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 p = *dp; 386 sz = efi_dp_instance_size(*dp); 387 p = dp_alloc(sz + sizeof(END)); 388 if (!p) 389 return NULL; 390 memcpy(p, *dp, sz + sizeof(END)); 391 *dp = (void *)*dp + sz; 392 if ((*dp)->sub_type == DEVICE_PATH_SUB_TYPE_INSTANCE_END) 393 *dp = (void *)*dp + sizeof(END); 394 else 395 *dp = NULL; 396 if (size) 397 *size = sz + sizeof(END); 398 return p; 399 } 400 401 bool efi_dp_is_multi_instance(const struct efi_device_path *dp) 402 { 403 const struct efi_device_path *p = dp; 404 405 if (!p) 406 return false; 407 while (p->type != DEVICE_PATH_TYPE_END) 408 p = (void *)p + p->length; 409 return p->sub_type == DEVICE_PATH_SUB_TYPE_INSTANCE_END; 410 } 411 412 #ifdef CONFIG_DM 413 /* size of device-path not including END node for device and all parents 414 * up to the root device. 415 */ 416 static unsigned dp_size(struct udevice *dev) 417 { 418 if (!dev || !dev->driver) 419 return sizeof(ROOT); 420 421 switch (dev->driver->id) { 422 case UCLASS_ROOT: 423 case UCLASS_SIMPLE_BUS: 424 /* stop traversing parents at this point: */ 425 return sizeof(ROOT); 426 case UCLASS_ETH: 427 return dp_size(dev->parent) + 428 sizeof(struct efi_device_path_mac_addr); 429 #ifdef CONFIG_BLK 430 case UCLASS_BLK: 431 switch (dev->parent->uclass->uc_drv->id) { 432 #ifdef CONFIG_IDE 433 case UCLASS_IDE: 434 return dp_size(dev->parent) + 435 sizeof(struct efi_device_path_atapi); 436 #endif 437 #if defined(CONFIG_SCSI) && defined(CONFIG_DM_SCSI) 438 case UCLASS_SCSI: 439 return dp_size(dev->parent) + 440 sizeof(struct efi_device_path_scsi); 441 #endif 442 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC) 443 case UCLASS_MMC: 444 return dp_size(dev->parent) + 445 sizeof(struct efi_device_path_sd_mmc_path); 446 #endif 447 default: 448 return dp_size(dev->parent); 449 } 450 #endif 451 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC) 452 case UCLASS_MMC: 453 return dp_size(dev->parent) + 454 sizeof(struct efi_device_path_sd_mmc_path); 455 #endif 456 case UCLASS_MASS_STORAGE: 457 case UCLASS_USB_HUB: 458 return dp_size(dev->parent) + 459 sizeof(struct efi_device_path_usb_class); 460 default: 461 /* just skip over unknown classes: */ 462 return dp_size(dev->parent); 463 } 464 } 465 466 /* 467 * Recursively build a device path. 468 * 469 * @buf pointer to the end of the device path 470 * @dev device 471 * @return pointer to the end of the device path 472 */ 473 static void *dp_fill(void *buf, struct udevice *dev) 474 { 475 if (!dev || !dev->driver) 476 return buf; 477 478 switch (dev->driver->id) { 479 case UCLASS_ROOT: 480 case UCLASS_SIMPLE_BUS: { 481 /* stop traversing parents at this point: */ 482 struct efi_device_path_vendor *vdp = buf; 483 *vdp = ROOT; 484 return &vdp[1]; 485 } 486 #ifdef CONFIG_DM_ETH 487 case UCLASS_ETH: { 488 struct efi_device_path_mac_addr *dp = 489 dp_fill(buf, dev->parent); 490 struct eth_pdata *pdata = dev->platdata; 491 492 dp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE; 493 dp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_MAC_ADDR; 494 dp->dp.length = sizeof(*dp); 495 memset(&dp->mac, 0, sizeof(dp->mac)); 496 /* We only support IPv4 */ 497 memcpy(&dp->mac, &pdata->enetaddr, ARP_HLEN); 498 /* Ethernet */ 499 dp->if_type = 1; 500 return &dp[1]; 501 } 502 #endif 503 #ifdef CONFIG_BLK 504 case UCLASS_BLK: 505 switch (dev->parent->uclass->uc_drv->id) { 506 #ifdef CONFIG_IDE 507 case UCLASS_IDE: { 508 struct efi_device_path_atapi *dp = 509 dp_fill(buf, dev->parent); 510 struct blk_desc *desc = dev_get_uclass_platdata(dev); 511 512 dp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE; 513 dp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_ATAPI; 514 dp->dp.length = sizeof(*dp); 515 dp->logical_unit_number = desc->devnum; 516 dp->primary_secondary = IDE_BUS(desc->devnum); 517 dp->slave_master = desc->devnum % 518 (CONFIG_SYS_IDE_MAXDEVICE / 519 CONFIG_SYS_IDE_MAXBUS); 520 return &dp[1]; 521 } 522 #endif 523 #if defined(CONFIG_SCSI) && defined(CONFIG_DM_SCSI) 524 case UCLASS_SCSI: { 525 struct efi_device_path_scsi *dp = 526 dp_fill(buf, dev->parent); 527 struct blk_desc *desc = dev_get_uclass_platdata(dev); 528 529 dp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE; 530 dp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_SCSI; 531 dp->dp.length = sizeof(*dp); 532 dp->logical_unit_number = desc->lun; 533 dp->target_id = desc->target; 534 return &dp[1]; 535 } 536 #endif 537 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC) 538 case UCLASS_MMC: { 539 struct efi_device_path_sd_mmc_path *sddp = 540 dp_fill(buf, dev->parent); 541 struct blk_desc *desc = dev_get_uclass_platdata(dev); 542 543 sddp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE; 544 sddp->dp.sub_type = is_sd(desc) ? 545 DEVICE_PATH_SUB_TYPE_MSG_SD : 546 DEVICE_PATH_SUB_TYPE_MSG_MMC; 547 sddp->dp.length = sizeof(*sddp); 548 sddp->slot_number = dev->seq; 549 return &sddp[1]; 550 } 551 #endif 552 default: 553 debug("%s(%u) %s: unhandled parent class: %s (%u)\n", 554 __FILE__, __LINE__, __func__, 555 dev->name, dev->parent->uclass->uc_drv->id); 556 return dp_fill(buf, dev->parent); 557 } 558 #endif 559 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC) 560 case UCLASS_MMC: { 561 struct efi_device_path_sd_mmc_path *sddp = 562 dp_fill(buf, dev->parent); 563 struct mmc *mmc = mmc_get_mmc_dev(dev); 564 struct blk_desc *desc = mmc_get_blk_desc(mmc); 565 566 sddp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE; 567 sddp->dp.sub_type = is_sd(desc) ? 568 DEVICE_PATH_SUB_TYPE_MSG_SD : 569 DEVICE_PATH_SUB_TYPE_MSG_MMC; 570 sddp->dp.length = sizeof(*sddp); 571 sddp->slot_number = dev->seq; 572 573 return &sddp[1]; 574 } 575 #endif 576 case UCLASS_MASS_STORAGE: 577 case UCLASS_USB_HUB: { 578 struct efi_device_path_usb_class *udp = 579 dp_fill(buf, dev->parent); 580 struct usb_device *udev = dev_get_parent_priv(dev); 581 struct usb_device_descriptor *desc = &udev->descriptor; 582 583 udp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE; 584 udp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_USB_CLASS; 585 udp->dp.length = sizeof(*udp); 586 udp->vendor_id = desc->idVendor; 587 udp->product_id = desc->idProduct; 588 udp->device_class = desc->bDeviceClass; 589 udp->device_subclass = desc->bDeviceSubClass; 590 udp->device_protocol = desc->bDeviceProtocol; 591 592 return &udp[1]; 593 } 594 default: 595 debug("%s(%u) %s: unhandled device class: %s (%u)\n", 596 __FILE__, __LINE__, __func__, 597 dev->name, dev->driver->id); 598 return dp_fill(buf, dev->parent); 599 } 600 } 601 602 /* Construct a device-path from a device: */ 603 struct efi_device_path *efi_dp_from_dev(struct udevice *dev) 604 { 605 void *buf, *start; 606 607 start = buf = dp_alloc(dp_size(dev) + sizeof(END)); 608 if (!buf) 609 return NULL; 610 buf = dp_fill(buf, dev); 611 *((struct efi_device_path *)buf) = END; 612 613 return start; 614 } 615 #endif 616 617 static unsigned dp_part_size(struct blk_desc *desc, int part) 618 { 619 unsigned dpsize; 620 621 #ifdef CONFIG_BLK 622 { 623 struct udevice *dev; 624 int ret = blk_find_device(desc->if_type, desc->devnum, &dev); 625 626 if (ret) 627 dev = desc->bdev->parent; 628 dpsize = dp_size(dev); 629 } 630 #else 631 dpsize = sizeof(ROOT) + sizeof(struct efi_device_path_usb); 632 #endif 633 634 if (part == 0) /* the actual disk, not a partition */ 635 return dpsize; 636 637 if (desc->part_type == PART_TYPE_ISO) 638 dpsize += sizeof(struct efi_device_path_cdrom_path); 639 else 640 dpsize += sizeof(struct efi_device_path_hard_drive_path); 641 642 return dpsize; 643 } 644 645 /* 646 * Create a device node for a block device partition. 647 * 648 * @buf buffer to which the device path is wirtten 649 * @desc block device descriptor 650 * @part partition number, 0 identifies a block device 651 */ 652 static void *dp_part_node(void *buf, struct blk_desc *desc, int part) 653 { 654 disk_partition_t info; 655 656 part_get_info(desc, part, &info); 657 658 if (desc->part_type == PART_TYPE_ISO) { 659 struct efi_device_path_cdrom_path *cddp = buf; 660 661 cddp->boot_entry = part; 662 cddp->dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE; 663 cddp->dp.sub_type = DEVICE_PATH_SUB_TYPE_CDROM_PATH; 664 cddp->dp.length = sizeof(*cddp); 665 cddp->partition_start = info.start; 666 cddp->partition_end = info.size; 667 668 buf = &cddp[1]; 669 } else { 670 struct efi_device_path_hard_drive_path *hddp = buf; 671 672 hddp->dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE; 673 hddp->dp.sub_type = DEVICE_PATH_SUB_TYPE_HARD_DRIVE_PATH; 674 hddp->dp.length = sizeof(*hddp); 675 hddp->partition_number = part; 676 hddp->partition_start = info.start; 677 hddp->partition_end = info.size; 678 if (desc->part_type == PART_TYPE_EFI) 679 hddp->partmap_type = 2; 680 else 681 hddp->partmap_type = 1; 682 683 switch (desc->sig_type) { 684 case SIG_TYPE_NONE: 685 default: 686 hddp->signature_type = 0; 687 memset(hddp->partition_signature, 0, 688 sizeof(hddp->partition_signature)); 689 break; 690 case SIG_TYPE_MBR: 691 hddp->signature_type = 1; 692 memset(hddp->partition_signature, 0, 693 sizeof(hddp->partition_signature)); 694 memcpy(hddp->partition_signature, &desc->mbr_sig, 695 sizeof(desc->mbr_sig)); 696 break; 697 case SIG_TYPE_GUID: 698 hddp->signature_type = 2; 699 memcpy(hddp->partition_signature, &desc->guid_sig, 700 sizeof(hddp->partition_signature)); 701 break; 702 } 703 704 buf = &hddp[1]; 705 } 706 707 return buf; 708 } 709 710 /* 711 * Create a device path for a block device or one of its partitions. 712 * 713 * @buf buffer to which the device path is wirtten 714 * @desc block device descriptor 715 * @part partition number, 0 identifies a block device 716 */ 717 static void *dp_part_fill(void *buf, struct blk_desc *desc, int part) 718 { 719 #ifdef CONFIG_BLK 720 { 721 struct udevice *dev; 722 int ret = blk_find_device(desc->if_type, desc->devnum, &dev); 723 724 if (ret) 725 dev = desc->bdev->parent; 726 buf = dp_fill(buf, dev); 727 } 728 #else 729 /* 730 * We *could* make a more accurate path, by looking at if_type 731 * and handling all the different cases like we do for non- 732 * legacy (ie CONFIG_BLK=y) case. But most important thing 733 * is just to have a unique device-path for if_type+devnum. 734 * So map things to a fictitious USB device. 735 */ 736 struct efi_device_path_usb *udp; 737 738 memcpy(buf, &ROOT, sizeof(ROOT)); 739 buf += sizeof(ROOT); 740 741 udp = buf; 742 udp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE; 743 udp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_USB; 744 udp->dp.length = sizeof(*udp); 745 udp->parent_port_number = desc->if_type; 746 udp->usb_interface = desc->devnum; 747 buf = &udp[1]; 748 #endif 749 750 if (part == 0) /* the actual disk, not a partition */ 751 return buf; 752 753 return dp_part_node(buf, desc, part); 754 } 755 756 /* Construct a device-path from a partition on a blk device: */ 757 struct efi_device_path *efi_dp_from_part(struct blk_desc *desc, int part) 758 { 759 void *buf, *start; 760 761 start = buf = dp_alloc(dp_part_size(desc, part) + sizeof(END)); 762 if (!buf) 763 return NULL; 764 765 buf = dp_part_fill(buf, desc, part); 766 767 *((struct efi_device_path *)buf) = END; 768 769 return start; 770 } 771 772 /* 773 * Create a device node for a block device partition. 774 * 775 * @buf buffer to which the device path is wirtten 776 * @desc block device descriptor 777 * @part partition number, 0 identifies a block device 778 */ 779 struct efi_device_path *efi_dp_part_node(struct blk_desc *desc, int part) 780 { 781 efi_uintn_t dpsize; 782 void *buf; 783 784 if (desc->part_type == PART_TYPE_ISO) 785 dpsize = sizeof(struct efi_device_path_cdrom_path); 786 else 787 dpsize = sizeof(struct efi_device_path_hard_drive_path); 788 buf = dp_alloc(dpsize); 789 790 dp_part_node(buf, desc, part); 791 792 return buf; 793 } 794 795 /* convert path to an UEFI style path (ie. DOS style backslashes and utf16) */ 796 static void path_to_uefi(u16 *uefi, const char *path) 797 { 798 while (*path) { 799 char c = *(path++); 800 if (c == '/') 801 c = '\\'; 802 *(uefi++) = c; 803 } 804 *uefi = '\0'; 805 } 806 807 /* 808 * If desc is NULL, this creates a path with only the file component, 809 * otherwise it creates a full path with both device and file components 810 */ 811 struct efi_device_path *efi_dp_from_file(struct blk_desc *desc, int part, 812 const char *path) 813 { 814 struct efi_device_path_file_path *fp; 815 void *buf, *start; 816 unsigned dpsize = 0, fpsize; 817 818 if (desc) 819 dpsize = dp_part_size(desc, part); 820 821 fpsize = sizeof(struct efi_device_path) + 2 * (strlen(path) + 1); 822 dpsize += fpsize; 823 824 start = buf = dp_alloc(dpsize + sizeof(END)); 825 if (!buf) 826 return NULL; 827 828 if (desc) 829 buf = dp_part_fill(buf, desc, part); 830 831 /* add file-path: */ 832 fp = buf; 833 fp->dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE; 834 fp->dp.sub_type = DEVICE_PATH_SUB_TYPE_FILE_PATH; 835 fp->dp.length = fpsize; 836 path_to_uefi(fp->str, path); 837 buf += fpsize; 838 839 *((struct efi_device_path *)buf) = END; 840 841 return start; 842 } 843 844 #ifdef CONFIG_NET 845 struct efi_device_path *efi_dp_from_eth(void) 846 { 847 #ifndef CONFIG_DM_ETH 848 struct efi_device_path_mac_addr *ndp; 849 #endif 850 void *buf, *start; 851 unsigned dpsize = 0; 852 853 assert(eth_get_dev()); 854 855 #ifdef CONFIG_DM_ETH 856 dpsize += dp_size(eth_get_dev()); 857 #else 858 dpsize += sizeof(ROOT); 859 dpsize += sizeof(*ndp); 860 #endif 861 862 start = buf = dp_alloc(dpsize + sizeof(END)); 863 if (!buf) 864 return NULL; 865 866 #ifdef CONFIG_DM_ETH 867 buf = dp_fill(buf, eth_get_dev()); 868 #else 869 memcpy(buf, &ROOT, sizeof(ROOT)); 870 buf += sizeof(ROOT); 871 872 ndp = buf; 873 ndp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE; 874 ndp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_MAC_ADDR; 875 ndp->dp.length = sizeof(*ndp); 876 ndp->if_type = 1; /* Ethernet */ 877 memcpy(ndp->mac.addr, eth_get_ethaddr(), ARP_HLEN); 878 buf = &ndp[1]; 879 #endif 880 881 *((struct efi_device_path *)buf) = END; 882 883 return start; 884 } 885 #endif 886 887 /* Construct a device-path for memory-mapped image */ 888 struct efi_device_path *efi_dp_from_mem(uint32_t memory_type, 889 uint64_t start_address, 890 uint64_t end_address) 891 { 892 struct efi_device_path_memory *mdp; 893 void *buf, *start; 894 895 start = buf = dp_alloc(sizeof(*mdp) + sizeof(END)); 896 if (!buf) 897 return NULL; 898 899 mdp = buf; 900 mdp->dp.type = DEVICE_PATH_TYPE_HARDWARE_DEVICE; 901 mdp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MEMORY; 902 mdp->dp.length = sizeof(*mdp); 903 mdp->memory_type = memory_type; 904 mdp->start_address = start_address; 905 mdp->end_address = end_address; 906 buf = &mdp[1]; 907 908 *((struct efi_device_path *)buf) = END; 909 910 return start; 911 } 912 913 /* 914 * Helper to split a full device path (containing both device and file 915 * parts) into it's constituent parts. 916 */ 917 efi_status_t efi_dp_split_file_path(struct efi_device_path *full_path, 918 struct efi_device_path **device_path, 919 struct efi_device_path **file_path) 920 { 921 struct efi_device_path *p, *dp, *fp; 922 923 *device_path = NULL; 924 *file_path = NULL; 925 dp = efi_dp_dup(full_path); 926 if (!dp) 927 return EFI_OUT_OF_RESOURCES; 928 p = dp; 929 while (!EFI_DP_TYPE(p, MEDIA_DEVICE, FILE_PATH)) { 930 p = efi_dp_next(p); 931 if (!p) 932 return EFI_OUT_OF_RESOURCES; 933 } 934 fp = efi_dp_dup(p); 935 if (!fp) 936 return EFI_OUT_OF_RESOURCES; 937 p->type = DEVICE_PATH_TYPE_END; 938 p->sub_type = DEVICE_PATH_SUB_TYPE_END; 939 p->length = sizeof(*p); 940 941 *device_path = dp; 942 *file_path = fp; 943 return EFI_SUCCESS; 944 } 945