1c2d0b470SArd Biesheuvel // SPDX-License-Identifier: GPL-2.0-only 2c2d0b470SArd Biesheuvel 3c2d0b470SArd Biesheuvel /* ----------------------------------------------------------------------- 4c2d0b470SArd Biesheuvel * 5c2d0b470SArd Biesheuvel * Copyright 2011 Intel Corporation; author Matt Fleming 6c2d0b470SArd Biesheuvel * 7c2d0b470SArd Biesheuvel * ----------------------------------------------------------------------- */ 8c2d0b470SArd Biesheuvel 9c2d0b470SArd Biesheuvel #include <linux/efi.h> 10c2d0b470SArd Biesheuvel #include <linux/pci.h> 1159476f80SArvind Sankar #include <linux/stddef.h> 12c2d0b470SArd Biesheuvel 13c2d0b470SArd Biesheuvel #include <asm/efi.h> 14c2d0b470SArd Biesheuvel #include <asm/e820/types.h> 15c2d0b470SArd Biesheuvel #include <asm/setup.h> 16c2d0b470SArd Biesheuvel #include <asm/desc.h> 17c2d0b470SArd Biesheuvel #include <asm/boot.h> 18a1b87d54SArd Biesheuvel #include <asm/kaslr.h> 1931c77a50SArd Biesheuvel #include <asm/sev.h> 20c2d0b470SArd Biesheuvel 21c2d0b470SArd Biesheuvel #include "efistub.h" 22cb1c9e02SArd Biesheuvel #include "x86-stub.h" 23c2d0b470SArd Biesheuvel 24ae863aa1SArd Biesheuvel extern char _bss[], _ebss[]; 25ae863aa1SArd Biesheuvel 26ccc27ae7SArd Biesheuvel const efi_system_table_t *efi_system_table; 273ba75c13SBaskov Evgeniy const efi_dxe_services_table_t *efi_dxe_table; 28987053a3SArvind Sankar static efi_loaded_image_t *image = NULL; 2911078876SArd Biesheuvel static efi_memory_attribute_protocol_t *memattr; 30c2d0b470SArd Biesheuvel 31c0461bd1SDionna Glaze typedef union sev_memory_acceptance_protocol sev_memory_acceptance_protocol_t; 32c0461bd1SDionna Glaze union sev_memory_acceptance_protocol { 33c0461bd1SDionna Glaze struct { 34c0461bd1SDionna Glaze efi_status_t (__efiapi * allow_unaccepted_memory)( 35c0461bd1SDionna Glaze sev_memory_acceptance_protocol_t *); 36c0461bd1SDionna Glaze }; 37c0461bd1SDionna Glaze struct { 38c0461bd1SDionna Glaze u32 allow_unaccepted_memory; 39c0461bd1SDionna Glaze } mixed_mode; 40c0461bd1SDionna Glaze }; 41c0461bd1SDionna Glaze 42c2d0b470SArd Biesheuvel static efi_status_t 43c2d0b470SArd Biesheuvel preserve_pci_rom_image(efi_pci_io_protocol_t *pci, struct pci_setup_rom **__rom) 44c2d0b470SArd Biesheuvel { 45c2d0b470SArd Biesheuvel struct pci_setup_rom *rom = NULL; 46c2d0b470SArd Biesheuvel efi_status_t status; 47c2d0b470SArd Biesheuvel unsigned long size; 48c2d0b470SArd Biesheuvel uint64_t romsize; 49c2d0b470SArd Biesheuvel void *romimage; 50c2d0b470SArd Biesheuvel 51c2d0b470SArd Biesheuvel /* 52c2d0b470SArd Biesheuvel * Some firmware images contain EFI function pointers at the place where 53c2d0b470SArd Biesheuvel * the romimage and romsize fields are supposed to be. Typically the EFI 54c2d0b470SArd Biesheuvel * code is mapped at high addresses, translating to an unrealistically 55c2d0b470SArd Biesheuvel * large romsize. The UEFI spec limits the size of option ROMs to 16 56c2d0b470SArd Biesheuvel * MiB so we reject any ROMs over 16 MiB in size to catch this. 57c2d0b470SArd Biesheuvel */ 58c2d0b470SArd Biesheuvel romimage = efi_table_attr(pci, romimage); 59c2d0b470SArd Biesheuvel romsize = efi_table_attr(pci, romsize); 60c2d0b470SArd Biesheuvel if (!romimage || !romsize || romsize > SZ_16M) 61c2d0b470SArd Biesheuvel return EFI_INVALID_PARAMETER; 62c2d0b470SArd Biesheuvel 63c2d0b470SArd Biesheuvel size = romsize + sizeof(*rom); 64c2d0b470SArd Biesheuvel 65c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 66c2d0b470SArd Biesheuvel (void **)&rom); 67c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 6836bdd0a7SArvind Sankar efi_err("Failed to allocate memory for 'rom'\n"); 69c2d0b470SArd Biesheuvel return status; 70c2d0b470SArd Biesheuvel } 71c2d0b470SArd Biesheuvel 72c2d0b470SArd Biesheuvel memset(rom, 0, sizeof(*rom)); 73c2d0b470SArd Biesheuvel 74c2d0b470SArd Biesheuvel rom->data.type = SETUP_PCI; 75c2d0b470SArd Biesheuvel rom->data.len = size - sizeof(struct setup_data); 76c2d0b470SArd Biesheuvel rom->data.next = 0; 778b94da92SMikel Rychliski rom->pcilen = romsize; 78c2d0b470SArd Biesheuvel *__rom = rom; 79c2d0b470SArd Biesheuvel 80c2d0b470SArd Biesheuvel status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16, 81c2d0b470SArd Biesheuvel PCI_VENDOR_ID, 1, &rom->vendor); 82c2d0b470SArd Biesheuvel 83c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 8436bdd0a7SArvind Sankar efi_err("Failed to read rom->vendor\n"); 85c2d0b470SArd Biesheuvel goto free_struct; 86c2d0b470SArd Biesheuvel } 87c2d0b470SArd Biesheuvel 88c2d0b470SArd Biesheuvel status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16, 89c2d0b470SArd Biesheuvel PCI_DEVICE_ID, 1, &rom->devid); 90c2d0b470SArd Biesheuvel 91c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 9236bdd0a7SArvind Sankar efi_err("Failed to read rom->devid\n"); 93c2d0b470SArd Biesheuvel goto free_struct; 94c2d0b470SArd Biesheuvel } 95c2d0b470SArd Biesheuvel 96c2d0b470SArd Biesheuvel status = efi_call_proto(pci, get_location, &rom->segment, &rom->bus, 97c2d0b470SArd Biesheuvel &rom->device, &rom->function); 98c2d0b470SArd Biesheuvel 99c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 100c2d0b470SArd Biesheuvel goto free_struct; 101c2d0b470SArd Biesheuvel 102c2d0b470SArd Biesheuvel memcpy(rom->romdata, romimage, romsize); 103c2d0b470SArd Biesheuvel return status; 104c2d0b470SArd Biesheuvel 105c2d0b470SArd Biesheuvel free_struct: 106c2d0b470SArd Biesheuvel efi_bs_call(free_pool, rom); 107c2d0b470SArd Biesheuvel return status; 108c2d0b470SArd Biesheuvel } 109c2d0b470SArd Biesheuvel 110c2d0b470SArd Biesheuvel /* 111c2d0b470SArd Biesheuvel * There's no way to return an informative status from this function, 112c2d0b470SArd Biesheuvel * because any analysis (and printing of error messages) needs to be 113c2d0b470SArd Biesheuvel * done directly at the EFI function call-site. 114c2d0b470SArd Biesheuvel * 115c2d0b470SArd Biesheuvel * For example, EFI_INVALID_PARAMETER could indicate a bug or maybe we 116c2d0b470SArd Biesheuvel * just didn't find any PCI devices, but there's no way to tell outside 117c2d0b470SArd Biesheuvel * the context of the call. 118c2d0b470SArd Biesheuvel */ 119c2d0b470SArd Biesheuvel static void setup_efi_pci(struct boot_params *params) 120c2d0b470SArd Biesheuvel { 121c2d0b470SArd Biesheuvel efi_status_t status; 122c2d0b470SArd Biesheuvel void **pci_handle = NULL; 123c2d0b470SArd Biesheuvel efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID; 124c2d0b470SArd Biesheuvel unsigned long size = 0; 125c2d0b470SArd Biesheuvel struct setup_data *data; 126c2d0b470SArd Biesheuvel efi_handle_t h; 127c2d0b470SArd Biesheuvel int i; 128c2d0b470SArd Biesheuvel 129c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 130c2d0b470SArd Biesheuvel &pci_proto, NULL, &size, pci_handle); 131c2d0b470SArd Biesheuvel 132c2d0b470SArd Biesheuvel if (status == EFI_BUFFER_TOO_SMALL) { 133c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 134c2d0b470SArd Biesheuvel (void **)&pci_handle); 135c2d0b470SArd Biesheuvel 136c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 13736bdd0a7SArvind Sankar efi_err("Failed to allocate memory for 'pci_handle'\n"); 138c2d0b470SArd Biesheuvel return; 139c2d0b470SArd Biesheuvel } 140c2d0b470SArd Biesheuvel 141c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 142c2d0b470SArd Biesheuvel &pci_proto, NULL, &size, pci_handle); 143c2d0b470SArd Biesheuvel } 144c2d0b470SArd Biesheuvel 145c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 146c2d0b470SArd Biesheuvel goto free_handle; 147c2d0b470SArd Biesheuvel 148c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)params->hdr.setup_data; 149c2d0b470SArd Biesheuvel 150c2d0b470SArd Biesheuvel while (data && data->next) 151c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)data->next; 152c2d0b470SArd Biesheuvel 153c2d0b470SArd Biesheuvel for_each_efi_handle(h, pci_handle, size, i) { 154c2d0b470SArd Biesheuvel efi_pci_io_protocol_t *pci = NULL; 155c2d0b470SArd Biesheuvel struct pci_setup_rom *rom; 156c2d0b470SArd Biesheuvel 157c2d0b470SArd Biesheuvel status = efi_bs_call(handle_protocol, h, &pci_proto, 158c2d0b470SArd Biesheuvel (void **)&pci); 159c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS || !pci) 160c2d0b470SArd Biesheuvel continue; 161c2d0b470SArd Biesheuvel 162c2d0b470SArd Biesheuvel status = preserve_pci_rom_image(pci, &rom); 163c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 164c2d0b470SArd Biesheuvel continue; 165c2d0b470SArd Biesheuvel 166c2d0b470SArd Biesheuvel if (data) 167c2d0b470SArd Biesheuvel data->next = (unsigned long)rom; 168c2d0b470SArd Biesheuvel else 169c2d0b470SArd Biesheuvel params->hdr.setup_data = (unsigned long)rom; 170c2d0b470SArd Biesheuvel 171c2d0b470SArd Biesheuvel data = (struct setup_data *)rom; 172c2d0b470SArd Biesheuvel } 173c2d0b470SArd Biesheuvel 174c2d0b470SArd Biesheuvel free_handle: 175c2d0b470SArd Biesheuvel efi_bs_call(free_pool, pci_handle); 176c2d0b470SArd Biesheuvel } 177c2d0b470SArd Biesheuvel 178c2d0b470SArd Biesheuvel static void retrieve_apple_device_properties(struct boot_params *boot_params) 179c2d0b470SArd Biesheuvel { 180c2d0b470SArd Biesheuvel efi_guid_t guid = APPLE_PROPERTIES_PROTOCOL_GUID; 181c2d0b470SArd Biesheuvel struct setup_data *data, *new; 182c2d0b470SArd Biesheuvel efi_status_t status; 183c2d0b470SArd Biesheuvel u32 size = 0; 184c2d0b470SArd Biesheuvel apple_properties_protocol_t *p; 185c2d0b470SArd Biesheuvel 186c2d0b470SArd Biesheuvel status = efi_bs_call(locate_protocol, &guid, NULL, (void **)&p); 187c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 188c2d0b470SArd Biesheuvel return; 189c2d0b470SArd Biesheuvel 190c2d0b470SArd Biesheuvel if (efi_table_attr(p, version) != 0x10000) { 19136bdd0a7SArvind Sankar efi_err("Unsupported properties proto version\n"); 192c2d0b470SArd Biesheuvel return; 193c2d0b470SArd Biesheuvel } 194c2d0b470SArd Biesheuvel 195c2d0b470SArd Biesheuvel efi_call_proto(p, get_all, NULL, &size); 196c2d0b470SArd Biesheuvel if (!size) 197c2d0b470SArd Biesheuvel return; 198c2d0b470SArd Biesheuvel 199c2d0b470SArd Biesheuvel do { 200c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, 201c2d0b470SArd Biesheuvel size + sizeof(struct setup_data), 202c2d0b470SArd Biesheuvel (void **)&new); 203c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 20436bdd0a7SArvind Sankar efi_err("Failed to allocate memory for 'properties'\n"); 205c2d0b470SArd Biesheuvel return; 206c2d0b470SArd Biesheuvel } 207c2d0b470SArd Biesheuvel 208c2d0b470SArd Biesheuvel status = efi_call_proto(p, get_all, new->data, &size); 209c2d0b470SArd Biesheuvel 210c2d0b470SArd Biesheuvel if (status == EFI_BUFFER_TOO_SMALL) 211c2d0b470SArd Biesheuvel efi_bs_call(free_pool, new); 212c2d0b470SArd Biesheuvel } while (status == EFI_BUFFER_TOO_SMALL); 213c2d0b470SArd Biesheuvel 214c2d0b470SArd Biesheuvel new->type = SETUP_APPLE_PROPERTIES; 215c2d0b470SArd Biesheuvel new->len = size; 216c2d0b470SArd Biesheuvel new->next = 0; 217c2d0b470SArd Biesheuvel 218c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)boot_params->hdr.setup_data; 219c2d0b470SArd Biesheuvel if (!data) { 220c2d0b470SArd Biesheuvel boot_params->hdr.setup_data = (unsigned long)new; 221c2d0b470SArd Biesheuvel } else { 222c2d0b470SArd Biesheuvel while (data->next) 223c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)data->next; 224c2d0b470SArd Biesheuvel data->next = (unsigned long)new; 225c2d0b470SArd Biesheuvel } 226c2d0b470SArd Biesheuvel } 227c2d0b470SArd Biesheuvel 228c756fd5dSArd Biesheuvel efi_status_t efi_adjust_memory_range_protection(unsigned long start, 229cb1c9e02SArd Biesheuvel unsigned long size) 23082e0d6d7SBaskov Evgeniy { 23182e0d6d7SBaskov Evgeniy efi_status_t status; 23282e0d6d7SBaskov Evgeniy efi_gcd_memory_space_desc_t desc; 23382e0d6d7SBaskov Evgeniy unsigned long end, next; 23482e0d6d7SBaskov Evgeniy unsigned long rounded_start, rounded_end; 23582e0d6d7SBaskov Evgeniy unsigned long unprotect_start, unprotect_size; 23682e0d6d7SBaskov Evgeniy 23782e0d6d7SBaskov Evgeniy rounded_start = rounddown(start, EFI_PAGE_SIZE); 23882e0d6d7SBaskov Evgeniy rounded_end = roundup(start + size, EFI_PAGE_SIZE); 23982e0d6d7SBaskov Evgeniy 24011078876SArd Biesheuvel if (memattr != NULL) { 241c756fd5dSArd Biesheuvel status = efi_call_proto(memattr, clear_memory_attributes, 242c756fd5dSArd Biesheuvel rounded_start, 243c756fd5dSArd Biesheuvel rounded_end - rounded_start, 244c756fd5dSArd Biesheuvel EFI_MEMORY_XP); 245c756fd5dSArd Biesheuvel if (status != EFI_SUCCESS) 246c756fd5dSArd Biesheuvel efi_warn("Failed to clear EFI_MEMORY_XP attribute\n"); 247c756fd5dSArd Biesheuvel return status; 24811078876SArd Biesheuvel } 24911078876SArd Biesheuvel 25011078876SArd Biesheuvel if (efi_dxe_table == NULL) 251c756fd5dSArd Biesheuvel return EFI_SUCCESS; 25211078876SArd Biesheuvel 25382e0d6d7SBaskov Evgeniy /* 25482e0d6d7SBaskov Evgeniy * Don't modify memory region attributes, they are 25582e0d6d7SBaskov Evgeniy * already suitable, to lower the possibility to 25682e0d6d7SBaskov Evgeniy * encounter firmware bugs. 25782e0d6d7SBaskov Evgeniy */ 25882e0d6d7SBaskov Evgeniy 25982e0d6d7SBaskov Evgeniy for (end = start + size; start < end; start = next) { 26082e0d6d7SBaskov Evgeniy 26182e0d6d7SBaskov Evgeniy status = efi_dxe_call(get_memory_space_descriptor, start, &desc); 26282e0d6d7SBaskov Evgeniy 26382e0d6d7SBaskov Evgeniy if (status != EFI_SUCCESS) 264c756fd5dSArd Biesheuvel break; 26582e0d6d7SBaskov Evgeniy 26682e0d6d7SBaskov Evgeniy next = desc.base_address + desc.length; 26782e0d6d7SBaskov Evgeniy 26882e0d6d7SBaskov Evgeniy /* 26982e0d6d7SBaskov Evgeniy * Only system memory is suitable for trampoline/kernel image placement, 27082e0d6d7SBaskov Evgeniy * so only this type of memory needs its attributes to be modified. 27182e0d6d7SBaskov Evgeniy */ 27282e0d6d7SBaskov Evgeniy 27382e0d6d7SBaskov Evgeniy if (desc.gcd_memory_type != EfiGcdMemoryTypeSystemMemory || 27482e0d6d7SBaskov Evgeniy (desc.attributes & (EFI_MEMORY_RO | EFI_MEMORY_XP)) == 0) 27582e0d6d7SBaskov Evgeniy continue; 27682e0d6d7SBaskov Evgeniy 27782e0d6d7SBaskov Evgeniy unprotect_start = max(rounded_start, (unsigned long)desc.base_address); 27882e0d6d7SBaskov Evgeniy unprotect_size = min(rounded_end, next) - unprotect_start; 27982e0d6d7SBaskov Evgeniy 28082e0d6d7SBaskov Evgeniy status = efi_dxe_call(set_memory_space_attributes, 28182e0d6d7SBaskov Evgeniy unprotect_start, unprotect_size, 28282e0d6d7SBaskov Evgeniy EFI_MEMORY_WB); 28382e0d6d7SBaskov Evgeniy 28482e0d6d7SBaskov Evgeniy if (status != EFI_SUCCESS) { 28531f1a0edSArd Biesheuvel efi_warn("Unable to unprotect memory range [%08lx,%08lx]: %lx\n", 28682e0d6d7SBaskov Evgeniy unprotect_start, 28782e0d6d7SBaskov Evgeniy unprotect_start + unprotect_size, 28831f1a0edSArd Biesheuvel status); 289c756fd5dSArd Biesheuvel break; 29082e0d6d7SBaskov Evgeniy } 29182e0d6d7SBaskov Evgeniy } 292c756fd5dSArd Biesheuvel return EFI_SUCCESS; 29382e0d6d7SBaskov Evgeniy } 29482e0d6d7SBaskov Evgeniy 295c0461bd1SDionna Glaze static void setup_unaccepted_memory(void) 296c0461bd1SDionna Glaze { 297c0461bd1SDionna Glaze efi_guid_t mem_acceptance_proto = OVMF_SEV_MEMORY_ACCEPTANCE_PROTOCOL_GUID; 298c0461bd1SDionna Glaze sev_memory_acceptance_protocol_t *proto; 299c0461bd1SDionna Glaze efi_status_t status; 300c0461bd1SDionna Glaze 301c0461bd1SDionna Glaze if (!IS_ENABLED(CONFIG_UNACCEPTED_MEMORY)) 302c0461bd1SDionna Glaze return; 303c0461bd1SDionna Glaze 304c0461bd1SDionna Glaze /* 305c0461bd1SDionna Glaze * Enable unaccepted memory before calling exit boot services in order 306c0461bd1SDionna Glaze * for the UEFI to not accept all memory on EBS. 307c0461bd1SDionna Glaze */ 308c0461bd1SDionna Glaze status = efi_bs_call(locate_protocol, &mem_acceptance_proto, NULL, 309c0461bd1SDionna Glaze (void **)&proto); 310c0461bd1SDionna Glaze if (status != EFI_SUCCESS) 311c0461bd1SDionna Glaze return; 312c0461bd1SDionna Glaze 313c0461bd1SDionna Glaze status = efi_call_proto(proto, allow_unaccepted_memory); 314c0461bd1SDionna Glaze if (status != EFI_SUCCESS) 315c0461bd1SDionna Glaze efi_err("Memory acceptance protocol failed\n"); 316c0461bd1SDionna Glaze } 317c0461bd1SDionna Glaze 318800f84d8SArd Biesheuvel static efi_char16_t *efistub_fw_vendor(void) 319800f84d8SArd Biesheuvel { 320800f84d8SArd Biesheuvel unsigned long vendor = efi_table_attr(efi_system_table, fw_vendor); 321800f84d8SArd Biesheuvel 322800f84d8SArd Biesheuvel return (efi_char16_t *)vendor; 323800f84d8SArd Biesheuvel } 324800f84d8SArd Biesheuvel 325c2d0b470SArd Biesheuvel static const efi_char16_t apple[] = L"Apple"; 326c2d0b470SArd Biesheuvel 327a1b87d54SArd Biesheuvel static void setup_quirks(struct boot_params *boot_params) 328c2d0b470SArd Biesheuvel { 329800f84d8SArd Biesheuvel if (IS_ENABLED(CONFIG_APPLE_PROPERTIES) && 330800f84d8SArd Biesheuvel !memcmp(efistub_fw_vendor(), apple, sizeof(apple))) 331c2d0b470SArd Biesheuvel retrieve_apple_device_properties(boot_params); 332c2d0b470SArd Biesheuvel } 333c2d0b470SArd Biesheuvel 334c2d0b470SArd Biesheuvel /* 335c2d0b470SArd Biesheuvel * See if we have Universal Graphics Adapter (UGA) protocol 336c2d0b470SArd Biesheuvel */ 337c2d0b470SArd Biesheuvel static efi_status_t 338c2d0b470SArd Biesheuvel setup_uga(struct screen_info *si, efi_guid_t *uga_proto, unsigned long size) 339c2d0b470SArd Biesheuvel { 340c2d0b470SArd Biesheuvel efi_status_t status; 341c2d0b470SArd Biesheuvel u32 width, height; 342c2d0b470SArd Biesheuvel void **uga_handle = NULL; 343c2d0b470SArd Biesheuvel efi_uga_draw_protocol_t *uga = NULL, *first_uga; 344c2d0b470SArd Biesheuvel efi_handle_t handle; 345c2d0b470SArd Biesheuvel int i; 346c2d0b470SArd Biesheuvel 347c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 348c2d0b470SArd Biesheuvel (void **)&uga_handle); 349c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 350c2d0b470SArd Biesheuvel return status; 351c2d0b470SArd Biesheuvel 352c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 353c2d0b470SArd Biesheuvel uga_proto, NULL, &size, uga_handle); 354c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 355c2d0b470SArd Biesheuvel goto free_handle; 356c2d0b470SArd Biesheuvel 357c2d0b470SArd Biesheuvel height = 0; 358c2d0b470SArd Biesheuvel width = 0; 359c2d0b470SArd Biesheuvel 360c2d0b470SArd Biesheuvel first_uga = NULL; 361c2d0b470SArd Biesheuvel for_each_efi_handle(handle, uga_handle, size, i) { 362c2d0b470SArd Biesheuvel efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID; 363c2d0b470SArd Biesheuvel u32 w, h, depth, refresh; 364c2d0b470SArd Biesheuvel void *pciio; 365c2d0b470SArd Biesheuvel 366c2d0b470SArd Biesheuvel status = efi_bs_call(handle_protocol, handle, uga_proto, 367c2d0b470SArd Biesheuvel (void **)&uga); 368c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 369c2d0b470SArd Biesheuvel continue; 370c2d0b470SArd Biesheuvel 371c2d0b470SArd Biesheuvel pciio = NULL; 372c2d0b470SArd Biesheuvel efi_bs_call(handle_protocol, handle, &pciio_proto, &pciio); 373c2d0b470SArd Biesheuvel 374c2d0b470SArd Biesheuvel status = efi_call_proto(uga, get_mode, &w, &h, &depth, &refresh); 375c2d0b470SArd Biesheuvel if (status == EFI_SUCCESS && (!first_uga || pciio)) { 376c2d0b470SArd Biesheuvel width = w; 377c2d0b470SArd Biesheuvel height = h; 378c2d0b470SArd Biesheuvel 379c2d0b470SArd Biesheuvel /* 380c2d0b470SArd Biesheuvel * Once we've found a UGA supporting PCIIO, 381c2d0b470SArd Biesheuvel * don't bother looking any further. 382c2d0b470SArd Biesheuvel */ 383c2d0b470SArd Biesheuvel if (pciio) 384c2d0b470SArd Biesheuvel break; 385c2d0b470SArd Biesheuvel 386c2d0b470SArd Biesheuvel first_uga = uga; 387c2d0b470SArd Biesheuvel } 388c2d0b470SArd Biesheuvel } 389c2d0b470SArd Biesheuvel 390c2d0b470SArd Biesheuvel if (!width && !height) 391c2d0b470SArd Biesheuvel goto free_handle; 392c2d0b470SArd Biesheuvel 393c2d0b470SArd Biesheuvel /* EFI framebuffer */ 394c2d0b470SArd Biesheuvel si->orig_video_isVGA = VIDEO_TYPE_EFI; 395c2d0b470SArd Biesheuvel 396c2d0b470SArd Biesheuvel si->lfb_depth = 32; 397c2d0b470SArd Biesheuvel si->lfb_width = width; 398c2d0b470SArd Biesheuvel si->lfb_height = height; 399c2d0b470SArd Biesheuvel 400c2d0b470SArd Biesheuvel si->red_size = 8; 401c2d0b470SArd Biesheuvel si->red_pos = 16; 402c2d0b470SArd Biesheuvel si->green_size = 8; 403c2d0b470SArd Biesheuvel si->green_pos = 8; 404c2d0b470SArd Biesheuvel si->blue_size = 8; 405c2d0b470SArd Biesheuvel si->blue_pos = 0; 406c2d0b470SArd Biesheuvel si->rsvd_size = 8; 407c2d0b470SArd Biesheuvel si->rsvd_pos = 24; 408c2d0b470SArd Biesheuvel 409c2d0b470SArd Biesheuvel free_handle: 410c2d0b470SArd Biesheuvel efi_bs_call(free_pool, uga_handle); 411c2d0b470SArd Biesheuvel 412c2d0b470SArd Biesheuvel return status; 413c2d0b470SArd Biesheuvel } 414c2d0b470SArd Biesheuvel 415c2d0b470SArd Biesheuvel static void setup_graphics(struct boot_params *boot_params) 416c2d0b470SArd Biesheuvel { 417c2d0b470SArd Biesheuvel efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID; 418c2d0b470SArd Biesheuvel struct screen_info *si; 419c2d0b470SArd Biesheuvel efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID; 420c2d0b470SArd Biesheuvel efi_status_t status; 421c2d0b470SArd Biesheuvel unsigned long size; 422c2d0b470SArd Biesheuvel void **gop_handle = NULL; 423c2d0b470SArd Biesheuvel void **uga_handle = NULL; 424c2d0b470SArd Biesheuvel 425c2d0b470SArd Biesheuvel si = &boot_params->screen_info; 426c2d0b470SArd Biesheuvel memset(si, 0, sizeof(*si)); 427c2d0b470SArd Biesheuvel 428c2d0b470SArd Biesheuvel size = 0; 429c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 430c2d0b470SArd Biesheuvel &graphics_proto, NULL, &size, gop_handle); 431c2d0b470SArd Biesheuvel if (status == EFI_BUFFER_TOO_SMALL) 432c2d0b470SArd Biesheuvel status = efi_setup_gop(si, &graphics_proto, size); 433c2d0b470SArd Biesheuvel 434c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 435c2d0b470SArd Biesheuvel size = 0; 436c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 437c2d0b470SArd Biesheuvel &uga_proto, NULL, &size, uga_handle); 438c2d0b470SArd Biesheuvel if (status == EFI_BUFFER_TOO_SMALL) 439c2d0b470SArd Biesheuvel setup_uga(si, &uga_proto, size); 440c2d0b470SArd Biesheuvel } 441c2d0b470SArd Biesheuvel } 442c2d0b470SArd Biesheuvel 4433b8f44fcSArd Biesheuvel 4443b8f44fcSArd Biesheuvel static void __noreturn efi_exit(efi_handle_t handle, efi_status_t status) 4453b8f44fcSArd Biesheuvel { 4463b8f44fcSArd Biesheuvel efi_bs_call(exit, handle, status, 0, NULL); 447f3fa0efcSArd Biesheuvel for(;;) 448f3fa0efcSArd Biesheuvel asm("hlt"); 4493b8f44fcSArd Biesheuvel } 4503b8f44fcSArd Biesheuvel 451c2d0b470SArd Biesheuvel void __noreturn efi_stub_entry(efi_handle_t handle, 452c2d0b470SArd Biesheuvel efi_system_table_t *sys_table_arg, 453c2d0b470SArd Biesheuvel struct boot_params *boot_params); 454c2d0b470SArd Biesheuvel 455c2d0b470SArd Biesheuvel /* 456c2d0b470SArd Biesheuvel * Because the x86 boot code expects to be passed a boot_params we 457c2d0b470SArd Biesheuvel * need to create one ourselves (usually the bootloader would create 458c2d0b470SArd Biesheuvel * one for us). 459c2d0b470SArd Biesheuvel */ 460c2d0b470SArd Biesheuvel efi_status_t __efiapi efi_pe_entry(efi_handle_t handle, 461c2d0b470SArd Biesheuvel efi_system_table_t *sys_table_arg) 462c2d0b470SArd Biesheuvel { 4638117961dSArd Biesheuvel static struct boot_params boot_params __page_aligned_bss; 4648117961dSArd Biesheuvel struct setup_header *hdr = &boot_params.hdr; 465c2d0b470SArd Biesheuvel efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID; 466c2d0b470SArd Biesheuvel int options_size = 0; 467c2d0b470SArd Biesheuvel efi_status_t status; 468c2d0b470SArd Biesheuvel char *cmdline_ptr; 469c2d0b470SArd Biesheuvel 4705ad5dcfdSArd Biesheuvel if (efi_is_native()) 471ae863aa1SArd Biesheuvel memset(_bss, 0, _ebss - _bss); 472ae863aa1SArd Biesheuvel 473ccc27ae7SArd Biesheuvel efi_system_table = sys_table_arg; 474c2d0b470SArd Biesheuvel 475c2d0b470SArd Biesheuvel /* Check if we were booted by the EFI firmware */ 476ccc27ae7SArd Biesheuvel if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) 4773b8f44fcSArd Biesheuvel efi_exit(handle, EFI_INVALID_PARAMETER); 478c2d0b470SArd Biesheuvel 4790347d8c2SArvind Sankar status = efi_bs_call(handle_protocol, handle, &proto, (void **)&image); 480c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 48136bdd0a7SArvind Sankar efi_err("Failed to get handle for LOADED_IMAGE_PROTOCOL\n"); 4823b8f44fcSArd Biesheuvel efi_exit(handle, status); 483c2d0b470SArd Biesheuvel } 484c2d0b470SArd Biesheuvel 4858117961dSArd Biesheuvel /* Assign the setup_header fields that the kernel actually cares about */ 486c2d0b470SArd Biesheuvel hdr->root_flags = 1; 487c2d0b470SArd Biesheuvel hdr->vid_mode = 0xffff; 488c2d0b470SArd Biesheuvel 489c2d0b470SArd Biesheuvel hdr->type_of_loader = 0x21; 490*5110da79SArd Biesheuvel hdr->initrd_addr_max = INT_MAX; 491c2d0b470SArd Biesheuvel 492c2d0b470SArd Biesheuvel /* Convert unicode cmdline to ascii */ 49327cd5511SArd Biesheuvel cmdline_ptr = efi_convert_cmdline(image, &options_size); 494c2d0b470SArd Biesheuvel if (!cmdline_ptr) 495c2d0b470SArd Biesheuvel goto fail; 496c2d0b470SArd Biesheuvel 4978117961dSArd Biesheuvel efi_set_u64_split((unsigned long)cmdline_ptr, &hdr->cmd_line_ptr, 4988117961dSArd Biesheuvel &boot_params.ext_cmd_line_ptr); 499c2d0b470SArd Biesheuvel 5008117961dSArd Biesheuvel efi_stub_entry(handle, sys_table_arg, &boot_params); 501c2d0b470SArd Biesheuvel /* not reached */ 502c2d0b470SArd Biesheuvel 503c2d0b470SArd Biesheuvel fail: 5043b8f44fcSArd Biesheuvel efi_exit(handle, status); 505c2d0b470SArd Biesheuvel } 506c2d0b470SArd Biesheuvel 507c2d0b470SArd Biesheuvel static void add_e820ext(struct boot_params *params, 508c2d0b470SArd Biesheuvel struct setup_data *e820ext, u32 nr_entries) 509c2d0b470SArd Biesheuvel { 510c2d0b470SArd Biesheuvel struct setup_data *data; 511c2d0b470SArd Biesheuvel 512c2d0b470SArd Biesheuvel e820ext->type = SETUP_E820_EXT; 513c2d0b470SArd Biesheuvel e820ext->len = nr_entries * sizeof(struct boot_e820_entry); 514c2d0b470SArd Biesheuvel e820ext->next = 0; 515c2d0b470SArd Biesheuvel 516c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)params->hdr.setup_data; 517c2d0b470SArd Biesheuvel 518c2d0b470SArd Biesheuvel while (data && data->next) 519c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)data->next; 520c2d0b470SArd Biesheuvel 521c2d0b470SArd Biesheuvel if (data) 522c2d0b470SArd Biesheuvel data->next = (unsigned long)e820ext; 523c2d0b470SArd Biesheuvel else 524c2d0b470SArd Biesheuvel params->hdr.setup_data = (unsigned long)e820ext; 525c2d0b470SArd Biesheuvel } 526c2d0b470SArd Biesheuvel 527c2d0b470SArd Biesheuvel static efi_status_t 528c2d0b470SArd Biesheuvel setup_e820(struct boot_params *params, struct setup_data *e820ext, u32 e820ext_size) 529c2d0b470SArd Biesheuvel { 530c2d0b470SArd Biesheuvel struct boot_e820_entry *entry = params->e820_table; 531c2d0b470SArd Biesheuvel struct efi_info *efi = ¶ms->efi_info; 532c2d0b470SArd Biesheuvel struct boot_e820_entry *prev = NULL; 533c2d0b470SArd Biesheuvel u32 nr_entries; 534c2d0b470SArd Biesheuvel u32 nr_desc; 535c2d0b470SArd Biesheuvel int i; 536c2d0b470SArd Biesheuvel 537c2d0b470SArd Biesheuvel nr_entries = 0; 538c2d0b470SArd Biesheuvel nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size; 539c2d0b470SArd Biesheuvel 540c2d0b470SArd Biesheuvel for (i = 0; i < nr_desc; i++) { 541c2d0b470SArd Biesheuvel efi_memory_desc_t *d; 542c2d0b470SArd Biesheuvel unsigned int e820_type = 0; 543c2d0b470SArd Biesheuvel unsigned long m = efi->efi_memmap; 544c2d0b470SArd Biesheuvel 545c2d0b470SArd Biesheuvel #ifdef CONFIG_X86_64 546c2d0b470SArd Biesheuvel m |= (u64)efi->efi_memmap_hi << 32; 547c2d0b470SArd Biesheuvel #endif 548c2d0b470SArd Biesheuvel 549c2d0b470SArd Biesheuvel d = efi_early_memdesc_ptr(m, efi->efi_memdesc_size, i); 550c2d0b470SArd Biesheuvel switch (d->type) { 551c2d0b470SArd Biesheuvel case EFI_RESERVED_TYPE: 552c2d0b470SArd Biesheuvel case EFI_RUNTIME_SERVICES_CODE: 553c2d0b470SArd Biesheuvel case EFI_RUNTIME_SERVICES_DATA: 554c2d0b470SArd Biesheuvel case EFI_MEMORY_MAPPED_IO: 555c2d0b470SArd Biesheuvel case EFI_MEMORY_MAPPED_IO_PORT_SPACE: 556c2d0b470SArd Biesheuvel case EFI_PAL_CODE: 557c2d0b470SArd Biesheuvel e820_type = E820_TYPE_RESERVED; 558c2d0b470SArd Biesheuvel break; 559c2d0b470SArd Biesheuvel 560c2d0b470SArd Biesheuvel case EFI_UNUSABLE_MEMORY: 561c2d0b470SArd Biesheuvel e820_type = E820_TYPE_UNUSABLE; 562c2d0b470SArd Biesheuvel break; 563c2d0b470SArd Biesheuvel 564c2d0b470SArd Biesheuvel case EFI_ACPI_RECLAIM_MEMORY: 565c2d0b470SArd Biesheuvel e820_type = E820_TYPE_ACPI; 566c2d0b470SArd Biesheuvel break; 567c2d0b470SArd Biesheuvel 568c2d0b470SArd Biesheuvel case EFI_LOADER_CODE: 569c2d0b470SArd Biesheuvel case EFI_LOADER_DATA: 570c2d0b470SArd Biesheuvel case EFI_BOOT_SERVICES_CODE: 571c2d0b470SArd Biesheuvel case EFI_BOOT_SERVICES_DATA: 572c2d0b470SArd Biesheuvel case EFI_CONVENTIONAL_MEMORY: 573c2d0b470SArd Biesheuvel if (efi_soft_reserve_enabled() && 574c2d0b470SArd Biesheuvel (d->attribute & EFI_MEMORY_SP)) 575c2d0b470SArd Biesheuvel e820_type = E820_TYPE_SOFT_RESERVED; 576c2d0b470SArd Biesheuvel else 577c2d0b470SArd Biesheuvel e820_type = E820_TYPE_RAM; 578c2d0b470SArd Biesheuvel break; 579c2d0b470SArd Biesheuvel 580c2d0b470SArd Biesheuvel case EFI_ACPI_MEMORY_NVS: 581c2d0b470SArd Biesheuvel e820_type = E820_TYPE_NVS; 582c2d0b470SArd Biesheuvel break; 583c2d0b470SArd Biesheuvel 584c2d0b470SArd Biesheuvel case EFI_PERSISTENT_MEMORY: 585c2d0b470SArd Biesheuvel e820_type = E820_TYPE_PMEM; 586c2d0b470SArd Biesheuvel break; 587c2d0b470SArd Biesheuvel 588745e3ed8SKirill A. Shutemov case EFI_UNACCEPTED_MEMORY: 589ff07186bSNikolay Borisov if (!IS_ENABLED(CONFIG_UNACCEPTED_MEMORY)) 590745e3ed8SKirill A. Shutemov continue; 591745e3ed8SKirill A. Shutemov e820_type = E820_TYPE_RAM; 592745e3ed8SKirill A. Shutemov process_unaccepted_memory(d->phys_addr, 593745e3ed8SKirill A. Shutemov d->phys_addr + PAGE_SIZE * d->num_pages); 594745e3ed8SKirill A. Shutemov break; 595c2d0b470SArd Biesheuvel default: 596c2d0b470SArd Biesheuvel continue; 597c2d0b470SArd Biesheuvel } 598c2d0b470SArd Biesheuvel 599c2d0b470SArd Biesheuvel /* Merge adjacent mappings */ 600c2d0b470SArd Biesheuvel if (prev && prev->type == e820_type && 601c2d0b470SArd Biesheuvel (prev->addr + prev->size) == d->phys_addr) { 602c2d0b470SArd Biesheuvel prev->size += d->num_pages << 12; 603c2d0b470SArd Biesheuvel continue; 604c2d0b470SArd Biesheuvel } 605c2d0b470SArd Biesheuvel 606c2d0b470SArd Biesheuvel if (nr_entries == ARRAY_SIZE(params->e820_table)) { 607c2d0b470SArd Biesheuvel u32 need = (nr_desc - i) * sizeof(struct e820_entry) + 608c2d0b470SArd Biesheuvel sizeof(struct setup_data); 609c2d0b470SArd Biesheuvel 610c2d0b470SArd Biesheuvel if (!e820ext || e820ext_size < need) 611c2d0b470SArd Biesheuvel return EFI_BUFFER_TOO_SMALL; 612c2d0b470SArd Biesheuvel 613c2d0b470SArd Biesheuvel /* boot_params map full, switch to e820 extended */ 614c2d0b470SArd Biesheuvel entry = (struct boot_e820_entry *)e820ext->data; 615c2d0b470SArd Biesheuvel } 616c2d0b470SArd Biesheuvel 617c2d0b470SArd Biesheuvel entry->addr = d->phys_addr; 618c2d0b470SArd Biesheuvel entry->size = d->num_pages << PAGE_SHIFT; 619c2d0b470SArd Biesheuvel entry->type = e820_type; 620c2d0b470SArd Biesheuvel prev = entry++; 621c2d0b470SArd Biesheuvel nr_entries++; 622c2d0b470SArd Biesheuvel } 623c2d0b470SArd Biesheuvel 624c2d0b470SArd Biesheuvel if (nr_entries > ARRAY_SIZE(params->e820_table)) { 625c2d0b470SArd Biesheuvel u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_table); 626c2d0b470SArd Biesheuvel 627c2d0b470SArd Biesheuvel add_e820ext(params, e820ext, nr_e820ext); 628c2d0b470SArd Biesheuvel nr_entries -= nr_e820ext; 629c2d0b470SArd Biesheuvel } 630c2d0b470SArd Biesheuvel 631c2d0b470SArd Biesheuvel params->e820_entries = (u8)nr_entries; 632c2d0b470SArd Biesheuvel 633c2d0b470SArd Biesheuvel return EFI_SUCCESS; 634c2d0b470SArd Biesheuvel } 635c2d0b470SArd Biesheuvel 636c2d0b470SArd Biesheuvel static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext, 637c2d0b470SArd Biesheuvel u32 *e820ext_size) 638c2d0b470SArd Biesheuvel { 639c2d0b470SArd Biesheuvel efi_status_t status; 640c2d0b470SArd Biesheuvel unsigned long size; 641c2d0b470SArd Biesheuvel 642c2d0b470SArd Biesheuvel size = sizeof(struct setup_data) + 643c2d0b470SArd Biesheuvel sizeof(struct e820_entry) * nr_desc; 644c2d0b470SArd Biesheuvel 645c2d0b470SArd Biesheuvel if (*e820ext) { 646c2d0b470SArd Biesheuvel efi_bs_call(free_pool, *e820ext); 647c2d0b470SArd Biesheuvel *e820ext = NULL; 648c2d0b470SArd Biesheuvel *e820ext_size = 0; 649c2d0b470SArd Biesheuvel } 650c2d0b470SArd Biesheuvel 651c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 652c2d0b470SArd Biesheuvel (void **)e820ext); 653c2d0b470SArd Biesheuvel if (status == EFI_SUCCESS) 654c2d0b470SArd Biesheuvel *e820ext_size = size; 655c2d0b470SArd Biesheuvel 656c2d0b470SArd Biesheuvel return status; 657c2d0b470SArd Biesheuvel } 658c2d0b470SArd Biesheuvel 659c2d0b470SArd Biesheuvel static efi_status_t allocate_e820(struct boot_params *params, 660c2d0b470SArd Biesheuvel struct setup_data **e820ext, 661c2d0b470SArd Biesheuvel u32 *e820ext_size) 662c2d0b470SArd Biesheuvel { 6632e9f46eeSKirill A. Shutemov struct efi_boot_memmap *map; 664c2d0b470SArd Biesheuvel efi_status_t status; 6652e9f46eeSKirill A. Shutemov __u32 nr_desc; 666c2d0b470SArd Biesheuvel 6672e9f46eeSKirill A. Shutemov status = efi_get_memory_map(&map, false); 668c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 669c2d0b470SArd Biesheuvel return status; 6702e9f46eeSKirill A. Shutemov 6712e9f46eeSKirill A. Shutemov nr_desc = map->map_size / map->desc_size; 6722e9f46eeSKirill A. Shutemov if (nr_desc > ARRAY_SIZE(params->e820_table) - EFI_MMAP_NR_SLACK_SLOTS) { 6732e9f46eeSKirill A. Shutemov u32 nr_e820ext = nr_desc - ARRAY_SIZE(params->e820_table) + 6742e9f46eeSKirill A. Shutemov EFI_MMAP_NR_SLACK_SLOTS; 6752e9f46eeSKirill A. Shutemov 6762e9f46eeSKirill A. Shutemov status = alloc_e820ext(nr_e820ext, e820ext, e820ext_size); 677c2d0b470SArd Biesheuvel } 678c2d0b470SArd Biesheuvel 679745e3ed8SKirill A. Shutemov if (IS_ENABLED(CONFIG_UNACCEPTED_MEMORY) && status == EFI_SUCCESS) 680745e3ed8SKirill A. Shutemov status = allocate_unaccepted_bitmap(nr_desc, map); 681745e3ed8SKirill A. Shutemov 6822e9f46eeSKirill A. Shutemov efi_bs_call(free_pool, map); 6832e9f46eeSKirill A. Shutemov return status; 684c2d0b470SArd Biesheuvel } 685c2d0b470SArd Biesheuvel 686c2d0b470SArd Biesheuvel struct exit_boot_struct { 687c2d0b470SArd Biesheuvel struct boot_params *boot_params; 688c2d0b470SArd Biesheuvel struct efi_info *efi; 689c2d0b470SArd Biesheuvel }; 690c2d0b470SArd Biesheuvel 691c2d0b470SArd Biesheuvel static efi_status_t exit_boot_func(struct efi_boot_memmap *map, 692c2d0b470SArd Biesheuvel void *priv) 693c2d0b470SArd Biesheuvel { 694c2d0b470SArd Biesheuvel const char *signature; 695c2d0b470SArd Biesheuvel struct exit_boot_struct *p = priv; 696c2d0b470SArd Biesheuvel 697c2d0b470SArd Biesheuvel signature = efi_is_64bit() ? EFI64_LOADER_SIGNATURE 698c2d0b470SArd Biesheuvel : EFI32_LOADER_SIGNATURE; 699c2d0b470SArd Biesheuvel memcpy(&p->efi->efi_loader_signature, signature, sizeof(__u32)); 700c2d0b470SArd Biesheuvel 701eed4e019SArvind Sankar efi_set_u64_split((unsigned long)efi_system_table, 702eed4e019SArvind Sankar &p->efi->efi_systab, &p->efi->efi_systab_hi); 703eab31265SArd Biesheuvel p->efi->efi_memdesc_size = map->desc_size; 704eab31265SArd Biesheuvel p->efi->efi_memdesc_version = map->desc_ver; 705eab31265SArd Biesheuvel efi_set_u64_split((unsigned long)map->map, 706eed4e019SArvind Sankar &p->efi->efi_memmap, &p->efi->efi_memmap_hi); 707eab31265SArd Biesheuvel p->efi->efi_memmap_size = map->map_size; 708c2d0b470SArd Biesheuvel 709c2d0b470SArd Biesheuvel return EFI_SUCCESS; 710c2d0b470SArd Biesheuvel } 711c2d0b470SArd Biesheuvel 712c2d0b470SArd Biesheuvel static efi_status_t exit_boot(struct boot_params *boot_params, void *handle) 713c2d0b470SArd Biesheuvel { 714c2d0b470SArd Biesheuvel struct setup_data *e820ext = NULL; 715c2d0b470SArd Biesheuvel __u32 e820ext_size = 0; 716c2d0b470SArd Biesheuvel efi_status_t status; 717c2d0b470SArd Biesheuvel struct exit_boot_struct priv; 718c2d0b470SArd Biesheuvel 719c2d0b470SArd Biesheuvel priv.boot_params = boot_params; 720c2d0b470SArd Biesheuvel priv.efi = &boot_params->efi_info; 721c2d0b470SArd Biesheuvel 722c2d0b470SArd Biesheuvel status = allocate_e820(boot_params, &e820ext, &e820ext_size); 723c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 724c2d0b470SArd Biesheuvel return status; 725c2d0b470SArd Biesheuvel 726c2d0b470SArd Biesheuvel /* Might as well exit boot services now */ 727eab31265SArd Biesheuvel status = efi_exit_boot_services(handle, &priv, exit_boot_func); 728c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 729c2d0b470SArd Biesheuvel return status; 730c2d0b470SArd Biesheuvel 731c2d0b470SArd Biesheuvel /* Historic? */ 732c2d0b470SArd Biesheuvel boot_params->alt_mem_k = 32 * 1024; 733c2d0b470SArd Biesheuvel 734c2d0b470SArd Biesheuvel status = setup_e820(boot_params, e820ext, e820ext_size); 735c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 736c2d0b470SArd Biesheuvel return status; 737c2d0b470SArd Biesheuvel 738c2d0b470SArd Biesheuvel return EFI_SUCCESS; 739c2d0b470SArd Biesheuvel } 740c2d0b470SArd Biesheuvel 74131c77a50SArd Biesheuvel static bool have_unsupported_snp_features(void) 74231c77a50SArd Biesheuvel { 74331c77a50SArd Biesheuvel u64 unsupported; 74431c77a50SArd Biesheuvel 74531c77a50SArd Biesheuvel unsupported = snp_get_unsupported_features(sev_get_status()); 74631c77a50SArd Biesheuvel if (unsupported) { 74731c77a50SArd Biesheuvel efi_err("Unsupported SEV-SNP features detected: 0x%llx\n", 74831c77a50SArd Biesheuvel unsupported); 74931c77a50SArd Biesheuvel return true; 75031c77a50SArd Biesheuvel } 75131c77a50SArd Biesheuvel return false; 75231c77a50SArd Biesheuvel } 75331c77a50SArd Biesheuvel 754a1b87d54SArd Biesheuvel static void efi_get_seed(void *seed, int size) 755a1b87d54SArd Biesheuvel { 756a1b87d54SArd Biesheuvel efi_get_random_bytes(size, seed); 757a1b87d54SArd Biesheuvel 758a1b87d54SArd Biesheuvel /* 759a1b87d54SArd Biesheuvel * This only updates seed[0] when running on 32-bit, but in that case, 760a1b87d54SArd Biesheuvel * seed[1] is not used anyway, as there is no virtual KASLR on 32-bit. 761a1b87d54SArd Biesheuvel */ 762a1b87d54SArd Biesheuvel *(unsigned long *)seed ^= kaslr_get_random_long("EFI"); 763a1b87d54SArd Biesheuvel } 764a1b87d54SArd Biesheuvel 765a1b87d54SArd Biesheuvel static void error(char *str) 766a1b87d54SArd Biesheuvel { 767a1b87d54SArd Biesheuvel efi_warn("Decompression failed: %s\n", str); 768a1b87d54SArd Biesheuvel } 769a1b87d54SArd Biesheuvel 770a1b87d54SArd Biesheuvel static efi_status_t efi_decompress_kernel(unsigned long *kernel_entry) 771a1b87d54SArd Biesheuvel { 772a1b87d54SArd Biesheuvel unsigned long virt_addr = LOAD_PHYSICAL_ADDR; 773a1b87d54SArd Biesheuvel unsigned long addr, alloc_size, entry; 774a1b87d54SArd Biesheuvel efi_status_t status; 775a1b87d54SArd Biesheuvel u32 seed[2] = {}; 776a1b87d54SArd Biesheuvel 777a1b87d54SArd Biesheuvel /* determine the required size of the allocation */ 778a1b87d54SArd Biesheuvel alloc_size = ALIGN(max_t(unsigned long, output_len, kernel_total_size), 779a1b87d54SArd Biesheuvel MIN_KERNEL_ALIGN); 780a1b87d54SArd Biesheuvel 781a1b87d54SArd Biesheuvel if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && !efi_nokaslr) { 782a1b87d54SArd Biesheuvel u64 range = KERNEL_IMAGE_SIZE - LOAD_PHYSICAL_ADDR - kernel_total_size; 783800f84d8SArd Biesheuvel static const efi_char16_t ami[] = L"American Megatrends"; 784a1b87d54SArd Biesheuvel 785a1b87d54SArd Biesheuvel efi_get_seed(seed, sizeof(seed)); 786a1b87d54SArd Biesheuvel 787a1b87d54SArd Biesheuvel virt_addr += (range * seed[1]) >> 32; 788a1b87d54SArd Biesheuvel virt_addr &= ~(CONFIG_PHYSICAL_ALIGN - 1); 789800f84d8SArd Biesheuvel 790800f84d8SArd Biesheuvel /* 791800f84d8SArd Biesheuvel * Older Dell systems with AMI UEFI firmware v2.0 may hang 792800f84d8SArd Biesheuvel * while decompressing the kernel if physical address 793800f84d8SArd Biesheuvel * randomization is enabled. 794800f84d8SArd Biesheuvel * 795800f84d8SArd Biesheuvel * https://bugzilla.kernel.org/show_bug.cgi?id=218173 796800f84d8SArd Biesheuvel */ 797800f84d8SArd Biesheuvel if (efi_system_table->hdr.revision <= EFI_2_00_SYSTEM_TABLE_REVISION && 798800f84d8SArd Biesheuvel !memcmp(efistub_fw_vendor(), ami, sizeof(ami))) { 799800f84d8SArd Biesheuvel efi_debug("AMI firmware v2.0 or older detected - disabling physical KASLR\n"); 800800f84d8SArd Biesheuvel seed[0] = 0; 801800f84d8SArd Biesheuvel } 802a1b87d54SArd Biesheuvel } 803a1b87d54SArd Biesheuvel 804a1b87d54SArd Biesheuvel status = efi_random_alloc(alloc_size, CONFIG_PHYSICAL_ALIGN, &addr, 805a1b87d54SArd Biesheuvel seed[0], EFI_LOADER_CODE, 8060e7ca435SArd Biesheuvel LOAD_PHYSICAL_ADDR, 807a1b87d54SArd Biesheuvel EFI_X86_KERNEL_ALLOC_LIMIT); 808a1b87d54SArd Biesheuvel if (status != EFI_SUCCESS) 809a1b87d54SArd Biesheuvel return status; 810a1b87d54SArd Biesheuvel 811a1b87d54SArd Biesheuvel entry = decompress_kernel((void *)addr, virt_addr, error); 812a1b87d54SArd Biesheuvel if (entry == ULONG_MAX) { 813a1b87d54SArd Biesheuvel efi_free(alloc_size, addr); 814a1b87d54SArd Biesheuvel return EFI_LOAD_ERROR; 815a1b87d54SArd Biesheuvel } 816a1b87d54SArd Biesheuvel 817a1b87d54SArd Biesheuvel *kernel_entry = addr + entry; 818a1b87d54SArd Biesheuvel 819c756fd5dSArd Biesheuvel return efi_adjust_memory_range_protection(addr, kernel_total_size); 820a1b87d54SArd Biesheuvel } 821a1b87d54SArd Biesheuvel 822d2d7a54fSArd Biesheuvel static void __noreturn enter_kernel(unsigned long kernel_addr, 823d2d7a54fSArd Biesheuvel struct boot_params *boot_params) 824d2d7a54fSArd Biesheuvel { 825d2d7a54fSArd Biesheuvel /* enter decompressed kernel with boot_params pointer in RSI/ESI */ 826d2d7a54fSArd Biesheuvel asm("jmp *%0"::"r"(kernel_addr), "S"(boot_params)); 827d2d7a54fSArd Biesheuvel 828d2d7a54fSArd Biesheuvel unreachable(); 829d2d7a54fSArd Biesheuvel } 830d2d7a54fSArd Biesheuvel 831c2d0b470SArd Biesheuvel /* 832d2d7a54fSArd Biesheuvel * On success, this routine will jump to the relocated image directly and never 833d2d7a54fSArd Biesheuvel * return. On failure, it will exit to the firmware via efi_exit() instead of 834d2d7a54fSArd Biesheuvel * returning. 835c2d0b470SArd Biesheuvel */ 836df9215f1SArd Biesheuvel void __noreturn efi_stub_entry(efi_handle_t handle, 837c2d0b470SArd Biesheuvel efi_system_table_t *sys_table_arg, 838c2d0b470SArd Biesheuvel struct boot_params *boot_params) 839c2d0b470SArd Biesheuvel { 84011078876SArd Biesheuvel efi_guid_t guid = EFI_MEMORY_ATTRIBUTE_PROTOCOL_GUID; 841c2d0b470SArd Biesheuvel struct setup_header *hdr = &boot_params->hdr; 842f4dc7fffSArd Biesheuvel const struct linux_efi_initrd *initrd = NULL; 843a1b87d54SArd Biesheuvel unsigned long kernel_entry; 844c2d0b470SArd Biesheuvel efi_status_t status; 845c2d0b470SArd Biesheuvel 846db772413SArd Biesheuvel boot_params_pointer = boot_params; 847db772413SArd Biesheuvel 848ccc27ae7SArd Biesheuvel efi_system_table = sys_table_arg; 849c2d0b470SArd Biesheuvel /* Check if we were booted by the EFI firmware */ 850ccc27ae7SArd Biesheuvel if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) 8513b8f44fcSArd Biesheuvel efi_exit(handle, EFI_INVALID_PARAMETER); 852c2d0b470SArd Biesheuvel 85331c77a50SArd Biesheuvel if (have_unsupported_snp_features()) 85431c77a50SArd Biesheuvel efi_exit(handle, EFI_UNSUPPORTED); 85531c77a50SArd Biesheuvel 85611078876SArd Biesheuvel if (IS_ENABLED(CONFIG_EFI_DXE_MEM_ATTRIBUTES)) { 8573ba75c13SBaskov Evgeniy efi_dxe_table = get_efi_config_table(EFI_DXE_SERVICES_TABLE_GUID); 8583ba75c13SBaskov Evgeniy if (efi_dxe_table && 8593ba75c13SBaskov Evgeniy efi_dxe_table->hdr.signature != EFI_DXE_SERVICES_TABLE_SIGNATURE) { 8603ba75c13SBaskov Evgeniy efi_warn("Ignoring DXE services table: invalid signature\n"); 8613ba75c13SBaskov Evgeniy efi_dxe_table = NULL; 8623ba75c13SBaskov Evgeniy } 86311078876SArd Biesheuvel } 86411078876SArd Biesheuvel 86511078876SArd Biesheuvel /* grab the memory attributes protocol if it exists */ 86611078876SArd Biesheuvel efi_bs_call(locate_protocol, &guid, NULL, (void **)&memattr); 8673ba75c13SBaskov Evgeniy 868cb1c9e02SArd Biesheuvel status = efi_setup_5level_paging(); 869cb1c9e02SArd Biesheuvel if (status != EFI_SUCCESS) { 870cb1c9e02SArd Biesheuvel efi_err("efi_setup_5level_paging() failed!\n"); 871cb1c9e02SArd Biesheuvel goto fail; 872cb1c9e02SArd Biesheuvel } 873cb1c9e02SArd Biesheuvel 8747dde67f2SArvind Sankar #ifdef CONFIG_CMDLINE_BOOL 875055042beSArvind Sankar status = efi_parse_options(CONFIG_CMDLINE); 876055042beSArvind Sankar if (status != EFI_SUCCESS) { 877055042beSArvind Sankar efi_err("Failed to parse options\n"); 878055042beSArvind Sankar goto fail; 879055042beSArvind Sankar } 8807dde67f2SArvind Sankar #endif 8817dde67f2SArvind Sankar if (!IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) { 8827dde67f2SArvind Sankar unsigned long cmdline_paddr = ((u64)hdr->cmd_line_ptr | 883c2d0b470SArd Biesheuvel ((u64)boot_params->ext_cmd_line_ptr << 32)); 884055042beSArvind Sankar status = efi_parse_options((char *)cmdline_paddr); 885055042beSArvind Sankar if (status != EFI_SUCCESS) { 886055042beSArvind Sankar efi_err("Failed to parse options\n"); 887055042beSArvind Sankar goto fail; 888055042beSArvind Sankar } 8897dde67f2SArvind Sankar } 890c2d0b470SArd Biesheuvel 891a1b87d54SArd Biesheuvel status = efi_decompress_kernel(&kernel_entry); 892a1b87d54SArd Biesheuvel if (status != EFI_SUCCESS) { 893a1b87d54SArd Biesheuvel efi_err("Failed to decompress kernel\n"); 894a1b87d54SArd Biesheuvel goto fail; 895a1b87d54SArd Biesheuvel } 896a1b87d54SArd Biesheuvel 897c2d0b470SArd Biesheuvel /* 898987053a3SArvind Sankar * At this point, an initrd may already have been loaded by the 899987053a3SArvind Sankar * bootloader and passed via bootparams. We permit an initrd loaded 900987053a3SArvind Sankar * from the LINUX_EFI_INITRD_MEDIA_GUID device path to supersede it. 901987053a3SArvind Sankar * 902987053a3SArvind Sankar * If the device path is not present, any command-line initrd= 903987053a3SArvind Sankar * arguments will be processed only if image is not NULL, which will be 904987053a3SArvind Sankar * the case only if we were loaded via the PE entry point. 905ec93fc37SArd Biesheuvel */ 906f4dc7fffSArd Biesheuvel status = efi_load_initrd(image, hdr->initrd_addr_max, ULONG_MAX, 907f4dc7fffSArd Biesheuvel &initrd); 90820287d56SArd Biesheuvel if (status != EFI_SUCCESS) 909ec93fc37SArd Biesheuvel goto fail; 910f4dc7fffSArd Biesheuvel if (initrd && initrd->size > 0) { 911f4dc7fffSArd Biesheuvel efi_set_u64_split(initrd->base, &hdr->ramdisk_image, 912eed4e019SArvind Sankar &boot_params->ext_ramdisk_image); 913f4dc7fffSArd Biesheuvel efi_set_u64_split(initrd->size, &hdr->ramdisk_size, 914eed4e019SArvind Sankar &boot_params->ext_ramdisk_size); 91579d3219dSArd Biesheuvel } 916ec93fc37SArd Biesheuvel 917f4dc7fffSArd Biesheuvel 918ec93fc37SArd Biesheuvel /* 919c2d0b470SArd Biesheuvel * If the boot loader gave us a value for secure_boot then we use that, 920c2d0b470SArd Biesheuvel * otherwise we ask the BIOS. 921c2d0b470SArd Biesheuvel */ 922c2d0b470SArd Biesheuvel if (boot_params->secure_boot == efi_secureboot_mode_unset) 923c2d0b470SArd Biesheuvel boot_params->secure_boot = efi_get_secureboot(); 924c2d0b470SArd Biesheuvel 925c2d0b470SArd Biesheuvel /* Ask the firmware to clear memory on unclean shutdown */ 926c2d0b470SArd Biesheuvel efi_enable_reset_attack_mitigation(); 927c2d0b470SArd Biesheuvel 928c2d0b470SArd Biesheuvel efi_random_get_seed(); 929c2d0b470SArd Biesheuvel 930c2d0b470SArd Biesheuvel efi_retrieve_tpm2_eventlog(); 931c2d0b470SArd Biesheuvel 932c2d0b470SArd Biesheuvel setup_graphics(boot_params); 933c2d0b470SArd Biesheuvel 934c2d0b470SArd Biesheuvel setup_efi_pci(boot_params); 935c2d0b470SArd Biesheuvel 936a1b87d54SArd Biesheuvel setup_quirks(boot_params); 937c2d0b470SArd Biesheuvel 938c0461bd1SDionna Glaze setup_unaccepted_memory(); 939c0461bd1SDionna Glaze 940c2d0b470SArd Biesheuvel status = exit_boot(boot_params, handle); 941c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 94236bdd0a7SArvind Sankar efi_err("exit_boot() failed!\n"); 943c2d0b470SArd Biesheuvel goto fail; 944c2d0b470SArd Biesheuvel } 945c2d0b470SArd Biesheuvel 946a1b87d54SArd Biesheuvel /* 947a1b87d54SArd Biesheuvel * Call the SEV init code while still running with the firmware's 948a1b87d54SArd Biesheuvel * GDT/IDT, so #VC exceptions will be handled by EFI. 949a1b87d54SArd Biesheuvel */ 950a1b87d54SArd Biesheuvel sev_enable(boot_params); 951a1b87d54SArd Biesheuvel 952cb1c9e02SArd Biesheuvel efi_5level_switch(); 953cb1c9e02SArd Biesheuvel 954a1b87d54SArd Biesheuvel enter_kernel(kernel_entry, boot_params); 955c2d0b470SArd Biesheuvel fail: 956df9215f1SArd Biesheuvel efi_err("efi_stub_entry() failed!\n"); 957c2d0b470SArd Biesheuvel 9583b8f44fcSArd Biesheuvel efi_exit(handle, status); 959c2d0b470SArd Biesheuvel } 960df9215f1SArd Biesheuvel 961df9215f1SArd Biesheuvel #ifdef CONFIG_EFI_HANDOVER_PROTOCOL 962d7156b98SArd Biesheuvel void efi_handover_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg, 963d7156b98SArd Biesheuvel struct boot_params *boot_params) 964d7156b98SArd Biesheuvel { 965d7156b98SArd Biesheuvel memset(_bss, 0, _ebss - _bss); 966d7156b98SArd Biesheuvel efi_stub_entry(handle, sys_table_arg, boot_params); 967d7156b98SArd Biesheuvel } 968d7156b98SArd Biesheuvel 969df9215f1SArd Biesheuvel #ifndef CONFIG_EFI_MIXED 970d7156b98SArd Biesheuvel extern __alias(efi_handover_entry) 971df9215f1SArd Biesheuvel void efi32_stub_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg, 972df9215f1SArd Biesheuvel struct boot_params *boot_params); 973df9215f1SArd Biesheuvel 974d7156b98SArd Biesheuvel extern __alias(efi_handover_entry) 975df9215f1SArd Biesheuvel void efi64_stub_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg, 976df9215f1SArd Biesheuvel struct boot_params *boot_params); 977df9215f1SArd Biesheuvel #endif 978df9215f1SArd Biesheuvel #endif 979