/* gptsync.c - fill the mbr based on gpt entries */ /* XXX: I don't know what to do if sector size isn't 512 bytes */ /* * GRUB -- GRand Unified Bootloader * Copyright (C) 2009 Free Software Foundation, Inc. * * GRUB is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * GRUB is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with GRUB. If not, see . */ #include #include #include #include #include #include #include #include #include #include GRUB_MOD_LICENSE ("GPLv3+"); /* Convert a LBA address to a CHS address in the INT 13 format. */ /* Taken from grub1. */ /* XXX: use hardcoded geometry of C = 1024, H = 255, S = 63. Is it a problem? */ static void lba_to_chs (int lba, grub_uint8_t *cl, grub_uint8_t *ch, grub_uint8_t *dh) { int cylinder, head, sector; int sectors = 63, heads = 255, cylinders = 1024; sector = lba % sectors + 1; head = (lba / sectors) % heads; cylinder = lba / (sectors * heads); if (cylinder >= cylinders) { *cl = *ch = *dh = 0xff; return; } *cl = sector | ((cylinder & 0x300) >> 2); *ch = cylinder & 0xFF; *dh = head; } static grub_err_t grub_cmd_gptsync (grub_command_t cmd __attribute__ ((unused)), int argc, char **args) { grub_device_t dev; struct grub_msdos_partition_mbr mbr; struct grub_partition *partition; grub_disk_addr_t first_sector; int numactive = 0; if (argc < 1) return grub_error (GRUB_ERR_BAD_ARGUMENT, "device name required"); if (argc > 4) return grub_error (GRUB_ERR_BAD_ARGUMENT, "only 3 partitions can be " "in hybrid MBR"); if (args[0][0] == '(' && args[0][grub_strlen (args[0]) - 1] == ')') { args[0][grub_strlen (args[0]) - 1] = 0; dev = grub_device_open (args[0] + 1); args[0][grub_strlen (args[0])] = ')'; } else dev = grub_device_open (args[0]); if (! dev) return grub_errno; if (! dev->disk) { grub_device_close (dev); return grub_error (GRUB_ERR_BAD_ARGUMENT, "not a disk"); } /* Read the protective MBR. */ if (grub_disk_read (dev->disk, 0, 0, sizeof (mbr), &mbr)) { grub_device_close (dev); return grub_errno; } /* Check if it is valid. */ if (mbr.signature != grub_cpu_to_le16 (GRUB_PC_PARTITION_SIGNATURE)) { grub_device_close (dev); return grub_error (GRUB_ERR_BAD_PART_TABLE, "no signature"); } /* Make sure the MBR is a protective MBR and not a normal MBR. */ if (mbr.entries[0].type != GRUB_PC_PARTITION_TYPE_GPT_DISK) { grub_device_close (dev); return grub_error (GRUB_ERR_BAD_PART_TABLE, "no GPT partition map found"); } int i; first_sector = dev->disk->total_sectors; for (i = 1; i < argc; i++) { char *separator, csep = 0; grub_uint8_t type; separator = grub_strchr (args[i], '+'); if (! separator) separator = grub_strchr (args[i], '-'); if (separator) { csep = *separator; *separator = 0; } partition = grub_partition_probe (dev->disk, args[i]); if (separator) *separator = csep; if (! partition) { grub_device_close (dev); return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "no such partition"); } if (partition->start + partition->len > 0xffffffff) { grub_device_close (dev); return grub_error (GRUB_ERR_OUT_OF_RANGE, "only partitions residing in the first 2TB " "can be present in hybrid MBR"); } if (first_sector > partition->start) first_sector = partition->start; if (separator && *(separator + 1)) type = grub_strtoul (separator + 1, 0, 0); else { grub_fs_t fs = 0; dev->disk->partition = partition; fs = grub_fs_probe (dev); /* Unknown filesystem isn't fatal. */ if (grub_errno == GRUB_ERR_UNKNOWN_FS) { fs = 0; grub_errno = GRUB_ERR_NONE; } if (fs && grub_strcmp (fs->name, "ntfs") == 0) type = GRUB_PC_PARTITION_TYPE_NTFS; else if (fs && grub_strcmp (fs->name, "fat") == 0) /* FIXME: detect FAT16. */ type = GRUB_PC_PARTITION_TYPE_FAT32_LBA; else if (fs && (grub_strcmp (fs->name, "hfsplus") == 0 || grub_strcmp (fs->name, "hfs") == 0)) type = GRUB_PC_PARTITION_TYPE_HFS; else /* FIXME: detect more types. */ type = GRUB_PC_PARTITION_TYPE_EXT2FS; dev->disk->partition = 0; } mbr.entries[i].flag = (csep == '+') ? 0x80 : 0; if (csep == '+') { numactive++; if (numactive == 2) { grub_device_close (dev); return grub_error (GRUB_ERR_BAD_ARGUMENT, "only one partition can be active"); } } mbr.entries[i].type = type; mbr.entries[i].start = grub_cpu_to_le32 (partition->start); lba_to_chs (partition->start, &(mbr.entries[i].start_sector), &(mbr.entries[i].start_cylinder), &(mbr.entries[i].start_head)); lba_to_chs (partition->start + partition->len - 1, &(mbr.entries[i].end_sector), &(mbr.entries[i].end_cylinder), &(mbr.entries[i].end_head)); mbr.entries[i].length = grub_cpu_to_le32 (partition->len); grub_free (partition); } for (; i < 4; i++) grub_memset (&(mbr.entries[i]), 0, sizeof (mbr.entries[i])); /* The protective partition. */ if (first_sector > 0xffffffff) first_sector = 0xffffffff; else first_sector--; mbr.entries[0].flag = 0; mbr.entries[0].type = GRUB_PC_PARTITION_TYPE_GPT_DISK; mbr.entries[0].start = grub_cpu_to_le32 (1); lba_to_chs (1, &(mbr.entries[0].start_sector), &(mbr.entries[0].start_cylinder), &(mbr.entries[0].start_head)); lba_to_chs (first_sector, &(mbr.entries[0].end_sector), &(mbr.entries[0].end_cylinder), &(mbr.entries[0].end_head)); mbr.entries[0].length = grub_cpu_to_le32 (first_sector); mbr.signature = grub_cpu_to_le16 (GRUB_PC_PARTITION_SIGNATURE); if (grub_disk_write (dev->disk, 0, 0, sizeof (mbr), &mbr)) { grub_device_close (dev); return grub_errno; } grub_printf ("New MBR is written to '%s'\n", args[0]); return GRUB_ERR_NONE; } static grub_command_t cmd; GRUB_MOD_INIT(gptsync) { (void) mod; /* To stop warning. */ cmd = grub_register_command ("gptsync", grub_cmd_gptsync, N_("DEVICE [PARTITION[+/-[TYPE]]] ..."), N_("Fill hybrid MBR of GPT drive DEVICE. " "Specified partitions will be a part " "of hybrid MBR. Up to 3 partitions are " "allowed. TYPE is an MBR type. " "+ means that partition is active. " "Only one partition can be active.")); } GRUB_MOD_FINI(gptsync) { grub_unregister_command (cmd); } ='#n55'>55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380