sys/geom/part/g_part_pc98.c

   1 /*-
   2  * Copyright (c) 2008 Marcel Moolenaar
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28 __FBSDID("$FreeBSD$");
  29
  30 #include <sys/param.h>
  31 #include <sys/bio.h>
  32 #include <sys/diskpc98.h>
  33 #include <sys/endian.h>
  34 #include <sys/kernel.h>
  35 #include <sys/kobj.h>
  36 #include <sys/limits.h>
  37 #include <sys/lock.h>
  38 #include <sys/malloc.h>
  39 #include <sys/mutex.h>
  40 #include <sys/queue.h>
  41 #include <sys/sbuf.h>
  42 #include <sys/systm.h>
  43 #include <sys/sysctl.h>
  44 #include <geom/geom.h>
  45 #include <geom/geom_int.h>
  46 #include <geom/part/g_part.h>
  47
  48 #include "g_part_if.h"
  49
  50 FEATURE(geom_part_pc98, "GEOM partitioning class for PC-9800 disk partitions");
  51
  52 #define SECSIZE         512
  53 #define MENUSIZE        7168
  54 #define BOOTSIZE        8192
  55
  56 struct g_part_pc98_table {
  57         struct g_part_table     base;
  58         u_char          boot[SECSIZE];
  59         u_char          table[SECSIZE];
  60         u_char          menu[MENUSIZE];
  61 };
  62
  63 struct g_part_pc98_entry {
  64         struct g_part_entry     base;
  65         struct pc98_partition ent;
  66 };
  67
  68 static int g_part_pc98_add(struct g_part_table *, struct g_part_entry *,
  69     struct g_part_parms *);
  70 static int g_part_pc98_bootcode(struct g_part_table *, struct g_part_parms *);
  71 static int g_part_pc98_create(struct g_part_table *, struct g_part_parms *);
  72 static int g_part_pc98_destroy(struct g_part_table *, struct g_part_parms *);
  73 static void g_part_pc98_dumpconf(struct g_part_table *, struct g_part_entry *,
  74     struct sbuf *, const char *);
  75 static int g_part_pc98_dumpto(struct g_part_table *, struct g_part_entry *);
  76 static int g_part_pc98_modify(struct g_part_table *, struct g_part_entry *,
  77     struct g_part_parms *);
  78 static const char *g_part_pc98_name(struct g_part_table *, struct g_part_entry *,
  79     char *, size_t);
  80 static int g_part_pc98_probe(struct g_part_table *, struct g_consumer *);
  81 static int g_part_pc98_read(struct g_part_table *, struct g_consumer *);
  82 static int g_part_pc98_setunset(struct g_part_table *, struct g_part_entry *,
  83     const char *, unsigned int);
  84 static const char *g_part_pc98_type(struct g_part_table *,
  85     struct g_part_entry *, char *, size_t);
  86 static int g_part_pc98_write(struct g_part_table *, struct g_consumer *);
  87 static int g_part_pc98_resize(struct g_part_table *, struct g_part_entry *,
  88     struct g_part_parms *);
  89
  90 static kobj_method_t g_part_pc98_methods[] = {
  91         KOBJMETHOD(g_part_add,          g_part_pc98_add),
  92         KOBJMETHOD(g_part_bootcode,     g_part_pc98_bootcode),
  93         KOBJMETHOD(g_part_create,       g_part_pc98_create),
  94         KOBJMETHOD(g_part_destroy,      g_part_pc98_destroy),
  95         KOBJMETHOD(g_part_dumpconf,     g_part_pc98_dumpconf),
  96         KOBJMETHOD(g_part_dumpto,       g_part_pc98_dumpto),
  97         KOBJMETHOD(g_part_modify,       g_part_pc98_modify),
  98         KOBJMETHOD(g_part_resize,       g_part_pc98_resize),
  99         KOBJMETHOD(g_part_name,         g_part_pc98_name),
 100         KOBJMETHOD(g_part_probe,        g_part_pc98_probe),
 101         KOBJMETHOD(g_part_read,         g_part_pc98_read),
 102         KOBJMETHOD(g_part_setunset,     g_part_pc98_setunset),
 103         KOBJMETHOD(g_part_type,         g_part_pc98_type),
 104         KOBJMETHOD(g_part_write,        g_part_pc98_write),
 105         { 0, 0 }
 106 };
 107
 108 static struct g_part_scheme g_part_pc98_scheme = {
 109         "PC98",
 110         g_part_pc98_methods,
 111         sizeof(struct g_part_pc98_table),
 112         .gps_entrysz = sizeof(struct g_part_pc98_entry),
 113         .gps_minent = PC98_NPARTS,
 114         .gps_maxent = PC98_NPARTS,
 115         .gps_bootcodesz = BOOTSIZE,
 116 };
 117 G_PART_SCHEME_DECLARE(g_part_pc98);
 118
 119 static int
 120 pc98_parse_type(const char *type, u_char *dp_mid, u_char *dp_sid)
 121 {
 122         const char *alias;
 123         char *endp;
 124         long lt;
 125
 126         if (type[0] == '!') {
 127                 lt = strtol(type + 1, &endp, 0);
 128                 if (type[1] == '\0' || *endp != '\0' || lt <= 0 ||
 129                     lt >= 65536)
 130                         return (EINVAL);
 131                 /* Make sure the active and bootable flags aren't set. */
 132                 if (lt & ((PC98_SID_ACTIVE << 8) | PC98_MID_BOOTABLE))
 133                         return (ENOATTR);
 134                 *dp_mid = (*dp_mid & PC98_MID_BOOTABLE) | (u_char)lt;
 135                 *dp_sid = (*dp_sid & PC98_SID_ACTIVE) | (u_char)(lt >> 8);
 136                 return (0);
 137         }
 138         alias = g_part_alias_name(G_PART_ALIAS_FREEBSD);
 139         if (!strcasecmp(type, alias)) {
 140                 *dp_mid = (*dp_mid & PC98_MID_BOOTABLE) | PC98_MID_386BSD;
 141                 *dp_sid = (*dp_sid & PC98_SID_ACTIVE) | PC98_SID_386BSD;
 142                 return (0);
 143         }
 144         return (EINVAL);
 145 }
 146
 147 static int
 148 pc98_set_slicename(const char *label, u_char *dp_name)
 149 {
 150         int len;
 151
 152         len = strlen(label);
 153         if (len > sizeof(((struct pc98_partition *)NULL)->dp_name))
 154                 return (EINVAL);
 155         bzero(dp_name, sizeof(((struct pc98_partition *)NULL)->dp_name));
 156         strncpy(dp_name, label, len);
 157
 158         return (0);
 159 }
 160
 161 static void
 162 pc98_set_chs(struct g_part_table *table, uint32_t lba, u_short *cylp,
 163     u_char *hdp, u_char *secp)
 164 {
 165         uint32_t cyl, hd, sec;
 166
 167         sec = lba % table->gpt_sectors + 1;
 168         lba /= table->gpt_sectors;
 169         hd = lba % table->gpt_heads;
 170         lba /= table->gpt_heads;
 171         cyl = lba;
 172
 173         *cylp = htole16(cyl);
 174         *hdp = hd;
 175         *secp = sec;
 176 }
 177
 178 static int
 179 pc98_align(struct g_part_table *basetable, uint32_t *start, uint32_t *size)
 180 {
 181         uint32_t cyl;
 182
 183         cyl = basetable->gpt_heads * basetable->gpt_sectors;
 184         if (*size < cyl)
 185                 return (EINVAL);
 186         if (start != NULL && (*start % cyl)) {
 187                 *size += (*start % cyl) - cyl;
 188                 *start -= (*start % cyl) - cyl;
 189         }
 190         if (*size % cyl)
 191                 *size -= (*size % cyl);
 192         if (*size < cyl)
 193                 return (EINVAL);
 194         return (0);
 195 }
 196
 197 static int
 198 g_part_pc98_add(struct g_part_table *basetable, struct g_part_entry *baseentry,
 199     struct g_part_parms *gpp)
 200 {
 201         struct g_part_pc98_entry *entry;
 202         uint32_t start, size;
 203         int error;
 204
 205         entry = (struct g_part_pc98_entry *)baseentry;
 206         start = gpp->gpp_start;
 207         size = gpp->gpp_size;
 208         if (pc98_align(basetable, &start, &size) != 0)
 209                 return (EINVAL);
 210         if (baseentry->gpe_deleted)
 211                 bzero(&entry->ent, sizeof(entry->ent));
 212         else
 213                 entry->ent.dp_mid = entry->ent.dp_sid = 0;
 214
 215         KASSERT(baseentry->gpe_start <= start, (__func__));
 216         KASSERT(baseentry->gpe_end >= start + size - 1, (__func__));
 217         baseentry->gpe_start = start;
 218         baseentry->gpe_end = start + size - 1;
 219         pc98_set_chs(basetable, baseentry->gpe_start, &entry->ent.dp_scyl,
 220             &entry->ent.dp_shd, &entry->ent.dp_ssect);
 221         pc98_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl,
 222             &entry->ent.dp_ehd, &entry->ent.dp_esect);
 223
 224         error = pc98_parse_type(gpp->gpp_type, &entry->ent.dp_mid,
 225             &entry->ent.dp_sid);
 226         if (error)
 227                 return (error);
 228
 229         if (gpp->gpp_parms & G_PART_PARM_LABEL)
 230                 return (pc98_set_slicename(gpp->gpp_label, entry->ent.dp_name));
 231
 232         return (0);
 233 }
 234
 235 static int
 236 g_part_pc98_bootcode(struct g_part_table *basetable, struct g_part_parms *gpp)
 237 {
 238         struct g_part_pc98_table *table;
 239         const u_char *codeptr;
 240
 241         if (gpp->gpp_codesize != BOOTSIZE)
 242                 return (EINVAL);
 243
 244         table = (struct g_part_pc98_table *)basetable;
 245         codeptr = gpp->gpp_codeptr;
 246         bcopy(codeptr, table->boot, SECSIZE);
 247         bcopy(codeptr + SECSIZE*2, table->menu, MENUSIZE);
 248
 249         return (0);
 250 }
 251
 252 static int
 253 g_part_pc98_create(struct g_part_table *basetable, struct g_part_parms *gpp)
 254 {
 255         struct g_provider *pp;
 256         struct g_part_pc98_table *table;
 257
 258         pp = gpp->gpp_provider;
 259         if (pp->sectorsize < SECSIZE || pp->mediasize < BOOTSIZE)
 260                 return (ENOSPC);
 261         if (pp->sectorsize > SECSIZE)
 262                 return (ENXIO);
 263
 264         basetable->gpt_first = basetable->gpt_heads * basetable->gpt_sectors;
 265         basetable->gpt_last = MIN(pp->mediasize / SECSIZE, UINT32_MAX) - 1;
 266
 267         table = (struct g_part_pc98_table *)basetable;
 268         le16enc(table->boot + PC98_MAGICOFS, PC98_MAGIC);
 269         return (0);
 270 }
 271
 272 static int
 273 g_part_pc98_destroy(struct g_part_table *basetable, struct g_part_parms *gpp)
 274 {
 275
 276         /* Wipe the first two sectors to clear the partitioning. */
 277         basetable->gpt_smhead |= 3;
 278         return (0);
 279 }
 280
 281 static void
 282 g_part_pc98_dumpconf(struct g_part_table *table,
 283     struct g_part_entry *baseentry, struct sbuf *sb, const char *indent)
 284 {
 285         struct g_part_pc98_entry *entry;
 286         char name[sizeof(entry->ent.dp_name) + 1];
 287         u_int type;
 288
 289         entry = (struct g_part_pc98_entry *)baseentry;
 290         if (entry == NULL) {
 291                 /* confxml: scheme information */
 292                 return;
 293         }
 294
 295         type = entry->ent.dp_mid + (entry->ent.dp_sid << 8);
 296         strncpy(name, entry->ent.dp_name, sizeof(name) - 1);
 297         name[sizeof(name) - 1] = '\0';
 298         if (indent == NULL) {
 299                 /* conftxt: libdisk compatibility */
 300                 sbuf_printf(sb, " xs PC98 xt %u sn %s", type, name);
 301         } else {
 302                 /* confxml: partition entry information */
 303                 sbuf_printf(sb, "%s<label>", indent);
 304                 g_conf_printf_escaped(sb, "%s", name);
 305                 sbuf_printf(sb, "</label>\n");
 306                 if (entry->ent.dp_mid & PC98_MID_BOOTABLE)
 307                         sbuf_printf(sb, "%s<attrib>bootable</attrib>\n",
 308                             indent);
 309                 if (entry->ent.dp_sid & PC98_SID_ACTIVE)
 310                         sbuf_printf(sb, "%s<attrib>active</attrib>\n", indent);
 311                 sbuf_printf(sb, "%s<rawtype>%u</rawtype>\n", indent,
 312                     type & 0x7f7f);
 313         }
 314 }
 315
 316 static int
 317 g_part_pc98_dumpto(struct g_part_table *table, struct g_part_entry *baseentry)
 318 {
 319         struct g_part_pc98_entry *entry;
 320
 321         /* Allow dumping to a FreeBSD partition only. */
 322         entry = (struct g_part_pc98_entry *)baseentry;
 323         return (((entry->ent.dp_mid & PC98_MID_MASK) == PC98_MID_386BSD &&
 324             (entry->ent.dp_sid & PC98_SID_MASK) == PC98_SID_386BSD) ? 1 : 0);
 325 }
 326
 327 static int
 328 g_part_pc98_modify(struct g_part_table *basetable,
 329     struct g_part_entry *baseentry, struct g_part_parms *gpp)
 330 {
 331         struct g_part_pc98_entry *entry;
 332         int error;
 333
 334         entry = (struct g_part_pc98_entry *)baseentry;
 335
 336         if (gpp->gpp_parms & G_PART_PARM_TYPE) {
 337                 error = pc98_parse_type(gpp->gpp_type, &entry->ent.dp_mid,
 338                     &entry->ent.dp_sid);
 339                 if (error)
 340                         return (error);
 341         }
 342
 343         if (gpp->gpp_parms & G_PART_PARM_LABEL)
 344                 return (pc98_set_slicename(gpp->gpp_label, entry->ent.dp_name));
 345
 346         return (0);
 347 }
 348
 349 static int
 350 g_part_pc98_resize(struct g_part_table *basetable,
 351     struct g_part_entry *baseentry, struct g_part_parms *gpp)
 352 {
 353         struct g_part_pc98_entry *entry;
 354         struct g_provider *pp;
 355         uint32_t size;
 356
 357         if (baseentry == NULL) {
 358                 pp = LIST_FIRST(&basetable->gpt_gp->consumer)->provider;
 359                 basetable->gpt_last = MIN(pp->mediasize / SECSIZE,
 360                     UINT32_MAX) - 1;
 361                 return (0);
 362         }
 363         size = gpp->gpp_size;
 364         if (pc98_align(basetable, NULL, &size) != 0)
 365                 return (EINVAL);
 366         /* XXX: prevent unexpected shrinking. */
 367         pp = baseentry->gpe_pp;
 368         if ((g_debugflags & 0x10) == 0 && size < gpp->gpp_size &&
 369             pp->mediasize / pp->sectorsize > size)
 370                 return (EBUSY);
 371         entry = (struct g_part_pc98_entry *)baseentry;
 372         baseentry->gpe_end = baseentry->gpe_start + size - 1;
 373         pc98_set_chs(basetable, baseentry->gpe_end, &entry->ent.dp_ecyl,
 374             &entry->ent.dp_ehd, &entry->ent.dp_esect);
 375
 376         return (0);
 377 }
 378
 379 static const char *
 380 g_part_pc98_name(struct g_part_table *table, struct g_part_entry *baseentry,
 381     char *buf, size_t bufsz)
 382 {
 383
 384         snprintf(buf, bufsz, "s%d", baseentry->gpe_index);
 385         return (buf);
 386 }
 387
 388 static int
 389 g_part_pc98_probe(struct g_part_table *table, struct g_consumer *cp)
 390 {
 391         struct g_provider *pp;
 392         u_char *buf, *p;
 393         int error, index, res, sum;
 394         uint16_t magic, ecyl, scyl;
 395
 396         pp = cp->provider;
 397
 398         /* Sanity-check the provider. */
 399         if (pp->sectorsize < SECSIZE || pp->mediasize < BOOTSIZE)
 400                 return (ENOSPC);
 401         if (pp->sectorsize > SECSIZE)
 402                 return (ENXIO);
 403
 404         /* Check that there's a PC98 partition table. */
 405         buf = g_read_data(cp, 0L, 2 * SECSIZE, &error);
 406         if (buf == NULL)
 407                 return (error);
 408
 409         /* We goto out on mismatch. */
 410         res = ENXIO;
 411
 412         magic = le16dec(buf + PC98_MAGICOFS);
 413         if (magic != PC98_MAGIC)
 414                 goto out;
 415
 416         sum = 0;
 417         for (index = SECSIZE; index < 2 * SECSIZE; index++)
 418                 sum += buf[index];
 419         if (sum == 0) {
 420                 res = G_PART_PROBE_PRI_LOW;
 421                 goto out;
 422         }
 423
 424         for (index = 0; index < PC98_NPARTS; index++) {
 425                 p = buf + SECSIZE + index * PC98_PARTSIZE;
 426                 if (p[0] == 0 || p[1] == 0)     /* !dp_mid || !dp_sid */
 427                         continue;
 428                 scyl = le16dec(p + 10);
 429                 ecyl = le16dec(p + 14);
 430                 if (scyl == 0 || ecyl == 0)
 431                         goto out;
 432                 if (p[8] == p[12] &&            /* dp_ssect == dp_esect */
 433                     p[9] == p[13] &&            /* dp_shd == dp_ehd */
 434                     scyl == ecyl)
 435                         goto out;
 436         }
 437
 438         res = G_PART_PROBE_PRI_HIGH;
 439
 440  out:
 441         g_free(buf);
 442         return (res);
 443 }
 444
 445 static int
 446 g_part_pc98_read(struct g_part_table *basetable, struct g_consumer *cp)
 447 {
 448         struct pc98_partition ent;
 449         struct g_provider *pp;
 450         struct g_part_pc98_table *table;
 451         struct g_part_pc98_entry *entry;
 452         u_char *buf, *p;
 453         off_t msize;
 454         off_t start, end;
 455         u_int cyl;
 456         int error, index;
 457
 458         pp = cp->provider;
 459         table = (struct g_part_pc98_table *)basetable;
 460         msize = MIN(pp->mediasize / SECSIZE, UINT32_MAX);
 461
 462         buf = g_read_data(cp, 0L, BOOTSIZE, &error);
 463         if (buf == NULL)
 464                 return (error);
 465
 466         cyl = basetable->gpt_heads * basetable->gpt_sectors;
 467
 468         bcopy(buf, table->boot, sizeof(table->boot));
 469         bcopy(buf + SECSIZE, table->table, sizeof(table->table));
 470         bcopy(buf + SECSIZE*2, table->menu, sizeof(table->menu));
 471
 472         for (index = PC98_NPARTS - 1; index >= 0; index--) {
 473                 p = buf + SECSIZE + index * PC98_PARTSIZE;
 474                 ent.dp_mid = p[0];
 475                 ent.dp_sid = p[1];
 476                 ent.dp_dum1 = p[2];
 477                 ent.dp_dum2 = p[3];
 478                 ent.dp_ipl_sct = p[4];
 479                 ent.dp_ipl_head = p[5];
 480                 ent.dp_ipl_cyl = le16dec(p + 6);
 481                 ent.dp_ssect = p[8];
 482                 ent.dp_shd = p[9];
 483                 ent.dp_scyl = le16dec(p + 10);
 484                 ent.dp_esect = p[12];
 485                 ent.dp_ehd = p[13];
 486                 ent.dp_ecyl = le16dec(p + 14);
 487                 bcopy(p + 16, ent.dp_name, sizeof(ent.dp_name));
 488                 if (ent.dp_sid == 0)
 489                         continue;
 490
 491                 start = ent.dp_scyl * cyl;
 492                 end = (ent.dp_ecyl + 1) * cyl - 1;
 493                 entry = (struct g_part_pc98_entry *)g_part_new_entry(basetable,
 494                     index + 1, start, end);
 495                 entry->ent = ent;
 496         }
 497
 498         basetable->gpt_entries = PC98_NPARTS;
 499         basetable->gpt_first = cyl;
 500         basetable->gpt_last = msize - 1;
 501
 502         g_free(buf);
 503         return (0);
 504 }
 505
 506 static int
 507 g_part_pc98_setunset(struct g_part_table *table, struct g_part_entry *baseentry,
 508     const char *attrib, unsigned int set)
 509 {
 510         struct g_part_entry *iter;
 511         struct g_part_pc98_entry *entry;
 512         int changed, mid, sid;
 513
 514         if (baseentry == NULL)
 515                 return (ENODEV);
 516
 517         mid = sid = 0;
 518         if (strcasecmp(attrib, "active") == 0)
 519                 sid = 1;
 520         else if (strcasecmp(attrib, "bootable") == 0)
 521                 mid = 1;
 522         if (mid == 0 && sid == 0)
 523                 return (EINVAL);
 524
 525         LIST_FOREACH(iter, &table->gpt_entry, gpe_entry) {
 526                 if (iter->gpe_deleted)
 527                         continue;
 528                 if (iter != baseentry)
 529                         continue;
 530                 changed = 0;
 531                 entry = (struct g_part_pc98_entry *)iter;
 532                 if (set) {
 533                         if (mid && !(entry->ent.dp_mid & PC98_MID_BOOTABLE)) {
 534                                 entry->ent.dp_mid |= PC98_MID_BOOTABLE;
 535                                 changed = 1;
 536                         }
 537                         if (sid && !(entry->ent.dp_sid & PC98_SID_ACTIVE)) {
 538                                 entry->ent.dp_sid |= PC98_SID_ACTIVE;
 539                                 changed = 1;
 540                         }
 541                 } else {
 542                         if (mid && (entry->ent.dp_mid & PC98_MID_BOOTABLE)) {
 543                                 entry->ent.dp_mid &= ~PC98_MID_BOOTABLE;
 544                                 changed = 1;
 545                         }
 546                         if (sid && (entry->ent.dp_sid & PC98_SID_ACTIVE)) {
 547                                 entry->ent.dp_sid &= ~PC98_SID_ACTIVE;
 548                                 changed = 1;
 549                         }
 550                 }
 551                 if (changed && !iter->gpe_created)
 552                         iter->gpe_modified = 1;
 553         }
 554         return (0);
 555 }
 556
 557 static const char *
 558 g_part_pc98_type(struct g_part_table *basetable, struct g_part_entry *baseentry,
 559     char *buf, size_t bufsz)
 560 {
 561         struct g_part_pc98_entry *entry;
 562         u_int type;
 563
 564         entry = (struct g_part_pc98_entry *)baseentry;
 565         type = (entry->ent.dp_mid & PC98_MID_MASK) |
 566             ((entry->ent.dp_sid & PC98_SID_MASK) << 8);
 567         if (type == (PC98_MID_386BSD | (PC98_SID_386BSD << 8)))
 568                 return (g_part_alias_name(G_PART_ALIAS_FREEBSD));
 569         snprintf(buf, bufsz, "!%d", type);
 570         return (buf);
 571 }
 572
 573 static int
 574 g_part_pc98_write(struct g_part_table *basetable, struct g_consumer *cp)
 575 {
 576         struct g_part_entry *baseentry;
 577         struct g_part_pc98_entry *entry;
 578         struct g_part_pc98_table *table;
 579         u_char *p;
 580         int error, index;
 581
 582         table = (struct g_part_pc98_table *)basetable;
 583         baseentry = LIST_FIRST(&basetable->gpt_entry);
 584         for (index = 1; index <= basetable->gpt_entries; index++) {
 585                 p = table->table + (index - 1) * PC98_PARTSIZE;
 586                 entry = (baseentry != NULL && index == baseentry->gpe_index)
 587                     ? (struct g_part_pc98_entry *)baseentry : NULL;
 588                 if (entry != NULL && !baseentry->gpe_deleted) {
 589                         p[0] = entry->ent.dp_mid;
 590                         p[1] = entry->ent.dp_sid;
 591                         p[2] = entry->ent.dp_dum1;
 592                         p[3] = entry->ent.dp_dum2;
 593                         p[4] = entry->ent.dp_ipl_sct;
 594                         p[5] = entry->ent.dp_ipl_head;
 595                         le16enc(p + 6, entry->ent.dp_ipl_cyl);
 596                         p[8] = entry->ent.dp_ssect;
 597                         p[9] = entry->ent.dp_shd;
 598                         le16enc(p + 10, entry->ent.dp_scyl);
 599                         p[12] = entry->ent.dp_esect;
 600                         p[13] = entry->ent.dp_ehd;
 601                         le16enc(p + 14, entry->ent.dp_ecyl);
 602                         bcopy(entry->ent.dp_name, p + 16,
 603                             sizeof(entry->ent.dp_name));
 604                 } else
 605                         bzero(p, PC98_PARTSIZE);
 606
 607                 if (entry != NULL)
 608                         baseentry = LIST_NEXT(baseentry, gpe_entry);
 609         }
 610
 611         error = g_write_data(cp, 0, table->boot, SECSIZE);
 612         if (!error)
 613                 error = g_write_data(cp, SECSIZE, table->table, SECSIZE);
 614         if (!error)
 615                 error = g_write_data(cp, SECSIZE*2, table->menu, MENUSIZE);
 616         return (error);
 617 }