", &len);
  340         if (data == NULL)
  341                 return;
  342         if (len < 8192 || (len % 512)) {
  343                 gctl_error(req, "Wrong request length");
  344                 return;
  345         }
  346         cp = LIST_FIRST(&gp->consumer);
  347         if (cp->acw == 0) {
  348                 error = g_access(cp, 0, 1, 0);
  349                 if (error == 0)
  350                         opened = 1;
  351         }
  352         if (!error)
  353                 error = g_pc98_modify(gp, ms, data, len);
  354         if (error)
  355                 gctl_error(req, "conflict with open slices");
  356         if (!error)
  357                 error = g_write_data(cp, 0, data, len);
  358         if (error)
  359                 gctl_error(req, "sector zero write failed");
  360         if (opened)
  361                 g_access(cp, 0, -1 , 0);
  362         return;
  363 }
  364 
  365 static struct g_class g_pc98_class = {
  366         .name = PC98_CLASS_NAME,
  367         .version = G_VERSION,
  368         .taste = g_pc98_taste,
  369         .dumpconf = g_pc98_dumpconf,
  370         .ctlreq = g_pc98_config,
  371         .ioctl = g_pc98_ioctl,
  372 };
  373 
  374 DECLARE_GEOM_CLASS(g_pc98_class, g_pc98);

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