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