sbin/gpt/boot.c

   1 /*
   2  * Copyright (c) 2008 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/types.h>
  36
  37 #include <err.h>
  38 #include <stddef.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <unistd.h>
  43 #include <fcntl.h>
  44
  45 #include "map.h"
  46 #include "gpt.h"
  47
  48 static void
  49 usage_boot(void)
  50 {
  51         fprintf(stderr, "usage: %s device\n", getprogname());
  52         exit(1);
  53 }
  54
  55 static void
  56 bootset(int fd)
  57 {
  58         uuid_t uuid;
  59         off_t  block;
  60         off_t  size;
  61         unsigned int entry;
  62         map_t *gpt, *tpg;
  63         map_t *tbl, *lbt;
  64         map_t *map;
  65         u_int32_t status;
  66         struct gpt_hdr *hdr;
  67         struct gpt_ent *ent;
  68         struct mbr *mbr;
  69         int bfd;
  70
  71         /*
  72          * Paramters for boot partition
  73          */
  74         uuid_name_lookup(&uuid, "DragonFly Label32", &status);
  75         if (status != uuid_s_ok)
  76                 err(1, "unable to find uuid for 'DragonFly Label32'");
  77         entry = 0;
  78         block = 0;
  79         size = (off_t)1024 * 1024 * 1024 / 512;         /* 1GB */
  80
  81         gpt = map_find(MAP_TYPE_PRI_GPT_HDR);
  82         if (gpt == NULL)
  83                 errx(1, "%s: error: no primary GPT header", device_name);
  84         tpg = map_find(MAP_TYPE_SEC_GPT_HDR);
  85         if (tpg == NULL)
  86                 errx(1, "%s: error: no secondary GPT header", device_name);
  87         tbl = map_find(MAP_TYPE_PRI_GPT_TBL);
  88         lbt = map_find(MAP_TYPE_SEC_GPT_TBL);
  89         if (tbl == NULL || lbt == NULL) {
  90                 errx(1, "%s: error: no primary or secondary gpt table",
  91                      device_name);
  92         }
  93
  94         hdr = gpt->map_data;
  95         if (entry > le32toh(hdr->hdr_entries)) {
  96                 errx(1, "%s: error: index %u out of range (%u max)",
  97                      device_name, entry, le32toh(hdr->hdr_entries));
  98         }
  99
 100         ent = (void *)((char *)tbl->map_data + entry *
 101                        le32toh(hdr->hdr_entsz));
 102         if (!uuid_is_nil(&ent->ent_type, NULL)) {
 103                 errx(1, "%s: error: entry at index %d is not free",
 104                      device_name, entry);
 105         }
 106         map = map_alloc(block, size);
 107         if (map == NULL)
 108                 errx(1, "%s: error: no space available on device", device_name);
 109         block = map->map_start;
 110         size  = map->map_size;
 111
 112         le_uuid_enc(&ent->ent_type, &uuid);
 113         ent->ent_lba_start = htole64(map->map_start);
 114         ent->ent_lba_end = htole64(map->map_start + map->map_size - 1LL);
 115
 116         hdr->hdr_crc_table = htole32(crc32(tbl->map_data,
 117                                      le32toh(hdr->hdr_entries) *
 118                                      le32toh(hdr->hdr_entsz)));
 119         hdr->hdr_crc_self = 0;
 120         hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size)));
 121
 122         gpt_write(fd, gpt);
 123         gpt_write(fd, tbl);
 124
 125         hdr = tpg->map_data;
 126         ent = (void*)((char*)lbt->map_data + entry * le32toh(hdr->hdr_entsz));
 127         le_uuid_enc(&ent->ent_type, &uuid);
 128         ent->ent_lba_start = htole64(map->map_start);
 129         ent->ent_lba_end = htole64(map->map_start + map->map_size - 1LL);
 130
 131         hdr->hdr_crc_table = htole32(crc32(lbt->map_data,
 132                                      le32toh(hdr->hdr_entries) *
 133                                      le32toh(hdr->hdr_entsz)));
 134         hdr->hdr_crc_self = 0;
 135         hdr->hdr_crc_self = htole32(crc32(hdr, le32toh(hdr->hdr_size)));
 136
 137         gpt_write(fd, lbt);
 138         gpt_write(fd, tpg);
 139
 140         /*
 141          * Create a dummy partition
 142          */
 143         map = map_find(MAP_TYPE_PMBR);
 144         if (map == NULL)
 145                 errx(1, "I can't find the PMBR!");
 146         mbr = map->map_data;
 147         if (mbr == NULL)
 148                 errx(1, "I can't find the PMBR's data!");
 149
 150         /*
 151          * Copy in real boot code
 152          */
 153         bfd = open("/boot/boot0", O_RDONLY);
 154         if (bfd < 0 ||
 155             read(bfd, mbr->mbr_code, sizeof(mbr->mbr_code)) !=
 156             sizeof(mbr->mbr_code)) {
 157                 errx(1, "Cannot read /boot/boot0");
 158         }
 159         close(bfd);
 160
 161         /*
 162          * Generate partition #1
 163          */
 164         mbr->mbr_part[1].part_shd = 0xff;
 165         mbr->mbr_part[1].part_ssect = 0xff;
 166         mbr->mbr_part[1].part_scyl = 0xff;
 167         mbr->mbr_part[1].part_ehd = 0xff;
 168         mbr->mbr_part[1].part_esect = 0xff;
 169         mbr->mbr_part[1].part_ecyl = 0xff;
 170         mbr->mbr_part[1].part_start_lo = htole16(block);
 171         mbr->mbr_part[1].part_start_hi = htole16((block) >> 16);
 172         mbr->mbr_part[1].part_size_lo = htole16(size);
 173         mbr->mbr_part[1].part_size_hi = htole16(size >> 16);
 174
 175         mbr->mbr_part[1].part_typ = 108;
 176         mbr->mbr_part[1].part_flag = 0x80;
 177
 178         gpt_write(fd, map);
 179 }
 180
 181 int
 182 cmd_boot(int argc, char *argv[])
 183 {
 184         int ch, fd;
 185
 186         while ((ch = getopt(argc, argv, "")) != -1) {
 187                 switch(ch) {
 188                 default:
 189                         usage_boot();
 190                 }
 191         }
 192
 193         if (argc == optind)
 194                 usage_boot();
 195
 196         while (optind < argc) {
 197                 fd = gpt_open(argv[optind++]);
 198                 if (fd == -1) {
 199                         warn("unable to open device '%s'", device_name);
 200                         continue;
 201                 }
 202                 bootset(fd);
 203                 gpt_close(fd);
 204         }
 205         return (0);
 206 }
 207