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#include <linux/stddef.h> 12 13#include <asm/efi.h> 14#include <asm/e820/types.h> 15#include <asm/setup.h> 16#include <asm/desc.h> 17#include <asm/boot.h> 18 19#include "efistub.h" 20 21/* Maximum physical address for 64-bit kernel with 4-level paging */ 22#define MAXMEM_X86_64_4LEVEL (1ull << 46) 23 24const efi_system_table_t *efi_system_table; 25extern u32 image_offset; 26static efi_loaded_image_t *image = NULL; 27 28static efi_status_t 29preserve_pci_rom_image(efi_pci_io_protocol_t *pci, struct pci_setup_rom **__rom) 30{ 31 struct pci_setup_rom *rom = NULL; 32 efi_status_t status; 33 unsigned long size; 34 uint64_t romsize; 35 void *romimage; 36 37 /* 38 * Some firmware images contain EFI function pointers at the place where 39 * the romimage and romsize fields are supposed to be. Typically the EFI 40 * code is mapped at high addresses, translating to an unrealistically 41 * large romsize. The UEFI spec limits the size of option ROMs to 16 42 * MiB so we reject any ROMs over 16 MiB in size to catch this. 43 */ 44 romimage = efi_table_attr(pci, romimage); 45 romsize = efi_table_attr(pci, romsize); 46 if (!romimage || !romsize || romsize > SZ_16M) 47 return EFI_INVALID_PARAMETER; 48 49 size = romsize + sizeof(*rom); 50 51 status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 52 (void **)&rom); 53 if (status != EFI_SUCCESS) { 54 efi_err("Failed to allocate memory for 'rom'\n"); 55 return status; 56 } 57 58 memset(rom, 0, sizeof(*rom)); 59 60 rom->data.type = SETUP_PCI; 61 rom->data.len = size - sizeof(struct setup_data); 62 rom->data.next = 0; 63 rom->pcilen = romsize; 64 *__rom = rom; 65 66 status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16, 67 PCI_VENDOR_ID, 1, &rom->vendor); 68 69 if (status != EFI_SUCCESS) { 70 efi_err("Failed to read rom->vendor\n"); 71 goto free_struct; 72 } 73 74 status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16, 75 PCI_DEVICE_ID, 1, &rom->devid); 76 77 if (status != EFI_SUCCESS) { 78 efi_err("Failed to read rom->devid\n"); 79 goto free_struct; 80 } 81 82 status = efi_call_proto(pci, get_location, &rom->segment, &rom->bus, 83 &rom->device, &rom->function); 84 85 if (status != EFI_SUCCESS) 86 goto free_struct; 87 88 memcpy(rom->romdata, romimage, romsize); 89 return status; 90 91free_struct: 92 efi_bs_call(free_pool, rom); 93 return status; 94} 95 96/* 97 * There's no way to return an informative status from this function, 98 * because any analysis (and printing of error messages) needs to be 99 * done directly at the EFI function call-site. 100 * 101 * For example, EFI_INVALID_PARAMETER could indicate a bug or maybe we 102 * just didn't find any PCI devices, but there's no way to tell outside 103 * the context of the call. 104 */ 105static void setup_efi_pci(struct boot_params *params) 106{ 107 efi_status_t status; 108 void **pci_handle = NULL; 109 efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID; 110 unsigned long size = 0; 111 struct setup_data *data; 112 efi_handle_t h; 113 int i; 114 115 status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 116 &pci_proto, NULL, &size, pci_handle); 117 118 if (status == EFI_BUFFER_TOO_SMALL) { 119 status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 120 (void **)&pci_handle); 121 122 if (status != EFI_SUCCESS) { 123 efi_err("Failed to allocate memory for 'pci_handle'\n"); 124 return; 125 } 126 127 status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 128 &pci_proto, NULL, &size, pci_handle); 129 } 130 131 if (status != EFI_SUCCESS) 132 goto free_handle; 133 134 data = (struct setup_data *)(unsigned long)params->hdr.setup_data; 135 136 while (data && data->next) 137 data = (struct setup_data *)(unsigned long)data->next; 138 139 for_each_efi_handle(h, pci_handle, size, i) { 140 efi_pci_io_protocol_t *pci = NULL; 141 struct pci_setup_rom *rom; 142 143 status = efi_bs_call(handle_protocol, h, &pci_proto, 144 (void **)&pci); 145 if (status != EFI_SUCCESS || !pci) 146 continue; 147 148 status = preserve_pci_rom_image(pci, &rom); 149 if (status != EFI_SUCCESS) 150 continue; 151 152 if (data) 153 data->next = (unsigned long)rom; 154 else 155 params->hdr.setup_data = (unsigned long)rom; 156 157 data = (struct setup_data *)rom; 158 } 159 160free_handle: 161 efi_bs_call(free_pool, pci_handle); 162} 163 164static void retrieve_apple_device_properties(struct boot_params *boot_params) 165{ 166 efi_guid_t guid = APPLE_PROPERTIES_PROTOCOL_GUID; 167 struct setup_data *data, *new; 168 efi_status_t status; 169 u32 size = 0; 170 apple_properties_protocol_t *p; 171 172 status = efi_bs_call(locate_protocol, &guid, NULL, (void **)&p); 173 if (status != EFI_SUCCESS) 174 return; 175 176 if (efi_table_attr(p, version) != 0x10000) { 177 efi_err("Unsupported properties proto version\n"); 178 return; 179 } 180 181 efi_call_proto(p, get_all, NULL, &size); 182 if (!size) 183 return; 184 185 do { 186 status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, 187 size + sizeof(struct setup_data), 188 (void **)&new); 189 if (status != EFI_SUCCESS) { 190 efi_err("Failed to allocate memory for 'properties'\n"); 191 return; 192 } 193 194 status = efi_call_proto(p, get_all, new->data, &size); 195 196 if (status == EFI_BUFFER_TOO_SMALL) 197 efi_bs_call(free_pool, new); 198 } while (status == EFI_BUFFER_TOO_SMALL); 199 200 new->type = SETUP_APPLE_PROPERTIES; 201 new->len = size; 202 new->next = 0; 203 204 data = (struct setup_data *)(unsigned long)boot_params->hdr.setup_data; 205 if (!data) { 206 boot_params->hdr.setup_data = (unsigned long)new; 207 } else { 208 while (data->next) 209 data = (struct setup_data *)(unsigned long)data->next; 210 data->next = (unsigned long)new; 211 } 212} 213 214static const efi_char16_t apple[] = L"Apple"; 215 216static void setup_quirks(struct boot_params *boot_params) 217{ 218 efi_char16_t *fw_vendor = (efi_char16_t *)(unsigned long) 219 efi_table_attr(efi_system_table, fw_vendor); 220 221 if (!memcmp(fw_vendor, apple, sizeof(apple))) { 222 if (IS_ENABLED(CONFIG_APPLE_PROPERTIES)) 223 retrieve_apple_device_properties(boot_params); 224 } 225} 226 227/* 228 * See if we have Universal Graphics Adapter (UGA) protocol 229 */ 230static efi_status_t 231setup_uga(struct screen_info *si, efi_guid_t *uga_proto, unsigned long size) 232{ 233 efi_status_t status; 234 u32 width, height; 235 void **uga_handle = NULL; 236 efi_uga_draw_protocol_t *uga = NULL, *first_uga; 237 efi_handle_t handle; 238 int i; 239 240 status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 241 (void **)&uga_handle); 242 if (status != EFI_SUCCESS) 243 return status; 244 245 status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 246 uga_proto, NULL, &size, uga_handle); 247 if (status != EFI_SUCCESS) 248 goto free_handle; 249 250 height = 0; 251 width = 0; 252 253 first_uga = NULL; 254 for_each_efi_handle(handle, uga_handle, size, i) { 255 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID; 256 u32 w, h, depth, refresh; 257 void *pciio; 258 259 status = efi_bs_call(handle_protocol, handle, uga_proto, 260 (void **)&uga); 261 if (status != EFI_SUCCESS) 262 continue; 263 264 pciio = NULL; 265 efi_bs_call(handle_protocol, handle, &pciio_proto, &pciio); 266 267 status = efi_call_proto(uga, get_mode, &w, &h, &depth, &refresh); 268 if (status == EFI_SUCCESS && (!first_uga || pciio)) { 269 width = w; 270 height = h; 271 272 /* 273 * Once we've found a UGA supporting PCIIO, 274 * don't bother looking any further. 275 */ 276 if (pciio) 277 break; 278 279 first_uga = uga; 280 } 281 } 282 283 if (!width && !height) 284 goto free_handle; 285 286 /* EFI framebuffer */ 287 si->orig_video_isVGA = VIDEO_TYPE_EFI; 288 289 si->lfb_depth = 32; 290 si->lfb_width = width; 291 si->lfb_height = height; 292 293 si->red_size = 8; 294 si->red_pos = 16; 295 si->green_size = 8; 296 si->green_pos = 8; 297 si->blue_size = 8; 298 si->blue_pos = 0; 299 si->rsvd_size = 8; 300 si->rsvd_pos = 24; 301 302free_handle: 303 efi_bs_call(free_pool, uga_handle); 304 305 return status; 306} 307 308static void setup_graphics(struct boot_params *boot_params) 309{ 310 efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID; 311 struct screen_info *si; 312 efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID; 313 efi_status_t status; 314 unsigned long size; 315 void **gop_handle = NULL; 316 void **uga_handle = NULL; 317 318 si = &boot_params->screen_info; 319 memset(si, 0, sizeof(*si)); 320 321 size = 0; 322 status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 323 &graphics_proto, NULL, &size, gop_handle); 324 if (status == EFI_BUFFER_TOO_SMALL) 325 status = efi_setup_gop(si, &graphics_proto, size); 326 327 if (status != EFI_SUCCESS) { 328 size = 0; 329 status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 330 &uga_proto, NULL, &size, uga_handle); 331 if (status == EFI_BUFFER_TOO_SMALL) 332 setup_uga(si, &uga_proto, size); 333 } 334} 335 336 337static void __noreturn efi_exit(efi_handle_t handle, efi_status_t status) 338{ 339 efi_bs_call(exit, handle, status, 0, NULL); 340 for(;;) 341 asm("hlt"); 342} 343 344void startup_32(struct boot_params *boot_params); 345 346void __noreturn efi_stub_entry(efi_handle_t handle, 347 efi_system_table_t *sys_table_arg, 348 struct boot_params *boot_params); 349 350/* 351 * Because the x86 boot code expects to be passed a boot_params we 352 * need to create one ourselves (usually the bootloader would create 353 * one for us). 354 */ 355efi_status_t __efiapi efi_pe_entry(efi_handle_t handle, 356 efi_system_table_t *sys_table_arg) 357{ 358 struct boot_params *boot_params; 359 struct setup_header *hdr; 360 void *image_base; 361 efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID; 362 int options_size = 0; 363 efi_status_t status; 364 char *cmdline_ptr; 365 366 efi_system_table = sys_table_arg; 367 368 /* Check if we were booted by the EFI firmware */ 369 if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) 370 efi_exit(handle, EFI_INVALID_PARAMETER); 371 372 status = efi_bs_call(handle_protocol, handle, &proto, (void **)&image); 373 if (status != EFI_SUCCESS) { 374 efi_err("Failed to get handle for LOADED_IMAGE_PROTOCOL\n"); 375 efi_exit(handle, status); 376 } 377 378 image_base = efi_table_attr(image, image_base); 379 image_offset = (void *)startup_32 - image_base; 380 381 status = efi_allocate_pages(sizeof(struct boot_params), 382 (unsigned long *)&boot_params, ULONG_MAX); 383 if (status != EFI_SUCCESS) { 384 efi_err("Failed to allocate lowmem for boot params\n"); 385 efi_exit(handle, status); 386 } 387 388 memset(boot_params, 0x0, sizeof(struct boot_params)); 389 390 hdr = &boot_params->hdr; 391 392 /* Copy the setup header from the second sector to boot_params */ 393 memcpy(&hdr->jump, image_base + 512, 394 sizeof(struct setup_header) - offsetof(struct setup_header, jump)); 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 /* 418 * Disregard any setup data that was provided by the bootloader: 419 * setup_data could be pointing anywhere, and we have no way of 420 * authenticating or validating the payload. 421 */ 422 hdr->setup_data = 0; 423 424 efi_stub_entry(handle, sys_table_arg, boot_params); 425 /* not reached */ 426 427fail: 428 efi_free(sizeof(struct boot_params), (unsigned long)boot_params); 429 430 efi_exit(handle, status); 431} 432 433static void add_e820ext(struct boot_params *params, 434 struct setup_data *e820ext, u32 nr_entries) 435{ 436 struct setup_data *data; 437 438 e820ext->type = SETUP_E820_EXT; 439 e820ext->len = nr_entries * sizeof(struct boot_e820_entry); 440 e820ext->next = 0; 441 442 data = (struct setup_data *)(unsigned long)params->hdr.setup_data; 443 444 while (data && data->next) 445 data = (struct setup_data *)(unsigned long)data->next; 446 447 if (data) 448 data->next = (unsigned long)e820ext; 449 else 450 params->hdr.setup_data = (unsigned long)e820ext; 451} 452 453static efi_status_t 454setup_e820(struct boot_params *params, struct setup_data *e820ext, u32 e820ext_size) 455{ 456 struct boot_e820_entry *entry = params->e820_table; 457 struct efi_info *efi = ¶ms->efi_info; 458 struct boot_e820_entry *prev = NULL; 459 u32 nr_entries; 460 u32 nr_desc; 461 int i; 462 463 nr_entries = 0; 464 nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size; 465 466 for (i = 0; i < nr_desc; i++) { 467 efi_memory_desc_t *d; 468 unsigned int e820_type = 0; 469 unsigned long m = efi->efi_memmap; 470 471#ifdef CONFIG_X86_64 472 m |= (u64)efi->efi_memmap_hi << 32; 473#endif 474 475 d = efi_early_memdesc_ptr(m, efi->efi_memdesc_size, i); 476 switch (d->type) { 477 case EFI_RESERVED_TYPE: 478 case EFI_RUNTIME_SERVICES_CODE: 479 case EFI_RUNTIME_SERVICES_DATA: 480 case EFI_MEMORY_MAPPED_IO: 481 case EFI_MEMORY_MAPPED_IO_PORT_SPACE: 482 case EFI_PAL_CODE: 483 e820_type = E820_TYPE_RESERVED; 484 break; 485 486 case EFI_UNUSABLE_MEMORY: 487 e820_type = E820_TYPE_UNUSABLE; 488 break; 489 490 case EFI_ACPI_RECLAIM_MEMORY: 491 e820_type = E820_TYPE_ACPI; 492 break; 493 494 case EFI_LOADER_CODE: 495 case EFI_LOADER_DATA: 496 case EFI_BOOT_SERVICES_CODE: 497 case EFI_BOOT_SERVICES_DATA: 498 case EFI_CONVENTIONAL_MEMORY: 499 if (efi_soft_reserve_enabled() && 500 (d->attribute & EFI_MEMORY_SP)) 501 e820_type = E820_TYPE_SOFT_RESERVED; 502 else 503 e820_type = E820_TYPE_RAM; 504 break; 505 506 case EFI_ACPI_MEMORY_NVS: 507 e820_type = E820_TYPE_NVS; 508 break; 509 510 case EFI_PERSISTENT_MEMORY: 511 e820_type = E820_TYPE_PMEM; 512 break; 513 514 default: 515 continue; 516 } 517 518 /* Merge adjacent mappings */ 519 if (prev && prev->type == e820_type && 520 (prev->addr + prev->size) == d->phys_addr) { 521 prev->size += d->num_pages << 12; 522 continue; 523 } 524 525 if (nr_entries == ARRAY_SIZE(params->e820_table)) { 526 u32 need = (nr_desc - i) * sizeof(struct e820_entry) + 527 sizeof(struct setup_data); 528 529 if (!e820ext || e820ext_size < need) 530 return EFI_BUFFER_TOO_SMALL; 531 532 /* boot_params map full, switch to e820 extended */ 533 entry = (struct boot_e820_entry *)e820ext->data; 534 } 535 536 entry->addr = d->phys_addr; 537 entry->size = d->num_pages << PAGE_SHIFT; 538 entry->type = e820_type; 539 prev = entry++; 540 nr_entries++; 541 } 542 543 if (nr_entries > ARRAY_SIZE(params->e820_table)) { 544 u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_table); 545 546 add_e820ext(params, e820ext, nr_e820ext); 547 nr_entries -= nr_e820ext; 548 } 549 550 params->e820_entries = (u8)nr_entries; 551 552 return EFI_SUCCESS; 553} 554 555static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext, 556 u32 *e820ext_size) 557{ 558 efi_status_t status; 559 unsigned long size; 560 561 size = sizeof(struct setup_data) + 562 sizeof(struct e820_entry) * nr_desc; 563 564 if (*e820ext) { 565 efi_bs_call(free_pool, *e820ext); 566 *e820ext = NULL; 567 *e820ext_size = 0; 568 } 569 570 status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 571 (void **)e820ext); 572 if (status == EFI_SUCCESS) 573 *e820ext_size = size; 574 575 return status; 576} 577 578static efi_status_t allocate_e820(struct boot_params *params, 579 struct setup_data **e820ext, 580 u32 *e820ext_size) 581{ 582 unsigned long map_size, desc_size, map_key; 583 efi_status_t status; 584 __u32 nr_desc, desc_version; 585 586 /* Only need the size of the mem map and size of each mem descriptor */ 587 map_size = 0; 588 status = efi_bs_call(get_memory_map, &map_size, NULL, &map_key, 589 &desc_size, &desc_version); 590 if (status != EFI_BUFFER_TOO_SMALL) 591 return (status != EFI_SUCCESS) ? status : EFI_UNSUPPORTED; 592 593 nr_desc = map_size / desc_size + EFI_MMAP_NR_SLACK_SLOTS; 594 595 if (nr_desc > ARRAY_SIZE(params->e820_table)) { 596 u32 nr_e820ext = nr_desc - ARRAY_SIZE(params->e820_table); 597 598 status = alloc_e820ext(nr_e820ext, e820ext, e820ext_size); 599 if (status != EFI_SUCCESS) 600 return status; 601 } 602 603 return EFI_SUCCESS; 604} 605 606struct exit_boot_struct { 607 struct boot_params *boot_params; 608 struct efi_info *efi; 609}; 610 611static efi_status_t exit_boot_func(struct efi_boot_memmap *map, 612 void *priv) 613{ 614 const char *signature; 615 struct exit_boot_struct *p = priv; 616 617 signature = efi_is_64bit() ? EFI64_LOADER_SIGNATURE 618 : EFI32_LOADER_SIGNATURE; 619 memcpy(&p->efi->efi_loader_signature, signature, sizeof(__u32)); 620 621 efi_set_u64_split((unsigned long)efi_system_table, 622 &p->efi->efi_systab, &p->efi->efi_systab_hi); 623 p->efi->efi_memdesc_size = map->desc_size; 624 p->efi->efi_memdesc_version = map->desc_ver; 625 efi_set_u64_split((unsigned long)map->map, 626 &p->efi->efi_memmap, &p->efi->efi_memmap_hi); 627 p->efi->efi_memmap_size = map->map_size; 628 629 return EFI_SUCCESS; 630} 631 632static efi_status_t exit_boot(struct boot_params *boot_params, void *handle) 633{ 634 struct setup_data *e820ext = NULL; 635 __u32 e820ext_size = 0; 636 efi_status_t status; 637 struct exit_boot_struct priv; 638 639 priv.boot_params = boot_params; 640 priv.efi = &boot_params->efi_info; 641 642 status = allocate_e820(boot_params, &e820ext, &e820ext_size); 643 if (status != EFI_SUCCESS) 644 return status; 645 646 /* Might as well exit boot services now */ 647 status = efi_exit_boot_services(handle, &priv, exit_boot_func); 648 if (status != EFI_SUCCESS) 649 return status; 650 651 /* Historic? */ 652 boot_params->alt_mem_k = 32 * 1024; 653 654 status = setup_e820(boot_params, e820ext, e820ext_size); 655 if (status != EFI_SUCCESS) 656 return status; 657 658 return EFI_SUCCESS; 659} 660 661/* 662 * On success, we return the address of startup_32, which has potentially been 663 * relocated by efi_relocate_kernel. 664 * On failure, we exit to the firmware via efi_exit instead of returning. 665 */ 666unsigned long efi_main(efi_handle_t handle, 667 efi_system_table_t *sys_table_arg, 668 struct boot_params *boot_params) 669{ 670 unsigned long bzimage_addr = (unsigned long)startup_32; 671 unsigned long buffer_start, buffer_end; 672 struct setup_header *hdr = &boot_params->hdr; 673 const struct linux_efi_initrd *initrd = NULL; 674 efi_status_t status; 675 676 efi_system_table = sys_table_arg; 677 678 /* Check if we were booted by the EFI firmware */ 679 if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) 680 efi_exit(handle, EFI_INVALID_PARAMETER); 681 682 /* 683 * If the kernel isn't already loaded at a suitable address, 684 * relocate it. 685 * 686 * It must be loaded above LOAD_PHYSICAL_ADDR. 687 * 688 * The maximum address for 64-bit is 1 << 46 for 4-level paging. This 689 * is defined as the macro MAXMEM, but unfortunately that is not a 690 * compile-time constant if 5-level paging is configured, so we instead 691 * define our own macro for use here. 692 * 693 * For 32-bit, the maximum address is complicated to figure out, for 694 * now use KERNEL_IMAGE_SIZE, which will be 512MiB, the same as what 695 * KASLR uses. 696 * 697 * Also relocate it if image_offset is zero, i.e. the kernel wasn't 698 * loaded by LoadImage, but rather by a bootloader that called the 699 * handover entry. The reason we must always relocate in this case is 700 * to handle the case of systemd-boot booting a unified kernel image, 701 * which is a PE executable that contains the bzImage and an initrd as 702 * COFF sections. The initrd section is placed after the bzImage 703 * without ensuring that there are at least init_size bytes available 704 * for the bzImage, and thus the compressed kernel's startup code may 705 * overwrite the initrd unless it is moved out of the way. 706 */ 707 708 buffer_start = ALIGN(bzimage_addr - image_offset, 709 hdr->kernel_alignment); 710 buffer_end = buffer_start + hdr->init_size; 711 712 if ((buffer_start < LOAD_PHYSICAL_ADDR) || 713 (IS_ENABLED(CONFIG_X86_32) && buffer_end > KERNEL_IMAGE_SIZE) || 714 (IS_ENABLED(CONFIG_X86_64) && buffer_end > MAXMEM_X86_64_4LEVEL) || 715 (image_offset == 0)) { 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_err("efi_relocate_kernel() failed!\n"); 723 goto fail; 724 } 725 /* 726 * Now that we've copied the kernel elsewhere, we no longer 727 * have a set up block before startup_32(), so reset image_offset 728 * to zero in case it was set earlier. 729 */ 730 image_offset = 0; 731 } 732 733#ifdef CONFIG_CMDLINE_BOOL 734 status = efi_parse_options(CONFIG_CMDLINE); 735 if (status != EFI_SUCCESS) { 736 efi_err("Failed to parse options\n"); 737 goto fail; 738 } 739#endif 740 if (!IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) { 741 unsigned long cmdline_paddr = ((u64)hdr->cmd_line_ptr | 742 ((u64)boot_params->ext_cmd_line_ptr << 32)); 743 status = efi_parse_options((char *)cmdline_paddr); 744 if (status != EFI_SUCCESS) { 745 efi_err("Failed to parse options\n"); 746 goto fail; 747 } 748 } 749 750 /* 751 * At this point, an initrd may already have been loaded by the 752 * bootloader and passed via bootparams. We permit an initrd loaded 753 * from the LINUX_EFI_INITRD_MEDIA_GUID device path to supersede it. 754 * 755 * If the device path is not present, any command-line initrd= 756 * arguments will be processed only if image is not NULL, which will be 757 * the case only if we were loaded via the PE entry point. 758 */ 759 if (!efi_noinitrd) { 760 unsigned long addr, size; 761 762 status = efi_load_initrd(image, hdr->initrd_addr_max, ULONG_MAX, 763 &initrd); 764 765 if (status != EFI_SUCCESS) { 766 efi_err("Failed to load initrd!\n"); 767 goto fail; 768 } 769 if (initrd && initrd->size > 0) { 770 efi_set_u64_split(initrd->base, &hdr->ramdisk_image, 771 &boot_params->ext_ramdisk_image); 772 efi_set_u64_split(initrd->size, &hdr->ramdisk_size, 773 &boot_params->ext_ramdisk_size); 774 } 775 } 776 777 /* 778 * If the boot loader gave us a value for secure_boot then we use that, 779 * otherwise we ask the BIOS. 780 */ 781 if (boot_params->secure_boot == efi_secureboot_mode_unset) 782 boot_params->secure_boot = efi_get_secureboot(); 783 784 /* Ask the firmware to clear memory on unclean shutdown */ 785 efi_enable_reset_attack_mitigation(); 786 787 efi_random_get_seed(); 788 789 efi_retrieve_tpm2_eventlog(); 790 791 setup_graphics(boot_params); 792 793 setup_efi_pci(boot_params); 794 795 setup_quirks(boot_params); 796 797 status = exit_boot(boot_params, handle); 798 if (status != EFI_SUCCESS) { 799 efi_err("exit_boot() failed!\n"); 800 goto fail; 801 } 802 803 return bzimage_addr; 804fail: 805 efi_err("efi_main() failed!\n"); 806 807 efi_exit(handle, status); 808} 809