git.sur5r.net Git - u-boot/blob - lib/efi_loader/efi_boottime.c

   1 /*
   2  *  EFI application boot time services
   3  *
   4  *  Copyright (c) 2016 Alexander Graf
   5  *
   6  *  SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <common.h>
  10 #include <efi_loader.h>
  11 #include <malloc.h>
  12 #include <asm/global_data.h>
  13 #include <libfdt_env.h>
  14 #include <u-boot/crc.h>
  15 #include <bootm.h>
  16 #include <inttypes.h>
  17 #include <watchdog.h>
  18
  19 DECLARE_GLOBAL_DATA_PTR;
  20
  21 /* This list contains all the EFI objects our payload has access to */
  22 LIST_HEAD(efi_obj_list);
  23
  24 /*
  25  * If we're running on nasty systems (32bit ARM booting into non-EFI Linux)
  26  * we need to do trickery with caches. Since we don't want to break the EFI
  27  * aware boot path, only apply hacks when loading exiting directly (breaking
  28  * direct Linux EFI booting along the way - oh well).
  29  */
  30 static bool efi_is_direct_boot = true;
  31
  32 /*
  33  * EFI can pass arbitrary additional "tables" containing vendor specific
  34  * information to the payload. One such table is the FDT table which contains
  35  * a pointer to a flattened device tree blob.
  36  *
  37  * In most cases we want to pass an FDT to the payload, so reserve one slot of
  38  * config table space for it. The pointer gets populated by do_bootefi_exec().
  39  */
  40 static struct efi_configuration_table __efi_runtime_data efi_conf_table[2];
  41
  42 #ifdef CONFIG_ARM
  43 /*
  44  * The "gd" pointer lives in a register on ARM and AArch64 that we declare
  45  * fixed when compiling U-Boot. However, the payload does not know about that
  46  * restriction so we need to manually swap its and our view of that register on
  47  * EFI callback entry/exit.
  48  */
  49 static volatile void *efi_gd, *app_gd;
  50 #endif
  51
  52 static int entry_count;
  53 static int nesting_level;
  54
  55 /* Called on every callback entry */
  56 int __efi_entry_check(void)
  57 {
  58         int ret = entry_count++ == 0;
  59 #ifdef CONFIG_ARM
  60         assert(efi_gd);
  61         app_gd = gd;
  62         gd = efi_gd;
  63 #endif
  64         return ret;
  65 }
  66
  67 /* Called on every callback exit */
  68 int __efi_exit_check(void)
  69 {
  70         int ret = --entry_count == 0;
  71 #ifdef CONFIG_ARM
  72         gd = app_gd;
  73 #endif
  74         return ret;
  75 }
  76
  77 /* Called from do_bootefi_exec() */
  78 void efi_save_gd(void)
  79 {
  80 #ifdef CONFIG_ARM
  81         efi_gd = gd;
  82 #endif
  83 }
  84
  85 /*
  86  * Special case handler for error/abort that just forces things back
  87  * to u-boot world so we can dump out an abort msg, without any care
  88  * about returning back to UEFI world.
  89  */
  90 void efi_restore_gd(void)
  91 {
  92 #ifdef CONFIG_ARM
  93         /* Only restore if we're already in EFI context */
  94         if (!efi_gd)
  95                 return;
  96         gd = efi_gd;
  97 #endif
  98 }
  99
 100 /*
 101  * Two spaces per indent level, maxing out at 10.. which ought to be
 102  * enough for anyone ;-)
 103  */
 104 static const char *indent_string(int level)
 105 {
 106         const char *indent = "                    ";
 107         const int max = strlen(indent);
 108         level = min(max, level * 2);
 109         return &indent[max - level];
 110 }
 111
 112 const char *__efi_nesting(void)
 113 {
 114         return indent_string(nesting_level);
 115 }
 116
 117 const char *__efi_nesting_inc(void)
 118 {
 119         return indent_string(nesting_level++);
 120 }
 121
 122 const char *__efi_nesting_dec(void)
 123 {
 124         return indent_string(--nesting_level);
 125 }
 126
 127 /* Low 32 bit */
 128 #define EFI_LOW32(a) (a & 0xFFFFFFFFULL)
 129 /* High 32 bit */
 130 #define EFI_HIGH32(a) (a >> 32)
 131
 132 /*
 133  * 64bit division by 10 implemented as multiplication by 1 / 10
 134  *
 135  * Decimals of one tenth: 0x1 / 0xA = 0x0.19999...
 136  */
 137 #define EFI_TENTH 0x199999999999999A
 138 static u64 efi_div10(u64 a)
 139 {
 140         u64 prod;
 141         u64 rem;
 142         u64 ret;
 143
 144         ret  = EFI_HIGH32(a) * EFI_HIGH32(EFI_TENTH);
 145         prod = EFI_HIGH32(a) * EFI_LOW32(EFI_TENTH);
 146         rem  = EFI_LOW32(prod);
 147         ret += EFI_HIGH32(prod);
 148         prod = EFI_LOW32(a) * EFI_HIGH32(EFI_TENTH);
 149         rem += EFI_LOW32(prod);
 150         ret += EFI_HIGH32(prod);
 151         prod = EFI_LOW32(a) * EFI_LOW32(EFI_TENTH);
 152         rem += EFI_HIGH32(prod);
 153         ret += EFI_HIGH32(rem);
 154         /* Round to nearest integer */
 155         if (rem >= (1 << 31))
 156                 ++ret;
 157         return ret;
 158 }
 159
 160 void efi_signal_event(struct efi_event *event)
 161 {
 162         if (event->signaled)
 163                 return;
 164         event->signaled = 1;
 165         if (event->type & EVT_NOTIFY_SIGNAL) {
 166                 EFI_CALL(event->notify_function(event, event->notify_context));
 167         }
 168 }
 169
 170 static efi_status_t efi_unsupported(const char *funcname)
 171 {
 172         debug("EFI: App called into unimplemented function %s\n", funcname);
 173         return EFI_EXIT(EFI_UNSUPPORTED);
 174 }
 175
 176 static unsigned long EFIAPI efi_raise_tpl(UINTN new_tpl)
 177 {
 178         EFI_ENTRY("0x%zx", new_tpl);
 179         return EFI_EXIT(0);
 180 }
 181
 182 static void EFIAPI efi_restore_tpl(UINTN old_tpl)
 183 {
 184         EFI_ENTRY("0x%zx", old_tpl);
 185         efi_unsupported(__func__);
 186 }
 187
 188 static efi_status_t EFIAPI efi_allocate_pages_ext(int type, int memory_type,
 189                                                   unsigned long pages,
 190                                                   uint64_t *memory)
 191 {
 192         efi_status_t r;
 193
 194         EFI_ENTRY("%d, %d, 0x%lx, %p", type, memory_type, pages, memory);
 195         r = efi_allocate_pages(type, memory_type, pages, memory);
 196         return EFI_EXIT(r);
 197 }
 198
 199 static efi_status_t EFIAPI efi_free_pages_ext(uint64_t memory,
 200                                               unsigned long pages)
 201 {
 202         efi_status_t r;
 203
 204         EFI_ENTRY("%"PRIx64", 0x%lx", memory, pages);
 205         r = efi_free_pages(memory, pages);
 206         return EFI_EXIT(r);
 207 }
 208
 209 static efi_status_t EFIAPI efi_get_memory_map_ext(
 210                                         unsigned long *memory_map_size,
 211                                         struct efi_mem_desc *memory_map,
 212                                         unsigned long *map_key,
 213                                         unsigned long *descriptor_size,
 214                                         uint32_t *descriptor_version)
 215 {
 216         efi_status_t r;
 217
 218         EFI_ENTRY("%p, %p, %p, %p, %p", memory_map_size, memory_map,
 219                   map_key, descriptor_size, descriptor_version);
 220         r = efi_get_memory_map(memory_map_size, memory_map, map_key,
 221                                descriptor_size, descriptor_version);
 222         return EFI_EXIT(r);
 223 }
 224
 225 static efi_status_t EFIAPI efi_allocate_pool_ext(int pool_type,
 226                                                  unsigned long size,
 227                                                  void **buffer)
 228 {
 229         efi_status_t r;
 230
 231         EFI_ENTRY("%d, %ld, %p", pool_type, size, buffer);
 232         r = efi_allocate_pool(pool_type, size, buffer);
 233         return EFI_EXIT(r);
 234 }
 235
 236 static efi_status_t EFIAPI efi_free_pool_ext(void *buffer)
 237 {
 238         efi_status_t r;
 239
 240         EFI_ENTRY("%p", buffer);
 241         r = efi_free_pool(buffer);
 242         return EFI_EXIT(r);
 243 }
 244
 245 /*
 246  * Our event capabilities are very limited. Only a small limited
 247  * number of events is allowed to coexist.
 248  */
 249 static struct efi_event efi_events[16];
 250
 251 efi_status_t efi_create_event(uint32_t type, UINTN notify_tpl,
 252                               void (EFIAPI *notify_function) (
 253                                         struct efi_event *event,
 254                                         void *context),
 255                               void *notify_context, struct efi_event **event)
 256 {
 257         int i;
 258
 259         if (event == NULL)
 260                 return EFI_INVALID_PARAMETER;
 261
 262         if ((type & EVT_NOTIFY_SIGNAL) && (type & EVT_NOTIFY_WAIT))
 263                 return EFI_INVALID_PARAMETER;
 264
 265         if ((type & (EVT_NOTIFY_SIGNAL|EVT_NOTIFY_WAIT)) &&
 266             notify_function == NULL)
 267                 return EFI_INVALID_PARAMETER;
 268
 269         for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
 270                 if (efi_events[i].type)
 271                         continue;
 272                 efi_events[i].type = type;
 273                 efi_events[i].notify_tpl = notify_tpl;
 274                 efi_events[i].notify_function = notify_function;
 275                 efi_events[i].notify_context = notify_context;
 276                 /* Disable timers on bootup */
 277                 efi_events[i].trigger_next = -1ULL;
 278                 efi_events[i].signaled = 0;
 279                 *event = &efi_events[i];
 280                 return EFI_SUCCESS;
 281         }
 282         return EFI_OUT_OF_RESOURCES;
 283 }
 284
 285 static efi_status_t EFIAPI efi_create_event_ext(
 286                         uint32_t type, UINTN notify_tpl,
 287                         void (EFIAPI *notify_function) (
 288                                         struct efi_event *event,
 289                                         void *context),
 290                         void *notify_context, struct efi_event **event)
 291 {
 292         EFI_ENTRY("%d, 0x%zx, %p, %p", type, notify_tpl, notify_function,
 293                   notify_context);
 294         return EFI_EXIT(efi_create_event(type, notify_tpl, notify_function,
 295                                          notify_context, event));
 296 }
 297
 298
 299 /*
 300  * Our timers have to work without interrupts, so we check whenever keyboard
 301  * input or disk accesses happen if enough time elapsed for it to fire.
 302  */
 303 void efi_timer_check(void)
 304 {
 305         int i;
 306         u64 now = timer_get_us();
 307
 308         for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
 309                 if (!efi_events[i].type ||
 310                     !(efi_events[i].type & EVT_TIMER) ||
 311                     efi_events[i].trigger_type == EFI_TIMER_STOP ||
 312                     now < efi_events[i].trigger_next)
 313                         continue;
 314                 if (efi_events[i].trigger_type == EFI_TIMER_PERIODIC) {
 315                         efi_events[i].trigger_next +=
 316                                 efi_events[i].trigger_time;
 317                         efi_events[i].signaled = 0;
 318                 }
 319                 efi_signal_event(&efi_events[i]);
 320         }
 321         WATCHDOG_RESET();
 322 }
 323
 324 efi_status_t efi_set_timer(struct efi_event *event, enum efi_timer_delay type,
 325                            uint64_t trigger_time)
 326 {
 327         int i;
 328
 329         /*
 330          * The parameter defines a multiple of 100ns.
 331          * We use multiples of 1000ns. So divide by 10.
 332          */
 333         trigger_time = efi_div10(trigger_time);
 334
 335         for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
 336                 if (event != &efi_events[i])
 337                         continue;
 338
 339                 if (!(event->type & EVT_TIMER))
 340                         break;
 341                 switch (type) {
 342                 case EFI_TIMER_STOP:
 343                         event->trigger_next = -1ULL;
 344                         break;
 345                 case EFI_TIMER_PERIODIC:
 346                 case EFI_TIMER_RELATIVE:
 347                         event->trigger_next =
 348                                 timer_get_us() + trigger_time;
 349                         break;
 350                 default:
 351                         return EFI_INVALID_PARAMETER;
 352                 }
 353                 event->trigger_type = type;
 354                 event->trigger_time = trigger_time;
 355                 return EFI_SUCCESS;
 356         }
 357         return EFI_INVALID_PARAMETER;
 358 }
 359
 360 static efi_status_t EFIAPI efi_set_timer_ext(struct efi_event *event,
 361                                              enum efi_timer_delay type,
 362                                              uint64_t trigger_time)
 363 {
 364         EFI_ENTRY("%p, %d, %"PRIx64, event, type, trigger_time);
 365         return EFI_EXIT(efi_set_timer(event, type, trigger_time));
 366 }
 367
 368 static efi_status_t EFIAPI efi_wait_for_event(unsigned long num_events,
 369                                               struct efi_event **event,
 370                                               unsigned long *index)
 371 {
 372         int i, j;
 373
 374         EFI_ENTRY("%ld, %p, %p", num_events, event, index);
 375
 376         /* Check parameters */
 377         if (!num_events || !event)
 378                 return EFI_EXIT(EFI_INVALID_PARAMETER);
 379         for (i = 0; i < num_events; ++i) {
 380                 for (j = 0; j < ARRAY_SIZE(efi_events); ++j) {
 381                         if (event[i] == &efi_events[j])
 382                                 goto known_event;
 383                 }
 384                 return EFI_EXIT(EFI_INVALID_PARAMETER);
 385 known_event:
 386                 if (!event[i]->type || event[i]->type & EVT_NOTIFY_SIGNAL)
 387                         return EFI_EXIT(EFI_INVALID_PARAMETER);
 388         }
 389
 390         /* Wait for signal */
 391         for (;;) {
 392                 for (i = 0; i < num_events; ++i) {
 393                         if (event[i]->signaled)
 394                                 goto out;
 395                 }
 396                 /* Allow events to occur. */
 397                 efi_timer_check();
 398         }
 399
 400 out:
 401         /*
 402          * Reset the signal which is passed to the caller to allow periodic
 403          * events to occur.
 404          */
 405         event[i]->signaled = 0;
 406         if (index)
 407                 *index = i;
 408
 409         return EFI_EXIT(EFI_SUCCESS);
 410 }
 411
 412 static efi_status_t EFIAPI efi_signal_event_ext(struct efi_event *event)
 413 {
 414         int i;
 415
 416         EFI_ENTRY("%p", event);
 417         for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
 418                 if (event != &efi_events[i])
 419                         continue;
 420                 efi_signal_event(event);
 421                 break;
 422         }
 423         return EFI_EXIT(EFI_SUCCESS);
 424 }
 425
 426 static efi_status_t EFIAPI efi_close_event(struct efi_event *event)
 427 {
 428         int i;
 429
 430         EFI_ENTRY("%p", event);
 431         for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
 432                 if (event == &efi_events[i]) {
 433                         event->type = 0;
 434                         event->trigger_next = -1ULL;
 435                         event->signaled = 0;
 436                         return EFI_EXIT(EFI_SUCCESS);
 437                 }
 438         }
 439         return EFI_EXIT(EFI_INVALID_PARAMETER);
 440 }
 441
 442 static efi_status_t EFIAPI efi_check_event(struct efi_event *event)
 443 {
 444         int i;
 445
 446         EFI_ENTRY("%p", event);
 447         efi_timer_check();
 448         for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
 449                 if (event != &efi_events[i])
 450                         continue;
 451                 if (!event->type || event->type & EVT_NOTIFY_SIGNAL)
 452                         break;
 453                 if (event->signaled)
 454                         return EFI_EXIT(EFI_SUCCESS);
 455                 return EFI_EXIT(EFI_NOT_READY);
 456         }
 457         return EFI_EXIT(EFI_INVALID_PARAMETER);
 458 }
 459
 460 static efi_status_t EFIAPI efi_install_protocol_interface(void **handle,
 461                         efi_guid_t *protocol, int protocol_interface_type,
 462                         void *protocol_interface)
 463 {
 464         struct list_head *lhandle;
 465         int i;
 466         efi_status_t r;
 467
 468         if (!handle || !protocol ||
 469             protocol_interface_type != EFI_NATIVE_INTERFACE) {
 470                 r = EFI_INVALID_PARAMETER;
 471                 goto out;
 472         }
 473
 474         /* Create new handle if requested. */
 475         if (!*handle) {
 476                 r = EFI_OUT_OF_RESOURCES;
 477                 goto out;
 478         }
 479         /* Find object. */
 480         list_for_each(lhandle, &efi_obj_list) {
 481                 struct efi_object *efiobj;
 482                 efiobj = list_entry(lhandle, struct efi_object, link);
 483
 484                 if (efiobj->handle != *handle)
 485                         continue;
 486                 /* Check if protocol is already installed on the handle. */
 487                 for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) {
 488                         struct efi_handler *handler = &efiobj->protocols[i];
 489
 490                         if (!handler->guid)
 491                                 continue;
 492                         if (!guidcmp(handler->guid, protocol)) {
 493                                 r = EFI_INVALID_PARAMETER;
 494                                 goto out;
 495                         }
 496                 }
 497                 /* Install protocol in first empty slot. */
 498                 for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) {
 499                         struct efi_handler *handler = &efiobj->protocols[i];
 500
 501                         if (handler->guid)
 502                                 continue;
 503
 504                         handler->guid = protocol;
 505                         handler->protocol_interface = protocol_interface;
 506                         r = EFI_SUCCESS;
 507                         goto out;
 508                 }
 509                 r = EFI_OUT_OF_RESOURCES;
 510                 goto out;
 511         }
 512         r = EFI_INVALID_PARAMETER;
 513 out:
 514         return r;
 515 }
 516
 517 static efi_status_t EFIAPI efi_install_protocol_interface_ext(void **handle,
 518                         efi_guid_t *protocol, int protocol_interface_type,
 519                         void *protocol_interface)
 520 {
 521         EFI_ENTRY("%p, %p, %d, %p", handle, protocol, protocol_interface_type,
 522                   protocol_interface);
 523
 524         return EFI_EXIT(efi_install_protocol_interface(handle, protocol,
 525                                                        protocol_interface_type,
 526                                                        protocol_interface));
 527 }
 528
 529 static efi_status_t EFIAPI efi_reinstall_protocol_interface(void *handle,
 530                         efi_guid_t *protocol, void *old_interface,
 531                         void *new_interface)
 532 {
 533         EFI_ENTRY("%p, %p, %p, %p", handle, protocol, old_interface,
 534                   new_interface);
 535         return EFI_EXIT(EFI_ACCESS_DENIED);
 536 }
 537
 538 static efi_status_t EFIAPI efi_uninstall_protocol_interface(void *handle,
 539                         efi_guid_t *protocol, void *protocol_interface)
 540 {
 541         struct list_head *lhandle;
 542         int i;
 543         efi_status_t r = EFI_NOT_FOUND;
 544
 545         if (!handle || !protocol) {
 546                 r = EFI_INVALID_PARAMETER;
 547                 goto out;
 548         }
 549
 550         list_for_each(lhandle, &efi_obj_list) {
 551                 struct efi_object *efiobj;
 552                 efiobj = list_entry(lhandle, struct efi_object, link);
 553
 554                 if (efiobj->handle != handle)
 555                         continue;
 556
 557                 for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) {
 558                         struct efi_handler *handler = &efiobj->protocols[i];
 559                         const efi_guid_t *hprotocol = handler->guid;
 560
 561                         if (!hprotocol)
 562                                 continue;
 563                         if (!guidcmp(hprotocol, protocol)) {
 564                                 if (handler->protocol_interface) {
 565                                         r = EFI_ACCESS_DENIED;
 566                                 } else {
 567                                         handler->guid = 0;
 568                                         r = EFI_SUCCESS;
 569                                 }
 570                                 goto out;
 571                         }
 572                 }
 573         }
 574
 575 out:
 576         return r;
 577 }
 578
 579 static efi_status_t EFIAPI efi_uninstall_protocol_interface_ext(void *handle,
 580                         efi_guid_t *protocol, void *protocol_interface)
 581 {
 582         EFI_ENTRY("%p, %p, %p", handle, protocol, protocol_interface);
 583
 584         return EFI_EXIT(efi_uninstall_protocol_interface(handle, protocol,
 585                                                          protocol_interface));
 586 }
 587
 588 static efi_status_t EFIAPI efi_register_protocol_notify(efi_guid_t *protocol,
 589                                                         struct efi_event *event,
 590                                                         void **registration)
 591 {
 592         EFI_ENTRY("%p, %p, %p", protocol, event, registration);
 593         return EFI_EXIT(EFI_OUT_OF_RESOURCES);
 594 }
 595
 596 static int efi_search(enum efi_locate_search_type search_type,
 597                       efi_guid_t *protocol, void *search_key,
 598                       struct efi_object *efiobj)
 599 {
 600         int i;
 601
 602         switch (search_type) {
 603         case all_handles:
 604                 return 0;
 605         case by_register_notify:
 606                 return -1;
 607         case by_protocol:
 608                 for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) {
 609                         const efi_guid_t *guid = efiobj->protocols[i].guid;
 610                         if (guid && !guidcmp(guid, protocol))
 611                                 return 0;
 612                 }
 613                 return -1;
 614         }
 615
 616         return -1;
 617 }
 618
 619 static efi_status_t efi_locate_handle(
 620                         enum efi_locate_search_type search_type,
 621                         efi_guid_t *protocol, void *search_key,
 622                         unsigned long *buffer_size, efi_handle_t *buffer)
 623 {
 624         struct list_head *lhandle;
 625         unsigned long size = 0;
 626
 627         /* Count how much space we need */
 628         list_for_each(lhandle, &efi_obj_list) {
 629                 struct efi_object *efiobj;
 630                 efiobj = list_entry(lhandle, struct efi_object, link);
 631                 if (!efi_search(search_type, protocol, search_key, efiobj)) {
 632                         size += sizeof(void*);
 633                 }
 634         }
 635
 636         if (*buffer_size < size) {
 637                 *buffer_size = size;
 638                 return EFI_BUFFER_TOO_SMALL;
 639         }
 640
 641         *buffer_size = size;
 642         if (size == 0)
 643                 return EFI_NOT_FOUND;
 644
 645         /* Then fill the array */
 646         list_for_each(lhandle, &efi_obj_list) {
 647                 struct efi_object *efiobj;
 648                 efiobj = list_entry(lhandle, struct efi_object, link);
 649                 if (!efi_search(search_type, protocol, search_key, efiobj)) {
 650                         *(buffer++) = efiobj->handle;
 651                 }
 652         }
 653
 654         return EFI_SUCCESS;
 655 }
 656
 657 static efi_status_t EFIAPI efi_locate_handle_ext(
 658                         enum efi_locate_search_type search_type,
 659                         efi_guid_t *protocol, void *search_key,
 660                         unsigned long *buffer_size, efi_handle_t *buffer)
 661 {
 662         EFI_ENTRY("%d, %p, %p, %p, %p", search_type, protocol, search_key,
 663                   buffer_size, buffer);
 664
 665         return EFI_EXIT(efi_locate_handle(search_type, protocol, search_key,
 666                         buffer_size, buffer));
 667 }
 668
 669 static efi_status_t EFIAPI efi_locate_device_path(efi_guid_t *protocol,
 670                         struct efi_device_path **device_path,
 671                         efi_handle_t *device)
 672 {
 673         EFI_ENTRY("%p, %p, %p", protocol, device_path, device);
 674         return EFI_EXIT(EFI_NOT_FOUND);
 675 }
 676
 677 /* Collapses configuration table entries, removing index i */
 678 static void efi_remove_configuration_table(int i)
 679 {
 680         struct efi_configuration_table *this = &efi_conf_table[i];
 681         struct efi_configuration_table *next = &efi_conf_table[i+1];
 682         struct efi_configuration_table *end = &efi_conf_table[systab.nr_tables];
 683
 684         memmove(this, next, (ulong)end - (ulong)next);
 685         systab.nr_tables--;
 686 }
 687
 688 efi_status_t efi_install_configuration_table(const efi_guid_t *guid, void *table)
 689 {
 690         int i;
 691
 692         /* Check for guid override */
 693         for (i = 0; i < systab.nr_tables; i++) {
 694                 if (!guidcmp(guid, &efi_conf_table[i].guid)) {
 695                         if (table)
 696                                 efi_conf_table[i].table = table;
 697                         else
 698                                 efi_remove_configuration_table(i);
 699                         return EFI_SUCCESS;
 700                 }
 701         }
 702
 703         if (!table)
 704                 return EFI_NOT_FOUND;
 705
 706         /* No override, check for overflow */
 707         if (i >= ARRAY_SIZE(efi_conf_table))
 708                 return EFI_OUT_OF_RESOURCES;
 709
 710         /* Add a new entry */
 711         memcpy(&efi_conf_table[i].guid, guid, sizeof(*guid));
 712         efi_conf_table[i].table = table;
 713         systab.nr_tables = i + 1;
 714
 715         return EFI_SUCCESS;
 716 }
 717
 718 static efi_status_t EFIAPI efi_install_configuration_table_ext(efi_guid_t *guid,
 719                                                                void *table)
 720 {
 721         EFI_ENTRY("%p, %p", guid, table);
 722         return EFI_EXIT(efi_install_configuration_table(guid, table));
 723 }
 724
 725 static efi_status_t EFIAPI efi_load_image(bool boot_policy,
 726                                           efi_handle_t parent_image,
 727                                           struct efi_device_path *file_path,
 728                                           void *source_buffer,
 729                                           unsigned long source_size,
 730                                           efi_handle_t *image_handle)
 731 {
 732         static struct efi_object loaded_image_info_obj = {
 733                 .protocols = {
 734                         {
 735                                 .guid = &efi_guid_loaded_image,
 736                         },
 737                 },
 738         };
 739         struct efi_loaded_image *info;
 740         struct efi_object *obj;
 741
 742         EFI_ENTRY("%d, %p, %p, %p, %ld, %p", boot_policy, parent_image,
 743                   file_path, source_buffer, source_size, image_handle);
 744         info = malloc(sizeof(*info));
 745         loaded_image_info_obj.protocols[0].protocol_interface = info;
 746         obj = malloc(sizeof(loaded_image_info_obj));
 747         memset(info, 0, sizeof(*info));
 748         memcpy(obj, &loaded_image_info_obj, sizeof(loaded_image_info_obj));
 749         obj->handle = info;
 750         info->file_path = file_path;
 751         info->reserved = efi_load_pe(source_buffer, info);
 752         if (!info->reserved) {
 753                 free(info);
 754                 free(obj);
 755                 return EFI_EXIT(EFI_UNSUPPORTED);
 756         }
 757
 758         *image_handle = info;
 759         list_add_tail(&obj->link, &efi_obj_list);
 760
 761         return EFI_EXIT(EFI_SUCCESS);
 762 }
 763
 764 static efi_status_t EFIAPI efi_start_image(efi_handle_t image_handle,
 765                                            unsigned long *exit_data_size,
 766                                            s16 **exit_data)
 767 {
 768         ulong (*entry)(void *image_handle, struct efi_system_table *st);
 769         struct efi_loaded_image *info = image_handle;
 770
 771         EFI_ENTRY("%p, %p, %p", image_handle, exit_data_size, exit_data);
 772         entry = info->reserved;
 773
 774         efi_is_direct_boot = false;
 775
 776         /* call the image! */
 777         if (setjmp(&info->exit_jmp)) {
 778                 /* We returned from the child image */
 779                 return EFI_EXIT(info->exit_status);
 780         }
 781
 782         __efi_nesting_dec();
 783         __efi_exit_check();
 784         entry(image_handle, &systab);
 785         __efi_entry_check();
 786         __efi_nesting_inc();
 787
 788         /* Should usually never get here */
 789         return EFI_EXIT(EFI_SUCCESS);
 790 }
 791
 792 static efi_status_t EFIAPI efi_exit(efi_handle_t image_handle,
 793                         efi_status_t exit_status, unsigned long exit_data_size,
 794                         int16_t *exit_data)
 795 {
 796         struct efi_loaded_image *loaded_image_info = (void*)image_handle;
 797
 798         EFI_ENTRY("%p, %ld, %ld, %p", image_handle, exit_status,
 799                   exit_data_size, exit_data);
 800
 801         __efi_exit_check();
 802
 803         loaded_image_info->exit_status = exit_status;
 804         longjmp(&loaded_image_info->exit_jmp, 1);
 805
 806         panic("EFI application exited");
 807 }
 808
 809 static struct efi_object *efi_search_obj(void *handle)
 810 {
 811         struct list_head *lhandle;
 812
 813         list_for_each(lhandle, &efi_obj_list) {
 814                 struct efi_object *efiobj;
 815                 efiobj = list_entry(lhandle, struct efi_object, link);
 816                 if (efiobj->handle == handle)
 817                         return efiobj;
 818         }
 819
 820         return NULL;
 821 }
 822
 823 static efi_status_t EFIAPI efi_unload_image(void *image_handle)
 824 {
 825         struct efi_object *efiobj;
 826
 827         EFI_ENTRY("%p", image_handle);
 828         efiobj = efi_search_obj(image_handle);
 829         if (efiobj)
 830                 list_del(&efiobj->link);
 831
 832         return EFI_EXIT(EFI_SUCCESS);
 833 }
 834
 835 static void efi_exit_caches(void)
 836 {
 837 #if defined(CONFIG_ARM) && !defined(CONFIG_ARM64)
 838         /*
 839          * Grub on 32bit ARM needs to have caches disabled before jumping into
 840          * a zImage, but does not know of all cache layers. Give it a hand.
 841          */
 842         if (efi_is_direct_boot)
 843                 cleanup_before_linux();
 844 #endif
 845 }
 846
 847 static efi_status_t EFIAPI efi_exit_boot_services(void *image_handle,
 848                                                   unsigned long map_key)
 849 {
 850         EFI_ENTRY("%p, %ld", image_handle, map_key);
 851
 852         board_quiesce_devices();
 853
 854         /* Fix up caches for EFI payloads if necessary */
 855         efi_exit_caches();
 856
 857         /* This stops all lingering devices */
 858         bootm_disable_interrupts();
 859
 860         /* Give the payload some time to boot */
 861         WATCHDOG_RESET();
 862
 863         return EFI_EXIT(EFI_SUCCESS);
 864 }
 865
 866 static efi_status_t EFIAPI efi_get_next_monotonic_count(uint64_t *count)
 867 {
 868         static uint64_t mono = 0;
 869         EFI_ENTRY("%p", count);
 870         *count = mono++;
 871         return EFI_EXIT(EFI_SUCCESS);
 872 }
 873
 874 static efi_status_t EFIAPI efi_stall(unsigned long microseconds)
 875 {
 876         EFI_ENTRY("%ld", microseconds);
 877         udelay(microseconds);
 878         return EFI_EXIT(EFI_SUCCESS);
 879 }
 880
 881 static efi_status_t EFIAPI efi_set_watchdog_timer(unsigned long timeout,
 882                                                   uint64_t watchdog_code,
 883                                                   unsigned long data_size,
 884                                                   uint16_t *watchdog_data)
 885 {
 886         EFI_ENTRY("%ld, 0x%"PRIx64", %ld, %p", timeout, watchdog_code,
 887                   data_size, watchdog_data);
 888         return efi_unsupported(__func__);
 889 }
 890
 891 static efi_status_t EFIAPI efi_connect_controller(
 892                         efi_handle_t controller_handle,
 893                         efi_handle_t *driver_image_handle,
 894                         struct efi_device_path *remain_device_path,
 895                         bool recursive)
 896 {
 897         EFI_ENTRY("%p, %p, %p, %d", controller_handle, driver_image_handle,
 898                   remain_device_path, recursive);
 899         return EFI_EXIT(EFI_NOT_FOUND);
 900 }
 901
 902 static efi_status_t EFIAPI efi_disconnect_controller(void *controller_handle,
 903                                                      void *driver_image_handle,
 904                                                      void *child_handle)
 905 {
 906         EFI_ENTRY("%p, %p, %p", controller_handle, driver_image_handle,
 907                   child_handle);
 908         return EFI_EXIT(EFI_INVALID_PARAMETER);
 909 }
 910
 911 static efi_status_t EFIAPI efi_close_protocol(void *handle,
 912                                               efi_guid_t *protocol,
 913                                               void *agent_handle,
 914                                               void *controller_handle)
 915 {
 916         EFI_ENTRY("%p, %p, %p, %p", handle, protocol, agent_handle,
 917                   controller_handle);
 918         return EFI_EXIT(EFI_NOT_FOUND);
 919 }
 920
 921 static efi_status_t EFIAPI efi_open_protocol_information(efi_handle_t handle,
 922                         efi_guid_t *protocol,
 923                         struct efi_open_protocol_info_entry **entry_buffer,
 924                         unsigned long *entry_count)
 925 {
 926         EFI_ENTRY("%p, %p, %p, %p", handle, protocol, entry_buffer,
 927                   entry_count);
 928         return EFI_EXIT(EFI_NOT_FOUND);
 929 }
 930
 931 static efi_status_t EFIAPI efi_protocols_per_handle(void *handle,
 932                         efi_guid_t ***protocol_buffer,
 933                         unsigned long *protocol_buffer_count)
 934 {
 935         unsigned long buffer_size;
 936         struct efi_object *efiobj;
 937         unsigned long i, j;
 938         struct list_head *lhandle;
 939         efi_status_t r;
 940
 941         EFI_ENTRY("%p, %p, %p", handle, protocol_buffer,
 942                   protocol_buffer_count);
 943
 944         if (!handle || !protocol_buffer || !protocol_buffer_count)
 945                 return EFI_EXIT(EFI_INVALID_PARAMETER);
 946
 947         *protocol_buffer = NULL;
 948         *protocol_buffer_count = 0;
 949         list_for_each(lhandle, &efi_obj_list) {
 950                 efiobj = list_entry(lhandle, struct efi_object, link);
 951
 952                 if (efiobj->handle != handle)
 953                         continue;
 954
 955                 /* Count protocols */
 956                 for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) {
 957                         if (efiobj->protocols[i].guid)
 958                                 ++*protocol_buffer_count;
 959                 }
 960                 /* Copy guids */
 961                 if (*protocol_buffer_count) {
 962                         buffer_size = sizeof(efi_guid_t *) *
 963                                         *protocol_buffer_count;
 964                         r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES,
 965                                               buffer_size,
 966                                               (void **)protocol_buffer);
 967                         if (r != EFI_SUCCESS)
 968                                 return EFI_EXIT(r);
 969                         j = 0;
 970                         for (i = 0; i < ARRAY_SIZE(efiobj->protocols); ++i) {
 971                                 if (efiobj->protocols[i].guid) {
 972                                         (*protocol_buffer)[j] = (void *)
 973                                                 efiobj->protocols[i].guid;
 974                                         ++j;
 975                                 }
 976                         }
 977                 }
 978                 break;
 979         }
 980
 981         return EFI_EXIT(EFI_SUCCESS);
 982 }
 983
 984 static efi_status_t EFIAPI efi_locate_handle_buffer(
 985                         enum efi_locate_search_type search_type,
 986                         efi_guid_t *protocol, void *search_key,
 987                         unsigned long *no_handles, efi_handle_t **buffer)
 988 {
 989         efi_status_t r;
 990         unsigned long buffer_size = 0;
 991
 992         EFI_ENTRY("%d, %p, %p, %p, %p", search_type, protocol, search_key,
 993                   no_handles, buffer);
 994
 995         if (!no_handles || !buffer) {
 996                 r = EFI_INVALID_PARAMETER;
 997                 goto out;
 998         }
 999         *no_handles = 0;
1000         *buffer = NULL;
1001         r = efi_locate_handle(search_type, protocol, search_key, &buffer_size,
1002                               *buffer);
1003         if (r != EFI_BUFFER_TOO_SMALL)
1004                 goto out;
1005         r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, buffer_size,
1006                               (void **)buffer);
1007         if (r != EFI_SUCCESS)
1008                 goto out;
1009         r = efi_locate_handle(search_type, protocol, search_key, &buffer_size,
1010                               *buffer);
1011         if (r == EFI_SUCCESS)
1012                 *no_handles = buffer_size / sizeof(void *);
1013 out:
1014         return EFI_EXIT(r);
1015 }
1016
1017 static efi_status_t EFIAPI efi_locate_protocol(efi_guid_t *protocol,
1018                                                void *registration,
1019                                                void **protocol_interface)
1020 {
1021         struct list_head *lhandle;
1022         int i;
1023
1024         EFI_ENTRY("%p, %p, %p", protocol, registration, protocol_interface);
1025
1026         if (!protocol || !protocol_interface)
1027                 return EFI_EXIT(EFI_INVALID_PARAMETER);
1028
1029         EFI_PRINT_GUID("protocol", protocol);
1030
1031         list_for_each(lhandle, &efi_obj_list) {
1032                 struct efi_object *efiobj;
1033
1034                 efiobj = list_entry(lhandle, struct efi_object, link);
1035                 for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) {
1036                         struct efi_handler *handler = &efiobj->protocols[i];
1037
1038                         if (!handler->guid)
1039                                 continue;
1040                         if (!guidcmp(handler->guid, protocol)) {
1041                                 *protocol_interface =
1042                                         handler->protocol_interface;
1043                                 return EFI_EXIT(EFI_SUCCESS);
1044                         }
1045                 }
1046         }
1047         *protocol_interface = NULL;
1048
1049         return EFI_EXIT(EFI_NOT_FOUND);
1050 }
1051
1052 static efi_status_t EFIAPI efi_install_multiple_protocol_interfaces(
1053                         void **handle, ...)
1054 {
1055         EFI_ENTRY("%p", handle);
1056
1057         va_list argptr;
1058         efi_guid_t *protocol;
1059         void *protocol_interface;
1060         efi_status_t r = EFI_SUCCESS;
1061         int i = 0;
1062
1063         if (!handle)
1064                 return EFI_EXIT(EFI_INVALID_PARAMETER);
1065
1066         va_start(argptr, handle);
1067         for (;;) {
1068                 protocol = va_arg(argptr, efi_guid_t*);
1069                 if (!protocol)
1070                         break;
1071                 protocol_interface = va_arg(argptr, void*);
1072                 r = efi_install_protocol_interface(handle, protocol,
1073                                                    EFI_NATIVE_INTERFACE,
1074                                                    protocol_interface);
1075                 if (r != EFI_SUCCESS)
1076                         break;
1077                 i++;
1078         }
1079         va_end(argptr);
1080         if (r == EFI_SUCCESS)
1081                 return EFI_EXIT(r);
1082
1083         /* If an error occured undo all changes. */
1084         va_start(argptr, handle);
1085         for (; i; --i) {
1086                 protocol = va_arg(argptr, efi_guid_t*);
1087                 protocol_interface = va_arg(argptr, void*);
1088                 efi_uninstall_protocol_interface(handle, protocol,
1089                                                  protocol_interface);
1090         }
1091         va_end(argptr);
1092
1093         return EFI_EXIT(r);
1094 }
1095
1096 static efi_status_t EFIAPI efi_uninstall_multiple_protocol_interfaces(
1097                         void *handle, ...)
1098 {
1099         EFI_ENTRY("%p", handle);
1100         return EFI_EXIT(EFI_INVALID_PARAMETER);
1101 }
1102
1103 static efi_status_t EFIAPI efi_calculate_crc32(void *data,
1104                                                unsigned long data_size,
1105                                                uint32_t *crc32_p)
1106 {
1107         EFI_ENTRY("%p, %ld", data, data_size);
1108         *crc32_p = crc32(0, data, data_size);
1109         return EFI_EXIT(EFI_SUCCESS);
1110 }
1111
1112 static void EFIAPI efi_copy_mem(void *destination, void *source,
1113                                 unsigned long length)
1114 {
1115         EFI_ENTRY("%p, %p, %ld", destination, source, length);
1116         memcpy(destination, source, length);
1117 }
1118
1119 static void EFIAPI efi_set_mem(void *buffer, unsigned long size, uint8_t value)
1120 {
1121         EFI_ENTRY("%p, %ld, 0x%x", buffer, size, value);
1122         memset(buffer, value, size);
1123 }
1124
1125 static efi_status_t EFIAPI efi_open_protocol(
1126                         void *handle, efi_guid_t *protocol,
1127                         void **protocol_interface, void *agent_handle,
1128                         void *controller_handle, uint32_t attributes)
1129 {
1130         struct list_head *lhandle;
1131         int i;
1132         efi_status_t r = EFI_INVALID_PARAMETER;
1133
1134         EFI_ENTRY("%p, %p, %p, %p, %p, 0x%x", handle, protocol,
1135                   protocol_interface, agent_handle, controller_handle,
1136                   attributes);
1137
1138         if (!handle || !protocol ||
1139             (!protocol_interface && attributes !=
1140              EFI_OPEN_PROTOCOL_TEST_PROTOCOL)) {
1141                 goto out;
1142         }
1143
1144         EFI_PRINT_GUID("protocol", protocol);
1145
1146         switch (attributes) {
1147         case EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL:
1148         case EFI_OPEN_PROTOCOL_GET_PROTOCOL:
1149         case EFI_OPEN_PROTOCOL_TEST_PROTOCOL:
1150                 break;
1151         case EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER:
1152                 if (controller_handle == handle)
1153                         goto out;
1154         case EFI_OPEN_PROTOCOL_BY_DRIVER:
1155         case EFI_OPEN_PROTOCOL_BY_DRIVER | EFI_OPEN_PROTOCOL_EXCLUSIVE:
1156                 if (controller_handle == NULL)
1157                         goto out;
1158         case EFI_OPEN_PROTOCOL_EXCLUSIVE:
1159                 if (agent_handle == NULL)
1160                         goto out;
1161                 break;
1162         default:
1163                 goto out;
1164         }
1165
1166         list_for_each(lhandle, &efi_obj_list) {
1167                 struct efi_object *efiobj;
1168                 efiobj = list_entry(lhandle, struct efi_object, link);
1169
1170                 if (efiobj->handle != handle)
1171                         continue;
1172
1173                 for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) {
1174                         struct efi_handler *handler = &efiobj->protocols[i];
1175                         const efi_guid_t *hprotocol = handler->guid;
1176                         if (!hprotocol)
1177                                 continue;
1178                         if (!guidcmp(hprotocol, protocol)) {
1179                                 if (attributes !=
1180                                     EFI_OPEN_PROTOCOL_TEST_PROTOCOL) {
1181                                         *protocol_interface =
1182                                                 handler->protocol_interface;
1183                                 }
1184                                 r = EFI_SUCCESS;
1185                                 goto out;
1186                         }
1187                 }
1188                 goto unsupported;
1189         }
1190
1191 unsupported:
1192         r = EFI_UNSUPPORTED;
1193 out:
1194         return EFI_EXIT(r);
1195 }
1196
1197 static efi_status_t EFIAPI efi_handle_protocol(void *handle,
1198                                                efi_guid_t *protocol,
1199                                                void **protocol_interface)
1200 {
1201         return efi_open_protocol(handle, protocol, protocol_interface, NULL,
1202                                  NULL, EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL);
1203 }
1204
1205 static const struct efi_boot_services efi_boot_services = {
1206         .hdr = {
1207                 .headersize = sizeof(struct efi_table_hdr),
1208         },
1209         .raise_tpl = efi_raise_tpl,
1210         .restore_tpl = efi_restore_tpl,
1211         .allocate_pages = efi_allocate_pages_ext,
1212         .free_pages = efi_free_pages_ext,
1213         .get_memory_map = efi_get_memory_map_ext,
1214         .allocate_pool = efi_allocate_pool_ext,
1215         .free_pool = efi_free_pool_ext,
1216         .create_event = efi_create_event_ext,
1217         .set_timer = efi_set_timer_ext,
1218         .wait_for_event = efi_wait_for_event,
1219         .signal_event = efi_signal_event_ext,
1220         .close_event = efi_close_event,
1221         .check_event = efi_check_event,
1222         .install_protocol_interface = efi_install_protocol_interface_ext,
1223         .reinstall_protocol_interface = efi_reinstall_protocol_interface,
1224         .uninstall_protocol_interface = efi_uninstall_protocol_interface_ext,
1225         .handle_protocol = efi_handle_protocol,
1226         .reserved = NULL,
1227         .register_protocol_notify = efi_register_protocol_notify,
1228         .locate_handle = efi_locate_handle_ext,
1229         .locate_device_path = efi_locate_device_path,
1230         .install_configuration_table = efi_install_configuration_table_ext,
1231         .load_image = efi_load_image,
1232         .start_image = efi_start_image,
1233         .exit = efi_exit,
1234         .unload_image = efi_unload_image,
1235         .exit_boot_services = efi_exit_boot_services,
1236         .get_next_monotonic_count = efi_get_next_monotonic_count,
1237         .stall = efi_stall,
1238         .set_watchdog_timer = efi_set_watchdog_timer,
1239         .connect_controller = efi_connect_controller,
1240         .disconnect_controller = efi_disconnect_controller,
1241         .open_protocol = efi_open_protocol,
1242         .close_protocol = efi_close_protocol,
1243         .open_protocol_information = efi_open_protocol_information,
1244         .protocols_per_handle = efi_protocols_per_handle,
1245         .locate_handle_buffer = efi_locate_handle_buffer,
1246         .locate_protocol = efi_locate_protocol,
1247         .install_multiple_protocol_interfaces = efi_install_multiple_protocol_interfaces,
1248         .uninstall_multiple_protocol_interfaces = efi_uninstall_multiple_protocol_interfaces,
1249         .calculate_crc32 = efi_calculate_crc32,
1250         .copy_mem = efi_copy_mem,
1251         .set_mem = efi_set_mem,
1252 };
1253
1254
1255 static uint16_t __efi_runtime_data firmware_vendor[] =
1256         { 'D','a','s',' ','U','-','b','o','o','t',0 };
1257
1258 struct efi_system_table __efi_runtime_data systab = {
1259         .hdr = {
1260                 .signature = EFI_SYSTEM_TABLE_SIGNATURE,
1261                 .revision = 0x20005, /* 2.5 */
1262                 .headersize = sizeof(struct efi_table_hdr),
1263         },
1264         .fw_vendor = (long)firmware_vendor,
1265         .con_in = (void*)&efi_con_in,
1266         .con_out = (void*)&efi_con_out,
1267         .std_err = (void*)&efi_con_out,
1268         .runtime = (void*)&efi_runtime_services,
1269         .boottime = (void*)&efi_boot_services,
1270         .nr_tables = 0,
1271         .tables = (void*)efi_conf_table,
1272 };