1 /* 2 * EFI device path from u-boot device-model mapping 3 * 4 * (C) Copyright 2017 Rob Clark 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8 9 #define LOG_CATEGORY LOGL_ERR 10 11 #include <common.h> 12 #include <blk.h> 13 #include <dm.h> 14 #include <usb.h> 15 #include <mmc.h> 16 #include <efi_loader.h> 17 #include <inttypes.h> 18 #include <part.h> 19 20 /* template END node: */ 21 static const struct efi_device_path END = { 22 .type = DEVICE_PATH_TYPE_END, 23 .sub_type = DEVICE_PATH_SUB_TYPE_END, 24 .length = sizeof(END), 25 }; 26 27 #define U_BOOT_GUID \ 28 EFI_GUID(0xe61d73b9, 0xa384, 0x4acc, \ 29 0xae, 0xab, 0x82, 0xe8, 0x28, 0xf3, 0x62, 0x8b) 30 31 /* template ROOT node: */ 32 static const struct efi_device_path_vendor ROOT = { 33 .dp = { 34 .type = DEVICE_PATH_TYPE_HARDWARE_DEVICE, 35 .sub_type = DEVICE_PATH_SUB_TYPE_VENDOR, 36 .length = sizeof(ROOT), 37 }, 38 .guid = U_BOOT_GUID, 39 }; 40 41 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC) 42 /* 43 * Determine if an MMC device is an SD card. 44 * 45 * @desc block device descriptor 46 * @return true if the device is an SD card 47 */ 48 static bool is_sd(struct blk_desc *desc) 49 { 50 struct mmc *mmc = find_mmc_device(desc->devnum); 51 52 if (!mmc) 53 return false; 54 55 return IS_SD(mmc) != 0U; 56 } 57 #endif 58 59 static void *dp_alloc(size_t sz) 60 { 61 void *buf; 62 63 if (efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, sz, &buf) != 64 EFI_SUCCESS) { 65 debug("EFI: ERROR: out of memory in %s\n", __func__); 66 return NULL; 67 } 68 69 memset(buf, 0, sz); 70 return buf; 71 } 72 73 /* 74 * Iterate to next block in device-path, terminating (returning NULL) 75 * at /End* node. 76 */ 77 struct efi_device_path *efi_dp_next(const struct efi_device_path *dp) 78 { 79 if (dp == NULL) 80 return NULL; 81 if (dp->type == DEVICE_PATH_TYPE_END) 82 return NULL; 83 dp = ((void *)dp) + dp->length; 84 if (dp->type == DEVICE_PATH_TYPE_END) 85 return NULL; 86 return (struct efi_device_path *)dp; 87 } 88 89 /* 90 * Compare two device-paths, stopping when the shorter of the two hits 91 * an End* node. This is useful to, for example, compare a device-path 92 * representing a device with one representing a file on the device, or 93 * a device with a parent device. 94 */ 95 int efi_dp_match(const struct efi_device_path *a, 96 const struct efi_device_path *b) 97 { 98 while (1) { 99 int ret; 100 101 ret = memcmp(&a->length, &b->length, sizeof(a->length)); 102 if (ret) 103 return ret; 104 105 ret = memcmp(a, b, a->length); 106 if (ret) 107 return ret; 108 109 a = efi_dp_next(a); 110 b = efi_dp_next(b); 111 112 if (!a || !b) 113 return 0; 114 } 115 } 116 117 /* 118 * See UEFI spec (section 3.1.2, about short-form device-paths.. 119 * tl;dr: we can have a device-path that starts with a USB WWID 120 * or USB Class node, and a few other cases which don't encode 121 * the full device path with bus hierarchy: 122 * 123 * - MESSAGING:USB_WWID 124 * - MESSAGING:USB_CLASS 125 * - MEDIA:FILE_PATH 126 * - MEDIA:HARD_DRIVE 127 * - MESSAGING:URI 128 */ 129 static struct efi_device_path *shorten_path(struct efi_device_path *dp) 130 { 131 while (dp) { 132 /* 133 * TODO: Add MESSAGING:USB_WWID and MESSAGING:URI.. 134 * in practice fallback.efi just uses MEDIA:HARD_DRIVE 135 * so not sure when we would see these other cases. 136 */ 137 if (EFI_DP_TYPE(dp, MESSAGING_DEVICE, MSG_USB_CLASS) || 138 EFI_DP_TYPE(dp, MEDIA_DEVICE, HARD_DRIVE_PATH) || 139 EFI_DP_TYPE(dp, MEDIA_DEVICE, FILE_PATH)) 140 return dp; 141 142 dp = efi_dp_next(dp); 143 } 144 145 return dp; 146 } 147 148 static struct efi_object *find_obj(struct efi_device_path *dp, bool short_path, 149 struct efi_device_path **rem) 150 { 151 struct efi_object *efiobj; 152 unsigned int dp_size = efi_dp_size(dp); 153 154 list_for_each_entry(efiobj, &efi_obj_list, link) { 155 struct efi_handler *handler; 156 struct efi_device_path *obj_dp; 157 efi_status_t ret; 158 159 ret = efi_search_protocol(efiobj->handle, 160 &efi_guid_device_path, &handler); 161 if (ret != EFI_SUCCESS) 162 continue; 163 obj_dp = handler->protocol_interface; 164 165 do { 166 if (efi_dp_match(dp, obj_dp) == 0) { 167 if (rem) { 168 /* 169 * Allow partial matches, but inform 170 * the caller. 171 */ 172 *rem = ((void *)dp) + 173 efi_dp_size(obj_dp); 174 return efiobj; 175 } else { 176 /* Only return on exact matches */ 177 if (efi_dp_size(obj_dp) == dp_size) 178 return efiobj; 179 } 180 } 181 182 obj_dp = shorten_path(efi_dp_next(obj_dp)); 183 } while (short_path && obj_dp); 184 } 185 186 return NULL; 187 } 188 189 /* 190 * Find an efiobj from device-path, if 'rem' is not NULL, returns the 191 * remaining part of the device path after the matched object. 192 */ 193 struct efi_object *efi_dp_find_obj(struct efi_device_path *dp, 194 struct efi_device_path **rem) 195 { 196 struct efi_object *efiobj; 197 198 /* Search for an exact match first */ 199 efiobj = find_obj(dp, false, NULL); 200 201 /* Then for a fuzzy match */ 202 if (!efiobj) 203 efiobj = find_obj(dp, false, rem); 204 205 /* And now for a fuzzy short match */ 206 if (!efiobj) 207 efiobj = find_obj(dp, true, rem); 208 209 return efiobj; 210 } 211 212 /* 213 * Determine the last device path node that is not the end node. 214 * 215 * @dp device path 216 * @return last node before the end node if it exists 217 * otherwise NULL 218 */ 219 const struct efi_device_path *efi_dp_last_node(const struct efi_device_path *dp) 220 { 221 struct efi_device_path *ret; 222 223 if (!dp || dp->type == DEVICE_PATH_TYPE_END) 224 return NULL; 225 while (dp) { 226 ret = (struct efi_device_path *)dp; 227 dp = efi_dp_next(dp); 228 } 229 return ret; 230 } 231 232 /* return size not including End node: */ 233 unsigned efi_dp_size(const struct efi_device_path *dp) 234 { 235 unsigned sz = 0; 236 237 while (dp) { 238 sz += dp->length; 239 dp = efi_dp_next(dp); 240 } 241 242 return sz; 243 } 244 245 struct efi_device_path *efi_dp_dup(const struct efi_device_path *dp) 246 { 247 struct efi_device_path *ndp; 248 unsigned sz = efi_dp_size(dp) + sizeof(END); 249 250 if (!dp) 251 return NULL; 252 253 ndp = dp_alloc(sz); 254 if (!ndp) 255 return NULL; 256 memcpy(ndp, dp, sz); 257 258 return ndp; 259 } 260 261 struct efi_device_path *efi_dp_append(const struct efi_device_path *dp1, 262 const struct efi_device_path *dp2) 263 { 264 struct efi_device_path *ret; 265 266 if (!dp1) { 267 ret = efi_dp_dup(dp2); 268 } else if (!dp2) { 269 ret = efi_dp_dup(dp1); 270 } else { 271 /* both dp1 and dp2 are non-null */ 272 unsigned sz1 = efi_dp_size(dp1); 273 unsigned sz2 = efi_dp_size(dp2); 274 void *p = dp_alloc(sz1 + sz2 + sizeof(END)); 275 if (!p) 276 return NULL; 277 memcpy(p, dp1, sz1); 278 memcpy(p + sz1, dp2, sz2); 279 memcpy(p + sz1 + sz2, &END, sizeof(END)); 280 ret = p; 281 } 282 283 return ret; 284 } 285 286 struct efi_device_path *efi_dp_append_node(const struct efi_device_path *dp, 287 const struct efi_device_path *node) 288 { 289 struct efi_device_path *ret; 290 291 if (!node && !dp) { 292 ret = efi_dp_dup(&END); 293 } else if (!node) { 294 ret = efi_dp_dup(dp); 295 } else if (!dp) { 296 unsigned sz = node->length; 297 void *p = dp_alloc(sz + sizeof(END)); 298 if (!p) 299 return NULL; 300 memcpy(p, node, sz); 301 memcpy(p + sz, &END, sizeof(END)); 302 ret = p; 303 } else { 304 /* both dp and node are non-null */ 305 unsigned sz = efi_dp_size(dp); 306 void *p = dp_alloc(sz + node->length + sizeof(END)); 307 if (!p) 308 return NULL; 309 memcpy(p, dp, sz); 310 memcpy(p + sz, node, node->length); 311 memcpy(p + sz + node->length, &END, sizeof(END)); 312 ret = p; 313 } 314 315 return ret; 316 } 317 318 #ifdef CONFIG_DM 319 /* size of device-path not including END node for device and all parents 320 * up to the root device. 321 */ 322 static unsigned dp_size(struct udevice *dev) 323 { 324 if (!dev || !dev->driver) 325 return sizeof(ROOT); 326 327 switch (dev->driver->id) { 328 case UCLASS_ROOT: 329 case UCLASS_SIMPLE_BUS: 330 /* stop traversing parents at this point: */ 331 return sizeof(ROOT); 332 case UCLASS_ETH: 333 return dp_size(dev->parent) + 334 sizeof(struct efi_device_path_mac_addr); 335 #ifdef CONFIG_BLK 336 case UCLASS_BLK: 337 switch (dev->parent->uclass->uc_drv->id) { 338 #ifdef CONFIG_IDE 339 case UCLASS_IDE: 340 return dp_size(dev->parent) + 341 sizeof(struct efi_device_path_atapi); 342 #endif 343 #if defined(CONFIG_SCSI) && defined(CONFIG_DM_SCSI) 344 case UCLASS_SCSI: 345 return dp_size(dev->parent) + 346 sizeof(struct efi_device_path_scsi); 347 #endif 348 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC) 349 case UCLASS_MMC: 350 return dp_size(dev->parent) + 351 sizeof(struct efi_device_path_sd_mmc_path); 352 #endif 353 default: 354 return dp_size(dev->parent); 355 } 356 #endif 357 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC) 358 case UCLASS_MMC: 359 return dp_size(dev->parent) + 360 sizeof(struct efi_device_path_sd_mmc_path); 361 #endif 362 case UCLASS_MASS_STORAGE: 363 case UCLASS_USB_HUB: 364 return dp_size(dev->parent) + 365 sizeof(struct efi_device_path_usb_class); 366 default: 367 /* just skip over unknown classes: */ 368 return dp_size(dev->parent); 369 } 370 } 371 372 /* 373 * Recursively build a device path. 374 * 375 * @buf pointer to the end of the device path 376 * @dev device 377 * @return pointer to the end of the device path 378 */ 379 static void *dp_fill(void *buf, struct udevice *dev) 380 { 381 if (!dev || !dev->driver) 382 return buf; 383 384 switch (dev->driver->id) { 385 case UCLASS_ROOT: 386 case UCLASS_SIMPLE_BUS: { 387 /* stop traversing parents at this point: */ 388 struct efi_device_path_vendor *vdp = buf; 389 *vdp = ROOT; 390 return &vdp[1]; 391 } 392 #ifdef CONFIG_DM_ETH 393 case UCLASS_ETH: { 394 struct efi_device_path_mac_addr *dp = 395 dp_fill(buf, dev->parent); 396 struct eth_pdata *pdata = dev->platdata; 397 398 dp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE; 399 dp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_MAC_ADDR; 400 dp->dp.length = sizeof(*dp); 401 memset(&dp->mac, 0, sizeof(dp->mac)); 402 /* We only support IPv4 */ 403 memcpy(&dp->mac, &pdata->enetaddr, ARP_HLEN); 404 /* Ethernet */ 405 dp->if_type = 1; 406 return &dp[1]; 407 } 408 #endif 409 #ifdef CONFIG_BLK 410 case UCLASS_BLK: 411 switch (dev->parent->uclass->uc_drv->id) { 412 #ifdef CONFIG_IDE 413 case UCLASS_IDE: { 414 struct efi_device_path_atapi *dp = 415 dp_fill(buf, dev->parent); 416 struct blk_desc *desc = dev_get_uclass_platdata(dev); 417 418 dp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE; 419 dp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_ATAPI; 420 dp->dp.length = sizeof(*dp); 421 dp->logical_unit_number = desc->devnum; 422 dp->primary_secondary = IDE_BUS(desc->devnum); 423 dp->slave_master = desc->devnum % 424 (CONFIG_SYS_IDE_MAXDEVICE / 425 CONFIG_SYS_IDE_MAXBUS); 426 return &dp[1]; 427 } 428 #endif 429 #if defined(CONFIG_SCSI) && defined(CONFIG_DM_SCSI) 430 case UCLASS_SCSI: { 431 struct efi_device_path_scsi *dp = 432 dp_fill(buf, dev->parent); 433 struct blk_desc *desc = dev_get_uclass_platdata(dev); 434 435 dp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE; 436 dp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_SCSI; 437 dp->dp.length = sizeof(*dp); 438 dp->logical_unit_number = desc->lun; 439 dp->target_id = desc->target; 440 return &dp[1]; 441 } 442 #endif 443 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC) 444 case UCLASS_MMC: { 445 struct efi_device_path_sd_mmc_path *sddp = 446 dp_fill(buf, dev->parent); 447 struct blk_desc *desc = dev_get_uclass_platdata(dev); 448 449 sddp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE; 450 sddp->dp.sub_type = is_sd(desc) ? 451 DEVICE_PATH_SUB_TYPE_MSG_SD : 452 DEVICE_PATH_SUB_TYPE_MSG_MMC; 453 sddp->dp.length = sizeof(*sddp); 454 sddp->slot_number = dev->seq; 455 return &sddp[1]; 456 } 457 #endif 458 default: 459 debug("%s(%u) %s: unhandled parent class: %s (%u)\n", 460 __FILE__, __LINE__, __func__, 461 dev->name, dev->parent->uclass->uc_drv->id); 462 return dp_fill(buf, dev->parent); 463 } 464 #endif 465 #if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC) 466 case UCLASS_MMC: { 467 struct efi_device_path_sd_mmc_path *sddp = 468 dp_fill(buf, dev->parent); 469 struct mmc *mmc = mmc_get_mmc_dev(dev); 470 struct blk_desc *desc = mmc_get_blk_desc(mmc); 471 472 sddp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE; 473 sddp->dp.sub_type = is_sd(desc) ? 474 DEVICE_PATH_SUB_TYPE_MSG_SD : 475 DEVICE_PATH_SUB_TYPE_MSG_MMC; 476 sddp->dp.length = sizeof(*sddp); 477 sddp->slot_number = dev->seq; 478 479 return &sddp[1]; 480 } 481 #endif 482 case UCLASS_MASS_STORAGE: 483 case UCLASS_USB_HUB: { 484 struct efi_device_path_usb_class *udp = 485 dp_fill(buf, dev->parent); 486 struct usb_device *udev = dev_get_parent_priv(dev); 487 struct usb_device_descriptor *desc = &udev->descriptor; 488 489 udp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE; 490 udp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_USB_CLASS; 491 udp->dp.length = sizeof(*udp); 492 udp->vendor_id = desc->idVendor; 493 udp->product_id = desc->idProduct; 494 udp->device_class = desc->bDeviceClass; 495 udp->device_subclass = desc->bDeviceSubClass; 496 udp->device_protocol = desc->bDeviceProtocol; 497 498 return &udp[1]; 499 } 500 default: 501 debug("%s(%u) %s: unhandled device class: %s (%u)\n", 502 __FILE__, __LINE__, __func__, 503 dev->name, dev->driver->id); 504 return dp_fill(buf, dev->parent); 505 } 506 } 507 508 /* Construct a device-path from a device: */ 509 struct efi_device_path *efi_dp_from_dev(struct udevice *dev) 510 { 511 void *buf, *start; 512 513 start = buf = dp_alloc(dp_size(dev) + sizeof(END)); 514 if (!buf) 515 return NULL; 516 buf = dp_fill(buf, dev); 517 *((struct efi_device_path *)buf) = END; 518 519 return start; 520 } 521 #endif 522 523 static unsigned dp_part_size(struct blk_desc *desc, int part) 524 { 525 unsigned dpsize; 526 527 #ifdef CONFIG_BLK 528 { 529 struct udevice *dev; 530 int ret = blk_find_device(desc->if_type, desc->devnum, &dev); 531 532 if (ret) 533 dev = desc->bdev->parent; 534 dpsize = dp_size(dev); 535 } 536 #else 537 dpsize = sizeof(ROOT) + sizeof(struct efi_device_path_usb); 538 #endif 539 540 if (part == 0) /* the actual disk, not a partition */ 541 return dpsize; 542 543 if (desc->part_type == PART_TYPE_ISO) 544 dpsize += sizeof(struct efi_device_path_cdrom_path); 545 else 546 dpsize += sizeof(struct efi_device_path_hard_drive_path); 547 548 return dpsize; 549 } 550 551 /* 552 * Create a device node for a block device partition. 553 * 554 * @buf buffer to which the device path is wirtten 555 * @desc block device descriptor 556 * @part partition number, 0 identifies a block device 557 */ 558 static void *dp_part_node(void *buf, struct blk_desc *desc, int part) 559 { 560 disk_partition_t info; 561 562 part_get_info(desc, part, &info); 563 564 if (desc->part_type == PART_TYPE_ISO) { 565 struct efi_device_path_cdrom_path *cddp = buf; 566 567 cddp->boot_entry = part; 568 cddp->dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE; 569 cddp->dp.sub_type = DEVICE_PATH_SUB_TYPE_CDROM_PATH; 570 cddp->dp.length = sizeof(*cddp); 571 cddp->partition_start = info.start; 572 cddp->partition_end = info.size; 573 574 buf = &cddp[1]; 575 } else { 576 struct efi_device_path_hard_drive_path *hddp = buf; 577 578 hddp->dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE; 579 hddp->dp.sub_type = DEVICE_PATH_SUB_TYPE_HARD_DRIVE_PATH; 580 hddp->dp.length = sizeof(*hddp); 581 hddp->partition_number = part; 582 hddp->partition_start = info.start; 583 hddp->partition_end = info.size; 584 if (desc->part_type == PART_TYPE_EFI) 585 hddp->partmap_type = 2; 586 else 587 hddp->partmap_type = 1; 588 589 switch (desc->sig_type) { 590 case SIG_TYPE_NONE: 591 default: 592 hddp->signature_type = 0; 593 memset(hddp->partition_signature, 0, 594 sizeof(hddp->partition_signature)); 595 break; 596 case SIG_TYPE_MBR: 597 hddp->signature_type = 1; 598 memset(hddp->partition_signature, 0, 599 sizeof(hddp->partition_signature)); 600 memcpy(hddp->partition_signature, &desc->mbr_sig, 601 sizeof(desc->mbr_sig)); 602 break; 603 case SIG_TYPE_GUID: 604 hddp->signature_type = 2; 605 memcpy(hddp->partition_signature, &desc->guid_sig, 606 sizeof(hddp->partition_signature)); 607 break; 608 } 609 610 buf = &hddp[1]; 611 } 612 613 return buf; 614 } 615 616 /* 617 * Create a device path for a block device or one of its partitions. 618 * 619 * @buf buffer to which the device path is wirtten 620 * @desc block device descriptor 621 * @part partition number, 0 identifies a block device 622 */ 623 static void *dp_part_fill(void *buf, struct blk_desc *desc, int part) 624 { 625 #ifdef CONFIG_BLK 626 { 627 struct udevice *dev; 628 int ret = blk_find_device(desc->if_type, desc->devnum, &dev); 629 630 if (ret) 631 dev = desc->bdev->parent; 632 buf = dp_fill(buf, dev); 633 } 634 #else 635 /* 636 * We *could* make a more accurate path, by looking at if_type 637 * and handling all the different cases like we do for non- 638 * legacy (ie CONFIG_BLK=y) case. But most important thing 639 * is just to have a unique device-path for if_type+devnum. 640 * So map things to a fictitious USB device. 641 */ 642 struct efi_device_path_usb *udp; 643 644 memcpy(buf, &ROOT, sizeof(ROOT)); 645 buf += sizeof(ROOT); 646 647 udp = buf; 648 udp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE; 649 udp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_USB; 650 udp->dp.length = sizeof(*udp); 651 udp->parent_port_number = desc->if_type; 652 udp->usb_interface = desc->devnum; 653 buf = &udp[1]; 654 #endif 655 656 if (part == 0) /* the actual disk, not a partition */ 657 return buf; 658 659 return dp_part_node(buf, desc, part); 660 } 661 662 /* Construct a device-path from a partition on a blk device: */ 663 struct efi_device_path *efi_dp_from_part(struct blk_desc *desc, int part) 664 { 665 void *buf, *start; 666 667 start = buf = dp_alloc(dp_part_size(desc, part) + sizeof(END)); 668 if (!buf) 669 return NULL; 670 671 buf = dp_part_fill(buf, desc, part); 672 673 *((struct efi_device_path *)buf) = END; 674 675 return start; 676 } 677 678 /* 679 * Create a device node for a block device partition. 680 * 681 * @buf buffer to which the device path is wirtten 682 * @desc block device descriptor 683 * @part partition number, 0 identifies a block device 684 */ 685 struct efi_device_path *efi_dp_part_node(struct blk_desc *desc, int part) 686 { 687 efi_uintn_t dpsize; 688 void *buf; 689 690 if (desc->part_type == PART_TYPE_ISO) 691 dpsize = sizeof(struct efi_device_path_cdrom_path); 692 else 693 dpsize = sizeof(struct efi_device_path_hard_drive_path); 694 buf = dp_alloc(dpsize); 695 696 dp_part_node(buf, desc, part); 697 698 return buf; 699 } 700 701 /* convert path to an UEFI style path (ie. DOS style backslashes and utf16) */ 702 static void path_to_uefi(u16 *uefi, const char *path) 703 { 704 while (*path) { 705 char c = *(path++); 706 if (c == '/') 707 c = '\\'; 708 *(uefi++) = c; 709 } 710 *uefi = '\0'; 711 } 712 713 /* 714 * If desc is NULL, this creates a path with only the file component, 715 * otherwise it creates a full path with both device and file components 716 */ 717 struct efi_device_path *efi_dp_from_file(struct blk_desc *desc, int part, 718 const char *path) 719 { 720 struct efi_device_path_file_path *fp; 721 void *buf, *start; 722 unsigned dpsize = 0, fpsize; 723 724 if (desc) 725 dpsize = dp_part_size(desc, part); 726 727 fpsize = sizeof(struct efi_device_path) + 2 * (strlen(path) + 1); 728 dpsize += fpsize; 729 730 start = buf = dp_alloc(dpsize + sizeof(END)); 731 if (!buf) 732 return NULL; 733 734 if (desc) 735 buf = dp_part_fill(buf, desc, part); 736 737 /* add file-path: */ 738 fp = buf; 739 fp->dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE; 740 fp->dp.sub_type = DEVICE_PATH_SUB_TYPE_FILE_PATH; 741 fp->dp.length = fpsize; 742 path_to_uefi(fp->str, path); 743 buf += fpsize; 744 745 *((struct efi_device_path *)buf) = END; 746 747 return start; 748 } 749 750 #ifdef CONFIG_NET 751 struct efi_device_path *efi_dp_from_eth(void) 752 { 753 #ifndef CONFIG_DM_ETH 754 struct efi_device_path_mac_addr *ndp; 755 #endif 756 void *buf, *start; 757 unsigned dpsize = 0; 758 759 assert(eth_get_dev()); 760 761 #ifdef CONFIG_DM_ETH 762 dpsize += dp_size(eth_get_dev()); 763 #else 764 dpsize += sizeof(ROOT); 765 dpsize += sizeof(*ndp); 766 #endif 767 768 start = buf = dp_alloc(dpsize + sizeof(END)); 769 if (!buf) 770 return NULL; 771 772 #ifdef CONFIG_DM_ETH 773 buf = dp_fill(buf, eth_get_dev()); 774 #else 775 memcpy(buf, &ROOT, sizeof(ROOT)); 776 buf += sizeof(ROOT); 777 778 ndp = buf; 779 ndp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE; 780 ndp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_MAC_ADDR; 781 ndp->dp.length = sizeof(*ndp); 782 ndp->if_type = 1; /* Ethernet */ 783 memcpy(ndp->mac.addr, eth_get_ethaddr(), ARP_HLEN); 784 buf = &ndp[1]; 785 #endif 786 787 *((struct efi_device_path *)buf) = END; 788 789 return start; 790 } 791 #endif 792 793 /* Construct a device-path for memory-mapped image */ 794 struct efi_device_path *efi_dp_from_mem(uint32_t memory_type, 795 uint64_t start_address, 796 uint64_t end_address) 797 { 798 struct efi_device_path_memory *mdp; 799 void *buf, *start; 800 801 start = buf = dp_alloc(sizeof(*mdp) + sizeof(END)); 802 if (!buf) 803 return NULL; 804 805 mdp = buf; 806 mdp->dp.type = DEVICE_PATH_TYPE_HARDWARE_DEVICE; 807 mdp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MEMORY; 808 mdp->dp.length = sizeof(*mdp); 809 mdp->memory_type = memory_type; 810 mdp->start_address = start_address; 811 mdp->end_address = end_address; 812 buf = &mdp[1]; 813 814 *((struct efi_device_path *)buf) = END; 815 816 return start; 817 } 818 819 /* 820 * Helper to split a full device path (containing both device and file 821 * parts) into it's constituent parts. 822 */ 823 efi_status_t efi_dp_split_file_path(struct efi_device_path *full_path, 824 struct efi_device_path **device_path, 825 struct efi_device_path **file_path) 826 { 827 struct efi_device_path *p, *dp, *fp; 828 829 *device_path = NULL; 830 *file_path = NULL; 831 dp = efi_dp_dup(full_path); 832 if (!dp) 833 return EFI_OUT_OF_RESOURCES; 834 p = dp; 835 while (!EFI_DP_TYPE(p, MEDIA_DEVICE, FILE_PATH)) { 836 p = efi_dp_next(p); 837 if (!p) 838 return EFI_OUT_OF_RESOURCES; 839 } 840 fp = efi_dp_dup(p); 841 if (!fp) 842 return EFI_OUT_OF_RESOURCES; 843 p->type = DEVICE_PATH_TYPE_END; 844 p->sub_type = DEVICE_PATH_SUB_TYPE_END; 845 p->length = sizeof(*p); 846 847 *device_path = dp; 848 *file_path = fp; 849 return EFI_SUCCESS; 850 } 851