lib/efi_loader/efi_boottime.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  *  EFI application boot time services
   4  *
   5  *  Copyright (c) 2016 Alexander Graf
   6  */
   7
   8 #include <common.h>
   9 #include <div64.h>
  10 #include <efi_loader.h>
  11 #include <environment.h>
  12 #include <malloc.h>
  13 #include <linux/libfdt_env.h>
  14 #include <u-boot/crc.h>
  15 #include <bootm.h>
  16 #include <watchdog.h>
  17
  18 DECLARE_GLOBAL_DATA_PTR;
  19
  20 /* Task priority level */
  21 static efi_uintn_t efi_tpl = TPL_APPLICATION;
  22
  23 /* This list contains all the EFI objects our payload has access to */
  24 LIST_HEAD(efi_obj_list);
  25
  26 /* List of all events */
  27 LIST_HEAD(efi_events);
  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 #ifdef CONFIG_ARM
  38 /*
  39  * The "gd" pointer lives in a register on ARM and AArch64 that we declare
  40  * fixed when compiling U-Boot. However, the payload does not know about that
  41  * restriction so we need to manually swap its and our view of that register on
  42  * EFI callback entry/exit.
  43  */
  44 static volatile void *efi_gd, *app_gd;
  45 #endif
  46
  47 static int entry_count;
  48 static int nesting_level;
  49 /* GUID of the device tree table */
  50 const efi_guid_t efi_guid_fdt = EFI_FDT_GUID;
  51 /* GUID of the EFI_DRIVER_BINDING_PROTOCOL */
  52 const efi_guid_t efi_guid_driver_binding_protocol =
  53                         EFI_DRIVER_BINDING_PROTOCOL_GUID;
  54
  55 /* event group ExitBootServices() invoked */
  56 const efi_guid_t efi_guid_event_group_exit_boot_services =
  57                         EFI_EVENT_GROUP_EXIT_BOOT_SERVICES;
  58 /* event group SetVirtualAddressMap() invoked */
  59 const efi_guid_t efi_guid_event_group_virtual_address_change =
  60                         EFI_EVENT_GROUP_VIRTUAL_ADDRESS_CHANGE;
  61 /* event group memory map changed */
  62 const efi_guid_t efi_guid_event_group_memory_map_change =
  63                         EFI_EVENT_GROUP_MEMORY_MAP_CHANGE;
  64 /* event group boot manager about to boot */
  65 const efi_guid_t efi_guid_event_group_ready_to_boot =
  66                         EFI_EVENT_GROUP_READY_TO_BOOT;
  67 /* event group ResetSystem() invoked (before ExitBootServices) */
  68 const efi_guid_t efi_guid_event_group_reset_system =
  69                         EFI_EVENT_GROUP_RESET_SYSTEM;
  70
  71 static efi_status_t EFIAPI efi_disconnect_controller(
  72                                         efi_handle_t controller_handle,
  73                                         efi_handle_t driver_image_handle,
  74                                         efi_handle_t child_handle);
  75
  76 /* Called on every callback entry */
  77 int __efi_entry_check(void)
  78 {
  79         int ret = entry_count++ == 0;
  80 #ifdef CONFIG_ARM
  81         assert(efi_gd);
  82         app_gd = gd;
  83         gd = efi_gd;
  84 #endif
  85         return ret;
  86 }
  87
  88 /* Called on every callback exit */
  89 int __efi_exit_check(void)
  90 {
  91         int ret = --entry_count == 0;
  92 #ifdef CONFIG_ARM
  93         gd = app_gd;
  94 #endif
  95         return ret;
  96 }
  97
  98 /* Called from do_bootefi_exec() */
  99 void efi_save_gd(void)
 100 {
 101 #ifdef CONFIG_ARM
 102         efi_gd = gd;
 103 #endif
 104 }
 105
 106 /*
 107  * Special case handler for error/abort that just forces things back to u-boot
 108  * world so we can dump out an abort msg, without any care about returning back
 109  * to UEFI world.
 110  */
 111 void efi_restore_gd(void)
 112 {
 113 #ifdef CONFIG_ARM
 114         /* Only restore if we're already in EFI context */
 115         if (!efi_gd)
 116                 return;
 117         gd = efi_gd;
 118 #endif
 119 }
 120
 121 /**
 122  * indent_string() - returns a string for indenting with two spaces per level
 123  * @level: indent level
 124  *
 125  * A maximum of ten indent levels is supported. Higher indent levels will be
 126  * truncated.
 127  *
 128  * Return: A string for indenting with two spaces per level is
 129  *         returned.
 130  */
 131 static const char *indent_string(int level)
 132 {
 133         const char *indent = "                    ";
 134         const int max = strlen(indent);
 135
 136         level = min(max, level * 2);
 137         return &indent[max - level];
 138 }
 139
 140 const char *__efi_nesting(void)
 141 {
 142         return indent_string(nesting_level);
 143 }
 144
 145 const char *__efi_nesting_inc(void)
 146 {
 147         return indent_string(nesting_level++);
 148 }
 149
 150 const char *__efi_nesting_dec(void)
 151 {
 152         return indent_string(--nesting_level);
 153 }
 154
 155 /**
 156  * efi_queue_event() - queue an EFI event
 157  * @event:     event to signal
 158  * @check_tpl: check the TPL level
 159  *
 160  * This function queues the notification function of the event for future
 161  * execution.
 162  *
 163  * The notification function is called if the task priority level of the event
 164  * is higher than the current task priority level.
 165  *
 166  * For the SignalEvent service see efi_signal_event_ext.
 167  *
 168  */
 169 static void efi_queue_event(struct efi_event *event, bool check_tpl)
 170 {
 171         if (event->notify_function) {
 172                 event->is_queued = true;
 173                 /* Check TPL */
 174                 if (check_tpl && efi_tpl >= event->notify_tpl)
 175                         return;
 176                 EFI_CALL_VOID(event->notify_function(event,
 177                                                      event->notify_context));
 178         }
 179         event->is_queued = false;
 180 }
 181
 182 /**
 183  * is_valid_tpl() - check if the task priority level is valid
 184  *
 185  * @tpl:                TPL level to check
 186  * ReturnValue:         status code
 187  */
 188 efi_status_t is_valid_tpl(efi_uintn_t tpl)
 189 {
 190         switch (tpl) {
 191         case TPL_APPLICATION:
 192         case TPL_CALLBACK:
 193         case TPL_NOTIFY:
 194         case TPL_HIGH_LEVEL:
 195                 return EFI_SUCCESS;
 196         default:
 197                 return EFI_INVALID_PARAMETER;
 198         }
 199 }
 200
 201 /**
 202  * efi_signal_event() - signal an EFI event
 203  * @event:     event to signal
 204  * @check_tpl: check the TPL level
 205  *
 206  * This function signals an event. If the event belongs to an event group all
 207  * events of the group are signaled. If they are of type EVT_NOTIFY_SIGNAL
 208  * their notification function is queued.
 209  *
 210  * For the SignalEvent service see efi_signal_event_ext.
 211  */
 212 void efi_signal_event(struct efi_event *event, bool check_tpl)
 213 {
 214         if (event->group) {
 215                 struct efi_event *evt;
 216
 217                 /*
 218                  * The signaled state has to set before executing any
 219                  * notification function
 220                  */
 221                 list_for_each_entry(evt, &efi_events, link) {
 222                         if (!evt->group || guidcmp(evt->group, event->group))
 223                                 continue;
 224                         if (evt->is_signaled)
 225                                 continue;
 226                         evt->is_signaled = true;
 227                         if (evt->type & EVT_NOTIFY_SIGNAL &&
 228                             evt->notify_function)
 229                                 evt->is_queued = true;
 230                 }
 231                 list_for_each_entry(evt, &efi_events, link) {
 232                         if (!evt->group || guidcmp(evt->group, event->group))
 233                                 continue;
 234                         if (evt->is_queued)
 235                                 efi_queue_event(evt, check_tpl);
 236                 }
 237         } else if (!event->is_signaled) {
 238                 event->is_signaled = true;
 239                 if (event->type & EVT_NOTIFY_SIGNAL)
 240                         efi_queue_event(event, check_tpl);
 241         }
 242 }
 243
 244 /**
 245  * efi_raise_tpl() - raise the task priority level
 246  * @new_tpl: new value of the task priority level
 247  *
 248  * This function implements the RaiseTpl service.
 249  *
 250  * See the Unified Extensible Firmware Interface (UEFI) specification for
 251  * details.
 252  *
 253  * Return: old value of the task priority level
 254  */
 255 static unsigned long EFIAPI efi_raise_tpl(efi_uintn_t new_tpl)
 256 {
 257         efi_uintn_t old_tpl = efi_tpl;
 258
 259         EFI_ENTRY("0x%zx", new_tpl);
 260
 261         if (new_tpl < efi_tpl)
 262                 debug("WARNING: new_tpl < current_tpl in %s\n", __func__);
 263         efi_tpl = new_tpl;
 264         if (efi_tpl > TPL_HIGH_LEVEL)
 265                 efi_tpl = TPL_HIGH_LEVEL;
 266
 267         EFI_EXIT(EFI_SUCCESS);
 268         return old_tpl;
 269 }
 270
 271 /**
 272  * efi_restore_tpl() - lower the task priority level
 273  * @old_tpl: value of the task priority level to be restored
 274  *
 275  * This function implements the RestoreTpl service.
 276  *
 277  * See the Unified Extensible Firmware Interface (UEFI) specification for
 278  * details.
 279  */
 280 static void EFIAPI efi_restore_tpl(efi_uintn_t old_tpl)
 281 {
 282         EFI_ENTRY("0x%zx", old_tpl);
 283
 284         if (old_tpl > efi_tpl)
 285                 debug("WARNING: old_tpl > current_tpl in %s\n", __func__);
 286         efi_tpl = old_tpl;
 287         if (efi_tpl > TPL_HIGH_LEVEL)
 288                 efi_tpl = TPL_HIGH_LEVEL;
 289
 290         /*
 291          * Lowering the TPL may have made queued events eligible for execution.
 292          */
 293         efi_timer_check();
 294
 295         EFI_EXIT(EFI_SUCCESS);
 296 }
 297
 298 /**
 299  * efi_allocate_pages_ext() - allocate memory pages
 300  * @type:        type of allocation to be performed
 301  * @memory_type: usage type of the allocated memory
 302  * @pages:       number of pages to be allocated
 303  * @memory:      allocated memory
 304  *
 305  * This function implements the AllocatePages service.
 306  *
 307  * See the Unified Extensible Firmware Interface (UEFI) specification for
 308  * details.
 309  *
 310  * Return: status code
 311  */
 312 static efi_status_t EFIAPI efi_allocate_pages_ext(int type, int memory_type,
 313                                                   efi_uintn_t pages,
 314                                                   uint64_t *memory)
 315 {
 316         efi_status_t r;
 317
 318         EFI_ENTRY("%d, %d, 0x%zx, %p", type, memory_type, pages, memory);
 319         r = efi_allocate_pages(type, memory_type, pages, memory);
 320         return EFI_EXIT(r);
 321 }
 322
 323 /**
 324  * efi_free_pages_ext() - Free memory pages.
 325  * @memory: start of the memory area to be freed
 326  * @pages:  number of pages to be freed
 327  *
 328  * This function implements the FreePages service.
 329  *
 330  * See the Unified Extensible Firmware Interface (UEFI) specification for
 331  * details.
 332  *
 333  * Return: status code
 334  */
 335 static efi_status_t EFIAPI efi_free_pages_ext(uint64_t memory,
 336                                               efi_uintn_t pages)
 337 {
 338         efi_status_t r;
 339
 340         EFI_ENTRY("%llx, 0x%zx", memory, pages);
 341         r = efi_free_pages(memory, pages);
 342         return EFI_EXIT(r);
 343 }
 344
 345 /**
 346  * efi_get_memory_map_ext() - get map describing memory usage
 347  * @memory_map_size:    on entry the size, in bytes, of the memory map buffer,
 348  *                      on exit the size of the copied memory map
 349  * @memory_map:         buffer to which the memory map is written
 350  * @map_key:            key for the memory map
 351  * @descriptor_size:    size of an individual memory descriptor
 352  * @descriptor_version: version number of the memory descriptor structure
 353  *
 354  * This function implements the GetMemoryMap service.
 355  *
 356  * See the Unified Extensible Firmware Interface (UEFI) specification for
 357  * details.
 358  *
 359  * Return: status code
 360  */
 361 static efi_status_t EFIAPI efi_get_memory_map_ext(
 362                                         efi_uintn_t *memory_map_size,
 363                                         struct efi_mem_desc *memory_map,
 364                                         efi_uintn_t *map_key,
 365                                         efi_uintn_t *descriptor_size,
 366                                         uint32_t *descriptor_version)
 367 {
 368         efi_status_t r;
 369
 370         EFI_ENTRY("%p, %p, %p, %p, %p", memory_map_size, memory_map,
 371                   map_key, descriptor_size, descriptor_version);
 372         r = efi_get_memory_map(memory_map_size, memory_map, map_key,
 373                                descriptor_size, descriptor_version);
 374         return EFI_EXIT(r);
 375 }
 376
 377 /**
 378  * efi_allocate_pool_ext() - allocate memory from pool
 379  * @pool_type: type of the pool from which memory is to be allocated
 380  * @size:      number of bytes to be allocated
 381  * @buffer:    allocated memory
 382  *
 383  * This function implements the AllocatePool service.
 384  *
 385  * See the Unified Extensible Firmware Interface (UEFI) specification for
 386  * details.
 387  *
 388  * Return: status code
 389  */
 390 static efi_status_t EFIAPI efi_allocate_pool_ext(int pool_type,
 391                                                  efi_uintn_t size,
 392                                                  void **buffer)
 393 {
 394         efi_status_t r;
 395
 396         EFI_ENTRY("%d, %zd, %p", pool_type, size, buffer);
 397         r = efi_allocate_pool(pool_type, size, buffer);
 398         return EFI_EXIT(r);
 399 }
 400
 401 /**
 402  * efi_free_pool_ext() - free memory from pool
 403  * @buffer: start of memory to be freed
 404  *
 405  * This function implements the FreePool service.
 406  *
 407  * See the Unified Extensible Firmware Interface (UEFI) specification for
 408  * details.
 409  *
 410  * Return: status code
 411  */
 412 static efi_status_t EFIAPI efi_free_pool_ext(void *buffer)
 413 {
 414         efi_status_t r;
 415
 416         EFI_ENTRY("%p", buffer);
 417         r = efi_free_pool(buffer);
 418         return EFI_EXIT(r);
 419 }
 420
 421 /**
 422  * efi_add_handle() - add a new object to the object list
 423  * @obj: object to be added
 424  *
 425  * The protocols list is initialized. The object handle is set.
 426  */
 427 void efi_add_handle(struct efi_object *obj)
 428 {
 429         if (!obj)
 430                 return;
 431         INIT_LIST_HEAD(&obj->protocols);
 432         obj->handle = obj;
 433         list_add_tail(&obj->link, &efi_obj_list);
 434 }
 435
 436 /**
 437  * efi_create_handle() - create handle
 438  * @handle: new handle
 439  *
 440  * Return: status code
 441  */
 442 efi_status_t efi_create_handle(efi_handle_t *handle)
 443 {
 444         struct efi_object *obj;
 445
 446         obj = calloc(1, sizeof(struct efi_object));
 447         if (!obj)
 448                 return EFI_OUT_OF_RESOURCES;
 449
 450         efi_add_handle(obj);
 451         *handle = obj->handle;
 452
 453         return EFI_SUCCESS;
 454 }
 455
 456 /**
 457  * efi_search_protocol() - find a protocol on a handle.
 458  * @handle:        handle
 459  * @protocol_guid: GUID of the protocol
 460  * @handler:       reference to the protocol
 461  *
 462  * Return: status code
 463  */
 464 efi_status_t efi_search_protocol(const efi_handle_t handle,
 465                                  const efi_guid_t *protocol_guid,
 466                                  struct efi_handler **handler)
 467 {
 468         struct efi_object *efiobj;
 469         struct list_head *lhandle;
 470
 471         if (!handle || !protocol_guid)
 472                 return EFI_INVALID_PARAMETER;
 473         efiobj = efi_search_obj(handle);
 474         if (!efiobj)
 475                 return EFI_INVALID_PARAMETER;
 476         list_for_each(lhandle, &efiobj->protocols) {
 477                 struct efi_handler *protocol;
 478
 479                 protocol = list_entry(lhandle, struct efi_handler, link);
 480                 if (!guidcmp(protocol->guid, protocol_guid)) {
 481                         if (handler)
 482                                 *handler = protocol;
 483                         return EFI_SUCCESS;
 484                 }
 485         }
 486         return EFI_NOT_FOUND;
 487 }
 488
 489 /**
 490  * efi_remove_protocol() - delete protocol from a handle
 491  * @handle:             handle from which the protocol shall be deleted
 492  * @protocol:           GUID of the protocol to be deleted
 493  * @protocol_interface: interface of the protocol implementation
 494  *
 495  * Return: status code
 496  */
 497 efi_status_t efi_remove_protocol(const efi_handle_t handle,
 498                                  const efi_guid_t *protocol,
 499                                  void *protocol_interface)
 500 {
 501         struct efi_handler *handler;
 502         efi_status_t ret;
 503
 504         ret = efi_search_protocol(handle, protocol, &handler);
 505         if (ret != EFI_SUCCESS)
 506                 return ret;
 507         if (guidcmp(handler->guid, protocol))
 508                 return EFI_INVALID_PARAMETER;
 509         if (handler->protocol_interface != protocol_interface)
 510                 return EFI_INVALID_PARAMETER;
 511         list_del(&handler->link);
 512         free(handler);
 513         return EFI_SUCCESS;
 514 }
 515
 516 /**
 517  * efi_remove_all_protocols() - delete all protocols from a handle
 518  * @handle: handle from which the protocols shall be deleted
 519  *
 520  * Return: status code
 521  */
 522 efi_status_t efi_remove_all_protocols(const efi_handle_t handle)
 523 {
 524         struct efi_object *efiobj;
 525         struct efi_handler *protocol;
 526         struct efi_handler *pos;
 527
 528         efiobj = efi_search_obj(handle);
 529         if (!efiobj)
 530                 return EFI_INVALID_PARAMETER;
 531         list_for_each_entry_safe(protocol, pos, &efiobj->protocols, link) {
 532                 efi_status_t ret;
 533
 534                 ret = efi_remove_protocol(handle, protocol->guid,
 535                                           protocol->protocol_interface);
 536                 if (ret != EFI_SUCCESS)
 537                         return ret;
 538         }
 539         return EFI_SUCCESS;
 540 }
 541
 542 /**
 543  * efi_delete_handle() - delete handle
 544  *
 545  * @obj: handle to delete
 546  */
 547 void efi_delete_handle(struct efi_object *obj)
 548 {
 549         if (!obj)
 550                 return;
 551         efi_remove_all_protocols(obj->handle);
 552         list_del(&obj->link);
 553         free(obj);
 554 }
 555
 556 /**
 557  * efi_is_event() - check if a pointer is a valid event
 558  * @event: pointer to check
 559  *
 560  * Return: status code
 561  */
 562 static efi_status_t efi_is_event(const struct efi_event *event)
 563 {
 564         const struct efi_event *evt;
 565
 566         if (!event)
 567                 return EFI_INVALID_PARAMETER;
 568         list_for_each_entry(evt, &efi_events, link) {
 569                 if (evt == event)
 570                         return EFI_SUCCESS;
 571         }
 572         return EFI_INVALID_PARAMETER;
 573 }
 574
 575 /**
 576  * efi_create_event() - create an event
 577  * @type:            type of the event to create
 578  * @notify_tpl:      task priority level of the event
 579  * @notify_function: notification function of the event
 580  * @notify_context:  pointer passed to the notification function
 581  * @group:           event group
 582  * @event:           created event
 583  *
 584  * This function is used inside U-Boot code to create an event.
 585  *
 586  * For the API function implementing the CreateEvent service see
 587  * efi_create_event_ext.
 588  *
 589  * Return: status code
 590  */
 591 efi_status_t efi_create_event(uint32_t type, efi_uintn_t notify_tpl,
 592                               void (EFIAPI *notify_function) (
 593                                         struct efi_event *event,
 594                                         void *context),
 595                               void *notify_context, efi_guid_t *group,
 596                               struct efi_event **event)
 597 {
 598         struct efi_event *evt;
 599
 600         if (event == NULL)
 601                 return EFI_INVALID_PARAMETER;
 602
 603         switch (type) {
 604         case 0:
 605         case EVT_TIMER:
 606         case EVT_NOTIFY_SIGNAL:
 607         case EVT_TIMER | EVT_NOTIFY_SIGNAL:
 608         case EVT_NOTIFY_WAIT:
 609         case EVT_TIMER | EVT_NOTIFY_WAIT:
 610         case EVT_SIGNAL_EXIT_BOOT_SERVICES:
 611         case EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE:
 612                 break;
 613         default:
 614                 return EFI_INVALID_PARAMETER;
 615         }
 616
 617         if ((type & (EVT_NOTIFY_WAIT | EVT_NOTIFY_SIGNAL)) &&
 618             (is_valid_tpl(notify_tpl) != EFI_SUCCESS))
 619                 return EFI_INVALID_PARAMETER;
 620
 621         evt = calloc(1, sizeof(struct efi_event));
 622         if (!evt)
 623                 return EFI_OUT_OF_RESOURCES;
 624         evt->type = type;
 625         evt->notify_tpl = notify_tpl;
 626         evt->notify_function = notify_function;
 627         evt->notify_context = notify_context;
 628         evt->group = group;
 629         /* Disable timers on bootup */
 630         evt->trigger_next = -1ULL;
 631         evt->is_queued = false;
 632         evt->is_signaled = false;
 633         list_add_tail(&evt->link, &efi_events);
 634         *event = evt;
 635         return EFI_SUCCESS;
 636 }
 637
 638 /*
 639  * efi_create_event_ex() - create an event in a group
 640  * @type:            type of the event to create
 641  * @notify_tpl:      task priority level of the event
 642  * @notify_function: notification function of the event
 643  * @notify_context:  pointer passed to the notification function
 644  * @event:           created event
 645  * @event_group:     event group
 646  *
 647  * This function implements the CreateEventEx service.
 648  *
 649  * See the Unified Extensible Firmware Interface (UEFI) specification for
 650  * details.
 651  *
 652  * Return: status code
 653  */
 654 efi_status_t EFIAPI efi_create_event_ex(uint32_t type, efi_uintn_t notify_tpl,
 655                                         void (EFIAPI *notify_function) (
 656                                                         struct efi_event *event,
 657                                                         void *context),
 658                                         void *notify_context,
 659                                         efi_guid_t *event_group,
 660                                         struct efi_event **event)
 661 {
 662         EFI_ENTRY("%d, 0x%zx, %p, %p, %pUl", type, notify_tpl, notify_function,
 663                   notify_context, event_group);
 664         return EFI_EXIT(efi_create_event(type, notify_tpl, notify_function,
 665                                          notify_context, event_group, event));
 666 }
 667
 668 /**
 669  * efi_create_event_ext() - create an event
 670  * @type:            type of the event to create
 671  * @notify_tpl:      task priority level of the event
 672  * @notify_function: notification function of the event
 673  * @notify_context:  pointer passed to the notification function
 674  * @event:           created event
 675  *
 676  * This function implements the CreateEvent service.
 677  *
 678  * See the Unified Extensible Firmware Interface (UEFI) specification for
 679  * details.
 680  *
 681  * Return: status code
 682  */
 683 static efi_status_t EFIAPI efi_create_event_ext(
 684                         uint32_t type, efi_uintn_t notify_tpl,
 685                         void (EFIAPI *notify_function) (
 686                                         struct efi_event *event,
 687                                         void *context),
 688                         void *notify_context, struct efi_event **event)
 689 {
 690         EFI_ENTRY("%d, 0x%zx, %p, %p", type, notify_tpl, notify_function,
 691                   notify_context);
 692         return EFI_EXIT(efi_create_event(type, notify_tpl, notify_function,
 693                                          notify_context, NULL, event));
 694 }
 695
 696 /**
 697  * efi_timer_check() - check if a timer event has occurred
 698  *
 699  * Check if a timer event has occurred or a queued notification function should
 700  * be called.
 701  *
 702  * Our timers have to work without interrupts, so we check whenever keyboard
 703  * input or disk accesses happen if enough time elapsed for them to fire.
 704  */
 705 void efi_timer_check(void)
 706 {
 707         struct efi_event *evt;
 708         u64 now = timer_get_us();
 709
 710         list_for_each_entry(evt, &efi_events, link) {
 711                 if (evt->is_queued)
 712                         efi_queue_event(evt, true);
 713                 if (!(evt->type & EVT_TIMER) || now < evt->trigger_next)
 714                         continue;
 715                 switch (evt->trigger_type) {
 716                 case EFI_TIMER_RELATIVE:
 717                         evt->trigger_type = EFI_TIMER_STOP;
 718                         break;
 719                 case EFI_TIMER_PERIODIC:
 720                         evt->trigger_next += evt->trigger_time;
 721                         break;
 722                 default:
 723                         continue;
 724                 }
 725                 evt->is_signaled = false;
 726                 efi_signal_event(evt, true);
 727         }
 728         WATCHDOG_RESET();
 729 }
 730
 731 /**
 732  * efi_set_timer() - set the trigger time for a timer event or stop the event
 733  * @event:        event for which the timer is set
 734  * @type:         type of the timer
 735  * @trigger_time: trigger period in multiples of 100ns
 736  *
 737  * This is the function for internal usage in U-Boot. For the API function
 738  * implementing the SetTimer service see efi_set_timer_ext.
 739  *
 740  * Return: status code
 741  */
 742 efi_status_t efi_set_timer(struct efi_event *event, enum efi_timer_delay type,
 743                            uint64_t trigger_time)
 744 {
 745         /* Check that the event is valid */
 746         if (efi_is_event(event) != EFI_SUCCESS || !(event->type & EVT_TIMER))
 747                 return EFI_INVALID_PARAMETER;
 748
 749         /*
 750          * The parameter defines a multiple of 100ns.
 751          * We use multiples of 1000ns. So divide by 10.
 752          */
 753         do_div(trigger_time, 10);
 754
 755         switch (type) {
 756         case EFI_TIMER_STOP:
 757                 event->trigger_next = -1ULL;
 758                 break;
 759         case EFI_TIMER_PERIODIC:
 760         case EFI_TIMER_RELATIVE:
 761                 event->trigger_next = timer_get_us() + trigger_time;
 762                 break;
 763         default:
 764                 return EFI_INVALID_PARAMETER;
 765         }
 766         event->trigger_type = type;
 767         event->trigger_time = trigger_time;
 768         event->is_signaled = false;
 769         return EFI_SUCCESS;
 770 }
 771
 772 /**
 773  * efi_set_timer_ext() - Set the trigger time for a timer event or stop the
 774  *                       event
 775  * @event:        event for which the timer is set
 776  * @type:         type of the timer
 777  * @trigger_time: trigger period in multiples of 100ns
 778  *
 779  * This function implements the SetTimer service.
 780  *
 781  * See the Unified Extensible Firmware Interface (UEFI) specification for
 782  * details.
 783  *
 784  *
 785  * Return: status code
 786  */
 787 static efi_status_t EFIAPI efi_set_timer_ext(struct efi_event *event,
 788                                              enum efi_timer_delay type,
 789                                              uint64_t trigger_time)
 790 {
 791         EFI_ENTRY("%p, %d, %llx", event, type, trigger_time);
 792         return EFI_EXIT(efi_set_timer(event, type, trigger_time));
 793 }
 794
 795 /**
 796  * efi_wait_for_event() - wait for events to be signaled
 797  * @num_events: number of events to be waited for
 798  * @event:      events to be waited for
 799  * @index:      index of the event that was signaled
 800  *
 801  * This function implements the WaitForEvent service.
 802  *
 803  * See the Unified Extensible Firmware Interface (UEFI) specification for
 804  * details.
 805  *
 806  * Return: status code
 807  */
 808 static efi_status_t EFIAPI efi_wait_for_event(efi_uintn_t num_events,
 809                                               struct efi_event **event,
 810                                               efi_uintn_t *index)
 811 {
 812         int i;
 813
 814         EFI_ENTRY("%zd, %p, %p", num_events, event, index);
 815
 816         /* Check parameters */
 817         if (!num_events || !event)
 818                 return EFI_EXIT(EFI_INVALID_PARAMETER);
 819         /* Check TPL */
 820         if (efi_tpl != TPL_APPLICATION)
 821                 return EFI_EXIT(EFI_UNSUPPORTED);
 822         for (i = 0; i < num_events; ++i) {
 823                 if (efi_is_event(event[i]) != EFI_SUCCESS)
 824                         return EFI_EXIT(EFI_INVALID_PARAMETER);
 825                 if (!event[i]->type || event[i]->type & EVT_NOTIFY_SIGNAL)
 826                         return EFI_EXIT(EFI_INVALID_PARAMETER);
 827                 if (!event[i]->is_signaled)
 828                         efi_queue_event(event[i], true);
 829         }
 830
 831         /* Wait for signal */
 832         for (;;) {
 833                 for (i = 0; i < num_events; ++i) {
 834                         if (event[i]->is_signaled)
 835                                 goto out;
 836                 }
 837                 /* Allow events to occur. */
 838                 efi_timer_check();
 839         }
 840
 841 out:
 842         /*
 843          * Reset the signal which is passed to the caller to allow periodic
 844          * events to occur.
 845          */
 846         event[i]->is_signaled = false;
 847         if (index)
 848                 *index = i;
 849
 850         return EFI_EXIT(EFI_SUCCESS);
 851 }
 852
 853 /**
 854  * efi_signal_event_ext() - signal an EFI event
 855  * @event: event to signal
 856  *
 857  * This function implements the SignalEvent service.
 858  *
 859  * See the Unified Extensible Firmware Interface (UEFI) specification for
 860  * details.
 861  *
 862  * This functions sets the signaled state of the event and queues the
 863  * notification function for execution.
 864  *
 865  * Return: status code
 866  */
 867 static efi_status_t EFIAPI efi_signal_event_ext(struct efi_event *event)
 868 {
 869         EFI_ENTRY("%p", event);
 870         if (efi_is_event(event) != EFI_SUCCESS)
 871                 return EFI_EXIT(EFI_INVALID_PARAMETER);
 872         efi_signal_event(event, true);
 873         return EFI_EXIT(EFI_SUCCESS);
 874 }
 875
 876 /**
 877  * efi_close_event() - close an EFI event
 878  * @event: event to close
 879  *
 880  * This function implements the CloseEvent service.
 881  *
 882  * See the Unified Extensible Firmware Interface (UEFI) specification for
 883  * details.
 884  *
 885  * Return: status code
 886  */
 887 static efi_status_t EFIAPI efi_close_event(struct efi_event *event)
 888 {
 889         EFI_ENTRY("%p", event);
 890         if (efi_is_event(event) != EFI_SUCCESS)
 891                 return EFI_EXIT(EFI_INVALID_PARAMETER);
 892         list_del(&event->link);
 893         free(event);
 894         return EFI_EXIT(EFI_SUCCESS);
 895 }
 896
 897 /**
 898  * efi_check_event() - check if an event is signaled
 899  * @event: event to check
 900  *
 901  * This function implements the CheckEvent service.
 902  *
 903  * See the Unified Extensible Firmware Interface (UEFI) specification for
 904  * details.
 905  *
 906  * If an event is not signaled yet, the notification function is queued. The
 907  * signaled state is cleared.
 908  *
 909  * Return: status code
 910  */
 911 static efi_status_t EFIAPI efi_check_event(struct efi_event *event)
 912 {
 913         EFI_ENTRY("%p", event);
 914         efi_timer_check();
 915         if (efi_is_event(event) != EFI_SUCCESS ||
 916             event->type & EVT_NOTIFY_SIGNAL)
 917                 return EFI_EXIT(EFI_INVALID_PARAMETER);
 918         if (!event->is_signaled)
 919                 efi_queue_event(event, true);
 920         if (event->is_signaled) {
 921                 event->is_signaled = false;
 922                 return EFI_EXIT(EFI_SUCCESS);
 923         }
 924         return EFI_EXIT(EFI_NOT_READY);
 925 }
 926
 927 /**
 928  * efi_search_obj() - find the internal EFI object for a handle
 929  * @handle: handle to find
 930  *
 931  * Return: EFI object
 932  */
 933 struct efi_object *efi_search_obj(const efi_handle_t handle)
 934 {
 935         struct efi_object *efiobj;
 936
 937         list_for_each_entry(efiobj, &efi_obj_list, link) {
 938                 if (efiobj->handle == handle)
 939                         return efiobj;
 940         }
 941
 942         return NULL;
 943 }
 944
 945 /**
 946  * efi_open_protocol_info_entry() - create open protocol info entry and add it
 947  *                                  to a protocol
 948  * @handler: handler of a protocol
 949  *
 950  * Return: open protocol info entry
 951  */
 952 static struct efi_open_protocol_info_entry *efi_create_open_info(
 953                         struct efi_handler *handler)
 954 {
 955         struct efi_open_protocol_info_item *item;
 956
 957         item = calloc(1, sizeof(struct efi_open_protocol_info_item));
 958         if (!item)
 959                 return NULL;
 960         /* Append the item to the open protocol info list. */
 961         list_add_tail(&item->link, &handler->open_infos);
 962
 963         return &item->info;
 964 }
 965
 966 /**
 967  * efi_delete_open_info() - remove an open protocol info entry from a protocol
 968  * @item: open protocol info entry to delete
 969  *
 970  * Return: status code
 971  */
 972 static efi_status_t efi_delete_open_info(
 973                         struct efi_open_protocol_info_item *item)
 974 {
 975         list_del(&item->link);
 976         free(item);
 977         return EFI_SUCCESS;
 978 }
 979
 980 /**
 981  * efi_add_protocol() - install new protocol on a handle
 982  * @handle:             handle on which the protocol shall be installed
 983  * @protocol:           GUID of the protocol to be installed
 984  * @protocol_interface: interface of the protocol implementation
 985  *
 986  * Return: status code
 987  */
 988 efi_status_t efi_add_protocol(const efi_handle_t handle,
 989                               const efi_guid_t *protocol,
 990                               void *protocol_interface)
 991 {
 992         struct efi_object *efiobj;
 993         struct efi_handler *handler;
 994         efi_status_t ret;
 995
 996         efiobj = efi_search_obj(handle);
 997         if (!efiobj)
 998                 return EFI_INVALID_PARAMETER;
 999         ret = efi_search_protocol(handle, protocol, NULL);
1000         if (ret != EFI_NOT_FOUND)
1001                 return EFI_INVALID_PARAMETER;
1002         handler = calloc(1, sizeof(struct efi_handler));
1003         if (!handler)
1004                 return EFI_OUT_OF_RESOURCES;
1005         handler->guid = protocol;
1006         handler->protocol_interface = protocol_interface;
1007         INIT_LIST_HEAD(&handler->open_infos);
1008         list_add_tail(&handler->link, &efiobj->protocols);
1009         if (!guidcmp(&efi_guid_device_path, protocol))
1010                 EFI_PRINT("installed device path '%pD'\n", protocol_interface);
1011         return EFI_SUCCESS;
1012 }
1013
1014 /**
1015  * efi_install_protocol_interface() - install protocol interface
1016  * @handle:                  handle on which the protocol shall be installed
1017  * @protocol:                GUID of the protocol to be installed
1018  * @protocol_interface_type: type of the interface to be installed,
1019  *                           always EFI_NATIVE_INTERFACE
1020  * @protocol_interface:      interface of the protocol implementation
1021  *
1022  * This function implements the InstallProtocolInterface service.
1023  *
1024  * See the Unified Extensible Firmware Interface (UEFI) specification for
1025  * details.
1026  *
1027  * Return: status code
1028  */
1029 static efi_status_t EFIAPI efi_install_protocol_interface(
1030                         void **handle, const efi_guid_t *protocol,
1031                         int protocol_interface_type, void *protocol_interface)
1032 {
1033         efi_status_t r;
1034
1035         EFI_ENTRY("%p, %pUl, %d, %p", handle, protocol, protocol_interface_type,
1036                   protocol_interface);
1037
1038         if (!handle || !protocol ||
1039             protocol_interface_type != EFI_NATIVE_INTERFACE) {
1040                 r = EFI_INVALID_PARAMETER;
1041                 goto out;
1042         }
1043
1044         /* Create new handle if requested. */
1045         if (!*handle) {
1046                 r = efi_create_handle(handle);
1047                 if (r != EFI_SUCCESS)
1048                         goto out;
1049                 debug("%sEFI: new handle %p\n", indent_string(nesting_level),
1050                       *handle);
1051         } else {
1052                 debug("%sEFI: handle %p\n", indent_string(nesting_level),
1053                       *handle);
1054         }
1055         /* Add new protocol */
1056         r = efi_add_protocol(*handle, protocol, protocol_interface);
1057 out:
1058         return EFI_EXIT(r);
1059 }
1060
1061 /**
1062  * efi_get_drivers() - get all drivers associated to a controller
1063  * @efiobj:               handle of the controller
1064  * @protocol:             protocol guid (optional)
1065  * @number_of_drivers:    number of child controllers
1066  * @driver_handle_buffer: handles of the the drivers
1067  *
1068  * The allocated buffer has to be freed with free().
1069  *
1070  * Return: status code
1071  */
1072 static efi_status_t efi_get_drivers(struct efi_object *efiobj,
1073                                     const efi_guid_t *protocol,
1074                                     efi_uintn_t *number_of_drivers,
1075                                     efi_handle_t **driver_handle_buffer)
1076 {
1077         struct efi_handler *handler;
1078         struct efi_open_protocol_info_item *item;
1079         efi_uintn_t count = 0, i;
1080         bool duplicate;
1081
1082         /* Count all driver associations */
1083         list_for_each_entry(handler, &efiobj->protocols, link) {
1084                 if (protocol && guidcmp(handler->guid, protocol))
1085                         continue;
1086                 list_for_each_entry(item, &handler->open_infos, link) {
1087                         if (item->info.attributes &
1088                             EFI_OPEN_PROTOCOL_BY_DRIVER)
1089                                 ++count;
1090                 }
1091         }
1092         /*
1093          * Create buffer. In case of duplicate driver assignments the buffer
1094          * will be too large. But that does not harm.
1095          */
1096         *number_of_drivers = 0;
1097         *driver_handle_buffer = calloc(count, sizeof(efi_handle_t));
1098         if (!*driver_handle_buffer)
1099                 return EFI_OUT_OF_RESOURCES;
1100         /* Collect unique driver handles */
1101         list_for_each_entry(handler, &efiobj->protocols, link) {
1102                 if (protocol && guidcmp(handler->guid, protocol))
1103                         continue;
1104                 list_for_each_entry(item, &handler->open_infos, link) {
1105                         if (item->info.attributes &
1106                             EFI_OPEN_PROTOCOL_BY_DRIVER) {
1107                                 /* Check this is a new driver */
1108                                 duplicate = false;
1109                                 for (i = 0; i < *number_of_drivers; ++i) {
1110                                         if ((*driver_handle_buffer)[i] ==
1111                                             item->info.agent_handle)
1112                                                 duplicate = true;
1113                                 }
1114                                 /* Copy handle to buffer */
1115                                 if (!duplicate) {
1116                                         i = (*number_of_drivers)++;
1117                                         (*driver_handle_buffer)[i] =
1118                                                 item->info.agent_handle;
1119                                 }
1120                         }
1121                 }
1122         }
1123         return EFI_SUCCESS;
1124 }
1125
1126 /**
1127  * efi_disconnect_all_drivers() - disconnect all drivers from a controller
1128  * @efiobj:       handle of the controller
1129  * @protocol:     protocol guid (optional)
1130  * @child_handle: handle of the child to destroy
1131  *
1132  * This function implements the DisconnectController service.
1133  *
1134  * See the Unified Extensible Firmware Interface (UEFI) specification for
1135  * details.
1136  *
1137  * Return: status code
1138  */
1139 static efi_status_t efi_disconnect_all_drivers(
1140                                 struct efi_object *efiobj,
1141                                 const efi_guid_t *protocol,
1142                                 efi_handle_t child_handle)
1143 {
1144         efi_uintn_t number_of_drivers;
1145         efi_handle_t *driver_handle_buffer;
1146         efi_status_t r, ret;
1147
1148         ret = efi_get_drivers(efiobj, protocol, &number_of_drivers,
1149                               &driver_handle_buffer);
1150         if (ret != EFI_SUCCESS)
1151                 return ret;
1152
1153         ret = EFI_NOT_FOUND;
1154         while (number_of_drivers) {
1155                 r = EFI_CALL(efi_disconnect_controller(
1156                                 efiobj->handle,
1157                                 driver_handle_buffer[--number_of_drivers],
1158                                 child_handle));
1159                 if (r == EFI_SUCCESS)
1160                         ret = r;
1161         }
1162         free(driver_handle_buffer);
1163         return ret;
1164 }
1165
1166 /**
1167  * efi_uninstall_protocol_interface() - uninstall protocol interface
1168  * @handle:             handle from which the protocol shall be removed
1169  * @protocol:           GUID of the protocol to be removed
1170  * @protocol_interface: interface to be removed
1171  *
1172  * This function implements the UninstallProtocolInterface service.
1173  *
1174  * See the Unified Extensible Firmware Interface (UEFI) specification for
1175  * details.
1176  *
1177  * Return: status code
1178  */
1179 static efi_status_t EFIAPI efi_uninstall_protocol_interface(
1180                                 efi_handle_t handle, const efi_guid_t *protocol,
1181                                 void *protocol_interface)
1182 {
1183         struct efi_object *efiobj;
1184         struct efi_handler *handler;
1185         struct efi_open_protocol_info_item *item;
1186         struct efi_open_protocol_info_item *pos;
1187         efi_status_t r;
1188
1189         EFI_ENTRY("%p, %pUl, %p", handle, protocol, protocol_interface);
1190
1191         /* Check handle */
1192         efiobj = efi_search_obj(handle);
1193         if (!efiobj) {
1194                 r = EFI_INVALID_PARAMETER;
1195                 goto out;
1196         }
1197         /* Find the protocol on the handle */
1198         r = efi_search_protocol(handle, protocol, &handler);
1199         if (r != EFI_SUCCESS)
1200                 goto out;
1201         /* Disconnect controllers */
1202         efi_disconnect_all_drivers(efiobj, protocol, NULL);
1203         if (!list_empty(&handler->open_infos)) {
1204                 r =  EFI_ACCESS_DENIED;
1205                 goto out;
1206         }
1207         /* Close protocol */
1208         list_for_each_entry_safe(item, pos, &handler->open_infos, link) {
1209                 if (item->info.attributes ==
1210                         EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL ||
1211                     item->info.attributes == EFI_OPEN_PROTOCOL_GET_PROTOCOL ||
1212                     item->info.attributes == EFI_OPEN_PROTOCOL_TEST_PROTOCOL)
1213                         list_del(&item->link);
1214         }
1215         if (!list_empty(&handler->open_infos)) {
1216                 r =  EFI_ACCESS_DENIED;
1217                 goto out;
1218         }
1219         r = efi_remove_protocol(handle, protocol, protocol_interface);
1220 out:
1221         return EFI_EXIT(r);
1222 }
1223
1224 /**
1225  * efi_register_protocol_notify() - register an event for notification when a
1226  *                                  protocol is installed.
1227  * @protocol:     GUID of the protocol whose installation shall be notified
1228  * @event:        event to be signaled upon installation of the protocol
1229  * @registration: key for retrieving the registration information
1230  *
1231  * This function implements the RegisterProtocolNotify service.
1232  * See the Unified Extensible Firmware Interface (UEFI) specification
1233  * for details.
1234  *
1235  * Return: status code
1236  */
1237 static efi_status_t EFIAPI efi_register_protocol_notify(
1238                                                 const efi_guid_t *protocol,
1239                                                 struct efi_event *event,
1240                                                 void **registration)
1241 {
1242         EFI_ENTRY("%pUl, %p, %p", protocol, event, registration);
1243         return EFI_EXIT(EFI_OUT_OF_RESOURCES);
1244 }
1245
1246 /**
1247  * efi_search() - determine if an EFI handle implements a protocol
1248  * @search_type: selection criterion
1249  * @protocol:    GUID of the protocol
1250  * @search_key:  registration key
1251  * @efiobj:      handle
1252  *
1253  * See the documentation of the LocateHandle service in the UEFI specification.
1254  *
1255  * Return: 0 if the handle implements the protocol
1256  */
1257 static int efi_search(enum efi_locate_search_type search_type,
1258                       const efi_guid_t *protocol, void *search_key,
1259                       struct efi_object *efiobj)
1260 {
1261         efi_status_t ret;
1262
1263         switch (search_type) {
1264         case ALL_HANDLES:
1265                 return 0;
1266         case BY_REGISTER_NOTIFY:
1267                 /* TODO: RegisterProtocolNotify is not implemented yet */
1268                 return -1;
1269         case BY_PROTOCOL:
1270                 ret = efi_search_protocol(efiobj->handle, protocol, NULL);
1271                 return (ret != EFI_SUCCESS);
1272         default:
1273                 /* Invalid search type */
1274                 return -1;
1275         }
1276 }
1277
1278 /**
1279  * efi_locate_handle() - locate handles implementing a protocol
1280  * @search_type: selection criterion
1281  * @protocol:    GUID of the protocol
1282  * @search_key: registration key
1283  * @buffer_size: size of the buffer to receive the handles in bytes
1284  * @buffer:      buffer to receive the relevant handles
1285  *
1286  * This function is meant for U-Boot internal calls. For the API implementation
1287  * of the LocateHandle service see efi_locate_handle_ext.
1288  *
1289  * Return: status code
1290  */
1291 static efi_status_t efi_locate_handle(
1292                         enum efi_locate_search_type search_type,
1293                         const efi_guid_t *protocol, void *search_key,
1294                         efi_uintn_t *buffer_size, efi_handle_t *buffer)
1295 {
1296         struct efi_object *efiobj;
1297         efi_uintn_t size = 0;
1298
1299         /* Check parameters */
1300         switch (search_type) {
1301         case ALL_HANDLES:
1302                 break;
1303         case BY_REGISTER_NOTIFY:
1304                 if (!search_key)
1305                         return EFI_INVALID_PARAMETER;
1306                 /* RegisterProtocolNotify is not implemented yet */
1307                 return EFI_UNSUPPORTED;
1308         case BY_PROTOCOL:
1309                 if (!protocol)
1310                         return EFI_INVALID_PARAMETER;
1311                 break;
1312         default:
1313                 return EFI_INVALID_PARAMETER;
1314         }
1315
1316         /*
1317          * efi_locate_handle_buffer uses this function for
1318          * the calculation of the necessary buffer size.
1319          * So do not require a buffer for buffersize == 0.
1320          */
1321         if (!buffer_size || (*buffer_size && !buffer))
1322                 return EFI_INVALID_PARAMETER;
1323
1324         /* Count how much space we need */
1325         list_for_each_entry(efiobj, &efi_obj_list, link) {
1326                 if (!efi_search(search_type, protocol, search_key, efiobj))
1327                         size += sizeof(void *);
1328         }
1329
1330         if (*buffer_size < size) {
1331                 *buffer_size = size;
1332                 return EFI_BUFFER_TOO_SMALL;
1333         }
1334
1335         *buffer_size = size;
1336         if (size == 0)
1337                 return EFI_NOT_FOUND;
1338
1339         /* Then fill the array */
1340         list_for_each_entry(efiobj, &efi_obj_list, link) {
1341                 if (!efi_search(search_type, protocol, search_key, efiobj))
1342                         *buffer++ = efiobj->handle;
1343         }
1344
1345         return EFI_SUCCESS;
1346 }
1347
1348 /**
1349  * efi_locate_handle_ext() - locate handles implementing a protocol.
1350  * @search_type: selection criterion
1351  * @protocol:    GUID of the protocol
1352  * @search_key:  registration key
1353  * @buffer_size: size of the buffer to receive the handles in bytes
1354  * @buffer:      buffer to receive the relevant handles
1355  *
1356  * This function implements the LocateHandle service.
1357  *
1358  * See the Unified Extensible Firmware Interface (UEFI) specification for
1359  * details.
1360  *
1361  * Return: 0 if the handle implements the protocol
1362  */
1363 static efi_status_t EFIAPI efi_locate_handle_ext(
1364                         enum efi_locate_search_type search_type,
1365                         const efi_guid_t *protocol, void *search_key,
1366                         efi_uintn_t *buffer_size, efi_handle_t *buffer)
1367 {
1368         EFI_ENTRY("%d, %pUl, %p, %p, %p", search_type, protocol, search_key,
1369                   buffer_size, buffer);
1370
1371         return EFI_EXIT(efi_locate_handle(search_type, protocol, search_key,
1372                         buffer_size, buffer));
1373 }
1374
1375 /**
1376  * efi_remove_configuration_table() - collapses configuration table entries,
1377  *                                    removing index i
1378  *
1379  * @i: index of the table entry to be removed
1380  */
1381 static void efi_remove_configuration_table(int i)
1382 {
1383         struct efi_configuration_table *this = &systab.tables[i];
1384         struct efi_configuration_table *next = &systab.tables[i + 1];
1385         struct efi_configuration_table *end = &systab.tables[systab.nr_tables];
1386
1387         memmove(this, next, (ulong)end - (ulong)next);
1388         systab.nr_tables--;
1389 }
1390
1391 /**
1392  * efi_install_configuration_table() - adds, updates, or removes a
1393  *                                     configuration table
1394  * @guid:  GUID of the installed table
1395  * @table: table to be installed
1396  *
1397  * This function is used for internal calls. For the API implementation of the
1398  * InstallConfigurationTable service see efi_install_configuration_table_ext.
1399  *
1400  * Return: status code
1401  */
1402 efi_status_t efi_install_configuration_table(const efi_guid_t *guid,
1403                                              void *table)
1404 {
1405         struct efi_event *evt;
1406         int i;
1407
1408         if (!guid)
1409                 return EFI_INVALID_PARAMETER;
1410
1411         /* Check for guid override */
1412         for (i = 0; i < systab.nr_tables; i++) {
1413                 if (!guidcmp(guid, &systab.tables[i].guid)) {
1414                         if (table)
1415                                 systab.tables[i].table = table;
1416                         else
1417                                 efi_remove_configuration_table(i);
1418                         goto out;
1419                 }
1420         }
1421
1422         if (!table)
1423                 return EFI_NOT_FOUND;
1424
1425         /* No override, check for overflow */
1426         if (i >= EFI_MAX_CONFIGURATION_TABLES)
1427                 return EFI_OUT_OF_RESOURCES;
1428
1429         /* Add a new entry */
1430         memcpy(&systab.tables[i].guid, guid, sizeof(*guid));
1431         systab.tables[i].table = table;
1432         systab.nr_tables = i + 1;
1433
1434 out:
1435         /* systab.nr_tables may have changed. So we need to update the crc32 */
1436         efi_update_table_header_crc32(&systab.hdr);
1437
1438         /* Notify that the configuration table was changed */
1439         list_for_each_entry(evt, &efi_events, link) {
1440                 if (evt->group && !guidcmp(evt->group, guid)) {
1441                         efi_signal_event(evt, false);
1442                         break;
1443                 }
1444         }
1445
1446         return EFI_SUCCESS;
1447 }
1448
1449 /**
1450  * efi_install_configuration_table_ex() - Adds, updates, or removes a
1451  *                                        configuration table.
1452  * @guid:  GUID of the installed table
1453  * @table: table to be installed
1454  *
1455  * This function implements the InstallConfigurationTable service.
1456  *
1457  * See the Unified Extensible Firmware Interface (UEFI) specification for
1458  * details.
1459  *
1460  * Return: status code
1461  */
1462 static efi_status_t EFIAPI efi_install_configuration_table_ext(efi_guid_t *guid,
1463                                                                void *table)
1464 {
1465         EFI_ENTRY("%pUl, %p", guid, table);
1466         return EFI_EXIT(efi_install_configuration_table(guid, table));
1467 }
1468
1469 /**
1470  * efi_setup_loaded_image() - initialize a loaded image
1471  * @info:        loaded image info to be passed to the entry point of the image
1472  * @obj:         internal object associated with the loaded image
1473  * @device_path: device path of the loaded image
1474  * @file_path:   file path of the loaded image
1475  *
1476  * Initialize a loaded_image_info and loaded_image_info object with correct
1477  * protocols, boot-device, etc.
1478  *
1479  * Return: status code
1480  */
1481 efi_status_t efi_setup_loaded_image(
1482                         struct efi_loaded_image *info, struct efi_object *obj,
1483                         struct efi_device_path *device_path,
1484                         struct efi_device_path *file_path)
1485 {
1486         efi_status_t ret;
1487
1488         /* Add internal object to object list */
1489         efi_add_handle(obj);
1490         /* efi_exit() assumes that the handle points to the info */
1491         obj->handle = info;
1492
1493         info->revision =  EFI_LOADED_IMAGE_PROTOCOL_REVISION;
1494         info->file_path = file_path;
1495         info->system_table = &systab;
1496
1497         if (device_path) {
1498                 info->device_handle = efi_dp_find_obj(device_path, NULL);
1499                 /*
1500                  * When asking for the device path interface, return
1501                  * bootefi_device_path
1502                  */
1503                 ret = efi_add_protocol(obj->handle, &efi_guid_device_path,
1504                                        device_path);
1505                 if (ret != EFI_SUCCESS)
1506                         goto failure;
1507         }
1508
1509         /*
1510          * When asking for the loaded_image interface, just
1511          * return handle which points to loaded_image_info
1512          */
1513         ret = efi_add_protocol(obj->handle, &efi_guid_loaded_image, info);
1514         if (ret != EFI_SUCCESS)
1515                 goto failure;
1516
1517         ret = efi_add_protocol(obj->handle,
1518                                &efi_guid_device_path_to_text_protocol,
1519                                (void *)&efi_device_path_to_text);
1520         if (ret != EFI_SUCCESS)
1521                 goto failure;
1522
1523         ret = efi_add_protocol(obj->handle,
1524                                &efi_guid_device_path_utilities_protocol,
1525                                (void *)&efi_device_path_utilities);
1526         if (ret != EFI_SUCCESS)
1527                 goto failure;
1528
1529         return ret;
1530 failure:
1531         printf("ERROR: Failure to install protocols for loaded image\n");
1532         return ret;
1533 }
1534
1535 /**
1536  * efi_load_image_from_path() - load an image using a file path
1537  * @file_path: the path of the image to load
1538  * @buffer:    buffer containing the loaded image
1539  *
1540  * Return: status code
1541  */
1542 efi_status_t efi_load_image_from_path(struct efi_device_path *file_path,
1543                                       void **buffer)
1544 {
1545         struct efi_file_info *info = NULL;
1546         struct efi_file_handle *f;
1547         static efi_status_t ret;
1548         efi_uintn_t bs;
1549
1550         f = efi_file_from_path(file_path);
1551         if (!f)
1552                 return EFI_DEVICE_ERROR;
1553
1554         bs = 0;
1555         EFI_CALL(ret = f->getinfo(f, (efi_guid_t *)&efi_file_info_guid,
1556                                   &bs, info));
1557         if (ret == EFI_BUFFER_TOO_SMALL) {
1558                 info = malloc(bs);
1559                 EFI_CALL(ret = f->getinfo(f, (efi_guid_t *)&efi_file_info_guid,
1560                                           &bs, info));
1561         }
1562         if (ret != EFI_SUCCESS)
1563                 goto error;
1564
1565         ret = efi_allocate_pool(EFI_LOADER_DATA, info->file_size, buffer);
1566         if (ret)
1567                 goto error;
1568
1569         bs = info->file_size;
1570         EFI_CALL(ret = f->read(f, &bs, *buffer));
1571
1572 error:
1573         free(info);
1574         EFI_CALL(f->close(f));
1575
1576         if (ret != EFI_SUCCESS) {
1577                 efi_free_pool(*buffer);
1578                 *buffer = NULL;
1579         }
1580
1581         return ret;
1582 }
1583
1584 /**
1585  * efi_load_image() - load an EFI image into memory
1586  * @boot_policy:   true for request originating from the boot manager
1587  * @parent_image:  the caller's image handle
1588  * @file_path:     the path of the image to load
1589  * @source_buffer: memory location from which the image is installed
1590  * @source_size:   size of the memory area from which the image is installed
1591  * @image_handle:  handle for the newly installed image
1592  *
1593  * This function implements the LoadImage service.
1594  *
1595  * See the Unified Extensible Firmware Interface (UEFI) specification
1596  * for details.
1597  *
1598  * Return: status code
1599  */
1600 static efi_status_t EFIAPI efi_load_image(bool boot_policy,
1601                                           efi_handle_t parent_image,
1602                                           struct efi_device_path *file_path,
1603                                           void *source_buffer,
1604                                           efi_uintn_t source_size,
1605                                           efi_handle_t *image_handle)
1606 {
1607         struct efi_loaded_image *info;
1608         struct efi_object *obj;
1609         efi_status_t ret;
1610
1611         EFI_ENTRY("%d, %p, %pD, %p, %zd, %p", boot_policy, parent_image,
1612                   file_path, source_buffer, source_size, image_handle);
1613
1614         if (!image_handle || !parent_image) {
1615                 ret = EFI_INVALID_PARAMETER;
1616                 goto error;
1617         }
1618
1619         if (!source_buffer && !file_path) {
1620                 ret = EFI_NOT_FOUND;
1621                 goto error;
1622         }
1623
1624         info = calloc(1, sizeof(*info));
1625         if (!info) {
1626                 ret = EFI_OUT_OF_RESOURCES;
1627                 goto error;
1628         }
1629         obj = calloc(1, sizeof(*obj));
1630         if (!obj) {
1631                 free(info);
1632                 ret = EFI_OUT_OF_RESOURCES;
1633                 goto error;
1634         }
1635
1636         if (!source_buffer) {
1637                 struct efi_device_path *dp, *fp;
1638
1639                 ret = efi_load_image_from_path(file_path, &source_buffer);
1640                 if (ret != EFI_SUCCESS)
1641                         goto failure;
1642                 /*
1643                  * split file_path which contains both the device and
1644                  * file parts:
1645                  */
1646                 efi_dp_split_file_path(file_path, &dp, &fp);
1647                 ret = efi_setup_loaded_image(info, obj, dp, fp);
1648                 if (ret != EFI_SUCCESS)
1649                         goto failure;
1650         } else {
1651                 /* In this case, file_path is the "device" path, ie.
1652                  * something like a HARDWARE_DEVICE:MEMORY_MAPPED
1653                  */
1654                 ret = efi_setup_loaded_image(info, obj, file_path, NULL);
1655                 if (ret != EFI_SUCCESS)
1656                         goto failure;
1657         }
1658         info->reserved = efi_load_pe(source_buffer, info);
1659         if (!info->reserved) {
1660                 ret = EFI_UNSUPPORTED;
1661                 goto failure;
1662         }
1663         info->system_table = &systab;
1664         info->parent_handle = parent_image;
1665         *image_handle = obj->handle;
1666         return EFI_EXIT(EFI_SUCCESS);
1667 failure:
1668         free(info);
1669         efi_delete_handle(obj);
1670 error:
1671         return EFI_EXIT(ret);
1672 }
1673
1674 /**
1675  * efi_start_image() - dall the entry point of an image
1676  * @image_handle:   handle of the image
1677  * @exit_data_size: size of the buffer
1678  * @exit_data:      buffer to receive the exit data of the called image
1679  *
1680  * This function implements the StartImage service.
1681  *
1682  * See the Unified Extensible Firmware Interface (UEFI) specification for
1683  * details.
1684  *
1685  * Return: status code
1686  */
1687 static efi_status_t EFIAPI efi_start_image(efi_handle_t image_handle,
1688                                            unsigned long *exit_data_size,
1689                                            s16 **exit_data)
1690 {
1691         EFIAPI efi_status_t (*entry)(efi_handle_t image_handle,
1692                                      struct efi_system_table *st);
1693         struct efi_loaded_image *info = image_handle;
1694         efi_status_t ret;
1695
1696         EFI_ENTRY("%p, %p, %p", image_handle, exit_data_size, exit_data);
1697         entry = info->reserved;
1698
1699         efi_is_direct_boot = false;
1700
1701         /* call the image! */
1702         if (setjmp(&info->exit_jmp)) {
1703                 /*
1704                  * We called the entry point of the child image with EFI_CALL
1705                  * in the lines below. The child image called the Exit() boot
1706                  * service efi_exit() which executed the long jump that brought
1707                  * us to the current line. This implies that the second half
1708                  * of the EFI_CALL macro has not been executed.
1709                  */
1710 #ifdef CONFIG_ARM
1711                 /*
1712                  * efi_exit() called efi_restore_gd(). We have to undo this
1713                  * otherwise __efi_entry_check() will put the wrong value into
1714                  * app_gd.
1715                  */
1716                 gd = app_gd;
1717 #endif
1718                 /*
1719                  * To get ready to call EFI_EXIT below we have to execute the
1720                  * missed out steps of EFI_CALL.
1721                  */
1722                 assert(__efi_entry_check());
1723                 debug("%sEFI: %lu returned by started image\n",
1724                       __efi_nesting_dec(),
1725                       (unsigned long)((uintptr_t)info->exit_status &
1726                                       ~EFI_ERROR_MASK));
1727                 return EFI_EXIT(info->exit_status);
1728         }
1729
1730         ret = EFI_CALL(entry(image_handle, &systab));
1731
1732         /*
1733          * Usually UEFI applications call Exit() instead of returning.
1734          * But because the world doesn not consist of ponies and unicorns,
1735          * we're happy to emulate that behavior on behalf of a payload
1736          * that forgot.
1737          */
1738         return EFI_CALL(systab.boottime->exit(image_handle, ret, 0, NULL));
1739 }
1740
1741 /**
1742  * efi_exit() - leave an EFI application or driver
1743  * @image_handle:   handle of the application or driver that is exiting
1744  * @exit_status:    status code
1745  * @exit_data_size: size of the buffer in bytes
1746  * @exit_data:      buffer with data describing an error
1747  *
1748  * This function implements the Exit service.
1749  *
1750  * See the Unified Extensible Firmware Interface (UEFI) specification for
1751  * details.
1752  *
1753  * Return: status code
1754  */
1755 static efi_status_t EFIAPI efi_exit(efi_handle_t image_handle,
1756                                     efi_status_t exit_status,
1757                                     unsigned long exit_data_size,
1758                                     int16_t *exit_data)
1759 {
1760         /*
1761          * We require that the handle points to the original loaded
1762          * image protocol interface.
1763          *
1764          * For getting the longjmp address this is safer than locating
1765          * the protocol because the protocol may have been reinstalled
1766          * pointing to another memory location.
1767          *
1768          * TODO: We should call the unload procedure of the loaded
1769          *       image protocol.
1770          */
1771         struct efi_loaded_image *loaded_image_info = (void *)image_handle;
1772
1773         EFI_ENTRY("%p, %ld, %ld, %p", image_handle, exit_status,
1774                   exit_data_size, exit_data);
1775
1776         /* Make sure entry/exit counts for EFI world cross-overs match */
1777         EFI_EXIT(exit_status);
1778
1779         /*
1780          * But longjmp out with the U-Boot gd, not the application's, as
1781          * the other end is a setjmp call inside EFI context.
1782          */
1783         efi_restore_gd();
1784
1785         loaded_image_info->exit_status = exit_status;
1786         longjmp(&loaded_image_info->exit_jmp, 1);
1787
1788         panic("EFI application exited");
1789 }
1790
1791 /**
1792  * efi_unload_image() - unload an EFI image
1793  * @image_handle: handle of the image to be unloaded
1794  *
1795  * This function implements the UnloadImage service.
1796  *
1797  * See the Unified Extensible Firmware Interface (UEFI) specification for
1798  * details.
1799  *
1800  * Return: status code
1801  */
1802 static efi_status_t EFIAPI efi_unload_image(efi_handle_t image_handle)
1803 {
1804         struct efi_object *efiobj;
1805
1806         EFI_ENTRY("%p", image_handle);
1807         efiobj = efi_search_obj(image_handle);
1808         if (efiobj)
1809                 list_del(&efiobj->link);
1810
1811         return EFI_EXIT(EFI_SUCCESS);
1812 }
1813
1814 /**
1815  * efi_exit_caches() - fix up caches for EFI payloads if necessary
1816  */
1817 static void efi_exit_caches(void)
1818 {
1819 #if defined(CONFIG_ARM) && !defined(CONFIG_ARM64)
1820         /*
1821          * Grub on 32bit ARM needs to have caches disabled before jumping into
1822          * a zImage, but does not know of all cache layers. Give it a hand.
1823          */
1824         if (efi_is_direct_boot)
1825                 cleanup_before_linux();
1826 #endif
1827 }
1828
1829 /**
1830  * efi_exit_boot_services() - stop all boot services
1831  * @image_handle: handle of the loaded image
1832  * @map_key:      key of the memory map
1833  *
1834  * This function implements the ExitBootServices service.
1835  *
1836  * See the Unified Extensible Firmware Interface (UEFI) specification
1837  * for details.
1838  *
1839  * All timer events are disabled. For exit boot services events the
1840  * notification function is called. The boot services are disabled in the
1841  * system table.
1842  *
1843  * Return: status code
1844  */
1845 static efi_status_t EFIAPI efi_exit_boot_services(efi_handle_t image_handle,
1846                                                   unsigned long map_key)
1847 {
1848         struct efi_event *evt;
1849
1850         EFI_ENTRY("%p, %ld", image_handle, map_key);
1851
1852         /* Check that the caller has read the current memory map */
1853         if (map_key != efi_memory_map_key)
1854                 return EFI_INVALID_PARAMETER;
1855
1856         /* Make sure that notification functions are not called anymore */
1857         efi_tpl = TPL_HIGH_LEVEL;
1858
1859         /* Check if ExitBootServices has already been called */
1860         if (!systab.boottime)
1861                 return EFI_EXIT(EFI_SUCCESS);
1862
1863         /* Add related events to the event group */
1864         list_for_each_entry(evt, &efi_events, link) {
1865                 if (evt->type == EVT_SIGNAL_EXIT_BOOT_SERVICES)
1866                         evt->group = &efi_guid_event_group_exit_boot_services;
1867         }
1868         /* Notify that ExitBootServices is invoked. */
1869         list_for_each_entry(evt, &efi_events, link) {
1870                 if (evt->group &&
1871                     !guidcmp(evt->group,
1872                              &efi_guid_event_group_exit_boot_services)) {
1873                         efi_signal_event(evt, false);
1874                         break;
1875                 }
1876         }
1877
1878         /* TODO Should persist EFI variables here */
1879
1880         board_quiesce_devices();
1881
1882         /* Fix up caches for EFI payloads if necessary */
1883         efi_exit_caches();
1884
1885         /* This stops all lingering devices */
1886         bootm_disable_interrupts();
1887
1888         /* Disable boottime services */
1889         systab.con_in_handle = NULL;
1890         systab.con_in = NULL;
1891         systab.con_out_handle = NULL;
1892         systab.con_out = NULL;
1893         systab.stderr_handle = NULL;
1894         systab.std_err = NULL;
1895         systab.boottime = NULL;
1896
1897         /* Recalculate CRC32 */
1898         efi_update_table_header_crc32(&systab.hdr);
1899
1900         /* Give the payload some time to boot */
1901         efi_set_watchdog(0);
1902         WATCHDOG_RESET();
1903
1904         return EFI_EXIT(EFI_SUCCESS);
1905 }
1906
1907 /**
1908  * efi_get_next_monotonic_count() - get next value of the counter
1909  * @count: returned value of the counter
1910  *
1911  * This function implements the NextMonotonicCount service.
1912  *
1913  * See the Unified Extensible Firmware Interface (UEFI) specification for
1914  * details.
1915  *
1916  * Return: status code
1917  */
1918 static efi_status_t EFIAPI efi_get_next_monotonic_count(uint64_t *count)
1919 {
1920         static uint64_t mono;
1921
1922         EFI_ENTRY("%p", count);
1923         *count = mono++;
1924         return EFI_EXIT(EFI_SUCCESS);
1925 }
1926
1927 /**
1928  * efi_stall() - sleep
1929  * @microseconds: period to sleep in microseconds
1930  *
1931  * This function implements the Stall service.
1932  *
1933  * See the Unified Extensible Firmware Interface (UEFI) specification for
1934  * details.
1935  *
1936  * Return:  status code
1937  */
1938 static efi_status_t EFIAPI efi_stall(unsigned long microseconds)
1939 {
1940         EFI_ENTRY("%ld", microseconds);
1941         udelay(microseconds);
1942         return EFI_EXIT(EFI_SUCCESS);
1943 }
1944
1945 /**
1946  * efi_set_watchdog_timer() - reset the watchdog timer
1947  * @timeout:       seconds before reset by watchdog
1948  * @watchdog_code: code to be logged when resetting
1949  * @data_size:     size of buffer in bytes
1950  * @watchdog_data: buffer with data describing the reset reason
1951  *
1952  * This function implements the SetWatchdogTimer service.
1953  *
1954  * See the Unified Extensible Firmware Interface (UEFI) specification for
1955  * details.
1956  *
1957  * Return: status code
1958  */
1959 static efi_status_t EFIAPI efi_set_watchdog_timer(unsigned long timeout,
1960                                                   uint64_t watchdog_code,
1961                                                   unsigned long data_size,
1962                                                   uint16_t *watchdog_data)
1963 {
1964         EFI_ENTRY("%ld, 0x%llx, %ld, %p", timeout, watchdog_code,
1965                   data_size, watchdog_data);
1966         return EFI_EXIT(efi_set_watchdog(timeout));
1967 }
1968
1969 /**
1970  * efi_close_protocol() - close a protocol
1971  * @handle:            handle on which the protocol shall be closed
1972  * @protocol:          GUID of the protocol to close
1973  * @agent_handle:      handle of the driver
1974  * @controller_handle: handle of the controller
1975  *
1976  * This function implements the CloseProtocol service.
1977  *
1978  * See the Unified Extensible Firmware Interface (UEFI) specification for
1979  * details.
1980  *
1981  * Return: status code
1982  */
1983 static efi_status_t EFIAPI efi_close_protocol(efi_handle_t handle,
1984                                               const efi_guid_t *protocol,
1985                                               efi_handle_t agent_handle,
1986                                               efi_handle_t controller_handle)
1987 {
1988         struct efi_handler *handler;
1989         struct efi_open_protocol_info_item *item;
1990         struct efi_open_protocol_info_item *pos;
1991         efi_status_t r;
1992
1993         EFI_ENTRY("%p, %pUl, %p, %p", handle, protocol, agent_handle,
1994                   controller_handle);
1995
1996         if (!agent_handle) {
1997                 r = EFI_INVALID_PARAMETER;
1998                 goto out;
1999         }
2000         r = efi_search_protocol(handle, protocol, &handler);
2001         if (r != EFI_SUCCESS)
2002                 goto out;
2003
2004         r = EFI_NOT_FOUND;
2005         list_for_each_entry_safe(item, pos, &handler->open_infos, link) {
2006                 if (item->info.agent_handle == agent_handle &&
2007                     item->info.controller_handle == controller_handle) {
2008                         efi_delete_open_info(item);
2009                         r = EFI_SUCCESS;
2010                         break;
2011                 }
2012         }
2013 out:
2014         return EFI_EXIT(r);
2015 }
2016
2017 /**
2018  * efi_open_protocol_information() - provide information about then open status
2019  *                                   of a protocol on a handle
2020  * @handle:       handle for which the information shall be retrieved
2021  * @protocol:     GUID of the protocol
2022  * @entry_buffer: buffer to receive the open protocol information
2023  * @entry_count:  number of entries available in the buffer
2024  *
2025  * This function implements the OpenProtocolInformation service.
2026  *
2027  * See the Unified Extensible Firmware Interface (UEFI) specification for
2028  * details.
2029  *
2030  * Return: status code
2031  */
2032 static efi_status_t EFIAPI efi_open_protocol_information(
2033                         efi_handle_t handle, const efi_guid_t *protocol,
2034                         struct efi_open_protocol_info_entry **entry_buffer,
2035                         efi_uintn_t *entry_count)
2036 {
2037         unsigned long buffer_size;
2038         unsigned long count;
2039         struct efi_handler *handler;
2040         struct efi_open_protocol_info_item *item;
2041         efi_status_t r;
2042
2043         EFI_ENTRY("%p, %pUl, %p, %p", handle, protocol, entry_buffer,
2044                   entry_count);
2045
2046         /* Check parameters */
2047         if (!entry_buffer) {
2048                 r = EFI_INVALID_PARAMETER;
2049                 goto out;
2050         }
2051         r = efi_search_protocol(handle, protocol, &handler);
2052         if (r != EFI_SUCCESS)
2053                 goto out;
2054
2055         /* Count entries */
2056         count = 0;
2057         list_for_each_entry(item, &handler->open_infos, link) {
2058                 if (item->info.open_count)
2059                         ++count;
2060         }
2061         *entry_count = count;
2062         *entry_buffer = NULL;
2063         if (!count) {
2064                 r = EFI_SUCCESS;
2065                 goto out;
2066         }
2067
2068         /* Copy entries */
2069         buffer_size = count * sizeof(struct efi_open_protocol_info_entry);
2070         r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, buffer_size,
2071                               (void **)entry_buffer);
2072         if (r != EFI_SUCCESS)
2073                 goto out;
2074         list_for_each_entry_reverse(item, &handler->open_infos, link) {
2075                 if (item->info.open_count)
2076                         (*entry_buffer)[--count] = item->info;
2077         }
2078 out:
2079         return EFI_EXIT(r);
2080 }
2081
2082 /**
2083  * efi_protocols_per_handle() - get protocols installed on a handle
2084  * @handle:                handle for which the information is retrieved
2085  * @protocol_buffer:       buffer with protocol GUIDs
2086  * @protocol_buffer_count: number of entries in the buffer
2087  *
2088  * This function implements the ProtocolsPerHandleService.
2089  *
2090  * See the Unified Extensible Firmware Interface (UEFI) specification for
2091  * details.
2092  *
2093  * Return: status code
2094  */
2095 static efi_status_t EFIAPI efi_protocols_per_handle(
2096                         efi_handle_t handle, efi_guid_t ***protocol_buffer,
2097                         efi_uintn_t *protocol_buffer_count)
2098 {
2099         unsigned long buffer_size;
2100         struct efi_object *efiobj;
2101         struct list_head *protocol_handle;
2102         efi_status_t r;
2103
2104         EFI_ENTRY("%p, %p, %p", handle, protocol_buffer,
2105                   protocol_buffer_count);
2106
2107         if (!handle || !protocol_buffer || !protocol_buffer_count)
2108                 return EFI_EXIT(EFI_INVALID_PARAMETER);
2109
2110         *protocol_buffer = NULL;
2111         *protocol_buffer_count = 0;
2112
2113         efiobj = efi_search_obj(handle);
2114         if (!efiobj)
2115                 return EFI_EXIT(EFI_INVALID_PARAMETER);
2116
2117         /* Count protocols */
2118         list_for_each(protocol_handle, &efiobj->protocols) {
2119                 ++*protocol_buffer_count;
2120         }
2121
2122         /* Copy guids */
2123         if (*protocol_buffer_count) {
2124                 size_t j = 0;
2125
2126                 buffer_size = sizeof(efi_guid_t *) * *protocol_buffer_count;
2127                 r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, buffer_size,
2128                                       (void **)protocol_buffer);
2129                 if (r != EFI_SUCCESS)
2130                         return EFI_EXIT(r);
2131                 list_for_each(protocol_handle, &efiobj->protocols) {
2132                         struct efi_handler *protocol;
2133
2134                         protocol = list_entry(protocol_handle,
2135                                               struct efi_handler, link);
2136                         (*protocol_buffer)[j] = (void *)protocol->guid;
2137                         ++j;
2138                 }
2139         }
2140
2141         return EFI_EXIT(EFI_SUCCESS);
2142 }
2143
2144 /**
2145  * efi_locate_handle_buffer() - locate handles implementing a protocol
2146  * @search_type: selection criterion
2147  * @protocol:    GUID of the protocol
2148  * @search_key:  registration key
2149  * @no_handles:  number of returned handles
2150  * @buffer:      buffer with the returned handles
2151  *
2152  * This function implements the LocateHandleBuffer service.
2153  *
2154  * See the Unified Extensible Firmware Interface (UEFI) specification for
2155  * details.
2156  *
2157  * Return: status code
2158  */
2159 static efi_status_t EFIAPI efi_locate_handle_buffer(
2160                         enum efi_locate_search_type search_type,
2161                         const efi_guid_t *protocol, void *search_key,
2162                         efi_uintn_t *no_handles, efi_handle_t **buffer)
2163 {
2164         efi_status_t r;
2165         efi_uintn_t buffer_size = 0;
2166
2167         EFI_ENTRY("%d, %pUl, %p, %p, %p", search_type, protocol, search_key,
2168                   no_handles, buffer);
2169
2170         if (!no_handles || !buffer) {
2171                 r = EFI_INVALID_PARAMETER;
2172                 goto out;
2173         }
2174         *no_handles = 0;
2175         *buffer = NULL;
2176         r = efi_locate_handle(search_type, protocol, search_key, &buffer_size,
2177                               *buffer);
2178         if (r != EFI_BUFFER_TOO_SMALL)
2179                 goto out;
2180         r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, buffer_size,
2181                               (void **)buffer);
2182         if (r != EFI_SUCCESS)
2183                 goto out;
2184         r = efi_locate_handle(search_type, protocol, search_key, &buffer_size,
2185                               *buffer);
2186         if (r == EFI_SUCCESS)
2187                 *no_handles = buffer_size / sizeof(efi_handle_t);
2188 out:
2189         return EFI_EXIT(r);
2190 }
2191
2192 /**
2193  * efi_locate_protocol() - find an interface implementing a protocol
2194  * @protocol:           GUID of the protocol
2195  * @registration:       registration key passed to the notification function
2196  * @protocol_interface: interface implementing the protocol
2197  *
2198  * This function implements the LocateProtocol service.
2199  *
2200  * See the Unified Extensible Firmware Interface (UEFI) specification for
2201  * details.
2202  *
2203  * Return: status code
2204  */
2205 static efi_status_t EFIAPI efi_locate_protocol(const efi_guid_t *protocol,
2206                                                void *registration,
2207                                                void **protocol_interface)
2208 {
2209         struct list_head *lhandle;
2210         efi_status_t ret;
2211
2212         EFI_ENTRY("%pUl, %p, %p", protocol, registration, protocol_interface);
2213
2214         if (!protocol || !protocol_interface)
2215                 return EFI_EXIT(EFI_INVALID_PARAMETER);
2216
2217         list_for_each(lhandle, &efi_obj_list) {
2218                 struct efi_object *efiobj;
2219                 struct efi_handler *handler;
2220
2221                 efiobj = list_entry(lhandle, struct efi_object, link);
2222
2223                 ret = efi_search_protocol(efiobj->handle, protocol, &handler);
2224                 if (ret == EFI_SUCCESS) {
2225                         *protocol_interface = handler->protocol_interface;
2226                         return EFI_EXIT(EFI_SUCCESS);
2227                 }
2228         }
2229         *protocol_interface = NULL;
2230
2231         return EFI_EXIT(EFI_NOT_FOUND);
2232 }
2233
2234 /**
2235  * efi_locate_device_path() - Get the device path and handle of an device
2236  *                            implementing a protocol
2237  * @protocol:    GUID of the protocol
2238  * @device_path: device path
2239  * @device:      handle of the device
2240  *
2241  * This function implements the LocateDevicePath service.
2242  *
2243  * See the Unified Extensible Firmware Interface (UEFI) specification for
2244  * details.
2245  *
2246  * Return: status code
2247  */
2248 static efi_status_t EFIAPI efi_locate_device_path(
2249                         const efi_guid_t *protocol,
2250                         struct efi_device_path **device_path,
2251                         efi_handle_t *device)
2252 {
2253         struct efi_device_path *dp;
2254         size_t i;
2255         struct efi_handler *handler;
2256         efi_handle_t *handles;
2257         size_t len, len_dp;
2258         size_t len_best = 0;
2259         efi_uintn_t no_handles;
2260         u8 *remainder;
2261         efi_status_t ret;
2262
2263         EFI_ENTRY("%pUl, %p, %p", protocol, device_path, device);
2264
2265         if (!protocol || !device_path || !*device_path || !device) {
2266                 ret = EFI_INVALID_PARAMETER;
2267                 goto out;
2268         }
2269
2270         /* Find end of device path */
2271         len = efi_dp_instance_size(*device_path);
2272
2273         /* Get all handles implementing the protocol */
2274         ret = EFI_CALL(efi_locate_handle_buffer(BY_PROTOCOL, protocol, NULL,
2275                                                 &no_handles, &handles));
2276         if (ret != EFI_SUCCESS)
2277                 goto out;
2278
2279         for (i = 0; i < no_handles; ++i) {
2280                 /* Find the device path protocol */
2281                 ret = efi_search_protocol(handles[i], &efi_guid_device_path,
2282                                           &handler);
2283                 if (ret != EFI_SUCCESS)
2284                         continue;
2285                 dp = (struct efi_device_path *)handler->protocol_interface;
2286                 len_dp = efi_dp_instance_size(dp);
2287                 /*
2288                  * This handle can only be a better fit
2289                  * if its device path length is longer than the best fit and
2290                  * if its device path length is shorter of equal the searched
2291                  * device path.
2292                  */
2293                 if (len_dp <= len_best || len_dp > len)
2294                         continue;
2295                 /* Check if dp is a subpath of device_path */
2296                 if (memcmp(*device_path, dp, len_dp))
2297                         continue;
2298                 *device = handles[i];
2299                 len_best = len_dp;
2300         }
2301         if (len_best) {
2302                 remainder = (u8 *)*device_path + len_best;
2303                 *device_path = (struct efi_device_path *)remainder;
2304                 ret = EFI_SUCCESS;
2305         } else {
2306                 ret = EFI_NOT_FOUND;
2307         }
2308 out:
2309         return EFI_EXIT(ret);
2310 }
2311
2312 /**
2313  * efi_install_multiple_protocol_interfaces() - Install multiple protocol
2314  *                                              interfaces
2315  * @handle: handle on which the protocol interfaces shall be installed
2316  * @...:    NULL terminated argument list with pairs of protocol GUIDS and
2317  *          interfaces
2318  *
2319  * This function implements the MultipleProtocolInterfaces service.
2320  *
2321  * See the Unified Extensible Firmware Interface (UEFI) specification for
2322  * details.
2323  *
2324  * Return: status code
2325  */
2326 static efi_status_t EFIAPI efi_install_multiple_protocol_interfaces(
2327                         void **handle, ...)
2328 {
2329         EFI_ENTRY("%p", handle);
2330
2331         efi_va_list argptr;
2332         const efi_guid_t *protocol;
2333         void *protocol_interface;
2334         efi_status_t r = EFI_SUCCESS;
2335         int i = 0;
2336
2337         if (!handle)
2338                 return EFI_EXIT(EFI_INVALID_PARAMETER);
2339
2340         efi_va_start(argptr, handle);
2341         for (;;) {
2342                 protocol = efi_va_arg(argptr, efi_guid_t*);
2343                 if (!protocol)
2344                         break;
2345                 protocol_interface = efi_va_arg(argptr, void*);
2346                 r = EFI_CALL(efi_install_protocol_interface(
2347                                                 handle, protocol,
2348                                                 EFI_NATIVE_INTERFACE,
2349                                                 protocol_interface));
2350                 if (r != EFI_SUCCESS)
2351                         break;
2352                 i++;
2353         }
2354         efi_va_end(argptr);
2355         if (r == EFI_SUCCESS)
2356                 return EFI_EXIT(r);
2357
2358         /* If an error occurred undo all changes. */
2359         efi_va_start(argptr, handle);
2360         for (; i; --i) {
2361                 protocol = efi_va_arg(argptr, efi_guid_t*);
2362                 protocol_interface = efi_va_arg(argptr, void*);
2363                 EFI_CALL(efi_uninstall_protocol_interface(handle, protocol,
2364                                                           protocol_interface));
2365         }
2366         efi_va_end(argptr);
2367
2368         return EFI_EXIT(r);
2369 }
2370
2371 /**
2372  * efi_uninstall_multiple_protocol_interfaces() - uninstall multiple protocol
2373  *                                                interfaces
2374  * @handle: handle from which the protocol interfaces shall be removed
2375  * @...:    NULL terminated argument list with pairs of protocol GUIDS and
2376  *          interfaces
2377  *
2378  * This function implements the UninstallMultipleProtocolInterfaces service.
2379  *
2380  * See the Unified Extensible Firmware Interface (UEFI) specification for
2381  * details.
2382  *
2383  * Return: status code
2384  */
2385 static efi_status_t EFIAPI efi_uninstall_multiple_protocol_interfaces(
2386                         void *handle, ...)
2387 {
2388         EFI_ENTRY("%p", handle);
2389
2390         efi_va_list argptr;
2391         const efi_guid_t *protocol;
2392         void *protocol_interface;
2393         efi_status_t r = EFI_SUCCESS;
2394         size_t i = 0;
2395
2396         if (!handle)
2397                 return EFI_EXIT(EFI_INVALID_PARAMETER);
2398
2399         efi_va_start(argptr, handle);
2400         for (;;) {
2401                 protocol = efi_va_arg(argptr, efi_guid_t*);
2402                 if (!protocol)
2403                         break;
2404                 protocol_interface = efi_va_arg(argptr, void*);
2405                 r = EFI_CALL(efi_uninstall_protocol_interface(
2406                                                 handle, protocol,
2407                                                 protocol_interface));
2408                 if (r != EFI_SUCCESS)
2409                         break;
2410                 i++;
2411         }
2412         efi_va_end(argptr);
2413         if (r == EFI_SUCCESS)
2414                 return EFI_EXIT(r);
2415
2416         /* If an error occurred undo all changes. */
2417         efi_va_start(argptr, handle);
2418         for (; i; --i) {
2419                 protocol = efi_va_arg(argptr, efi_guid_t*);
2420                 protocol_interface = efi_va_arg(argptr, void*);
2421                 EFI_CALL(efi_install_protocol_interface(&handle, protocol,
2422                                                         EFI_NATIVE_INTERFACE,
2423                                                         protocol_interface));
2424         }
2425         efi_va_end(argptr);
2426
2427         return EFI_EXIT(r);
2428 }
2429
2430 /**
2431  * efi_calculate_crc32() - calculate cyclic redundancy code
2432  * @data:      buffer with data
2433  * @data_size: size of buffer in bytes
2434  * @crc32_p:   cyclic redundancy code
2435  *
2436  * This function implements the CalculateCrc32 service.
2437  *
2438  * See the Unified Extensible Firmware Interface (UEFI) specification for
2439  * details.
2440  *
2441  * Return: status code
2442  */
2443 static efi_status_t EFIAPI efi_calculate_crc32(const void *data,
2444                                                efi_uintn_t data_size,
2445                                                u32 *crc32_p)
2446 {
2447         EFI_ENTRY("%p, %zu", data, data_size);
2448         *crc32_p = crc32(0, data, data_size);
2449         return EFI_EXIT(EFI_SUCCESS);
2450 }
2451
2452 /**
2453  * efi_copy_mem() - copy memory
2454  * @destination: destination of the copy operation
2455  * @source:      source of the copy operation
2456  * @length:      number of bytes to copy
2457  *
2458  * This function implements the CopyMem service.
2459  *
2460  * See the Unified Extensible Firmware Interface (UEFI) specification for
2461  * details.
2462  */
2463 static void EFIAPI efi_copy_mem(void *destination, const void *source,
2464                                 size_t length)
2465 {
2466         EFI_ENTRY("%p, %p, %ld", destination, source, (unsigned long)length);
2467         memcpy(destination, source, length);
2468         EFI_EXIT(EFI_SUCCESS);
2469 }
2470
2471 /**
2472  * efi_set_mem() - Fill memory with a byte value.
2473  * @buffer: buffer to fill
2474  * @size:   size of buffer in bytes
2475  * @value:  byte to copy to the buffer
2476  *
2477  * This function implements the SetMem service.
2478  *
2479  * See the Unified Extensible Firmware Interface (UEFI) specification for
2480  * details.
2481  */
2482 static void EFIAPI efi_set_mem(void *buffer, size_t size, uint8_t value)
2483 {
2484         EFI_ENTRY("%p, %ld, 0x%x", buffer, (unsigned long)size, value);
2485         memset(buffer, value, size);
2486         EFI_EXIT(EFI_SUCCESS);
2487 }
2488
2489 /**
2490  * efi_protocol_open() - open protocol interface on a handle
2491  * @handler:            handler of a protocol
2492  * @protocol_interface: interface implementing the protocol
2493  * @agent_handle:       handle of the driver
2494  * @controller_handle:  handle of the controller
2495  * @attributes:         attributes indicating how to open the protocol
2496  *
2497  * Return: status code
2498  */
2499 static efi_status_t efi_protocol_open(
2500                         struct efi_handler *handler,
2501                         void **protocol_interface, void *agent_handle,
2502                         void *controller_handle, uint32_t attributes)
2503 {
2504         struct efi_open_protocol_info_item *item;
2505         struct efi_open_protocol_info_entry *match = NULL;
2506         bool opened_by_driver = false;
2507         bool opened_exclusive = false;
2508
2509         /* If there is no agent, only return the interface */
2510         if (!agent_handle)
2511                 goto out;
2512
2513         /* For TEST_PROTOCOL ignore interface attribute */
2514         if (attributes != EFI_OPEN_PROTOCOL_TEST_PROTOCOL)
2515                 *protocol_interface = NULL;
2516
2517         /*
2518          * Check if the protocol is already opened by a driver with the same
2519          * attributes or opened exclusively
2520          */
2521         list_for_each_entry(item, &handler->open_infos, link) {
2522                 if (item->info.agent_handle == agent_handle) {
2523                         if ((attributes & EFI_OPEN_PROTOCOL_BY_DRIVER) &&
2524                             (item->info.attributes == attributes))
2525                                 return EFI_ALREADY_STARTED;
2526                 }
2527                 if (item->info.attributes & EFI_OPEN_PROTOCOL_EXCLUSIVE)
2528                         opened_exclusive = true;
2529         }
2530
2531         /* Only one controller can open the protocol exclusively */
2532         if (opened_exclusive && attributes &
2533             (EFI_OPEN_PROTOCOL_EXCLUSIVE | EFI_OPEN_PROTOCOL_BY_DRIVER))
2534                 return EFI_ACCESS_DENIED;
2535
2536         /* Prepare exclusive opening */
2537         if (attributes & EFI_OPEN_PROTOCOL_EXCLUSIVE) {
2538                 /* Try to disconnect controllers */
2539                 list_for_each_entry(item, &handler->open_infos, link) {
2540                         if (item->info.attributes ==
2541                                         EFI_OPEN_PROTOCOL_BY_DRIVER)
2542                                 EFI_CALL(efi_disconnect_controller(
2543                                                 item->info.controller_handle,
2544                                                 item->info.agent_handle,
2545                                                 NULL));
2546                 }
2547                 opened_by_driver = false;
2548                 /* Check if all controllers are disconnected */
2549                 list_for_each_entry(item, &handler->open_infos, link) {
2550                         if (item->info.attributes & EFI_OPEN_PROTOCOL_BY_DRIVER)
2551                                 opened_by_driver = true;
2552                 }
2553                 /* Only one controller can be conncected */
2554                 if (opened_by_driver)
2555                         return EFI_ACCESS_DENIED;
2556         }
2557
2558         /* Find existing entry */
2559         list_for_each_entry(item, &handler->open_infos, link) {
2560                 if (item->info.agent_handle == agent_handle &&
2561                     item->info.controller_handle == controller_handle)
2562                         match = &item->info;
2563         }
2564         /* None found, create one */
2565         if (!match) {
2566                 match = efi_create_open_info(handler);
2567                 if (!match)
2568                         return EFI_OUT_OF_RESOURCES;
2569         }
2570
2571         match->agent_handle = agent_handle;
2572         match->controller_handle = controller_handle;
2573         match->attributes = attributes;
2574         match->open_count++;
2575
2576 out:
2577         /* For TEST_PROTOCOL ignore interface attribute. */
2578         if (attributes != EFI_OPEN_PROTOCOL_TEST_PROTOCOL)
2579                 *protocol_interface = handler->protocol_interface;
2580
2581         return EFI_SUCCESS;
2582 }
2583
2584 /**
2585  * efi_open_protocol() - open protocol interface on a handle
2586  * @handle:             handle on which the protocol shall be opened
2587  * @protocol:           GUID of the protocol
2588  * @protocol_interface: interface implementing the protocol
2589  * @agent_handle:       handle of the driver
2590  * @controller_handle:  handle of the controller
2591  * @attributes:         attributes indicating how to open the protocol
2592  *
2593  * This function implements the OpenProtocol interface.
2594  *
2595  * See the Unified Extensible Firmware Interface (UEFI) specification for
2596  * details.
2597  *
2598  * Return: status code
2599  */
2600 static efi_status_t EFIAPI efi_open_protocol(
2601                         void *handle, const efi_guid_t *protocol,
2602                         void **protocol_interface, void *agent_handle,
2603                         void *controller_handle, uint32_t attributes)
2604 {
2605         struct efi_handler *handler;
2606         efi_status_t r = EFI_INVALID_PARAMETER;
2607
2608         EFI_ENTRY("%p, %pUl, %p, %p, %p, 0x%x", handle, protocol,
2609                   protocol_interface, agent_handle, controller_handle,
2610                   attributes);
2611
2612         if (!handle || !protocol ||
2613             (!protocol_interface && attributes !=
2614              EFI_OPEN_PROTOCOL_TEST_PROTOCOL)) {
2615                 goto out;
2616         }
2617
2618         switch (attributes) {
2619         case EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL:
2620         case EFI_OPEN_PROTOCOL_GET_PROTOCOL:
2621         case EFI_OPEN_PROTOCOL_TEST_PROTOCOL:
2622                 break;
2623         case EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER:
2624                 if (controller_handle == handle)
2625                         goto out;
2626                 /* fall-through */
2627         case EFI_OPEN_PROTOCOL_BY_DRIVER:
2628         case EFI_OPEN_PROTOCOL_BY_DRIVER | EFI_OPEN_PROTOCOL_EXCLUSIVE:
2629                 /* Check that the controller handle is valid */
2630                 if (!efi_search_obj(controller_handle))
2631                         goto out;
2632                 /* fall-through */
2633         case EFI_OPEN_PROTOCOL_EXCLUSIVE:
2634                 /* Check that the agent handle is valid */
2635                 if (!efi_search_obj(agent_handle))
2636                         goto out;
2637                 break;
2638         default:
2639                 goto out;
2640         }
2641
2642         r = efi_search_protocol(handle, protocol, &handler);
2643         if (r != EFI_SUCCESS)
2644                 goto out;
2645
2646         r = efi_protocol_open(handler, protocol_interface, agent_handle,
2647                               controller_handle, attributes);
2648 out:
2649         return EFI_EXIT(r);
2650 }
2651
2652 /**
2653  * efi_handle_protocol() - get interface of a protocol on a handle
2654  * @handle:             handle on which the protocol shall be opened
2655  * @protocol:           GUID of the protocol
2656  * @protocol_interface: interface implementing the protocol
2657  *
2658  * This function implements the HandleProtocol service.
2659  *
2660  * See the Unified Extensible Firmware Interface (UEFI) specification for
2661  * details.
2662  *
2663  * Return: status code
2664  */
2665 static efi_status_t EFIAPI efi_handle_protocol(efi_handle_t handle,
2666                                                const efi_guid_t *protocol,
2667                                                void **protocol_interface)
2668 {
2669         return efi_open_protocol(handle, protocol, protocol_interface, NULL,
2670                                  NULL, EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL);
2671 }
2672
2673 /**
2674  * efi_bind_controller() - bind a single driver to a controller
2675  * @controller_handle:   controller handle
2676  * @driver_image_handle: driver handle
2677  * @remain_device_path:  remaining path
2678  *
2679  * Return: status code
2680  */
2681 static efi_status_t efi_bind_controller(
2682                         efi_handle_t controller_handle,
2683                         efi_handle_t driver_image_handle,
2684                         struct efi_device_path *remain_device_path)
2685 {
2686         struct efi_driver_binding_protocol *binding_protocol;
2687         efi_status_t r;
2688
2689         r = EFI_CALL(efi_open_protocol(driver_image_handle,
2690                                        &efi_guid_driver_binding_protocol,
2691                                        (void **)&binding_protocol,
2692                                        driver_image_handle, NULL,
2693                                        EFI_OPEN_PROTOCOL_GET_PROTOCOL));
2694         if (r != EFI_SUCCESS)
2695                 return r;
2696         r = EFI_CALL(binding_protocol->supported(binding_protocol,
2697                                                  controller_handle,
2698                                                  remain_device_path));
2699         if (r == EFI_SUCCESS)
2700                 r = EFI_CALL(binding_protocol->start(binding_protocol,
2701                                                      controller_handle,
2702                                                      remain_device_path));
2703         EFI_CALL(efi_close_protocol(driver_image_handle,
2704                                     &efi_guid_driver_binding_protocol,
2705                                     driver_image_handle, NULL));
2706         return r;
2707 }
2708
2709 /**
2710  * efi_connect_single_controller() - connect a single driver to a controller
2711  * @controller_handle:   controller
2712  * @driver_image_handle: driver
2713  * @remain_device_path:  remainting path
2714  *
2715  * Return: status code
2716  */
2717 static efi_status_t efi_connect_single_controller(
2718                         efi_handle_t controller_handle,
2719                         efi_handle_t *driver_image_handle,
2720                         struct efi_device_path *remain_device_path)
2721 {
2722         efi_handle_t *buffer;
2723         size_t count;
2724         size_t i;
2725         efi_status_t r;
2726         size_t connected = 0;
2727
2728         /* Get buffer with all handles with driver binding protocol */
2729         r = EFI_CALL(efi_locate_handle_buffer(BY_PROTOCOL,
2730                                               &efi_guid_driver_binding_protocol,
2731                                               NULL, &count, &buffer));
2732         if (r != EFI_SUCCESS)
2733                 return r;
2734
2735         /*  Context Override */
2736         if (driver_image_handle) {
2737                 for (; *driver_image_handle; ++driver_image_handle) {
2738                         for (i = 0; i < count; ++i) {
2739                                 if (buffer[i] == *driver_image_handle) {
2740                                         buffer[i] = NULL;
2741                                         r = efi_bind_controller(
2742                                                         controller_handle,
2743                                                         *driver_image_handle,
2744                                                         remain_device_path);
2745                                         /*
2746                                          * For drivers that do not support the
2747                                          * controller or are already connected
2748                                          * we receive an error code here.
2749                                          */
2750                                         if (r == EFI_SUCCESS)
2751                                                 ++connected;
2752                                 }
2753                         }
2754                 }
2755         }
2756
2757         /*
2758          * TODO: Some overrides are not yet implemented:
2759          * - Platform Driver Override
2760          * - Driver Family Override Search
2761          * - Bus Specific Driver Override
2762          */
2763
2764         /* Driver Binding Search */
2765         for (i = 0; i < count; ++i) {
2766                 if (buffer[i]) {
2767                         r = efi_bind_controller(controller_handle,
2768                                                 buffer[i],
2769                                                 remain_device_path);
2770                         if (r == EFI_SUCCESS)
2771                                 ++connected;
2772                 }
2773         }
2774
2775         efi_free_pool(buffer);
2776         if (!connected)
2777                 return EFI_NOT_FOUND;
2778         return EFI_SUCCESS;
2779 }
2780
2781 /**
2782  * efi_connect_controller() - connect a controller to a driver
2783  * @controller_handle:   handle of the controller
2784  * @driver_image_handle: handle of the driver
2785  * @remain_device_path:  device path of a child controller
2786  * @recursive:           true to connect all child controllers
2787  *
2788  * This function implements the ConnectController service.
2789  *
2790  * See the Unified Extensible Firmware Interface (UEFI) specification for
2791  * details.
2792  *
2793  * First all driver binding protocol handles are tried for binding drivers.
2794  * Afterwards all handles that have openened a protocol of the controller
2795  * with EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER are connected to drivers.
2796  *
2797  * Return: status code
2798  */
2799 static efi_status_t EFIAPI efi_connect_controller(
2800                         efi_handle_t controller_handle,
2801                         efi_handle_t *driver_image_handle,
2802                         struct efi_device_path *remain_device_path,
2803                         bool recursive)
2804 {
2805         efi_status_t r;
2806         efi_status_t ret = EFI_NOT_FOUND;
2807         struct efi_object *efiobj;
2808
2809         EFI_ENTRY("%p, %p, %p, %d", controller_handle, driver_image_handle,
2810                   remain_device_path, recursive);
2811
2812         efiobj = efi_search_obj(controller_handle);
2813         if (!efiobj) {
2814                 ret = EFI_INVALID_PARAMETER;
2815                 goto out;
2816         }
2817
2818         r = efi_connect_single_controller(controller_handle,
2819                                           driver_image_handle,
2820                                           remain_device_path);
2821         if (r == EFI_SUCCESS)
2822                 ret = EFI_SUCCESS;
2823         if (recursive) {
2824                 struct efi_handler *handler;
2825                 struct efi_open_protocol_info_item *item;
2826
2827                 list_for_each_entry(handler, &efiobj->protocols, link) {
2828                         list_for_each_entry(item, &handler->open_infos, link) {
2829                                 if (item->info.attributes &
2830                                     EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER) {
2831                                         r = EFI_CALL(efi_connect_controller(
2832                                                 item->info.controller_handle,
2833                                                 driver_image_handle,
2834                                                 remain_device_path,
2835                                                 recursive));
2836                                         if (r == EFI_SUCCESS)
2837                                                 ret = EFI_SUCCESS;
2838                                 }
2839                         }
2840                 }
2841         }
2842         /*  Check for child controller specified by end node */
2843         if (ret != EFI_SUCCESS && remain_device_path &&
2844             remain_device_path->type == DEVICE_PATH_TYPE_END)
2845                 ret = EFI_SUCCESS;
2846 out:
2847         return EFI_EXIT(ret);
2848 }
2849
2850 /**
2851  * efi_reinstall_protocol_interface() - reinstall protocol interface
2852  * @handle:        handle on which the protocol shall be reinstalled
2853  * @protocol:      GUID of the protocol to be installed
2854  * @old_interface: interface to be removed
2855  * @new_interface: interface to be installed
2856  *
2857  * This function implements the ReinstallProtocolInterface service.
2858  *
2859  * See the Unified Extensible Firmware Interface (UEFI) specification for
2860  * details.
2861  *
2862  * The old interface is uninstalled. The new interface is installed.
2863  * Drivers are connected.
2864  *
2865  * Return: status code
2866  */
2867 static efi_status_t EFIAPI efi_reinstall_protocol_interface(
2868                         efi_handle_t handle, const efi_guid_t *protocol,
2869                         void *old_interface, void *new_interface)
2870 {
2871         efi_status_t ret;
2872
2873         EFI_ENTRY("%p, %pUl, %p, %p", handle, protocol, old_interface,
2874                   new_interface);
2875         ret = EFI_CALL(efi_uninstall_protocol_interface(handle, protocol,
2876                                                         old_interface));
2877         if (ret != EFI_SUCCESS)
2878                 goto out;
2879         ret = EFI_CALL(efi_install_protocol_interface(&handle, protocol,
2880                                                       EFI_NATIVE_INTERFACE,
2881                                                       new_interface));
2882         if (ret != EFI_SUCCESS)
2883                 goto out;
2884         /*
2885          * The returned status code has to be ignored.
2886          * Do not create an error if no suitable driver for the handle exists.
2887          */
2888         EFI_CALL(efi_connect_controller(handle, NULL, NULL, true));
2889 out:
2890         return EFI_EXIT(ret);
2891 }
2892
2893 /**
2894  * efi_get_child_controllers() - get all child controllers associated to a driver
2895  * @efiobj:              handle of the controller
2896  * @driver_handle:       handle of the driver
2897  * @number_of_children:  number of child controllers
2898  * @child_handle_buffer: handles of the the child controllers
2899  *
2900  * The allocated buffer has to be freed with free().
2901  *
2902  * Return: status code
2903  */
2904 static efi_status_t efi_get_child_controllers(
2905                                 struct efi_object *efiobj,
2906                                 efi_handle_t driver_handle,
2907                                 efi_uintn_t *number_of_children,
2908                                 efi_handle_t **child_handle_buffer)
2909 {
2910         struct efi_handler *handler;
2911         struct efi_open_protocol_info_item *item;
2912         efi_uintn_t count = 0, i;
2913         bool duplicate;
2914
2915         /* Count all child controller associations */
2916         list_for_each_entry(handler, &efiobj->protocols, link) {
2917                 list_for_each_entry(item, &handler->open_infos, link) {
2918                         if (item->info.agent_handle == driver_handle &&
2919                             item->info.attributes &
2920                             EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER)
2921                                 ++count;
2922                 }
2923         }
2924         /*
2925          * Create buffer. In case of duplicate child controller assignments
2926          * the buffer will be too large. But that does not harm.
2927          */
2928         *number_of_children = 0;
2929         *child_handle_buffer = calloc(count, sizeof(efi_handle_t));
2930         if (!*child_handle_buffer)
2931                 return EFI_OUT_OF_RESOURCES;
2932         /* Copy unique child handles */
2933         list_for_each_entry(handler, &efiobj->protocols, link) {
2934                 list_for_each_entry(item, &handler->open_infos, link) {
2935                         if (item->info.agent_handle == driver_handle &&
2936                             item->info.attributes &
2937                             EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER) {
2938                                 /* Check this is a new child controller */
2939                                 duplicate = false;
2940                                 for (i = 0; i < *number_of_children; ++i) {
2941                                         if ((*child_handle_buffer)[i] ==
2942                                             item->info.controller_handle)
2943                                                 duplicate = true;
2944                                 }
2945                                 /* Copy handle to buffer */
2946                                 if (!duplicate) {
2947                                         i = (*number_of_children)++;
2948                                         (*child_handle_buffer)[i] =
2949                                                 item->info.controller_handle;
2950                                 }
2951                         }
2952                 }
2953         }
2954         return EFI_SUCCESS;
2955 }
2956
2957 /**
2958  * efi_disconnect_controller() - disconnect a controller from a driver
2959  * @controller_handle:   handle of the controller
2960  * @driver_image_handle: handle of the driver
2961  * @child_handle:        handle of the child to destroy
2962  *
2963  * This function implements the DisconnectController service.
2964  *
2965  * See the Unified Extensible Firmware Interface (UEFI) specification for
2966  * details.
2967  *
2968  * Return: status code
2969  */
2970 static efi_status_t EFIAPI efi_disconnect_controller(
2971                                 efi_handle_t controller_handle,
2972                                 efi_handle_t driver_image_handle,
2973                                 efi_handle_t child_handle)
2974 {
2975         struct efi_driver_binding_protocol *binding_protocol;
2976         efi_handle_t *child_handle_buffer = NULL;
2977         size_t number_of_children = 0;
2978         efi_status_t r;
2979         size_t stop_count = 0;
2980         struct efi_object *efiobj;
2981
2982         EFI_ENTRY("%p, %p, %p", controller_handle, driver_image_handle,
2983                   child_handle);
2984
2985         efiobj = efi_search_obj(controller_handle);
2986         if (!efiobj) {
2987                 r = EFI_INVALID_PARAMETER;
2988                 goto out;
2989         }
2990
2991         if (child_handle && !efi_search_obj(child_handle)) {
2992                 r = EFI_INVALID_PARAMETER;
2993                 goto out;
2994         }
2995
2996         /* If no driver handle is supplied, disconnect all drivers */
2997         if (!driver_image_handle) {
2998                 r = efi_disconnect_all_drivers(efiobj, NULL, child_handle);
2999                 goto out;
3000         }
3001
3002         /* Create list of child handles */
3003         if (child_handle) {
3004                 number_of_children = 1;
3005                 child_handle_buffer = &child_handle;
3006         } else {
3007                 efi_get_child_controllers(efiobj,
3008                                           driver_image_handle,
3009                                           &number_of_children,
3010                                           &child_handle_buffer);
3011         }
3012
3013         /* Get the driver binding protocol */
3014         r = EFI_CALL(efi_open_protocol(driver_image_handle,
3015                                        &efi_guid_driver_binding_protocol,
3016                                        (void **)&binding_protocol,
3017                                        driver_image_handle, NULL,
3018                                        EFI_OPEN_PROTOCOL_GET_PROTOCOL));
3019         if (r != EFI_SUCCESS)
3020                 goto out;
3021         /* Remove the children */
3022         if (number_of_children) {
3023                 r = EFI_CALL(binding_protocol->stop(binding_protocol,
3024                                                     controller_handle,
3025                                                     number_of_children,
3026                                                     child_handle_buffer));
3027                 if (r == EFI_SUCCESS)
3028                         ++stop_count;
3029         }
3030         /* Remove the driver */
3031         if (!child_handle)
3032                 r = EFI_CALL(binding_protocol->stop(binding_protocol,
3033                                                     controller_handle,
3034                                                     0, NULL));
3035         if (r == EFI_SUCCESS)
3036                 ++stop_count;
3037         EFI_CALL(efi_close_protocol(driver_image_handle,
3038                                     &efi_guid_driver_binding_protocol,
3039                                     driver_image_handle, NULL));
3040
3041         if (stop_count)
3042                 r = EFI_SUCCESS;
3043         else
3044                 r = EFI_NOT_FOUND;
3045 out:
3046         if (!child_handle)
3047                 free(child_handle_buffer);
3048         return EFI_EXIT(r);
3049 }
3050
3051 static struct efi_boot_services efi_boot_services = {
3052         .hdr = {
3053                 .signature = EFI_BOOT_SERVICES_SIGNATURE,
3054                 .revision = EFI_SPECIFICATION_VERSION,
3055                 .headersize = sizeof(struct efi_boot_services),
3056         },
3057         .raise_tpl = efi_raise_tpl,
3058         .restore_tpl = efi_restore_tpl,
3059         .allocate_pages = efi_allocate_pages_ext,
3060         .free_pages = efi_free_pages_ext,
3061         .get_memory_map = efi_get_memory_map_ext,
3062         .allocate_pool = efi_allocate_pool_ext,
3063         .free_pool = efi_free_pool_ext,
3064         .create_event = efi_create_event_ext,
3065         .set_timer = efi_set_timer_ext,
3066         .wait_for_event = efi_wait_for_event,
3067         .signal_event = efi_signal_event_ext,
3068         .close_event = efi_close_event,
3069         .check_event = efi_check_event,
3070         .install_protocol_interface = efi_install_protocol_interface,
3071         .reinstall_protocol_interface = efi_reinstall_protocol_interface,
3072         .uninstall_protocol_interface = efi_uninstall_protocol_interface,
3073         .handle_protocol = efi_handle_protocol,
3074         .reserved = NULL,
3075         .register_protocol_notify = efi_register_protocol_notify,
3076         .locate_handle = efi_locate_handle_ext,
3077         .locate_device_path = efi_locate_device_path,
3078         .install_configuration_table = efi_install_configuration_table_ext,
3079         .load_image = efi_load_image,
3080         .start_image = efi_start_image,
3081         .exit = efi_exit,
3082         .unload_image = efi_unload_image,
3083         .exit_boot_services = efi_exit_boot_services,
3084         .get_next_monotonic_count = efi_get_next_monotonic_count,
3085         .stall = efi_stall,
3086         .set_watchdog_timer = efi_set_watchdog_timer,
3087         .connect_controller = efi_connect_controller,
3088         .disconnect_controller = efi_disconnect_controller,
3089         .open_protocol = efi_open_protocol,
3090         .close_protocol = efi_close_protocol,
3091         .open_protocol_information = efi_open_protocol_information,
3092         .protocols_per_handle = efi_protocols_per_handle,
3093         .locate_handle_buffer = efi_locate_handle_buffer,
3094         .locate_protocol = efi_locate_protocol,
3095         .install_multiple_protocol_interfaces =
3096                         efi_install_multiple_protocol_interfaces,
3097         .uninstall_multiple_protocol_interfaces =
3098                         efi_uninstall_multiple_protocol_interfaces,
3099         .calculate_crc32 = efi_calculate_crc32,
3100         .copy_mem = efi_copy_mem,
3101         .set_mem = efi_set_mem,
3102         .create_event_ex = efi_create_event_ex,
3103 };
3104
3105 static u16 __efi_runtime_data firmware_vendor[] = L"Das U-Boot";
3106
3107 struct efi_system_table __efi_runtime_data systab = {
3108         .hdr = {
3109                 .signature = EFI_SYSTEM_TABLE_SIGNATURE,
3110                 .revision = EFI_SPECIFICATION_VERSION,
3111                 .headersize = sizeof(struct efi_system_table),
3112         },
3113         .fw_vendor = firmware_vendor,
3114         .fw_revision = FW_VERSION << 16 | FW_PATCHLEVEL << 8,
3115         .con_in = (void *)&efi_con_in,
3116         .con_out = (void *)&efi_con_out,
3117         .std_err = (void *)&efi_con_out,
3118         .runtime = (void *)&efi_runtime_services,
3119         .boottime = (void *)&efi_boot_services,
3120         .nr_tables = 0,
3121         .tables = NULL,
3122 };
3123
3124 /**
3125  * efi_initialize_system_table() - Initialize system table
3126  *
3127  * Return Value:        status code
3128  */
3129 efi_status_t efi_initialize_system_table(void)
3130 {
3131         efi_status_t ret;
3132
3133         /* Allocate configuration table array */
3134         ret = efi_allocate_pool(EFI_RUNTIME_SERVICES_DATA,
3135                                 EFI_MAX_CONFIGURATION_TABLES *
3136                                 sizeof(struct efi_configuration_table),
3137                                 (void **)&systab.tables);
3138
3139         /* Set crc32 field in table headers */
3140         efi_update_table_header_crc32(&systab.hdr);
3141         efi_update_table_header_crc32(&efi_runtime_services.hdr);
3142         efi_update_table_header_crc32(&efi_boot_services.hdr);
3143
3144         return ret;
3145 }