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