efiblock.c revision 1.9
1 /* $NetBSD: efiblock.c,v 1.9 2020/10/18 18:05:48 tnn Exp $ */ 2 3 /*- 4 * Copyright (c) 2016 Kimihiro Nonaka <nonaka (at) netbsd.org> 5 * Copyright (c) 2018 Jared McNeill <jmcneill (at) invisible.ca> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 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 the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #define FSTYPENAMES 31 32 #include <sys/param.h> 33 #include <sys/md5.h> 34 #include <sys/uuid.h> 35 36 #include <fs/cd9660/iso.h> 37 38 #include "efiboot.h" 39 #include "efiblock.h" 40 41 static EFI_HANDLE *efi_block; 42 static UINTN efi_nblock; 43 static struct efi_block_part *efi_block_booted = NULL; 44 45 static TAILQ_HEAD(, efi_block_dev) efi_block_devs = TAILQ_HEAD_INITIALIZER(efi_block_devs); 46 47 static int 48 efi_block_parse(const char *fname, struct efi_block_part **pbpart, char **pfile) 49 { 50 struct efi_block_dev *bdev; 51 struct efi_block_part *bpart; 52 char pathbuf[PATH_MAX], *default_device, *ep = NULL; 53 const char *full_path; 54 intmax_t dev; 55 int part; 56 57 default_device = get_default_device(); 58 if (strchr(fname, ':') == NULL) { 59 if (strlen(default_device) > 0) { 60 snprintf(pathbuf, sizeof(pathbuf), "%s:%s", default_device, fname); 61 full_path = pathbuf; 62 *pfile = __UNCONST(fname); 63 } else { 64 return EINVAL; 65 } 66 } else { 67 full_path = fname; 68 *pfile = strchr(fname, ':') + 1; 69 } 70 71 if (strncasecmp(full_path, "hd", 2) != 0) 72 return EINVAL; 73 dev = strtoimax(full_path + 2, &ep, 10); 74 if (dev < 0 || dev >= efi_nblock) 75 return ENXIO; 76 if (ep[0] < 'a' || ep[0] >= 'a' + MAXPARTITIONS || ep[1] != ':') 77 return EINVAL; 78 part = ep[0] - 'a'; 79 TAILQ_FOREACH(bdev, &efi_block_devs, entries) { 80 if (bdev->index == dev) { 81 TAILQ_FOREACH(bpart, &bdev->partitions, entries) { 82 if (bpart->index == part) { 83 *pbpart = bpart; 84 return 0; 85 } 86 } 87 } 88 } 89 90 return ENOENT; 91 } 92 93 static void 94 efi_block_generate_hash_mbr(struct efi_block_part *bpart, struct mbr_sector *mbr) 95 { 96 MD5_CTX md5ctx; 97 98 MD5Init(&md5ctx); 99 MD5Update(&md5ctx, (void *)mbr, sizeof(*mbr)); 100 MD5Final(bpart->hash, &md5ctx); 101 } 102 103 static void * 104 efi_block_allocate_device_buffer(struct efi_block_dev *bdev, UINTN size, 105 void **buf_start) 106 { 107 void *buf; 108 109 if (bdev->bio->Media->IoAlign <= 1) 110 *buf_start = buf = AllocatePool(size); 111 else { 112 buf = AllocatePool(size + bdev->bio->Media->IoAlign - 1); 113 *buf_start = (buf == NULL) ? NULL : 114 (void *)roundup2((intptr_t)buf, bdev->bio->Media->IoAlign); 115 } 116 117 return buf; 118 } 119 120 static int 121 efi_block_find_partitions_cd9660(struct efi_block_dev *bdev) 122 { 123 struct efi_block_part *bpart; 124 struct iso_primary_descriptor *vd; 125 void *buf, *buf_start; 126 EFI_STATUS status; 127 EFI_LBA lba; 128 UINT32 sz; 129 130 sz = __MAX(sizeof(*vd), bdev->bio->Media->BlockSize); 131 sz = roundup(sz, bdev->bio->Media->BlockSize); 132 if ((buf = efi_block_allocate_device_buffer(bdev, sz, &buf_start)) == NULL) 133 return ENOMEM; 134 135 for (lba = 16;; lba++) { 136 status = uefi_call_wrapper(bdev->bio->ReadBlocks, 5, bdev->bio, bdev->media_id, 137 lba, sz, buf_start); 138 if (EFI_ERROR(status)) 139 goto io_error; 140 141 vd = (struct iso_primary_descriptor *)buf_start; 142 if (memcmp(vd->id, ISO_STANDARD_ID, sizeof vd->id) != 0) 143 goto io_error; 144 if (isonum_711(vd->type) == ISO_VD_END) 145 goto io_error; 146 if (isonum_711(vd->type) == ISO_VD_PRIMARY) 147 break; 148 } 149 150 if (isonum_723(vd->logical_block_size) != ISO_DEFAULT_BLOCK_SIZE) 151 goto io_error; 152 153 bpart = alloc(sizeof(*bpart)); 154 bpart->index = 0; 155 bpart->bdev = bdev; 156 bpart->type = EFI_BLOCK_PART_CD9660; 157 TAILQ_INSERT_TAIL(&bdev->partitions, bpart, entries); 158 159 FreePool(buf); 160 return 0; 161 162 io_error: 163 FreePool(buf); 164 return EIO; 165 } 166 167 static int 168 efi_block_find_partitions_disklabel(struct efi_block_dev *bdev, struct mbr_sector *mbr, uint32_t start, uint32_t size) 169 { 170 struct efi_block_part *bpart; 171 struct disklabel d; 172 struct partition *p; 173 EFI_STATUS status; 174 EFI_LBA lba; 175 void *buf, *buf_start; 176 UINT32 sz; 177 int n; 178 179 sz = __MAX(sizeof(d), bdev->bio->Media->BlockSize); 180 sz = roundup(sz, bdev->bio->Media->BlockSize); 181 if ((buf = efi_block_allocate_device_buffer(bdev, sz, &buf_start)) == NULL) 182 return ENOMEM; 183 184 lba = (((EFI_LBA)start + LABELSECTOR) * DEV_BSIZE) / bdev->bio->Media->BlockSize; 185 status = uefi_call_wrapper(bdev->bio->ReadBlocks, 5, bdev->bio, bdev->media_id, 186 lba, sz, buf_start); 187 if (EFI_ERROR(status) || getdisklabel(buf_start, &d) != NULL) { 188 FreePool(buf); 189 return EIO; 190 } 191 FreePool(buf); 192 193 if (le32toh(d.d_magic) != DISKMAGIC || le32toh(d.d_magic2) != DISKMAGIC) 194 return EINVAL; 195 if (le16toh(d.d_npartitions) > MAXPARTITIONS) 196 return EINVAL; 197 198 for (n = 0; n < le16toh(d.d_npartitions); n++) { 199 p = &d.d_partitions[n]; 200 switch (p->p_fstype) { 201 case FS_BSDFFS: 202 case FS_MSDOS: 203 case FS_BSDLFS: 204 break; 205 default: 206 continue; 207 } 208 209 bpart = alloc(sizeof(*bpart)); 210 bpart->index = n; 211 bpart->bdev = bdev; 212 bpart->type = EFI_BLOCK_PART_DISKLABEL; 213 bpart->disklabel.secsize = le32toh(d.d_secsize); 214 bpart->disklabel.part = *p; 215 efi_block_generate_hash_mbr(bpart, mbr); 216 TAILQ_INSERT_TAIL(&bdev->partitions, bpart, entries); 217 } 218 219 return 0; 220 } 221 222 static int 223 efi_block_find_partitions_mbr(struct efi_block_dev *bdev) 224 { 225 struct mbr_sector mbr; 226 struct mbr_partition *mbr_part; 227 EFI_STATUS status; 228 void *buf, *buf_start; 229 UINT32 sz; 230 int n; 231 232 sz = __MAX(sizeof(mbr), bdev->bio->Media->BlockSize); 233 sz = roundup(sz, bdev->bio->Media->BlockSize); 234 if ((buf = efi_block_allocate_device_buffer(bdev, sz, &buf_start)) == NULL) 235 return ENOMEM; 236 237 status = uefi_call_wrapper(bdev->bio->ReadBlocks, 5, bdev->bio, bdev->media_id, 238 0, sz, buf_start); 239 if (EFI_ERROR(status)) { 240 FreePool(buf); 241 return EIO; 242 } 243 memcpy(&mbr, buf_start, sizeof(mbr)); 244 FreePool(buf); 245 246 if (le32toh(mbr.mbr_magic) != MBR_MAGIC) 247 return ENOENT; 248 249 for (n = 0; n < MBR_PART_COUNT; n++) { 250 mbr_part = &mbr.mbr_parts[n]; 251 if (le32toh(mbr_part->mbrp_size) == 0) 252 continue; 253 if (mbr_part->mbrp_type == MBR_PTYPE_NETBSD) { 254 efi_block_find_partitions_disklabel(bdev, &mbr, le32toh(mbr_part->mbrp_start), le32toh(mbr_part->mbrp_size)); 255 break; 256 } 257 } 258 259 return 0; 260 } 261 262 static const struct { 263 struct uuid guid; 264 uint8_t fstype; 265 } gpt_guid_to_str[] = { 266 { GPT_ENT_TYPE_NETBSD_FFS, FS_BSDFFS }, 267 { GPT_ENT_TYPE_NETBSD_LFS, FS_BSDLFS }, 268 { GPT_ENT_TYPE_NETBSD_RAIDFRAME, FS_RAID }, 269 { GPT_ENT_TYPE_NETBSD_CCD, FS_CCD }, 270 { GPT_ENT_TYPE_NETBSD_CGD, FS_CGD }, 271 { GPT_ENT_TYPE_MS_BASIC_DATA, FS_MSDOS }, /* or NTFS? ambiguous */ 272 { GPT_ENT_TYPE_EFI, FS_MSDOS }, 273 }; 274 275 static int 276 efi_block_find_partitions_gpt_entry(struct efi_block_dev *bdev, struct gpt_hdr *hdr, struct gpt_ent *ent, UINT32 index) 277 { 278 struct efi_block_part *bpart; 279 uint8_t fstype = FS_UNUSED; 280 struct uuid uuid; 281 int n; 282 283 memcpy(&uuid, ent->ent_type, sizeof(uuid)); 284 for (n = 0; n < __arraycount(gpt_guid_to_str); n++) 285 if (memcmp(ent->ent_type, &gpt_guid_to_str[n].guid, sizeof(ent->ent_type)) == 0) { 286 fstype = gpt_guid_to_str[n].fstype; 287 break; 288 } 289 if (fstype == FS_UNUSED) 290 return 0; 291 292 bpart = alloc(sizeof(*bpart)); 293 bpart->index = index; 294 bpart->bdev = bdev; 295 bpart->type = EFI_BLOCK_PART_GPT; 296 bpart->gpt.fstype = fstype; 297 bpart->gpt.ent = *ent; 298 memcpy(bpart->hash, ent->ent_guid, sizeof(bpart->hash)); 299 TAILQ_INSERT_TAIL(&bdev->partitions, bpart, entries); 300 301 return 0; 302 } 303 304 static int 305 efi_block_find_partitions_gpt(struct efi_block_dev *bdev) 306 { 307 struct gpt_hdr hdr; 308 struct gpt_ent ent; 309 EFI_STATUS status; 310 void *buf, *buf_start; 311 UINT32 sz, entry; 312 313 sz = __MAX(sizeof(hdr), bdev->bio->Media->BlockSize); 314 sz = roundup(sz, bdev->bio->Media->BlockSize); 315 if ((buf = efi_block_allocate_device_buffer(bdev, sz, &buf_start)) == NULL) 316 return ENOMEM; 317 318 status = uefi_call_wrapper(bdev->bio->ReadBlocks, 5, bdev->bio, bdev->media_id, 319 GPT_HDR_BLKNO, sz, buf_start); 320 if (EFI_ERROR(status)) { 321 FreePool(buf); 322 return EIO; 323 } 324 memcpy(&hdr, buf_start, sizeof(hdr)); 325 FreePool(buf); 326 327 if (memcmp(hdr.hdr_sig, GPT_HDR_SIG, sizeof(hdr.hdr_sig)) != 0) 328 return ENOENT; 329 if (le32toh(hdr.hdr_entsz) < sizeof(ent)) 330 return EINVAL; 331 332 sz = __MAX(le32toh(hdr.hdr_entsz) * le32toh(hdr.hdr_entries), bdev->bio->Media->BlockSize); 333 sz = roundup(sz, bdev->bio->Media->BlockSize); 334 if ((buf = efi_block_allocate_device_buffer(bdev, sz, &buf_start)) == NULL) 335 return ENOMEM; 336 337 status = uefi_call_wrapper(bdev->bio->ReadBlocks, 5, bdev->bio, bdev->media_id, 338 le64toh(hdr.hdr_lba_table), sz, buf_start); 339 if (EFI_ERROR(status)) { 340 FreePool(buf); 341 return EIO; 342 } 343 344 for (entry = 0; entry < le32toh(hdr.hdr_entries); entry++) { 345 memcpy(&ent, buf_start + (entry * le32toh(hdr.hdr_entsz)), 346 sizeof(ent)); 347 efi_block_find_partitions_gpt_entry(bdev, &hdr, &ent, entry); 348 } 349 350 FreePool(buf); 351 352 return 0; 353 } 354 355 static int 356 efi_block_find_partitions(struct efi_block_dev *bdev) 357 { 358 int error; 359 360 error = efi_block_find_partitions_gpt(bdev); 361 if (error) 362 error = efi_block_find_partitions_mbr(bdev); 363 if (error) 364 error = efi_block_find_partitions_cd9660(bdev); 365 366 return error; 367 } 368 369 void 370 efi_block_probe(void) 371 { 372 struct efi_block_dev *bdev; 373 struct efi_block_part *bpart; 374 EFI_BLOCK_IO *bio; 375 EFI_STATUS status; 376 uint16_t devindex = 0; 377 int depth = -1; 378 int n; 379 380 status = LibLocateHandle(ByProtocol, &BlockIoProtocol, NULL, &efi_nblock, &efi_block); 381 if (EFI_ERROR(status)) 382 return; 383 384 if (efi_bootdp) { 385 depth = efi_device_path_depth(efi_bootdp, MEDIA_DEVICE_PATH); 386 if (depth == 0) 387 depth = 1; 388 else if (depth == -1) 389 depth = 2; 390 } 391 392 for (n = 0; n < efi_nblock; n++) { 393 status = uefi_call_wrapper(BS->HandleProtocol, 3, efi_block[n], &BlockIoProtocol, (void **)&bio); 394 if (EFI_ERROR(status) || !bio->Media->MediaPresent) 395 continue; 396 397 if (bio->Media->LogicalPartition) 398 continue; 399 400 bdev = alloc(sizeof(*bdev)); 401 bdev->index = devindex++; 402 bdev->bio = bio; 403 bdev->media_id = bio->Media->MediaId; 404 bdev->path = DevicePathFromHandle(efi_block[n]); 405 TAILQ_INIT(&bdev->partitions); 406 TAILQ_INSERT_TAIL(&efi_block_devs, bdev, entries); 407 408 efi_block_find_partitions(bdev); 409 410 if (depth > 0 && efi_device_path_ncmp(efi_bootdp, DevicePathFromHandle(efi_block[n]), depth) == 0) { 411 TAILQ_FOREACH(bpart, &bdev->partitions, entries) { 412 uint8_t fstype = FS_UNUSED; 413 switch (bpart->type) { 414 case EFI_BLOCK_PART_DISKLABEL: 415 fstype = bpart->disklabel.part.p_fstype; 416 break; 417 case EFI_BLOCK_PART_GPT: 418 fstype = bpart->gpt.fstype; 419 break; 420 case EFI_BLOCK_PART_CD9660: 421 fstype = FS_ISO9660; 422 break; 423 } 424 if (fstype == FS_BSDFFS || fstype == FS_ISO9660) { 425 char devname[9]; 426 snprintf(devname, sizeof(devname), "hd%u%c", bdev->index, bpart->index + 'a'); 427 set_default_device(devname); 428 set_default_fstype(fstype); 429 break; 430 } 431 } 432 } 433 } 434 } 435 436 static void 437 print_guid(const uint8_t *guid) 438 { 439 const int index[] = { 3, 2, 1, 0, 5, 4, 7, 6, 8, 9, 10, 11, 12, 13, 14, 15 }; 440 int i; 441 442 for (i = 0; i < 16; i++) { 443 printf("%02x", guid[index[i]]); 444 if (i == 3 || i == 5 || i == 7 || i == 9) 445 printf("-"); 446 } 447 } 448 449 void 450 efi_block_show(void) 451 { 452 struct efi_block_dev *bdev; 453 struct efi_block_part *bpart; 454 uint64_t size; 455 CHAR16 *path; 456 457 TAILQ_FOREACH(bdev, &efi_block_devs, entries) { 458 printf("hd%u (", bdev->index); 459 460 /* Size in MB */ 461 size = ((bdev->bio->Media->LastBlock + 1) * bdev->bio->Media->BlockSize) / (1024 * 1024); 462 if (size >= 10000) 463 printf("%"PRIu64" GB", size / 1024); 464 else 465 printf("%"PRIu64" MB", size); 466 printf("): "); 467 468 path = DevicePathToStr(bdev->path); 469 Print(L"%s", path); 470 FreePool(path); 471 472 printf("\n"); 473 474 TAILQ_FOREACH(bpart, &bdev->partitions, entries) { 475 switch (bpart->type) { 476 case EFI_BLOCK_PART_DISKLABEL: 477 printf(" hd%u%c (", bdev->index, bpart->index + 'a'); 478 479 /* Size in MB */ 480 size = ((uint64_t)bpart->disklabel.secsize * bpart->disklabel.part.p_size) / (1024 * 1024); 481 if (size >= 10000) 482 printf("%"PRIu64" GB", size / 1024); 483 else 484 printf("%"PRIu64" MB", size); 485 printf("): "); 486 487 printf("%s\n", fstypenames[bpart->disklabel.part.p_fstype]); 488 break; 489 case EFI_BLOCK_PART_GPT: 490 printf(" hd%u%c ", bdev->index, bpart->index + 'a'); 491 492 if (bpart->gpt.ent.ent_name[0] == 0x0000) { 493 printf("\""); 494 print_guid(bpart->gpt.ent.ent_guid); 495 printf("\""); 496 } else { 497 Print(L"\"%s\"", bpart->gpt.ent.ent_name); 498 } 499 500 /* Size in MB */ 501 size = (le64toh(bpart->gpt.ent.ent_lba_end) - le64toh(bpart->gpt.ent.ent_lba_start)) * bdev->bio->Media->BlockSize; 502 size /= (1024 * 1024); 503 if (size >= 10000) 504 printf(" (%"PRIu64" GB): ", size / 1024); 505 else 506 printf(" (%"PRIu64" MB): ", size); 507 508 printf("%s\n", fstypenames[bpart->gpt.fstype]); 509 break; 510 case EFI_BLOCK_PART_CD9660: 511 printf(" hd%u%c %s\n", bdev->index, bpart->index + 'a', fstypenames[FS_ISO9660]); 512 break; 513 default: 514 break; 515 } 516 } 517 } 518 } 519 520 struct efi_block_part * 521 efi_block_boot_part(void) 522 { 523 return efi_block_booted; 524 } 525 526 int 527 efi_block_open(struct open_file *f, ...) 528 { 529 struct efi_block_part *bpart; 530 const char *fname; 531 char **file; 532 char *path; 533 va_list ap; 534 int rv, n; 535 536 va_start(ap, f); 537 fname = va_arg(ap, const char *); 538 file = va_arg(ap, char **); 539 va_end(ap); 540 541 rv = efi_block_parse(fname, &bpart, &path); 542 if (rv != 0) 543 return rv; 544 545 for (n = 0; n < ndevs; n++) 546 if (strcmp(DEV_NAME(&devsw[n]), "efiblock") == 0) { 547 f->f_dev = &devsw[n]; 548 break; 549 } 550 if (n == ndevs) 551 return ENXIO; 552 553 f->f_devdata = bpart; 554 555 *file = path; 556 557 efi_block_booted = bpart; 558 559 return 0; 560 } 561 562 int 563 efi_block_close(struct open_file *f) 564 { 565 return 0; 566 } 567 568 int 569 efi_block_strategy(void *devdata, int rw, daddr_t dblk, size_t size, void *buf, size_t *rsize) 570 { 571 struct efi_block_part *bpart = devdata; 572 EFI_STATUS status; 573 void *allocated_buf, *aligned_buf; 574 575 if (rw != F_READ) 576 return EROFS; 577 578 switch (bpart->type) { 579 case EFI_BLOCK_PART_DISKLABEL: 580 if (bpart->bdev->bio->Media->BlockSize != bpart->disklabel.secsize) { 581 printf("%s: unsupported block size %d (expected %d)\n", __func__, 582 bpart->bdev->bio->Media->BlockSize, bpart->disklabel.secsize); 583 return EIO; 584 } 585 dblk += bpart->disklabel.part.p_offset; 586 break; 587 case EFI_BLOCK_PART_GPT: 588 if (bpart->bdev->bio->Media->BlockSize != DEV_BSIZE) { 589 printf("%s: unsupported block size %d (expected %d)\n", __func__, 590 bpart->bdev->bio->Media->BlockSize, DEV_BSIZE); 591 return EIO; 592 } 593 dblk += le64toh(bpart->gpt.ent.ent_lba_start); 594 break; 595 case EFI_BLOCK_PART_CD9660: 596 break; 597 default: 598 return EINVAL; 599 } 600 601 if ((bpart->bdev->bio->Media->IoAlign <= 1) || 602 ((intptr_t)buf & (bpart->bdev->bio->Media->IoAlign - 1)) == 0) { 603 allocated_buf = NULL; 604 aligned_buf = buf; 605 } else if ((allocated_buf = efi_block_allocate_device_buffer(bpart->bdev, 606 size, &aligned_buf)) == NULL) 607 return ENOMEM; 608 609 status = uefi_call_wrapper(bpart->bdev->bio->ReadBlocks, 5, 610 bpart->bdev->bio, bpart->bdev->media_id, dblk, size, aligned_buf); 611 if (EFI_ERROR(status)) { 612 if (allocated_buf != NULL) 613 FreePool(allocated_buf); 614 return EIO; 615 } 616 if (allocated_buf != NULL) { 617 memcpy(buf, aligned_buf, size); 618 FreePool(allocated_buf); 619 } 620 621 *rsize = size; 622 623 return 0; 624 } 625
Indexes created Tue Sep 30 17:09:57 GMT 2025