1 // SPDX-License-Identifier: GPL-2.0-only
3 /* -----------------------------------------------------------------------
5 * Copyright 2011 Intel Corporation; author Matt Fleming
7 * ----------------------------------------------------------------------- */
10 #include <linux/pci.h>
11 #include <linux/stddef.h>
14 #include <asm/e820/types.h>
15 #include <asm/setup.h>
18 #include <asm/kaslr.h>
24 extern char _bss[], _ebss[];
26 const efi_system_table_t *efi_system_table;
27 const efi_dxe_services_table_t *efi_dxe_table;
28 static efi_loaded_image_t *image = NULL;
29 static efi_memory_attribute_protocol_t *memattr;
31 typedef union sev_memory_acceptance_protocol sev_memory_acceptance_protocol_t;
32 union sev_memory_acceptance_protocol {
34 efi_status_t (__efiapi * allow_unaccepted_memory)(
35 sev_memory_acceptance_protocol_t *);
38 u32 allow_unaccepted_memory;
43 preserve_pci_rom_image(efi_pci_io_protocol_t *pci, struct pci_setup_rom **__rom)
45 struct pci_setup_rom *rom = NULL;
52 * Some firmware images contain EFI function pointers at the place where
53 * the romimage and romsize fields are supposed to be. Typically the EFI
54 * code is mapped at high addresses, translating to an unrealistically
55 * large romsize. The UEFI spec limits the size of option ROMs to 16
56 * MiB so we reject any ROMs over 16 MiB in size to catch this.
58 romimage = efi_table_attr(pci, romimage);
59 romsize = efi_table_attr(pci, romsize);
60 if (!romimage || !romsize || romsize > SZ_16M)
61 return EFI_INVALID_PARAMETER;
63 size = romsize + sizeof(*rom);
65 status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
67 if (status != EFI_SUCCESS) {
68 efi_err("Failed to allocate memory for 'rom'\n");
72 memset(rom, 0, sizeof(*rom));
74 rom->data.type = SETUP_PCI;
75 rom->data.len = size - sizeof(struct setup_data);
77 rom->pcilen = romsize;
80 status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16,
81 PCI_VENDOR_ID, 1, &rom->vendor);
83 if (status != EFI_SUCCESS) {
84 efi_err("Failed to read rom->vendor\n");
88 status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16,
89 PCI_DEVICE_ID, 1, &rom->devid);
91 if (status != EFI_SUCCESS) {
92 efi_err("Failed to read rom->devid\n");
96 status = efi_call_proto(pci, get_location, &rom->segment, &rom->bus,
97 &rom->device, &rom->function);
99 if (status != EFI_SUCCESS)
102 memcpy(rom->romdata, romimage, romsize);
106 efi_bs_call(free_pool, rom);
111 * There's no way to return an informative status from this function,
112 * because any analysis (and printing of error messages) needs to be
113 * done directly at the EFI function call-site.
115 * For example, EFI_INVALID_PARAMETER could indicate a bug or maybe we
116 * just didn't find any PCI devices, but there's no way to tell outside
117 * the context of the call.
119 static void setup_efi_pci(struct boot_params *params)
122 void **pci_handle = NULL;
123 efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
124 unsigned long size = 0;
125 struct setup_data *data;
129 status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
130 &pci_proto, NULL, &size, pci_handle);
132 if (status == EFI_BUFFER_TOO_SMALL) {
133 status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
134 (void **)&pci_handle);
136 if (status != EFI_SUCCESS) {
137 efi_err("Failed to allocate memory for 'pci_handle'\n");
141 status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
142 &pci_proto, NULL, &size, pci_handle);
145 if (status != EFI_SUCCESS)
148 data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
150 while (data && data->next)
151 data = (struct setup_data *)(unsigned long)data->next;
153 for_each_efi_handle(h, pci_handle, size, i) {
154 efi_pci_io_protocol_t *pci = NULL;
155 struct pci_setup_rom *rom;
157 status = efi_bs_call(handle_protocol, h, &pci_proto,
159 if (status != EFI_SUCCESS || !pci)
162 status = preserve_pci_rom_image(pci, &rom);
163 if (status != EFI_SUCCESS)
167 data->next = (unsigned long)rom;
169 params->hdr.setup_data = (unsigned long)rom;
171 data = (struct setup_data *)rom;
175 efi_bs_call(free_pool, pci_handle);
178 static void retrieve_apple_device_properties(struct boot_params *boot_params)
180 efi_guid_t guid = APPLE_PROPERTIES_PROTOCOL_GUID;
181 struct setup_data *data, *new;
184 apple_properties_protocol_t *p;
186 status = efi_bs_call(locate_protocol, &guid, NULL, (void **)&p);
187 if (status != EFI_SUCCESS)
190 if (efi_table_attr(p, version) != 0x10000) {
191 efi_err("Unsupported properties proto version\n");
195 efi_call_proto(p, get_all, NULL, &size);
200 status = efi_bs_call(allocate_pool, EFI_LOADER_DATA,
201 size + sizeof(struct setup_data),
203 if (status != EFI_SUCCESS) {
204 efi_err("Failed to allocate memory for 'properties'\n");
208 status = efi_call_proto(p, get_all, new->data, &size);
210 if (status == EFI_BUFFER_TOO_SMALL)
211 efi_bs_call(free_pool, new);
212 } while (status == EFI_BUFFER_TOO_SMALL);
214 new->type = SETUP_APPLE_PROPERTIES;
218 data = (struct setup_data *)(unsigned long)boot_params->hdr.setup_data;
220 boot_params->hdr.setup_data = (unsigned long)new;
223 data = (struct setup_data *)(unsigned long)data->next;
224 data->next = (unsigned long)new;
228 static bool apple_match_product_name(void)
230 static const char type1_product_matches[][15] = {
240 const struct efi_smbios_type1_record *record;
243 record = (struct efi_smbios_type1_record *)efi_get_smbios_record(1);
247 product = efi_get_smbios_string(record, product_name);
251 for (int i = 0; i < ARRAY_SIZE(type1_product_matches); i++) {
252 if (!strcmp(product, type1_product_matches[i]))
259 static void apple_set_os(void)
262 unsigned long version;
263 efi_status_t (__efiapi *set_os_version)(const char *);
264 efi_status_t (__efiapi *set_os_vendor)(const char *);
268 if (!efi_is_64bit() || !apple_match_product_name())
271 status = efi_bs_call(locate_protocol, &APPLE_SET_OS_PROTOCOL_GUID, NULL,
273 if (status != EFI_SUCCESS)
276 if (set_os->version >= 2) {
277 status = set_os->set_os_vendor("Apple Inc.");
278 if (status != EFI_SUCCESS)
279 efi_err("Failed to set OS vendor via apple_set_os\n");
282 if (set_os->version > 0) {
283 /* The version being set doesn't seem to matter */
284 status = set_os->set_os_version("Mac OS X 10.9");
285 if (status != EFI_SUCCESS)
286 efi_err("Failed to set OS version via apple_set_os\n");
290 efi_status_t efi_adjust_memory_range_protection(unsigned long start,
294 efi_gcd_memory_space_desc_t desc;
295 unsigned long end, next;
296 unsigned long rounded_start, rounded_end;
297 unsigned long unprotect_start, unprotect_size;
299 rounded_start = rounddown(start, EFI_PAGE_SIZE);
300 rounded_end = roundup(start + size, EFI_PAGE_SIZE);
302 if (memattr != NULL) {
303 status = efi_call_proto(memattr, set_memory_attributes,
305 rounded_end - rounded_start,
307 if (status != EFI_SUCCESS) {
308 efi_warn("Failed to set EFI_MEMORY_RO attribute\n");
312 status = efi_call_proto(memattr, clear_memory_attributes,
314 rounded_end - rounded_start,
316 if (status != EFI_SUCCESS)
317 efi_warn("Failed to clear EFI_MEMORY_XP attribute\n");
321 if (efi_dxe_table == NULL)
325 * Don't modify memory region attributes, they are
326 * already suitable, to lower the possibility to
327 * encounter firmware bugs.
330 for (end = start + size; start < end; start = next) {
332 status = efi_dxe_call(get_memory_space_descriptor, start, &desc);
334 if (status != EFI_SUCCESS)
337 next = desc.base_address + desc.length;
340 * Only system memory is suitable for trampoline/kernel image placement,
341 * so only this type of memory needs its attributes to be modified.
344 if (desc.gcd_memory_type != EfiGcdMemoryTypeSystemMemory ||
345 (desc.attributes & (EFI_MEMORY_RO | EFI_MEMORY_XP)) == 0)
348 unprotect_start = max(rounded_start, (unsigned long)desc.base_address);
349 unprotect_size = min(rounded_end, next) - unprotect_start;
351 status = efi_dxe_call(set_memory_space_attributes,
352 unprotect_start, unprotect_size,
355 if (status != EFI_SUCCESS) {
356 efi_warn("Unable to unprotect memory range [%08lx,%08lx]: %lx\n",
358 unprotect_start + unprotect_size,
366 static void setup_unaccepted_memory(void)
368 efi_guid_t mem_acceptance_proto = OVMF_SEV_MEMORY_ACCEPTANCE_PROTOCOL_GUID;
369 sev_memory_acceptance_protocol_t *proto;
372 if (!IS_ENABLED(CONFIG_UNACCEPTED_MEMORY))
376 * Enable unaccepted memory before calling exit boot services in order
377 * for the UEFI to not accept all memory on EBS.
379 status = efi_bs_call(locate_protocol, &mem_acceptance_proto, NULL,
381 if (status != EFI_SUCCESS)
384 status = efi_call_proto(proto, allow_unaccepted_memory);
385 if (status != EFI_SUCCESS)
386 efi_err("Memory acceptance protocol failed\n");
389 static efi_char16_t *efistub_fw_vendor(void)
391 unsigned long vendor = efi_table_attr(efi_system_table, fw_vendor);
393 return (efi_char16_t *)vendor;
396 static const efi_char16_t apple[] = L"Apple";
398 static void setup_quirks(struct boot_params *boot_params)
400 if (!memcmp(efistub_fw_vendor(), apple, sizeof(apple))) {
401 if (IS_ENABLED(CONFIG_APPLE_PROPERTIES))
402 retrieve_apple_device_properties(boot_params);
409 * See if we have Universal Graphics Adapter (UGA) protocol
412 setup_uga(struct screen_info *si, efi_guid_t *uga_proto, unsigned long size)
416 void **uga_handle = NULL;
417 efi_uga_draw_protocol_t *uga = NULL, *first_uga;
421 status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
422 (void **)&uga_handle);
423 if (status != EFI_SUCCESS)
426 status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
427 uga_proto, NULL, &size, uga_handle);
428 if (status != EFI_SUCCESS)
435 for_each_efi_handle(handle, uga_handle, size, i) {
436 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
437 u32 w, h, depth, refresh;
440 status = efi_bs_call(handle_protocol, handle, uga_proto,
442 if (status != EFI_SUCCESS)
446 efi_bs_call(handle_protocol, handle, &pciio_proto, &pciio);
448 status = efi_call_proto(uga, get_mode, &w, &h, &depth, &refresh);
449 if (status == EFI_SUCCESS && (!first_uga || pciio)) {
454 * Once we've found a UGA supporting PCIIO,
455 * don't bother looking any further.
464 if (!width && !height)
467 /* EFI framebuffer */
468 si->orig_video_isVGA = VIDEO_TYPE_EFI;
471 si->lfb_width = width;
472 si->lfb_height = height;
484 efi_bs_call(free_pool, uga_handle);
489 static void setup_graphics(struct boot_params *boot_params)
491 efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
492 struct screen_info *si;
493 efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
496 void **gop_handle = NULL;
497 void **uga_handle = NULL;
499 si = &boot_params->screen_info;
500 memset(si, 0, sizeof(*si));
503 status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
504 &graphics_proto, NULL, &size, gop_handle);
505 if (status == EFI_BUFFER_TOO_SMALL)
506 status = efi_setup_gop(si, &graphics_proto, size);
508 if (status != EFI_SUCCESS) {
510 status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
511 &uga_proto, NULL, &size, uga_handle);
512 if (status == EFI_BUFFER_TOO_SMALL)
513 setup_uga(si, &uga_proto, size);
518 static void __noreturn efi_exit(efi_handle_t handle, efi_status_t status)
520 efi_bs_call(exit, handle, status, 0, NULL);
525 void __noreturn efi_stub_entry(efi_handle_t handle,
526 efi_system_table_t *sys_table_arg,
527 struct boot_params *boot_params);
530 * Because the x86 boot code expects to be passed a boot_params we
531 * need to create one ourselves (usually the bootloader would create
534 efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
535 efi_system_table_t *sys_table_arg)
537 efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
538 struct boot_params *boot_params;
539 struct setup_header *hdr;
540 int options_size = 0;
545 efi_system_table = sys_table_arg;
547 /* Check if we were booted by the EFI firmware */
548 if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
549 efi_exit(handle, EFI_INVALID_PARAMETER);
551 status = efi_bs_call(handle_protocol, handle, &proto, (void **)&image);
552 if (status != EFI_SUCCESS) {
553 efi_err("Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
554 efi_exit(handle, status);
557 status = efi_allocate_pages(PARAM_SIZE, &alloc, ULONG_MAX);
558 if (status != EFI_SUCCESS)
559 efi_exit(handle, status);
561 boot_params = memset((void *)alloc, 0x0, PARAM_SIZE);
562 hdr = &boot_params->hdr;
564 /* Assign the setup_header fields that the kernel actually cares about */
566 hdr->vid_mode = 0xffff;
568 hdr->type_of_loader = 0x21;
569 hdr->initrd_addr_max = INT_MAX;
571 /* Convert unicode cmdline to ascii */
572 cmdline_ptr = efi_convert_cmdline(image, &options_size);
574 efi_free(PARAM_SIZE, alloc);
575 efi_exit(handle, EFI_OUT_OF_RESOURCES);
578 efi_set_u64_split((unsigned long)cmdline_ptr, &hdr->cmd_line_ptr,
579 &boot_params->ext_cmd_line_ptr);
581 efi_stub_entry(handle, sys_table_arg, boot_params);
585 static void add_e820ext(struct boot_params *params,
586 struct setup_data *e820ext, u32 nr_entries)
588 struct setup_data *data;
590 e820ext->type = SETUP_E820_EXT;
591 e820ext->len = nr_entries * sizeof(struct boot_e820_entry);
594 data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
596 while (data && data->next)
597 data = (struct setup_data *)(unsigned long)data->next;
600 data->next = (unsigned long)e820ext;
602 params->hdr.setup_data = (unsigned long)e820ext;
606 setup_e820(struct boot_params *params, struct setup_data *e820ext, u32 e820ext_size)
608 struct boot_e820_entry *entry = params->e820_table;
609 struct efi_info *efi = ¶ms->efi_info;
610 struct boot_e820_entry *prev = NULL;
616 nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size;
618 for (i = 0; i < nr_desc; i++) {
619 efi_memory_desc_t *d;
620 unsigned int e820_type = 0;
621 unsigned long m = efi->efi_memmap;
624 m |= (u64)efi->efi_memmap_hi << 32;
627 d = efi_memdesc_ptr(m, efi->efi_memdesc_size, i);
629 case EFI_RESERVED_TYPE:
630 case EFI_RUNTIME_SERVICES_CODE:
631 case EFI_RUNTIME_SERVICES_DATA:
632 case EFI_MEMORY_MAPPED_IO:
633 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
635 e820_type = E820_TYPE_RESERVED;
638 case EFI_UNUSABLE_MEMORY:
639 e820_type = E820_TYPE_UNUSABLE;
642 case EFI_ACPI_RECLAIM_MEMORY:
643 e820_type = E820_TYPE_ACPI;
646 case EFI_LOADER_CODE:
647 case EFI_LOADER_DATA:
648 case EFI_BOOT_SERVICES_CODE:
649 case EFI_BOOT_SERVICES_DATA:
650 case EFI_CONVENTIONAL_MEMORY:
651 if (efi_soft_reserve_enabled() &&
652 (d->attribute & EFI_MEMORY_SP))
653 e820_type = E820_TYPE_SOFT_RESERVED;
655 e820_type = E820_TYPE_RAM;
658 case EFI_ACPI_MEMORY_NVS:
659 e820_type = E820_TYPE_NVS;
662 case EFI_PERSISTENT_MEMORY:
663 e820_type = E820_TYPE_PMEM;
666 case EFI_UNACCEPTED_MEMORY:
667 if (!IS_ENABLED(CONFIG_UNACCEPTED_MEMORY))
669 e820_type = E820_TYPE_RAM;
670 process_unaccepted_memory(d->phys_addr,
671 d->phys_addr + PAGE_SIZE * d->num_pages);
677 /* Merge adjacent mappings */
678 if (prev && prev->type == e820_type &&
679 (prev->addr + prev->size) == d->phys_addr) {
680 prev->size += d->num_pages << 12;
684 if (nr_entries == ARRAY_SIZE(params->e820_table)) {
685 u32 need = (nr_desc - i) * sizeof(struct e820_entry) +
686 sizeof(struct setup_data);
688 if (!e820ext || e820ext_size < need)
689 return EFI_BUFFER_TOO_SMALL;
691 /* boot_params map full, switch to e820 extended */
692 entry = (struct boot_e820_entry *)e820ext->data;
695 entry->addr = d->phys_addr;
696 entry->size = d->num_pages << PAGE_SHIFT;
697 entry->type = e820_type;
702 if (nr_entries > ARRAY_SIZE(params->e820_table)) {
703 u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_table);
705 add_e820ext(params, e820ext, nr_e820ext);
706 nr_entries -= nr_e820ext;
709 params->e820_entries = (u8)nr_entries;
714 static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext,
720 size = sizeof(struct setup_data) +
721 sizeof(struct e820_entry) * nr_desc;
724 efi_bs_call(free_pool, *e820ext);
729 status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
731 if (status == EFI_SUCCESS)
732 *e820ext_size = size;
737 static efi_status_t allocate_e820(struct boot_params *params,
738 struct setup_data **e820ext,
741 struct efi_boot_memmap *map;
745 status = efi_get_memory_map(&map, false);
746 if (status != EFI_SUCCESS)
749 nr_desc = map->map_size / map->desc_size;
750 if (nr_desc > ARRAY_SIZE(params->e820_table) - EFI_MMAP_NR_SLACK_SLOTS) {
751 u32 nr_e820ext = nr_desc - ARRAY_SIZE(params->e820_table) +
752 EFI_MMAP_NR_SLACK_SLOTS;
754 status = alloc_e820ext(nr_e820ext, e820ext, e820ext_size);
757 if (IS_ENABLED(CONFIG_UNACCEPTED_MEMORY) && status == EFI_SUCCESS)
758 status = allocate_unaccepted_bitmap(nr_desc, map);
760 efi_bs_call(free_pool, map);
764 struct exit_boot_struct {
765 struct boot_params *boot_params;
766 struct efi_info *efi;
769 static efi_status_t exit_boot_func(struct efi_boot_memmap *map,
772 const char *signature;
773 struct exit_boot_struct *p = priv;
775 signature = efi_is_64bit() ? EFI64_LOADER_SIGNATURE
776 : EFI32_LOADER_SIGNATURE;
777 memcpy(&p->efi->efi_loader_signature, signature, sizeof(__u32));
779 efi_set_u64_split((unsigned long)efi_system_table,
780 &p->efi->efi_systab, &p->efi->efi_systab_hi);
781 p->efi->efi_memdesc_size = map->desc_size;
782 p->efi->efi_memdesc_version = map->desc_ver;
783 efi_set_u64_split((unsigned long)map->map,
784 &p->efi->efi_memmap, &p->efi->efi_memmap_hi);
785 p->efi->efi_memmap_size = map->map_size;
790 static efi_status_t exit_boot(struct boot_params *boot_params, void *handle)
792 struct setup_data *e820ext = NULL;
793 __u32 e820ext_size = 0;
795 struct exit_boot_struct priv;
797 priv.boot_params = boot_params;
798 priv.efi = &boot_params->efi_info;
800 status = allocate_e820(boot_params, &e820ext, &e820ext_size);
801 if (status != EFI_SUCCESS)
804 /* Might as well exit boot services now */
805 status = efi_exit_boot_services(handle, &priv, exit_boot_func);
806 if (status != EFI_SUCCESS)
810 boot_params->alt_mem_k = 32 * 1024;
812 status = setup_e820(boot_params, e820ext, e820ext_size);
813 if (status != EFI_SUCCESS)
819 static bool have_unsupported_snp_features(void)
823 unsupported = snp_get_unsupported_features(sev_get_status());
825 efi_err("Unsupported SEV-SNP features detected: 0x%llx\n",
832 static void efi_get_seed(void *seed, int size)
834 efi_get_random_bytes(size, seed);
837 * This only updates seed[0] when running on 32-bit, but in that case,
838 * seed[1] is not used anyway, as there is no virtual KASLR on 32-bit.
840 *(unsigned long *)seed ^= kaslr_get_random_long("EFI");
843 static void error(char *str)
845 efi_warn("Decompression failed: %s\n", str);
848 static const char *cmdline_memmap_override;
850 static efi_status_t parse_options(const char *cmdline)
852 static const char opts[][14] = {
853 "mem=", "memmap=", "hugepages="
856 for (int i = 0; i < ARRAY_SIZE(opts); i++) {
857 const char *p = strstr(cmdline, opts[i]);
859 if (p == cmdline || (p > cmdline && isspace(p[-1]))) {
860 cmdline_memmap_override = opts[i];
865 return efi_parse_options(cmdline);
868 static efi_status_t efi_decompress_kernel(unsigned long *kernel_entry)
870 unsigned long virt_addr = LOAD_PHYSICAL_ADDR;
871 unsigned long addr, alloc_size, entry;
875 /* determine the required size of the allocation */
876 alloc_size = ALIGN(max_t(unsigned long, output_len, kernel_total_size),
879 if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && !efi_nokaslr) {
880 u64 range = KERNEL_IMAGE_SIZE - LOAD_PHYSICAL_ADDR - kernel_total_size;
881 static const efi_char16_t ami[] = L"American Megatrends";
883 efi_get_seed(seed, sizeof(seed));
885 virt_addr += (range * seed[1]) >> 32;
886 virt_addr &= ~(CONFIG_PHYSICAL_ALIGN - 1);
889 * Older Dell systems with AMI UEFI firmware v2.0 may hang
890 * while decompressing the kernel if physical address
891 * randomization is enabled.
893 * https://bugzilla.kernel.org/show_bug.cgi?id=218173
895 if (efi_system_table->hdr.revision <= EFI_2_00_SYSTEM_TABLE_REVISION &&
896 !memcmp(efistub_fw_vendor(), ami, sizeof(ami))) {
897 efi_debug("AMI firmware v2.0 or older detected - disabling physical KASLR\n");
899 } else if (cmdline_memmap_override) {
900 efi_info("%s detected on the kernel command line - disabling physical KASLR\n",
901 cmdline_memmap_override);
905 boot_params_ptr->hdr.loadflags |= KASLR_FLAG;
908 status = efi_random_alloc(alloc_size, CONFIG_PHYSICAL_ALIGN, &addr,
909 seed[0], EFI_LOADER_CODE,
911 EFI_X86_KERNEL_ALLOC_LIMIT);
912 if (status != EFI_SUCCESS)
915 entry = decompress_kernel((void *)addr, virt_addr, error);
916 if (entry == ULONG_MAX) {
917 efi_free(alloc_size, addr);
918 return EFI_LOAD_ERROR;
921 *kernel_entry = addr + entry;
923 return efi_adjust_memory_range_protection(addr, kernel_text_size);
926 static void __noreturn enter_kernel(unsigned long kernel_addr,
927 struct boot_params *boot_params)
929 /* enter decompressed kernel with boot_params pointer in RSI/ESI */
930 asm("jmp *%0"::"r"(kernel_addr), "S"(boot_params));
936 * On success, this routine will jump to the relocated image directly and never
937 * return. On failure, it will exit to the firmware via efi_exit() instead of
940 void __noreturn efi_stub_entry(efi_handle_t handle,
941 efi_system_table_t *sys_table_arg,
942 struct boot_params *boot_params)
944 efi_guid_t guid = EFI_MEMORY_ATTRIBUTE_PROTOCOL_GUID;
945 struct setup_header *hdr = &boot_params->hdr;
946 const struct linux_efi_initrd *initrd = NULL;
947 unsigned long kernel_entry;
950 boot_params_ptr = boot_params;
952 efi_system_table = sys_table_arg;
953 /* Check if we were booted by the EFI firmware */
954 if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
955 efi_exit(handle, EFI_INVALID_PARAMETER);
957 if (have_unsupported_snp_features())
958 efi_exit(handle, EFI_UNSUPPORTED);
960 if (IS_ENABLED(CONFIG_EFI_DXE_MEM_ATTRIBUTES)) {
961 efi_dxe_table = get_efi_config_table(EFI_DXE_SERVICES_TABLE_GUID);
963 efi_dxe_table->hdr.signature != EFI_DXE_SERVICES_TABLE_SIGNATURE) {
964 efi_warn("Ignoring DXE services table: invalid signature\n");
965 efi_dxe_table = NULL;
969 /* grab the memory attributes protocol if it exists */
970 efi_bs_call(locate_protocol, &guid, NULL, (void **)&memattr);
972 status = efi_setup_5level_paging();
973 if (status != EFI_SUCCESS) {
974 efi_err("efi_setup_5level_paging() failed!\n");
978 #ifdef CONFIG_CMDLINE_BOOL
979 status = parse_options(CONFIG_CMDLINE);
980 if (status != EFI_SUCCESS) {
981 efi_err("Failed to parse options\n");
985 if (!IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) {
986 unsigned long cmdline_paddr = ((u64)hdr->cmd_line_ptr |
987 ((u64)boot_params->ext_cmd_line_ptr << 32));
988 status = parse_options((char *)cmdline_paddr);
989 if (status != EFI_SUCCESS) {
990 efi_err("Failed to parse options\n");
995 if (efi_mem_encrypt > 0)
996 hdr->xloadflags |= XLF_MEM_ENCRYPTION;
998 status = efi_decompress_kernel(&kernel_entry);
999 if (status != EFI_SUCCESS) {
1000 efi_err("Failed to decompress kernel\n");
1005 * At this point, an initrd may already have been loaded by the
1006 * bootloader and passed via bootparams. We permit an initrd loaded
1007 * from the LINUX_EFI_INITRD_MEDIA_GUID device path to supersede it.
1009 * If the device path is not present, any command-line initrd=
1010 * arguments will be processed only if image is not NULL, which will be
1011 * the case only if we were loaded via the PE entry point.
1013 status = efi_load_initrd(image, hdr->initrd_addr_max, ULONG_MAX,
1015 if (status != EFI_SUCCESS)
1017 if (initrd && initrd->size > 0) {
1018 efi_set_u64_split(initrd->base, &hdr->ramdisk_image,
1019 &boot_params->ext_ramdisk_image);
1020 efi_set_u64_split(initrd->size, &hdr->ramdisk_size,
1021 &boot_params->ext_ramdisk_size);
1026 * If the boot loader gave us a value for secure_boot then we use that,
1027 * otherwise we ask the BIOS.
1029 if (boot_params->secure_boot == efi_secureboot_mode_unset)
1030 boot_params->secure_boot = efi_get_secureboot();
1032 /* Ask the firmware to clear memory on unclean shutdown */
1033 efi_enable_reset_attack_mitigation();
1035 efi_random_get_seed();
1037 efi_retrieve_eventlog();
1039 setup_graphics(boot_params);
1041 setup_efi_pci(boot_params);
1043 setup_quirks(boot_params);
1045 setup_unaccepted_memory();
1047 status = exit_boot(boot_params, handle);
1048 if (status != EFI_SUCCESS) {
1049 efi_err("exit_boot() failed!\n");
1054 * Call the SEV init code while still running with the firmware's
1055 * GDT/IDT, so #VC exceptions will be handled by EFI.
1057 sev_enable(boot_params);
1059 efi_5level_switch();
1061 enter_kernel(kernel_entry, boot_params);
1063 efi_err("efi_stub_entry() failed!\n");
1065 efi_exit(handle, status);
1068 #ifdef CONFIG_EFI_HANDOVER_PROTOCOL
1069 void efi_handover_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg,
1070 struct boot_params *boot_params)
1072 memset(_bss, 0, _ebss - _bss);
1073 efi_stub_entry(handle, sys_table_arg, boot_params);
1076 #ifndef CONFIG_EFI_MIXED
1077 extern __alias(efi_handover_entry)
1078 void efi32_stub_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg,
1079 struct boot_params *boot_params);
1081 extern __alias(efi_handover_entry)
1082 void efi64_stub_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg,
1083 struct boot_params *boot_params);