1 /* 2 * EFI application boot time services 3 * 4 * Copyright (c) 2016 Alexander Graf 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8 9 #include <common.h> 10 #include <div64.h> 11 #include <efi_loader.h> 12 #include <environment.h> 13 #include <malloc.h> 14 #include <asm/global_data.h> 15 #include <libfdt_env.h> 16 #include <u-boot/crc.h> 17 #include <bootm.h> 18 #include <inttypes.h> 19 #include <watchdog.h> 20 21 DECLARE_GLOBAL_DATA_PTR; 22 23 /* Task priority level */ 24 static efi_uintn_t efi_tpl = TPL_APPLICATION; 25 26 /* This list contains all the EFI objects our payload has access to */ 27 LIST_HEAD(efi_obj_list); 28 29 /* 30 * If we're running on nasty systems (32bit ARM booting into non-EFI Linux) 31 * we need to do trickery with caches. Since we don't want to break the EFI 32 * aware boot path, only apply hacks when loading exiting directly (breaking 33 * direct Linux EFI booting along the way - oh well). 34 */ 35 static bool efi_is_direct_boot = true; 36 37 /* 38 * EFI can pass arbitrary additional "tables" containing vendor specific 39 * information to the payload. One such table is the FDT table which contains 40 * a pointer to a flattened device tree blob. 41 * 42 * In most cases we want to pass an FDT to the payload, so reserve one slot of 43 * config table space for it. The pointer gets populated by do_bootefi_exec(). 44 */ 45 static struct efi_configuration_table __efi_runtime_data efi_conf_table[2]; 46 47 #ifdef CONFIG_ARM 48 /* 49 * The "gd" pointer lives in a register on ARM and AArch64 that we declare 50 * fixed when compiling U-Boot. However, the payload does not know about that 51 * restriction so we need to manually swap its and our view of that register on 52 * EFI callback entry/exit. 53 */ 54 static volatile void *efi_gd, *app_gd; 55 #endif 56 57 static int entry_count; 58 static int nesting_level; 59 60 /* Called on every callback entry */ 61 int __efi_entry_check(void) 62 { 63 int ret = entry_count++ == 0; 64 #ifdef CONFIG_ARM 65 assert(efi_gd); 66 app_gd = gd; 67 gd = efi_gd; 68 #endif 69 return ret; 70 } 71 72 /* Called on every callback exit */ 73 int __efi_exit_check(void) 74 { 75 int ret = --entry_count == 0; 76 #ifdef CONFIG_ARM 77 gd = app_gd; 78 #endif 79 return ret; 80 } 81 82 /* Called from do_bootefi_exec() */ 83 void efi_save_gd(void) 84 { 85 #ifdef CONFIG_ARM 86 efi_gd = gd; 87 #endif 88 } 89 90 /* 91 * Special case handler for error/abort that just forces things back 92 * to u-boot world so we can dump out an abort msg, without any care 93 * about returning back to UEFI world. 94 */ 95 void efi_restore_gd(void) 96 { 97 #ifdef CONFIG_ARM 98 /* Only restore if we're already in EFI context */ 99 if (!efi_gd) 100 return; 101 gd = efi_gd; 102 #endif 103 } 104 105 /* 106 * Two spaces per indent level, maxing out at 10.. which ought to be 107 * enough for anyone ;-) 108 */ 109 static const char *indent_string(int level) 110 { 111 const char *indent = " "; 112 const int max = strlen(indent); 113 level = min(max, level * 2); 114 return &indent[max - level]; 115 } 116 117 const char *__efi_nesting(void) 118 { 119 return indent_string(nesting_level); 120 } 121 122 const char *__efi_nesting_inc(void) 123 { 124 return indent_string(nesting_level++); 125 } 126 127 const char *__efi_nesting_dec(void) 128 { 129 return indent_string(--nesting_level); 130 } 131 132 /* 133 * Queue an EFI event. 134 * 135 * This function queues the notification function of the event for future 136 * execution. 137 * 138 * The notification function is called if the task priority level of the 139 * event is higher than the current task priority level. 140 * 141 * For the SignalEvent service see efi_signal_event_ext. 142 * 143 * @event event to signal 144 */ 145 void efi_signal_event(struct efi_event *event) 146 { 147 if (event->notify_function) { 148 event->is_queued = true; 149 /* Check TPL */ 150 if (efi_tpl >= event->notify_tpl) 151 return; 152 EFI_CALL_VOID(event->notify_function(event, 153 event->notify_context)); 154 } 155 event->is_queued = false; 156 } 157 158 /* 159 * Raise the task priority level. 160 * 161 * This function implements the RaiseTpl service. 162 * See the Unified Extensible Firmware Interface (UEFI) specification 163 * for details. 164 * 165 * @new_tpl new value of the task priority level 166 * @return old value of the task priority level 167 */ 168 static unsigned long EFIAPI efi_raise_tpl(efi_uintn_t new_tpl) 169 { 170 efi_uintn_t old_tpl = efi_tpl; 171 172 EFI_ENTRY("0x%zx", new_tpl); 173 174 if (new_tpl < efi_tpl) 175 debug("WARNING: new_tpl < current_tpl in %s\n", __func__); 176 efi_tpl = new_tpl; 177 if (efi_tpl > TPL_HIGH_LEVEL) 178 efi_tpl = TPL_HIGH_LEVEL; 179 180 EFI_EXIT(EFI_SUCCESS); 181 return old_tpl; 182 } 183 184 /* 185 * Lower the task priority level. 186 * 187 * This function implements the RestoreTpl service. 188 * See the Unified Extensible Firmware Interface (UEFI) specification 189 * for details. 190 * 191 * @old_tpl value of the task priority level to be restored 192 */ 193 static void EFIAPI efi_restore_tpl(efi_uintn_t old_tpl) 194 { 195 EFI_ENTRY("0x%zx", old_tpl); 196 197 if (old_tpl > efi_tpl) 198 debug("WARNING: old_tpl > current_tpl in %s\n", __func__); 199 efi_tpl = old_tpl; 200 if (efi_tpl > TPL_HIGH_LEVEL) 201 efi_tpl = TPL_HIGH_LEVEL; 202 203 EFI_EXIT(EFI_SUCCESS); 204 } 205 206 /* 207 * Allocate memory pages. 208 * 209 * This function implements the AllocatePages service. 210 * See the Unified Extensible Firmware Interface (UEFI) specification 211 * for details. 212 * 213 * @type type of allocation to be performed 214 * @memory_type usage type of the allocated memory 215 * @pages number of pages to be allocated 216 * @memory allocated memory 217 * @return status code 218 */ 219 static efi_status_t EFIAPI efi_allocate_pages_ext(int type, int memory_type, 220 efi_uintn_t pages, 221 uint64_t *memory) 222 { 223 efi_status_t r; 224 225 EFI_ENTRY("%d, %d, 0x%zx, %p", type, memory_type, pages, memory); 226 r = efi_allocate_pages(type, memory_type, pages, memory); 227 return EFI_EXIT(r); 228 } 229 230 /* 231 * Free memory pages. 232 * 233 * This function implements the FreePages service. 234 * See the Unified Extensible Firmware Interface (UEFI) specification 235 * for details. 236 * 237 * @memory start of the memory area to be freed 238 * @pages number of pages to be freed 239 * @return status code 240 */ 241 static efi_status_t EFIAPI efi_free_pages_ext(uint64_t memory, 242 efi_uintn_t pages) 243 { 244 efi_status_t r; 245 246 EFI_ENTRY("%"PRIx64", 0x%zx", memory, pages); 247 r = efi_free_pages(memory, pages); 248 return EFI_EXIT(r); 249 } 250 251 /* 252 * Get map describing memory usage. 253 * 254 * This function implements the GetMemoryMap service. 255 * See the Unified Extensible Firmware Interface (UEFI) specification 256 * for details. 257 * 258 * @memory_map_size on entry the size, in bytes, of the memory map buffer, 259 * on exit the size of the copied memory map 260 * @memory_map buffer to which the memory map is written 261 * @map_key key for the memory map 262 * @descriptor_size size of an individual memory descriptor 263 * @descriptor_version version number of the memory descriptor structure 264 * @return status code 265 */ 266 static efi_status_t EFIAPI efi_get_memory_map_ext( 267 efi_uintn_t *memory_map_size, 268 struct efi_mem_desc *memory_map, 269 efi_uintn_t *map_key, 270 efi_uintn_t *descriptor_size, 271 uint32_t *descriptor_version) 272 { 273 efi_status_t r; 274 275 EFI_ENTRY("%p, %p, %p, %p, %p", memory_map_size, memory_map, 276 map_key, descriptor_size, descriptor_version); 277 r = efi_get_memory_map(memory_map_size, memory_map, map_key, 278 descriptor_size, descriptor_version); 279 return EFI_EXIT(r); 280 } 281 282 /* 283 * Allocate memory from pool. 284 * 285 * This function implements the AllocatePool service. 286 * See the Unified Extensible Firmware Interface (UEFI) specification 287 * for details. 288 * 289 * @pool_type type of the pool from which memory is to be allocated 290 * @size number of bytes to be allocated 291 * @buffer allocated memory 292 * @return status code 293 */ 294 static efi_status_t EFIAPI efi_allocate_pool_ext(int pool_type, 295 efi_uintn_t size, 296 void **buffer) 297 { 298 efi_status_t r; 299 300 EFI_ENTRY("%d, %zd, %p", pool_type, size, buffer); 301 r = efi_allocate_pool(pool_type, size, buffer); 302 return EFI_EXIT(r); 303 } 304 305 /* 306 * Free memory from pool. 307 * 308 * This function implements the FreePool service. 309 * See the Unified Extensible Firmware Interface (UEFI) specification 310 * for details. 311 * 312 * @buffer start of memory to be freed 313 * @return status code 314 */ 315 static efi_status_t EFIAPI efi_free_pool_ext(void *buffer) 316 { 317 efi_status_t r; 318 319 EFI_ENTRY("%p", buffer); 320 r = efi_free_pool(buffer); 321 return EFI_EXIT(r); 322 } 323 324 /* 325 * Add a new object to the object list. 326 * 327 * The protocols list is initialized. 328 * The object handle is set. 329 * 330 * @obj object to be added 331 */ 332 void efi_add_handle(struct efi_object *obj) 333 { 334 if (!obj) 335 return; 336 INIT_LIST_HEAD(&obj->protocols); 337 obj->handle = obj; 338 list_add_tail(&obj->link, &efi_obj_list); 339 } 340 341 /* 342 * Create handle. 343 * 344 * @handle new handle 345 * @return status code 346 */ 347 efi_status_t efi_create_handle(void **handle) 348 { 349 struct efi_object *obj; 350 efi_status_t r; 351 352 r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, 353 sizeof(struct efi_object), 354 (void **)&obj); 355 if (r != EFI_SUCCESS) 356 return r; 357 efi_add_handle(obj); 358 *handle = obj->handle; 359 return r; 360 } 361 362 /* 363 * Our event capabilities are very limited. Only a small limited 364 * number of events is allowed to coexist. 365 */ 366 static struct efi_event efi_events[16]; 367 368 /* 369 * Create an event. 370 * 371 * This function is used inside U-Boot code to create an event. 372 * 373 * For the API function implementing the CreateEvent service see 374 * efi_create_event_ext. 375 * 376 * @type type of the event to create 377 * @notify_tpl task priority level of the event 378 * @notify_function notification function of the event 379 * @notify_context pointer passed to the notification function 380 * @event created event 381 * @return status code 382 */ 383 efi_status_t efi_create_event(uint32_t type, efi_uintn_t notify_tpl, 384 void (EFIAPI *notify_function) ( 385 struct efi_event *event, 386 void *context), 387 void *notify_context, struct efi_event **event) 388 { 389 int i; 390 391 if (event == NULL) 392 return EFI_INVALID_PARAMETER; 393 394 if ((type & EVT_NOTIFY_SIGNAL) && (type & EVT_NOTIFY_WAIT)) 395 return EFI_INVALID_PARAMETER; 396 397 if ((type & (EVT_NOTIFY_SIGNAL|EVT_NOTIFY_WAIT)) && 398 notify_function == NULL) 399 return EFI_INVALID_PARAMETER; 400 401 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) { 402 if (efi_events[i].type) 403 continue; 404 efi_events[i].type = type; 405 efi_events[i].notify_tpl = notify_tpl; 406 efi_events[i].notify_function = notify_function; 407 efi_events[i].notify_context = notify_context; 408 /* Disable timers on bootup */ 409 efi_events[i].trigger_next = -1ULL; 410 efi_events[i].is_queued = false; 411 efi_events[i].is_signaled = false; 412 *event = &efi_events[i]; 413 return EFI_SUCCESS; 414 } 415 return EFI_OUT_OF_RESOURCES; 416 } 417 418 /* 419 * Create an event. 420 * 421 * This function implements the CreateEvent service. 422 * See the Unified Extensible Firmware Interface (UEFI) specification 423 * for details. 424 * 425 * @type type of the event to create 426 * @notify_tpl task priority level of the event 427 * @notify_function notification function of the event 428 * @notify_context pointer passed to the notification function 429 * @event created event 430 * @return status code 431 */ 432 static efi_status_t EFIAPI efi_create_event_ext( 433 uint32_t type, efi_uintn_t notify_tpl, 434 void (EFIAPI *notify_function) ( 435 struct efi_event *event, 436 void *context), 437 void *notify_context, struct efi_event **event) 438 { 439 EFI_ENTRY("%d, 0x%zx, %p, %p", type, notify_tpl, notify_function, 440 notify_context); 441 return EFI_EXIT(efi_create_event(type, notify_tpl, notify_function, 442 notify_context, event)); 443 } 444 445 446 /* 447 * Check if a timer event has occurred or a queued notification function should 448 * be called. 449 * 450 * Our timers have to work without interrupts, so we check whenever keyboard 451 * input or disk accesses happen if enough time elapsed for them to fire. 452 */ 453 void efi_timer_check(void) 454 { 455 int i; 456 u64 now = timer_get_us(); 457 458 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) { 459 if (!efi_events[i].type) 460 continue; 461 if (efi_events[i].is_queued) 462 efi_signal_event(&efi_events[i]); 463 if (!(efi_events[i].type & EVT_TIMER) || 464 now < efi_events[i].trigger_next) 465 continue; 466 switch (efi_events[i].trigger_type) { 467 case EFI_TIMER_RELATIVE: 468 efi_events[i].trigger_type = EFI_TIMER_STOP; 469 break; 470 case EFI_TIMER_PERIODIC: 471 efi_events[i].trigger_next += 472 efi_events[i].trigger_time; 473 break; 474 default: 475 continue; 476 } 477 efi_events[i].is_signaled = true; 478 efi_signal_event(&efi_events[i]); 479 } 480 WATCHDOG_RESET(); 481 } 482 483 /* 484 * Set the trigger time for a timer event or stop the event. 485 * 486 * This is the function for internal usage in U-Boot. For the API function 487 * implementing the SetTimer service see efi_set_timer_ext. 488 * 489 * @event event for which the timer is set 490 * @type type of the timer 491 * @trigger_time trigger period in multiples of 100ns 492 * @return status code 493 */ 494 efi_status_t efi_set_timer(struct efi_event *event, enum efi_timer_delay type, 495 uint64_t trigger_time) 496 { 497 int i; 498 499 /* 500 * The parameter defines a multiple of 100ns. 501 * We use multiples of 1000ns. So divide by 10. 502 */ 503 do_div(trigger_time, 10); 504 505 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) { 506 if (event != &efi_events[i]) 507 continue; 508 509 if (!(event->type & EVT_TIMER)) 510 break; 511 switch (type) { 512 case EFI_TIMER_STOP: 513 event->trigger_next = -1ULL; 514 break; 515 case EFI_TIMER_PERIODIC: 516 case EFI_TIMER_RELATIVE: 517 event->trigger_next = 518 timer_get_us() + trigger_time; 519 break; 520 default: 521 return EFI_INVALID_PARAMETER; 522 } 523 event->trigger_type = type; 524 event->trigger_time = trigger_time; 525 event->is_signaled = false; 526 return EFI_SUCCESS; 527 } 528 return EFI_INVALID_PARAMETER; 529 } 530 531 /* 532 * Set the trigger time for a timer event or stop the event. 533 * 534 * This function implements the SetTimer service. 535 * See the Unified Extensible Firmware Interface (UEFI) specification 536 * for details. 537 * 538 * @event event for which the timer is set 539 * @type type of the timer 540 * @trigger_time trigger period in multiples of 100ns 541 * @return status code 542 */ 543 static efi_status_t EFIAPI efi_set_timer_ext(struct efi_event *event, 544 enum efi_timer_delay type, 545 uint64_t trigger_time) 546 { 547 EFI_ENTRY("%p, %d, %"PRIx64, event, type, trigger_time); 548 return EFI_EXIT(efi_set_timer(event, type, trigger_time)); 549 } 550 551 /* 552 * Wait for events to be signaled. 553 * 554 * This function implements the WaitForEvent service. 555 * See the Unified Extensible Firmware Interface (UEFI) specification 556 * for details. 557 * 558 * @num_events number of events to be waited for 559 * @events events to be waited for 560 * @index index of the event that was signaled 561 * @return status code 562 */ 563 static efi_status_t EFIAPI efi_wait_for_event(efi_uintn_t num_events, 564 struct efi_event **event, 565 efi_uintn_t *index) 566 { 567 int i, j; 568 569 EFI_ENTRY("%zd, %p, %p", num_events, event, index); 570 571 /* Check parameters */ 572 if (!num_events || !event) 573 return EFI_EXIT(EFI_INVALID_PARAMETER); 574 /* Check TPL */ 575 if (efi_tpl != TPL_APPLICATION) 576 return EFI_EXIT(EFI_UNSUPPORTED); 577 for (i = 0; i < num_events; ++i) { 578 for (j = 0; j < ARRAY_SIZE(efi_events); ++j) { 579 if (event[i] == &efi_events[j]) 580 goto known_event; 581 } 582 return EFI_EXIT(EFI_INVALID_PARAMETER); 583 known_event: 584 if (!event[i]->type || event[i]->type & EVT_NOTIFY_SIGNAL) 585 return EFI_EXIT(EFI_INVALID_PARAMETER); 586 if (!event[i]->is_signaled) 587 efi_signal_event(event[i]); 588 } 589 590 /* Wait for signal */ 591 for (;;) { 592 for (i = 0; i < num_events; ++i) { 593 if (event[i]->is_signaled) 594 goto out; 595 } 596 /* Allow events to occur. */ 597 efi_timer_check(); 598 } 599 600 out: 601 /* 602 * Reset the signal which is passed to the caller to allow periodic 603 * events to occur. 604 */ 605 event[i]->is_signaled = false; 606 if (index) 607 *index = i; 608 609 return EFI_EXIT(EFI_SUCCESS); 610 } 611 612 /* 613 * Signal an EFI event. 614 * 615 * This function implements the SignalEvent service. 616 * See the Unified Extensible Firmware Interface (UEFI) specification 617 * for details. 618 * 619 * This functions sets the signaled state of the event and queues the 620 * notification function for execution. 621 * 622 * @event event to signal 623 * @return status code 624 */ 625 static efi_status_t EFIAPI efi_signal_event_ext(struct efi_event *event) 626 { 627 int i; 628 629 EFI_ENTRY("%p", event); 630 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) { 631 if (event != &efi_events[i]) 632 continue; 633 if (event->is_signaled) 634 break; 635 event->is_signaled = true; 636 if (event->type & EVT_NOTIFY_SIGNAL) 637 efi_signal_event(event); 638 break; 639 } 640 return EFI_EXIT(EFI_SUCCESS); 641 } 642 643 /* 644 * Close an EFI event. 645 * 646 * This function implements the CloseEvent service. 647 * See the Unified Extensible Firmware Interface (UEFI) specification 648 * for details. 649 * 650 * @event event to close 651 * @return status code 652 */ 653 static efi_status_t EFIAPI efi_close_event(struct efi_event *event) 654 { 655 int i; 656 657 EFI_ENTRY("%p", event); 658 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) { 659 if (event == &efi_events[i]) { 660 event->type = 0; 661 event->trigger_next = -1ULL; 662 event->is_queued = false; 663 event->is_signaled = false; 664 return EFI_EXIT(EFI_SUCCESS); 665 } 666 } 667 return EFI_EXIT(EFI_INVALID_PARAMETER); 668 } 669 670 /* 671 * Check if an event is signaled. 672 * 673 * This function implements the CheckEvent service. 674 * See the Unified Extensible Firmware Interface (UEFI) specification 675 * for details. 676 * 677 * If an event is not signaled yet the notification function is queued. 678 * 679 * @event event to check 680 * @return status code 681 */ 682 static efi_status_t EFIAPI efi_check_event(struct efi_event *event) 683 { 684 int i; 685 686 EFI_ENTRY("%p", event); 687 efi_timer_check(); 688 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) { 689 if (event != &efi_events[i]) 690 continue; 691 if (!event->type || event->type & EVT_NOTIFY_SIGNAL) 692 break; 693 if (!event->is_signaled) 694 efi_signal_event(event); 695 if (event->is_signaled) 696 return EFI_EXIT(EFI_SUCCESS); 697 return EFI_EXIT(EFI_NOT_READY); 698 } 699 return EFI_EXIT(EFI_INVALID_PARAMETER); 700 } 701 702 /* 703 * Find the internal EFI object for a handle. 704 * 705 * @handle handle to find 706 * @return EFI object 707 */ 708 struct efi_object *efi_search_obj(const void *handle) 709 { 710 struct efi_object *efiobj; 711 712 list_for_each_entry(efiobj, &efi_obj_list, link) { 713 if (efiobj->handle == handle) 714 return efiobj; 715 } 716 717 return NULL; 718 } 719 720 /* 721 * Find a protocol on a handle. 722 * 723 * @handle handle 724 * @protocol_guid GUID of the protocol 725 * @handler reference to the protocol 726 * @return status code 727 */ 728 efi_status_t efi_search_protocol(const void *handle, 729 const efi_guid_t *protocol_guid, 730 struct efi_handler **handler) 731 { 732 struct efi_object *efiobj; 733 struct list_head *lhandle; 734 735 if (!handle || !protocol_guid) 736 return EFI_INVALID_PARAMETER; 737 efiobj = efi_search_obj(handle); 738 if (!efiobj) 739 return EFI_INVALID_PARAMETER; 740 list_for_each(lhandle, &efiobj->protocols) { 741 struct efi_handler *protocol; 742 743 protocol = list_entry(lhandle, struct efi_handler, link); 744 if (!guidcmp(protocol->guid, protocol_guid)) { 745 if (handler) 746 *handler = protocol; 747 return EFI_SUCCESS; 748 } 749 } 750 return EFI_NOT_FOUND; 751 } 752 753 /* 754 * Install new protocol on a handle. 755 * 756 * @handle handle on which the protocol shall be installed 757 * @protocol GUID of the protocol to be installed 758 * @protocol_interface interface of the protocol implementation 759 * @return status code 760 */ 761 efi_status_t efi_add_protocol(const void *handle, const efi_guid_t *protocol, 762 void *protocol_interface) 763 { 764 struct efi_object *efiobj; 765 struct efi_handler *handler; 766 efi_status_t ret; 767 768 efiobj = efi_search_obj(handle); 769 if (!efiobj) 770 return EFI_INVALID_PARAMETER; 771 ret = efi_search_protocol(handle, protocol, NULL); 772 if (ret != EFI_NOT_FOUND) 773 return EFI_INVALID_PARAMETER; 774 handler = calloc(1, sizeof(struct efi_handler)); 775 if (!handler) 776 return EFI_OUT_OF_RESOURCES; 777 handler->guid = protocol; 778 handler->protocol_interface = protocol_interface; 779 list_add_tail(&handler->link, &efiobj->protocols); 780 return EFI_SUCCESS; 781 } 782 783 /* 784 * Delete protocol from a handle. 785 * 786 * @handle handle from which the protocol shall be deleted 787 * @protocol GUID of the protocol to be deleted 788 * @protocol_interface interface of the protocol implementation 789 * @return status code 790 */ 791 efi_status_t efi_remove_protocol(const void *handle, const efi_guid_t *protocol, 792 void *protocol_interface) 793 { 794 struct efi_handler *handler; 795 efi_status_t ret; 796 797 ret = efi_search_protocol(handle, protocol, &handler); 798 if (ret != EFI_SUCCESS) 799 return ret; 800 if (guidcmp(handler->guid, protocol)) 801 return EFI_INVALID_PARAMETER; 802 list_del(&handler->link); 803 free(handler); 804 return EFI_SUCCESS; 805 } 806 807 /* 808 * Delete all protocols from a handle. 809 * 810 * @handle handle from which the protocols shall be deleted 811 * @return status code 812 */ 813 efi_status_t efi_remove_all_protocols(const void *handle) 814 { 815 struct efi_object *efiobj; 816 struct list_head *lhandle; 817 struct list_head *pos; 818 819 efiobj = efi_search_obj(handle); 820 if (!efiobj) 821 return EFI_INVALID_PARAMETER; 822 list_for_each_safe(lhandle, pos, &efiobj->protocols) { 823 struct efi_handler *protocol; 824 efi_status_t ret; 825 826 protocol = list_entry(lhandle, struct efi_handler, link); 827 828 ret = efi_remove_protocol(handle, protocol->guid, 829 protocol->protocol_interface); 830 if (ret != EFI_SUCCESS) 831 return ret; 832 } 833 return EFI_SUCCESS; 834 } 835 836 /* 837 * Install protocol interface. 838 * 839 * This function implements the InstallProtocolInterface service. 840 * See the Unified Extensible Firmware Interface (UEFI) specification 841 * for details. 842 * 843 * @handle handle on which the protocol shall be installed 844 * @protocol GUID of the protocol to be installed 845 * @protocol_interface_type type of the interface to be installed, 846 * always EFI_NATIVE_INTERFACE 847 * @protocol_interface interface of the protocol implementation 848 * @return status code 849 */ 850 static efi_status_t EFIAPI efi_install_protocol_interface( 851 void **handle, const efi_guid_t *protocol, 852 int protocol_interface_type, void *protocol_interface) 853 { 854 efi_status_t r; 855 856 EFI_ENTRY("%p, %pUl, %d, %p", handle, protocol, protocol_interface_type, 857 protocol_interface); 858 859 if (!handle || !protocol || 860 protocol_interface_type != EFI_NATIVE_INTERFACE) { 861 r = EFI_INVALID_PARAMETER; 862 goto out; 863 } 864 865 /* Create new handle if requested. */ 866 if (!*handle) { 867 r = efi_create_handle(handle); 868 if (r != EFI_SUCCESS) 869 goto out; 870 debug("%sEFI: new handle %p\n", indent_string(nesting_level), 871 *handle); 872 } else { 873 debug("%sEFI: handle %p\n", indent_string(nesting_level), 874 *handle); 875 } 876 /* Add new protocol */ 877 r = efi_add_protocol(*handle, protocol, protocol_interface); 878 out: 879 return EFI_EXIT(r); 880 } 881 882 /* 883 * Reinstall protocol interface. 884 * 885 * This function implements the ReinstallProtocolInterface service. 886 * See the Unified Extensible Firmware Interface (UEFI) specification 887 * for details. 888 * 889 * @handle handle on which the protocol shall be 890 * reinstalled 891 * @protocol GUID of the protocol to be installed 892 * @old_interface interface to be removed 893 * @new_interface interface to be installed 894 * @return status code 895 */ 896 static efi_status_t EFIAPI efi_reinstall_protocol_interface(void *handle, 897 const efi_guid_t *protocol, void *old_interface, 898 void *new_interface) 899 { 900 EFI_ENTRY("%p, %pUl, %p, %p", handle, protocol, old_interface, 901 new_interface); 902 return EFI_EXIT(EFI_ACCESS_DENIED); 903 } 904 905 /* 906 * Uninstall protocol interface. 907 * 908 * This function implements the UninstallProtocolInterface service. 909 * See the Unified Extensible Firmware Interface (UEFI) specification 910 * for details. 911 * 912 * @handle handle from which the protocol shall be removed 913 * @protocol GUID of the protocol to be removed 914 * @protocol_interface interface to be removed 915 * @return status code 916 */ 917 static efi_status_t EFIAPI efi_uninstall_protocol_interface( 918 void *handle, const efi_guid_t *protocol, 919 void *protocol_interface) 920 { 921 struct efi_handler *handler; 922 efi_status_t r; 923 924 EFI_ENTRY("%p, %pUl, %p", handle, protocol, protocol_interface); 925 926 if (!handle || !protocol) { 927 r = EFI_INVALID_PARAMETER; 928 goto out; 929 } 930 931 /* Find the protocol on the handle */ 932 r = efi_search_protocol(handle, protocol, &handler); 933 if (r != EFI_SUCCESS) 934 goto out; 935 if (handler->protocol_interface) { 936 /* TODO disconnect controllers */ 937 r = EFI_ACCESS_DENIED; 938 } else { 939 r = efi_remove_protocol(handle, protocol, protocol_interface); 940 } 941 out: 942 return EFI_EXIT(r); 943 } 944 945 /* 946 * Register an event for notification when a protocol is installed. 947 * 948 * This function implements the RegisterProtocolNotify service. 949 * See the Unified Extensible Firmware Interface (UEFI) specification 950 * for details. 951 * 952 * @protocol GUID of the protocol whose installation shall be 953 * notified 954 * @event event to be signaled upon installation of the protocol 955 * @registration key for retrieving the registration information 956 * @return status code 957 */ 958 static efi_status_t EFIAPI efi_register_protocol_notify( 959 const efi_guid_t *protocol, 960 struct efi_event *event, 961 void **registration) 962 { 963 EFI_ENTRY("%pUl, %p, %p", protocol, event, registration); 964 return EFI_EXIT(EFI_OUT_OF_RESOURCES); 965 } 966 967 /* 968 * Determine if an EFI handle implements a protocol. 969 * 970 * See the documentation of the LocateHandle service in the UEFI specification. 971 * 972 * @search_type selection criterion 973 * @protocol GUID of the protocol 974 * @search_key registration key 975 * @efiobj handle 976 * @return 0 if the handle implements the protocol 977 */ 978 static int efi_search(enum efi_locate_search_type search_type, 979 const efi_guid_t *protocol, void *search_key, 980 struct efi_object *efiobj) 981 { 982 efi_status_t ret; 983 984 switch (search_type) { 985 case ALL_HANDLES: 986 return 0; 987 case BY_REGISTER_NOTIFY: 988 /* TODO: RegisterProtocolNotify is not implemented yet */ 989 return -1; 990 case BY_PROTOCOL: 991 ret = efi_search_protocol(efiobj->handle, protocol, NULL); 992 return (ret != EFI_SUCCESS); 993 default: 994 /* Invalid search type */ 995 return -1; 996 } 997 } 998 999 /* 1000 * Locate handles implementing a protocol. 1001 * 1002 * This function is meant for U-Boot internal calls. For the API implementation 1003 * of the LocateHandle service see efi_locate_handle_ext. 1004 * 1005 * @search_type selection criterion 1006 * @protocol GUID of the protocol 1007 * @search_key registration key 1008 * @buffer_size size of the buffer to receive the handles in bytes 1009 * @buffer buffer to receive the relevant handles 1010 * @return status code 1011 */ 1012 static efi_status_t efi_locate_handle( 1013 enum efi_locate_search_type search_type, 1014 const efi_guid_t *protocol, void *search_key, 1015 efi_uintn_t *buffer_size, efi_handle_t *buffer) 1016 { 1017 struct efi_object *efiobj; 1018 efi_uintn_t size = 0; 1019 1020 /* Check parameters */ 1021 switch (search_type) { 1022 case ALL_HANDLES: 1023 break; 1024 case BY_REGISTER_NOTIFY: 1025 if (!search_key) 1026 return EFI_INVALID_PARAMETER; 1027 /* RegisterProtocolNotify is not implemented yet */ 1028 return EFI_UNSUPPORTED; 1029 case BY_PROTOCOL: 1030 if (!protocol) 1031 return EFI_INVALID_PARAMETER; 1032 break; 1033 default: 1034 return EFI_INVALID_PARAMETER; 1035 } 1036 1037 /* 1038 * efi_locate_handle_buffer uses this function for 1039 * the calculation of the necessary buffer size. 1040 * So do not require a buffer for buffersize == 0. 1041 */ 1042 if (!buffer_size || (*buffer_size && !buffer)) 1043 return EFI_INVALID_PARAMETER; 1044 1045 /* Count how much space we need */ 1046 list_for_each_entry(efiobj, &efi_obj_list, link) { 1047 if (!efi_search(search_type, protocol, search_key, efiobj)) 1048 size += sizeof(void*); 1049 } 1050 1051 if (*buffer_size < size) { 1052 *buffer_size = size; 1053 return EFI_BUFFER_TOO_SMALL; 1054 } 1055 1056 *buffer_size = size; 1057 if (size == 0) 1058 return EFI_NOT_FOUND; 1059 1060 /* Then fill the array */ 1061 list_for_each_entry(efiobj, &efi_obj_list, link) { 1062 if (!efi_search(search_type, protocol, search_key, efiobj)) 1063 *buffer++ = efiobj->handle; 1064 } 1065 1066 return EFI_SUCCESS; 1067 } 1068 1069 /* 1070 * Locate handles implementing a protocol. 1071 * 1072 * This function implements the LocateHandle service. 1073 * See the Unified Extensible Firmware Interface (UEFI) specification 1074 * for details. 1075 * 1076 * @search_type selection criterion 1077 * @protocol GUID of the protocol 1078 * @search_key registration key 1079 * @buffer_size size of the buffer to receive the handles in bytes 1080 * @buffer buffer to receive the relevant handles 1081 * @return 0 if the handle implements the protocol 1082 */ 1083 static efi_status_t EFIAPI efi_locate_handle_ext( 1084 enum efi_locate_search_type search_type, 1085 const efi_guid_t *protocol, void *search_key, 1086 efi_uintn_t *buffer_size, efi_handle_t *buffer) 1087 { 1088 EFI_ENTRY("%d, %pUl, %p, %p, %p", search_type, protocol, search_key, 1089 buffer_size, buffer); 1090 1091 return EFI_EXIT(efi_locate_handle(search_type, protocol, search_key, 1092 buffer_size, buffer)); 1093 } 1094 1095 /* Collapses configuration table entries, removing index i */ 1096 static void efi_remove_configuration_table(int i) 1097 { 1098 struct efi_configuration_table *this = &efi_conf_table[i]; 1099 struct efi_configuration_table *next = &efi_conf_table[i+1]; 1100 struct efi_configuration_table *end = &efi_conf_table[systab.nr_tables]; 1101 1102 memmove(this, next, (ulong)end - (ulong)next); 1103 systab.nr_tables--; 1104 } 1105 1106 /* 1107 * Adds, updates, or removes a configuration table. 1108 * 1109 * This function is used for internal calls. For the API implementation of the 1110 * InstallConfigurationTable service see efi_install_configuration_table_ext. 1111 * 1112 * @guid GUID of the installed table 1113 * @table table to be installed 1114 * @return status code 1115 */ 1116 efi_status_t efi_install_configuration_table(const efi_guid_t *guid, void *table) 1117 { 1118 int i; 1119 1120 /* Check for guid override */ 1121 for (i = 0; i < systab.nr_tables; i++) { 1122 if (!guidcmp(guid, &efi_conf_table[i].guid)) { 1123 if (table) 1124 efi_conf_table[i].table = table; 1125 else 1126 efi_remove_configuration_table(i); 1127 return EFI_SUCCESS; 1128 } 1129 } 1130 1131 if (!table) 1132 return EFI_NOT_FOUND; 1133 1134 /* No override, check for overflow */ 1135 if (i >= ARRAY_SIZE(efi_conf_table)) 1136 return EFI_OUT_OF_RESOURCES; 1137 1138 /* Add a new entry */ 1139 memcpy(&efi_conf_table[i].guid, guid, sizeof(*guid)); 1140 efi_conf_table[i].table = table; 1141 systab.nr_tables = i + 1; 1142 1143 return EFI_SUCCESS; 1144 } 1145 1146 /* 1147 * Adds, updates, or removes a configuration table. 1148 * 1149 * This function implements the InstallConfigurationTable service. 1150 * See the Unified Extensible Firmware Interface (UEFI) specification 1151 * for details. 1152 * 1153 * @guid GUID of the installed table 1154 * @table table to be installed 1155 * @return status code 1156 */ 1157 static efi_status_t EFIAPI efi_install_configuration_table_ext(efi_guid_t *guid, 1158 void *table) 1159 { 1160 EFI_ENTRY("%pUl, %p", guid, table); 1161 return EFI_EXIT(efi_install_configuration_table(guid, table)); 1162 } 1163 1164 /* 1165 * Initialize a loaded_image_info + loaded_image_info object with correct 1166 * protocols, boot-device, etc. 1167 * 1168 * @info loaded image info to be passed to the entry point of the 1169 * image 1170 * @obj internal object associated with the loaded image 1171 * @device_path device path of the loaded image 1172 * @file_path file path of the loaded image 1173 */ 1174 void efi_setup_loaded_image(struct efi_loaded_image *info, struct efi_object *obj, 1175 struct efi_device_path *device_path, 1176 struct efi_device_path *file_path) 1177 { 1178 efi_status_t ret; 1179 1180 /* Add internal object to object list */ 1181 efi_add_handle(obj); 1182 /* efi_exit() assumes that the handle points to the info */ 1183 obj->handle = info; 1184 1185 info->file_path = file_path; 1186 if (device_path) 1187 info->device_handle = efi_dp_find_obj(device_path, NULL); 1188 1189 /* 1190 * When asking for the device path interface, return 1191 * bootefi_device_path 1192 */ 1193 ret = efi_add_protocol(obj->handle, &efi_guid_device_path, device_path); 1194 if (ret != EFI_SUCCESS) 1195 goto failure; 1196 1197 /* 1198 * When asking for the loaded_image interface, just 1199 * return handle which points to loaded_image_info 1200 */ 1201 ret = efi_add_protocol(obj->handle, &efi_guid_loaded_image, info); 1202 if (ret != EFI_SUCCESS) 1203 goto failure; 1204 1205 ret = efi_add_protocol(obj->handle, &efi_guid_console_control, 1206 (void *)&efi_console_control); 1207 if (ret != EFI_SUCCESS) 1208 goto failure; 1209 1210 ret = efi_add_protocol(obj->handle, 1211 &efi_guid_device_path_to_text_protocol, 1212 (void *)&efi_device_path_to_text); 1213 if (ret != EFI_SUCCESS) 1214 goto failure; 1215 1216 return; 1217 failure: 1218 printf("ERROR: Failure to install protocols for loaded image\n"); 1219 } 1220 1221 /* 1222 * Load an image using a file path. 1223 * 1224 * @file_path the path of the image to load 1225 * @buffer buffer containing the loaded image 1226 * @return status code 1227 */ 1228 efi_status_t efi_load_image_from_path(struct efi_device_path *file_path, 1229 void **buffer) 1230 { 1231 struct efi_file_info *info = NULL; 1232 struct efi_file_handle *f; 1233 static efi_status_t ret; 1234 uint64_t bs; 1235 1236 f = efi_file_from_path(file_path); 1237 if (!f) 1238 return EFI_DEVICE_ERROR; 1239 1240 bs = 0; 1241 EFI_CALL(ret = f->getinfo(f, (efi_guid_t *)&efi_file_info_guid, 1242 &bs, info)); 1243 if (ret == EFI_BUFFER_TOO_SMALL) { 1244 info = malloc(bs); 1245 EFI_CALL(ret = f->getinfo(f, (efi_guid_t *)&efi_file_info_guid, 1246 &bs, info)); 1247 } 1248 if (ret != EFI_SUCCESS) 1249 goto error; 1250 1251 ret = efi_allocate_pool(EFI_LOADER_DATA, info->file_size, buffer); 1252 if (ret) 1253 goto error; 1254 1255 EFI_CALL(ret = f->read(f, &info->file_size, *buffer)); 1256 1257 error: 1258 free(info); 1259 EFI_CALL(f->close(f)); 1260 1261 if (ret != EFI_SUCCESS) { 1262 efi_free_pool(*buffer); 1263 *buffer = NULL; 1264 } 1265 1266 return ret; 1267 } 1268 1269 /* 1270 * Load an EFI image into memory. 1271 * 1272 * This function implements the LoadImage service. 1273 * See the Unified Extensible Firmware Interface (UEFI) specification 1274 * for details. 1275 * 1276 * @boot_policy true for request originating from the boot manager 1277 * @parent_image the calles's image handle 1278 * @file_path the path of the image to load 1279 * @source_buffer memory location from which the image is installed 1280 * @source_size size of the memory area from which the image is 1281 * installed 1282 * @image_handle handle for the newly installed image 1283 * @return status code 1284 */ 1285 static efi_status_t EFIAPI efi_load_image(bool boot_policy, 1286 efi_handle_t parent_image, 1287 struct efi_device_path *file_path, 1288 void *source_buffer, 1289 unsigned long source_size, 1290 efi_handle_t *image_handle) 1291 { 1292 struct efi_loaded_image *info; 1293 struct efi_object *obj; 1294 1295 EFI_ENTRY("%d, %p, %p, %p, %ld, %p", boot_policy, parent_image, 1296 file_path, source_buffer, source_size, image_handle); 1297 1298 info = calloc(1, sizeof(*info)); 1299 obj = calloc(1, sizeof(*obj)); 1300 1301 if (!source_buffer) { 1302 struct efi_device_path *dp, *fp; 1303 efi_status_t ret; 1304 1305 ret = efi_load_image_from_path(file_path, &source_buffer); 1306 if (ret != EFI_SUCCESS) { 1307 free(info); 1308 free(obj); 1309 return EFI_EXIT(ret); 1310 } 1311 1312 /* 1313 * split file_path which contains both the device and 1314 * file parts: 1315 */ 1316 efi_dp_split_file_path(file_path, &dp, &fp); 1317 1318 efi_setup_loaded_image(info, obj, dp, fp); 1319 } else { 1320 /* In this case, file_path is the "device" path, ie. 1321 * something like a HARDWARE_DEVICE:MEMORY_MAPPED 1322 */ 1323 efi_setup_loaded_image(info, obj, file_path, NULL); 1324 } 1325 1326 info->reserved = efi_load_pe(source_buffer, info); 1327 if (!info->reserved) { 1328 free(info); 1329 free(obj); 1330 return EFI_EXIT(EFI_UNSUPPORTED); 1331 } 1332 1333 info->system_table = &systab; 1334 info->parent_handle = parent_image; 1335 *image_handle = obj->handle; 1336 1337 return EFI_EXIT(EFI_SUCCESS); 1338 } 1339 1340 /* 1341 * Call the entry point of an image. 1342 * 1343 * This function implements the StartImage service. 1344 * See the Unified Extensible Firmware Interface (UEFI) specification 1345 * for details. 1346 * 1347 * @image_handle handle of the image 1348 * @exit_data_size size of the buffer 1349 * @exit_data buffer to receive the exit data of the called image 1350 * @return status code 1351 */ 1352 static efi_status_t EFIAPI efi_start_image(efi_handle_t image_handle, 1353 unsigned long *exit_data_size, 1354 s16 **exit_data) 1355 { 1356 ulong (*entry)(void *image_handle, struct efi_system_table *st); 1357 struct efi_loaded_image *info = image_handle; 1358 1359 EFI_ENTRY("%p, %p, %p", image_handle, exit_data_size, exit_data); 1360 entry = info->reserved; 1361 1362 efi_is_direct_boot = false; 1363 1364 /* call the image! */ 1365 if (setjmp(&info->exit_jmp)) { 1366 /* We returned from the child image */ 1367 return EFI_EXIT(info->exit_status); 1368 } 1369 1370 __efi_nesting_dec(); 1371 __efi_exit_check(); 1372 entry(image_handle, &systab); 1373 __efi_entry_check(); 1374 __efi_nesting_inc(); 1375 1376 /* Should usually never get here */ 1377 return EFI_EXIT(EFI_SUCCESS); 1378 } 1379 1380 /* 1381 * Leave an EFI application or driver. 1382 * 1383 * This function implements the Exit service. 1384 * See the Unified Extensible Firmware Interface (UEFI) specification 1385 * for details. 1386 * 1387 * @image_handle handle of the application or driver that is exiting 1388 * @exit_status status code 1389 * @exit_data_size size of the buffer in bytes 1390 * @exit_data buffer with data describing an error 1391 * @return status code 1392 */ 1393 static efi_status_t EFIAPI efi_exit(efi_handle_t image_handle, 1394 efi_status_t exit_status, unsigned long exit_data_size, 1395 int16_t *exit_data) 1396 { 1397 /* 1398 * We require that the handle points to the original loaded 1399 * image protocol interface. 1400 * 1401 * For getting the longjmp address this is safer than locating 1402 * the protocol because the protocol may have been reinstalled 1403 * pointing to another memory location. 1404 * 1405 * TODO: We should call the unload procedure of the loaded 1406 * image protocol. 1407 */ 1408 struct efi_loaded_image *loaded_image_info = (void*)image_handle; 1409 1410 EFI_ENTRY("%p, %ld, %ld, %p", image_handle, exit_status, 1411 exit_data_size, exit_data); 1412 1413 /* Make sure entry/exit counts for EFI world cross-overs match */ 1414 __efi_exit_check(); 1415 1416 /* 1417 * But longjmp out with the U-Boot gd, not the application's, as 1418 * the other end is a setjmp call inside EFI context. 1419 */ 1420 efi_restore_gd(); 1421 1422 loaded_image_info->exit_status = exit_status; 1423 longjmp(&loaded_image_info->exit_jmp, 1); 1424 1425 panic("EFI application exited"); 1426 } 1427 1428 /* 1429 * Unload an EFI image. 1430 * 1431 * This function implements the UnloadImage service. 1432 * See the Unified Extensible Firmware Interface (UEFI) specification 1433 * for details. 1434 * 1435 * @image_handle handle of the image to be unloaded 1436 * @return status code 1437 */ 1438 static efi_status_t EFIAPI efi_unload_image(void *image_handle) 1439 { 1440 struct efi_object *efiobj; 1441 1442 EFI_ENTRY("%p", image_handle); 1443 efiobj = efi_search_obj(image_handle); 1444 if (efiobj) 1445 list_del(&efiobj->link); 1446 1447 return EFI_EXIT(EFI_SUCCESS); 1448 } 1449 1450 /* 1451 * Fix up caches for EFI payloads if necessary. 1452 */ 1453 static void efi_exit_caches(void) 1454 { 1455 #if defined(CONFIG_ARM) && !defined(CONFIG_ARM64) 1456 /* 1457 * Grub on 32bit ARM needs to have caches disabled before jumping into 1458 * a zImage, but does not know of all cache layers. Give it a hand. 1459 */ 1460 if (efi_is_direct_boot) 1461 cleanup_before_linux(); 1462 #endif 1463 } 1464 1465 /* 1466 * Stop boot services. 1467 * 1468 * This function implements the ExitBootServices service. 1469 * See the Unified Extensible Firmware Interface (UEFI) specification 1470 * for details. 1471 * 1472 * @image_handle handle of the loaded image 1473 * @map_key key of the memory map 1474 * @return status code 1475 */ 1476 static efi_status_t EFIAPI efi_exit_boot_services(void *image_handle, 1477 unsigned long map_key) 1478 { 1479 int i; 1480 1481 EFI_ENTRY("%p, %ld", image_handle, map_key); 1482 1483 /* Notify that ExitBootServices is invoked. */ 1484 for (i = 0; i < ARRAY_SIZE(efi_events); ++i) { 1485 if (efi_events[i].type != EVT_SIGNAL_EXIT_BOOT_SERVICES) 1486 continue; 1487 efi_signal_event(&efi_events[i]); 1488 } 1489 /* Make sure that notification functions are not called anymore */ 1490 efi_tpl = TPL_HIGH_LEVEL; 1491 1492 /* XXX Should persist EFI variables here */ 1493 1494 board_quiesce_devices(); 1495 1496 /* Fix up caches for EFI payloads if necessary */ 1497 efi_exit_caches(); 1498 1499 /* This stops all lingering devices */ 1500 bootm_disable_interrupts(); 1501 1502 /* Give the payload some time to boot */ 1503 efi_set_watchdog(0); 1504 WATCHDOG_RESET(); 1505 1506 return EFI_EXIT(EFI_SUCCESS); 1507 } 1508 1509 /* 1510 * Get next value of the counter. 1511 * 1512 * This function implements the NextMonotonicCount service. 1513 * See the Unified Extensible Firmware Interface (UEFI) specification 1514 * for details. 1515 * 1516 * @count returned value of the counter 1517 * @return status code 1518 */ 1519 static efi_status_t EFIAPI efi_get_next_monotonic_count(uint64_t *count) 1520 { 1521 static uint64_t mono = 0; 1522 EFI_ENTRY("%p", count); 1523 *count = mono++; 1524 return EFI_EXIT(EFI_SUCCESS); 1525 } 1526 1527 /* 1528 * Sleep. 1529 * 1530 * This function implements the Stall sercive. 1531 * See the Unified Extensible Firmware Interface (UEFI) specification 1532 * for details. 1533 * 1534 * @microseconds period to sleep in microseconds 1535 * @return status code 1536 */ 1537 static efi_status_t EFIAPI efi_stall(unsigned long microseconds) 1538 { 1539 EFI_ENTRY("%ld", microseconds); 1540 udelay(microseconds); 1541 return EFI_EXIT(EFI_SUCCESS); 1542 } 1543 1544 /* 1545 * Reset the watchdog timer. 1546 * 1547 * This function implements the SetWatchdogTimer service. 1548 * See the Unified Extensible Firmware Interface (UEFI) specification 1549 * for details. 1550 * 1551 * @timeout seconds before reset by watchdog 1552 * @watchdog_code code to be logged when resetting 1553 * @data_size size of buffer in bytes 1554 * @watchdog_data buffer with data describing the reset reason 1555 * @return status code 1556 */ 1557 static efi_status_t EFIAPI efi_set_watchdog_timer(unsigned long timeout, 1558 uint64_t watchdog_code, 1559 unsigned long data_size, 1560 uint16_t *watchdog_data) 1561 { 1562 EFI_ENTRY("%ld, 0x%"PRIx64", %ld, %p", timeout, watchdog_code, 1563 data_size, watchdog_data); 1564 return EFI_EXIT(efi_set_watchdog(timeout)); 1565 } 1566 1567 /* 1568 * Connect a controller to a driver. 1569 * 1570 * This function implements the ConnectController service. 1571 * See the Unified Extensible Firmware Interface (UEFI) specification 1572 * for details. 1573 * 1574 * @controller_handle handle of the controller 1575 * @driver_image_handle handle of the driver 1576 * @remain_device_path device path of a child controller 1577 * @recursive true to connect all child controllers 1578 * @return status code 1579 */ 1580 static efi_status_t EFIAPI efi_connect_controller( 1581 efi_handle_t controller_handle, 1582 efi_handle_t *driver_image_handle, 1583 struct efi_device_path *remain_device_path, 1584 bool recursive) 1585 { 1586 EFI_ENTRY("%p, %p, %p, %d", controller_handle, driver_image_handle, 1587 remain_device_path, recursive); 1588 return EFI_EXIT(EFI_NOT_FOUND); 1589 } 1590 1591 /* 1592 * Disconnect a controller from a driver. 1593 * 1594 * This function implements the DisconnectController service. 1595 * See the Unified Extensible Firmware Interface (UEFI) specification 1596 * for details. 1597 * 1598 * @controller_handle handle of the controller 1599 * @driver_image_handle handle of the driver 1600 * @child_handle handle of the child to destroy 1601 * @return status code 1602 */ 1603 static efi_status_t EFIAPI efi_disconnect_controller(void *controller_handle, 1604 void *driver_image_handle, 1605 void *child_handle) 1606 { 1607 EFI_ENTRY("%p, %p, %p", controller_handle, driver_image_handle, 1608 child_handle); 1609 return EFI_EXIT(EFI_INVALID_PARAMETER); 1610 } 1611 1612 /* 1613 * Close a protocol. 1614 * 1615 * This function implements the CloseProtocol service. 1616 * See the Unified Extensible Firmware Interface (UEFI) specification 1617 * for details. 1618 * 1619 * @handle handle on which the protocol shall be closed 1620 * @protocol GUID of the protocol to close 1621 * @agent_handle handle of the driver 1622 * @controller_handle handle of the controller 1623 * @return status code 1624 */ 1625 static efi_status_t EFIAPI efi_close_protocol(void *handle, 1626 const efi_guid_t *protocol, 1627 void *agent_handle, 1628 void *controller_handle) 1629 { 1630 EFI_ENTRY("%p, %pUl, %p, %p", handle, protocol, agent_handle, 1631 controller_handle); 1632 return EFI_EXIT(EFI_NOT_FOUND); 1633 } 1634 1635 /* 1636 * Provide information about then open status of a protocol on a handle 1637 * 1638 * This function implements the OpenProtocolInformation service. 1639 * See the Unified Extensible Firmware Interface (UEFI) specification 1640 * for details. 1641 * 1642 * @handle handle for which the information shall be retrieved 1643 * @protocol GUID of the protocol 1644 * @entry_buffer buffer to receive the open protocol information 1645 * @entry_count number of entries available in the buffer 1646 * @return status code 1647 */ 1648 static efi_status_t EFIAPI efi_open_protocol_information(efi_handle_t handle, 1649 const efi_guid_t *protocol, 1650 struct efi_open_protocol_info_entry **entry_buffer, 1651 efi_uintn_t *entry_count) 1652 { 1653 EFI_ENTRY("%p, %pUl, %p, %p", handle, protocol, entry_buffer, 1654 entry_count); 1655 return EFI_EXIT(EFI_NOT_FOUND); 1656 } 1657 1658 /* 1659 * Get protocols installed on a handle. 1660 * 1661 * This function implements the ProtocolsPerHandleService. 1662 * See the Unified Extensible Firmware Interface (UEFI) specification 1663 * for details. 1664 * 1665 * @handle handle for which the information is retrieved 1666 * @protocol_buffer buffer with protocol GUIDs 1667 * @protocol_buffer_count number of entries in the buffer 1668 * @return status code 1669 */ 1670 static efi_status_t EFIAPI efi_protocols_per_handle(void *handle, 1671 efi_guid_t ***protocol_buffer, 1672 efi_uintn_t *protocol_buffer_count) 1673 { 1674 unsigned long buffer_size; 1675 struct efi_object *efiobj; 1676 struct list_head *protocol_handle; 1677 efi_status_t r; 1678 1679 EFI_ENTRY("%p, %p, %p", handle, protocol_buffer, 1680 protocol_buffer_count); 1681 1682 if (!handle || !protocol_buffer || !protocol_buffer_count) 1683 return EFI_EXIT(EFI_INVALID_PARAMETER); 1684 1685 *protocol_buffer = NULL; 1686 *protocol_buffer_count = 0; 1687 1688 efiobj = efi_search_obj(handle); 1689 if (!efiobj) 1690 return EFI_EXIT(EFI_INVALID_PARAMETER); 1691 1692 /* Count protocols */ 1693 list_for_each(protocol_handle, &efiobj->protocols) { 1694 ++*protocol_buffer_count; 1695 } 1696 1697 /* Copy guids */ 1698 if (*protocol_buffer_count) { 1699 size_t j = 0; 1700 1701 buffer_size = sizeof(efi_guid_t *) * *protocol_buffer_count; 1702 r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, buffer_size, 1703 (void **)protocol_buffer); 1704 if (r != EFI_SUCCESS) 1705 return EFI_EXIT(r); 1706 list_for_each(protocol_handle, &efiobj->protocols) { 1707 struct efi_handler *protocol; 1708 1709 protocol = list_entry(protocol_handle, 1710 struct efi_handler, link); 1711 (*protocol_buffer)[j] = (void *)protocol->guid; 1712 ++j; 1713 } 1714 } 1715 1716 return EFI_EXIT(EFI_SUCCESS); 1717 } 1718 1719 /* 1720 * Locate handles implementing a protocol. 1721 * 1722 * This function implements the LocateHandleBuffer service. 1723 * See the Unified Extensible Firmware Interface (UEFI) specification 1724 * for details. 1725 * 1726 * @search_type selection criterion 1727 * @protocol GUID of the protocol 1728 * @search_key registration key 1729 * @no_handles number of returned handles 1730 * @buffer buffer with the returned handles 1731 * @return status code 1732 */ 1733 static efi_status_t EFIAPI efi_locate_handle_buffer( 1734 enum efi_locate_search_type search_type, 1735 const efi_guid_t *protocol, void *search_key, 1736 efi_uintn_t *no_handles, efi_handle_t **buffer) 1737 { 1738 efi_status_t r; 1739 efi_uintn_t buffer_size = 0; 1740 1741 EFI_ENTRY("%d, %pUl, %p, %p, %p", search_type, protocol, search_key, 1742 no_handles, buffer); 1743 1744 if (!no_handles || !buffer) { 1745 r = EFI_INVALID_PARAMETER; 1746 goto out; 1747 } 1748 *no_handles = 0; 1749 *buffer = NULL; 1750 r = efi_locate_handle(search_type, protocol, search_key, &buffer_size, 1751 *buffer); 1752 if (r != EFI_BUFFER_TOO_SMALL) 1753 goto out; 1754 r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, buffer_size, 1755 (void **)buffer); 1756 if (r != EFI_SUCCESS) 1757 goto out; 1758 r = efi_locate_handle(search_type, protocol, search_key, &buffer_size, 1759 *buffer); 1760 if (r == EFI_SUCCESS) 1761 *no_handles = buffer_size / sizeof(void *); 1762 out: 1763 return EFI_EXIT(r); 1764 } 1765 1766 /* 1767 * Find an interface implementing a protocol. 1768 * 1769 * This function implements the LocateProtocol service. 1770 * See the Unified Extensible Firmware Interface (UEFI) specification 1771 * for details. 1772 * 1773 * @protocol GUID of the protocol 1774 * @registration registration key passed to the notification function 1775 * @protocol_interface interface implementing the protocol 1776 * @return status code 1777 */ 1778 static efi_status_t EFIAPI efi_locate_protocol(const efi_guid_t *protocol, 1779 void *registration, 1780 void **protocol_interface) 1781 { 1782 struct list_head *lhandle; 1783 efi_status_t ret; 1784 1785 EFI_ENTRY("%pUl, %p, %p", protocol, registration, protocol_interface); 1786 1787 if (!protocol || !protocol_interface) 1788 return EFI_EXIT(EFI_INVALID_PARAMETER); 1789 1790 list_for_each(lhandle, &efi_obj_list) { 1791 struct efi_object *efiobj; 1792 struct efi_handler *handler; 1793 1794 efiobj = list_entry(lhandle, struct efi_object, link); 1795 1796 ret = efi_search_protocol(efiobj->handle, protocol, &handler); 1797 if (ret == EFI_SUCCESS) { 1798 *protocol_interface = handler->protocol_interface; 1799 return EFI_EXIT(EFI_SUCCESS); 1800 } 1801 } 1802 *protocol_interface = NULL; 1803 1804 return EFI_EXIT(EFI_NOT_FOUND); 1805 } 1806 1807 /* 1808 * Get the device path and handle of an device implementing a protocol. 1809 * 1810 * This function implements the LocateDevicePath service. 1811 * See the Unified Extensible Firmware Interface (UEFI) specification 1812 * for details. 1813 * 1814 * @protocol GUID of the protocol 1815 * @device_path device path 1816 * @device handle of the device 1817 * @return status code 1818 */ 1819 static efi_status_t EFIAPI efi_locate_device_path( 1820 const efi_guid_t *protocol, 1821 struct efi_device_path **device_path, 1822 efi_handle_t *device) 1823 { 1824 struct efi_device_path *dp; 1825 size_t i; 1826 struct efi_handler *handler; 1827 efi_handle_t *handles; 1828 size_t len, len_dp; 1829 size_t len_best = 0; 1830 efi_uintn_t no_handles; 1831 u8 *remainder; 1832 efi_status_t ret; 1833 1834 EFI_ENTRY("%pUl, %p, %p", protocol, device_path, device); 1835 1836 if (!protocol || !device_path || !*device_path || !device) { 1837 ret = EFI_INVALID_PARAMETER; 1838 goto out; 1839 } 1840 1841 /* Find end of device path */ 1842 len = efi_dp_size(*device_path); 1843 1844 /* Get all handles implementing the protocol */ 1845 ret = EFI_CALL(efi_locate_handle_buffer(BY_PROTOCOL, protocol, NULL, 1846 &no_handles, &handles)); 1847 if (ret != EFI_SUCCESS) 1848 goto out; 1849 1850 for (i = 0; i < no_handles; ++i) { 1851 /* Find the device path protocol */ 1852 ret = efi_search_protocol(handles[i], &efi_guid_device_path, 1853 &handler); 1854 if (ret != EFI_SUCCESS) 1855 continue; 1856 dp = (struct efi_device_path *)handler->protocol_interface; 1857 len_dp = efi_dp_size(dp); 1858 /* 1859 * This handle can only be a better fit 1860 * if its device path length is longer than the best fit and 1861 * if its device path length is shorter of equal the searched 1862 * device path. 1863 */ 1864 if (len_dp <= len_best || len_dp > len) 1865 continue; 1866 /* Check if dp is a subpath of device_path */ 1867 if (memcmp(*device_path, dp, len_dp)) 1868 continue; 1869 *device = handles[i]; 1870 len_best = len_dp; 1871 } 1872 if (len_best) { 1873 remainder = (u8 *)*device_path + len_best; 1874 *device_path = (struct efi_device_path *)remainder; 1875 ret = EFI_SUCCESS; 1876 } else { 1877 ret = EFI_NOT_FOUND; 1878 } 1879 out: 1880 return EFI_EXIT(ret); 1881 } 1882 1883 /* 1884 * Install multiple protocol interfaces. 1885 * 1886 * This function implements the MultipleProtocolInterfaces service. 1887 * See the Unified Extensible Firmware Interface (UEFI) specification 1888 * for details. 1889 * 1890 * @handle handle on which the protocol interfaces shall be installed 1891 * @... NULL terminated argument list with pairs of protocol GUIDS and 1892 * interfaces 1893 * @return status code 1894 */ 1895 static efi_status_t EFIAPI efi_install_multiple_protocol_interfaces( 1896 void **handle, ...) 1897 { 1898 EFI_ENTRY("%p", handle); 1899 1900 va_list argptr; 1901 const efi_guid_t *protocol; 1902 void *protocol_interface; 1903 efi_status_t r = EFI_SUCCESS; 1904 int i = 0; 1905 1906 if (!handle) 1907 return EFI_EXIT(EFI_INVALID_PARAMETER); 1908 1909 va_start(argptr, handle); 1910 for (;;) { 1911 protocol = va_arg(argptr, efi_guid_t*); 1912 if (!protocol) 1913 break; 1914 protocol_interface = va_arg(argptr, void*); 1915 r = EFI_CALL(efi_install_protocol_interface( 1916 handle, protocol, 1917 EFI_NATIVE_INTERFACE, 1918 protocol_interface)); 1919 if (r != EFI_SUCCESS) 1920 break; 1921 i++; 1922 } 1923 va_end(argptr); 1924 if (r == EFI_SUCCESS) 1925 return EFI_EXIT(r); 1926 1927 /* If an error occurred undo all changes. */ 1928 va_start(argptr, handle); 1929 for (; i; --i) { 1930 protocol = va_arg(argptr, efi_guid_t*); 1931 protocol_interface = va_arg(argptr, void*); 1932 EFI_CALL(efi_uninstall_protocol_interface(handle, protocol, 1933 protocol_interface)); 1934 } 1935 va_end(argptr); 1936 1937 return EFI_EXIT(r); 1938 } 1939 1940 /* 1941 * Uninstall multiple protocol interfaces. 1942 * 1943 * This function implements the UninstallMultipleProtocolInterfaces service. 1944 * See the Unified Extensible Firmware Interface (UEFI) specification 1945 * for details. 1946 * 1947 * @handle handle from which the protocol interfaces shall be removed 1948 * @... NULL terminated argument list with pairs of protocol GUIDS and 1949 * interfaces 1950 * @return status code 1951 */ 1952 static efi_status_t EFIAPI efi_uninstall_multiple_protocol_interfaces( 1953 void *handle, ...) 1954 { 1955 EFI_ENTRY("%p", handle); 1956 1957 va_list argptr; 1958 const efi_guid_t *protocol; 1959 void *protocol_interface; 1960 efi_status_t r = EFI_SUCCESS; 1961 size_t i = 0; 1962 1963 if (!handle) 1964 return EFI_EXIT(EFI_INVALID_PARAMETER); 1965 1966 va_start(argptr, handle); 1967 for (;;) { 1968 protocol = va_arg(argptr, efi_guid_t*); 1969 if (!protocol) 1970 break; 1971 protocol_interface = va_arg(argptr, void*); 1972 r = EFI_CALL(efi_uninstall_protocol_interface( 1973 handle, protocol, 1974 protocol_interface)); 1975 if (r != EFI_SUCCESS) 1976 break; 1977 i++; 1978 } 1979 va_end(argptr); 1980 if (r == EFI_SUCCESS) 1981 return EFI_EXIT(r); 1982 1983 /* If an error occurred undo all changes. */ 1984 va_start(argptr, handle); 1985 for (; i; --i) { 1986 protocol = va_arg(argptr, efi_guid_t*); 1987 protocol_interface = va_arg(argptr, void*); 1988 EFI_CALL(efi_install_protocol_interface(&handle, protocol, 1989 EFI_NATIVE_INTERFACE, 1990 protocol_interface)); 1991 } 1992 va_end(argptr); 1993 1994 return EFI_EXIT(r); 1995 } 1996 1997 /* 1998 * Calculate cyclic redundancy code. 1999 * 2000 * This function implements the CalculateCrc32 service. 2001 * See the Unified Extensible Firmware Interface (UEFI) specification 2002 * for details. 2003 * 2004 * @data buffer with data 2005 * @data_size size of buffer in bytes 2006 * @crc32_p cyclic redundancy code 2007 * @return status code 2008 */ 2009 static efi_status_t EFIAPI efi_calculate_crc32(void *data, 2010 unsigned long data_size, 2011 uint32_t *crc32_p) 2012 { 2013 EFI_ENTRY("%p, %ld", data, data_size); 2014 *crc32_p = crc32(0, data, data_size); 2015 return EFI_EXIT(EFI_SUCCESS); 2016 } 2017 2018 /* 2019 * Copy memory. 2020 * 2021 * This function implements the CopyMem service. 2022 * See the Unified Extensible Firmware Interface (UEFI) specification 2023 * for details. 2024 * 2025 * @destination destination of the copy operation 2026 * @source source of the copy operation 2027 * @length number of bytes to copy 2028 */ 2029 static void EFIAPI efi_copy_mem(void *destination, const void *source, 2030 size_t length) 2031 { 2032 EFI_ENTRY("%p, %p, %ld", destination, source, (unsigned long)length); 2033 memcpy(destination, source, length); 2034 EFI_EXIT(EFI_SUCCESS); 2035 } 2036 2037 /* 2038 * Fill memory with a byte value. 2039 * 2040 * This function implements the SetMem service. 2041 * See the Unified Extensible Firmware Interface (UEFI) specification 2042 * for details. 2043 * 2044 * @buffer buffer to fill 2045 * @size size of buffer in bytes 2046 * @value byte to copy to the buffer 2047 */ 2048 static void EFIAPI efi_set_mem(void *buffer, size_t size, uint8_t value) 2049 { 2050 EFI_ENTRY("%p, %ld, 0x%x", buffer, (unsigned long)size, value); 2051 memset(buffer, value, size); 2052 EFI_EXIT(EFI_SUCCESS); 2053 } 2054 2055 /* 2056 * Open protocol interface on a handle. 2057 * 2058 * This function implements the OpenProtocol interface. 2059 * See the Unified Extensible Firmware Interface (UEFI) specification 2060 * for details. 2061 * 2062 * @handle handle on which the protocol shall be opened 2063 * @protocol GUID of the protocol 2064 * @protocol_interface interface implementing the protocol 2065 * @agent_handle handle of the driver 2066 * @controller_handle handle of the controller 2067 * @attributes attributes indicating how to open the protocol 2068 * @return status code 2069 */ 2070 static efi_status_t EFIAPI efi_open_protocol( 2071 void *handle, const efi_guid_t *protocol, 2072 void **protocol_interface, void *agent_handle, 2073 void *controller_handle, uint32_t attributes) 2074 { 2075 struct efi_handler *handler; 2076 efi_status_t r = EFI_INVALID_PARAMETER; 2077 2078 EFI_ENTRY("%p, %pUl, %p, %p, %p, 0x%x", handle, protocol, 2079 protocol_interface, agent_handle, controller_handle, 2080 attributes); 2081 2082 if (!handle || !protocol || 2083 (!protocol_interface && attributes != 2084 EFI_OPEN_PROTOCOL_TEST_PROTOCOL)) { 2085 goto out; 2086 } 2087 2088 switch (attributes) { 2089 case EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL: 2090 case EFI_OPEN_PROTOCOL_GET_PROTOCOL: 2091 case EFI_OPEN_PROTOCOL_TEST_PROTOCOL: 2092 break; 2093 case EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER: 2094 if (controller_handle == handle) 2095 goto out; 2096 case EFI_OPEN_PROTOCOL_BY_DRIVER: 2097 case EFI_OPEN_PROTOCOL_BY_DRIVER | EFI_OPEN_PROTOCOL_EXCLUSIVE: 2098 if (controller_handle == NULL) 2099 goto out; 2100 case EFI_OPEN_PROTOCOL_EXCLUSIVE: 2101 if (agent_handle == NULL) 2102 goto out; 2103 break; 2104 default: 2105 goto out; 2106 } 2107 2108 r = efi_search_protocol(handle, protocol, &handler); 2109 if (r != EFI_SUCCESS) 2110 goto out; 2111 2112 if (attributes != EFI_OPEN_PROTOCOL_TEST_PROTOCOL) 2113 *protocol_interface = handler->protocol_interface; 2114 out: 2115 return EFI_EXIT(r); 2116 } 2117 2118 /* 2119 * Get interface of a protocol on a handle. 2120 * 2121 * This function implements the HandleProtocol service. 2122 * See the Unified Extensible Firmware Interface (UEFI) specification 2123 * for details. 2124 * 2125 * @handle handle on which the protocol shall be opened 2126 * @protocol GUID of the protocol 2127 * @protocol_interface interface implementing the protocol 2128 * @return status code 2129 */ 2130 static efi_status_t EFIAPI efi_handle_protocol(void *handle, 2131 const efi_guid_t *protocol, 2132 void **protocol_interface) 2133 { 2134 return efi_open_protocol(handle, protocol, protocol_interface, NULL, 2135 NULL, EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL); 2136 } 2137 2138 static const struct efi_boot_services efi_boot_services = { 2139 .hdr = { 2140 .headersize = sizeof(struct efi_table_hdr), 2141 }, 2142 .raise_tpl = efi_raise_tpl, 2143 .restore_tpl = efi_restore_tpl, 2144 .allocate_pages = efi_allocate_pages_ext, 2145 .free_pages = efi_free_pages_ext, 2146 .get_memory_map = efi_get_memory_map_ext, 2147 .allocate_pool = efi_allocate_pool_ext, 2148 .free_pool = efi_free_pool_ext, 2149 .create_event = efi_create_event_ext, 2150 .set_timer = efi_set_timer_ext, 2151 .wait_for_event = efi_wait_for_event, 2152 .signal_event = efi_signal_event_ext, 2153 .close_event = efi_close_event, 2154 .check_event = efi_check_event, 2155 .install_protocol_interface = efi_install_protocol_interface, 2156 .reinstall_protocol_interface = efi_reinstall_protocol_interface, 2157 .uninstall_protocol_interface = efi_uninstall_protocol_interface, 2158 .handle_protocol = efi_handle_protocol, 2159 .reserved = NULL, 2160 .register_protocol_notify = efi_register_protocol_notify, 2161 .locate_handle = efi_locate_handle_ext, 2162 .locate_device_path = efi_locate_device_path, 2163 .install_configuration_table = efi_install_configuration_table_ext, 2164 .load_image = efi_load_image, 2165 .start_image = efi_start_image, 2166 .exit = efi_exit, 2167 .unload_image = efi_unload_image, 2168 .exit_boot_services = efi_exit_boot_services, 2169 .get_next_monotonic_count = efi_get_next_monotonic_count, 2170 .stall = efi_stall, 2171 .set_watchdog_timer = efi_set_watchdog_timer, 2172 .connect_controller = efi_connect_controller, 2173 .disconnect_controller = efi_disconnect_controller, 2174 .open_protocol = efi_open_protocol, 2175 .close_protocol = efi_close_protocol, 2176 .open_protocol_information = efi_open_protocol_information, 2177 .protocols_per_handle = efi_protocols_per_handle, 2178 .locate_handle_buffer = efi_locate_handle_buffer, 2179 .locate_protocol = efi_locate_protocol, 2180 .install_multiple_protocol_interfaces = efi_install_multiple_protocol_interfaces, 2181 .uninstall_multiple_protocol_interfaces = efi_uninstall_multiple_protocol_interfaces, 2182 .calculate_crc32 = efi_calculate_crc32, 2183 .copy_mem = efi_copy_mem, 2184 .set_mem = efi_set_mem, 2185 }; 2186 2187 2188 static uint16_t __efi_runtime_data firmware_vendor[] = 2189 { 'D','a','s',' ','U','-','b','o','o','t',0 }; 2190 2191 struct efi_system_table __efi_runtime_data systab = { 2192 .hdr = { 2193 .signature = EFI_SYSTEM_TABLE_SIGNATURE, 2194 .revision = 0x20005, /* 2.5 */ 2195 .headersize = sizeof(struct efi_table_hdr), 2196 }, 2197 .fw_vendor = (long)firmware_vendor, 2198 .con_in = (void*)&efi_con_in, 2199 .con_out = (void*)&efi_con_out, 2200 .std_err = (void*)&efi_con_out, 2201 .runtime = (void*)&efi_runtime_services, 2202 .boottime = (void*)&efi_boot_services, 2203 .nr_tables = 0, 2204 .tables = (void*)efi_conf_table, 2205 }; 2206