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