1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * EFI device path from u-boot device-model mapping 4 * 5 * (C) Copyright 2017 Rob Clark 6 */ 7 8 #define LOG_CATEGORY LOGL_ERR 9 10 #include <common.h> 11 #include <blk.h> 12 #include <dm.h> 13 #include <usb.h> 14 #include <mmc.h> 15 #include <efi_loader.h> 16 #include <part.h> 17 18 /* template END node: */ 19 static const struct efi_device_path END = { 20 .type = DEVICE_PATH_TYPE_END, 21 .sub_type = DEVICE_PATH_SUB_TYPE_END, 22 .length = sizeof(END), 23 }; 24 25 /* template ROOT node: */ 26 static const struct efi_device_path_vendor ROOT = { 27 .dp = { 28 .type = DEVICE_PATH_TYPE_HARDWARE_DEVICE, 29 .sub_type = DEVICE_PATH_SUB_TYPE_VENDOR, 30 .length = sizeof(ROOT), 31 }, 32 .guid = U_BOOT_GUID, 33 }; 34 35 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC) 36 /* 37 * Determine if an MMC device is an SD card. 38 * 39 * @desc block device descriptor 40 * @return true if the device is an SD card 41 */ 42 static bool is_sd(struct blk_desc *desc) 43 { 44 struct mmc *mmc = find_mmc_device(desc->devnum); 45 46 if (!mmc) 47 return false; 48 49 return IS_SD(mmc) != 0U; 50 } 51 #endif 52 53 static void *dp_alloc(size_t sz) 54 { 55 void *buf; 56 57 if (efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, sz, &buf) != 58 EFI_SUCCESS) { 59 debug("EFI: ERROR: out of memory in %s\n", __func__); 60 return NULL; 61 } 62 63 memset(buf, 0, sz); 64 return buf; 65 } 66 67 /* 68 * Iterate to next block in device-path, terminating (returning NULL) 69 * at /End* node. 70 */ 71 struct efi_device_path *efi_dp_next(const struct efi_device_path *dp) 72 { 73 if (dp == NULL) 74 return NULL; 75 if (dp->type == DEVICE_PATH_TYPE_END) 76 return NULL; 77 dp = ((void *)dp) + dp->length; 78 if (dp->type == DEVICE_PATH_TYPE_END) 79 return NULL; 80 return (struct efi_device_path *)dp; 81 } 82 83 /* 84 * Compare two device-paths, stopping when the shorter of the two hits 85 * an End* node. This is useful to, for example, compare a device-path 86 * representing a device with one representing a file on the device, or 87 * a device with a parent device. 88 */ 89 int efi_dp_match(const struct efi_device_path *a, 90 const struct efi_device_path *b) 91 { 92 while (1) { 93 int ret; 94 95 ret = memcmp(&a->length, &b->length, sizeof(a->length)); 96 if (ret) 97 return ret; 98 99 ret = memcmp(a, b, a->length); 100 if (ret) 101 return ret; 102 103 a = efi_dp_next(a); 104 b = efi_dp_next(b); 105 106 if (!a || !b) 107 return 0; 108 } 109 } 110 111 /* 112 * See UEFI spec (section 3.1.2, about short-form device-paths.. 113 * tl;dr: we can have a device-path that starts with a USB WWID 114 * or USB Class node, and a few other cases which don't encode 115 * the full device path with bus hierarchy: 116 * 117 * - MESSAGING:USB_WWID 118 * - MESSAGING:USB_CLASS 119 * - MEDIA:FILE_PATH 120 * - MEDIA:HARD_DRIVE 121 * - MESSAGING:URI 122 */ 123 static struct efi_device_path *shorten_path(struct efi_device_path *dp) 124 { 125 while (dp) { 126 /* 127 * TODO: Add MESSAGING:USB_WWID and MESSAGING:URI.. 128 * in practice fallback.efi just uses MEDIA:HARD_DRIVE 129 * so not sure when we would see these other cases. 130 */ 131 if (EFI_DP_TYPE(dp, MESSAGING_DEVICE, MSG_USB_CLASS) || 132 EFI_DP_TYPE(dp, MEDIA_DEVICE, HARD_DRIVE_PATH) || 133 EFI_DP_TYPE(dp, MEDIA_DEVICE, FILE_PATH)) 134 return dp; 135 136 dp = efi_dp_next(dp); 137 } 138 139 return dp; 140 } 141 142 static struct efi_object *find_obj(struct efi_device_path *dp, bool short_path, 143 struct efi_device_path **rem) 144 { 145 struct efi_object *efiobj; 146 efi_uintn_t dp_size = efi_dp_instance_size(dp); 147 148 list_for_each_entry(efiobj, &efi_obj_list, link) { 149 struct efi_handler *handler; 150 struct efi_device_path *obj_dp; 151 efi_status_t ret; 152 153 ret = efi_search_protocol(efiobj->handle, 154 &efi_guid_device_path, &handler); 155 if (ret != EFI_SUCCESS) 156 continue; 157 obj_dp = handler->protocol_interface; 158 159 do { 160 if (efi_dp_match(dp, obj_dp) == 0) { 161 if (rem) { 162 /* 163 * Allow partial matches, but inform 164 * the caller. 165 */ 166 *rem = ((void *)dp) + 167 efi_dp_instance_size(obj_dp); 168 return efiobj; 169 } else { 170 /* Only return on exact matches */ 171 if (efi_dp_instance_size(obj_dp) == 172 dp_size) 173 return efiobj; 174 } 175 } 176 177 obj_dp = shorten_path(efi_dp_next(obj_dp)); 178 } while (short_path && obj_dp); 179 } 180 181 return NULL; 182 } 183 184 /* 185 * Find an efiobj from device-path, if 'rem' is not NULL, returns the 186 * remaining part of the device path after the matched object. 187 */ 188 struct efi_object *efi_dp_find_obj(struct efi_device_path *dp, 189 struct efi_device_path **rem) 190 { 191 struct efi_object *efiobj; 192 193 /* Search for an exact match first */ 194 efiobj = find_obj(dp, false, NULL); 195 196 /* Then for a fuzzy match */ 197 if (!efiobj) 198 efiobj = find_obj(dp, false, rem); 199 200 /* And now for a fuzzy short match */ 201 if (!efiobj) 202 efiobj = find_obj(dp, true, rem); 203 204 return efiobj; 205 } 206 207 /* 208 * Determine the last device path node that is not the end node. 209 * 210 * @dp device path 211 * @return last node before the end node if it exists 212 * otherwise NULL 213 */ 214 const struct efi_device_path *efi_dp_last_node(const struct efi_device_path *dp) 215 { 216 struct efi_device_path *ret; 217 218 if (!dp || dp->type == DEVICE_PATH_TYPE_END) 219 return NULL; 220 while (dp) { 221 ret = (struct efi_device_path *)dp; 222 dp = efi_dp_next(dp); 223 } 224 return ret; 225 } 226 227 /* get size of the first device path instance excluding end node */ 228 efi_uintn_t efi_dp_instance_size(const struct efi_device_path *dp) 229 { 230 efi_uintn_t sz = 0; 231 232 if (!dp || dp->type == DEVICE_PATH_TYPE_END) 233 return 0; 234 while (dp) { 235 sz += dp->length; 236 dp = efi_dp_next(dp); 237 } 238 239 return sz; 240 } 241 242 /* get size of multi-instance device path excluding end node */ 243 efi_uintn_t efi_dp_size(const struct efi_device_path *dp) 244 { 245 const struct efi_device_path *p = dp; 246 247 if (!p) 248 return 0; 249 while (p->type != DEVICE_PATH_TYPE_END || 250 p->sub_type != DEVICE_PATH_SUB_TYPE_END) 251 p = (void *)p + p->length; 252 253 return (void *)p - (void *)dp; 254 } 255 256 /* copy multi-instance device path */ 257 struct efi_device_path *efi_dp_dup(const struct efi_device_path *dp) 258 { 259 struct efi_device_path *ndp; 260 size_t sz = efi_dp_size(dp) + sizeof(END); 261 262 if (!dp) 263 return NULL; 264 265 ndp = dp_alloc(sz); 266 if (!ndp) 267 return NULL; 268 memcpy(ndp, dp, sz); 269 270 return ndp; 271 } 272 273 struct efi_device_path *efi_dp_append(const struct efi_device_path *dp1, 274 const struct efi_device_path *dp2) 275 { 276 struct efi_device_path *ret; 277 278 if (!dp1 && !dp2) { 279 /* return an end node */ 280 ret = efi_dp_dup(&END); 281 } else if (!dp1) { 282 ret = efi_dp_dup(dp2); 283 } else if (!dp2) { 284 ret = efi_dp_dup(dp1); 285 } else { 286 /* both dp1 and dp2 are non-null */ 287 unsigned sz1 = efi_dp_size(dp1); 288 unsigned sz2 = efi_dp_size(dp2); 289 void *p = dp_alloc(sz1 + sz2 + sizeof(END)); 290 if (!p) 291 return NULL; 292 memcpy(p, dp1, sz1); 293 /* the end node of the second device path has to be retained */ 294 memcpy(p + sz1, dp2, sz2 + sizeof(END)); 295 ret = p; 296 } 297 298 return ret; 299 } 300 301 struct efi_device_path *efi_dp_append_node(const struct efi_device_path *dp, 302 const struct efi_device_path *node) 303 { 304 struct efi_device_path *ret; 305 306 if (!node && !dp) { 307 ret = efi_dp_dup(&END); 308 } else if (!node) { 309 ret = efi_dp_dup(dp); 310 } else if (!dp) { 311 size_t sz = node->length; 312 void *p = dp_alloc(sz + sizeof(END)); 313 if (!p) 314 return NULL; 315 memcpy(p, node, sz); 316 memcpy(p + sz, &END, sizeof(END)); 317 ret = p; 318 } else { 319 /* both dp and node are non-null */ 320 size_t sz = efi_dp_size(dp); 321 void *p = dp_alloc(sz + node->length + sizeof(END)); 322 if (!p) 323 return NULL; 324 memcpy(p, dp, sz); 325 memcpy(p + sz, node, node->length); 326 memcpy(p + sz + node->length, &END, sizeof(END)); 327 ret = p; 328 } 329 330 return ret; 331 } 332 333 struct efi_device_path *efi_dp_create_device_node(const u8 type, 334 const u8 sub_type, 335 const u16 length) 336 { 337 struct efi_device_path *ret; 338 339 ret = dp_alloc(length); 340 if (!ret) 341 return ret; 342 ret->type = type; 343 ret->sub_type = sub_type; 344 ret->length = length; 345 return ret; 346 } 347 348 struct efi_device_path *efi_dp_append_instance( 349 const struct efi_device_path *dp, 350 const struct efi_device_path *dpi) 351 { 352 size_t sz, szi; 353 struct efi_device_path *p, *ret; 354 355 if (!dpi) 356 return NULL; 357 if (!dp) 358 return efi_dp_dup(dpi); 359 sz = efi_dp_size(dp); 360 szi = efi_dp_instance_size(dpi); 361 p = dp_alloc(sz + szi + 2 * sizeof(END)); 362 if (!p) 363 return NULL; 364 ret = p; 365 memcpy(p, dp, sz + sizeof(END)); 366 p = (void *)p + sz; 367 p->sub_type = DEVICE_PATH_SUB_TYPE_INSTANCE_END; 368 p = (void *)p + sizeof(END); 369 memcpy(p, dpi, szi); 370 p = (void *)p + szi; 371 memcpy(p, &END, sizeof(END)); 372 return ret; 373 } 374 375 struct efi_device_path *efi_dp_get_next_instance(struct efi_device_path **dp, 376 efi_uintn_t *size) 377 { 378 size_t sz; 379 struct efi_device_path *p; 380 381 if (size) 382 *size = 0; 383 if (!dp || !*dp) 384 return NULL; 385 sz = efi_dp_instance_size(*dp); 386 p = dp_alloc(sz + sizeof(END)); 387 if (!p) 388 return NULL; 389 memcpy(p, *dp, sz + sizeof(END)); 390 *dp = (void *)*dp + sz; 391 if ((*dp)->sub_type == DEVICE_PATH_SUB_TYPE_INSTANCE_END) 392 *dp = (void *)*dp + sizeof(END); 393 else 394 *dp = NULL; 395 if (size) 396 *size = sz + sizeof(END); 397 return p; 398 } 399 400 bool efi_dp_is_multi_instance(const struct efi_device_path *dp) 401 { 402 const struct efi_device_path *p = dp; 403 404 if (!p) 405 return false; 406 while (p->type != DEVICE_PATH_TYPE_END) 407 p = (void *)p + p->length; 408 return p->sub_type == DEVICE_PATH_SUB_TYPE_INSTANCE_END; 409 } 410 411 #ifdef CONFIG_DM 412 /* size of device-path not including END node for device and all parents 413 * up to the root device. 414 */ 415 static unsigned dp_size(struct udevice *dev) 416 { 417 if (!dev || !dev->driver) 418 return sizeof(ROOT); 419 420 switch (dev->driver->id) { 421 case UCLASS_ROOT: 422 case UCLASS_SIMPLE_BUS: 423 /* stop traversing parents at this point: */ 424 return sizeof(ROOT); 425 case UCLASS_ETH: 426 return dp_size(dev->parent) + 427 sizeof(struct efi_device_path_mac_addr); 428 #ifdef CONFIG_BLK 429 case UCLASS_BLK: 430 switch (dev->parent->uclass->uc_drv->id) { 431 #ifdef CONFIG_IDE 432 case UCLASS_IDE: 433 return dp_size(dev->parent) + 434 sizeof(struct efi_device_path_atapi); 435 #endif 436 #if defined(CONFIG_SCSI) && defined(CONFIG_DM_SCSI) 437 case UCLASS_SCSI: 438 return dp_size(dev->parent) + 439 sizeof(struct efi_device_path_scsi); 440 #endif 441 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC) 442 case UCLASS_MMC: 443 return dp_size(dev->parent) + 444 sizeof(struct efi_device_path_sd_mmc_path); 445 #endif 446 default: 447 return dp_size(dev->parent); 448 } 449 #endif 450 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC) 451 case UCLASS_MMC: 452 return dp_size(dev->parent) + 453 sizeof(struct efi_device_path_sd_mmc_path); 454 #endif 455 case UCLASS_MASS_STORAGE: 456 case UCLASS_USB_HUB: 457 return dp_size(dev->parent) + 458 sizeof(struct efi_device_path_usb_class); 459 default: 460 /* just skip over unknown classes: */ 461 return dp_size(dev->parent); 462 } 463 } 464 465 /* 466 * Recursively build a device path. 467 * 468 * @buf pointer to the end of the device path 469 * @dev device 470 * @return pointer to the end of the device path 471 */ 472 static void *dp_fill(void *buf, struct udevice *dev) 473 { 474 if (!dev || !dev->driver) 475 return buf; 476 477 switch (dev->driver->id) { 478 case UCLASS_ROOT: 479 case UCLASS_SIMPLE_BUS: { 480 /* stop traversing parents at this point: */ 481 struct efi_device_path_vendor *vdp = buf; 482 *vdp = ROOT; 483 return &vdp[1]; 484 } 485 #ifdef CONFIG_DM_ETH 486 case UCLASS_ETH: { 487 struct efi_device_path_mac_addr *dp = 488 dp_fill(buf, dev->parent); 489 struct eth_pdata *pdata = dev->platdata; 490 491 dp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE; 492 dp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_MAC_ADDR; 493 dp->dp.length = sizeof(*dp); 494 memset(&dp->mac, 0, sizeof(dp->mac)); 495 /* We only support IPv4 */ 496 memcpy(&dp->mac, &pdata->enetaddr, ARP_HLEN); 497 /* Ethernet */ 498 dp->if_type = 1; 499 return &dp[1]; 500 } 501 #endif 502 #ifdef CONFIG_BLK 503 case UCLASS_BLK: 504 switch (dev->parent->uclass->uc_drv->id) { 505 #ifdef CONFIG_IDE 506 case UCLASS_IDE: { 507 struct efi_device_path_atapi *dp = 508 dp_fill(buf, dev->parent); 509 struct blk_desc *desc = dev_get_uclass_platdata(dev); 510 511 dp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE; 512 dp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_ATAPI; 513 dp->dp.length = sizeof(*dp); 514 dp->logical_unit_number = desc->devnum; 515 dp->primary_secondary = IDE_BUS(desc->devnum); 516 dp->slave_master = desc->devnum % 517 (CONFIG_SYS_IDE_MAXDEVICE / 518 CONFIG_SYS_IDE_MAXBUS); 519 return &dp[1]; 520 } 521 #endif 522 #if defined(CONFIG_SCSI) && defined(CONFIG_DM_SCSI) 523 case UCLASS_SCSI: { 524 struct efi_device_path_scsi *dp = 525 dp_fill(buf, dev->parent); 526 struct blk_desc *desc = dev_get_uclass_platdata(dev); 527 528 dp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE; 529 dp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_SCSI; 530 dp->dp.length = sizeof(*dp); 531 dp->logical_unit_number = desc->lun; 532 dp->target_id = desc->target; 533 return &dp[1]; 534 } 535 #endif 536 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC) 537 case UCLASS_MMC: { 538 struct efi_device_path_sd_mmc_path *sddp = 539 dp_fill(buf, dev->parent); 540 struct blk_desc *desc = dev_get_uclass_platdata(dev); 541 542 sddp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE; 543 sddp->dp.sub_type = is_sd(desc) ? 544 DEVICE_PATH_SUB_TYPE_MSG_SD : 545 DEVICE_PATH_SUB_TYPE_MSG_MMC; 546 sddp->dp.length = sizeof(*sddp); 547 sddp->slot_number = dev->seq; 548 return &sddp[1]; 549 } 550 #endif 551 default: 552 debug("%s(%u) %s: unhandled parent class: %s (%u)\n", 553 __FILE__, __LINE__, __func__, 554 dev->name, dev->parent->uclass->uc_drv->id); 555 return dp_fill(buf, dev->parent); 556 } 557 #endif 558 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC) 559 case UCLASS_MMC: { 560 struct efi_device_path_sd_mmc_path *sddp = 561 dp_fill(buf, dev->parent); 562 struct mmc *mmc = mmc_get_mmc_dev(dev); 563 struct blk_desc *desc = mmc_get_blk_desc(mmc); 564 565 sddp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE; 566 sddp->dp.sub_type = is_sd(desc) ? 567 DEVICE_PATH_SUB_TYPE_MSG_SD : 568 DEVICE_PATH_SUB_TYPE_MSG_MMC; 569 sddp->dp.length = sizeof(*sddp); 570 sddp->slot_number = dev->seq; 571 572 return &sddp[1]; 573 } 574 #endif 575 case UCLASS_MASS_STORAGE: 576 case UCLASS_USB_HUB: { 577 struct efi_device_path_usb_class *udp = 578 dp_fill(buf, dev->parent); 579 struct usb_device *udev = dev_get_parent_priv(dev); 580 struct usb_device_descriptor *desc = &udev->descriptor; 581 582 udp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE; 583 udp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_USB_CLASS; 584 udp->dp.length = sizeof(*udp); 585 udp->vendor_id = desc->idVendor; 586 udp->product_id = desc->idProduct; 587 udp->device_class = desc->bDeviceClass; 588 udp->device_subclass = desc->bDeviceSubClass; 589 udp->device_protocol = desc->bDeviceProtocol; 590 591 return &udp[1]; 592 } 593 default: 594 debug("%s(%u) %s: unhandled device class: %s (%u)\n", 595 __FILE__, __LINE__, __func__, 596 dev->name, dev->driver->id); 597 return dp_fill(buf, dev->parent); 598 } 599 } 600 601 /* Construct a device-path from a device: */ 602 struct efi_device_path *efi_dp_from_dev(struct udevice *dev) 603 { 604 void *buf, *start; 605 606 start = buf = dp_alloc(dp_size(dev) + sizeof(END)); 607 if (!buf) 608 return NULL; 609 buf = dp_fill(buf, dev); 610 *((struct efi_device_path *)buf) = END; 611 612 return start; 613 } 614 #endif 615 616 static unsigned dp_part_size(struct blk_desc *desc, int part) 617 { 618 unsigned dpsize; 619 620 #ifdef CONFIG_BLK 621 { 622 struct udevice *dev; 623 int ret = blk_find_device(desc->if_type, desc->devnum, &dev); 624 625 if (ret) 626 dev = desc->bdev->parent; 627 dpsize = dp_size(dev); 628 } 629 #else 630 dpsize = sizeof(ROOT) + sizeof(struct efi_device_path_usb); 631 #endif 632 633 if (part == 0) /* the actual disk, not a partition */ 634 return dpsize; 635 636 if (desc->part_type == PART_TYPE_ISO) 637 dpsize += sizeof(struct efi_device_path_cdrom_path); 638 else 639 dpsize += sizeof(struct efi_device_path_hard_drive_path); 640 641 return dpsize; 642 } 643 644 /* 645 * Create a device node for a block device partition. 646 * 647 * @buf buffer to which the device path is wirtten 648 * @desc block device descriptor 649 * @part partition number, 0 identifies a block device 650 */ 651 static void *dp_part_node(void *buf, struct blk_desc *desc, int part) 652 { 653 disk_partition_t info; 654 655 part_get_info(desc, part, &info); 656 657 if (desc->part_type == PART_TYPE_ISO) { 658 struct efi_device_path_cdrom_path *cddp = buf; 659 660 cddp->boot_entry = part; 661 cddp->dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE; 662 cddp->dp.sub_type = DEVICE_PATH_SUB_TYPE_CDROM_PATH; 663 cddp->dp.length = sizeof(*cddp); 664 cddp->partition_start = info.start; 665 cddp->partition_end = info.size; 666 667 buf = &cddp[1]; 668 } else { 669 struct efi_device_path_hard_drive_path *hddp = buf; 670 671 hddp->dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE; 672 hddp->dp.sub_type = DEVICE_PATH_SUB_TYPE_HARD_DRIVE_PATH; 673 hddp->dp.length = sizeof(*hddp); 674 hddp->partition_number = part; 675 hddp->partition_start = info.start; 676 hddp->partition_end = info.size; 677 if (desc->part_type == PART_TYPE_EFI) 678 hddp->partmap_type = 2; 679 else 680 hddp->partmap_type = 1; 681 682 switch (desc->sig_type) { 683 case SIG_TYPE_NONE: 684 default: 685 hddp->signature_type = 0; 686 memset(hddp->partition_signature, 0, 687 sizeof(hddp->partition_signature)); 688 break; 689 case SIG_TYPE_MBR: 690 hddp->signature_type = 1; 691 memset(hddp->partition_signature, 0, 692 sizeof(hddp->partition_signature)); 693 memcpy(hddp->partition_signature, &desc->mbr_sig, 694 sizeof(desc->mbr_sig)); 695 break; 696 case SIG_TYPE_GUID: 697 hddp->signature_type = 2; 698 memcpy(hddp->partition_signature, &desc->guid_sig, 699 sizeof(hddp->partition_signature)); 700 break; 701 } 702 703 buf = &hddp[1]; 704 } 705 706 return buf; 707 } 708 709 /* 710 * Create a device path for a block device or one of its partitions. 711 * 712 * @buf buffer to which the device path is wirtten 713 * @desc block device descriptor 714 * @part partition number, 0 identifies a block device 715 */ 716 static void *dp_part_fill(void *buf, struct blk_desc *desc, int part) 717 { 718 #ifdef CONFIG_BLK 719 { 720 struct udevice *dev; 721 int ret = blk_find_device(desc->if_type, desc->devnum, &dev); 722 723 if (ret) 724 dev = desc->bdev->parent; 725 buf = dp_fill(buf, dev); 726 } 727 #else 728 /* 729 * We *could* make a more accurate path, by looking at if_type 730 * and handling all the different cases like we do for non- 731 * legacy (ie CONFIG_BLK=y) case. But most important thing 732 * is just to have a unique device-path for if_type+devnum. 733 * So map things to a fictitious USB device. 734 */ 735 struct efi_device_path_usb *udp; 736 737 memcpy(buf, &ROOT, sizeof(ROOT)); 738 buf += sizeof(ROOT); 739 740 udp = buf; 741 udp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE; 742 udp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_USB; 743 udp->dp.length = sizeof(*udp); 744 udp->parent_port_number = desc->if_type; 745 udp->usb_interface = desc->devnum; 746 buf = &udp[1]; 747 #endif 748 749 if (part == 0) /* the actual disk, not a partition */ 750 return buf; 751 752 return dp_part_node(buf, desc, part); 753 } 754 755 /* Construct a device-path from a partition on a blk device: */ 756 struct efi_device_path *efi_dp_from_part(struct blk_desc *desc, int part) 757 { 758 void *buf, *start; 759 760 start = buf = dp_alloc(dp_part_size(desc, part) + sizeof(END)); 761 if (!buf) 762 return NULL; 763 764 buf = dp_part_fill(buf, desc, part); 765 766 *((struct efi_device_path *)buf) = END; 767 768 return start; 769 } 770 771 /* 772 * Create a device node for a block device partition. 773 * 774 * @buf buffer to which the device path is wirtten 775 * @desc block device descriptor 776 * @part partition number, 0 identifies a block device 777 */ 778 struct efi_device_path *efi_dp_part_node(struct blk_desc *desc, int part) 779 { 780 efi_uintn_t dpsize; 781 void *buf; 782 783 if (desc->part_type == PART_TYPE_ISO) 784 dpsize = sizeof(struct efi_device_path_cdrom_path); 785 else 786 dpsize = sizeof(struct efi_device_path_hard_drive_path); 787 buf = dp_alloc(dpsize); 788 789 dp_part_node(buf, desc, part); 790 791 return buf; 792 } 793 794 /* convert path to an UEFI style path (ie. DOS style backslashes and utf16) */ 795 static void path_to_uefi(u16 *uefi, const char *path) 796 { 797 while (*path) { 798 char c = *(path++); 799 if (c == '/') 800 c = '\\'; 801 *(uefi++) = c; 802 } 803 *uefi = '\0'; 804 } 805 806 /* 807 * If desc is NULL, this creates a path with only the file component, 808 * otherwise it creates a full path with both device and file components 809 */ 810 struct efi_device_path *efi_dp_from_file(struct blk_desc *desc, int part, 811 const char *path) 812 { 813 struct efi_device_path_file_path *fp; 814 void *buf, *start; 815 unsigned dpsize = 0, fpsize; 816 817 if (desc) 818 dpsize = dp_part_size(desc, part); 819 820 fpsize = sizeof(struct efi_device_path) + 2 * (strlen(path) + 1); 821 dpsize += fpsize; 822 823 start = buf = dp_alloc(dpsize + sizeof(END)); 824 if (!buf) 825 return NULL; 826 827 if (desc) 828 buf = dp_part_fill(buf, desc, part); 829 830 /* add file-path: */ 831 fp = buf; 832 fp->dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE; 833 fp->dp.sub_type = DEVICE_PATH_SUB_TYPE_FILE_PATH; 834 fp->dp.length = fpsize; 835 path_to_uefi(fp->str, path); 836 buf += fpsize; 837 838 *((struct efi_device_path *)buf) = END; 839 840 return start; 841 } 842 843 #ifdef CONFIG_NET 844 struct efi_device_path *efi_dp_from_eth(void) 845 { 846 #ifndef CONFIG_DM_ETH 847 struct efi_device_path_mac_addr *ndp; 848 #endif 849 void *buf, *start; 850 unsigned dpsize = 0; 851 852 assert(eth_get_dev()); 853 854 #ifdef CONFIG_DM_ETH 855 dpsize += dp_size(eth_get_dev()); 856 #else 857 dpsize += sizeof(ROOT); 858 dpsize += sizeof(*ndp); 859 #endif 860 861 start = buf = dp_alloc(dpsize + sizeof(END)); 862 if (!buf) 863 return NULL; 864 865 #ifdef CONFIG_DM_ETH 866 buf = dp_fill(buf, eth_get_dev()); 867 #else 868 memcpy(buf, &ROOT, sizeof(ROOT)); 869 buf += sizeof(ROOT); 870 871 ndp = buf; 872 ndp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE; 873 ndp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_MAC_ADDR; 874 ndp->dp.length = sizeof(*ndp); 875 ndp->if_type = 1; /* Ethernet */ 876 memcpy(ndp->mac.addr, eth_get_ethaddr(), ARP_HLEN); 877 buf = &ndp[1]; 878 #endif 879 880 *((struct efi_device_path *)buf) = END; 881 882 return start; 883 } 884 #endif 885 886 /* Construct a device-path for memory-mapped image */ 887 struct efi_device_path *efi_dp_from_mem(uint32_t memory_type, 888 uint64_t start_address, 889 uint64_t end_address) 890 { 891 struct efi_device_path_memory *mdp; 892 void *buf, *start; 893 894 start = buf = dp_alloc(sizeof(*mdp) + sizeof(END)); 895 if (!buf) 896 return NULL; 897 898 mdp = buf; 899 mdp->dp.type = DEVICE_PATH_TYPE_HARDWARE_DEVICE; 900 mdp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MEMORY; 901 mdp->dp.length = sizeof(*mdp); 902 mdp->memory_type = memory_type; 903 mdp->start_address = start_address; 904 mdp->end_address = end_address; 905 buf = &mdp[1]; 906 907 *((struct efi_device_path *)buf) = END; 908 909 return start; 910 } 911 912 /* 913 * Helper to split a full device path (containing both device and file 914 * parts) into it's constituent parts. 915 */ 916 efi_status_t efi_dp_split_file_path(struct efi_device_path *full_path, 917 struct efi_device_path **device_path, 918 struct efi_device_path **file_path) 919 { 920 struct efi_device_path *p, *dp, *fp; 921 922 *device_path = NULL; 923 *file_path = NULL; 924 dp = efi_dp_dup(full_path); 925 if (!dp) 926 return EFI_OUT_OF_RESOURCES; 927 p = dp; 928 while (!EFI_DP_TYPE(p, MEDIA_DEVICE, FILE_PATH)) { 929 p = efi_dp_next(p); 930 if (!p) 931 return EFI_OUT_OF_RESOURCES; 932 } 933 fp = efi_dp_dup(p); 934 if (!fp) 935 return EFI_OUT_OF_RESOURCES; 936 p->type = DEVICE_PATH_TYPE_END; 937 p->sub_type = DEVICE_PATH_SUB_TYPE_END; 938 p->length = sizeof(*p); 939 940 *device_path = dp; 941 *file_path = fp; 942 return EFI_SUCCESS; 943 } 944