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 /* Maximum physical address for 64-bit kernel with 4-level paging */ 21 #define MAXMEM_X86_64_4LEVEL (1ull << 46) 22 23 const efi_system_table_t *efi_system_table; 24 extern u32 image_offset; 25 static efi_loaded_image_t *image = NULL; 26 27 static efi_status_t 28 preserve_pci_rom_image(efi_pci_io_protocol_t *pci, struct pci_setup_rom **__rom) 29 { 30 struct pci_setup_rom *rom = NULL; 31 efi_status_t status; 32 unsigned long size; 33 uint64_t romsize; 34 void *romimage; 35 36 /* 37 * Some firmware images contain EFI function pointers at the place where 38 * the romimage and romsize fields are supposed to be. Typically the EFI 39 * code is mapped at high addresses, translating to an unrealistically 40 * large romsize. The UEFI spec limits the size of option ROMs to 16 41 * MiB so we reject any ROMs over 16 MiB in size to catch this. 42 */ 43 romimage = efi_table_attr(pci, romimage); 44 romsize = efi_table_attr(pci, romsize); 45 if (!romimage || !romsize || romsize > SZ_16M) 46 return EFI_INVALID_PARAMETER; 47 48 size = romsize + sizeof(*rom); 49 50 status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 51 (void **)&rom); 52 if (status != EFI_SUCCESS) { 53 efi_err("Failed to allocate memory for 'rom'\n"); 54 return status; 55 } 56 57 memset(rom, 0, sizeof(*rom)); 58 59 rom->data.type = SETUP_PCI; 60 rom->data.len = size - sizeof(struct setup_data); 61 rom->data.next = 0; 62 rom->pcilen = pci->romsize; 63 *__rom = rom; 64 65 status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16, 66 PCI_VENDOR_ID, 1, &rom->vendor); 67 68 if (status != EFI_SUCCESS) { 69 efi_err("Failed to read rom->vendor\n"); 70 goto free_struct; 71 } 72 73 status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16, 74 PCI_DEVICE_ID, 1, &rom->devid); 75 76 if (status != EFI_SUCCESS) { 77 efi_err("Failed to read rom->devid\n"); 78 goto free_struct; 79 } 80 81 status = efi_call_proto(pci, get_location, &rom->segment, &rom->bus, 82 &rom->device, &rom->function); 83 84 if (status != EFI_SUCCESS) 85 goto free_struct; 86 87 memcpy(rom->romdata, romimage, romsize); 88 return status; 89 90 free_struct: 91 efi_bs_call(free_pool, rom); 92 return status; 93 } 94 95 /* 96 * There's no way to return an informative status from this function, 97 * because any analysis (and printing of error messages) needs to be 98 * done directly at the EFI function call-site. 99 * 100 * For example, EFI_INVALID_PARAMETER could indicate a bug or maybe we 101 * just didn't find any PCI devices, but there's no way to tell outside 102 * the context of the call. 103 */ 104 static void setup_efi_pci(struct boot_params *params) 105 { 106 efi_status_t status; 107 void **pci_handle = NULL; 108 efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID; 109 unsigned long size = 0; 110 struct setup_data *data; 111 efi_handle_t h; 112 int i; 113 114 status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 115 &pci_proto, NULL, &size, pci_handle); 116 117 if (status == EFI_BUFFER_TOO_SMALL) { 118 status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 119 (void **)&pci_handle); 120 121 if (status != EFI_SUCCESS) { 122 efi_err("Failed to allocate memory for 'pci_handle'\n"); 123 return; 124 } 125 126 status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 127 &pci_proto, NULL, &size, pci_handle); 128 } 129 130 if (status != EFI_SUCCESS) 131 goto free_handle; 132 133 data = (struct setup_data *)(unsigned long)params->hdr.setup_data; 134 135 while (data && data->next) 136 data = (struct setup_data *)(unsigned long)data->next; 137 138 for_each_efi_handle(h, pci_handle, size, i) { 139 efi_pci_io_protocol_t *pci = NULL; 140 struct pci_setup_rom *rom; 141 142 status = efi_bs_call(handle_protocol, h, &pci_proto, 143 (void **)&pci); 144 if (status != EFI_SUCCESS || !pci) 145 continue; 146 147 status = preserve_pci_rom_image(pci, &rom); 148 if (status != EFI_SUCCESS) 149 continue; 150 151 if (data) 152 data->next = (unsigned long)rom; 153 else 154 params->hdr.setup_data = (unsigned long)rom; 155 156 data = (struct setup_data *)rom; 157 } 158 159 free_handle: 160 efi_bs_call(free_pool, pci_handle); 161 } 162 163 static void retrieve_apple_device_properties(struct boot_params *boot_params) 164 { 165 efi_guid_t guid = APPLE_PROPERTIES_PROTOCOL_GUID; 166 struct setup_data *data, *new; 167 efi_status_t status; 168 u32 size = 0; 169 apple_properties_protocol_t *p; 170 171 status = efi_bs_call(locate_protocol, &guid, NULL, (void **)&p); 172 if (status != EFI_SUCCESS) 173 return; 174 175 if (efi_table_attr(p, version) != 0x10000) { 176 efi_err("Unsupported properties proto version\n"); 177 return; 178 } 179 180 efi_call_proto(p, get_all, NULL, &size); 181 if (!size) 182 return; 183 184 do { 185 status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, 186 size + sizeof(struct setup_data), 187 (void **)&new); 188 if (status != EFI_SUCCESS) { 189 efi_err("Failed to allocate memory for 'properties'\n"); 190 return; 191 } 192 193 status = efi_call_proto(p, get_all, new->data, &size); 194 195 if (status == EFI_BUFFER_TOO_SMALL) 196 efi_bs_call(free_pool, new); 197 } while (status == EFI_BUFFER_TOO_SMALL); 198 199 new->type = SETUP_APPLE_PROPERTIES; 200 new->len = size; 201 new->next = 0; 202 203 data = (struct setup_data *)(unsigned long)boot_params->hdr.setup_data; 204 if (!data) { 205 boot_params->hdr.setup_data = (unsigned long)new; 206 } else { 207 while (data->next) 208 data = (struct setup_data *)(unsigned long)data->next; 209 data->next = (unsigned long)new; 210 } 211 } 212 213 static const efi_char16_t apple[] = L"Apple"; 214 215 static void setup_quirks(struct boot_params *boot_params) 216 { 217 efi_char16_t *fw_vendor = (efi_char16_t *)(unsigned long) 218 efi_table_attr(efi_system_table, fw_vendor); 219 220 if (!memcmp(fw_vendor, apple, sizeof(apple))) { 221 if (IS_ENABLED(CONFIG_APPLE_PROPERTIES)) 222 retrieve_apple_device_properties(boot_params); 223 } 224 } 225 226 /* 227 * See if we have Universal Graphics Adapter (UGA) protocol 228 */ 229 static efi_status_t 230 setup_uga(struct screen_info *si, efi_guid_t *uga_proto, unsigned long size) 231 { 232 efi_status_t status; 233 u32 width, height; 234 void **uga_handle = NULL; 235 efi_uga_draw_protocol_t *uga = NULL, *first_uga; 236 efi_handle_t handle; 237 int i; 238 239 status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 240 (void **)&uga_handle); 241 if (status != EFI_SUCCESS) 242 return status; 243 244 status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 245 uga_proto, NULL, &size, uga_handle); 246 if (status != EFI_SUCCESS) 247 goto free_handle; 248 249 height = 0; 250 width = 0; 251 252 first_uga = NULL; 253 for_each_efi_handle(handle, uga_handle, size, i) { 254 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID; 255 u32 w, h, depth, refresh; 256 void *pciio; 257 258 status = efi_bs_call(handle_protocol, handle, uga_proto, 259 (void **)&uga); 260 if (status != EFI_SUCCESS) 261 continue; 262 263 pciio = NULL; 264 efi_bs_call(handle_protocol, handle, &pciio_proto, &pciio); 265 266 status = efi_call_proto(uga, get_mode, &w, &h, &depth, &refresh); 267 if (status == EFI_SUCCESS && (!first_uga || pciio)) { 268 width = w; 269 height = h; 270 271 /* 272 * Once we've found a UGA supporting PCIIO, 273 * don't bother looking any further. 274 */ 275 if (pciio) 276 break; 277 278 first_uga = uga; 279 } 280 } 281 282 if (!width && !height) 283 goto free_handle; 284 285 /* EFI framebuffer */ 286 si->orig_video_isVGA = VIDEO_TYPE_EFI; 287 288 si->lfb_depth = 32; 289 si->lfb_width = width; 290 si->lfb_height = height; 291 292 si->red_size = 8; 293 si->red_pos = 16; 294 si->green_size = 8; 295 si->green_pos = 8; 296 si->blue_size = 8; 297 si->blue_pos = 0; 298 si->rsvd_size = 8; 299 si->rsvd_pos = 24; 300 301 free_handle: 302 efi_bs_call(free_pool, uga_handle); 303 304 return status; 305 } 306 307 static void setup_graphics(struct boot_params *boot_params) 308 { 309 efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID; 310 struct screen_info *si; 311 efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID; 312 efi_status_t status; 313 unsigned long size; 314 void **gop_handle = NULL; 315 void **uga_handle = NULL; 316 317 si = &boot_params->screen_info; 318 memset(si, 0, sizeof(*si)); 319 320 size = 0; 321 status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 322 &graphics_proto, NULL, &size, gop_handle); 323 if (status == EFI_BUFFER_TOO_SMALL) 324 status = efi_setup_gop(si, &graphics_proto, size); 325 326 if (status != EFI_SUCCESS) { 327 size = 0; 328 status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 329 &uga_proto, NULL, &size, uga_handle); 330 if (status == EFI_BUFFER_TOO_SMALL) 331 setup_uga(si, &uga_proto, size); 332 } 333 } 334 335 336 static void __noreturn efi_exit(efi_handle_t handle, efi_status_t status) 337 { 338 efi_bs_call(exit, handle, status, 0, NULL); 339 for(;;) 340 asm("hlt"); 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 void *image_base; 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; 366 367 efi_system_table = sys_table_arg; 368 369 /* Check if we were booted by the EFI firmware */ 370 if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) 371 efi_exit(handle, EFI_INVALID_PARAMETER); 372 373 status = efi_bs_call(handle_protocol, handle, &proto, (void **)&image); 374 if (status != EFI_SUCCESS) { 375 efi_err("Failed to get handle for LOADED_IMAGE_PROTOCOL\n"); 376 efi_exit(handle, status); 377 } 378 379 image_base = efi_table_attr(image, image_base); 380 image_offset = (void *)startup_32 - image_base; 381 382 status = efi_allocate_pages(sizeof(struct boot_params), 383 (unsigned long *)&boot_params, ULONG_MAX); 384 if (status != EFI_SUCCESS) { 385 efi_err("Failed to allocate lowmem for boot params\n"); 386 efi_exit(handle, status); 387 } 388 389 memset(boot_params, 0x0, sizeof(struct boot_params)); 390 391 hdr = &boot_params->hdr; 392 393 /* Copy the second sector to boot_params */ 394 memcpy(&hdr->jump, image_base + 512, 512); 395 396 /* 397 * Fill out some of the header fields ourselves because the 398 * EFI firmware loader doesn't load the first sector. 399 */ 400 hdr->root_flags = 1; 401 hdr->vid_mode = 0xffff; 402 hdr->boot_flag = 0xAA55; 403 404 hdr->type_of_loader = 0x21; 405 406 /* Convert unicode cmdline to ascii */ 407 cmdline_ptr = efi_convert_cmdline(image, &options_size); 408 if (!cmdline_ptr) 409 goto fail; 410 411 efi_set_u64_split((unsigned long)cmdline_ptr, 412 &hdr->cmd_line_ptr, &boot_params->ext_cmd_line_ptr); 413 414 hdr->ramdisk_image = 0; 415 hdr->ramdisk_size = 0; 416 417 efi_stub_entry(handle, sys_table_arg, boot_params); 418 /* not reached */ 419 420 fail: 421 efi_free(sizeof(struct boot_params), (unsigned long)boot_params); 422 423 efi_exit(handle, status); 424 } 425 426 static void add_e820ext(struct boot_params *params, 427 struct setup_data *e820ext, u32 nr_entries) 428 { 429 struct setup_data *data; 430 431 e820ext->type = SETUP_E820_EXT; 432 e820ext->len = nr_entries * sizeof(struct boot_e820_entry); 433 e820ext->next = 0; 434 435 data = (struct setup_data *)(unsigned long)params->hdr.setup_data; 436 437 while (data && data->next) 438 data = (struct setup_data *)(unsigned long)data->next; 439 440 if (data) 441 data->next = (unsigned long)e820ext; 442 else 443 params->hdr.setup_data = (unsigned long)e820ext; 444 } 445 446 static efi_status_t 447 setup_e820(struct boot_params *params, struct setup_data *e820ext, u32 e820ext_size) 448 { 449 struct boot_e820_entry *entry = params->e820_table; 450 struct efi_info *efi = ¶ms->efi_info; 451 struct boot_e820_entry *prev = NULL; 452 u32 nr_entries; 453 u32 nr_desc; 454 int i; 455 456 nr_entries = 0; 457 nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size; 458 459 for (i = 0; i < nr_desc; i++) { 460 efi_memory_desc_t *d; 461 unsigned int e820_type = 0; 462 unsigned long m = efi->efi_memmap; 463 464 #ifdef CONFIG_X86_64 465 m |= (u64)efi->efi_memmap_hi << 32; 466 #endif 467 468 d = efi_early_memdesc_ptr(m, efi->efi_memdesc_size, i); 469 switch (d->type) { 470 case EFI_RESERVED_TYPE: 471 case EFI_RUNTIME_SERVICES_CODE: 472 case EFI_RUNTIME_SERVICES_DATA: 473 case EFI_MEMORY_MAPPED_IO: 474 case EFI_MEMORY_MAPPED_IO_PORT_SPACE: 475 case EFI_PAL_CODE: 476 e820_type = E820_TYPE_RESERVED; 477 break; 478 479 case EFI_UNUSABLE_MEMORY: 480 e820_type = E820_TYPE_UNUSABLE; 481 break; 482 483 case EFI_ACPI_RECLAIM_MEMORY: 484 e820_type = E820_TYPE_ACPI; 485 break; 486 487 case EFI_LOADER_CODE: 488 case EFI_LOADER_DATA: 489 case EFI_BOOT_SERVICES_CODE: 490 case EFI_BOOT_SERVICES_DATA: 491 case EFI_CONVENTIONAL_MEMORY: 492 if (efi_soft_reserve_enabled() && 493 (d->attribute & EFI_MEMORY_SP)) 494 e820_type = E820_TYPE_SOFT_RESERVED; 495 else 496 e820_type = E820_TYPE_RAM; 497 break; 498 499 case EFI_ACPI_MEMORY_NVS: 500 e820_type = E820_TYPE_NVS; 501 break; 502 503 case EFI_PERSISTENT_MEMORY: 504 e820_type = E820_TYPE_PMEM; 505 break; 506 507 default: 508 continue; 509 } 510 511 /* Merge adjacent mappings */ 512 if (prev && prev->type == e820_type && 513 (prev->addr + prev->size) == d->phys_addr) { 514 prev->size += d->num_pages << 12; 515 continue; 516 } 517 518 if (nr_entries == ARRAY_SIZE(params->e820_table)) { 519 u32 need = (nr_desc - i) * sizeof(struct e820_entry) + 520 sizeof(struct setup_data); 521 522 if (!e820ext || e820ext_size < need) 523 return EFI_BUFFER_TOO_SMALL; 524 525 /* boot_params map full, switch to e820 extended */ 526 entry = (struct boot_e820_entry *)e820ext->data; 527 } 528 529 entry->addr = d->phys_addr; 530 entry->size = d->num_pages << PAGE_SHIFT; 531 entry->type = e820_type; 532 prev = entry++; 533 nr_entries++; 534 } 535 536 if (nr_entries > ARRAY_SIZE(params->e820_table)) { 537 u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_table); 538 539 add_e820ext(params, e820ext, nr_e820ext); 540 nr_entries -= nr_e820ext; 541 } 542 543 params->e820_entries = (u8)nr_entries; 544 545 return EFI_SUCCESS; 546 } 547 548 static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext, 549 u32 *e820ext_size) 550 { 551 efi_status_t status; 552 unsigned long size; 553 554 size = sizeof(struct setup_data) + 555 sizeof(struct e820_entry) * nr_desc; 556 557 if (*e820ext) { 558 efi_bs_call(free_pool, *e820ext); 559 *e820ext = NULL; 560 *e820ext_size = 0; 561 } 562 563 status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 564 (void **)e820ext); 565 if (status == EFI_SUCCESS) 566 *e820ext_size = size; 567 568 return status; 569 } 570 571 static efi_status_t allocate_e820(struct boot_params *params, 572 struct setup_data **e820ext, 573 u32 *e820ext_size) 574 { 575 unsigned long map_size, desc_size, map_key; 576 efi_status_t status; 577 __u32 nr_desc, desc_version; 578 579 /* Only need the size of the mem map and size of each mem descriptor */ 580 map_size = 0; 581 status = efi_bs_call(get_memory_map, &map_size, NULL, &map_key, 582 &desc_size, &desc_version); 583 if (status != EFI_BUFFER_TOO_SMALL) 584 return (status != EFI_SUCCESS) ? status : EFI_UNSUPPORTED; 585 586 nr_desc = map_size / desc_size + EFI_MMAP_NR_SLACK_SLOTS; 587 588 if (nr_desc > ARRAY_SIZE(params->e820_table)) { 589 u32 nr_e820ext = nr_desc - ARRAY_SIZE(params->e820_table); 590 591 status = alloc_e820ext(nr_e820ext, e820ext, e820ext_size); 592 if (status != EFI_SUCCESS) 593 return status; 594 } 595 596 return EFI_SUCCESS; 597 } 598 599 struct exit_boot_struct { 600 struct boot_params *boot_params; 601 struct efi_info *efi; 602 }; 603 604 static efi_status_t exit_boot_func(struct efi_boot_memmap *map, 605 void *priv) 606 { 607 const char *signature; 608 struct exit_boot_struct *p = priv; 609 610 signature = efi_is_64bit() ? EFI64_LOADER_SIGNATURE 611 : EFI32_LOADER_SIGNATURE; 612 memcpy(&p->efi->efi_loader_signature, signature, sizeof(__u32)); 613 614 efi_set_u64_split((unsigned long)efi_system_table, 615 &p->efi->efi_systab, &p->efi->efi_systab_hi); 616 p->efi->efi_memdesc_size = *map->desc_size; 617 p->efi->efi_memdesc_version = *map->desc_ver; 618 efi_set_u64_split((unsigned long)*map->map, 619 &p->efi->efi_memmap, &p->efi->efi_memmap_hi); 620 p->efi->efi_memmap_size = *map->map_size; 621 622 return EFI_SUCCESS; 623 } 624 625 static efi_status_t exit_boot(struct boot_params *boot_params, void *handle) 626 { 627 unsigned long map_sz, key, desc_size, buff_size; 628 efi_memory_desc_t *mem_map; 629 struct setup_data *e820ext = NULL; 630 __u32 e820ext_size = 0; 631 efi_status_t status; 632 __u32 desc_version; 633 struct efi_boot_memmap map; 634 struct exit_boot_struct priv; 635 636 map.map = &mem_map; 637 map.map_size = &map_sz; 638 map.desc_size = &desc_size; 639 map.desc_ver = &desc_version; 640 map.key_ptr = &key; 641 map.buff_size = &buff_size; 642 priv.boot_params = boot_params; 643 priv.efi = &boot_params->efi_info; 644 645 status = allocate_e820(boot_params, &e820ext, &e820ext_size); 646 if (status != EFI_SUCCESS) 647 return status; 648 649 /* Might as well exit boot services now */ 650 status = efi_exit_boot_services(handle, &map, &priv, exit_boot_func); 651 if (status != EFI_SUCCESS) 652 return status; 653 654 /* Historic? */ 655 boot_params->alt_mem_k = 32 * 1024; 656 657 status = setup_e820(boot_params, e820ext, e820ext_size); 658 if (status != EFI_SUCCESS) 659 return status; 660 661 return EFI_SUCCESS; 662 } 663 664 /* 665 * On success, we return the address of startup_32, which has potentially been 666 * relocated by efi_relocate_kernel. 667 * On failure, we exit to the firmware via efi_exit instead of returning. 668 */ 669 unsigned long efi_main(efi_handle_t handle, 670 efi_system_table_t *sys_table_arg, 671 struct boot_params *boot_params) 672 { 673 unsigned long bzimage_addr = (unsigned long)startup_32; 674 unsigned long buffer_start, buffer_end; 675 struct setup_header *hdr = &boot_params->hdr; 676 efi_status_t status; 677 678 efi_system_table = sys_table_arg; 679 680 /* Check if we were booted by the EFI firmware */ 681 if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) 682 efi_exit(handle, EFI_INVALID_PARAMETER); 683 684 /* 685 * If the kernel isn't already loaded at a suitable address, 686 * relocate it. 687 * 688 * It must be loaded above LOAD_PHYSICAL_ADDR. 689 * 690 * The maximum address for 64-bit is 1 << 46 for 4-level paging. This 691 * is defined as the macro MAXMEM, but unfortunately that is not a 692 * compile-time constant if 5-level paging is configured, so we instead 693 * define our own macro for use here. 694 * 695 * For 32-bit, the maximum address is complicated to figure out, for 696 * now use KERNEL_IMAGE_SIZE, which will be 512MiB, the same as what 697 * KASLR uses. 698 * 699 * Also relocate it if image_offset is zero, i.e. the kernel wasn't 700 * loaded by LoadImage, but rather by a bootloader that called the 701 * handover entry. The reason we must always relocate in this case is 702 * to handle the case of systemd-boot booting a unified kernel image, 703 * which is a PE executable that contains the bzImage and an initrd as 704 * COFF sections. The initrd section is placed after the bzImage 705 * without ensuring that there are at least init_size bytes available 706 * for the bzImage, and thus the compressed kernel's startup code may 707 * overwrite the initrd unless it is moved out of the way. 708 */ 709 710 buffer_start = ALIGN(bzimage_addr - image_offset, 711 hdr->kernel_alignment); 712 buffer_end = buffer_start + hdr->init_size; 713 714 if ((buffer_start < LOAD_PHYSICAL_ADDR) || 715 (IS_ENABLED(CONFIG_X86_32) && buffer_end > KERNEL_IMAGE_SIZE) || 716 (IS_ENABLED(CONFIG_X86_64) && buffer_end > MAXMEM_X86_64_4LEVEL) || 717 (image_offset == 0)) { 718 status = efi_relocate_kernel(&bzimage_addr, 719 hdr->init_size, hdr->init_size, 720 hdr->pref_address, 721 hdr->kernel_alignment, 722 LOAD_PHYSICAL_ADDR); 723 if (status != EFI_SUCCESS) { 724 efi_err("efi_relocate_kernel() failed!\n"); 725 goto fail; 726 } 727 /* 728 * Now that we've copied the kernel elsewhere, we no longer 729 * have a set up block before startup_32(), so reset image_offset 730 * to zero in case it was set earlier. 731 */ 732 image_offset = 0; 733 } 734 735 #ifdef CONFIG_CMDLINE_BOOL 736 status = efi_parse_options(CONFIG_CMDLINE); 737 if (status != EFI_SUCCESS) { 738 efi_err("Failed to parse options\n"); 739 goto fail; 740 } 741 #endif 742 if (!IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) { 743 unsigned long cmdline_paddr = ((u64)hdr->cmd_line_ptr | 744 ((u64)boot_params->ext_cmd_line_ptr << 32)); 745 status = efi_parse_options((char *)cmdline_paddr); 746 if (status != EFI_SUCCESS) { 747 efi_err("Failed to parse options\n"); 748 goto fail; 749 } 750 } 751 752 /* 753 * At this point, an initrd may already have been loaded by the 754 * bootloader and passed via bootparams. We permit an initrd loaded 755 * from the LINUX_EFI_INITRD_MEDIA_GUID device path to supersede it. 756 * 757 * If the device path is not present, any command-line initrd= 758 * arguments will be processed only if image is not NULL, which will be 759 * the case only if we were loaded via the PE entry point. 760 */ 761 if (!efi_noinitrd) { 762 unsigned long addr, size; 763 764 status = efi_load_initrd(image, &addr, &size, 765 hdr->initrd_addr_max, ULONG_MAX); 766 767 if (status != EFI_SUCCESS) { 768 efi_err("Failed to load initrd!\n"); 769 goto fail; 770 } 771 if (size > 0) { 772 efi_set_u64_split(addr, &hdr->ramdisk_image, 773 &boot_params->ext_ramdisk_image); 774 efi_set_u64_split(size, &hdr->ramdisk_size, 775 &boot_params->ext_ramdisk_size); 776 } 777 } 778 779 /* 780 * If the boot loader gave us a value for secure_boot then we use that, 781 * otherwise we ask the BIOS. 782 */ 783 if (boot_params->secure_boot == efi_secureboot_mode_unset) 784 boot_params->secure_boot = efi_get_secureboot(); 785 786 /* Ask the firmware to clear memory on unclean shutdown */ 787 efi_enable_reset_attack_mitigation(); 788 789 efi_random_get_seed(); 790 791 efi_retrieve_tpm2_eventlog(); 792 793 setup_graphics(boot_params); 794 795 setup_efi_pci(boot_params); 796 797 setup_quirks(boot_params); 798 799 status = exit_boot(boot_params, handle); 800 if (status != EFI_SUCCESS) { 801 efi_err("exit_boot() failed!\n"); 802 goto fail; 803 } 804 805 return bzimage_addr; 806 fail: 807 efi_err("efi_main() failed!\n"); 808 809 efi_exit(handle, status); 810 } 811