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" 20c2d0b470SArd Biesheuvel 21d5cdf4cfSArvind Sankar /* Maximum physical address for 64-bit kernel with 4-level paging */ 22d5cdf4cfSArvind Sankar #define MAXMEM_X86_64_4LEVEL (1ull << 46) 23d5cdf4cfSArvind Sankar 24ccc27ae7SArd Biesheuvel const efi_system_table_t *efi_system_table; 253ba75c13SBaskov Evgeniy const efi_dxe_services_table_t *efi_dxe_table; 264b520162SArd Biesheuvel u32 image_offset __section(".data"); 27987053a3SArvind Sankar static efi_loaded_image_t *image = NULL; 28c2d0b470SArd Biesheuvel 29c0461bd1SDionna Glaze typedef union sev_memory_acceptance_protocol sev_memory_acceptance_protocol_t; 30c0461bd1SDionna Glaze union sev_memory_acceptance_protocol { 31c0461bd1SDionna Glaze struct { 32c0461bd1SDionna Glaze efi_status_t (__efiapi * allow_unaccepted_memory)( 33c0461bd1SDionna Glaze sev_memory_acceptance_protocol_t *); 34c0461bd1SDionna Glaze }; 35c0461bd1SDionna Glaze struct { 36c0461bd1SDionna Glaze u32 allow_unaccepted_memory; 37c0461bd1SDionna Glaze } mixed_mode; 38c0461bd1SDionna Glaze }; 39c0461bd1SDionna Glaze 40c2d0b470SArd Biesheuvel static efi_status_t 41c2d0b470SArd Biesheuvel preserve_pci_rom_image(efi_pci_io_protocol_t *pci, struct pci_setup_rom **__rom) 42c2d0b470SArd Biesheuvel { 43c2d0b470SArd Biesheuvel struct pci_setup_rom *rom = NULL; 44c2d0b470SArd Biesheuvel efi_status_t status; 45c2d0b470SArd Biesheuvel unsigned long size; 46c2d0b470SArd Biesheuvel uint64_t romsize; 47c2d0b470SArd Biesheuvel void *romimage; 48c2d0b470SArd Biesheuvel 49c2d0b470SArd Biesheuvel /* 50c2d0b470SArd Biesheuvel * Some firmware images contain EFI function pointers at the place where 51c2d0b470SArd Biesheuvel * the romimage and romsize fields are supposed to be. Typically the EFI 52c2d0b470SArd Biesheuvel * code is mapped at high addresses, translating to an unrealistically 53c2d0b470SArd Biesheuvel * large romsize. The UEFI spec limits the size of option ROMs to 16 54c2d0b470SArd Biesheuvel * MiB so we reject any ROMs over 16 MiB in size to catch this. 55c2d0b470SArd Biesheuvel */ 56c2d0b470SArd Biesheuvel romimage = efi_table_attr(pci, romimage); 57c2d0b470SArd Biesheuvel romsize = efi_table_attr(pci, romsize); 58c2d0b470SArd Biesheuvel if (!romimage || !romsize || romsize > SZ_16M) 59c2d0b470SArd Biesheuvel return EFI_INVALID_PARAMETER; 60c2d0b470SArd Biesheuvel 61c2d0b470SArd Biesheuvel size = romsize + sizeof(*rom); 62c2d0b470SArd Biesheuvel 63c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 64c2d0b470SArd Biesheuvel (void **)&rom); 65c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 6636bdd0a7SArvind Sankar efi_err("Failed to allocate memory for 'rom'\n"); 67c2d0b470SArd Biesheuvel return status; 68c2d0b470SArd Biesheuvel } 69c2d0b470SArd Biesheuvel 70c2d0b470SArd Biesheuvel memset(rom, 0, sizeof(*rom)); 71c2d0b470SArd Biesheuvel 72c2d0b470SArd Biesheuvel rom->data.type = SETUP_PCI; 73c2d0b470SArd Biesheuvel rom->data.len = size - sizeof(struct setup_data); 74c2d0b470SArd Biesheuvel rom->data.next = 0; 75c2d0b470SArd Biesheuvel rom->pcilen = pci->romsize; 76c2d0b470SArd Biesheuvel *__rom = rom; 77c2d0b470SArd Biesheuvel 78c2d0b470SArd Biesheuvel status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16, 79c2d0b470SArd Biesheuvel PCI_VENDOR_ID, 1, &rom->vendor); 80c2d0b470SArd Biesheuvel 81c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 8236bdd0a7SArvind Sankar efi_err("Failed to read rom->vendor\n"); 83c2d0b470SArd Biesheuvel goto free_struct; 84c2d0b470SArd Biesheuvel } 85c2d0b470SArd Biesheuvel 86c2d0b470SArd Biesheuvel status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16, 87c2d0b470SArd Biesheuvel PCI_DEVICE_ID, 1, &rom->devid); 88c2d0b470SArd Biesheuvel 89c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 9036bdd0a7SArvind Sankar efi_err("Failed to read rom->devid\n"); 91c2d0b470SArd Biesheuvel goto free_struct; 92c2d0b470SArd Biesheuvel } 93c2d0b470SArd Biesheuvel 94c2d0b470SArd Biesheuvel status = efi_call_proto(pci, get_location, &rom->segment, &rom->bus, 95c2d0b470SArd Biesheuvel &rom->device, &rom->function); 96c2d0b470SArd Biesheuvel 97c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 98c2d0b470SArd Biesheuvel goto free_struct; 99c2d0b470SArd Biesheuvel 100c2d0b470SArd Biesheuvel memcpy(rom->romdata, romimage, romsize); 101c2d0b470SArd Biesheuvel return status; 102c2d0b470SArd Biesheuvel 103c2d0b470SArd Biesheuvel free_struct: 104c2d0b470SArd Biesheuvel efi_bs_call(free_pool, rom); 105c2d0b470SArd Biesheuvel return status; 106c2d0b470SArd Biesheuvel } 107c2d0b470SArd Biesheuvel 108c2d0b470SArd Biesheuvel /* 109c2d0b470SArd Biesheuvel * There's no way to return an informative status from this function, 110c2d0b470SArd Biesheuvel * because any analysis (and printing of error messages) needs to be 111c2d0b470SArd Biesheuvel * done directly at the EFI function call-site. 112c2d0b470SArd Biesheuvel * 113c2d0b470SArd Biesheuvel * For example, EFI_INVALID_PARAMETER could indicate a bug or maybe we 114c2d0b470SArd Biesheuvel * just didn't find any PCI devices, but there's no way to tell outside 115c2d0b470SArd Biesheuvel * the context of the call. 116c2d0b470SArd Biesheuvel */ 117c2d0b470SArd Biesheuvel static void setup_efi_pci(struct boot_params *params) 118c2d0b470SArd Biesheuvel { 119c2d0b470SArd Biesheuvel efi_status_t status; 120c2d0b470SArd Biesheuvel void **pci_handle = NULL; 121c2d0b470SArd Biesheuvel efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID; 122c2d0b470SArd Biesheuvel unsigned long size = 0; 123c2d0b470SArd Biesheuvel struct setup_data *data; 124c2d0b470SArd Biesheuvel efi_handle_t h; 125c2d0b470SArd Biesheuvel int i; 126c2d0b470SArd Biesheuvel 127c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 128c2d0b470SArd Biesheuvel &pci_proto, NULL, &size, pci_handle); 129c2d0b470SArd Biesheuvel 130c2d0b470SArd Biesheuvel if (status == EFI_BUFFER_TOO_SMALL) { 131c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 132c2d0b470SArd Biesheuvel (void **)&pci_handle); 133c2d0b470SArd Biesheuvel 134c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 13536bdd0a7SArvind Sankar efi_err("Failed to allocate memory for 'pci_handle'\n"); 136c2d0b470SArd Biesheuvel return; 137c2d0b470SArd Biesheuvel } 138c2d0b470SArd Biesheuvel 139c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 140c2d0b470SArd Biesheuvel &pci_proto, NULL, &size, pci_handle); 141c2d0b470SArd Biesheuvel } 142c2d0b470SArd Biesheuvel 143c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 144c2d0b470SArd Biesheuvel goto free_handle; 145c2d0b470SArd Biesheuvel 146c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)params->hdr.setup_data; 147c2d0b470SArd Biesheuvel 148c2d0b470SArd Biesheuvel while (data && data->next) 149c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)data->next; 150c2d0b470SArd Biesheuvel 151c2d0b470SArd Biesheuvel for_each_efi_handle(h, pci_handle, size, i) { 152c2d0b470SArd Biesheuvel efi_pci_io_protocol_t *pci = NULL; 153c2d0b470SArd Biesheuvel struct pci_setup_rom *rom; 154c2d0b470SArd Biesheuvel 155c2d0b470SArd Biesheuvel status = efi_bs_call(handle_protocol, h, &pci_proto, 156c2d0b470SArd Biesheuvel (void **)&pci); 157c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS || !pci) 158c2d0b470SArd Biesheuvel continue; 159c2d0b470SArd Biesheuvel 160c2d0b470SArd Biesheuvel status = preserve_pci_rom_image(pci, &rom); 161c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 162c2d0b470SArd Biesheuvel continue; 163c2d0b470SArd Biesheuvel 164c2d0b470SArd Biesheuvel if (data) 165c2d0b470SArd Biesheuvel data->next = (unsigned long)rom; 166c2d0b470SArd Biesheuvel else 167c2d0b470SArd Biesheuvel params->hdr.setup_data = (unsigned long)rom; 168c2d0b470SArd Biesheuvel 169c2d0b470SArd Biesheuvel data = (struct setup_data *)rom; 170c2d0b470SArd Biesheuvel } 171c2d0b470SArd Biesheuvel 172c2d0b470SArd Biesheuvel free_handle: 173c2d0b470SArd Biesheuvel efi_bs_call(free_pool, pci_handle); 174c2d0b470SArd Biesheuvel } 175c2d0b470SArd Biesheuvel 176c2d0b470SArd Biesheuvel static void retrieve_apple_device_properties(struct boot_params *boot_params) 177c2d0b470SArd Biesheuvel { 178c2d0b470SArd Biesheuvel efi_guid_t guid = APPLE_PROPERTIES_PROTOCOL_GUID; 179c2d0b470SArd Biesheuvel struct setup_data *data, *new; 180c2d0b470SArd Biesheuvel efi_status_t status; 181c2d0b470SArd Biesheuvel u32 size = 0; 182c2d0b470SArd Biesheuvel apple_properties_protocol_t *p; 183c2d0b470SArd Biesheuvel 184c2d0b470SArd Biesheuvel status = efi_bs_call(locate_protocol, &guid, NULL, (void **)&p); 185c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 186c2d0b470SArd Biesheuvel return; 187c2d0b470SArd Biesheuvel 188c2d0b470SArd Biesheuvel if (efi_table_attr(p, version) != 0x10000) { 18936bdd0a7SArvind Sankar efi_err("Unsupported properties proto version\n"); 190c2d0b470SArd Biesheuvel return; 191c2d0b470SArd Biesheuvel } 192c2d0b470SArd Biesheuvel 193c2d0b470SArd Biesheuvel efi_call_proto(p, get_all, NULL, &size); 194c2d0b470SArd Biesheuvel if (!size) 195c2d0b470SArd Biesheuvel return; 196c2d0b470SArd Biesheuvel 197c2d0b470SArd Biesheuvel do { 198c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, 199c2d0b470SArd Biesheuvel size + sizeof(struct setup_data), 200c2d0b470SArd Biesheuvel (void **)&new); 201c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 20236bdd0a7SArvind Sankar efi_err("Failed to allocate memory for 'properties'\n"); 203c2d0b470SArd Biesheuvel return; 204c2d0b470SArd Biesheuvel } 205c2d0b470SArd Biesheuvel 206c2d0b470SArd Biesheuvel status = efi_call_proto(p, get_all, new->data, &size); 207c2d0b470SArd Biesheuvel 208c2d0b470SArd Biesheuvel if (status == EFI_BUFFER_TOO_SMALL) 209c2d0b470SArd Biesheuvel efi_bs_call(free_pool, new); 210c2d0b470SArd Biesheuvel } while (status == EFI_BUFFER_TOO_SMALL); 211c2d0b470SArd Biesheuvel 212c2d0b470SArd Biesheuvel new->type = SETUP_APPLE_PROPERTIES; 213c2d0b470SArd Biesheuvel new->len = size; 214c2d0b470SArd Biesheuvel new->next = 0; 215c2d0b470SArd Biesheuvel 216c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)boot_params->hdr.setup_data; 217c2d0b470SArd Biesheuvel if (!data) { 218c2d0b470SArd Biesheuvel boot_params->hdr.setup_data = (unsigned long)new; 219c2d0b470SArd Biesheuvel } else { 220c2d0b470SArd Biesheuvel while (data->next) 221c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)data->next; 222c2d0b470SArd Biesheuvel data->next = (unsigned long)new; 223c2d0b470SArd Biesheuvel } 224c2d0b470SArd Biesheuvel } 225c2d0b470SArd Biesheuvel 22682e0d6d7SBaskov Evgeniy static void 22782e0d6d7SBaskov Evgeniy adjust_memory_range_protection(unsigned long start, unsigned long size) 22882e0d6d7SBaskov Evgeniy { 22982e0d6d7SBaskov Evgeniy efi_status_t status; 23082e0d6d7SBaskov Evgeniy efi_gcd_memory_space_desc_t desc; 23182e0d6d7SBaskov Evgeniy unsigned long end, next; 23282e0d6d7SBaskov Evgeniy unsigned long rounded_start, rounded_end; 23382e0d6d7SBaskov Evgeniy unsigned long unprotect_start, unprotect_size; 23482e0d6d7SBaskov Evgeniy 23582e0d6d7SBaskov Evgeniy if (efi_dxe_table == NULL) 23682e0d6d7SBaskov Evgeniy return; 23782e0d6d7SBaskov Evgeniy 23882e0d6d7SBaskov Evgeniy rounded_start = rounddown(start, EFI_PAGE_SIZE); 23982e0d6d7SBaskov Evgeniy rounded_end = roundup(start + size, EFI_PAGE_SIZE); 24082e0d6d7SBaskov Evgeniy 24182e0d6d7SBaskov Evgeniy /* 24282e0d6d7SBaskov Evgeniy * Don't modify memory region attributes, they are 24382e0d6d7SBaskov Evgeniy * already suitable, to lower the possibility to 24482e0d6d7SBaskov Evgeniy * encounter firmware bugs. 24582e0d6d7SBaskov Evgeniy */ 24682e0d6d7SBaskov Evgeniy 24782e0d6d7SBaskov Evgeniy for (end = start + size; start < end; start = next) { 24882e0d6d7SBaskov Evgeniy 24982e0d6d7SBaskov Evgeniy status = efi_dxe_call(get_memory_space_descriptor, start, &desc); 25082e0d6d7SBaskov Evgeniy 25182e0d6d7SBaskov Evgeniy if (status != EFI_SUCCESS) 25282e0d6d7SBaskov Evgeniy return; 25382e0d6d7SBaskov Evgeniy 25482e0d6d7SBaskov Evgeniy next = desc.base_address + desc.length; 25582e0d6d7SBaskov Evgeniy 25682e0d6d7SBaskov Evgeniy /* 25782e0d6d7SBaskov Evgeniy * Only system memory is suitable for trampoline/kernel image placement, 25882e0d6d7SBaskov Evgeniy * so only this type of memory needs its attributes to be modified. 25982e0d6d7SBaskov Evgeniy */ 26082e0d6d7SBaskov Evgeniy 26182e0d6d7SBaskov Evgeniy if (desc.gcd_memory_type != EfiGcdMemoryTypeSystemMemory || 26282e0d6d7SBaskov Evgeniy (desc.attributes & (EFI_MEMORY_RO | EFI_MEMORY_XP)) == 0) 26382e0d6d7SBaskov Evgeniy continue; 26482e0d6d7SBaskov Evgeniy 26582e0d6d7SBaskov Evgeniy unprotect_start = max(rounded_start, (unsigned long)desc.base_address); 26682e0d6d7SBaskov Evgeniy unprotect_size = min(rounded_end, next) - unprotect_start; 26782e0d6d7SBaskov Evgeniy 26882e0d6d7SBaskov Evgeniy status = efi_dxe_call(set_memory_space_attributes, 26982e0d6d7SBaskov Evgeniy unprotect_start, unprotect_size, 27082e0d6d7SBaskov Evgeniy EFI_MEMORY_WB); 27182e0d6d7SBaskov Evgeniy 27282e0d6d7SBaskov Evgeniy if (status != EFI_SUCCESS) { 27331f1a0edSArd Biesheuvel efi_warn("Unable to unprotect memory range [%08lx,%08lx]: %lx\n", 27482e0d6d7SBaskov Evgeniy unprotect_start, 27582e0d6d7SBaskov Evgeniy unprotect_start + unprotect_size, 27631f1a0edSArd Biesheuvel status); 27782e0d6d7SBaskov Evgeniy } 27882e0d6d7SBaskov Evgeniy } 27982e0d6d7SBaskov Evgeniy } 28082e0d6d7SBaskov Evgeniy 28182e0d6d7SBaskov Evgeniy /* 28282e0d6d7SBaskov Evgeniy * Trampoline takes 2 pages and can be loaded in first megabyte of memory 28382e0d6d7SBaskov Evgeniy * with its end placed between 128k and 640k where BIOS might start. 28482e0d6d7SBaskov Evgeniy * (see arch/x86/boot/compressed/pgtable_64.c) 28582e0d6d7SBaskov Evgeniy * 28682e0d6d7SBaskov Evgeniy * We cannot find exact trampoline placement since memory map 28782e0d6d7SBaskov Evgeniy * can be modified by UEFI, and it can alter the computed address. 28882e0d6d7SBaskov Evgeniy */ 28982e0d6d7SBaskov Evgeniy 29082e0d6d7SBaskov Evgeniy #define TRAMPOLINE_PLACEMENT_BASE ((128 - 8)*1024) 29182e0d6d7SBaskov Evgeniy #define TRAMPOLINE_PLACEMENT_SIZE (640*1024 - (128 - 8)*1024) 29282e0d6d7SBaskov Evgeniy 293*d2d7a54fSArd Biesheuvel extern const u8 startup_32[], startup_64[]; 29482e0d6d7SBaskov Evgeniy 29582e0d6d7SBaskov Evgeniy static void 29682e0d6d7SBaskov Evgeniy setup_memory_protection(unsigned long image_base, unsigned long image_size) 29782e0d6d7SBaskov Evgeniy { 29882e0d6d7SBaskov Evgeniy /* 29982e0d6d7SBaskov Evgeniy * Allow execution of possible trampoline used 30082e0d6d7SBaskov Evgeniy * for switching between 4- and 5-level page tables 30182e0d6d7SBaskov Evgeniy * and relocated kernel image. 30282e0d6d7SBaskov Evgeniy */ 30382e0d6d7SBaskov Evgeniy 30482e0d6d7SBaskov Evgeniy adjust_memory_range_protection(TRAMPOLINE_PLACEMENT_BASE, 30582e0d6d7SBaskov Evgeniy TRAMPOLINE_PLACEMENT_SIZE); 30682e0d6d7SBaskov Evgeniy 30782e0d6d7SBaskov Evgeniy #ifdef CONFIG_64BIT 30882e0d6d7SBaskov Evgeniy if (image_base != (unsigned long)startup_32) 30982e0d6d7SBaskov Evgeniy adjust_memory_range_protection(image_base, image_size); 31082e0d6d7SBaskov Evgeniy #else 31182e0d6d7SBaskov Evgeniy /* 31282e0d6d7SBaskov Evgeniy * Clear protection flags on a whole range of possible 31382e0d6d7SBaskov Evgeniy * addresses used for KASLR. We don't need to do that 31482e0d6d7SBaskov Evgeniy * on x86_64, since KASLR/extraction is performed after 31582e0d6d7SBaskov Evgeniy * dedicated identity page tables are built and we only 31682e0d6d7SBaskov Evgeniy * need to remove possible protection on relocated image 31782e0d6d7SBaskov Evgeniy * itself disregarding further relocations. 31882e0d6d7SBaskov Evgeniy */ 31982e0d6d7SBaskov Evgeniy adjust_memory_range_protection(LOAD_PHYSICAL_ADDR, 32082e0d6d7SBaskov Evgeniy KERNEL_IMAGE_SIZE - LOAD_PHYSICAL_ADDR); 32182e0d6d7SBaskov Evgeniy #endif 32282e0d6d7SBaskov Evgeniy } 32382e0d6d7SBaskov Evgeniy 324c0461bd1SDionna Glaze static void setup_unaccepted_memory(void) 325c0461bd1SDionna Glaze { 326c0461bd1SDionna Glaze efi_guid_t mem_acceptance_proto = OVMF_SEV_MEMORY_ACCEPTANCE_PROTOCOL_GUID; 327c0461bd1SDionna Glaze sev_memory_acceptance_protocol_t *proto; 328c0461bd1SDionna Glaze efi_status_t status; 329c0461bd1SDionna Glaze 330c0461bd1SDionna Glaze if (!IS_ENABLED(CONFIG_UNACCEPTED_MEMORY)) 331c0461bd1SDionna Glaze return; 332c0461bd1SDionna Glaze 333c0461bd1SDionna Glaze /* 334c0461bd1SDionna Glaze * Enable unaccepted memory before calling exit boot services in order 335c0461bd1SDionna Glaze * for the UEFI to not accept all memory on EBS. 336c0461bd1SDionna Glaze */ 337c0461bd1SDionna Glaze status = efi_bs_call(locate_protocol, &mem_acceptance_proto, NULL, 338c0461bd1SDionna Glaze (void **)&proto); 339c0461bd1SDionna Glaze if (status != EFI_SUCCESS) 340c0461bd1SDionna Glaze return; 341c0461bd1SDionna Glaze 342c0461bd1SDionna Glaze status = efi_call_proto(proto, allow_unaccepted_memory); 343c0461bd1SDionna Glaze if (status != EFI_SUCCESS) 344c0461bd1SDionna Glaze efi_err("Memory acceptance protocol failed\n"); 345c0461bd1SDionna Glaze } 346c0461bd1SDionna Glaze 347c2d0b470SArd Biesheuvel static const efi_char16_t apple[] = L"Apple"; 348c2d0b470SArd Biesheuvel 34982e0d6d7SBaskov Evgeniy static void setup_quirks(struct boot_params *boot_params, 35082e0d6d7SBaskov Evgeniy unsigned long image_base, 35182e0d6d7SBaskov Evgeniy unsigned long image_size) 352c2d0b470SArd Biesheuvel { 353c2d0b470SArd Biesheuvel efi_char16_t *fw_vendor = (efi_char16_t *)(unsigned long) 354ccc27ae7SArd Biesheuvel efi_table_attr(efi_system_table, fw_vendor); 355c2d0b470SArd Biesheuvel 356c2d0b470SArd Biesheuvel if (!memcmp(fw_vendor, apple, sizeof(apple))) { 357c2d0b470SArd Biesheuvel if (IS_ENABLED(CONFIG_APPLE_PROPERTIES)) 358c2d0b470SArd Biesheuvel retrieve_apple_device_properties(boot_params); 359c2d0b470SArd Biesheuvel } 36082e0d6d7SBaskov Evgeniy 36182e0d6d7SBaskov Evgeniy if (IS_ENABLED(CONFIG_EFI_DXE_MEM_ATTRIBUTES)) 36282e0d6d7SBaskov Evgeniy setup_memory_protection(image_base, image_size); 363c2d0b470SArd Biesheuvel } 364c2d0b470SArd Biesheuvel 365c2d0b470SArd Biesheuvel /* 366c2d0b470SArd Biesheuvel * See if we have Universal Graphics Adapter (UGA) protocol 367c2d0b470SArd Biesheuvel */ 368c2d0b470SArd Biesheuvel static efi_status_t 369c2d0b470SArd Biesheuvel setup_uga(struct screen_info *si, efi_guid_t *uga_proto, unsigned long size) 370c2d0b470SArd Biesheuvel { 371c2d0b470SArd Biesheuvel efi_status_t status; 372c2d0b470SArd Biesheuvel u32 width, height; 373c2d0b470SArd Biesheuvel void **uga_handle = NULL; 374c2d0b470SArd Biesheuvel efi_uga_draw_protocol_t *uga = NULL, *first_uga; 375c2d0b470SArd Biesheuvel efi_handle_t handle; 376c2d0b470SArd Biesheuvel int i; 377c2d0b470SArd Biesheuvel 378c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 379c2d0b470SArd Biesheuvel (void **)&uga_handle); 380c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 381c2d0b470SArd Biesheuvel return status; 382c2d0b470SArd Biesheuvel 383c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 384c2d0b470SArd Biesheuvel uga_proto, NULL, &size, uga_handle); 385c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 386c2d0b470SArd Biesheuvel goto free_handle; 387c2d0b470SArd Biesheuvel 388c2d0b470SArd Biesheuvel height = 0; 389c2d0b470SArd Biesheuvel width = 0; 390c2d0b470SArd Biesheuvel 391c2d0b470SArd Biesheuvel first_uga = NULL; 392c2d0b470SArd Biesheuvel for_each_efi_handle(handle, uga_handle, size, i) { 393c2d0b470SArd Biesheuvel efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID; 394c2d0b470SArd Biesheuvel u32 w, h, depth, refresh; 395c2d0b470SArd Biesheuvel void *pciio; 396c2d0b470SArd Biesheuvel 397c2d0b470SArd Biesheuvel status = efi_bs_call(handle_protocol, handle, uga_proto, 398c2d0b470SArd Biesheuvel (void **)&uga); 399c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 400c2d0b470SArd Biesheuvel continue; 401c2d0b470SArd Biesheuvel 402c2d0b470SArd Biesheuvel pciio = NULL; 403c2d0b470SArd Biesheuvel efi_bs_call(handle_protocol, handle, &pciio_proto, &pciio); 404c2d0b470SArd Biesheuvel 405c2d0b470SArd Biesheuvel status = efi_call_proto(uga, get_mode, &w, &h, &depth, &refresh); 406c2d0b470SArd Biesheuvel if (status == EFI_SUCCESS && (!first_uga || pciio)) { 407c2d0b470SArd Biesheuvel width = w; 408c2d0b470SArd Biesheuvel height = h; 409c2d0b470SArd Biesheuvel 410c2d0b470SArd Biesheuvel /* 411c2d0b470SArd Biesheuvel * Once we've found a UGA supporting PCIIO, 412c2d0b470SArd Biesheuvel * don't bother looking any further. 413c2d0b470SArd Biesheuvel */ 414c2d0b470SArd Biesheuvel if (pciio) 415c2d0b470SArd Biesheuvel break; 416c2d0b470SArd Biesheuvel 417c2d0b470SArd Biesheuvel first_uga = uga; 418c2d0b470SArd Biesheuvel } 419c2d0b470SArd Biesheuvel } 420c2d0b470SArd Biesheuvel 421c2d0b470SArd Biesheuvel if (!width && !height) 422c2d0b470SArd Biesheuvel goto free_handle; 423c2d0b470SArd Biesheuvel 424c2d0b470SArd Biesheuvel /* EFI framebuffer */ 425c2d0b470SArd Biesheuvel si->orig_video_isVGA = VIDEO_TYPE_EFI; 426c2d0b470SArd Biesheuvel 427c2d0b470SArd Biesheuvel si->lfb_depth = 32; 428c2d0b470SArd Biesheuvel si->lfb_width = width; 429c2d0b470SArd Biesheuvel si->lfb_height = height; 430c2d0b470SArd Biesheuvel 431c2d0b470SArd Biesheuvel si->red_size = 8; 432c2d0b470SArd Biesheuvel si->red_pos = 16; 433c2d0b470SArd Biesheuvel si->green_size = 8; 434c2d0b470SArd Biesheuvel si->green_pos = 8; 435c2d0b470SArd Biesheuvel si->blue_size = 8; 436c2d0b470SArd Biesheuvel si->blue_pos = 0; 437c2d0b470SArd Biesheuvel si->rsvd_size = 8; 438c2d0b470SArd Biesheuvel si->rsvd_pos = 24; 439c2d0b470SArd Biesheuvel 440c2d0b470SArd Biesheuvel free_handle: 441c2d0b470SArd Biesheuvel efi_bs_call(free_pool, uga_handle); 442c2d0b470SArd Biesheuvel 443c2d0b470SArd Biesheuvel return status; 444c2d0b470SArd Biesheuvel } 445c2d0b470SArd Biesheuvel 446c2d0b470SArd Biesheuvel static void setup_graphics(struct boot_params *boot_params) 447c2d0b470SArd Biesheuvel { 448c2d0b470SArd Biesheuvel efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID; 449c2d0b470SArd Biesheuvel struct screen_info *si; 450c2d0b470SArd Biesheuvel efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID; 451c2d0b470SArd Biesheuvel efi_status_t status; 452c2d0b470SArd Biesheuvel unsigned long size; 453c2d0b470SArd Biesheuvel void **gop_handle = NULL; 454c2d0b470SArd Biesheuvel void **uga_handle = NULL; 455c2d0b470SArd Biesheuvel 456c2d0b470SArd Biesheuvel si = &boot_params->screen_info; 457c2d0b470SArd Biesheuvel memset(si, 0, sizeof(*si)); 458c2d0b470SArd Biesheuvel 459c2d0b470SArd Biesheuvel size = 0; 460c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 461c2d0b470SArd Biesheuvel &graphics_proto, NULL, &size, gop_handle); 462c2d0b470SArd Biesheuvel if (status == EFI_BUFFER_TOO_SMALL) 463c2d0b470SArd Biesheuvel status = efi_setup_gop(si, &graphics_proto, size); 464c2d0b470SArd Biesheuvel 465c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 466c2d0b470SArd Biesheuvel size = 0; 467c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 468c2d0b470SArd Biesheuvel &uga_proto, NULL, &size, uga_handle); 469c2d0b470SArd Biesheuvel if (status == EFI_BUFFER_TOO_SMALL) 470c2d0b470SArd Biesheuvel setup_uga(si, &uga_proto, size); 471c2d0b470SArd Biesheuvel } 472c2d0b470SArd Biesheuvel } 473c2d0b470SArd Biesheuvel 4743b8f44fcSArd Biesheuvel 4753b8f44fcSArd Biesheuvel static void __noreturn efi_exit(efi_handle_t handle, efi_status_t status) 4763b8f44fcSArd Biesheuvel { 4773b8f44fcSArd Biesheuvel efi_bs_call(exit, handle, status, 0, NULL); 478f3fa0efcSArd Biesheuvel for(;;) 479f3fa0efcSArd Biesheuvel asm("hlt"); 4803b8f44fcSArd Biesheuvel } 4813b8f44fcSArd Biesheuvel 482c2d0b470SArd Biesheuvel void __noreturn efi_stub_entry(efi_handle_t handle, 483c2d0b470SArd Biesheuvel efi_system_table_t *sys_table_arg, 484c2d0b470SArd Biesheuvel struct boot_params *boot_params); 485c2d0b470SArd Biesheuvel 486c2d0b470SArd Biesheuvel /* 487c2d0b470SArd Biesheuvel * Because the x86 boot code expects to be passed a boot_params we 488c2d0b470SArd Biesheuvel * need to create one ourselves (usually the bootloader would create 489c2d0b470SArd Biesheuvel * one for us). 490c2d0b470SArd Biesheuvel */ 491c2d0b470SArd Biesheuvel efi_status_t __efiapi efi_pe_entry(efi_handle_t handle, 492c2d0b470SArd Biesheuvel efi_system_table_t *sys_table_arg) 493c2d0b470SArd Biesheuvel { 494c2d0b470SArd Biesheuvel struct boot_params *boot_params; 495c2d0b470SArd Biesheuvel struct setup_header *hdr; 4961887c9b6SArvind Sankar void *image_base; 497c2d0b470SArd Biesheuvel efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID; 498c2d0b470SArd Biesheuvel int options_size = 0; 499c2d0b470SArd Biesheuvel efi_status_t status; 500c2d0b470SArd Biesheuvel char *cmdline_ptr; 501c2d0b470SArd Biesheuvel 502ccc27ae7SArd Biesheuvel efi_system_table = sys_table_arg; 503c2d0b470SArd Biesheuvel 504c2d0b470SArd Biesheuvel /* Check if we were booted by the EFI firmware */ 505ccc27ae7SArd Biesheuvel if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) 5063b8f44fcSArd Biesheuvel efi_exit(handle, EFI_INVALID_PARAMETER); 507c2d0b470SArd Biesheuvel 5080347d8c2SArvind Sankar status = efi_bs_call(handle_protocol, handle, &proto, (void **)&image); 509c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 51036bdd0a7SArvind Sankar efi_err("Failed to get handle for LOADED_IMAGE_PROTOCOL\n"); 5113b8f44fcSArd Biesheuvel efi_exit(handle, status); 512c2d0b470SArd Biesheuvel } 513c2d0b470SArd Biesheuvel 5141887c9b6SArvind Sankar image_base = efi_table_attr(image, image_base); 5151887c9b6SArvind Sankar image_offset = (void *)startup_32 - image_base; 5161887c9b6SArvind Sankar 517019512f1SArvind Sankar status = efi_allocate_pages(sizeof(struct boot_params), 518019512f1SArvind Sankar (unsigned long *)&boot_params, ULONG_MAX); 519c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 52036bdd0a7SArvind Sankar efi_err("Failed to allocate lowmem for boot params\n"); 5213b8f44fcSArd Biesheuvel efi_exit(handle, status); 522c2d0b470SArd Biesheuvel } 523c2d0b470SArd Biesheuvel 524019512f1SArvind Sankar memset(boot_params, 0x0, sizeof(struct boot_params)); 525c2d0b470SArd Biesheuvel 526c2d0b470SArd Biesheuvel hdr = &boot_params->hdr; 527c2d0b470SArd Biesheuvel 52859476f80SArvind Sankar /* Copy the setup header from the second sector to boot_params */ 52959476f80SArvind Sankar memcpy(&hdr->jump, image_base + 512, 53059476f80SArvind Sankar sizeof(struct setup_header) - offsetof(struct setup_header, jump)); 531c2d0b470SArd Biesheuvel 532c2d0b470SArd Biesheuvel /* 533c2d0b470SArd Biesheuvel * Fill out some of the header fields ourselves because the 534c2d0b470SArd Biesheuvel * EFI firmware loader doesn't load the first sector. 535c2d0b470SArd Biesheuvel */ 536c2d0b470SArd Biesheuvel hdr->root_flags = 1; 537c2d0b470SArd Biesheuvel hdr->vid_mode = 0xffff; 538c2d0b470SArd Biesheuvel hdr->boot_flag = 0xAA55; 539c2d0b470SArd Biesheuvel 540c2d0b470SArd Biesheuvel hdr->type_of_loader = 0x21; 541c2d0b470SArd Biesheuvel 542c2d0b470SArd Biesheuvel /* Convert unicode cmdline to ascii */ 54327cd5511SArd Biesheuvel cmdline_ptr = efi_convert_cmdline(image, &options_size); 544c2d0b470SArd Biesheuvel if (!cmdline_ptr) 545c2d0b470SArd Biesheuvel goto fail; 546c2d0b470SArd Biesheuvel 547eed4e019SArvind Sankar efi_set_u64_split((unsigned long)cmdline_ptr, 548eed4e019SArvind Sankar &hdr->cmd_line_ptr, &boot_params->ext_cmd_line_ptr); 549c2d0b470SArd Biesheuvel 550c2d0b470SArd Biesheuvel hdr->ramdisk_image = 0; 551c2d0b470SArd Biesheuvel hdr->ramdisk_size = 0; 552c2d0b470SArd Biesheuvel 55363bf28ceSArd Biesheuvel /* 55463bf28ceSArd Biesheuvel * Disregard any setup data that was provided by the bootloader: 55563bf28ceSArd Biesheuvel * setup_data could be pointing anywhere, and we have no way of 55663bf28ceSArd Biesheuvel * authenticating or validating the payload. 55763bf28ceSArd Biesheuvel */ 55863bf28ceSArd Biesheuvel hdr->setup_data = 0; 55963bf28ceSArd Biesheuvel 560ccc27ae7SArd Biesheuvel efi_stub_entry(handle, sys_table_arg, boot_params); 561c2d0b470SArd Biesheuvel /* not reached */ 562c2d0b470SArd Biesheuvel 563c2d0b470SArd Biesheuvel fail: 564019512f1SArvind Sankar efi_free(sizeof(struct boot_params), (unsigned long)boot_params); 565c2d0b470SArd Biesheuvel 5663b8f44fcSArd Biesheuvel efi_exit(handle, status); 567c2d0b470SArd Biesheuvel } 568c2d0b470SArd Biesheuvel 569c2d0b470SArd Biesheuvel static void add_e820ext(struct boot_params *params, 570c2d0b470SArd Biesheuvel struct setup_data *e820ext, u32 nr_entries) 571c2d0b470SArd Biesheuvel { 572c2d0b470SArd Biesheuvel struct setup_data *data; 573c2d0b470SArd Biesheuvel 574c2d0b470SArd Biesheuvel e820ext->type = SETUP_E820_EXT; 575c2d0b470SArd Biesheuvel e820ext->len = nr_entries * sizeof(struct boot_e820_entry); 576c2d0b470SArd Biesheuvel e820ext->next = 0; 577c2d0b470SArd Biesheuvel 578c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)params->hdr.setup_data; 579c2d0b470SArd Biesheuvel 580c2d0b470SArd Biesheuvel while (data && data->next) 581c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)data->next; 582c2d0b470SArd Biesheuvel 583c2d0b470SArd Biesheuvel if (data) 584c2d0b470SArd Biesheuvel data->next = (unsigned long)e820ext; 585c2d0b470SArd Biesheuvel else 586c2d0b470SArd Biesheuvel params->hdr.setup_data = (unsigned long)e820ext; 587c2d0b470SArd Biesheuvel } 588c2d0b470SArd Biesheuvel 589c2d0b470SArd Biesheuvel static efi_status_t 590c2d0b470SArd Biesheuvel setup_e820(struct boot_params *params, struct setup_data *e820ext, u32 e820ext_size) 591c2d0b470SArd Biesheuvel { 592c2d0b470SArd Biesheuvel struct boot_e820_entry *entry = params->e820_table; 593c2d0b470SArd Biesheuvel struct efi_info *efi = ¶ms->efi_info; 594c2d0b470SArd Biesheuvel struct boot_e820_entry *prev = NULL; 595c2d0b470SArd Biesheuvel u32 nr_entries; 596c2d0b470SArd Biesheuvel u32 nr_desc; 597c2d0b470SArd Biesheuvel int i; 598c2d0b470SArd Biesheuvel 599c2d0b470SArd Biesheuvel nr_entries = 0; 600c2d0b470SArd Biesheuvel nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size; 601c2d0b470SArd Biesheuvel 602c2d0b470SArd Biesheuvel for (i = 0; i < nr_desc; i++) { 603c2d0b470SArd Biesheuvel efi_memory_desc_t *d; 604c2d0b470SArd Biesheuvel unsigned int e820_type = 0; 605c2d0b470SArd Biesheuvel unsigned long m = efi->efi_memmap; 606c2d0b470SArd Biesheuvel 607c2d0b470SArd Biesheuvel #ifdef CONFIG_X86_64 608c2d0b470SArd Biesheuvel m |= (u64)efi->efi_memmap_hi << 32; 609c2d0b470SArd Biesheuvel #endif 610c2d0b470SArd Biesheuvel 611c2d0b470SArd Biesheuvel d = efi_early_memdesc_ptr(m, efi->efi_memdesc_size, i); 612c2d0b470SArd Biesheuvel switch (d->type) { 613c2d0b470SArd Biesheuvel case EFI_RESERVED_TYPE: 614c2d0b470SArd Biesheuvel case EFI_RUNTIME_SERVICES_CODE: 615c2d0b470SArd Biesheuvel case EFI_RUNTIME_SERVICES_DATA: 616c2d0b470SArd Biesheuvel case EFI_MEMORY_MAPPED_IO: 617c2d0b470SArd Biesheuvel case EFI_MEMORY_MAPPED_IO_PORT_SPACE: 618c2d0b470SArd Biesheuvel case EFI_PAL_CODE: 619c2d0b470SArd Biesheuvel e820_type = E820_TYPE_RESERVED; 620c2d0b470SArd Biesheuvel break; 621c2d0b470SArd Biesheuvel 622c2d0b470SArd Biesheuvel case EFI_UNUSABLE_MEMORY: 623c2d0b470SArd Biesheuvel e820_type = E820_TYPE_UNUSABLE; 624c2d0b470SArd Biesheuvel break; 625c2d0b470SArd Biesheuvel 626c2d0b470SArd Biesheuvel case EFI_ACPI_RECLAIM_MEMORY: 627c2d0b470SArd Biesheuvel e820_type = E820_TYPE_ACPI; 628c2d0b470SArd Biesheuvel break; 629c2d0b470SArd Biesheuvel 630c2d0b470SArd Biesheuvel case EFI_LOADER_CODE: 631c2d0b470SArd Biesheuvel case EFI_LOADER_DATA: 632c2d0b470SArd Biesheuvel case EFI_BOOT_SERVICES_CODE: 633c2d0b470SArd Biesheuvel case EFI_BOOT_SERVICES_DATA: 634c2d0b470SArd Biesheuvel case EFI_CONVENTIONAL_MEMORY: 635c2d0b470SArd Biesheuvel if (efi_soft_reserve_enabled() && 636c2d0b470SArd Biesheuvel (d->attribute & EFI_MEMORY_SP)) 637c2d0b470SArd Biesheuvel e820_type = E820_TYPE_SOFT_RESERVED; 638c2d0b470SArd Biesheuvel else 639c2d0b470SArd Biesheuvel e820_type = E820_TYPE_RAM; 640c2d0b470SArd Biesheuvel break; 641c2d0b470SArd Biesheuvel 642c2d0b470SArd Biesheuvel case EFI_ACPI_MEMORY_NVS: 643c2d0b470SArd Biesheuvel e820_type = E820_TYPE_NVS; 644c2d0b470SArd Biesheuvel break; 645c2d0b470SArd Biesheuvel 646c2d0b470SArd Biesheuvel case EFI_PERSISTENT_MEMORY: 647c2d0b470SArd Biesheuvel e820_type = E820_TYPE_PMEM; 648c2d0b470SArd Biesheuvel break; 649c2d0b470SArd Biesheuvel 650745e3ed8SKirill A. Shutemov case EFI_UNACCEPTED_MEMORY: 651745e3ed8SKirill A. Shutemov if (!IS_ENABLED(CONFIG_UNACCEPTED_MEMORY)) { 652745e3ed8SKirill A. Shutemov efi_warn_once( 653745e3ed8SKirill A. Shutemov "The system has unaccepted memory, but kernel does not support it\nConsider enabling CONFIG_UNACCEPTED_MEMORY\n"); 654745e3ed8SKirill A. Shutemov continue; 655745e3ed8SKirill A. Shutemov } 656745e3ed8SKirill A. Shutemov e820_type = E820_TYPE_RAM; 657745e3ed8SKirill A. Shutemov process_unaccepted_memory(d->phys_addr, 658745e3ed8SKirill A. Shutemov d->phys_addr + PAGE_SIZE * d->num_pages); 659745e3ed8SKirill A. Shutemov break; 660c2d0b470SArd Biesheuvel default: 661c2d0b470SArd Biesheuvel continue; 662c2d0b470SArd Biesheuvel } 663c2d0b470SArd Biesheuvel 664c2d0b470SArd Biesheuvel /* Merge adjacent mappings */ 665c2d0b470SArd Biesheuvel if (prev && prev->type == e820_type && 666c2d0b470SArd Biesheuvel (prev->addr + prev->size) == d->phys_addr) { 667c2d0b470SArd Biesheuvel prev->size += d->num_pages << 12; 668c2d0b470SArd Biesheuvel continue; 669c2d0b470SArd Biesheuvel } 670c2d0b470SArd Biesheuvel 671c2d0b470SArd Biesheuvel if (nr_entries == ARRAY_SIZE(params->e820_table)) { 672c2d0b470SArd Biesheuvel u32 need = (nr_desc - i) * sizeof(struct e820_entry) + 673c2d0b470SArd Biesheuvel sizeof(struct setup_data); 674c2d0b470SArd Biesheuvel 675c2d0b470SArd Biesheuvel if (!e820ext || e820ext_size < need) 676c2d0b470SArd Biesheuvel return EFI_BUFFER_TOO_SMALL; 677c2d0b470SArd Biesheuvel 678c2d0b470SArd Biesheuvel /* boot_params map full, switch to e820 extended */ 679c2d0b470SArd Biesheuvel entry = (struct boot_e820_entry *)e820ext->data; 680c2d0b470SArd Biesheuvel } 681c2d0b470SArd Biesheuvel 682c2d0b470SArd Biesheuvel entry->addr = d->phys_addr; 683c2d0b470SArd Biesheuvel entry->size = d->num_pages << PAGE_SHIFT; 684c2d0b470SArd Biesheuvel entry->type = e820_type; 685c2d0b470SArd Biesheuvel prev = entry++; 686c2d0b470SArd Biesheuvel nr_entries++; 687c2d0b470SArd Biesheuvel } 688c2d0b470SArd Biesheuvel 689c2d0b470SArd Biesheuvel if (nr_entries > ARRAY_SIZE(params->e820_table)) { 690c2d0b470SArd Biesheuvel u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_table); 691c2d0b470SArd Biesheuvel 692c2d0b470SArd Biesheuvel add_e820ext(params, e820ext, nr_e820ext); 693c2d0b470SArd Biesheuvel nr_entries -= nr_e820ext; 694c2d0b470SArd Biesheuvel } 695c2d0b470SArd Biesheuvel 696c2d0b470SArd Biesheuvel params->e820_entries = (u8)nr_entries; 697c2d0b470SArd Biesheuvel 698c2d0b470SArd Biesheuvel return EFI_SUCCESS; 699c2d0b470SArd Biesheuvel } 700c2d0b470SArd Biesheuvel 701c2d0b470SArd Biesheuvel static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext, 702c2d0b470SArd Biesheuvel u32 *e820ext_size) 703c2d0b470SArd Biesheuvel { 704c2d0b470SArd Biesheuvel efi_status_t status; 705c2d0b470SArd Biesheuvel unsigned long size; 706c2d0b470SArd Biesheuvel 707c2d0b470SArd Biesheuvel size = sizeof(struct setup_data) + 708c2d0b470SArd Biesheuvel sizeof(struct e820_entry) * nr_desc; 709c2d0b470SArd Biesheuvel 710c2d0b470SArd Biesheuvel if (*e820ext) { 711c2d0b470SArd Biesheuvel efi_bs_call(free_pool, *e820ext); 712c2d0b470SArd Biesheuvel *e820ext = NULL; 713c2d0b470SArd Biesheuvel *e820ext_size = 0; 714c2d0b470SArd Biesheuvel } 715c2d0b470SArd Biesheuvel 716c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 717c2d0b470SArd Biesheuvel (void **)e820ext); 718c2d0b470SArd Biesheuvel if (status == EFI_SUCCESS) 719c2d0b470SArd Biesheuvel *e820ext_size = size; 720c2d0b470SArd Biesheuvel 721c2d0b470SArd Biesheuvel return status; 722c2d0b470SArd Biesheuvel } 723c2d0b470SArd Biesheuvel 724c2d0b470SArd Biesheuvel static efi_status_t allocate_e820(struct boot_params *params, 725c2d0b470SArd Biesheuvel struct setup_data **e820ext, 726c2d0b470SArd Biesheuvel u32 *e820ext_size) 727c2d0b470SArd Biesheuvel { 7282e9f46eeSKirill A. Shutemov struct efi_boot_memmap *map; 729c2d0b470SArd Biesheuvel efi_status_t status; 7302e9f46eeSKirill A. Shutemov __u32 nr_desc; 731c2d0b470SArd Biesheuvel 7322e9f46eeSKirill A. Shutemov status = efi_get_memory_map(&map, false); 733c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 734c2d0b470SArd Biesheuvel return status; 7352e9f46eeSKirill A. Shutemov 7362e9f46eeSKirill A. Shutemov nr_desc = map->map_size / map->desc_size; 7372e9f46eeSKirill A. Shutemov if (nr_desc > ARRAY_SIZE(params->e820_table) - EFI_MMAP_NR_SLACK_SLOTS) { 7382e9f46eeSKirill A. Shutemov u32 nr_e820ext = nr_desc - ARRAY_SIZE(params->e820_table) + 7392e9f46eeSKirill A. Shutemov EFI_MMAP_NR_SLACK_SLOTS; 7402e9f46eeSKirill A. Shutemov 7412e9f46eeSKirill A. Shutemov status = alloc_e820ext(nr_e820ext, e820ext, e820ext_size); 742c2d0b470SArd Biesheuvel } 743c2d0b470SArd Biesheuvel 744745e3ed8SKirill A. Shutemov if (IS_ENABLED(CONFIG_UNACCEPTED_MEMORY) && status == EFI_SUCCESS) 745745e3ed8SKirill A. Shutemov status = allocate_unaccepted_bitmap(nr_desc, map); 746745e3ed8SKirill A. Shutemov 7472e9f46eeSKirill A. Shutemov efi_bs_call(free_pool, map); 7482e9f46eeSKirill A. Shutemov return status; 749c2d0b470SArd Biesheuvel } 750c2d0b470SArd Biesheuvel 751c2d0b470SArd Biesheuvel struct exit_boot_struct { 752c2d0b470SArd Biesheuvel struct boot_params *boot_params; 753c2d0b470SArd Biesheuvel struct efi_info *efi; 754c2d0b470SArd Biesheuvel }; 755c2d0b470SArd Biesheuvel 756c2d0b470SArd Biesheuvel static efi_status_t exit_boot_func(struct efi_boot_memmap *map, 757c2d0b470SArd Biesheuvel void *priv) 758c2d0b470SArd Biesheuvel { 759c2d0b470SArd Biesheuvel const char *signature; 760c2d0b470SArd Biesheuvel struct exit_boot_struct *p = priv; 761c2d0b470SArd Biesheuvel 762c2d0b470SArd Biesheuvel signature = efi_is_64bit() ? EFI64_LOADER_SIGNATURE 763c2d0b470SArd Biesheuvel : EFI32_LOADER_SIGNATURE; 764c2d0b470SArd Biesheuvel memcpy(&p->efi->efi_loader_signature, signature, sizeof(__u32)); 765c2d0b470SArd Biesheuvel 766eed4e019SArvind Sankar efi_set_u64_split((unsigned long)efi_system_table, 767eed4e019SArvind Sankar &p->efi->efi_systab, &p->efi->efi_systab_hi); 768eab31265SArd Biesheuvel p->efi->efi_memdesc_size = map->desc_size; 769eab31265SArd Biesheuvel p->efi->efi_memdesc_version = map->desc_ver; 770eab31265SArd Biesheuvel efi_set_u64_split((unsigned long)map->map, 771eed4e019SArvind Sankar &p->efi->efi_memmap, &p->efi->efi_memmap_hi); 772eab31265SArd Biesheuvel p->efi->efi_memmap_size = map->map_size; 773c2d0b470SArd Biesheuvel 774c2d0b470SArd Biesheuvel return EFI_SUCCESS; 775c2d0b470SArd Biesheuvel } 776c2d0b470SArd Biesheuvel 777c2d0b470SArd Biesheuvel static efi_status_t exit_boot(struct boot_params *boot_params, void *handle) 778c2d0b470SArd Biesheuvel { 779c2d0b470SArd Biesheuvel struct setup_data *e820ext = NULL; 780c2d0b470SArd Biesheuvel __u32 e820ext_size = 0; 781c2d0b470SArd Biesheuvel efi_status_t status; 782c2d0b470SArd Biesheuvel struct exit_boot_struct priv; 783c2d0b470SArd Biesheuvel 784c2d0b470SArd Biesheuvel priv.boot_params = boot_params; 785c2d0b470SArd Biesheuvel priv.efi = &boot_params->efi_info; 786c2d0b470SArd Biesheuvel 787c2d0b470SArd Biesheuvel status = allocate_e820(boot_params, &e820ext, &e820ext_size); 788c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 789c2d0b470SArd Biesheuvel return status; 790c2d0b470SArd Biesheuvel 791c2d0b470SArd Biesheuvel /* Might as well exit boot services now */ 792eab31265SArd Biesheuvel status = efi_exit_boot_services(handle, &priv, exit_boot_func); 793c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 794c2d0b470SArd Biesheuvel return status; 795c2d0b470SArd Biesheuvel 796c2d0b470SArd Biesheuvel /* Historic? */ 797c2d0b470SArd Biesheuvel boot_params->alt_mem_k = 32 * 1024; 798c2d0b470SArd Biesheuvel 799c2d0b470SArd Biesheuvel status = setup_e820(boot_params, e820ext, e820ext_size); 800c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 801c2d0b470SArd Biesheuvel return status; 802c2d0b470SArd Biesheuvel 803c2d0b470SArd Biesheuvel return EFI_SUCCESS; 804c2d0b470SArd Biesheuvel } 805c2d0b470SArd Biesheuvel 806*d2d7a54fSArd Biesheuvel static void __noreturn enter_kernel(unsigned long kernel_addr, 807*d2d7a54fSArd Biesheuvel struct boot_params *boot_params) 808*d2d7a54fSArd Biesheuvel { 809*d2d7a54fSArd Biesheuvel /* enter decompressed kernel with boot_params pointer in RSI/ESI */ 810*d2d7a54fSArd Biesheuvel asm("jmp *%0"::"r"(kernel_addr), "S"(boot_params)); 811*d2d7a54fSArd Biesheuvel 812*d2d7a54fSArd Biesheuvel unreachable(); 813*d2d7a54fSArd Biesheuvel } 814*d2d7a54fSArd Biesheuvel 815c2d0b470SArd Biesheuvel /* 816*d2d7a54fSArd Biesheuvel * On success, this routine will jump to the relocated image directly and never 817*d2d7a54fSArd Biesheuvel * return. On failure, it will exit to the firmware via efi_exit() instead of 818*d2d7a54fSArd Biesheuvel * returning. 819c2d0b470SArd Biesheuvel */ 820db14655aSArd Biesheuvel asmlinkage unsigned long efi_main(efi_handle_t handle, 821c2d0b470SArd Biesheuvel efi_system_table_t *sys_table_arg, 822c2d0b470SArd Biesheuvel struct boot_params *boot_params) 823c2d0b470SArd Biesheuvel { 824c2d0b470SArd Biesheuvel unsigned long bzimage_addr = (unsigned long)startup_32; 825d5cdf4cfSArvind Sankar unsigned long buffer_start, buffer_end; 826c2d0b470SArd Biesheuvel struct setup_header *hdr = &boot_params->hdr; 827f4dc7fffSArd Biesheuvel const struct linux_efi_initrd *initrd = NULL; 828c2d0b470SArd Biesheuvel efi_status_t status; 829c2d0b470SArd Biesheuvel 830ccc27ae7SArd Biesheuvel efi_system_table = sys_table_arg; 831c2d0b470SArd Biesheuvel /* Check if we were booted by the EFI firmware */ 832ccc27ae7SArd Biesheuvel if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) 8333b8f44fcSArd Biesheuvel efi_exit(handle, EFI_INVALID_PARAMETER); 834c2d0b470SArd Biesheuvel 8353ba75c13SBaskov Evgeniy efi_dxe_table = get_efi_config_table(EFI_DXE_SERVICES_TABLE_GUID); 8363ba75c13SBaskov Evgeniy if (efi_dxe_table && 8373ba75c13SBaskov Evgeniy efi_dxe_table->hdr.signature != EFI_DXE_SERVICES_TABLE_SIGNATURE) { 8383ba75c13SBaskov Evgeniy efi_warn("Ignoring DXE services table: invalid signature\n"); 8393ba75c13SBaskov Evgeniy efi_dxe_table = NULL; 8403ba75c13SBaskov Evgeniy } 8413ba75c13SBaskov Evgeniy 842c2d0b470SArd Biesheuvel /* 843d5cdf4cfSArvind Sankar * If the kernel isn't already loaded at a suitable address, 844d5cdf4cfSArvind Sankar * relocate it. 845d5cdf4cfSArvind Sankar * 846d5cdf4cfSArvind Sankar * It must be loaded above LOAD_PHYSICAL_ADDR. 847d5cdf4cfSArvind Sankar * 848d5cdf4cfSArvind Sankar * The maximum address for 64-bit is 1 << 46 for 4-level paging. This 849d5cdf4cfSArvind Sankar * is defined as the macro MAXMEM, but unfortunately that is not a 850d5cdf4cfSArvind Sankar * compile-time constant if 5-level paging is configured, so we instead 851d5cdf4cfSArvind Sankar * define our own macro for use here. 852d5cdf4cfSArvind Sankar * 853d5cdf4cfSArvind Sankar * For 32-bit, the maximum address is complicated to figure out, for 854d5cdf4cfSArvind Sankar * now use KERNEL_IMAGE_SIZE, which will be 512MiB, the same as what 855d5cdf4cfSArvind Sankar * KASLR uses. 856d5cdf4cfSArvind Sankar * 85721cb9b41SArvind Sankar * Also relocate it if image_offset is zero, i.e. the kernel wasn't 85821cb9b41SArvind Sankar * loaded by LoadImage, but rather by a bootloader that called the 85921cb9b41SArvind Sankar * handover entry. The reason we must always relocate in this case is 86021cb9b41SArvind Sankar * to handle the case of systemd-boot booting a unified kernel image, 86121cb9b41SArvind Sankar * which is a PE executable that contains the bzImage and an initrd as 86221cb9b41SArvind Sankar * COFF sections. The initrd section is placed after the bzImage 86321cb9b41SArvind Sankar * without ensuring that there are at least init_size bytes available 86421cb9b41SArvind Sankar * for the bzImage, and thus the compressed kernel's startup code may 86521cb9b41SArvind Sankar * overwrite the initrd unless it is moved out of the way. 866c2d0b470SArd Biesheuvel */ 867d5cdf4cfSArvind Sankar 868d5cdf4cfSArvind Sankar buffer_start = ALIGN(bzimage_addr - image_offset, 869d5cdf4cfSArvind Sankar hdr->kernel_alignment); 870d5cdf4cfSArvind Sankar buffer_end = buffer_start + hdr->init_size; 871d5cdf4cfSArvind Sankar 872d5cdf4cfSArvind Sankar if ((buffer_start < LOAD_PHYSICAL_ADDR) || 873d5cdf4cfSArvind Sankar (IS_ENABLED(CONFIG_X86_32) && buffer_end > KERNEL_IMAGE_SIZE) || 874d5cdf4cfSArvind Sankar (IS_ENABLED(CONFIG_X86_64) && buffer_end > MAXMEM_X86_64_4LEVEL) || 87521cb9b41SArvind Sankar (image_offset == 0)) { 876688eb282SArvind Sankar extern char _bss[]; 877688eb282SArvind Sankar 878c2d0b470SArd Biesheuvel status = efi_relocate_kernel(&bzimage_addr, 879688eb282SArvind Sankar (unsigned long)_bss - bzimage_addr, 880688eb282SArvind Sankar hdr->init_size, 881c2d0b470SArd Biesheuvel hdr->pref_address, 882c2d0b470SArd Biesheuvel hdr->kernel_alignment, 883c2d0b470SArd Biesheuvel LOAD_PHYSICAL_ADDR); 884c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 88536bdd0a7SArvind Sankar efi_err("efi_relocate_kernel() failed!\n"); 886c2d0b470SArd Biesheuvel goto fail; 887c2d0b470SArd Biesheuvel } 8881887c9b6SArvind Sankar /* 8891887c9b6SArvind Sankar * Now that we've copied the kernel elsewhere, we no longer 8901887c9b6SArvind Sankar * have a set up block before startup_32(), so reset image_offset 8911887c9b6SArvind Sankar * to zero in case it was set earlier. 8921887c9b6SArvind Sankar */ 8931887c9b6SArvind Sankar image_offset = 0; 894c2d0b470SArd Biesheuvel } 895c2d0b470SArd Biesheuvel 8967dde67f2SArvind Sankar #ifdef CONFIG_CMDLINE_BOOL 897055042beSArvind Sankar status = efi_parse_options(CONFIG_CMDLINE); 898055042beSArvind Sankar if (status != EFI_SUCCESS) { 899055042beSArvind Sankar efi_err("Failed to parse options\n"); 900055042beSArvind Sankar goto fail; 901055042beSArvind Sankar } 9027dde67f2SArvind Sankar #endif 9037dde67f2SArvind Sankar if (!IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) { 9047dde67f2SArvind Sankar unsigned long cmdline_paddr = ((u64)hdr->cmd_line_ptr | 905c2d0b470SArd Biesheuvel ((u64)boot_params->ext_cmd_line_ptr << 32)); 906055042beSArvind Sankar status = efi_parse_options((char *)cmdline_paddr); 907055042beSArvind Sankar if (status != EFI_SUCCESS) { 908055042beSArvind Sankar efi_err("Failed to parse options\n"); 909055042beSArvind Sankar goto fail; 910055042beSArvind Sankar } 9117dde67f2SArvind Sankar } 912c2d0b470SArd Biesheuvel 913c2d0b470SArd Biesheuvel /* 914987053a3SArvind Sankar * At this point, an initrd may already have been loaded by the 915987053a3SArvind Sankar * bootloader and passed via bootparams. We permit an initrd loaded 916987053a3SArvind Sankar * from the LINUX_EFI_INITRD_MEDIA_GUID device path to supersede it. 917987053a3SArvind Sankar * 918987053a3SArvind Sankar * If the device path is not present, any command-line initrd= 919987053a3SArvind Sankar * arguments will be processed only if image is not NULL, which will be 920987053a3SArvind Sankar * the case only if we were loaded via the PE entry point. 921ec93fc37SArd Biesheuvel */ 922f4dc7fffSArd Biesheuvel status = efi_load_initrd(image, hdr->initrd_addr_max, ULONG_MAX, 923f4dc7fffSArd Biesheuvel &initrd); 92420287d56SArd Biesheuvel if (status != EFI_SUCCESS) 925ec93fc37SArd Biesheuvel goto fail; 926f4dc7fffSArd Biesheuvel if (initrd && initrd->size > 0) { 927f4dc7fffSArd Biesheuvel efi_set_u64_split(initrd->base, &hdr->ramdisk_image, 928eed4e019SArvind Sankar &boot_params->ext_ramdisk_image); 929f4dc7fffSArd Biesheuvel efi_set_u64_split(initrd->size, &hdr->ramdisk_size, 930eed4e019SArvind Sankar &boot_params->ext_ramdisk_size); 93179d3219dSArd Biesheuvel } 932ec93fc37SArd Biesheuvel 933f4dc7fffSArd Biesheuvel 934ec93fc37SArd Biesheuvel /* 935c2d0b470SArd Biesheuvel * If the boot loader gave us a value for secure_boot then we use that, 936c2d0b470SArd Biesheuvel * otherwise we ask the BIOS. 937c2d0b470SArd Biesheuvel */ 938c2d0b470SArd Biesheuvel if (boot_params->secure_boot == efi_secureboot_mode_unset) 939c2d0b470SArd Biesheuvel boot_params->secure_boot = efi_get_secureboot(); 940c2d0b470SArd Biesheuvel 941c2d0b470SArd Biesheuvel /* Ask the firmware to clear memory on unclean shutdown */ 942c2d0b470SArd Biesheuvel efi_enable_reset_attack_mitigation(); 943c2d0b470SArd Biesheuvel 944c2d0b470SArd Biesheuvel efi_random_get_seed(); 945c2d0b470SArd Biesheuvel 946c2d0b470SArd Biesheuvel efi_retrieve_tpm2_eventlog(); 947c2d0b470SArd Biesheuvel 948c2d0b470SArd Biesheuvel setup_graphics(boot_params); 949c2d0b470SArd Biesheuvel 950c2d0b470SArd Biesheuvel setup_efi_pci(boot_params); 951c2d0b470SArd Biesheuvel 95282e0d6d7SBaskov Evgeniy setup_quirks(boot_params, bzimage_addr, buffer_end - buffer_start); 953c2d0b470SArd Biesheuvel 954c0461bd1SDionna Glaze setup_unaccepted_memory(); 955c0461bd1SDionna Glaze 956c2d0b470SArd Biesheuvel status = exit_boot(boot_params, handle); 957c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 95836bdd0a7SArvind Sankar efi_err("exit_boot() failed!\n"); 959c2d0b470SArd Biesheuvel goto fail; 960c2d0b470SArd Biesheuvel } 961c2d0b470SArd Biesheuvel 962*d2d7a54fSArd Biesheuvel if (IS_ENABLED(CONFIG_X86_64)) 963*d2d7a54fSArd Biesheuvel bzimage_addr += startup_64 - startup_32; 964*d2d7a54fSArd Biesheuvel 965*d2d7a54fSArd Biesheuvel enter_kernel(bzimage_addr, boot_params); 966c2d0b470SArd Biesheuvel fail: 96736bdd0a7SArvind Sankar efi_err("efi_main() failed!\n"); 968c2d0b470SArd Biesheuvel 9693b8f44fcSArd Biesheuvel efi_exit(handle, status); 970c2d0b470SArd Biesheuvel } 971