arch/all-pc/boot/grub2-aros/grub-core/commands/gptsync.c

   1 /* gptsync.c - fill the mbr based on gpt entries  */
   2 /* XXX: I don't know what to do if sector size isn't 512 bytes */
   3 /*
   4  *  GRUB  --  GRand Unified Bootloader
   5  *  Copyright (C) 2009  Free Software Foundation, Inc.
   6  *
   7  *  GRUB is free software: you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation, either version 3 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  GRUB is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <grub/command.h>
  22 #include <grub/dl.h>
  23 #include <grub/device.h>
  24 #include <grub/disk.h>
  25 #include <grub/msdos_partition.h>
  26 #include <grub/partition.h>
  27 #include <grub/misc.h>
  28 #include <grub/mm.h>
  29 #include <grub/fs.h>
  30 #include <grub/i18n.h>
  31
  32 GRUB_MOD_LICENSE ("GPLv3+");
  33
  34 /* Convert a LBA address to a CHS address in the INT 13 format.  */
  35 /* Taken from grub1. */
  36 /* XXX: use hardcoded geometry of C = 1024, H = 255, S = 63.
  37    Is it a problem?
  38 */
  39 static void
  40 lba_to_chs (grub_uint32_t lba, grub_uint8_t *cl, grub_uint8_t *ch,
  41             grub_uint8_t *dh)
  42 {
  43   grub_uint32_t cylinder, head, sector;
  44   grub_uint32_t sectors = 63, heads = 255, cylinders = 1024;
  45
  46   sector = lba % sectors + 1;
  47   head = (lba / sectors) % heads;
  48   cylinder = lba / (sectors * heads);
  49
  50   if (cylinder >= cylinders)
  51     {
  52       *cl = *ch = *dh = 0xff;
  53       return;
  54     }
  55
  56   *cl = sector | ((cylinder & 0x300) >> 2);
  57   *ch = cylinder & 0xFF;
  58   *dh = head;
  59 }
  60
  61 static grub_err_t
  62 grub_cmd_gptsync (grub_command_t cmd __attribute__ ((unused)),
  63                   int argc, char **args)
  64 {
  65   grub_device_t dev;
  66   struct grub_msdos_partition_mbr mbr;
  67   struct grub_partition *partition;
  68   grub_disk_addr_t first_sector;
  69   int numactive = 0;
  70   int i;
  71
  72   if (argc < 1)
  73     return grub_error (GRUB_ERR_BAD_ARGUMENT, "device name required");
  74   if (argc > 4)
  75     return grub_error (GRUB_ERR_BAD_ARGUMENT, "only 3 partitions can be "
  76                        "in hybrid MBR");
  77
  78   if (args[0][0] == '(' && args[0][grub_strlen (args[0]) - 1] == ')')
  79     {
  80       args[0][grub_strlen (args[0]) - 1] = 0;
  81       dev = grub_device_open (args[0] + 1);
  82       args[0][grub_strlen (args[0])] = ')';
  83     }
  84   else
  85     dev = grub_device_open (args[0]);
  86
  87   if (! dev)
  88     return grub_errno;
  89
  90   if (! dev->disk)
  91     {
  92       grub_device_close (dev);
  93       return grub_error (GRUB_ERR_BAD_ARGUMENT, "not a disk");
  94     }
  95
  96   /* Read the protective MBR.  */
  97   if (grub_disk_read (dev->disk, 0, 0, sizeof (mbr), &mbr))
  98     {
  99       grub_device_close (dev);
 100       return grub_errno;
 101     }
 102
 103   /* Check if it is valid.  */
 104   if (mbr.signature != grub_cpu_to_le16_compile_time (GRUB_PC_PARTITION_SIGNATURE))
 105     {
 106       grub_device_close (dev);
 107       return grub_error (GRUB_ERR_BAD_PART_TABLE, "no signature");
 108     }
 109
 110   /* Make sure the MBR is a protective MBR and not a normal MBR.  */
 111   for (i = 0; i < 4; i++)
 112     if (mbr.entries[i].type == GRUB_PC_PARTITION_TYPE_GPT_DISK)
 113       break;
 114   if (i == 4)
 115     {
 116       grub_device_close (dev);
 117       return grub_error (GRUB_ERR_BAD_PART_TABLE, "no GPT partition map found");
 118     }
 119
 120   first_sector = dev->disk->total_sectors;
 121   for (i = 1; i < argc; i++)
 122     {
 123       char *separator, csep = 0;
 124       grub_uint8_t type;
 125       separator = grub_strchr (args[i], '+');
 126       if (! separator)
 127         separator = grub_strchr (args[i], '-');
 128       if (separator)
 129         {
 130           csep = *separator;
 131           *separator = 0;
 132         }
 133       partition = grub_partition_probe (dev->disk, args[i]);
 134       if (separator)
 135         *separator = csep;
 136       if (! partition)
 137         {
 138           grub_device_close (dev);
 139           return grub_error (GRUB_ERR_UNKNOWN_DEVICE,
 140                              N_("no such partition"));
 141         }
 142
 143       if (partition->start + partition->len > 0xffffffff)
 144         {
 145           grub_device_close (dev);
 146           return grub_error (GRUB_ERR_OUT_OF_RANGE,
 147                              "only partitions residing in the first 2TB "
 148                              "can be present in hybrid MBR");
 149         }
 150
 151
 152       if (first_sector > partition->start)
 153         first_sector = partition->start;
 154
 155       if (separator && *(separator + 1))
 156         type = grub_strtoul (separator + 1, 0, 0);
 157       else
 158         {
 159           grub_fs_t fs = 0;
 160           dev->disk->partition = partition;
 161           fs = grub_fs_probe (dev);
 162
 163           /* Unknown filesystem isn't fatal. */
 164           if (grub_errno == GRUB_ERR_UNKNOWN_FS)
 165             {
 166               fs = 0;
 167               grub_errno = GRUB_ERR_NONE;
 168             }
 169
 170           if (fs && grub_strcmp (fs->name, "ntfs") == 0)
 171             type = GRUB_PC_PARTITION_TYPE_NTFS;
 172           else if (fs && grub_strcmp (fs->name, "fat") == 0)
 173             /* FIXME: detect FAT16. */
 174             type = GRUB_PC_PARTITION_TYPE_FAT32_LBA;
 175           else if (fs && (grub_strcmp (fs->name, "hfsplus") == 0
 176                           || grub_strcmp (fs->name, "hfs") == 0))
 177             type = GRUB_PC_PARTITION_TYPE_HFS;
 178           else
 179             /* FIXME: detect more types. */
 180             type = GRUB_PC_PARTITION_TYPE_EXT2FS;
 181
 182           dev->disk->partition = 0;
 183         }
 184
 185       mbr.entries[i].flag = (csep == '+') ? 0x80 : 0;
 186       if (csep == '+')
 187         {
 188           numactive++;
 189           if (numactive == 2)
 190             {
 191               grub_device_close (dev);
 192               return grub_error (GRUB_ERR_BAD_ARGUMENT,
 193                                  "only one partition can be active");
 194             }
 195         }
 196       mbr.entries[i].type = type;
 197       mbr.entries[i].start = grub_cpu_to_le32 (partition->start);
 198       lba_to_chs (partition->start,
 199                   &(mbr.entries[i].start_sector),
 200                   &(mbr.entries[i].start_cylinder),
 201                   &(mbr.entries[i].start_head));
 202       lba_to_chs (partition->start + partition->len - 1,
 203                   &(mbr.entries[i].end_sector),
 204                   &(mbr.entries[i].end_cylinder),
 205                   &(mbr.entries[i].end_head));
 206       mbr.entries[i].length = grub_cpu_to_le32 (partition->len);
 207       grub_free (partition);
 208     }
 209   for (; i < 4; i++)
 210     grub_memset (&(mbr.entries[i]), 0, sizeof (mbr.entries[i]));
 211
 212   /* The protective partition. */
 213   if (first_sector > 0xffffffff)
 214     first_sector = 0xffffffff;
 215   else
 216     first_sector--;
 217   mbr.entries[0].flag = 0;
 218   mbr.entries[0].type = GRUB_PC_PARTITION_TYPE_GPT_DISK;
 219   mbr.entries[0].start = grub_cpu_to_le32_compile_time (1);
 220   lba_to_chs (1,
 221               &(mbr.entries[0].start_sector),
 222               &(mbr.entries[0].start_cylinder),
 223               &(mbr.entries[0].start_head));
 224   lba_to_chs (first_sector,
 225               &(mbr.entries[0].end_sector),
 226               &(mbr.entries[0].end_cylinder),
 227               &(mbr.entries[0].end_head));
 228   mbr.entries[0].length = grub_cpu_to_le32 (first_sector);
 229
 230   mbr.signature = grub_cpu_to_le16_compile_time (GRUB_PC_PARTITION_SIGNATURE);
 231
 232   if (grub_disk_write (dev->disk, 0, 0, sizeof (mbr), &mbr))
 233     {
 234       grub_device_close (dev);
 235       return grub_errno;
 236     }
 237
 238   grub_device_close (dev);
 239
 240   grub_printf_ (N_("New MBR is written to `%s'\n"), args[0]);
 241
 242   return GRUB_ERR_NONE;
 243 }
 244
 245
 246 static grub_command_t cmd;
 247 \f
 248 GRUB_MOD_INIT(gptsync)
 249 {
 250   (void) mod;                   /* To stop warning. */
 251   cmd = grub_register_command ("gptsync", grub_cmd_gptsync,
 252                                N_("DEVICE [PARTITION[+/-[TYPE]]] ..."),
 253                                /* TRANSLATORS: MBR type is one-byte partition
 254                                   type id.  */
 255                                N_("Fill hybrid MBR of GPT drive DEVICE. "
 256                                "Specified partitions will be a part "
 257                                "of hybrid MBR. Up to 3 partitions are "
 258                                "allowed. TYPE is an MBR type. "
 259                                "+ means that partition is active. "
 260                                "Only one partition can be active."));
 261 }
 262
 263 GRUB_MOD_FINI(gptsync)
 264 {
 265   grub_unregister_command (cmd);
 266 }