1 // SPDX-License-Identifier: GPL-2.0-only 2 3 /* ----------------------------------------------------------------------- 4 * 5 * Copyright 2011 Intel Corporation; author Matt Fleming 6 * 7 * ----------------------------------------------------------------------- */ 8 9 #include <linux/efi.h> 10 #include <linux/pci.h> 11 12 #include <asm/efi.h> 13 #include <asm/e820/types.h> 14 #include <asm/setup.h> 15 #include <asm/desc.h> 16 #include <asm/boot.h> 17 18 #include "efistub.h" 19 20 static efi_system_table_t *sys_table; 21 extern const bool efi_is64; 22 23 __pure efi_system_table_t *efi_system_table(void) 24 { 25 return sys_table; 26 } 27 28 __attribute_const__ bool efi_is_64bit(void) 29 { 30 if (IS_ENABLED(CONFIG_EFI_MIXED)) 31 return efi_is64; 32 return IS_ENABLED(CONFIG_X86_64); 33 } 34 35 static efi_status_t 36 preserve_pci_rom_image(efi_pci_io_protocol_t *pci, struct pci_setup_rom **__rom) 37 { 38 struct pci_setup_rom *rom = NULL; 39 efi_status_t status; 40 unsigned long size; 41 uint64_t romsize; 42 void *romimage; 43 44 /* 45 * Some firmware images contain EFI function pointers at the place where 46 * the romimage and romsize fields are supposed to be. Typically the EFI 47 * code is mapped at high addresses, translating to an unrealistically 48 * large romsize. The UEFI spec limits the size of option ROMs to 16 49 * MiB so we reject any ROMs over 16 MiB in size to catch this. 50 */ 51 romimage = efi_table_attr(pci, romimage); 52 romsize = efi_table_attr(pci, romsize); 53 if (!romimage || !romsize || romsize > SZ_16M) 54 return EFI_INVALID_PARAMETER; 55 56 size = romsize + sizeof(*rom); 57 58 status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 59 (void **)&rom); 60 if (status != EFI_SUCCESS) { 61 efi_printk("Failed to allocate memory for 'rom'\n"); 62 return status; 63 } 64 65 memset(rom, 0, sizeof(*rom)); 66 67 rom->data.type = SETUP_PCI; 68 rom->data.len = size - sizeof(struct setup_data); 69 rom->data.next = 0; 70 rom->pcilen = pci->romsize; 71 *__rom = rom; 72 73 status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16, 74 PCI_VENDOR_ID, 1, &rom->vendor); 75 76 if (status != EFI_SUCCESS) { 77 efi_printk("Failed to read rom->vendor\n"); 78 goto free_struct; 79 } 80 81 status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16, 82 PCI_DEVICE_ID, 1, &rom->devid); 83 84 if (status != EFI_SUCCESS) { 85 efi_printk("Failed to read rom->devid\n"); 86 goto free_struct; 87 } 88 89 status = efi_call_proto(pci, get_location, &rom->segment, &rom->bus, 90 &rom->device, &rom->function); 91 92 if (status != EFI_SUCCESS) 93 goto free_struct; 94 95 memcpy(rom->romdata, romimage, romsize); 96 return status; 97 98 free_struct: 99 efi_bs_call(free_pool, rom); 100 return status; 101 } 102 103 /* 104 * There's no way to return an informative status from this function, 105 * because any analysis (and printing of error messages) needs to be 106 * done directly at the EFI function call-site. 107 * 108 * For example, EFI_INVALID_PARAMETER could indicate a bug or maybe we 109 * just didn't find any PCI devices, but there's no way to tell outside 110 * the context of the call. 111 */ 112 static void setup_efi_pci(struct boot_params *params) 113 { 114 efi_status_t status; 115 void **pci_handle = NULL; 116 efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID; 117 unsigned long size = 0; 118 struct setup_data *data; 119 efi_handle_t h; 120 int i; 121 122 status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 123 &pci_proto, NULL, &size, pci_handle); 124 125 if (status == EFI_BUFFER_TOO_SMALL) { 126 status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 127 (void **)&pci_handle); 128 129 if (status != EFI_SUCCESS) { 130 efi_printk("Failed to allocate memory for 'pci_handle'\n"); 131 return; 132 } 133 134 status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 135 &pci_proto, NULL, &size, pci_handle); 136 } 137 138 if (status != EFI_SUCCESS) 139 goto free_handle; 140 141 data = (struct setup_data *)(unsigned long)params->hdr.setup_data; 142 143 while (data && data->next) 144 data = (struct setup_data *)(unsigned long)data->next; 145 146 for_each_efi_handle(h, pci_handle, size, i) { 147 efi_pci_io_protocol_t *pci = NULL; 148 struct pci_setup_rom *rom; 149 150 status = efi_bs_call(handle_protocol, h, &pci_proto, 151 (void **)&pci); 152 if (status != EFI_SUCCESS || !pci) 153 continue; 154 155 status = preserve_pci_rom_image(pci, &rom); 156 if (status != EFI_SUCCESS) 157 continue; 158 159 if (data) 160 data->next = (unsigned long)rom; 161 else 162 params->hdr.setup_data = (unsigned long)rom; 163 164 data = (struct setup_data *)rom; 165 } 166 167 free_handle: 168 efi_bs_call(free_pool, pci_handle); 169 } 170 171 static void retrieve_apple_device_properties(struct boot_params *boot_params) 172 { 173 efi_guid_t guid = APPLE_PROPERTIES_PROTOCOL_GUID; 174 struct setup_data *data, *new; 175 efi_status_t status; 176 u32 size = 0; 177 apple_properties_protocol_t *p; 178 179 status = efi_bs_call(locate_protocol, &guid, NULL, (void **)&p); 180 if (status != EFI_SUCCESS) 181 return; 182 183 if (efi_table_attr(p, version) != 0x10000) { 184 efi_printk("Unsupported properties proto version\n"); 185 return; 186 } 187 188 efi_call_proto(p, get_all, NULL, &size); 189 if (!size) 190 return; 191 192 do { 193 status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, 194 size + sizeof(struct setup_data), 195 (void **)&new); 196 if (status != EFI_SUCCESS) { 197 efi_printk("Failed to allocate memory for 'properties'\n"); 198 return; 199 } 200 201 status = efi_call_proto(p, get_all, new->data, &size); 202 203 if (status == EFI_BUFFER_TOO_SMALL) 204 efi_bs_call(free_pool, new); 205 } while (status == EFI_BUFFER_TOO_SMALL); 206 207 new->type = SETUP_APPLE_PROPERTIES; 208 new->len = size; 209 new->next = 0; 210 211 data = (struct setup_data *)(unsigned long)boot_params->hdr.setup_data; 212 if (!data) { 213 boot_params->hdr.setup_data = (unsigned long)new; 214 } else { 215 while (data->next) 216 data = (struct setup_data *)(unsigned long)data->next; 217 data->next = (unsigned long)new; 218 } 219 } 220 221 static const efi_char16_t apple[] = L"Apple"; 222 223 static void setup_quirks(struct boot_params *boot_params) 224 { 225 efi_char16_t *fw_vendor = (efi_char16_t *)(unsigned long) 226 efi_table_attr(efi_system_table(), fw_vendor); 227 228 if (!memcmp(fw_vendor, apple, sizeof(apple))) { 229 if (IS_ENABLED(CONFIG_APPLE_PROPERTIES)) 230 retrieve_apple_device_properties(boot_params); 231 } 232 } 233 234 /* 235 * See if we have Universal Graphics Adapter (UGA) protocol 236 */ 237 static efi_status_t 238 setup_uga(struct screen_info *si, efi_guid_t *uga_proto, unsigned long size) 239 { 240 efi_status_t status; 241 u32 width, height; 242 void **uga_handle = NULL; 243 efi_uga_draw_protocol_t *uga = NULL, *first_uga; 244 efi_handle_t handle; 245 int i; 246 247 status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 248 (void **)&uga_handle); 249 if (status != EFI_SUCCESS) 250 return status; 251 252 status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 253 uga_proto, NULL, &size, uga_handle); 254 if (status != EFI_SUCCESS) 255 goto free_handle; 256 257 height = 0; 258 width = 0; 259 260 first_uga = NULL; 261 for_each_efi_handle(handle, uga_handle, size, i) { 262 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID; 263 u32 w, h, depth, refresh; 264 void *pciio; 265 266 status = efi_bs_call(handle_protocol, handle, uga_proto, 267 (void **)&uga); 268 if (status != EFI_SUCCESS) 269 continue; 270 271 pciio = NULL; 272 efi_bs_call(handle_protocol, handle, &pciio_proto, &pciio); 273 274 status = efi_call_proto(uga, get_mode, &w, &h, &depth, &refresh); 275 if (status == EFI_SUCCESS && (!first_uga || pciio)) { 276 width = w; 277 height = h; 278 279 /* 280 * Once we've found a UGA supporting PCIIO, 281 * don't bother looking any further. 282 */ 283 if (pciio) 284 break; 285 286 first_uga = uga; 287 } 288 } 289 290 if (!width && !height) 291 goto free_handle; 292 293 /* EFI framebuffer */ 294 si->orig_video_isVGA = VIDEO_TYPE_EFI; 295 296 si->lfb_depth = 32; 297 si->lfb_width = width; 298 si->lfb_height = height; 299 300 si->red_size = 8; 301 si->red_pos = 16; 302 si->green_size = 8; 303 si->green_pos = 8; 304 si->blue_size = 8; 305 si->blue_pos = 0; 306 si->rsvd_size = 8; 307 si->rsvd_pos = 24; 308 309 free_handle: 310 efi_bs_call(free_pool, uga_handle); 311 312 return status; 313 } 314 315 static void setup_graphics(struct boot_params *boot_params) 316 { 317 efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID; 318 struct screen_info *si; 319 efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID; 320 efi_status_t status; 321 unsigned long size; 322 void **gop_handle = NULL; 323 void **uga_handle = NULL; 324 325 si = &boot_params->screen_info; 326 memset(si, 0, sizeof(*si)); 327 328 size = 0; 329 status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 330 &graphics_proto, NULL, &size, gop_handle); 331 if (status == EFI_BUFFER_TOO_SMALL) 332 status = efi_setup_gop(si, &graphics_proto, size); 333 334 if (status != EFI_SUCCESS) { 335 size = 0; 336 status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 337 &uga_proto, NULL, &size, uga_handle); 338 if (status == EFI_BUFFER_TOO_SMALL) 339 setup_uga(si, &uga_proto, size); 340 } 341 } 342 343 void startup_32(struct boot_params *boot_params); 344 345 void __noreturn efi_stub_entry(efi_handle_t handle, 346 efi_system_table_t *sys_table_arg, 347 struct boot_params *boot_params); 348 349 /* 350 * Because the x86 boot code expects to be passed a boot_params we 351 * need to create one ourselves (usually the bootloader would create 352 * one for us). 353 */ 354 efi_status_t __efiapi efi_pe_entry(efi_handle_t handle, 355 efi_system_table_t *sys_table_arg) 356 { 357 struct boot_params *boot_params; 358 struct setup_header *hdr; 359 efi_loaded_image_t *image; 360 efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID; 361 int options_size = 0; 362 efi_status_t status; 363 char *cmdline_ptr; 364 unsigned long ramdisk_addr; 365 unsigned long ramdisk_size; 366 bool above4g; 367 368 sys_table = sys_table_arg; 369 370 /* Check if we were booted by the EFI firmware */ 371 if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) 372 return EFI_INVALID_PARAMETER; 373 374 status = efi_bs_call(handle_protocol, handle, &proto, (void *)&image); 375 if (status != EFI_SUCCESS) { 376 efi_printk("Failed to get handle for LOADED_IMAGE_PROTOCOL\n"); 377 return status; 378 } 379 380 hdr = &((struct boot_params *)image->image_base)->hdr; 381 above4g = hdr->xloadflags & XLF_CAN_BE_LOADED_ABOVE_4G; 382 383 status = efi_allocate_pages(0x4000, (unsigned long *)&boot_params, 384 above4g ? ULONG_MAX : UINT_MAX); 385 if (status != EFI_SUCCESS) { 386 efi_printk("Failed to allocate lowmem for boot params\n"); 387 return status; 388 } 389 390 memset(boot_params, 0x0, 0x4000); 391 392 hdr = &boot_params->hdr; 393 394 /* Copy the second sector to boot_params */ 395 memcpy(&hdr->jump, image->image_base + 512, 512); 396 397 /* 398 * Fill out some of the header fields ourselves because the 399 * EFI firmware loader doesn't load the first sector. 400 */ 401 hdr->root_flags = 1; 402 hdr->vid_mode = 0xffff; 403 hdr->boot_flag = 0xAA55; 404 405 hdr->type_of_loader = 0x21; 406 407 /* Convert unicode cmdline to ascii */ 408 cmdline_ptr = efi_convert_cmdline(image, &options_size, 409 above4g ? ULONG_MAX : UINT_MAX); 410 if (!cmdline_ptr) 411 goto fail; 412 413 hdr->cmd_line_ptr = (unsigned long)cmdline_ptr; 414 /* Fill in upper bits of command line address, NOP on 32 bit */ 415 boot_params->ext_cmd_line_ptr = (u64)(unsigned long)cmdline_ptr >> 32; 416 417 hdr->ramdisk_image = 0; 418 hdr->ramdisk_size = 0; 419 420 status = efi_parse_options(cmdline_ptr); 421 if (status != EFI_SUCCESS) 422 goto fail2; 423 424 status = efi_load_initrd(image, &ramdisk_addr, &ramdisk_size, 425 hdr->initrd_addr_max, 426 above4g ? ULONG_MAX : hdr->initrd_addr_max); 427 if (status != EFI_SUCCESS) 428 goto fail2; 429 hdr->ramdisk_image = ramdisk_addr & 0xffffffff; 430 hdr->ramdisk_size = ramdisk_size & 0xffffffff; 431 boot_params->ext_ramdisk_image = (u64)ramdisk_addr >> 32; 432 boot_params->ext_ramdisk_size = (u64)ramdisk_size >> 32; 433 434 efi_stub_entry(handle, sys_table, boot_params); 435 /* not reached */ 436 437 fail2: 438 efi_free(options_size, (unsigned long)cmdline_ptr); 439 fail: 440 efi_free(0x4000, (unsigned long)boot_params); 441 442 return status; 443 } 444 445 static void add_e820ext(struct boot_params *params, 446 struct setup_data *e820ext, u32 nr_entries) 447 { 448 struct setup_data *data; 449 450 e820ext->type = SETUP_E820_EXT; 451 e820ext->len = nr_entries * sizeof(struct boot_e820_entry); 452 e820ext->next = 0; 453 454 data = (struct setup_data *)(unsigned long)params->hdr.setup_data; 455 456 while (data && data->next) 457 data = (struct setup_data *)(unsigned long)data->next; 458 459 if (data) 460 data->next = (unsigned long)e820ext; 461 else 462 params->hdr.setup_data = (unsigned long)e820ext; 463 } 464 465 static efi_status_t 466 setup_e820(struct boot_params *params, struct setup_data *e820ext, u32 e820ext_size) 467 { 468 struct boot_e820_entry *entry = params->e820_table; 469 struct efi_info *efi = ¶ms->efi_info; 470 struct boot_e820_entry *prev = NULL; 471 u32 nr_entries; 472 u32 nr_desc; 473 int i; 474 475 nr_entries = 0; 476 nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size; 477 478 for (i = 0; i < nr_desc; i++) { 479 efi_memory_desc_t *d; 480 unsigned int e820_type = 0; 481 unsigned long m = efi->efi_memmap; 482 483 #ifdef CONFIG_X86_64 484 m |= (u64)efi->efi_memmap_hi << 32; 485 #endif 486 487 d = efi_early_memdesc_ptr(m, efi->efi_memdesc_size, i); 488 switch (d->type) { 489 case EFI_RESERVED_TYPE: 490 case EFI_RUNTIME_SERVICES_CODE: 491 case EFI_RUNTIME_SERVICES_DATA: 492 case EFI_MEMORY_MAPPED_IO: 493 case EFI_MEMORY_MAPPED_IO_PORT_SPACE: 494 case EFI_PAL_CODE: 495 e820_type = E820_TYPE_RESERVED; 496 break; 497 498 case EFI_UNUSABLE_MEMORY: 499 e820_type = E820_TYPE_UNUSABLE; 500 break; 501 502 case EFI_ACPI_RECLAIM_MEMORY: 503 e820_type = E820_TYPE_ACPI; 504 break; 505 506 case EFI_LOADER_CODE: 507 case EFI_LOADER_DATA: 508 case EFI_BOOT_SERVICES_CODE: 509 case EFI_BOOT_SERVICES_DATA: 510 case EFI_CONVENTIONAL_MEMORY: 511 if (efi_soft_reserve_enabled() && 512 (d->attribute & EFI_MEMORY_SP)) 513 e820_type = E820_TYPE_SOFT_RESERVED; 514 else 515 e820_type = E820_TYPE_RAM; 516 break; 517 518 case EFI_ACPI_MEMORY_NVS: 519 e820_type = E820_TYPE_NVS; 520 break; 521 522 case EFI_PERSISTENT_MEMORY: 523 e820_type = E820_TYPE_PMEM; 524 break; 525 526 default: 527 continue; 528 } 529 530 /* Merge adjacent mappings */ 531 if (prev && prev->type == e820_type && 532 (prev->addr + prev->size) == d->phys_addr) { 533 prev->size += d->num_pages << 12; 534 continue; 535 } 536 537 if (nr_entries == ARRAY_SIZE(params->e820_table)) { 538 u32 need = (nr_desc - i) * sizeof(struct e820_entry) + 539 sizeof(struct setup_data); 540 541 if (!e820ext || e820ext_size < need) 542 return EFI_BUFFER_TOO_SMALL; 543 544 /* boot_params map full, switch to e820 extended */ 545 entry = (struct boot_e820_entry *)e820ext->data; 546 } 547 548 entry->addr = d->phys_addr; 549 entry->size = d->num_pages << PAGE_SHIFT; 550 entry->type = e820_type; 551 prev = entry++; 552 nr_entries++; 553 } 554 555 if (nr_entries > ARRAY_SIZE(params->e820_table)) { 556 u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_table); 557 558 add_e820ext(params, e820ext, nr_e820ext); 559 nr_entries -= nr_e820ext; 560 } 561 562 params->e820_entries = (u8)nr_entries; 563 564 return EFI_SUCCESS; 565 } 566 567 static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext, 568 u32 *e820ext_size) 569 { 570 efi_status_t status; 571 unsigned long size; 572 573 size = sizeof(struct setup_data) + 574 sizeof(struct e820_entry) * nr_desc; 575 576 if (*e820ext) { 577 efi_bs_call(free_pool, *e820ext); 578 *e820ext = NULL; 579 *e820ext_size = 0; 580 } 581 582 status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 583 (void **)e820ext); 584 if (status == EFI_SUCCESS) 585 *e820ext_size = size; 586 587 return status; 588 } 589 590 static efi_status_t allocate_e820(struct boot_params *params, 591 struct setup_data **e820ext, 592 u32 *e820ext_size) 593 { 594 unsigned long map_size, desc_size, buff_size; 595 struct efi_boot_memmap boot_map; 596 efi_memory_desc_t *map; 597 efi_status_t status; 598 __u32 nr_desc; 599 600 boot_map.map = ↦ 601 boot_map.map_size = &map_size; 602 boot_map.desc_size = &desc_size; 603 boot_map.desc_ver = NULL; 604 boot_map.key_ptr = NULL; 605 boot_map.buff_size = &buff_size; 606 607 status = efi_get_memory_map(&boot_map); 608 if (status != EFI_SUCCESS) 609 return status; 610 611 nr_desc = buff_size / desc_size; 612 613 if (nr_desc > ARRAY_SIZE(params->e820_table)) { 614 u32 nr_e820ext = nr_desc - ARRAY_SIZE(params->e820_table); 615 616 status = alloc_e820ext(nr_e820ext, e820ext, e820ext_size); 617 if (status != EFI_SUCCESS) 618 return status; 619 } 620 621 return EFI_SUCCESS; 622 } 623 624 struct exit_boot_struct { 625 struct boot_params *boot_params; 626 struct efi_info *efi; 627 }; 628 629 static efi_status_t exit_boot_func(struct efi_boot_memmap *map, 630 void *priv) 631 { 632 const char *signature; 633 struct exit_boot_struct *p = priv; 634 635 signature = efi_is_64bit() ? EFI64_LOADER_SIGNATURE 636 : EFI32_LOADER_SIGNATURE; 637 memcpy(&p->efi->efi_loader_signature, signature, sizeof(__u32)); 638 639 p->efi->efi_systab = (unsigned long)efi_system_table(); 640 p->efi->efi_memdesc_size = *map->desc_size; 641 p->efi->efi_memdesc_version = *map->desc_ver; 642 p->efi->efi_memmap = (unsigned long)*map->map; 643 p->efi->efi_memmap_size = *map->map_size; 644 645 #ifdef CONFIG_X86_64 646 p->efi->efi_systab_hi = (unsigned long)efi_system_table() >> 32; 647 p->efi->efi_memmap_hi = (unsigned long)*map->map >> 32; 648 #endif 649 650 return EFI_SUCCESS; 651 } 652 653 static efi_status_t exit_boot(struct boot_params *boot_params, void *handle) 654 { 655 unsigned long map_sz, key, desc_size, buff_size; 656 efi_memory_desc_t *mem_map; 657 struct setup_data *e820ext = NULL; 658 __u32 e820ext_size = 0; 659 efi_status_t status; 660 __u32 desc_version; 661 struct efi_boot_memmap map; 662 struct exit_boot_struct priv; 663 664 map.map = &mem_map; 665 map.map_size = &map_sz; 666 map.desc_size = &desc_size; 667 map.desc_ver = &desc_version; 668 map.key_ptr = &key; 669 map.buff_size = &buff_size; 670 priv.boot_params = boot_params; 671 priv.efi = &boot_params->efi_info; 672 673 status = allocate_e820(boot_params, &e820ext, &e820ext_size); 674 if (status != EFI_SUCCESS) 675 return status; 676 677 /* Might as well exit boot services now */ 678 status = efi_exit_boot_services(handle, &map, &priv, exit_boot_func); 679 if (status != EFI_SUCCESS) 680 return status; 681 682 /* Historic? */ 683 boot_params->alt_mem_k = 32 * 1024; 684 685 status = setup_e820(boot_params, e820ext, e820ext_size); 686 if (status != EFI_SUCCESS) 687 return status; 688 689 return EFI_SUCCESS; 690 } 691 692 /* 693 * On success we return a pointer to a boot_params structure, and NULL 694 * on failure. 695 */ 696 struct boot_params *efi_main(efi_handle_t handle, 697 efi_system_table_t *sys_table_arg, 698 struct boot_params *boot_params) 699 { 700 unsigned long bzimage_addr = (unsigned long)startup_32; 701 struct setup_header *hdr = &boot_params->hdr; 702 efi_status_t status; 703 unsigned long cmdline_paddr; 704 705 sys_table = sys_table_arg; 706 707 /* Check if we were booted by the EFI firmware */ 708 if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) 709 goto fail; 710 711 /* 712 * If the kernel isn't already loaded at the preferred load 713 * address, relocate it. 714 */ 715 if (bzimage_addr != hdr->pref_address) { 716 status = efi_relocate_kernel(&bzimage_addr, 717 hdr->init_size, hdr->init_size, 718 hdr->pref_address, 719 hdr->kernel_alignment, 720 LOAD_PHYSICAL_ADDR); 721 if (status != EFI_SUCCESS) { 722 efi_printk("efi_relocate_kernel() failed!\n"); 723 goto fail; 724 } 725 } 726 hdr->code32_start = (u32)bzimage_addr; 727 728 /* 729 * efi_pe_entry() may have been called before efi_main(), in which 730 * case this is the second time we parse the cmdline. This is ok, 731 * parsing the cmdline multiple times does not have side-effects. 732 */ 733 cmdline_paddr = ((u64)hdr->cmd_line_ptr | 734 ((u64)boot_params->ext_cmd_line_ptr << 32)); 735 efi_parse_options((char *)cmdline_paddr); 736 737 /* 738 * If the boot loader gave us a value for secure_boot then we use that, 739 * otherwise we ask the BIOS. 740 */ 741 if (boot_params->secure_boot == efi_secureboot_mode_unset) 742 boot_params->secure_boot = efi_get_secureboot(); 743 744 /* Ask the firmware to clear memory on unclean shutdown */ 745 efi_enable_reset_attack_mitigation(); 746 747 efi_random_get_seed(); 748 749 efi_retrieve_tpm2_eventlog(); 750 751 setup_graphics(boot_params); 752 753 setup_efi_pci(boot_params); 754 755 setup_quirks(boot_params); 756 757 status = exit_boot(boot_params, handle); 758 if (status != EFI_SUCCESS) { 759 efi_printk("exit_boot() failed!\n"); 760 goto fail; 761 } 762 763 return boot_params; 764 fail: 765 efi_printk("efi_main() failed!\n"); 766 767 for (;;) 768 asm("hlt"); 769 } 770