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> 18c2d0b470SArd Biesheuvel 19c2d0b470SArd Biesheuvel #include "efistub.h" 20*cb1c9e02SArd Biesheuvel #include "x86-stub.h" 21c2d0b470SArd Biesheuvel 22d5cdf4cfSArvind Sankar /* Maximum physical address for 64-bit kernel with 4-level paging */ 23d5cdf4cfSArvind Sankar #define MAXMEM_X86_64_4LEVEL (1ull << 46) 24d5cdf4cfSArvind Sankar 25ccc27ae7SArd Biesheuvel const efi_system_table_t *efi_system_table; 263ba75c13SBaskov Evgeniy const efi_dxe_services_table_t *efi_dxe_table; 274b520162SArd Biesheuvel u32 image_offset __section(".data"); 28987053a3SArvind Sankar static efi_loaded_image_t *image = NULL; 29c2d0b470SArd Biesheuvel 30c0461bd1SDionna Glaze typedef union sev_memory_acceptance_protocol sev_memory_acceptance_protocol_t; 31c0461bd1SDionna Glaze union sev_memory_acceptance_protocol { 32c0461bd1SDionna Glaze struct { 33c0461bd1SDionna Glaze efi_status_t (__efiapi * allow_unaccepted_memory)( 34c0461bd1SDionna Glaze sev_memory_acceptance_protocol_t *); 35c0461bd1SDionna Glaze }; 36c0461bd1SDionna Glaze struct { 37c0461bd1SDionna Glaze u32 allow_unaccepted_memory; 38c0461bd1SDionna Glaze } mixed_mode; 39c0461bd1SDionna Glaze }; 40c0461bd1SDionna Glaze 41c2d0b470SArd Biesheuvel static efi_status_t 42c2d0b470SArd Biesheuvel preserve_pci_rom_image(efi_pci_io_protocol_t *pci, struct pci_setup_rom **__rom) 43c2d0b470SArd Biesheuvel { 44c2d0b470SArd Biesheuvel struct pci_setup_rom *rom = NULL; 45c2d0b470SArd Biesheuvel efi_status_t status; 46c2d0b470SArd Biesheuvel unsigned long size; 47c2d0b470SArd Biesheuvel uint64_t romsize; 48c2d0b470SArd Biesheuvel void *romimage; 49c2d0b470SArd Biesheuvel 50c2d0b470SArd Biesheuvel /* 51c2d0b470SArd Biesheuvel * Some firmware images contain EFI function pointers at the place where 52c2d0b470SArd Biesheuvel * the romimage and romsize fields are supposed to be. Typically the EFI 53c2d0b470SArd Biesheuvel * code is mapped at high addresses, translating to an unrealistically 54c2d0b470SArd Biesheuvel * large romsize. The UEFI spec limits the size of option ROMs to 16 55c2d0b470SArd Biesheuvel * MiB so we reject any ROMs over 16 MiB in size to catch this. 56c2d0b470SArd Biesheuvel */ 57c2d0b470SArd Biesheuvel romimage = efi_table_attr(pci, romimage); 58c2d0b470SArd Biesheuvel romsize = efi_table_attr(pci, romsize); 59c2d0b470SArd Biesheuvel if (!romimage || !romsize || romsize > SZ_16M) 60c2d0b470SArd Biesheuvel return EFI_INVALID_PARAMETER; 61c2d0b470SArd Biesheuvel 62c2d0b470SArd Biesheuvel size = romsize + sizeof(*rom); 63c2d0b470SArd Biesheuvel 64c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 65c2d0b470SArd Biesheuvel (void **)&rom); 66c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 6736bdd0a7SArvind Sankar efi_err("Failed to allocate memory for 'rom'\n"); 68c2d0b470SArd Biesheuvel return status; 69c2d0b470SArd Biesheuvel } 70c2d0b470SArd Biesheuvel 71c2d0b470SArd Biesheuvel memset(rom, 0, sizeof(*rom)); 72c2d0b470SArd Biesheuvel 73c2d0b470SArd Biesheuvel rom->data.type = SETUP_PCI; 74c2d0b470SArd Biesheuvel rom->data.len = size - sizeof(struct setup_data); 75c2d0b470SArd Biesheuvel rom->data.next = 0; 76c2d0b470SArd Biesheuvel rom->pcilen = pci->romsize; 77c2d0b470SArd Biesheuvel *__rom = rom; 78c2d0b470SArd Biesheuvel 79c2d0b470SArd Biesheuvel status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16, 80c2d0b470SArd Biesheuvel PCI_VENDOR_ID, 1, &rom->vendor); 81c2d0b470SArd Biesheuvel 82c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 8336bdd0a7SArvind Sankar efi_err("Failed to read rom->vendor\n"); 84c2d0b470SArd Biesheuvel goto free_struct; 85c2d0b470SArd Biesheuvel } 86c2d0b470SArd Biesheuvel 87c2d0b470SArd Biesheuvel status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16, 88c2d0b470SArd Biesheuvel PCI_DEVICE_ID, 1, &rom->devid); 89c2d0b470SArd Biesheuvel 90c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 9136bdd0a7SArvind Sankar efi_err("Failed to read rom->devid\n"); 92c2d0b470SArd Biesheuvel goto free_struct; 93c2d0b470SArd Biesheuvel } 94c2d0b470SArd Biesheuvel 95c2d0b470SArd Biesheuvel status = efi_call_proto(pci, get_location, &rom->segment, &rom->bus, 96c2d0b470SArd Biesheuvel &rom->device, &rom->function); 97c2d0b470SArd Biesheuvel 98c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 99c2d0b470SArd Biesheuvel goto free_struct; 100c2d0b470SArd Biesheuvel 101c2d0b470SArd Biesheuvel memcpy(rom->romdata, romimage, romsize); 102c2d0b470SArd Biesheuvel return status; 103c2d0b470SArd Biesheuvel 104c2d0b470SArd Biesheuvel free_struct: 105c2d0b470SArd Biesheuvel efi_bs_call(free_pool, rom); 106c2d0b470SArd Biesheuvel return status; 107c2d0b470SArd Biesheuvel } 108c2d0b470SArd Biesheuvel 109c2d0b470SArd Biesheuvel /* 110c2d0b470SArd Biesheuvel * There's no way to return an informative status from this function, 111c2d0b470SArd Biesheuvel * because any analysis (and printing of error messages) needs to be 112c2d0b470SArd Biesheuvel * done directly at the EFI function call-site. 113c2d0b470SArd Biesheuvel * 114c2d0b470SArd Biesheuvel * For example, EFI_INVALID_PARAMETER could indicate a bug or maybe we 115c2d0b470SArd Biesheuvel * just didn't find any PCI devices, but there's no way to tell outside 116c2d0b470SArd Biesheuvel * the context of the call. 117c2d0b470SArd Biesheuvel */ 118c2d0b470SArd Biesheuvel static void setup_efi_pci(struct boot_params *params) 119c2d0b470SArd Biesheuvel { 120c2d0b470SArd Biesheuvel efi_status_t status; 121c2d0b470SArd Biesheuvel void **pci_handle = NULL; 122c2d0b470SArd Biesheuvel efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID; 123c2d0b470SArd Biesheuvel unsigned long size = 0; 124c2d0b470SArd Biesheuvel struct setup_data *data; 125c2d0b470SArd Biesheuvel efi_handle_t h; 126c2d0b470SArd Biesheuvel int i; 127c2d0b470SArd Biesheuvel 128c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 129c2d0b470SArd Biesheuvel &pci_proto, NULL, &size, pci_handle); 130c2d0b470SArd Biesheuvel 131c2d0b470SArd Biesheuvel if (status == EFI_BUFFER_TOO_SMALL) { 132c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 133c2d0b470SArd Biesheuvel (void **)&pci_handle); 134c2d0b470SArd Biesheuvel 135c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 13636bdd0a7SArvind Sankar efi_err("Failed to allocate memory for 'pci_handle'\n"); 137c2d0b470SArd Biesheuvel return; 138c2d0b470SArd Biesheuvel } 139c2d0b470SArd Biesheuvel 140c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 141c2d0b470SArd Biesheuvel &pci_proto, NULL, &size, pci_handle); 142c2d0b470SArd Biesheuvel } 143c2d0b470SArd Biesheuvel 144c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 145c2d0b470SArd Biesheuvel goto free_handle; 146c2d0b470SArd Biesheuvel 147c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)params->hdr.setup_data; 148c2d0b470SArd Biesheuvel 149c2d0b470SArd Biesheuvel while (data && data->next) 150c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)data->next; 151c2d0b470SArd Biesheuvel 152c2d0b470SArd Biesheuvel for_each_efi_handle(h, pci_handle, size, i) { 153c2d0b470SArd Biesheuvel efi_pci_io_protocol_t *pci = NULL; 154c2d0b470SArd Biesheuvel struct pci_setup_rom *rom; 155c2d0b470SArd Biesheuvel 156c2d0b470SArd Biesheuvel status = efi_bs_call(handle_protocol, h, &pci_proto, 157c2d0b470SArd Biesheuvel (void **)&pci); 158c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS || !pci) 159c2d0b470SArd Biesheuvel continue; 160c2d0b470SArd Biesheuvel 161c2d0b470SArd Biesheuvel status = preserve_pci_rom_image(pci, &rom); 162c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 163c2d0b470SArd Biesheuvel continue; 164c2d0b470SArd Biesheuvel 165c2d0b470SArd Biesheuvel if (data) 166c2d0b470SArd Biesheuvel data->next = (unsigned long)rom; 167c2d0b470SArd Biesheuvel else 168c2d0b470SArd Biesheuvel params->hdr.setup_data = (unsigned long)rom; 169c2d0b470SArd Biesheuvel 170c2d0b470SArd Biesheuvel data = (struct setup_data *)rom; 171c2d0b470SArd Biesheuvel } 172c2d0b470SArd Biesheuvel 173c2d0b470SArd Biesheuvel free_handle: 174c2d0b470SArd Biesheuvel efi_bs_call(free_pool, pci_handle); 175c2d0b470SArd Biesheuvel } 176c2d0b470SArd Biesheuvel 177c2d0b470SArd Biesheuvel static void retrieve_apple_device_properties(struct boot_params *boot_params) 178c2d0b470SArd Biesheuvel { 179c2d0b470SArd Biesheuvel efi_guid_t guid = APPLE_PROPERTIES_PROTOCOL_GUID; 180c2d0b470SArd Biesheuvel struct setup_data *data, *new; 181c2d0b470SArd Biesheuvel efi_status_t status; 182c2d0b470SArd Biesheuvel u32 size = 0; 183c2d0b470SArd Biesheuvel apple_properties_protocol_t *p; 184c2d0b470SArd Biesheuvel 185c2d0b470SArd Biesheuvel status = efi_bs_call(locate_protocol, &guid, NULL, (void **)&p); 186c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 187c2d0b470SArd Biesheuvel return; 188c2d0b470SArd Biesheuvel 189c2d0b470SArd Biesheuvel if (efi_table_attr(p, version) != 0x10000) { 19036bdd0a7SArvind Sankar efi_err("Unsupported properties proto version\n"); 191c2d0b470SArd Biesheuvel return; 192c2d0b470SArd Biesheuvel } 193c2d0b470SArd Biesheuvel 194c2d0b470SArd Biesheuvel efi_call_proto(p, get_all, NULL, &size); 195c2d0b470SArd Biesheuvel if (!size) 196c2d0b470SArd Biesheuvel return; 197c2d0b470SArd Biesheuvel 198c2d0b470SArd Biesheuvel do { 199c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, 200c2d0b470SArd Biesheuvel size + sizeof(struct setup_data), 201c2d0b470SArd Biesheuvel (void **)&new); 202c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 20336bdd0a7SArvind Sankar efi_err("Failed to allocate memory for 'properties'\n"); 204c2d0b470SArd Biesheuvel return; 205c2d0b470SArd Biesheuvel } 206c2d0b470SArd Biesheuvel 207c2d0b470SArd Biesheuvel status = efi_call_proto(p, get_all, new->data, &size); 208c2d0b470SArd Biesheuvel 209c2d0b470SArd Biesheuvel if (status == EFI_BUFFER_TOO_SMALL) 210c2d0b470SArd Biesheuvel efi_bs_call(free_pool, new); 211c2d0b470SArd Biesheuvel } while (status == EFI_BUFFER_TOO_SMALL); 212c2d0b470SArd Biesheuvel 213c2d0b470SArd Biesheuvel new->type = SETUP_APPLE_PROPERTIES; 214c2d0b470SArd Biesheuvel new->len = size; 215c2d0b470SArd Biesheuvel new->next = 0; 216c2d0b470SArd Biesheuvel 217c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)boot_params->hdr.setup_data; 218c2d0b470SArd Biesheuvel if (!data) { 219c2d0b470SArd Biesheuvel boot_params->hdr.setup_data = (unsigned long)new; 220c2d0b470SArd Biesheuvel } else { 221c2d0b470SArd Biesheuvel while (data->next) 222c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)data->next; 223c2d0b470SArd Biesheuvel data->next = (unsigned long)new; 224c2d0b470SArd Biesheuvel } 225c2d0b470SArd Biesheuvel } 226c2d0b470SArd Biesheuvel 227*cb1c9e02SArd Biesheuvel void efi_adjust_memory_range_protection(unsigned long start, 228*cb1c9e02SArd Biesheuvel unsigned long size) 22982e0d6d7SBaskov Evgeniy { 23082e0d6d7SBaskov Evgeniy efi_status_t status; 23182e0d6d7SBaskov Evgeniy efi_gcd_memory_space_desc_t desc; 23282e0d6d7SBaskov Evgeniy unsigned long end, next; 23382e0d6d7SBaskov Evgeniy unsigned long rounded_start, rounded_end; 23482e0d6d7SBaskov Evgeniy unsigned long unprotect_start, unprotect_size; 23582e0d6d7SBaskov Evgeniy 23682e0d6d7SBaskov Evgeniy if (efi_dxe_table == NULL) 23782e0d6d7SBaskov Evgeniy return; 23882e0d6d7SBaskov Evgeniy 23982e0d6d7SBaskov Evgeniy rounded_start = rounddown(start, EFI_PAGE_SIZE); 24082e0d6d7SBaskov Evgeniy rounded_end = roundup(start + size, EFI_PAGE_SIZE); 24182e0d6d7SBaskov Evgeniy 24282e0d6d7SBaskov Evgeniy /* 24382e0d6d7SBaskov Evgeniy * Don't modify memory region attributes, they are 24482e0d6d7SBaskov Evgeniy * already suitable, to lower the possibility to 24582e0d6d7SBaskov Evgeniy * encounter firmware bugs. 24682e0d6d7SBaskov Evgeniy */ 24782e0d6d7SBaskov Evgeniy 24882e0d6d7SBaskov Evgeniy for (end = start + size; start < end; start = next) { 24982e0d6d7SBaskov Evgeniy 25082e0d6d7SBaskov Evgeniy status = efi_dxe_call(get_memory_space_descriptor, start, &desc); 25182e0d6d7SBaskov Evgeniy 25282e0d6d7SBaskov Evgeniy if (status != EFI_SUCCESS) 25382e0d6d7SBaskov Evgeniy return; 25482e0d6d7SBaskov Evgeniy 25582e0d6d7SBaskov Evgeniy next = desc.base_address + desc.length; 25682e0d6d7SBaskov Evgeniy 25782e0d6d7SBaskov Evgeniy /* 25882e0d6d7SBaskov Evgeniy * Only system memory is suitable for trampoline/kernel image placement, 25982e0d6d7SBaskov Evgeniy * so only this type of memory needs its attributes to be modified. 26082e0d6d7SBaskov Evgeniy */ 26182e0d6d7SBaskov Evgeniy 26282e0d6d7SBaskov Evgeniy if (desc.gcd_memory_type != EfiGcdMemoryTypeSystemMemory || 26382e0d6d7SBaskov Evgeniy (desc.attributes & (EFI_MEMORY_RO | EFI_MEMORY_XP)) == 0) 26482e0d6d7SBaskov Evgeniy continue; 26582e0d6d7SBaskov Evgeniy 26682e0d6d7SBaskov Evgeniy unprotect_start = max(rounded_start, (unsigned long)desc.base_address); 26782e0d6d7SBaskov Evgeniy unprotect_size = min(rounded_end, next) - unprotect_start; 26882e0d6d7SBaskov Evgeniy 26982e0d6d7SBaskov Evgeniy status = efi_dxe_call(set_memory_space_attributes, 27082e0d6d7SBaskov Evgeniy unprotect_start, unprotect_size, 27182e0d6d7SBaskov Evgeniy EFI_MEMORY_WB); 27282e0d6d7SBaskov Evgeniy 27382e0d6d7SBaskov Evgeniy if (status != EFI_SUCCESS) { 27431f1a0edSArd Biesheuvel efi_warn("Unable to unprotect memory range [%08lx,%08lx]: %lx\n", 27582e0d6d7SBaskov Evgeniy unprotect_start, 27682e0d6d7SBaskov Evgeniy unprotect_start + unprotect_size, 27731f1a0edSArd Biesheuvel status); 27882e0d6d7SBaskov Evgeniy } 27982e0d6d7SBaskov Evgeniy } 28082e0d6d7SBaskov Evgeniy } 28182e0d6d7SBaskov Evgeniy 282d2d7a54fSArd Biesheuvel extern const u8 startup_32[], startup_64[]; 28382e0d6d7SBaskov Evgeniy 28482e0d6d7SBaskov Evgeniy static void 28582e0d6d7SBaskov Evgeniy setup_memory_protection(unsigned long image_base, unsigned long image_size) 28682e0d6d7SBaskov Evgeniy { 28782e0d6d7SBaskov Evgeniy #ifdef CONFIG_64BIT 28882e0d6d7SBaskov Evgeniy if (image_base != (unsigned long)startup_32) 289*cb1c9e02SArd Biesheuvel efi_adjust_memory_range_protection(image_base, image_size); 29082e0d6d7SBaskov Evgeniy #else 29182e0d6d7SBaskov Evgeniy /* 29282e0d6d7SBaskov Evgeniy * Clear protection flags on a whole range of possible 29382e0d6d7SBaskov Evgeniy * addresses used for KASLR. We don't need to do that 29482e0d6d7SBaskov Evgeniy * on x86_64, since KASLR/extraction is performed after 29582e0d6d7SBaskov Evgeniy * dedicated identity page tables are built and we only 29682e0d6d7SBaskov Evgeniy * need to remove possible protection on relocated image 29782e0d6d7SBaskov Evgeniy * itself disregarding further relocations. 29882e0d6d7SBaskov Evgeniy */ 299*cb1c9e02SArd Biesheuvel efi_adjust_memory_range_protection(LOAD_PHYSICAL_ADDR, 30082e0d6d7SBaskov Evgeniy KERNEL_IMAGE_SIZE - LOAD_PHYSICAL_ADDR); 30182e0d6d7SBaskov Evgeniy #endif 30282e0d6d7SBaskov Evgeniy } 30382e0d6d7SBaskov Evgeniy 304c0461bd1SDionna Glaze static void setup_unaccepted_memory(void) 305c0461bd1SDionna Glaze { 306c0461bd1SDionna Glaze efi_guid_t mem_acceptance_proto = OVMF_SEV_MEMORY_ACCEPTANCE_PROTOCOL_GUID; 307c0461bd1SDionna Glaze sev_memory_acceptance_protocol_t *proto; 308c0461bd1SDionna Glaze efi_status_t status; 309c0461bd1SDionna Glaze 310c0461bd1SDionna Glaze if (!IS_ENABLED(CONFIG_UNACCEPTED_MEMORY)) 311c0461bd1SDionna Glaze return; 312c0461bd1SDionna Glaze 313c0461bd1SDionna Glaze /* 314c0461bd1SDionna Glaze * Enable unaccepted memory before calling exit boot services in order 315c0461bd1SDionna Glaze * for the UEFI to not accept all memory on EBS. 316c0461bd1SDionna Glaze */ 317c0461bd1SDionna Glaze status = efi_bs_call(locate_protocol, &mem_acceptance_proto, NULL, 318c0461bd1SDionna Glaze (void **)&proto); 319c0461bd1SDionna Glaze if (status != EFI_SUCCESS) 320c0461bd1SDionna Glaze return; 321c0461bd1SDionna Glaze 322c0461bd1SDionna Glaze status = efi_call_proto(proto, allow_unaccepted_memory); 323c0461bd1SDionna Glaze if (status != EFI_SUCCESS) 324c0461bd1SDionna Glaze efi_err("Memory acceptance protocol failed\n"); 325c0461bd1SDionna Glaze } 326c0461bd1SDionna Glaze 327c2d0b470SArd Biesheuvel static const efi_char16_t apple[] = L"Apple"; 328c2d0b470SArd Biesheuvel 32982e0d6d7SBaskov Evgeniy static void setup_quirks(struct boot_params *boot_params, 33082e0d6d7SBaskov Evgeniy unsigned long image_base, 33182e0d6d7SBaskov Evgeniy unsigned long image_size) 332c2d0b470SArd Biesheuvel { 333c2d0b470SArd Biesheuvel efi_char16_t *fw_vendor = (efi_char16_t *)(unsigned long) 334ccc27ae7SArd Biesheuvel efi_table_attr(efi_system_table, fw_vendor); 335c2d0b470SArd Biesheuvel 336c2d0b470SArd Biesheuvel if (!memcmp(fw_vendor, apple, sizeof(apple))) { 337c2d0b470SArd Biesheuvel if (IS_ENABLED(CONFIG_APPLE_PROPERTIES)) 338c2d0b470SArd Biesheuvel retrieve_apple_device_properties(boot_params); 339c2d0b470SArd Biesheuvel } 34082e0d6d7SBaskov Evgeniy 34182e0d6d7SBaskov Evgeniy if (IS_ENABLED(CONFIG_EFI_DXE_MEM_ATTRIBUTES)) 34282e0d6d7SBaskov Evgeniy setup_memory_protection(image_base, image_size); 343c2d0b470SArd Biesheuvel } 344c2d0b470SArd Biesheuvel 345c2d0b470SArd Biesheuvel /* 346c2d0b470SArd Biesheuvel * See if we have Universal Graphics Adapter (UGA) protocol 347c2d0b470SArd Biesheuvel */ 348c2d0b470SArd Biesheuvel static efi_status_t 349c2d0b470SArd Biesheuvel setup_uga(struct screen_info *si, efi_guid_t *uga_proto, unsigned long size) 350c2d0b470SArd Biesheuvel { 351c2d0b470SArd Biesheuvel efi_status_t status; 352c2d0b470SArd Biesheuvel u32 width, height; 353c2d0b470SArd Biesheuvel void **uga_handle = NULL; 354c2d0b470SArd Biesheuvel efi_uga_draw_protocol_t *uga = NULL, *first_uga; 355c2d0b470SArd Biesheuvel efi_handle_t handle; 356c2d0b470SArd Biesheuvel int i; 357c2d0b470SArd Biesheuvel 358c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 359c2d0b470SArd Biesheuvel (void **)&uga_handle); 360c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 361c2d0b470SArd Biesheuvel return status; 362c2d0b470SArd Biesheuvel 363c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 364c2d0b470SArd Biesheuvel uga_proto, NULL, &size, uga_handle); 365c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 366c2d0b470SArd Biesheuvel goto free_handle; 367c2d0b470SArd Biesheuvel 368c2d0b470SArd Biesheuvel height = 0; 369c2d0b470SArd Biesheuvel width = 0; 370c2d0b470SArd Biesheuvel 371c2d0b470SArd Biesheuvel first_uga = NULL; 372c2d0b470SArd Biesheuvel for_each_efi_handle(handle, uga_handle, size, i) { 373c2d0b470SArd Biesheuvel efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID; 374c2d0b470SArd Biesheuvel u32 w, h, depth, refresh; 375c2d0b470SArd Biesheuvel void *pciio; 376c2d0b470SArd Biesheuvel 377c2d0b470SArd Biesheuvel status = efi_bs_call(handle_protocol, handle, uga_proto, 378c2d0b470SArd Biesheuvel (void **)&uga); 379c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 380c2d0b470SArd Biesheuvel continue; 381c2d0b470SArd Biesheuvel 382c2d0b470SArd Biesheuvel pciio = NULL; 383c2d0b470SArd Biesheuvel efi_bs_call(handle_protocol, handle, &pciio_proto, &pciio); 384c2d0b470SArd Biesheuvel 385c2d0b470SArd Biesheuvel status = efi_call_proto(uga, get_mode, &w, &h, &depth, &refresh); 386c2d0b470SArd Biesheuvel if (status == EFI_SUCCESS && (!first_uga || pciio)) { 387c2d0b470SArd Biesheuvel width = w; 388c2d0b470SArd Biesheuvel height = h; 389c2d0b470SArd Biesheuvel 390c2d0b470SArd Biesheuvel /* 391c2d0b470SArd Biesheuvel * Once we've found a UGA supporting PCIIO, 392c2d0b470SArd Biesheuvel * don't bother looking any further. 393c2d0b470SArd Biesheuvel */ 394c2d0b470SArd Biesheuvel if (pciio) 395c2d0b470SArd Biesheuvel break; 396c2d0b470SArd Biesheuvel 397c2d0b470SArd Biesheuvel first_uga = uga; 398c2d0b470SArd Biesheuvel } 399c2d0b470SArd Biesheuvel } 400c2d0b470SArd Biesheuvel 401c2d0b470SArd Biesheuvel if (!width && !height) 402c2d0b470SArd Biesheuvel goto free_handle; 403c2d0b470SArd Biesheuvel 404c2d0b470SArd Biesheuvel /* EFI framebuffer */ 405c2d0b470SArd Biesheuvel si->orig_video_isVGA = VIDEO_TYPE_EFI; 406c2d0b470SArd Biesheuvel 407c2d0b470SArd Biesheuvel si->lfb_depth = 32; 408c2d0b470SArd Biesheuvel si->lfb_width = width; 409c2d0b470SArd Biesheuvel si->lfb_height = height; 410c2d0b470SArd Biesheuvel 411c2d0b470SArd Biesheuvel si->red_size = 8; 412c2d0b470SArd Biesheuvel si->red_pos = 16; 413c2d0b470SArd Biesheuvel si->green_size = 8; 414c2d0b470SArd Biesheuvel si->green_pos = 8; 415c2d0b470SArd Biesheuvel si->blue_size = 8; 416c2d0b470SArd Biesheuvel si->blue_pos = 0; 417c2d0b470SArd Biesheuvel si->rsvd_size = 8; 418c2d0b470SArd Biesheuvel si->rsvd_pos = 24; 419c2d0b470SArd Biesheuvel 420c2d0b470SArd Biesheuvel free_handle: 421c2d0b470SArd Biesheuvel efi_bs_call(free_pool, uga_handle); 422c2d0b470SArd Biesheuvel 423c2d0b470SArd Biesheuvel return status; 424c2d0b470SArd Biesheuvel } 425c2d0b470SArd Biesheuvel 426c2d0b470SArd Biesheuvel static void setup_graphics(struct boot_params *boot_params) 427c2d0b470SArd Biesheuvel { 428c2d0b470SArd Biesheuvel efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID; 429c2d0b470SArd Biesheuvel struct screen_info *si; 430c2d0b470SArd Biesheuvel efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID; 431c2d0b470SArd Biesheuvel efi_status_t status; 432c2d0b470SArd Biesheuvel unsigned long size; 433c2d0b470SArd Biesheuvel void **gop_handle = NULL; 434c2d0b470SArd Biesheuvel void **uga_handle = NULL; 435c2d0b470SArd Biesheuvel 436c2d0b470SArd Biesheuvel si = &boot_params->screen_info; 437c2d0b470SArd Biesheuvel memset(si, 0, sizeof(*si)); 438c2d0b470SArd Biesheuvel 439c2d0b470SArd Biesheuvel size = 0; 440c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 441c2d0b470SArd Biesheuvel &graphics_proto, NULL, &size, gop_handle); 442c2d0b470SArd Biesheuvel if (status == EFI_BUFFER_TOO_SMALL) 443c2d0b470SArd Biesheuvel status = efi_setup_gop(si, &graphics_proto, size); 444c2d0b470SArd Biesheuvel 445c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 446c2d0b470SArd Biesheuvel size = 0; 447c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 448c2d0b470SArd Biesheuvel &uga_proto, NULL, &size, uga_handle); 449c2d0b470SArd Biesheuvel if (status == EFI_BUFFER_TOO_SMALL) 450c2d0b470SArd Biesheuvel setup_uga(si, &uga_proto, size); 451c2d0b470SArd Biesheuvel } 452c2d0b470SArd Biesheuvel } 453c2d0b470SArd Biesheuvel 4543b8f44fcSArd Biesheuvel 4553b8f44fcSArd Biesheuvel static void __noreturn efi_exit(efi_handle_t handle, efi_status_t status) 4563b8f44fcSArd Biesheuvel { 4573b8f44fcSArd Biesheuvel efi_bs_call(exit, handle, status, 0, NULL); 458f3fa0efcSArd Biesheuvel for(;;) 459f3fa0efcSArd Biesheuvel asm("hlt"); 4603b8f44fcSArd Biesheuvel } 4613b8f44fcSArd Biesheuvel 462c2d0b470SArd Biesheuvel void __noreturn efi_stub_entry(efi_handle_t handle, 463c2d0b470SArd Biesheuvel efi_system_table_t *sys_table_arg, 464c2d0b470SArd Biesheuvel struct boot_params *boot_params); 465c2d0b470SArd Biesheuvel 466c2d0b470SArd Biesheuvel /* 467c2d0b470SArd Biesheuvel * Because the x86 boot code expects to be passed a boot_params we 468c2d0b470SArd Biesheuvel * need to create one ourselves (usually the bootloader would create 469c2d0b470SArd Biesheuvel * one for us). 470c2d0b470SArd Biesheuvel */ 471c2d0b470SArd Biesheuvel efi_status_t __efiapi efi_pe_entry(efi_handle_t handle, 472c2d0b470SArd Biesheuvel efi_system_table_t *sys_table_arg) 473c2d0b470SArd Biesheuvel { 474c2d0b470SArd Biesheuvel struct boot_params *boot_params; 475c2d0b470SArd Biesheuvel struct setup_header *hdr; 4761887c9b6SArvind Sankar void *image_base; 477c2d0b470SArd Biesheuvel efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID; 478c2d0b470SArd Biesheuvel int options_size = 0; 479c2d0b470SArd Biesheuvel efi_status_t status; 480c2d0b470SArd Biesheuvel char *cmdline_ptr; 481c2d0b470SArd Biesheuvel 482ccc27ae7SArd Biesheuvel efi_system_table = sys_table_arg; 483c2d0b470SArd Biesheuvel 484c2d0b470SArd Biesheuvel /* Check if we were booted by the EFI firmware */ 485ccc27ae7SArd Biesheuvel if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) 4863b8f44fcSArd Biesheuvel efi_exit(handle, EFI_INVALID_PARAMETER); 487c2d0b470SArd Biesheuvel 4880347d8c2SArvind Sankar status = efi_bs_call(handle_protocol, handle, &proto, (void **)&image); 489c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 49036bdd0a7SArvind Sankar efi_err("Failed to get handle for LOADED_IMAGE_PROTOCOL\n"); 4913b8f44fcSArd Biesheuvel efi_exit(handle, status); 492c2d0b470SArd Biesheuvel } 493c2d0b470SArd Biesheuvel 4941887c9b6SArvind Sankar image_base = efi_table_attr(image, image_base); 4951887c9b6SArvind Sankar image_offset = (void *)startup_32 - image_base; 4961887c9b6SArvind Sankar 497019512f1SArvind Sankar status = efi_allocate_pages(sizeof(struct boot_params), 498019512f1SArvind Sankar (unsigned long *)&boot_params, ULONG_MAX); 499c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 50036bdd0a7SArvind Sankar efi_err("Failed to allocate lowmem for boot params\n"); 5013b8f44fcSArd Biesheuvel efi_exit(handle, status); 502c2d0b470SArd Biesheuvel } 503c2d0b470SArd Biesheuvel 504019512f1SArvind Sankar memset(boot_params, 0x0, sizeof(struct boot_params)); 505c2d0b470SArd Biesheuvel 506c2d0b470SArd Biesheuvel hdr = &boot_params->hdr; 507c2d0b470SArd Biesheuvel 50859476f80SArvind Sankar /* Copy the setup header from the second sector to boot_params */ 50959476f80SArvind Sankar memcpy(&hdr->jump, image_base + 512, 51059476f80SArvind Sankar sizeof(struct setup_header) - offsetof(struct setup_header, jump)); 511c2d0b470SArd Biesheuvel 512c2d0b470SArd Biesheuvel /* 513c2d0b470SArd Biesheuvel * Fill out some of the header fields ourselves because the 514c2d0b470SArd Biesheuvel * EFI firmware loader doesn't load the first sector. 515c2d0b470SArd Biesheuvel */ 516c2d0b470SArd Biesheuvel hdr->root_flags = 1; 517c2d0b470SArd Biesheuvel hdr->vid_mode = 0xffff; 518c2d0b470SArd Biesheuvel hdr->boot_flag = 0xAA55; 519c2d0b470SArd Biesheuvel 520c2d0b470SArd Biesheuvel hdr->type_of_loader = 0x21; 521c2d0b470SArd Biesheuvel 522c2d0b470SArd Biesheuvel /* Convert unicode cmdline to ascii */ 52327cd5511SArd Biesheuvel cmdline_ptr = efi_convert_cmdline(image, &options_size); 524c2d0b470SArd Biesheuvel if (!cmdline_ptr) 525c2d0b470SArd Biesheuvel goto fail; 526c2d0b470SArd Biesheuvel 527eed4e019SArvind Sankar efi_set_u64_split((unsigned long)cmdline_ptr, 528eed4e019SArvind Sankar &hdr->cmd_line_ptr, &boot_params->ext_cmd_line_ptr); 529c2d0b470SArd Biesheuvel 530c2d0b470SArd Biesheuvel hdr->ramdisk_image = 0; 531c2d0b470SArd Biesheuvel hdr->ramdisk_size = 0; 532c2d0b470SArd Biesheuvel 53363bf28ceSArd Biesheuvel /* 53463bf28ceSArd Biesheuvel * Disregard any setup data that was provided by the bootloader: 53563bf28ceSArd Biesheuvel * setup_data could be pointing anywhere, and we have no way of 53663bf28ceSArd Biesheuvel * authenticating or validating the payload. 53763bf28ceSArd Biesheuvel */ 53863bf28ceSArd Biesheuvel hdr->setup_data = 0; 53963bf28ceSArd Biesheuvel 540ccc27ae7SArd Biesheuvel efi_stub_entry(handle, sys_table_arg, boot_params); 541c2d0b470SArd Biesheuvel /* not reached */ 542c2d0b470SArd Biesheuvel 543c2d0b470SArd Biesheuvel fail: 544019512f1SArvind Sankar efi_free(sizeof(struct boot_params), (unsigned long)boot_params); 545c2d0b470SArd Biesheuvel 5463b8f44fcSArd Biesheuvel efi_exit(handle, status); 547c2d0b470SArd Biesheuvel } 548c2d0b470SArd Biesheuvel 549c2d0b470SArd Biesheuvel static void add_e820ext(struct boot_params *params, 550c2d0b470SArd Biesheuvel struct setup_data *e820ext, u32 nr_entries) 551c2d0b470SArd Biesheuvel { 552c2d0b470SArd Biesheuvel struct setup_data *data; 553c2d0b470SArd Biesheuvel 554c2d0b470SArd Biesheuvel e820ext->type = SETUP_E820_EXT; 555c2d0b470SArd Biesheuvel e820ext->len = nr_entries * sizeof(struct boot_e820_entry); 556c2d0b470SArd Biesheuvel e820ext->next = 0; 557c2d0b470SArd Biesheuvel 558c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)params->hdr.setup_data; 559c2d0b470SArd Biesheuvel 560c2d0b470SArd Biesheuvel while (data && data->next) 561c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)data->next; 562c2d0b470SArd Biesheuvel 563c2d0b470SArd Biesheuvel if (data) 564c2d0b470SArd Biesheuvel data->next = (unsigned long)e820ext; 565c2d0b470SArd Biesheuvel else 566c2d0b470SArd Biesheuvel params->hdr.setup_data = (unsigned long)e820ext; 567c2d0b470SArd Biesheuvel } 568c2d0b470SArd Biesheuvel 569c2d0b470SArd Biesheuvel static efi_status_t 570c2d0b470SArd Biesheuvel setup_e820(struct boot_params *params, struct setup_data *e820ext, u32 e820ext_size) 571c2d0b470SArd Biesheuvel { 572c2d0b470SArd Biesheuvel struct boot_e820_entry *entry = params->e820_table; 573c2d0b470SArd Biesheuvel struct efi_info *efi = ¶ms->efi_info; 574c2d0b470SArd Biesheuvel struct boot_e820_entry *prev = NULL; 575c2d0b470SArd Biesheuvel u32 nr_entries; 576c2d0b470SArd Biesheuvel u32 nr_desc; 577c2d0b470SArd Biesheuvel int i; 578c2d0b470SArd Biesheuvel 579c2d0b470SArd Biesheuvel nr_entries = 0; 580c2d0b470SArd Biesheuvel nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size; 581c2d0b470SArd Biesheuvel 582c2d0b470SArd Biesheuvel for (i = 0; i < nr_desc; i++) { 583c2d0b470SArd Biesheuvel efi_memory_desc_t *d; 584c2d0b470SArd Biesheuvel unsigned int e820_type = 0; 585c2d0b470SArd Biesheuvel unsigned long m = efi->efi_memmap; 586c2d0b470SArd Biesheuvel 587c2d0b470SArd Biesheuvel #ifdef CONFIG_X86_64 588c2d0b470SArd Biesheuvel m |= (u64)efi->efi_memmap_hi << 32; 589c2d0b470SArd Biesheuvel #endif 590c2d0b470SArd Biesheuvel 591c2d0b470SArd Biesheuvel d = efi_early_memdesc_ptr(m, efi->efi_memdesc_size, i); 592c2d0b470SArd Biesheuvel switch (d->type) { 593c2d0b470SArd Biesheuvel case EFI_RESERVED_TYPE: 594c2d0b470SArd Biesheuvel case EFI_RUNTIME_SERVICES_CODE: 595c2d0b470SArd Biesheuvel case EFI_RUNTIME_SERVICES_DATA: 596c2d0b470SArd Biesheuvel case EFI_MEMORY_MAPPED_IO: 597c2d0b470SArd Biesheuvel case EFI_MEMORY_MAPPED_IO_PORT_SPACE: 598c2d0b470SArd Biesheuvel case EFI_PAL_CODE: 599c2d0b470SArd Biesheuvel e820_type = E820_TYPE_RESERVED; 600c2d0b470SArd Biesheuvel break; 601c2d0b470SArd Biesheuvel 602c2d0b470SArd Biesheuvel case EFI_UNUSABLE_MEMORY: 603c2d0b470SArd Biesheuvel e820_type = E820_TYPE_UNUSABLE; 604c2d0b470SArd Biesheuvel break; 605c2d0b470SArd Biesheuvel 606c2d0b470SArd Biesheuvel case EFI_ACPI_RECLAIM_MEMORY: 607c2d0b470SArd Biesheuvel e820_type = E820_TYPE_ACPI; 608c2d0b470SArd Biesheuvel break; 609c2d0b470SArd Biesheuvel 610c2d0b470SArd Biesheuvel case EFI_LOADER_CODE: 611c2d0b470SArd Biesheuvel case EFI_LOADER_DATA: 612c2d0b470SArd Biesheuvel case EFI_BOOT_SERVICES_CODE: 613c2d0b470SArd Biesheuvel case EFI_BOOT_SERVICES_DATA: 614c2d0b470SArd Biesheuvel case EFI_CONVENTIONAL_MEMORY: 615c2d0b470SArd Biesheuvel if (efi_soft_reserve_enabled() && 616c2d0b470SArd Biesheuvel (d->attribute & EFI_MEMORY_SP)) 617c2d0b470SArd Biesheuvel e820_type = E820_TYPE_SOFT_RESERVED; 618c2d0b470SArd Biesheuvel else 619c2d0b470SArd Biesheuvel e820_type = E820_TYPE_RAM; 620c2d0b470SArd Biesheuvel break; 621c2d0b470SArd Biesheuvel 622c2d0b470SArd Biesheuvel case EFI_ACPI_MEMORY_NVS: 623c2d0b470SArd Biesheuvel e820_type = E820_TYPE_NVS; 624c2d0b470SArd Biesheuvel break; 625c2d0b470SArd Biesheuvel 626c2d0b470SArd Biesheuvel case EFI_PERSISTENT_MEMORY: 627c2d0b470SArd Biesheuvel e820_type = E820_TYPE_PMEM; 628c2d0b470SArd Biesheuvel break; 629c2d0b470SArd Biesheuvel 630745e3ed8SKirill A. Shutemov case EFI_UNACCEPTED_MEMORY: 631745e3ed8SKirill A. Shutemov if (!IS_ENABLED(CONFIG_UNACCEPTED_MEMORY)) { 632745e3ed8SKirill A. Shutemov efi_warn_once( 633745e3ed8SKirill A. Shutemov "The system has unaccepted memory, but kernel does not support it\nConsider enabling CONFIG_UNACCEPTED_MEMORY\n"); 634745e3ed8SKirill A. Shutemov continue; 635745e3ed8SKirill A. Shutemov } 636745e3ed8SKirill A. Shutemov e820_type = E820_TYPE_RAM; 637745e3ed8SKirill A. Shutemov process_unaccepted_memory(d->phys_addr, 638745e3ed8SKirill A. Shutemov d->phys_addr + PAGE_SIZE * d->num_pages); 639745e3ed8SKirill A. Shutemov break; 640c2d0b470SArd Biesheuvel default: 641c2d0b470SArd Biesheuvel continue; 642c2d0b470SArd Biesheuvel } 643c2d0b470SArd Biesheuvel 644c2d0b470SArd Biesheuvel /* Merge adjacent mappings */ 645c2d0b470SArd Biesheuvel if (prev && prev->type == e820_type && 646c2d0b470SArd Biesheuvel (prev->addr + prev->size) == d->phys_addr) { 647c2d0b470SArd Biesheuvel prev->size += d->num_pages << 12; 648c2d0b470SArd Biesheuvel continue; 649c2d0b470SArd Biesheuvel } 650c2d0b470SArd Biesheuvel 651c2d0b470SArd Biesheuvel if (nr_entries == ARRAY_SIZE(params->e820_table)) { 652c2d0b470SArd Biesheuvel u32 need = (nr_desc - i) * sizeof(struct e820_entry) + 653c2d0b470SArd Biesheuvel sizeof(struct setup_data); 654c2d0b470SArd Biesheuvel 655c2d0b470SArd Biesheuvel if (!e820ext || e820ext_size < need) 656c2d0b470SArd Biesheuvel return EFI_BUFFER_TOO_SMALL; 657c2d0b470SArd Biesheuvel 658c2d0b470SArd Biesheuvel /* boot_params map full, switch to e820 extended */ 659c2d0b470SArd Biesheuvel entry = (struct boot_e820_entry *)e820ext->data; 660c2d0b470SArd Biesheuvel } 661c2d0b470SArd Biesheuvel 662c2d0b470SArd Biesheuvel entry->addr = d->phys_addr; 663c2d0b470SArd Biesheuvel entry->size = d->num_pages << PAGE_SHIFT; 664c2d0b470SArd Biesheuvel entry->type = e820_type; 665c2d0b470SArd Biesheuvel prev = entry++; 666c2d0b470SArd Biesheuvel nr_entries++; 667c2d0b470SArd Biesheuvel } 668c2d0b470SArd Biesheuvel 669c2d0b470SArd Biesheuvel if (nr_entries > ARRAY_SIZE(params->e820_table)) { 670c2d0b470SArd Biesheuvel u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_table); 671c2d0b470SArd Biesheuvel 672c2d0b470SArd Biesheuvel add_e820ext(params, e820ext, nr_e820ext); 673c2d0b470SArd Biesheuvel nr_entries -= nr_e820ext; 674c2d0b470SArd Biesheuvel } 675c2d0b470SArd Biesheuvel 676c2d0b470SArd Biesheuvel params->e820_entries = (u8)nr_entries; 677c2d0b470SArd Biesheuvel 678c2d0b470SArd Biesheuvel return EFI_SUCCESS; 679c2d0b470SArd Biesheuvel } 680c2d0b470SArd Biesheuvel 681c2d0b470SArd Biesheuvel static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext, 682c2d0b470SArd Biesheuvel u32 *e820ext_size) 683c2d0b470SArd Biesheuvel { 684c2d0b470SArd Biesheuvel efi_status_t status; 685c2d0b470SArd Biesheuvel unsigned long size; 686c2d0b470SArd Biesheuvel 687c2d0b470SArd Biesheuvel size = sizeof(struct setup_data) + 688c2d0b470SArd Biesheuvel sizeof(struct e820_entry) * nr_desc; 689c2d0b470SArd Biesheuvel 690c2d0b470SArd Biesheuvel if (*e820ext) { 691c2d0b470SArd Biesheuvel efi_bs_call(free_pool, *e820ext); 692c2d0b470SArd Biesheuvel *e820ext = NULL; 693c2d0b470SArd Biesheuvel *e820ext_size = 0; 694c2d0b470SArd Biesheuvel } 695c2d0b470SArd Biesheuvel 696c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 697c2d0b470SArd Biesheuvel (void **)e820ext); 698c2d0b470SArd Biesheuvel if (status == EFI_SUCCESS) 699c2d0b470SArd Biesheuvel *e820ext_size = size; 700c2d0b470SArd Biesheuvel 701c2d0b470SArd Biesheuvel return status; 702c2d0b470SArd Biesheuvel } 703c2d0b470SArd Biesheuvel 704c2d0b470SArd Biesheuvel static efi_status_t allocate_e820(struct boot_params *params, 705c2d0b470SArd Biesheuvel struct setup_data **e820ext, 706c2d0b470SArd Biesheuvel u32 *e820ext_size) 707c2d0b470SArd Biesheuvel { 7082e9f46eeSKirill A. Shutemov struct efi_boot_memmap *map; 709c2d0b470SArd Biesheuvel efi_status_t status; 7102e9f46eeSKirill A. Shutemov __u32 nr_desc; 711c2d0b470SArd Biesheuvel 7122e9f46eeSKirill A. Shutemov status = efi_get_memory_map(&map, false); 713c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 714c2d0b470SArd Biesheuvel return status; 7152e9f46eeSKirill A. Shutemov 7162e9f46eeSKirill A. Shutemov nr_desc = map->map_size / map->desc_size; 7172e9f46eeSKirill A. Shutemov if (nr_desc > ARRAY_SIZE(params->e820_table) - EFI_MMAP_NR_SLACK_SLOTS) { 7182e9f46eeSKirill A. Shutemov u32 nr_e820ext = nr_desc - ARRAY_SIZE(params->e820_table) + 7192e9f46eeSKirill A. Shutemov EFI_MMAP_NR_SLACK_SLOTS; 7202e9f46eeSKirill A. Shutemov 7212e9f46eeSKirill A. Shutemov status = alloc_e820ext(nr_e820ext, e820ext, e820ext_size); 722c2d0b470SArd Biesheuvel } 723c2d0b470SArd Biesheuvel 724745e3ed8SKirill A. Shutemov if (IS_ENABLED(CONFIG_UNACCEPTED_MEMORY) && status == EFI_SUCCESS) 725745e3ed8SKirill A. Shutemov status = allocate_unaccepted_bitmap(nr_desc, map); 726745e3ed8SKirill A. Shutemov 7272e9f46eeSKirill A. Shutemov efi_bs_call(free_pool, map); 7282e9f46eeSKirill A. Shutemov return status; 729c2d0b470SArd Biesheuvel } 730c2d0b470SArd Biesheuvel 731c2d0b470SArd Biesheuvel struct exit_boot_struct { 732c2d0b470SArd Biesheuvel struct boot_params *boot_params; 733c2d0b470SArd Biesheuvel struct efi_info *efi; 734c2d0b470SArd Biesheuvel }; 735c2d0b470SArd Biesheuvel 736c2d0b470SArd Biesheuvel static efi_status_t exit_boot_func(struct efi_boot_memmap *map, 737c2d0b470SArd Biesheuvel void *priv) 738c2d0b470SArd Biesheuvel { 739c2d0b470SArd Biesheuvel const char *signature; 740c2d0b470SArd Biesheuvel struct exit_boot_struct *p = priv; 741c2d0b470SArd Biesheuvel 742c2d0b470SArd Biesheuvel signature = efi_is_64bit() ? EFI64_LOADER_SIGNATURE 743c2d0b470SArd Biesheuvel : EFI32_LOADER_SIGNATURE; 744c2d0b470SArd Biesheuvel memcpy(&p->efi->efi_loader_signature, signature, sizeof(__u32)); 745c2d0b470SArd Biesheuvel 746eed4e019SArvind Sankar efi_set_u64_split((unsigned long)efi_system_table, 747eed4e019SArvind Sankar &p->efi->efi_systab, &p->efi->efi_systab_hi); 748eab31265SArd Biesheuvel p->efi->efi_memdesc_size = map->desc_size; 749eab31265SArd Biesheuvel p->efi->efi_memdesc_version = map->desc_ver; 750eab31265SArd Biesheuvel efi_set_u64_split((unsigned long)map->map, 751eed4e019SArvind Sankar &p->efi->efi_memmap, &p->efi->efi_memmap_hi); 752eab31265SArd Biesheuvel p->efi->efi_memmap_size = map->map_size; 753c2d0b470SArd Biesheuvel 754c2d0b470SArd Biesheuvel return EFI_SUCCESS; 755c2d0b470SArd Biesheuvel } 756c2d0b470SArd Biesheuvel 757c2d0b470SArd Biesheuvel static efi_status_t exit_boot(struct boot_params *boot_params, void *handle) 758c2d0b470SArd Biesheuvel { 759c2d0b470SArd Biesheuvel struct setup_data *e820ext = NULL; 760c2d0b470SArd Biesheuvel __u32 e820ext_size = 0; 761c2d0b470SArd Biesheuvel efi_status_t status; 762c2d0b470SArd Biesheuvel struct exit_boot_struct priv; 763c2d0b470SArd Biesheuvel 764c2d0b470SArd Biesheuvel priv.boot_params = boot_params; 765c2d0b470SArd Biesheuvel priv.efi = &boot_params->efi_info; 766c2d0b470SArd Biesheuvel 767c2d0b470SArd Biesheuvel status = allocate_e820(boot_params, &e820ext, &e820ext_size); 768c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 769c2d0b470SArd Biesheuvel return status; 770c2d0b470SArd Biesheuvel 771c2d0b470SArd Biesheuvel /* Might as well exit boot services now */ 772eab31265SArd Biesheuvel status = efi_exit_boot_services(handle, &priv, exit_boot_func); 773c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 774c2d0b470SArd Biesheuvel return status; 775c2d0b470SArd Biesheuvel 776c2d0b470SArd Biesheuvel /* Historic? */ 777c2d0b470SArd Biesheuvel boot_params->alt_mem_k = 32 * 1024; 778c2d0b470SArd Biesheuvel 779c2d0b470SArd Biesheuvel status = setup_e820(boot_params, e820ext, e820ext_size); 780c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 781c2d0b470SArd Biesheuvel return status; 782c2d0b470SArd Biesheuvel 783c2d0b470SArd Biesheuvel return EFI_SUCCESS; 784c2d0b470SArd Biesheuvel } 785c2d0b470SArd Biesheuvel 786d2d7a54fSArd Biesheuvel static void __noreturn enter_kernel(unsigned long kernel_addr, 787d2d7a54fSArd Biesheuvel struct boot_params *boot_params) 788d2d7a54fSArd Biesheuvel { 789d2d7a54fSArd Biesheuvel /* enter decompressed kernel with boot_params pointer in RSI/ESI */ 790d2d7a54fSArd Biesheuvel asm("jmp *%0"::"r"(kernel_addr), "S"(boot_params)); 791d2d7a54fSArd Biesheuvel 792d2d7a54fSArd Biesheuvel unreachable(); 793d2d7a54fSArd Biesheuvel } 794d2d7a54fSArd Biesheuvel 795c2d0b470SArd Biesheuvel /* 796d2d7a54fSArd Biesheuvel * On success, this routine will jump to the relocated image directly and never 797d2d7a54fSArd Biesheuvel * return. On failure, it will exit to the firmware via efi_exit() instead of 798d2d7a54fSArd Biesheuvel * returning. 799c2d0b470SArd Biesheuvel */ 800df9215f1SArd Biesheuvel void __noreturn efi_stub_entry(efi_handle_t handle, 801c2d0b470SArd Biesheuvel efi_system_table_t *sys_table_arg, 802c2d0b470SArd Biesheuvel struct boot_params *boot_params) 803c2d0b470SArd Biesheuvel { 804c2d0b470SArd Biesheuvel unsigned long bzimage_addr = (unsigned long)startup_32; 805d5cdf4cfSArvind Sankar unsigned long buffer_start, buffer_end; 806c2d0b470SArd Biesheuvel struct setup_header *hdr = &boot_params->hdr; 807f4dc7fffSArd Biesheuvel const struct linux_efi_initrd *initrd = NULL; 808c2d0b470SArd Biesheuvel efi_status_t status; 809c2d0b470SArd Biesheuvel 810ccc27ae7SArd Biesheuvel efi_system_table = sys_table_arg; 811c2d0b470SArd Biesheuvel /* Check if we were booted by the EFI firmware */ 812ccc27ae7SArd Biesheuvel if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) 8133b8f44fcSArd Biesheuvel efi_exit(handle, EFI_INVALID_PARAMETER); 814c2d0b470SArd Biesheuvel 8153ba75c13SBaskov Evgeniy efi_dxe_table = get_efi_config_table(EFI_DXE_SERVICES_TABLE_GUID); 8163ba75c13SBaskov Evgeniy if (efi_dxe_table && 8173ba75c13SBaskov Evgeniy efi_dxe_table->hdr.signature != EFI_DXE_SERVICES_TABLE_SIGNATURE) { 8183ba75c13SBaskov Evgeniy efi_warn("Ignoring DXE services table: invalid signature\n"); 8193ba75c13SBaskov Evgeniy efi_dxe_table = NULL; 8203ba75c13SBaskov Evgeniy } 8213ba75c13SBaskov Evgeniy 822*cb1c9e02SArd Biesheuvel status = efi_setup_5level_paging(); 823*cb1c9e02SArd Biesheuvel if (status != EFI_SUCCESS) { 824*cb1c9e02SArd Biesheuvel efi_err("efi_setup_5level_paging() failed!\n"); 825*cb1c9e02SArd Biesheuvel goto fail; 826*cb1c9e02SArd Biesheuvel } 827*cb1c9e02SArd Biesheuvel 828c2d0b470SArd Biesheuvel /* 829d5cdf4cfSArvind Sankar * If the kernel isn't already loaded at a suitable address, 830d5cdf4cfSArvind Sankar * relocate it. 831d5cdf4cfSArvind Sankar * 832d5cdf4cfSArvind Sankar * It must be loaded above LOAD_PHYSICAL_ADDR. 833d5cdf4cfSArvind Sankar * 834d5cdf4cfSArvind Sankar * The maximum address for 64-bit is 1 << 46 for 4-level paging. This 835d5cdf4cfSArvind Sankar * is defined as the macro MAXMEM, but unfortunately that is not a 836d5cdf4cfSArvind Sankar * compile-time constant if 5-level paging is configured, so we instead 837d5cdf4cfSArvind Sankar * define our own macro for use here. 838d5cdf4cfSArvind Sankar * 839d5cdf4cfSArvind Sankar * For 32-bit, the maximum address is complicated to figure out, for 840d5cdf4cfSArvind Sankar * now use KERNEL_IMAGE_SIZE, which will be 512MiB, the same as what 841d5cdf4cfSArvind Sankar * KASLR uses. 842d5cdf4cfSArvind Sankar * 84321cb9b41SArvind Sankar * Also relocate it if image_offset is zero, i.e. the kernel wasn't 84421cb9b41SArvind Sankar * loaded by LoadImage, but rather by a bootloader that called the 84521cb9b41SArvind Sankar * handover entry. The reason we must always relocate in this case is 84621cb9b41SArvind Sankar * to handle the case of systemd-boot booting a unified kernel image, 84721cb9b41SArvind Sankar * which is a PE executable that contains the bzImage and an initrd as 84821cb9b41SArvind Sankar * COFF sections. The initrd section is placed after the bzImage 84921cb9b41SArvind Sankar * without ensuring that there are at least init_size bytes available 85021cb9b41SArvind Sankar * for the bzImage, and thus the compressed kernel's startup code may 85121cb9b41SArvind Sankar * overwrite the initrd unless it is moved out of the way. 852c2d0b470SArd Biesheuvel */ 853d5cdf4cfSArvind Sankar 854d5cdf4cfSArvind Sankar buffer_start = ALIGN(bzimage_addr - image_offset, 855d5cdf4cfSArvind Sankar hdr->kernel_alignment); 856d5cdf4cfSArvind Sankar buffer_end = buffer_start + hdr->init_size; 857d5cdf4cfSArvind Sankar 858d5cdf4cfSArvind Sankar if ((buffer_start < LOAD_PHYSICAL_ADDR) || 859d5cdf4cfSArvind Sankar (IS_ENABLED(CONFIG_X86_32) && buffer_end > KERNEL_IMAGE_SIZE) || 860d5cdf4cfSArvind Sankar (IS_ENABLED(CONFIG_X86_64) && buffer_end > MAXMEM_X86_64_4LEVEL) || 86121cb9b41SArvind Sankar (image_offset == 0)) { 862688eb282SArvind Sankar extern char _bss[]; 863688eb282SArvind Sankar 864c2d0b470SArd Biesheuvel status = efi_relocate_kernel(&bzimage_addr, 865688eb282SArvind Sankar (unsigned long)_bss - bzimage_addr, 866688eb282SArvind Sankar hdr->init_size, 867c2d0b470SArd Biesheuvel hdr->pref_address, 868c2d0b470SArd Biesheuvel hdr->kernel_alignment, 869c2d0b470SArd Biesheuvel LOAD_PHYSICAL_ADDR); 870c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 87136bdd0a7SArvind Sankar efi_err("efi_relocate_kernel() failed!\n"); 872c2d0b470SArd Biesheuvel goto fail; 873c2d0b470SArd Biesheuvel } 8741887c9b6SArvind Sankar /* 8751887c9b6SArvind Sankar * Now that we've copied the kernel elsewhere, we no longer 8761887c9b6SArvind Sankar * have a set up block before startup_32(), so reset image_offset 8771887c9b6SArvind Sankar * to zero in case it was set earlier. 8781887c9b6SArvind Sankar */ 8791887c9b6SArvind Sankar image_offset = 0; 880c2d0b470SArd Biesheuvel } 881c2d0b470SArd Biesheuvel 8827dde67f2SArvind Sankar #ifdef CONFIG_CMDLINE_BOOL 883055042beSArvind Sankar status = efi_parse_options(CONFIG_CMDLINE); 884055042beSArvind Sankar if (status != EFI_SUCCESS) { 885055042beSArvind Sankar efi_err("Failed to parse options\n"); 886055042beSArvind Sankar goto fail; 887055042beSArvind Sankar } 8887dde67f2SArvind Sankar #endif 8897dde67f2SArvind Sankar if (!IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) { 8907dde67f2SArvind Sankar unsigned long cmdline_paddr = ((u64)hdr->cmd_line_ptr | 891c2d0b470SArd Biesheuvel ((u64)boot_params->ext_cmd_line_ptr << 32)); 892055042beSArvind Sankar status = efi_parse_options((char *)cmdline_paddr); 893055042beSArvind Sankar if (status != EFI_SUCCESS) { 894055042beSArvind Sankar efi_err("Failed to parse options\n"); 895055042beSArvind Sankar goto fail; 896055042beSArvind Sankar } 8977dde67f2SArvind Sankar } 898c2d0b470SArd Biesheuvel 899c2d0b470SArd Biesheuvel /* 900987053a3SArvind Sankar * At this point, an initrd may already have been loaded by the 901987053a3SArvind Sankar * bootloader and passed via bootparams. We permit an initrd loaded 902987053a3SArvind Sankar * from the LINUX_EFI_INITRD_MEDIA_GUID device path to supersede it. 903987053a3SArvind Sankar * 904987053a3SArvind Sankar * If the device path is not present, any command-line initrd= 905987053a3SArvind Sankar * arguments will be processed only if image is not NULL, which will be 906987053a3SArvind Sankar * the case only if we were loaded via the PE entry point. 907ec93fc37SArd Biesheuvel */ 908f4dc7fffSArd Biesheuvel status = efi_load_initrd(image, hdr->initrd_addr_max, ULONG_MAX, 909f4dc7fffSArd Biesheuvel &initrd); 91020287d56SArd Biesheuvel if (status != EFI_SUCCESS) 911ec93fc37SArd Biesheuvel goto fail; 912f4dc7fffSArd Biesheuvel if (initrd && initrd->size > 0) { 913f4dc7fffSArd Biesheuvel efi_set_u64_split(initrd->base, &hdr->ramdisk_image, 914eed4e019SArvind Sankar &boot_params->ext_ramdisk_image); 915f4dc7fffSArd Biesheuvel efi_set_u64_split(initrd->size, &hdr->ramdisk_size, 916eed4e019SArvind Sankar &boot_params->ext_ramdisk_size); 91779d3219dSArd Biesheuvel } 918ec93fc37SArd Biesheuvel 919f4dc7fffSArd Biesheuvel 920ec93fc37SArd Biesheuvel /* 921c2d0b470SArd Biesheuvel * If the boot loader gave us a value for secure_boot then we use that, 922c2d0b470SArd Biesheuvel * otherwise we ask the BIOS. 923c2d0b470SArd Biesheuvel */ 924c2d0b470SArd Biesheuvel if (boot_params->secure_boot == efi_secureboot_mode_unset) 925c2d0b470SArd Biesheuvel boot_params->secure_boot = efi_get_secureboot(); 926c2d0b470SArd Biesheuvel 927c2d0b470SArd Biesheuvel /* Ask the firmware to clear memory on unclean shutdown */ 928c2d0b470SArd Biesheuvel efi_enable_reset_attack_mitigation(); 929c2d0b470SArd Biesheuvel 930c2d0b470SArd Biesheuvel efi_random_get_seed(); 931c2d0b470SArd Biesheuvel 932c2d0b470SArd Biesheuvel efi_retrieve_tpm2_eventlog(); 933c2d0b470SArd Biesheuvel 934c2d0b470SArd Biesheuvel setup_graphics(boot_params); 935c2d0b470SArd Biesheuvel 936c2d0b470SArd Biesheuvel setup_efi_pci(boot_params); 937c2d0b470SArd Biesheuvel 93882e0d6d7SBaskov Evgeniy setup_quirks(boot_params, bzimage_addr, buffer_end - buffer_start); 939c2d0b470SArd Biesheuvel 940c0461bd1SDionna Glaze setup_unaccepted_memory(); 941c0461bd1SDionna Glaze 942c2d0b470SArd Biesheuvel status = exit_boot(boot_params, handle); 943c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 94436bdd0a7SArvind Sankar efi_err("exit_boot() failed!\n"); 945c2d0b470SArd Biesheuvel goto fail; 946c2d0b470SArd Biesheuvel } 947c2d0b470SArd Biesheuvel 948*cb1c9e02SArd Biesheuvel efi_5level_switch(); 949*cb1c9e02SArd Biesheuvel 950d2d7a54fSArd Biesheuvel if (IS_ENABLED(CONFIG_X86_64)) 951d2d7a54fSArd Biesheuvel bzimage_addr += startup_64 - startup_32; 952d2d7a54fSArd Biesheuvel 953d2d7a54fSArd Biesheuvel enter_kernel(bzimage_addr, boot_params); 954c2d0b470SArd Biesheuvel fail: 955df9215f1SArd Biesheuvel efi_err("efi_stub_entry() failed!\n"); 956c2d0b470SArd Biesheuvel 9573b8f44fcSArd Biesheuvel efi_exit(handle, status); 958c2d0b470SArd Biesheuvel } 959df9215f1SArd Biesheuvel 960df9215f1SArd Biesheuvel #ifdef CONFIG_EFI_HANDOVER_PROTOCOL 961d7156b98SArd Biesheuvel void efi_handover_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg, 962d7156b98SArd Biesheuvel struct boot_params *boot_params) 963d7156b98SArd Biesheuvel { 964d7156b98SArd Biesheuvel extern char _bss[], _ebss[]; 965d7156b98SArd Biesheuvel 966d7156b98SArd Biesheuvel memset(_bss, 0, _ebss - _bss); 967d7156b98SArd Biesheuvel efi_stub_entry(handle, sys_table_arg, boot_params); 968d7156b98SArd Biesheuvel } 969d7156b98SArd Biesheuvel 970df9215f1SArd Biesheuvel #ifndef CONFIG_EFI_MIXED 971d7156b98SArd Biesheuvel extern __alias(efi_handover_entry) 972df9215f1SArd Biesheuvel void efi32_stub_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg, 973df9215f1SArd Biesheuvel struct boot_params *boot_params); 974df9215f1SArd Biesheuvel 975d7156b98SArd Biesheuvel extern __alias(efi_handover_entry) 976df9215f1SArd Biesheuvel void efi64_stub_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg, 977df9215f1SArd Biesheuvel struct boot_params *boot_params); 978df9215f1SArd Biesheuvel #endif 979df9215f1SArd Biesheuvel #endif 980