1c2d0b470SArd Biesheuvel // SPDX-License-Identifier: GPL-2.0-only 2c2d0b470SArd Biesheuvel 3c2d0b470SArd Biesheuvel /* ----------------------------------------------------------------------- 4c2d0b470SArd Biesheuvel * 5c2d0b470SArd Biesheuvel * Copyright 2011 Intel Corporation; author Matt Fleming 6c2d0b470SArd Biesheuvel * 7c2d0b470SArd Biesheuvel * ----------------------------------------------------------------------- */ 8c2d0b470SArd Biesheuvel 9c2d0b470SArd Biesheuvel #include <linux/efi.h> 10c2d0b470SArd Biesheuvel #include <linux/pci.h> 1159476f80SArvind Sankar #include <linux/stddef.h> 12c2d0b470SArd Biesheuvel 13c2d0b470SArd Biesheuvel #include <asm/efi.h> 14c2d0b470SArd Biesheuvel #include <asm/e820/types.h> 15c2d0b470SArd Biesheuvel #include <asm/setup.h> 16c2d0b470SArd Biesheuvel #include <asm/desc.h> 17c2d0b470SArd Biesheuvel #include <asm/boot.h> 18a1b87d54SArd Biesheuvel #include <asm/kaslr.h> 1931c77a50SArd Biesheuvel #include <asm/sev.h> 20c2d0b470SArd Biesheuvel 21c2d0b470SArd Biesheuvel #include "efistub.h" 22cb1c9e02SArd Biesheuvel #include "x86-stub.h" 23c2d0b470SArd Biesheuvel 24ae863aa1SArd Biesheuvel extern char _bss[], _ebss[]; 25ae863aa1SArd Biesheuvel 26ccc27ae7SArd Biesheuvel const efi_system_table_t *efi_system_table; 273ba75c13SBaskov Evgeniy const efi_dxe_services_table_t *efi_dxe_table; 28987053a3SArvind Sankar static efi_loaded_image_t *image = NULL; 2911078876SArd Biesheuvel static efi_memory_attribute_protocol_t *memattr; 30c2d0b470SArd Biesheuvel 31c0461bd1SDionna Glaze typedef union sev_memory_acceptance_protocol sev_memory_acceptance_protocol_t; 32c0461bd1SDionna Glaze union sev_memory_acceptance_protocol { 33c0461bd1SDionna Glaze struct { 34c0461bd1SDionna Glaze efi_status_t (__efiapi * allow_unaccepted_memory)( 35c0461bd1SDionna Glaze sev_memory_acceptance_protocol_t *); 36c0461bd1SDionna Glaze }; 37c0461bd1SDionna Glaze struct { 38c0461bd1SDionna Glaze u32 allow_unaccepted_memory; 39c0461bd1SDionna Glaze } mixed_mode; 40c0461bd1SDionna Glaze }; 41c0461bd1SDionna Glaze 42c2d0b470SArd Biesheuvel static efi_status_t 43c2d0b470SArd Biesheuvel preserve_pci_rom_image(efi_pci_io_protocol_t *pci, struct pci_setup_rom **__rom) 44c2d0b470SArd Biesheuvel { 45c2d0b470SArd Biesheuvel struct pci_setup_rom *rom = NULL; 46c2d0b470SArd Biesheuvel efi_status_t status; 47c2d0b470SArd Biesheuvel unsigned long size; 48c2d0b470SArd Biesheuvel uint64_t romsize; 49c2d0b470SArd Biesheuvel void *romimage; 50c2d0b470SArd Biesheuvel 51c2d0b470SArd Biesheuvel /* 52c2d0b470SArd Biesheuvel * Some firmware images contain EFI function pointers at the place where 53c2d0b470SArd Biesheuvel * the romimage and romsize fields are supposed to be. Typically the EFI 54c2d0b470SArd Biesheuvel * code is mapped at high addresses, translating to an unrealistically 55c2d0b470SArd Biesheuvel * large romsize. The UEFI spec limits the size of option ROMs to 16 56c2d0b470SArd Biesheuvel * MiB so we reject any ROMs over 16 MiB in size to catch this. 57c2d0b470SArd Biesheuvel */ 58c2d0b470SArd Biesheuvel romimage = efi_table_attr(pci, romimage); 59c2d0b470SArd Biesheuvel romsize = efi_table_attr(pci, romsize); 60c2d0b470SArd Biesheuvel if (!romimage || !romsize || romsize > SZ_16M) 61c2d0b470SArd Biesheuvel return EFI_INVALID_PARAMETER; 62c2d0b470SArd Biesheuvel 63c2d0b470SArd Biesheuvel size = romsize + sizeof(*rom); 64c2d0b470SArd Biesheuvel 65c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 66c2d0b470SArd Biesheuvel (void **)&rom); 67c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 6836bdd0a7SArvind Sankar efi_err("Failed to allocate memory for 'rom'\n"); 69c2d0b470SArd Biesheuvel return status; 70c2d0b470SArd Biesheuvel } 71c2d0b470SArd Biesheuvel 72c2d0b470SArd Biesheuvel memset(rom, 0, sizeof(*rom)); 73c2d0b470SArd Biesheuvel 74c2d0b470SArd Biesheuvel rom->data.type = SETUP_PCI; 75c2d0b470SArd Biesheuvel rom->data.len = size - sizeof(struct setup_data); 76c2d0b470SArd Biesheuvel rom->data.next = 0; 778b94da92SMikel Rychliski rom->pcilen = romsize; 78c2d0b470SArd Biesheuvel *__rom = rom; 79c2d0b470SArd Biesheuvel 80c2d0b470SArd Biesheuvel status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16, 81c2d0b470SArd Biesheuvel PCI_VENDOR_ID, 1, &rom->vendor); 82c2d0b470SArd Biesheuvel 83c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 8436bdd0a7SArvind Sankar efi_err("Failed to read rom->vendor\n"); 85c2d0b470SArd Biesheuvel goto free_struct; 86c2d0b470SArd Biesheuvel } 87c2d0b470SArd Biesheuvel 88c2d0b470SArd Biesheuvel status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16, 89c2d0b470SArd Biesheuvel PCI_DEVICE_ID, 1, &rom->devid); 90c2d0b470SArd Biesheuvel 91c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 9236bdd0a7SArvind Sankar efi_err("Failed to read rom->devid\n"); 93c2d0b470SArd Biesheuvel goto free_struct; 94c2d0b470SArd Biesheuvel } 95c2d0b470SArd Biesheuvel 96c2d0b470SArd Biesheuvel status = efi_call_proto(pci, get_location, &rom->segment, &rom->bus, 97c2d0b470SArd Biesheuvel &rom->device, &rom->function); 98c2d0b470SArd Biesheuvel 99c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 100c2d0b470SArd Biesheuvel goto free_struct; 101c2d0b470SArd Biesheuvel 102c2d0b470SArd Biesheuvel memcpy(rom->romdata, romimage, romsize); 103c2d0b470SArd Biesheuvel return status; 104c2d0b470SArd Biesheuvel 105c2d0b470SArd Biesheuvel free_struct: 106c2d0b470SArd Biesheuvel efi_bs_call(free_pool, rom); 107c2d0b470SArd Biesheuvel return status; 108c2d0b470SArd Biesheuvel } 109c2d0b470SArd Biesheuvel 110c2d0b470SArd Biesheuvel /* 111c2d0b470SArd Biesheuvel * There's no way to return an informative status from this function, 112c2d0b470SArd Biesheuvel * because any analysis (and printing of error messages) needs to be 113c2d0b470SArd Biesheuvel * done directly at the EFI function call-site. 114c2d0b470SArd Biesheuvel * 115c2d0b470SArd Biesheuvel * For example, EFI_INVALID_PARAMETER could indicate a bug or maybe we 116c2d0b470SArd Biesheuvel * just didn't find any PCI devices, but there's no way to tell outside 117c2d0b470SArd Biesheuvel * the context of the call. 118c2d0b470SArd Biesheuvel */ 119c2d0b470SArd Biesheuvel static void setup_efi_pci(struct boot_params *params) 120c2d0b470SArd Biesheuvel { 121c2d0b470SArd Biesheuvel efi_status_t status; 122c2d0b470SArd Biesheuvel void **pci_handle = NULL; 123c2d0b470SArd Biesheuvel efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID; 124c2d0b470SArd Biesheuvel unsigned long size = 0; 125c2d0b470SArd Biesheuvel struct setup_data *data; 126c2d0b470SArd Biesheuvel efi_handle_t h; 127c2d0b470SArd Biesheuvel int i; 128c2d0b470SArd Biesheuvel 129c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 130c2d0b470SArd Biesheuvel &pci_proto, NULL, &size, pci_handle); 131c2d0b470SArd Biesheuvel 132c2d0b470SArd Biesheuvel if (status == EFI_BUFFER_TOO_SMALL) { 133c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 134c2d0b470SArd Biesheuvel (void **)&pci_handle); 135c2d0b470SArd Biesheuvel 136c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 13736bdd0a7SArvind Sankar efi_err("Failed to allocate memory for 'pci_handle'\n"); 138c2d0b470SArd Biesheuvel return; 139c2d0b470SArd Biesheuvel } 140c2d0b470SArd Biesheuvel 141c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 142c2d0b470SArd Biesheuvel &pci_proto, NULL, &size, pci_handle); 143c2d0b470SArd Biesheuvel } 144c2d0b470SArd Biesheuvel 145c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 146c2d0b470SArd Biesheuvel goto free_handle; 147c2d0b470SArd Biesheuvel 148c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)params->hdr.setup_data; 149c2d0b470SArd Biesheuvel 150c2d0b470SArd Biesheuvel while (data && data->next) 151c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)data->next; 152c2d0b470SArd Biesheuvel 153c2d0b470SArd Biesheuvel for_each_efi_handle(h, pci_handle, size, i) { 154c2d0b470SArd Biesheuvel efi_pci_io_protocol_t *pci = NULL; 155c2d0b470SArd Biesheuvel struct pci_setup_rom *rom; 156c2d0b470SArd Biesheuvel 157c2d0b470SArd Biesheuvel status = efi_bs_call(handle_protocol, h, &pci_proto, 158c2d0b470SArd Biesheuvel (void **)&pci); 159c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS || !pci) 160c2d0b470SArd Biesheuvel continue; 161c2d0b470SArd Biesheuvel 162c2d0b470SArd Biesheuvel status = preserve_pci_rom_image(pci, &rom); 163c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 164c2d0b470SArd Biesheuvel continue; 165c2d0b470SArd Biesheuvel 166c2d0b470SArd Biesheuvel if (data) 167c2d0b470SArd Biesheuvel data->next = (unsigned long)rom; 168c2d0b470SArd Biesheuvel else 169c2d0b470SArd Biesheuvel params->hdr.setup_data = (unsigned long)rom; 170c2d0b470SArd Biesheuvel 171c2d0b470SArd Biesheuvel data = (struct setup_data *)rom; 172c2d0b470SArd Biesheuvel } 173c2d0b470SArd Biesheuvel 174c2d0b470SArd Biesheuvel free_handle: 175c2d0b470SArd Biesheuvel efi_bs_call(free_pool, pci_handle); 176c2d0b470SArd Biesheuvel } 177c2d0b470SArd Biesheuvel 178c2d0b470SArd Biesheuvel static void retrieve_apple_device_properties(struct boot_params *boot_params) 179c2d0b470SArd Biesheuvel { 180c2d0b470SArd Biesheuvel efi_guid_t guid = APPLE_PROPERTIES_PROTOCOL_GUID; 181c2d0b470SArd Biesheuvel struct setup_data *data, *new; 182c2d0b470SArd Biesheuvel efi_status_t status; 183c2d0b470SArd Biesheuvel u32 size = 0; 184c2d0b470SArd Biesheuvel apple_properties_protocol_t *p; 185c2d0b470SArd Biesheuvel 186c2d0b470SArd Biesheuvel status = efi_bs_call(locate_protocol, &guid, NULL, (void **)&p); 187c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 188c2d0b470SArd Biesheuvel return; 189c2d0b470SArd Biesheuvel 190c2d0b470SArd Biesheuvel if (efi_table_attr(p, version) != 0x10000) { 19136bdd0a7SArvind Sankar efi_err("Unsupported properties proto version\n"); 192c2d0b470SArd Biesheuvel return; 193c2d0b470SArd Biesheuvel } 194c2d0b470SArd Biesheuvel 195c2d0b470SArd Biesheuvel efi_call_proto(p, get_all, NULL, &size); 196c2d0b470SArd Biesheuvel if (!size) 197c2d0b470SArd Biesheuvel return; 198c2d0b470SArd Biesheuvel 199c2d0b470SArd Biesheuvel do { 200c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, 201c2d0b470SArd Biesheuvel size + sizeof(struct setup_data), 202c2d0b470SArd Biesheuvel (void **)&new); 203c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 20436bdd0a7SArvind Sankar efi_err("Failed to allocate memory for 'properties'\n"); 205c2d0b470SArd Biesheuvel return; 206c2d0b470SArd Biesheuvel } 207c2d0b470SArd Biesheuvel 208c2d0b470SArd Biesheuvel status = efi_call_proto(p, get_all, new->data, &size); 209c2d0b470SArd Biesheuvel 210c2d0b470SArd Biesheuvel if (status == EFI_BUFFER_TOO_SMALL) 211c2d0b470SArd Biesheuvel efi_bs_call(free_pool, new); 212c2d0b470SArd Biesheuvel } while (status == EFI_BUFFER_TOO_SMALL); 213c2d0b470SArd Biesheuvel 214c2d0b470SArd Biesheuvel new->type = SETUP_APPLE_PROPERTIES; 215c2d0b470SArd Biesheuvel new->len = size; 216c2d0b470SArd Biesheuvel new->next = 0; 217c2d0b470SArd Biesheuvel 218c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)boot_params->hdr.setup_data; 219c2d0b470SArd Biesheuvel if (!data) { 220c2d0b470SArd Biesheuvel boot_params->hdr.setup_data = (unsigned long)new; 221c2d0b470SArd Biesheuvel } else { 222c2d0b470SArd Biesheuvel while (data->next) 223c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)data->next; 224c2d0b470SArd Biesheuvel data->next = (unsigned long)new; 225c2d0b470SArd Biesheuvel } 226c2d0b470SArd Biesheuvel } 227c2d0b470SArd Biesheuvel 228c756fd5dSArd Biesheuvel efi_status_t efi_adjust_memory_range_protection(unsigned long start, 229cb1c9e02SArd Biesheuvel unsigned long size) 23082e0d6d7SBaskov Evgeniy { 23182e0d6d7SBaskov Evgeniy efi_status_t status; 23282e0d6d7SBaskov Evgeniy efi_gcd_memory_space_desc_t desc; 23382e0d6d7SBaskov Evgeniy unsigned long end, next; 23482e0d6d7SBaskov Evgeniy unsigned long rounded_start, rounded_end; 23582e0d6d7SBaskov Evgeniy unsigned long unprotect_start, unprotect_size; 23682e0d6d7SBaskov Evgeniy 23782e0d6d7SBaskov Evgeniy rounded_start = rounddown(start, EFI_PAGE_SIZE); 23882e0d6d7SBaskov Evgeniy rounded_end = roundup(start + size, EFI_PAGE_SIZE); 23982e0d6d7SBaskov Evgeniy 24011078876SArd Biesheuvel if (memattr != NULL) { 241ccde70aaSArd Biesheuvel status = efi_call_proto(memattr, set_memory_attributes, 242ccde70aaSArd Biesheuvel rounded_start, 243ccde70aaSArd Biesheuvel rounded_end - rounded_start, 244ccde70aaSArd Biesheuvel EFI_MEMORY_RO); 245ccde70aaSArd Biesheuvel if (status != EFI_SUCCESS) { 246ccde70aaSArd Biesheuvel efi_warn("Failed to set EFI_MEMORY_RO attribute\n"); 247ccde70aaSArd Biesheuvel return status; 248ccde70aaSArd Biesheuvel } 249ccde70aaSArd Biesheuvel 250c756fd5dSArd Biesheuvel status = efi_call_proto(memattr, clear_memory_attributes, 251c756fd5dSArd Biesheuvel rounded_start, 252c756fd5dSArd Biesheuvel rounded_end - rounded_start, 253c756fd5dSArd Biesheuvel EFI_MEMORY_XP); 254c756fd5dSArd Biesheuvel if (status != EFI_SUCCESS) 255c756fd5dSArd Biesheuvel efi_warn("Failed to clear EFI_MEMORY_XP attribute\n"); 256c756fd5dSArd Biesheuvel return status; 25711078876SArd Biesheuvel } 25811078876SArd Biesheuvel 25911078876SArd Biesheuvel if (efi_dxe_table == NULL) 260c756fd5dSArd Biesheuvel return EFI_SUCCESS; 26111078876SArd Biesheuvel 26282e0d6d7SBaskov Evgeniy /* 26382e0d6d7SBaskov Evgeniy * Don't modify memory region attributes, they are 26482e0d6d7SBaskov Evgeniy * already suitable, to lower the possibility to 26582e0d6d7SBaskov Evgeniy * encounter firmware bugs. 26682e0d6d7SBaskov Evgeniy */ 26782e0d6d7SBaskov Evgeniy 26882e0d6d7SBaskov Evgeniy for (end = start + size; start < end; start = next) { 26982e0d6d7SBaskov Evgeniy 27082e0d6d7SBaskov Evgeniy status = efi_dxe_call(get_memory_space_descriptor, start, &desc); 27182e0d6d7SBaskov Evgeniy 27282e0d6d7SBaskov Evgeniy if (status != EFI_SUCCESS) 273c756fd5dSArd Biesheuvel break; 27482e0d6d7SBaskov Evgeniy 27582e0d6d7SBaskov Evgeniy next = desc.base_address + desc.length; 27682e0d6d7SBaskov Evgeniy 27782e0d6d7SBaskov Evgeniy /* 27882e0d6d7SBaskov Evgeniy * Only system memory is suitable for trampoline/kernel image placement, 27982e0d6d7SBaskov Evgeniy * so only this type of memory needs its attributes to be modified. 28082e0d6d7SBaskov Evgeniy */ 28182e0d6d7SBaskov Evgeniy 28282e0d6d7SBaskov Evgeniy if (desc.gcd_memory_type != EfiGcdMemoryTypeSystemMemory || 28382e0d6d7SBaskov Evgeniy (desc.attributes & (EFI_MEMORY_RO | EFI_MEMORY_XP)) == 0) 28482e0d6d7SBaskov Evgeniy continue; 28582e0d6d7SBaskov Evgeniy 28682e0d6d7SBaskov Evgeniy unprotect_start = max(rounded_start, (unsigned long)desc.base_address); 28782e0d6d7SBaskov Evgeniy unprotect_size = min(rounded_end, next) - unprotect_start; 28882e0d6d7SBaskov Evgeniy 28982e0d6d7SBaskov Evgeniy status = efi_dxe_call(set_memory_space_attributes, 29082e0d6d7SBaskov Evgeniy unprotect_start, unprotect_size, 29182e0d6d7SBaskov Evgeniy EFI_MEMORY_WB); 29282e0d6d7SBaskov Evgeniy 29382e0d6d7SBaskov Evgeniy if (status != EFI_SUCCESS) { 29431f1a0edSArd Biesheuvel efi_warn("Unable to unprotect memory range [%08lx,%08lx]: %lx\n", 29582e0d6d7SBaskov Evgeniy unprotect_start, 29682e0d6d7SBaskov Evgeniy unprotect_start + unprotect_size, 29731f1a0edSArd Biesheuvel status); 298c756fd5dSArd Biesheuvel break; 29982e0d6d7SBaskov Evgeniy } 30082e0d6d7SBaskov Evgeniy } 301c756fd5dSArd Biesheuvel return EFI_SUCCESS; 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 327800f84d8SArd Biesheuvel static efi_char16_t *efistub_fw_vendor(void) 328800f84d8SArd Biesheuvel { 329800f84d8SArd Biesheuvel unsigned long vendor = efi_table_attr(efi_system_table, fw_vendor); 330800f84d8SArd Biesheuvel 331800f84d8SArd Biesheuvel return (efi_char16_t *)vendor; 332800f84d8SArd Biesheuvel } 333800f84d8SArd Biesheuvel 334c2d0b470SArd Biesheuvel static const efi_char16_t apple[] = L"Apple"; 335c2d0b470SArd Biesheuvel 336a1b87d54SArd Biesheuvel static void setup_quirks(struct boot_params *boot_params) 337c2d0b470SArd Biesheuvel { 338800f84d8SArd Biesheuvel if (IS_ENABLED(CONFIG_APPLE_PROPERTIES) && 339800f84d8SArd Biesheuvel !memcmp(efistub_fw_vendor(), apple, sizeof(apple))) 340c2d0b470SArd Biesheuvel retrieve_apple_device_properties(boot_params); 341c2d0b470SArd Biesheuvel } 342c2d0b470SArd Biesheuvel 343c2d0b470SArd Biesheuvel /* 344c2d0b470SArd Biesheuvel * See if we have Universal Graphics Adapter (UGA) protocol 345c2d0b470SArd Biesheuvel */ 346c2d0b470SArd Biesheuvel static efi_status_t 347c2d0b470SArd Biesheuvel setup_uga(struct screen_info *si, efi_guid_t *uga_proto, unsigned long size) 348c2d0b470SArd Biesheuvel { 349c2d0b470SArd Biesheuvel efi_status_t status; 350c2d0b470SArd Biesheuvel u32 width, height; 351c2d0b470SArd Biesheuvel void **uga_handle = NULL; 352c2d0b470SArd Biesheuvel efi_uga_draw_protocol_t *uga = NULL, *first_uga; 353c2d0b470SArd Biesheuvel efi_handle_t handle; 354c2d0b470SArd Biesheuvel int i; 355c2d0b470SArd Biesheuvel 356c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 357c2d0b470SArd Biesheuvel (void **)&uga_handle); 358c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 359c2d0b470SArd Biesheuvel return status; 360c2d0b470SArd Biesheuvel 361c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 362c2d0b470SArd Biesheuvel uga_proto, NULL, &size, uga_handle); 363c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 364c2d0b470SArd Biesheuvel goto free_handle; 365c2d0b470SArd Biesheuvel 366c2d0b470SArd Biesheuvel height = 0; 367c2d0b470SArd Biesheuvel width = 0; 368c2d0b470SArd Biesheuvel 369c2d0b470SArd Biesheuvel first_uga = NULL; 370c2d0b470SArd Biesheuvel for_each_efi_handle(handle, uga_handle, size, i) { 371c2d0b470SArd Biesheuvel efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID; 372c2d0b470SArd Biesheuvel u32 w, h, depth, refresh; 373c2d0b470SArd Biesheuvel void *pciio; 374c2d0b470SArd Biesheuvel 375c2d0b470SArd Biesheuvel status = efi_bs_call(handle_protocol, handle, uga_proto, 376c2d0b470SArd Biesheuvel (void **)&uga); 377c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 378c2d0b470SArd Biesheuvel continue; 379c2d0b470SArd Biesheuvel 380c2d0b470SArd Biesheuvel pciio = NULL; 381c2d0b470SArd Biesheuvel efi_bs_call(handle_protocol, handle, &pciio_proto, &pciio); 382c2d0b470SArd Biesheuvel 383c2d0b470SArd Biesheuvel status = efi_call_proto(uga, get_mode, &w, &h, &depth, &refresh); 384c2d0b470SArd Biesheuvel if (status == EFI_SUCCESS && (!first_uga || pciio)) { 385c2d0b470SArd Biesheuvel width = w; 386c2d0b470SArd Biesheuvel height = h; 387c2d0b470SArd Biesheuvel 388c2d0b470SArd Biesheuvel /* 389c2d0b470SArd Biesheuvel * Once we've found a UGA supporting PCIIO, 390c2d0b470SArd Biesheuvel * don't bother looking any further. 391c2d0b470SArd Biesheuvel */ 392c2d0b470SArd Biesheuvel if (pciio) 393c2d0b470SArd Biesheuvel break; 394c2d0b470SArd Biesheuvel 395c2d0b470SArd Biesheuvel first_uga = uga; 396c2d0b470SArd Biesheuvel } 397c2d0b470SArd Biesheuvel } 398c2d0b470SArd Biesheuvel 399c2d0b470SArd Biesheuvel if (!width && !height) 400c2d0b470SArd Biesheuvel goto free_handle; 401c2d0b470SArd Biesheuvel 402c2d0b470SArd Biesheuvel /* EFI framebuffer */ 403c2d0b470SArd Biesheuvel si->orig_video_isVGA = VIDEO_TYPE_EFI; 404c2d0b470SArd Biesheuvel 405c2d0b470SArd Biesheuvel si->lfb_depth = 32; 406c2d0b470SArd Biesheuvel si->lfb_width = width; 407c2d0b470SArd Biesheuvel si->lfb_height = height; 408c2d0b470SArd Biesheuvel 409c2d0b470SArd Biesheuvel si->red_size = 8; 410c2d0b470SArd Biesheuvel si->red_pos = 16; 411c2d0b470SArd Biesheuvel si->green_size = 8; 412c2d0b470SArd Biesheuvel si->green_pos = 8; 413c2d0b470SArd Biesheuvel si->blue_size = 8; 414c2d0b470SArd Biesheuvel si->blue_pos = 0; 415c2d0b470SArd Biesheuvel si->rsvd_size = 8; 416c2d0b470SArd Biesheuvel si->rsvd_pos = 24; 417c2d0b470SArd Biesheuvel 418c2d0b470SArd Biesheuvel free_handle: 419c2d0b470SArd Biesheuvel efi_bs_call(free_pool, uga_handle); 420c2d0b470SArd Biesheuvel 421c2d0b470SArd Biesheuvel return status; 422c2d0b470SArd Biesheuvel } 423c2d0b470SArd Biesheuvel 424c2d0b470SArd Biesheuvel static void setup_graphics(struct boot_params *boot_params) 425c2d0b470SArd Biesheuvel { 426c2d0b470SArd Biesheuvel efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID; 427c2d0b470SArd Biesheuvel struct screen_info *si; 428c2d0b470SArd Biesheuvel efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID; 429c2d0b470SArd Biesheuvel efi_status_t status; 430c2d0b470SArd Biesheuvel unsigned long size; 431c2d0b470SArd Biesheuvel void **gop_handle = NULL; 432c2d0b470SArd Biesheuvel void **uga_handle = NULL; 433c2d0b470SArd Biesheuvel 434c2d0b470SArd Biesheuvel si = &boot_params->screen_info; 435c2d0b470SArd Biesheuvel memset(si, 0, sizeof(*si)); 436c2d0b470SArd Biesheuvel 437c2d0b470SArd Biesheuvel size = 0; 438c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 439c2d0b470SArd Biesheuvel &graphics_proto, NULL, &size, gop_handle); 440c2d0b470SArd Biesheuvel if (status == EFI_BUFFER_TOO_SMALL) 441c2d0b470SArd Biesheuvel status = efi_setup_gop(si, &graphics_proto, size); 442c2d0b470SArd Biesheuvel 443c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 444c2d0b470SArd Biesheuvel size = 0; 445c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 446c2d0b470SArd Biesheuvel &uga_proto, NULL, &size, uga_handle); 447c2d0b470SArd Biesheuvel if (status == EFI_BUFFER_TOO_SMALL) 448c2d0b470SArd Biesheuvel setup_uga(si, &uga_proto, size); 449c2d0b470SArd Biesheuvel } 450c2d0b470SArd Biesheuvel } 451c2d0b470SArd Biesheuvel 4523b8f44fcSArd Biesheuvel 4533b8f44fcSArd Biesheuvel static void __noreturn efi_exit(efi_handle_t handle, efi_status_t status) 4543b8f44fcSArd Biesheuvel { 4553b8f44fcSArd Biesheuvel efi_bs_call(exit, handle, status, 0, NULL); 456f3fa0efcSArd Biesheuvel for(;;) 457f3fa0efcSArd Biesheuvel asm("hlt"); 4583b8f44fcSArd Biesheuvel } 4593b8f44fcSArd Biesheuvel 460c2d0b470SArd Biesheuvel void __noreturn efi_stub_entry(efi_handle_t handle, 461c2d0b470SArd Biesheuvel efi_system_table_t *sys_table_arg, 462c2d0b470SArd Biesheuvel struct boot_params *boot_params); 463c2d0b470SArd Biesheuvel 464c2d0b470SArd Biesheuvel /* 465c2d0b470SArd Biesheuvel * Because the x86 boot code expects to be passed a boot_params we 466c2d0b470SArd Biesheuvel * need to create one ourselves (usually the bootloader would create 467c2d0b470SArd Biesheuvel * one for us). 468c2d0b470SArd Biesheuvel */ 469c2d0b470SArd Biesheuvel efi_status_t __efiapi efi_pe_entry(efi_handle_t handle, 470c2d0b470SArd Biesheuvel efi_system_table_t *sys_table_arg) 471c2d0b470SArd Biesheuvel { 4728117961dSArd Biesheuvel static struct boot_params boot_params __page_aligned_bss; 4738117961dSArd Biesheuvel struct setup_header *hdr = &boot_params.hdr; 474c2d0b470SArd Biesheuvel efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID; 475c2d0b470SArd Biesheuvel int options_size = 0; 476c2d0b470SArd Biesheuvel efi_status_t status; 477c2d0b470SArd Biesheuvel char *cmdline_ptr; 478c2d0b470SArd Biesheuvel 4795ad5dcfdSArd Biesheuvel if (efi_is_native()) 480ae863aa1SArd Biesheuvel memset(_bss, 0, _ebss - _bss); 481ae863aa1SArd 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 4948117961dSArd Biesheuvel /* Assign the setup_header fields that the kernel actually cares about */ 495c2d0b470SArd Biesheuvel hdr->root_flags = 1; 496c2d0b470SArd Biesheuvel hdr->vid_mode = 0xffff; 497c2d0b470SArd Biesheuvel 498c2d0b470SArd Biesheuvel hdr->type_of_loader = 0x21; 4995110da79SArd Biesheuvel hdr->initrd_addr_max = INT_MAX; 500c2d0b470SArd Biesheuvel 501c2d0b470SArd Biesheuvel /* Convert unicode cmdline to ascii */ 50227cd5511SArd Biesheuvel cmdline_ptr = efi_convert_cmdline(image, &options_size); 503c2d0b470SArd Biesheuvel if (!cmdline_ptr) 504c2d0b470SArd Biesheuvel goto fail; 505c2d0b470SArd Biesheuvel 5068117961dSArd Biesheuvel efi_set_u64_split((unsigned long)cmdline_ptr, &hdr->cmd_line_ptr, 5078117961dSArd Biesheuvel &boot_params.ext_cmd_line_ptr); 508c2d0b470SArd Biesheuvel 5098117961dSArd Biesheuvel efi_stub_entry(handle, sys_table_arg, &boot_params); 510c2d0b470SArd Biesheuvel /* not reached */ 511c2d0b470SArd Biesheuvel 512c2d0b470SArd Biesheuvel fail: 5133b8f44fcSArd Biesheuvel efi_exit(handle, status); 514c2d0b470SArd Biesheuvel } 515c2d0b470SArd Biesheuvel 516c2d0b470SArd Biesheuvel static void add_e820ext(struct boot_params *params, 517c2d0b470SArd Biesheuvel struct setup_data *e820ext, u32 nr_entries) 518c2d0b470SArd Biesheuvel { 519c2d0b470SArd Biesheuvel struct setup_data *data; 520c2d0b470SArd Biesheuvel 521c2d0b470SArd Biesheuvel e820ext->type = SETUP_E820_EXT; 522c2d0b470SArd Biesheuvel e820ext->len = nr_entries * sizeof(struct boot_e820_entry); 523c2d0b470SArd Biesheuvel e820ext->next = 0; 524c2d0b470SArd Biesheuvel 525c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)params->hdr.setup_data; 526c2d0b470SArd Biesheuvel 527c2d0b470SArd Biesheuvel while (data && data->next) 528c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)data->next; 529c2d0b470SArd Biesheuvel 530c2d0b470SArd Biesheuvel if (data) 531c2d0b470SArd Biesheuvel data->next = (unsigned long)e820ext; 532c2d0b470SArd Biesheuvel else 533c2d0b470SArd Biesheuvel params->hdr.setup_data = (unsigned long)e820ext; 534c2d0b470SArd Biesheuvel } 535c2d0b470SArd Biesheuvel 536c2d0b470SArd Biesheuvel static efi_status_t 537c2d0b470SArd Biesheuvel setup_e820(struct boot_params *params, struct setup_data *e820ext, u32 e820ext_size) 538c2d0b470SArd Biesheuvel { 539c2d0b470SArd Biesheuvel struct boot_e820_entry *entry = params->e820_table; 540c2d0b470SArd Biesheuvel struct efi_info *efi = ¶ms->efi_info; 541c2d0b470SArd Biesheuvel struct boot_e820_entry *prev = NULL; 542c2d0b470SArd Biesheuvel u32 nr_entries; 543c2d0b470SArd Biesheuvel u32 nr_desc; 544c2d0b470SArd Biesheuvel int i; 545c2d0b470SArd Biesheuvel 546c2d0b470SArd Biesheuvel nr_entries = 0; 547c2d0b470SArd Biesheuvel nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size; 548c2d0b470SArd Biesheuvel 549c2d0b470SArd Biesheuvel for (i = 0; i < nr_desc; i++) { 550c2d0b470SArd Biesheuvel efi_memory_desc_t *d; 551c2d0b470SArd Biesheuvel unsigned int e820_type = 0; 552c2d0b470SArd Biesheuvel unsigned long m = efi->efi_memmap; 553c2d0b470SArd Biesheuvel 554c2d0b470SArd Biesheuvel #ifdef CONFIG_X86_64 555c2d0b470SArd Biesheuvel m |= (u64)efi->efi_memmap_hi << 32; 556c2d0b470SArd Biesheuvel #endif 557c2d0b470SArd Biesheuvel 558c2d0b470SArd Biesheuvel d = efi_early_memdesc_ptr(m, efi->efi_memdesc_size, i); 559c2d0b470SArd Biesheuvel switch (d->type) { 560c2d0b470SArd Biesheuvel case EFI_RESERVED_TYPE: 561c2d0b470SArd Biesheuvel case EFI_RUNTIME_SERVICES_CODE: 562c2d0b470SArd Biesheuvel case EFI_RUNTIME_SERVICES_DATA: 563c2d0b470SArd Biesheuvel case EFI_MEMORY_MAPPED_IO: 564c2d0b470SArd Biesheuvel case EFI_MEMORY_MAPPED_IO_PORT_SPACE: 565c2d0b470SArd Biesheuvel case EFI_PAL_CODE: 566c2d0b470SArd Biesheuvel e820_type = E820_TYPE_RESERVED; 567c2d0b470SArd Biesheuvel break; 568c2d0b470SArd Biesheuvel 569c2d0b470SArd Biesheuvel case EFI_UNUSABLE_MEMORY: 570c2d0b470SArd Biesheuvel e820_type = E820_TYPE_UNUSABLE; 571c2d0b470SArd Biesheuvel break; 572c2d0b470SArd Biesheuvel 573c2d0b470SArd Biesheuvel case EFI_ACPI_RECLAIM_MEMORY: 574c2d0b470SArd Biesheuvel e820_type = E820_TYPE_ACPI; 575c2d0b470SArd Biesheuvel break; 576c2d0b470SArd Biesheuvel 577c2d0b470SArd Biesheuvel case EFI_LOADER_CODE: 578c2d0b470SArd Biesheuvel case EFI_LOADER_DATA: 579c2d0b470SArd Biesheuvel case EFI_BOOT_SERVICES_CODE: 580c2d0b470SArd Biesheuvel case EFI_BOOT_SERVICES_DATA: 581c2d0b470SArd Biesheuvel case EFI_CONVENTIONAL_MEMORY: 582c2d0b470SArd Biesheuvel if (efi_soft_reserve_enabled() && 583c2d0b470SArd Biesheuvel (d->attribute & EFI_MEMORY_SP)) 584c2d0b470SArd Biesheuvel e820_type = E820_TYPE_SOFT_RESERVED; 585c2d0b470SArd Biesheuvel else 586c2d0b470SArd Biesheuvel e820_type = E820_TYPE_RAM; 587c2d0b470SArd Biesheuvel break; 588c2d0b470SArd Biesheuvel 589c2d0b470SArd Biesheuvel case EFI_ACPI_MEMORY_NVS: 590c2d0b470SArd Biesheuvel e820_type = E820_TYPE_NVS; 591c2d0b470SArd Biesheuvel break; 592c2d0b470SArd Biesheuvel 593c2d0b470SArd Biesheuvel case EFI_PERSISTENT_MEMORY: 594c2d0b470SArd Biesheuvel e820_type = E820_TYPE_PMEM; 595c2d0b470SArd Biesheuvel break; 596c2d0b470SArd Biesheuvel 597745e3ed8SKirill A. Shutemov case EFI_UNACCEPTED_MEMORY: 598ff07186bSNikolay Borisov if (!IS_ENABLED(CONFIG_UNACCEPTED_MEMORY)) 599745e3ed8SKirill A. Shutemov continue; 600745e3ed8SKirill A. Shutemov e820_type = E820_TYPE_RAM; 601745e3ed8SKirill A. Shutemov process_unaccepted_memory(d->phys_addr, 602745e3ed8SKirill A. Shutemov d->phys_addr + PAGE_SIZE * d->num_pages); 603745e3ed8SKirill A. Shutemov break; 604c2d0b470SArd Biesheuvel default: 605c2d0b470SArd Biesheuvel continue; 606c2d0b470SArd Biesheuvel } 607c2d0b470SArd Biesheuvel 608c2d0b470SArd Biesheuvel /* Merge adjacent mappings */ 609c2d0b470SArd Biesheuvel if (prev && prev->type == e820_type && 610c2d0b470SArd Biesheuvel (prev->addr + prev->size) == d->phys_addr) { 611c2d0b470SArd Biesheuvel prev->size += d->num_pages << 12; 612c2d0b470SArd Biesheuvel continue; 613c2d0b470SArd Biesheuvel } 614c2d0b470SArd Biesheuvel 615c2d0b470SArd Biesheuvel if (nr_entries == ARRAY_SIZE(params->e820_table)) { 616c2d0b470SArd Biesheuvel u32 need = (nr_desc - i) * sizeof(struct e820_entry) + 617c2d0b470SArd Biesheuvel sizeof(struct setup_data); 618c2d0b470SArd Biesheuvel 619c2d0b470SArd Biesheuvel if (!e820ext || e820ext_size < need) 620c2d0b470SArd Biesheuvel return EFI_BUFFER_TOO_SMALL; 621c2d0b470SArd Biesheuvel 622c2d0b470SArd Biesheuvel /* boot_params map full, switch to e820 extended */ 623c2d0b470SArd Biesheuvel entry = (struct boot_e820_entry *)e820ext->data; 624c2d0b470SArd Biesheuvel } 625c2d0b470SArd Biesheuvel 626c2d0b470SArd Biesheuvel entry->addr = d->phys_addr; 627c2d0b470SArd Biesheuvel entry->size = d->num_pages << PAGE_SHIFT; 628c2d0b470SArd Biesheuvel entry->type = e820_type; 629c2d0b470SArd Biesheuvel prev = entry++; 630c2d0b470SArd Biesheuvel nr_entries++; 631c2d0b470SArd Biesheuvel } 632c2d0b470SArd Biesheuvel 633c2d0b470SArd Biesheuvel if (nr_entries > ARRAY_SIZE(params->e820_table)) { 634c2d0b470SArd Biesheuvel u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_table); 635c2d0b470SArd Biesheuvel 636c2d0b470SArd Biesheuvel add_e820ext(params, e820ext, nr_e820ext); 637c2d0b470SArd Biesheuvel nr_entries -= nr_e820ext; 638c2d0b470SArd Biesheuvel } 639c2d0b470SArd Biesheuvel 640c2d0b470SArd Biesheuvel params->e820_entries = (u8)nr_entries; 641c2d0b470SArd Biesheuvel 642c2d0b470SArd Biesheuvel return EFI_SUCCESS; 643c2d0b470SArd Biesheuvel } 644c2d0b470SArd Biesheuvel 645c2d0b470SArd Biesheuvel static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext, 646c2d0b470SArd Biesheuvel u32 *e820ext_size) 647c2d0b470SArd Biesheuvel { 648c2d0b470SArd Biesheuvel efi_status_t status; 649c2d0b470SArd Biesheuvel unsigned long size; 650c2d0b470SArd Biesheuvel 651c2d0b470SArd Biesheuvel size = sizeof(struct setup_data) + 652c2d0b470SArd Biesheuvel sizeof(struct e820_entry) * nr_desc; 653c2d0b470SArd Biesheuvel 654c2d0b470SArd Biesheuvel if (*e820ext) { 655c2d0b470SArd Biesheuvel efi_bs_call(free_pool, *e820ext); 656c2d0b470SArd Biesheuvel *e820ext = NULL; 657c2d0b470SArd Biesheuvel *e820ext_size = 0; 658c2d0b470SArd Biesheuvel } 659c2d0b470SArd Biesheuvel 660c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 661c2d0b470SArd Biesheuvel (void **)e820ext); 662c2d0b470SArd Biesheuvel if (status == EFI_SUCCESS) 663c2d0b470SArd Biesheuvel *e820ext_size = size; 664c2d0b470SArd Biesheuvel 665c2d0b470SArd Biesheuvel return status; 666c2d0b470SArd Biesheuvel } 667c2d0b470SArd Biesheuvel 668c2d0b470SArd Biesheuvel static efi_status_t allocate_e820(struct boot_params *params, 669c2d0b470SArd Biesheuvel struct setup_data **e820ext, 670c2d0b470SArd Biesheuvel u32 *e820ext_size) 671c2d0b470SArd Biesheuvel { 6722e9f46eeSKirill A. Shutemov struct efi_boot_memmap *map; 673c2d0b470SArd Biesheuvel efi_status_t status; 6742e9f46eeSKirill A. Shutemov __u32 nr_desc; 675c2d0b470SArd Biesheuvel 6762e9f46eeSKirill A. Shutemov status = efi_get_memory_map(&map, false); 677c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 678c2d0b470SArd Biesheuvel return status; 6792e9f46eeSKirill A. Shutemov 6802e9f46eeSKirill A. Shutemov nr_desc = map->map_size / map->desc_size; 6812e9f46eeSKirill A. Shutemov if (nr_desc > ARRAY_SIZE(params->e820_table) - EFI_MMAP_NR_SLACK_SLOTS) { 6822e9f46eeSKirill A. Shutemov u32 nr_e820ext = nr_desc - ARRAY_SIZE(params->e820_table) + 6832e9f46eeSKirill A. Shutemov EFI_MMAP_NR_SLACK_SLOTS; 6842e9f46eeSKirill A. Shutemov 6852e9f46eeSKirill A. Shutemov status = alloc_e820ext(nr_e820ext, e820ext, e820ext_size); 686c2d0b470SArd Biesheuvel } 687c2d0b470SArd Biesheuvel 688745e3ed8SKirill A. Shutemov if (IS_ENABLED(CONFIG_UNACCEPTED_MEMORY) && status == EFI_SUCCESS) 689745e3ed8SKirill A. Shutemov status = allocate_unaccepted_bitmap(nr_desc, map); 690745e3ed8SKirill A. Shutemov 6912e9f46eeSKirill A. Shutemov efi_bs_call(free_pool, map); 6922e9f46eeSKirill A. Shutemov return status; 693c2d0b470SArd Biesheuvel } 694c2d0b470SArd Biesheuvel 695c2d0b470SArd Biesheuvel struct exit_boot_struct { 696c2d0b470SArd Biesheuvel struct boot_params *boot_params; 697c2d0b470SArd Biesheuvel struct efi_info *efi; 698c2d0b470SArd Biesheuvel }; 699c2d0b470SArd Biesheuvel 700c2d0b470SArd Biesheuvel static efi_status_t exit_boot_func(struct efi_boot_memmap *map, 701c2d0b470SArd Biesheuvel void *priv) 702c2d0b470SArd Biesheuvel { 703c2d0b470SArd Biesheuvel const char *signature; 704c2d0b470SArd Biesheuvel struct exit_boot_struct *p = priv; 705c2d0b470SArd Biesheuvel 706c2d0b470SArd Biesheuvel signature = efi_is_64bit() ? EFI64_LOADER_SIGNATURE 707c2d0b470SArd Biesheuvel : EFI32_LOADER_SIGNATURE; 708c2d0b470SArd Biesheuvel memcpy(&p->efi->efi_loader_signature, signature, sizeof(__u32)); 709c2d0b470SArd Biesheuvel 710eed4e019SArvind Sankar efi_set_u64_split((unsigned long)efi_system_table, 711eed4e019SArvind Sankar &p->efi->efi_systab, &p->efi->efi_systab_hi); 712eab31265SArd Biesheuvel p->efi->efi_memdesc_size = map->desc_size; 713eab31265SArd Biesheuvel p->efi->efi_memdesc_version = map->desc_ver; 714eab31265SArd Biesheuvel efi_set_u64_split((unsigned long)map->map, 715eed4e019SArvind Sankar &p->efi->efi_memmap, &p->efi->efi_memmap_hi); 716eab31265SArd Biesheuvel p->efi->efi_memmap_size = map->map_size; 717c2d0b470SArd Biesheuvel 718c2d0b470SArd Biesheuvel return EFI_SUCCESS; 719c2d0b470SArd Biesheuvel } 720c2d0b470SArd Biesheuvel 721c2d0b470SArd Biesheuvel static efi_status_t exit_boot(struct boot_params *boot_params, void *handle) 722c2d0b470SArd Biesheuvel { 723c2d0b470SArd Biesheuvel struct setup_data *e820ext = NULL; 724c2d0b470SArd Biesheuvel __u32 e820ext_size = 0; 725c2d0b470SArd Biesheuvel efi_status_t status; 726c2d0b470SArd Biesheuvel struct exit_boot_struct priv; 727c2d0b470SArd Biesheuvel 728c2d0b470SArd Biesheuvel priv.boot_params = boot_params; 729c2d0b470SArd Biesheuvel priv.efi = &boot_params->efi_info; 730c2d0b470SArd Biesheuvel 731c2d0b470SArd Biesheuvel status = allocate_e820(boot_params, &e820ext, &e820ext_size); 732c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 733c2d0b470SArd Biesheuvel return status; 734c2d0b470SArd Biesheuvel 735c2d0b470SArd Biesheuvel /* Might as well exit boot services now */ 736eab31265SArd Biesheuvel status = efi_exit_boot_services(handle, &priv, exit_boot_func); 737c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 738c2d0b470SArd Biesheuvel return status; 739c2d0b470SArd Biesheuvel 740c2d0b470SArd Biesheuvel /* Historic? */ 741c2d0b470SArd Biesheuvel boot_params->alt_mem_k = 32 * 1024; 742c2d0b470SArd Biesheuvel 743c2d0b470SArd Biesheuvel status = setup_e820(boot_params, e820ext, e820ext_size); 744c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 745c2d0b470SArd Biesheuvel return status; 746c2d0b470SArd Biesheuvel 747c2d0b470SArd Biesheuvel return EFI_SUCCESS; 748c2d0b470SArd Biesheuvel } 749c2d0b470SArd Biesheuvel 75031c77a50SArd Biesheuvel static bool have_unsupported_snp_features(void) 75131c77a50SArd Biesheuvel { 75231c77a50SArd Biesheuvel u64 unsupported; 75331c77a50SArd Biesheuvel 75431c77a50SArd Biesheuvel unsupported = snp_get_unsupported_features(sev_get_status()); 75531c77a50SArd Biesheuvel if (unsupported) { 75631c77a50SArd Biesheuvel efi_err("Unsupported SEV-SNP features detected: 0x%llx\n", 75731c77a50SArd Biesheuvel unsupported); 75831c77a50SArd Biesheuvel return true; 75931c77a50SArd Biesheuvel } 76031c77a50SArd Biesheuvel return false; 76131c77a50SArd Biesheuvel } 76231c77a50SArd Biesheuvel 763a1b87d54SArd Biesheuvel static void efi_get_seed(void *seed, int size) 764a1b87d54SArd Biesheuvel { 765a1b87d54SArd Biesheuvel efi_get_random_bytes(size, seed); 766a1b87d54SArd Biesheuvel 767a1b87d54SArd Biesheuvel /* 768a1b87d54SArd Biesheuvel * This only updates seed[0] when running on 32-bit, but in that case, 769a1b87d54SArd Biesheuvel * seed[1] is not used anyway, as there is no virtual KASLR on 32-bit. 770a1b87d54SArd Biesheuvel */ 771a1b87d54SArd Biesheuvel *(unsigned long *)seed ^= kaslr_get_random_long("EFI"); 772a1b87d54SArd Biesheuvel } 773a1b87d54SArd Biesheuvel 774a1b87d54SArd Biesheuvel static void error(char *str) 775a1b87d54SArd Biesheuvel { 776a1b87d54SArd Biesheuvel efi_warn("Decompression failed: %s\n", str); 777a1b87d54SArd Biesheuvel } 778a1b87d54SArd Biesheuvel 779a1b87d54SArd Biesheuvel static efi_status_t efi_decompress_kernel(unsigned long *kernel_entry) 780a1b87d54SArd Biesheuvel { 781a1b87d54SArd Biesheuvel unsigned long virt_addr = LOAD_PHYSICAL_ADDR; 782a1b87d54SArd Biesheuvel unsigned long addr, alloc_size, entry; 783a1b87d54SArd Biesheuvel efi_status_t status; 784a1b87d54SArd Biesheuvel u32 seed[2] = {}; 785a1b87d54SArd Biesheuvel 786a1b87d54SArd Biesheuvel /* determine the required size of the allocation */ 787a1b87d54SArd Biesheuvel alloc_size = ALIGN(max_t(unsigned long, output_len, kernel_total_size), 788a1b87d54SArd Biesheuvel MIN_KERNEL_ALIGN); 789a1b87d54SArd Biesheuvel 790a1b87d54SArd Biesheuvel if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && !efi_nokaslr) { 791a1b87d54SArd Biesheuvel u64 range = KERNEL_IMAGE_SIZE - LOAD_PHYSICAL_ADDR - kernel_total_size; 792800f84d8SArd Biesheuvel static const efi_char16_t ami[] = L"American Megatrends"; 793a1b87d54SArd Biesheuvel 794a1b87d54SArd Biesheuvel efi_get_seed(seed, sizeof(seed)); 795a1b87d54SArd Biesheuvel 796a1b87d54SArd Biesheuvel virt_addr += (range * seed[1]) >> 32; 797a1b87d54SArd Biesheuvel virt_addr &= ~(CONFIG_PHYSICAL_ALIGN - 1); 798800f84d8SArd Biesheuvel 799800f84d8SArd Biesheuvel /* 800800f84d8SArd Biesheuvel * Older Dell systems with AMI UEFI firmware v2.0 may hang 801800f84d8SArd Biesheuvel * while decompressing the kernel if physical address 802800f84d8SArd Biesheuvel * randomization is enabled. 803800f84d8SArd Biesheuvel * 804800f84d8SArd Biesheuvel * https://bugzilla.kernel.org/show_bug.cgi?id=218173 805800f84d8SArd Biesheuvel */ 806800f84d8SArd Biesheuvel if (efi_system_table->hdr.revision <= EFI_2_00_SYSTEM_TABLE_REVISION && 807800f84d8SArd Biesheuvel !memcmp(efistub_fw_vendor(), ami, sizeof(ami))) { 808800f84d8SArd Biesheuvel efi_debug("AMI firmware v2.0 or older detected - disabling physical KASLR\n"); 809800f84d8SArd Biesheuvel seed[0] = 0; 810800f84d8SArd Biesheuvel } 811a1b87d54SArd Biesheuvel } 812a1b87d54SArd Biesheuvel 813a1b87d54SArd Biesheuvel status = efi_random_alloc(alloc_size, CONFIG_PHYSICAL_ALIGN, &addr, 814a1b87d54SArd Biesheuvel seed[0], EFI_LOADER_CODE, 8150e7ca435SArd Biesheuvel LOAD_PHYSICAL_ADDR, 816a1b87d54SArd Biesheuvel EFI_X86_KERNEL_ALLOC_LIMIT); 817a1b87d54SArd Biesheuvel if (status != EFI_SUCCESS) 818a1b87d54SArd Biesheuvel return status; 819a1b87d54SArd Biesheuvel 820a1b87d54SArd Biesheuvel entry = decompress_kernel((void *)addr, virt_addr, error); 821a1b87d54SArd Biesheuvel if (entry == ULONG_MAX) { 822a1b87d54SArd Biesheuvel efi_free(alloc_size, addr); 823a1b87d54SArd Biesheuvel return EFI_LOAD_ERROR; 824a1b87d54SArd Biesheuvel } 825a1b87d54SArd Biesheuvel 826a1b87d54SArd Biesheuvel *kernel_entry = addr + entry; 827a1b87d54SArd Biesheuvel 828ccde70aaSArd Biesheuvel return efi_adjust_memory_range_protection(addr, kernel_text_size); 829a1b87d54SArd Biesheuvel } 830a1b87d54SArd Biesheuvel 831d2d7a54fSArd Biesheuvel static void __noreturn enter_kernel(unsigned long kernel_addr, 832d2d7a54fSArd Biesheuvel struct boot_params *boot_params) 833d2d7a54fSArd Biesheuvel { 834d2d7a54fSArd Biesheuvel /* enter decompressed kernel with boot_params pointer in RSI/ESI */ 835d2d7a54fSArd Biesheuvel asm("jmp *%0"::"r"(kernel_addr), "S"(boot_params)); 836d2d7a54fSArd Biesheuvel 837d2d7a54fSArd Biesheuvel unreachable(); 838d2d7a54fSArd Biesheuvel } 839d2d7a54fSArd Biesheuvel 840c2d0b470SArd Biesheuvel /* 841d2d7a54fSArd Biesheuvel * On success, this routine will jump to the relocated image directly and never 842d2d7a54fSArd Biesheuvel * return. On failure, it will exit to the firmware via efi_exit() instead of 843d2d7a54fSArd Biesheuvel * returning. 844c2d0b470SArd Biesheuvel */ 845df9215f1SArd Biesheuvel void __noreturn efi_stub_entry(efi_handle_t handle, 846c2d0b470SArd Biesheuvel efi_system_table_t *sys_table_arg, 847c2d0b470SArd Biesheuvel struct boot_params *boot_params) 848c2d0b470SArd Biesheuvel { 84911078876SArd Biesheuvel efi_guid_t guid = EFI_MEMORY_ATTRIBUTE_PROTOCOL_GUID; 850c2d0b470SArd Biesheuvel struct setup_header *hdr = &boot_params->hdr; 851f4dc7fffSArd Biesheuvel const struct linux_efi_initrd *initrd = NULL; 852a1b87d54SArd Biesheuvel unsigned long kernel_entry; 853c2d0b470SArd Biesheuvel efi_status_t status; 854c2d0b470SArd Biesheuvel 855db772413SArd Biesheuvel boot_params_pointer = boot_params; 856db772413SArd Biesheuvel 857ccc27ae7SArd Biesheuvel efi_system_table = sys_table_arg; 858c2d0b470SArd Biesheuvel /* Check if we were booted by the EFI firmware */ 859ccc27ae7SArd Biesheuvel if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) 8603b8f44fcSArd Biesheuvel efi_exit(handle, EFI_INVALID_PARAMETER); 861c2d0b470SArd Biesheuvel 86231c77a50SArd Biesheuvel if (have_unsupported_snp_features()) 86331c77a50SArd Biesheuvel efi_exit(handle, EFI_UNSUPPORTED); 86431c77a50SArd Biesheuvel 86511078876SArd Biesheuvel if (IS_ENABLED(CONFIG_EFI_DXE_MEM_ATTRIBUTES)) { 8663ba75c13SBaskov Evgeniy efi_dxe_table = get_efi_config_table(EFI_DXE_SERVICES_TABLE_GUID); 8673ba75c13SBaskov Evgeniy if (efi_dxe_table && 8683ba75c13SBaskov Evgeniy efi_dxe_table->hdr.signature != EFI_DXE_SERVICES_TABLE_SIGNATURE) { 8693ba75c13SBaskov Evgeniy efi_warn("Ignoring DXE services table: invalid signature\n"); 8703ba75c13SBaskov Evgeniy efi_dxe_table = NULL; 8713ba75c13SBaskov Evgeniy } 87211078876SArd Biesheuvel } 87311078876SArd Biesheuvel 87411078876SArd Biesheuvel /* grab the memory attributes protocol if it exists */ 87511078876SArd Biesheuvel efi_bs_call(locate_protocol, &guid, NULL, (void **)&memattr); 8763ba75c13SBaskov Evgeniy 877cb1c9e02SArd Biesheuvel status = efi_setup_5level_paging(); 878cb1c9e02SArd Biesheuvel if (status != EFI_SUCCESS) { 879cb1c9e02SArd Biesheuvel efi_err("efi_setup_5level_paging() failed!\n"); 880cb1c9e02SArd Biesheuvel goto fail; 881cb1c9e02SArd Biesheuvel } 882cb1c9e02SArd Biesheuvel 8837dde67f2SArvind Sankar #ifdef CONFIG_CMDLINE_BOOL 884055042beSArvind Sankar status = efi_parse_options(CONFIG_CMDLINE); 885055042beSArvind Sankar if (status != EFI_SUCCESS) { 886055042beSArvind Sankar efi_err("Failed to parse options\n"); 887055042beSArvind Sankar goto fail; 888055042beSArvind Sankar } 8897dde67f2SArvind Sankar #endif 8907dde67f2SArvind Sankar if (!IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) { 8917dde67f2SArvind Sankar unsigned long cmdline_paddr = ((u64)hdr->cmd_line_ptr | 892c2d0b470SArd Biesheuvel ((u64)boot_params->ext_cmd_line_ptr << 32)); 893055042beSArvind Sankar status = efi_parse_options((char *)cmdline_paddr); 894055042beSArvind Sankar if (status != EFI_SUCCESS) { 895055042beSArvind Sankar efi_err("Failed to parse options\n"); 896055042beSArvind Sankar goto fail; 897055042beSArvind Sankar } 8987dde67f2SArvind Sankar } 899c2d0b470SArd Biesheuvel 900*04654531SArd Biesheuvel if (efi_mem_encrypt > 0) 901*04654531SArd Biesheuvel hdr->xloadflags |= XLF_MEM_ENCRYPTION; 902*04654531SArd Biesheuvel 903a1b87d54SArd Biesheuvel status = efi_decompress_kernel(&kernel_entry); 904a1b87d54SArd Biesheuvel if (status != EFI_SUCCESS) { 905a1b87d54SArd Biesheuvel efi_err("Failed to decompress kernel\n"); 906a1b87d54SArd Biesheuvel goto fail; 907a1b87d54SArd Biesheuvel } 908a1b87d54SArd Biesheuvel 909c2d0b470SArd Biesheuvel /* 910987053a3SArvind Sankar * At this point, an initrd may already have been loaded by the 911987053a3SArvind Sankar * bootloader and passed via bootparams. We permit an initrd loaded 912987053a3SArvind Sankar * from the LINUX_EFI_INITRD_MEDIA_GUID device path to supersede it. 913987053a3SArvind Sankar * 914987053a3SArvind Sankar * If the device path is not present, any command-line initrd= 915987053a3SArvind Sankar * arguments will be processed only if image is not NULL, which will be 916987053a3SArvind Sankar * the case only if we were loaded via the PE entry point. 917ec93fc37SArd Biesheuvel */ 918f4dc7fffSArd Biesheuvel status = efi_load_initrd(image, hdr->initrd_addr_max, ULONG_MAX, 919f4dc7fffSArd Biesheuvel &initrd); 92020287d56SArd Biesheuvel if (status != EFI_SUCCESS) 921ec93fc37SArd Biesheuvel goto fail; 922f4dc7fffSArd Biesheuvel if (initrd && initrd->size > 0) { 923f4dc7fffSArd Biesheuvel efi_set_u64_split(initrd->base, &hdr->ramdisk_image, 924eed4e019SArvind Sankar &boot_params->ext_ramdisk_image); 925f4dc7fffSArd Biesheuvel efi_set_u64_split(initrd->size, &hdr->ramdisk_size, 926eed4e019SArvind Sankar &boot_params->ext_ramdisk_size); 92779d3219dSArd Biesheuvel } 928ec93fc37SArd Biesheuvel 929f4dc7fffSArd Biesheuvel 930ec93fc37SArd Biesheuvel /* 931c2d0b470SArd Biesheuvel * If the boot loader gave us a value for secure_boot then we use that, 932c2d0b470SArd Biesheuvel * otherwise we ask the BIOS. 933c2d0b470SArd Biesheuvel */ 934c2d0b470SArd Biesheuvel if (boot_params->secure_boot == efi_secureboot_mode_unset) 935c2d0b470SArd Biesheuvel boot_params->secure_boot = efi_get_secureboot(); 936c2d0b470SArd Biesheuvel 937c2d0b470SArd Biesheuvel /* Ask the firmware to clear memory on unclean shutdown */ 938c2d0b470SArd Biesheuvel efi_enable_reset_attack_mitigation(); 939c2d0b470SArd Biesheuvel 940c2d0b470SArd Biesheuvel efi_random_get_seed(); 941c2d0b470SArd Biesheuvel 942c2d0b470SArd Biesheuvel efi_retrieve_tpm2_eventlog(); 943c2d0b470SArd Biesheuvel 944c2d0b470SArd Biesheuvel setup_graphics(boot_params); 945c2d0b470SArd Biesheuvel 946c2d0b470SArd Biesheuvel setup_efi_pci(boot_params); 947c2d0b470SArd Biesheuvel 948a1b87d54SArd Biesheuvel setup_quirks(boot_params); 949c2d0b470SArd Biesheuvel 950c0461bd1SDionna Glaze setup_unaccepted_memory(); 951c0461bd1SDionna Glaze 952c2d0b470SArd Biesheuvel status = exit_boot(boot_params, handle); 953c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 95436bdd0a7SArvind Sankar efi_err("exit_boot() failed!\n"); 955c2d0b470SArd Biesheuvel goto fail; 956c2d0b470SArd Biesheuvel } 957c2d0b470SArd Biesheuvel 958a1b87d54SArd Biesheuvel /* 959a1b87d54SArd Biesheuvel * Call the SEV init code while still running with the firmware's 960a1b87d54SArd Biesheuvel * GDT/IDT, so #VC exceptions will be handled by EFI. 961a1b87d54SArd Biesheuvel */ 962a1b87d54SArd Biesheuvel sev_enable(boot_params); 963a1b87d54SArd Biesheuvel 964cb1c9e02SArd Biesheuvel efi_5level_switch(); 965cb1c9e02SArd Biesheuvel 966a1b87d54SArd Biesheuvel enter_kernel(kernel_entry, boot_params); 967c2d0b470SArd Biesheuvel fail: 968df9215f1SArd Biesheuvel efi_err("efi_stub_entry() failed!\n"); 969c2d0b470SArd Biesheuvel 9703b8f44fcSArd Biesheuvel efi_exit(handle, status); 971c2d0b470SArd Biesheuvel } 972df9215f1SArd Biesheuvel 973df9215f1SArd Biesheuvel #ifdef CONFIG_EFI_HANDOVER_PROTOCOL 974d7156b98SArd Biesheuvel void efi_handover_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg, 975d7156b98SArd Biesheuvel struct boot_params *boot_params) 976d7156b98SArd Biesheuvel { 977d7156b98SArd Biesheuvel memset(_bss, 0, _ebss - _bss); 978d7156b98SArd Biesheuvel efi_stub_entry(handle, sys_table_arg, boot_params); 979d7156b98SArd Biesheuvel } 980d7156b98SArd Biesheuvel 981df9215f1SArd Biesheuvel #ifndef CONFIG_EFI_MIXED 982d7156b98SArd Biesheuvel extern __alias(efi_handover_entry) 983df9215f1SArd Biesheuvel void efi32_stub_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg, 984df9215f1SArd Biesheuvel struct boot_params *boot_params); 985df9215f1SArd Biesheuvel 986d7156b98SArd Biesheuvel extern __alias(efi_handover_entry) 987df9215f1SArd Biesheuvel void efi64_stub_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg, 988df9215f1SArd Biesheuvel struct boot_params *boot_params); 989df9215f1SArd Biesheuvel #endif 990df9215f1SArd Biesheuvel #endif 991