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 24ccc27ae7SArd Biesheuvel const efi_system_table_t *efi_system_table; 253ba75c13SBaskov Evgeniy const efi_dxe_services_table_t *efi_dxe_table; 26987053a3SArvind Sankar static efi_loaded_image_t *image = NULL; 2711078876SArd Biesheuvel static efi_memory_attribute_protocol_t *memattr; 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; 758b94da92SMikel Rychliski rom->pcilen = 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 226cb1c9e02SArd Biesheuvel void efi_adjust_memory_range_protection(unsigned long start, 227cb1c9e02SArd Biesheuvel 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 rounded_start = rounddown(start, EFI_PAGE_SIZE); 23682e0d6d7SBaskov Evgeniy rounded_end = roundup(start + size, EFI_PAGE_SIZE); 23782e0d6d7SBaskov Evgeniy 23811078876SArd Biesheuvel if (memattr != NULL) { 23911078876SArd Biesheuvel efi_call_proto(memattr, clear_memory_attributes, rounded_start, 24011078876SArd Biesheuvel rounded_end - rounded_start, EFI_MEMORY_XP); 24111078876SArd Biesheuvel return; 24211078876SArd Biesheuvel } 24311078876SArd Biesheuvel 24411078876SArd Biesheuvel if (efi_dxe_table == NULL) 24511078876SArd Biesheuvel return; 24611078876SArd Biesheuvel 24782e0d6d7SBaskov Evgeniy /* 24882e0d6d7SBaskov Evgeniy * Don't modify memory region attributes, they are 24982e0d6d7SBaskov Evgeniy * already suitable, to lower the possibility to 25082e0d6d7SBaskov Evgeniy * encounter firmware bugs. 25182e0d6d7SBaskov Evgeniy */ 25282e0d6d7SBaskov Evgeniy 25382e0d6d7SBaskov Evgeniy for (end = start + size; start < end; start = next) { 25482e0d6d7SBaskov Evgeniy 25582e0d6d7SBaskov Evgeniy status = efi_dxe_call(get_memory_space_descriptor, start, &desc); 25682e0d6d7SBaskov Evgeniy 25782e0d6d7SBaskov Evgeniy if (status != EFI_SUCCESS) 25882e0d6d7SBaskov Evgeniy return; 25982e0d6d7SBaskov Evgeniy 26082e0d6d7SBaskov Evgeniy next = desc.base_address + desc.length; 26182e0d6d7SBaskov Evgeniy 26282e0d6d7SBaskov Evgeniy /* 26382e0d6d7SBaskov Evgeniy * Only system memory is suitable for trampoline/kernel image placement, 26482e0d6d7SBaskov Evgeniy * so only this type of memory needs its attributes to be modified. 26582e0d6d7SBaskov Evgeniy */ 26682e0d6d7SBaskov Evgeniy 26782e0d6d7SBaskov Evgeniy if (desc.gcd_memory_type != EfiGcdMemoryTypeSystemMemory || 26882e0d6d7SBaskov Evgeniy (desc.attributes & (EFI_MEMORY_RO | EFI_MEMORY_XP)) == 0) 26982e0d6d7SBaskov Evgeniy continue; 27082e0d6d7SBaskov Evgeniy 27182e0d6d7SBaskov Evgeniy unprotect_start = max(rounded_start, (unsigned long)desc.base_address); 27282e0d6d7SBaskov Evgeniy unprotect_size = min(rounded_end, next) - unprotect_start; 27382e0d6d7SBaskov Evgeniy 27482e0d6d7SBaskov Evgeniy status = efi_dxe_call(set_memory_space_attributes, 27582e0d6d7SBaskov Evgeniy unprotect_start, unprotect_size, 27682e0d6d7SBaskov Evgeniy EFI_MEMORY_WB); 27782e0d6d7SBaskov Evgeniy 27882e0d6d7SBaskov Evgeniy if (status != EFI_SUCCESS) { 27931f1a0edSArd Biesheuvel efi_warn("Unable to unprotect memory range [%08lx,%08lx]: %lx\n", 28082e0d6d7SBaskov Evgeniy unprotect_start, 28182e0d6d7SBaskov Evgeniy unprotect_start + unprotect_size, 28231f1a0edSArd Biesheuvel status); 28382e0d6d7SBaskov Evgeniy } 28482e0d6d7SBaskov Evgeniy } 28582e0d6d7SBaskov Evgeniy } 28682e0d6d7SBaskov Evgeniy 287c0461bd1SDionna Glaze static void setup_unaccepted_memory(void) 288c0461bd1SDionna Glaze { 289c0461bd1SDionna Glaze efi_guid_t mem_acceptance_proto = OVMF_SEV_MEMORY_ACCEPTANCE_PROTOCOL_GUID; 290c0461bd1SDionna Glaze sev_memory_acceptance_protocol_t *proto; 291c0461bd1SDionna Glaze efi_status_t status; 292c0461bd1SDionna Glaze 293c0461bd1SDionna Glaze if (!IS_ENABLED(CONFIG_UNACCEPTED_MEMORY)) 294c0461bd1SDionna Glaze return; 295c0461bd1SDionna Glaze 296c0461bd1SDionna Glaze /* 297c0461bd1SDionna Glaze * Enable unaccepted memory before calling exit boot services in order 298c0461bd1SDionna Glaze * for the UEFI to not accept all memory on EBS. 299c0461bd1SDionna Glaze */ 300c0461bd1SDionna Glaze status = efi_bs_call(locate_protocol, &mem_acceptance_proto, NULL, 301c0461bd1SDionna Glaze (void **)&proto); 302c0461bd1SDionna Glaze if (status != EFI_SUCCESS) 303c0461bd1SDionna Glaze return; 304c0461bd1SDionna Glaze 305c0461bd1SDionna Glaze status = efi_call_proto(proto, allow_unaccepted_memory); 306c0461bd1SDionna Glaze if (status != EFI_SUCCESS) 307c0461bd1SDionna Glaze efi_err("Memory acceptance protocol failed\n"); 308c0461bd1SDionna Glaze } 309c0461bd1SDionna Glaze 310c2d0b470SArd Biesheuvel static const efi_char16_t apple[] = L"Apple"; 311c2d0b470SArd Biesheuvel 312a1b87d54SArd Biesheuvel static void setup_quirks(struct boot_params *boot_params) 313c2d0b470SArd Biesheuvel { 314c2d0b470SArd Biesheuvel efi_char16_t *fw_vendor = (efi_char16_t *)(unsigned long) 315ccc27ae7SArd Biesheuvel efi_table_attr(efi_system_table, fw_vendor); 316c2d0b470SArd Biesheuvel 317c2d0b470SArd Biesheuvel if (!memcmp(fw_vendor, apple, sizeof(apple))) { 318c2d0b470SArd Biesheuvel if (IS_ENABLED(CONFIG_APPLE_PROPERTIES)) 319c2d0b470SArd Biesheuvel retrieve_apple_device_properties(boot_params); 320c2d0b470SArd Biesheuvel } 321c2d0b470SArd Biesheuvel } 322c2d0b470SArd Biesheuvel 323c2d0b470SArd Biesheuvel /* 324c2d0b470SArd Biesheuvel * See if we have Universal Graphics Adapter (UGA) protocol 325c2d0b470SArd Biesheuvel */ 326c2d0b470SArd Biesheuvel static efi_status_t 327c2d0b470SArd Biesheuvel setup_uga(struct screen_info *si, efi_guid_t *uga_proto, unsigned long size) 328c2d0b470SArd Biesheuvel { 329c2d0b470SArd Biesheuvel efi_status_t status; 330c2d0b470SArd Biesheuvel u32 width, height; 331c2d0b470SArd Biesheuvel void **uga_handle = NULL; 332c2d0b470SArd Biesheuvel efi_uga_draw_protocol_t *uga = NULL, *first_uga; 333c2d0b470SArd Biesheuvel efi_handle_t handle; 334c2d0b470SArd Biesheuvel int i; 335c2d0b470SArd Biesheuvel 336c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 337c2d0b470SArd Biesheuvel (void **)&uga_handle); 338c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 339c2d0b470SArd Biesheuvel return status; 340c2d0b470SArd Biesheuvel 341c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 342c2d0b470SArd Biesheuvel uga_proto, NULL, &size, uga_handle); 343c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 344c2d0b470SArd Biesheuvel goto free_handle; 345c2d0b470SArd Biesheuvel 346c2d0b470SArd Biesheuvel height = 0; 347c2d0b470SArd Biesheuvel width = 0; 348c2d0b470SArd Biesheuvel 349c2d0b470SArd Biesheuvel first_uga = NULL; 350c2d0b470SArd Biesheuvel for_each_efi_handle(handle, uga_handle, size, i) { 351c2d0b470SArd Biesheuvel efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID; 352c2d0b470SArd Biesheuvel u32 w, h, depth, refresh; 353c2d0b470SArd Biesheuvel void *pciio; 354c2d0b470SArd Biesheuvel 355c2d0b470SArd Biesheuvel status = efi_bs_call(handle_protocol, handle, uga_proto, 356c2d0b470SArd Biesheuvel (void **)&uga); 357c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 358c2d0b470SArd Biesheuvel continue; 359c2d0b470SArd Biesheuvel 360c2d0b470SArd Biesheuvel pciio = NULL; 361c2d0b470SArd Biesheuvel efi_bs_call(handle_protocol, handle, &pciio_proto, &pciio); 362c2d0b470SArd Biesheuvel 363c2d0b470SArd Biesheuvel status = efi_call_proto(uga, get_mode, &w, &h, &depth, &refresh); 364c2d0b470SArd Biesheuvel if (status == EFI_SUCCESS && (!first_uga || pciio)) { 365c2d0b470SArd Biesheuvel width = w; 366c2d0b470SArd Biesheuvel height = h; 367c2d0b470SArd Biesheuvel 368c2d0b470SArd Biesheuvel /* 369c2d0b470SArd Biesheuvel * Once we've found a UGA supporting PCIIO, 370c2d0b470SArd Biesheuvel * don't bother looking any further. 371c2d0b470SArd Biesheuvel */ 372c2d0b470SArd Biesheuvel if (pciio) 373c2d0b470SArd Biesheuvel break; 374c2d0b470SArd Biesheuvel 375c2d0b470SArd Biesheuvel first_uga = uga; 376c2d0b470SArd Biesheuvel } 377c2d0b470SArd Biesheuvel } 378c2d0b470SArd Biesheuvel 379c2d0b470SArd Biesheuvel if (!width && !height) 380c2d0b470SArd Biesheuvel goto free_handle; 381c2d0b470SArd Biesheuvel 382c2d0b470SArd Biesheuvel /* EFI framebuffer */ 383c2d0b470SArd Biesheuvel si->orig_video_isVGA = VIDEO_TYPE_EFI; 384c2d0b470SArd Biesheuvel 385c2d0b470SArd Biesheuvel si->lfb_depth = 32; 386c2d0b470SArd Biesheuvel si->lfb_width = width; 387c2d0b470SArd Biesheuvel si->lfb_height = height; 388c2d0b470SArd Biesheuvel 389c2d0b470SArd Biesheuvel si->red_size = 8; 390c2d0b470SArd Biesheuvel si->red_pos = 16; 391c2d0b470SArd Biesheuvel si->green_size = 8; 392c2d0b470SArd Biesheuvel si->green_pos = 8; 393c2d0b470SArd Biesheuvel si->blue_size = 8; 394c2d0b470SArd Biesheuvel si->blue_pos = 0; 395c2d0b470SArd Biesheuvel si->rsvd_size = 8; 396c2d0b470SArd Biesheuvel si->rsvd_pos = 24; 397c2d0b470SArd Biesheuvel 398c2d0b470SArd Biesheuvel free_handle: 399c2d0b470SArd Biesheuvel efi_bs_call(free_pool, uga_handle); 400c2d0b470SArd Biesheuvel 401c2d0b470SArd Biesheuvel return status; 402c2d0b470SArd Biesheuvel } 403c2d0b470SArd Biesheuvel 404c2d0b470SArd Biesheuvel static void setup_graphics(struct boot_params *boot_params) 405c2d0b470SArd Biesheuvel { 406c2d0b470SArd Biesheuvel efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID; 407c2d0b470SArd Biesheuvel struct screen_info *si; 408c2d0b470SArd Biesheuvel efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID; 409c2d0b470SArd Biesheuvel efi_status_t status; 410c2d0b470SArd Biesheuvel unsigned long size; 411c2d0b470SArd Biesheuvel void **gop_handle = NULL; 412c2d0b470SArd Biesheuvel void **uga_handle = NULL; 413c2d0b470SArd Biesheuvel 414c2d0b470SArd Biesheuvel si = &boot_params->screen_info; 415c2d0b470SArd Biesheuvel memset(si, 0, sizeof(*si)); 416c2d0b470SArd Biesheuvel 417c2d0b470SArd Biesheuvel size = 0; 418c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 419c2d0b470SArd Biesheuvel &graphics_proto, NULL, &size, gop_handle); 420c2d0b470SArd Biesheuvel if (status == EFI_BUFFER_TOO_SMALL) 421c2d0b470SArd Biesheuvel status = efi_setup_gop(si, &graphics_proto, size); 422c2d0b470SArd Biesheuvel 423c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 424c2d0b470SArd Biesheuvel size = 0; 425c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 426c2d0b470SArd Biesheuvel &uga_proto, NULL, &size, uga_handle); 427c2d0b470SArd Biesheuvel if (status == EFI_BUFFER_TOO_SMALL) 428c2d0b470SArd Biesheuvel setup_uga(si, &uga_proto, size); 429c2d0b470SArd Biesheuvel } 430c2d0b470SArd Biesheuvel } 431c2d0b470SArd Biesheuvel 4323b8f44fcSArd Biesheuvel 4333b8f44fcSArd Biesheuvel static void __noreturn efi_exit(efi_handle_t handle, efi_status_t status) 4343b8f44fcSArd Biesheuvel { 4353b8f44fcSArd Biesheuvel efi_bs_call(exit, handle, status, 0, NULL); 436f3fa0efcSArd Biesheuvel for(;;) 437f3fa0efcSArd Biesheuvel asm("hlt"); 4383b8f44fcSArd Biesheuvel } 4393b8f44fcSArd Biesheuvel 440c2d0b470SArd Biesheuvel void __noreturn efi_stub_entry(efi_handle_t handle, 441c2d0b470SArd Biesheuvel efi_system_table_t *sys_table_arg, 442c2d0b470SArd Biesheuvel struct boot_params *boot_params); 443c2d0b470SArd Biesheuvel 444c2d0b470SArd Biesheuvel /* 445c2d0b470SArd Biesheuvel * Because the x86 boot code expects to be passed a boot_params we 446c2d0b470SArd Biesheuvel * need to create one ourselves (usually the bootloader would create 447c2d0b470SArd Biesheuvel * one for us). 448c2d0b470SArd Biesheuvel */ 449c2d0b470SArd Biesheuvel efi_status_t __efiapi efi_pe_entry(efi_handle_t handle, 450c2d0b470SArd Biesheuvel efi_system_table_t *sys_table_arg) 451c2d0b470SArd Biesheuvel { 452c2d0b470SArd Biesheuvel struct boot_params *boot_params; 453c2d0b470SArd Biesheuvel struct setup_header *hdr; 4541887c9b6SArvind Sankar void *image_base; 455c2d0b470SArd Biesheuvel efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID; 456c2d0b470SArd Biesheuvel int options_size = 0; 457c2d0b470SArd Biesheuvel efi_status_t status; 458c2d0b470SArd Biesheuvel char *cmdline_ptr; 459c2d0b470SArd Biesheuvel 460ccc27ae7SArd Biesheuvel efi_system_table = sys_table_arg; 461c2d0b470SArd Biesheuvel 462c2d0b470SArd Biesheuvel /* Check if we were booted by the EFI firmware */ 463ccc27ae7SArd Biesheuvel if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) 4643b8f44fcSArd Biesheuvel efi_exit(handle, EFI_INVALID_PARAMETER); 465c2d0b470SArd Biesheuvel 4660347d8c2SArvind Sankar status = efi_bs_call(handle_protocol, handle, &proto, (void **)&image); 467c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 46836bdd0a7SArvind Sankar efi_err("Failed to get handle for LOADED_IMAGE_PROTOCOL\n"); 4693b8f44fcSArd Biesheuvel efi_exit(handle, status); 470c2d0b470SArd Biesheuvel } 471c2d0b470SArd Biesheuvel 4721887c9b6SArvind Sankar image_base = efi_table_attr(image, image_base); 4731887c9b6SArvind Sankar 474019512f1SArvind Sankar status = efi_allocate_pages(sizeof(struct boot_params), 475019512f1SArvind Sankar (unsigned long *)&boot_params, ULONG_MAX); 476c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 47736bdd0a7SArvind Sankar efi_err("Failed to allocate lowmem for boot params\n"); 4783b8f44fcSArd Biesheuvel efi_exit(handle, status); 479c2d0b470SArd Biesheuvel } 480c2d0b470SArd Biesheuvel 481019512f1SArvind Sankar memset(boot_params, 0x0, sizeof(struct boot_params)); 482c2d0b470SArd Biesheuvel 483c2d0b470SArd Biesheuvel hdr = &boot_params->hdr; 484c2d0b470SArd Biesheuvel 48559476f80SArvind Sankar /* Copy the setup header from the second sector to boot_params */ 48659476f80SArvind Sankar memcpy(&hdr->jump, image_base + 512, 48759476f80SArvind Sankar sizeof(struct setup_header) - offsetof(struct setup_header, jump)); 488c2d0b470SArd Biesheuvel 489c2d0b470SArd Biesheuvel /* 490c2d0b470SArd Biesheuvel * Fill out some of the header fields ourselves because the 491c2d0b470SArd Biesheuvel * EFI firmware loader doesn't load the first sector. 492c2d0b470SArd Biesheuvel */ 493c2d0b470SArd Biesheuvel hdr->root_flags = 1; 494c2d0b470SArd Biesheuvel hdr->vid_mode = 0xffff; 495c2d0b470SArd Biesheuvel hdr->boot_flag = 0xAA55; 496c2d0b470SArd Biesheuvel 497c2d0b470SArd Biesheuvel hdr->type_of_loader = 0x21; 498c2d0b470SArd Biesheuvel 499c2d0b470SArd Biesheuvel /* Convert unicode cmdline to ascii */ 50027cd5511SArd Biesheuvel cmdline_ptr = efi_convert_cmdline(image, &options_size); 501c2d0b470SArd Biesheuvel if (!cmdline_ptr) 502c2d0b470SArd Biesheuvel goto fail; 503c2d0b470SArd Biesheuvel 504eed4e019SArvind Sankar efi_set_u64_split((unsigned long)cmdline_ptr, 505eed4e019SArvind Sankar &hdr->cmd_line_ptr, &boot_params->ext_cmd_line_ptr); 506c2d0b470SArd Biesheuvel 507c2d0b470SArd Biesheuvel hdr->ramdisk_image = 0; 508c2d0b470SArd Biesheuvel hdr->ramdisk_size = 0; 509c2d0b470SArd Biesheuvel 51063bf28ceSArd Biesheuvel /* 51163bf28ceSArd Biesheuvel * Disregard any setup data that was provided by the bootloader: 51263bf28ceSArd Biesheuvel * setup_data could be pointing anywhere, and we have no way of 51363bf28ceSArd Biesheuvel * authenticating or validating the payload. 51463bf28ceSArd Biesheuvel */ 51563bf28ceSArd Biesheuvel hdr->setup_data = 0; 51663bf28ceSArd Biesheuvel 517ccc27ae7SArd Biesheuvel efi_stub_entry(handle, sys_table_arg, boot_params); 518c2d0b470SArd Biesheuvel /* not reached */ 519c2d0b470SArd Biesheuvel 520c2d0b470SArd Biesheuvel fail: 521019512f1SArvind Sankar efi_free(sizeof(struct boot_params), (unsigned long)boot_params); 522c2d0b470SArd Biesheuvel 5233b8f44fcSArd Biesheuvel efi_exit(handle, status); 524c2d0b470SArd Biesheuvel } 525c2d0b470SArd Biesheuvel 526c2d0b470SArd Biesheuvel static void add_e820ext(struct boot_params *params, 527c2d0b470SArd Biesheuvel struct setup_data *e820ext, u32 nr_entries) 528c2d0b470SArd Biesheuvel { 529c2d0b470SArd Biesheuvel struct setup_data *data; 530c2d0b470SArd Biesheuvel 531c2d0b470SArd Biesheuvel e820ext->type = SETUP_E820_EXT; 532c2d0b470SArd Biesheuvel e820ext->len = nr_entries * sizeof(struct boot_e820_entry); 533c2d0b470SArd Biesheuvel e820ext->next = 0; 534c2d0b470SArd Biesheuvel 535c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)params->hdr.setup_data; 536c2d0b470SArd Biesheuvel 537c2d0b470SArd Biesheuvel while (data && data->next) 538c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)data->next; 539c2d0b470SArd Biesheuvel 540c2d0b470SArd Biesheuvel if (data) 541c2d0b470SArd Biesheuvel data->next = (unsigned long)e820ext; 542c2d0b470SArd Biesheuvel else 543c2d0b470SArd Biesheuvel params->hdr.setup_data = (unsigned long)e820ext; 544c2d0b470SArd Biesheuvel } 545c2d0b470SArd Biesheuvel 546c2d0b470SArd Biesheuvel static efi_status_t 547c2d0b470SArd Biesheuvel setup_e820(struct boot_params *params, struct setup_data *e820ext, u32 e820ext_size) 548c2d0b470SArd Biesheuvel { 549c2d0b470SArd Biesheuvel struct boot_e820_entry *entry = params->e820_table; 550c2d0b470SArd Biesheuvel struct efi_info *efi = ¶ms->efi_info; 551c2d0b470SArd Biesheuvel struct boot_e820_entry *prev = NULL; 552c2d0b470SArd Biesheuvel u32 nr_entries; 553c2d0b470SArd Biesheuvel u32 nr_desc; 554c2d0b470SArd Biesheuvel int i; 555c2d0b470SArd Biesheuvel 556c2d0b470SArd Biesheuvel nr_entries = 0; 557c2d0b470SArd Biesheuvel nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size; 558c2d0b470SArd Biesheuvel 559c2d0b470SArd Biesheuvel for (i = 0; i < nr_desc; i++) { 560c2d0b470SArd Biesheuvel efi_memory_desc_t *d; 561c2d0b470SArd Biesheuvel unsigned int e820_type = 0; 562c2d0b470SArd Biesheuvel unsigned long m = efi->efi_memmap; 563c2d0b470SArd Biesheuvel 564c2d0b470SArd Biesheuvel #ifdef CONFIG_X86_64 565c2d0b470SArd Biesheuvel m |= (u64)efi->efi_memmap_hi << 32; 566c2d0b470SArd Biesheuvel #endif 567c2d0b470SArd Biesheuvel 568c2d0b470SArd Biesheuvel d = efi_early_memdesc_ptr(m, efi->efi_memdesc_size, i); 569c2d0b470SArd Biesheuvel switch (d->type) { 570c2d0b470SArd Biesheuvel case EFI_RESERVED_TYPE: 571c2d0b470SArd Biesheuvel case EFI_RUNTIME_SERVICES_CODE: 572c2d0b470SArd Biesheuvel case EFI_RUNTIME_SERVICES_DATA: 573c2d0b470SArd Biesheuvel case EFI_MEMORY_MAPPED_IO: 574c2d0b470SArd Biesheuvel case EFI_MEMORY_MAPPED_IO_PORT_SPACE: 575c2d0b470SArd Biesheuvel case EFI_PAL_CODE: 576c2d0b470SArd Biesheuvel e820_type = E820_TYPE_RESERVED; 577c2d0b470SArd Biesheuvel break; 578c2d0b470SArd Biesheuvel 579c2d0b470SArd Biesheuvel case EFI_UNUSABLE_MEMORY: 580c2d0b470SArd Biesheuvel e820_type = E820_TYPE_UNUSABLE; 581c2d0b470SArd Biesheuvel break; 582c2d0b470SArd Biesheuvel 583c2d0b470SArd Biesheuvel case EFI_ACPI_RECLAIM_MEMORY: 584c2d0b470SArd Biesheuvel e820_type = E820_TYPE_ACPI; 585c2d0b470SArd Biesheuvel break; 586c2d0b470SArd Biesheuvel 587c2d0b470SArd Biesheuvel case EFI_LOADER_CODE: 588c2d0b470SArd Biesheuvel case EFI_LOADER_DATA: 589c2d0b470SArd Biesheuvel case EFI_BOOT_SERVICES_CODE: 590c2d0b470SArd Biesheuvel case EFI_BOOT_SERVICES_DATA: 591c2d0b470SArd Biesheuvel case EFI_CONVENTIONAL_MEMORY: 592c2d0b470SArd Biesheuvel if (efi_soft_reserve_enabled() && 593c2d0b470SArd Biesheuvel (d->attribute & EFI_MEMORY_SP)) 594c2d0b470SArd Biesheuvel e820_type = E820_TYPE_SOFT_RESERVED; 595c2d0b470SArd Biesheuvel else 596c2d0b470SArd Biesheuvel e820_type = E820_TYPE_RAM; 597c2d0b470SArd Biesheuvel break; 598c2d0b470SArd Biesheuvel 599c2d0b470SArd Biesheuvel case EFI_ACPI_MEMORY_NVS: 600c2d0b470SArd Biesheuvel e820_type = E820_TYPE_NVS; 601c2d0b470SArd Biesheuvel break; 602c2d0b470SArd Biesheuvel 603c2d0b470SArd Biesheuvel case EFI_PERSISTENT_MEMORY: 604c2d0b470SArd Biesheuvel e820_type = E820_TYPE_PMEM; 605c2d0b470SArd Biesheuvel break; 606c2d0b470SArd Biesheuvel 607745e3ed8SKirill A. Shutemov case EFI_UNACCEPTED_MEMORY: 608*ff07186bSNikolay Borisov if (!IS_ENABLED(CONFIG_UNACCEPTED_MEMORY)) 609745e3ed8SKirill A. Shutemov continue; 610745e3ed8SKirill A. Shutemov e820_type = E820_TYPE_RAM; 611745e3ed8SKirill A. Shutemov process_unaccepted_memory(d->phys_addr, 612745e3ed8SKirill A. Shutemov d->phys_addr + PAGE_SIZE * d->num_pages); 613745e3ed8SKirill A. Shutemov break; 614c2d0b470SArd Biesheuvel default: 615c2d0b470SArd Biesheuvel continue; 616c2d0b470SArd Biesheuvel } 617c2d0b470SArd Biesheuvel 618c2d0b470SArd Biesheuvel /* Merge adjacent mappings */ 619c2d0b470SArd Biesheuvel if (prev && prev->type == e820_type && 620c2d0b470SArd Biesheuvel (prev->addr + prev->size) == d->phys_addr) { 621c2d0b470SArd Biesheuvel prev->size += d->num_pages << 12; 622c2d0b470SArd Biesheuvel continue; 623c2d0b470SArd Biesheuvel } 624c2d0b470SArd Biesheuvel 625c2d0b470SArd Biesheuvel if (nr_entries == ARRAY_SIZE(params->e820_table)) { 626c2d0b470SArd Biesheuvel u32 need = (nr_desc - i) * sizeof(struct e820_entry) + 627c2d0b470SArd Biesheuvel sizeof(struct setup_data); 628c2d0b470SArd Biesheuvel 629c2d0b470SArd Biesheuvel if (!e820ext || e820ext_size < need) 630c2d0b470SArd Biesheuvel return EFI_BUFFER_TOO_SMALL; 631c2d0b470SArd Biesheuvel 632c2d0b470SArd Biesheuvel /* boot_params map full, switch to e820 extended */ 633c2d0b470SArd Biesheuvel entry = (struct boot_e820_entry *)e820ext->data; 634c2d0b470SArd Biesheuvel } 635c2d0b470SArd Biesheuvel 636c2d0b470SArd Biesheuvel entry->addr = d->phys_addr; 637c2d0b470SArd Biesheuvel entry->size = d->num_pages << PAGE_SHIFT; 638c2d0b470SArd Biesheuvel entry->type = e820_type; 639c2d0b470SArd Biesheuvel prev = entry++; 640c2d0b470SArd Biesheuvel nr_entries++; 641c2d0b470SArd Biesheuvel } 642c2d0b470SArd Biesheuvel 643c2d0b470SArd Biesheuvel if (nr_entries > ARRAY_SIZE(params->e820_table)) { 644c2d0b470SArd Biesheuvel u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_table); 645c2d0b470SArd Biesheuvel 646c2d0b470SArd Biesheuvel add_e820ext(params, e820ext, nr_e820ext); 647c2d0b470SArd Biesheuvel nr_entries -= nr_e820ext; 648c2d0b470SArd Biesheuvel } 649c2d0b470SArd Biesheuvel 650c2d0b470SArd Biesheuvel params->e820_entries = (u8)nr_entries; 651c2d0b470SArd Biesheuvel 652c2d0b470SArd Biesheuvel return EFI_SUCCESS; 653c2d0b470SArd Biesheuvel } 654c2d0b470SArd Biesheuvel 655c2d0b470SArd Biesheuvel static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext, 656c2d0b470SArd Biesheuvel u32 *e820ext_size) 657c2d0b470SArd Biesheuvel { 658c2d0b470SArd Biesheuvel efi_status_t status; 659c2d0b470SArd Biesheuvel unsigned long size; 660c2d0b470SArd Biesheuvel 661c2d0b470SArd Biesheuvel size = sizeof(struct setup_data) + 662c2d0b470SArd Biesheuvel sizeof(struct e820_entry) * nr_desc; 663c2d0b470SArd Biesheuvel 664c2d0b470SArd Biesheuvel if (*e820ext) { 665c2d0b470SArd Biesheuvel efi_bs_call(free_pool, *e820ext); 666c2d0b470SArd Biesheuvel *e820ext = NULL; 667c2d0b470SArd Biesheuvel *e820ext_size = 0; 668c2d0b470SArd Biesheuvel } 669c2d0b470SArd Biesheuvel 670c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 671c2d0b470SArd Biesheuvel (void **)e820ext); 672c2d0b470SArd Biesheuvel if (status == EFI_SUCCESS) 673c2d0b470SArd Biesheuvel *e820ext_size = size; 674c2d0b470SArd Biesheuvel 675c2d0b470SArd Biesheuvel return status; 676c2d0b470SArd Biesheuvel } 677c2d0b470SArd Biesheuvel 678c2d0b470SArd Biesheuvel static efi_status_t allocate_e820(struct boot_params *params, 679c2d0b470SArd Biesheuvel struct setup_data **e820ext, 680c2d0b470SArd Biesheuvel u32 *e820ext_size) 681c2d0b470SArd Biesheuvel { 6822e9f46eeSKirill A. Shutemov struct efi_boot_memmap *map; 683c2d0b470SArd Biesheuvel efi_status_t status; 6842e9f46eeSKirill A. Shutemov __u32 nr_desc; 685c2d0b470SArd Biesheuvel 6862e9f46eeSKirill A. Shutemov status = efi_get_memory_map(&map, false); 687c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 688c2d0b470SArd Biesheuvel return status; 6892e9f46eeSKirill A. Shutemov 6902e9f46eeSKirill A. Shutemov nr_desc = map->map_size / map->desc_size; 6912e9f46eeSKirill A. Shutemov if (nr_desc > ARRAY_SIZE(params->e820_table) - EFI_MMAP_NR_SLACK_SLOTS) { 6922e9f46eeSKirill A. Shutemov u32 nr_e820ext = nr_desc - ARRAY_SIZE(params->e820_table) + 6932e9f46eeSKirill A. Shutemov EFI_MMAP_NR_SLACK_SLOTS; 6942e9f46eeSKirill A. Shutemov 6952e9f46eeSKirill A. Shutemov status = alloc_e820ext(nr_e820ext, e820ext, e820ext_size); 696c2d0b470SArd Biesheuvel } 697c2d0b470SArd Biesheuvel 698745e3ed8SKirill A. Shutemov if (IS_ENABLED(CONFIG_UNACCEPTED_MEMORY) && status == EFI_SUCCESS) 699745e3ed8SKirill A. Shutemov status = allocate_unaccepted_bitmap(nr_desc, map); 700745e3ed8SKirill A. Shutemov 7012e9f46eeSKirill A. Shutemov efi_bs_call(free_pool, map); 7022e9f46eeSKirill A. Shutemov return status; 703c2d0b470SArd Biesheuvel } 704c2d0b470SArd Biesheuvel 705c2d0b470SArd Biesheuvel struct exit_boot_struct { 706c2d0b470SArd Biesheuvel struct boot_params *boot_params; 707c2d0b470SArd Biesheuvel struct efi_info *efi; 708c2d0b470SArd Biesheuvel }; 709c2d0b470SArd Biesheuvel 710c2d0b470SArd Biesheuvel static efi_status_t exit_boot_func(struct efi_boot_memmap *map, 711c2d0b470SArd Biesheuvel void *priv) 712c2d0b470SArd Biesheuvel { 713c2d0b470SArd Biesheuvel const char *signature; 714c2d0b470SArd Biesheuvel struct exit_boot_struct *p = priv; 715c2d0b470SArd Biesheuvel 716c2d0b470SArd Biesheuvel signature = efi_is_64bit() ? EFI64_LOADER_SIGNATURE 717c2d0b470SArd Biesheuvel : EFI32_LOADER_SIGNATURE; 718c2d0b470SArd Biesheuvel memcpy(&p->efi->efi_loader_signature, signature, sizeof(__u32)); 719c2d0b470SArd Biesheuvel 720eed4e019SArvind Sankar efi_set_u64_split((unsigned long)efi_system_table, 721eed4e019SArvind Sankar &p->efi->efi_systab, &p->efi->efi_systab_hi); 722eab31265SArd Biesheuvel p->efi->efi_memdesc_size = map->desc_size; 723eab31265SArd Biesheuvel p->efi->efi_memdesc_version = map->desc_ver; 724eab31265SArd Biesheuvel efi_set_u64_split((unsigned long)map->map, 725eed4e019SArvind Sankar &p->efi->efi_memmap, &p->efi->efi_memmap_hi); 726eab31265SArd Biesheuvel p->efi->efi_memmap_size = map->map_size; 727c2d0b470SArd Biesheuvel 728c2d0b470SArd Biesheuvel return EFI_SUCCESS; 729c2d0b470SArd Biesheuvel } 730c2d0b470SArd Biesheuvel 731c2d0b470SArd Biesheuvel static efi_status_t exit_boot(struct boot_params *boot_params, void *handle) 732c2d0b470SArd Biesheuvel { 733c2d0b470SArd Biesheuvel struct setup_data *e820ext = NULL; 734c2d0b470SArd Biesheuvel __u32 e820ext_size = 0; 735c2d0b470SArd Biesheuvel efi_status_t status; 736c2d0b470SArd Biesheuvel struct exit_boot_struct priv; 737c2d0b470SArd Biesheuvel 738c2d0b470SArd Biesheuvel priv.boot_params = boot_params; 739c2d0b470SArd Biesheuvel priv.efi = &boot_params->efi_info; 740c2d0b470SArd Biesheuvel 741c2d0b470SArd Biesheuvel status = allocate_e820(boot_params, &e820ext, &e820ext_size); 742c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 743c2d0b470SArd Biesheuvel return status; 744c2d0b470SArd Biesheuvel 745c2d0b470SArd Biesheuvel /* Might as well exit boot services now */ 746eab31265SArd Biesheuvel status = efi_exit_boot_services(handle, &priv, exit_boot_func); 747c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 748c2d0b470SArd Biesheuvel return status; 749c2d0b470SArd Biesheuvel 750c2d0b470SArd Biesheuvel /* Historic? */ 751c2d0b470SArd Biesheuvel boot_params->alt_mem_k = 32 * 1024; 752c2d0b470SArd Biesheuvel 753c2d0b470SArd Biesheuvel status = setup_e820(boot_params, e820ext, e820ext_size); 754c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 755c2d0b470SArd Biesheuvel return status; 756c2d0b470SArd Biesheuvel 757c2d0b470SArd Biesheuvel return EFI_SUCCESS; 758c2d0b470SArd Biesheuvel } 759c2d0b470SArd Biesheuvel 76031c77a50SArd Biesheuvel static bool have_unsupported_snp_features(void) 76131c77a50SArd Biesheuvel { 76231c77a50SArd Biesheuvel u64 unsupported; 76331c77a50SArd Biesheuvel 76431c77a50SArd Biesheuvel unsupported = snp_get_unsupported_features(sev_get_status()); 76531c77a50SArd Biesheuvel if (unsupported) { 76631c77a50SArd Biesheuvel efi_err("Unsupported SEV-SNP features detected: 0x%llx\n", 76731c77a50SArd Biesheuvel unsupported); 76831c77a50SArd Biesheuvel return true; 76931c77a50SArd Biesheuvel } 77031c77a50SArd Biesheuvel return false; 77131c77a50SArd Biesheuvel } 77231c77a50SArd Biesheuvel 773a1b87d54SArd Biesheuvel static void efi_get_seed(void *seed, int size) 774a1b87d54SArd Biesheuvel { 775a1b87d54SArd Biesheuvel efi_get_random_bytes(size, seed); 776a1b87d54SArd Biesheuvel 777a1b87d54SArd Biesheuvel /* 778a1b87d54SArd Biesheuvel * This only updates seed[0] when running on 32-bit, but in that case, 779a1b87d54SArd Biesheuvel * seed[1] is not used anyway, as there is no virtual KASLR on 32-bit. 780a1b87d54SArd Biesheuvel */ 781a1b87d54SArd Biesheuvel *(unsigned long *)seed ^= kaslr_get_random_long("EFI"); 782a1b87d54SArd Biesheuvel } 783a1b87d54SArd Biesheuvel 784a1b87d54SArd Biesheuvel static void error(char *str) 785a1b87d54SArd Biesheuvel { 786a1b87d54SArd Biesheuvel efi_warn("Decompression failed: %s\n", str); 787a1b87d54SArd Biesheuvel } 788a1b87d54SArd Biesheuvel 789a1b87d54SArd Biesheuvel static efi_status_t efi_decompress_kernel(unsigned long *kernel_entry) 790a1b87d54SArd Biesheuvel { 791a1b87d54SArd Biesheuvel unsigned long virt_addr = LOAD_PHYSICAL_ADDR; 792a1b87d54SArd Biesheuvel unsigned long addr, alloc_size, entry; 793a1b87d54SArd Biesheuvel efi_status_t status; 794a1b87d54SArd Biesheuvel u32 seed[2] = {}; 795a1b87d54SArd Biesheuvel 796a1b87d54SArd Biesheuvel /* determine the required size of the allocation */ 797a1b87d54SArd Biesheuvel alloc_size = ALIGN(max_t(unsigned long, output_len, kernel_total_size), 798a1b87d54SArd Biesheuvel MIN_KERNEL_ALIGN); 799a1b87d54SArd Biesheuvel 800a1b87d54SArd Biesheuvel if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && !efi_nokaslr) { 801a1b87d54SArd Biesheuvel u64 range = KERNEL_IMAGE_SIZE - LOAD_PHYSICAL_ADDR - kernel_total_size; 802a1b87d54SArd Biesheuvel 803a1b87d54SArd Biesheuvel efi_get_seed(seed, sizeof(seed)); 804a1b87d54SArd Biesheuvel 805a1b87d54SArd Biesheuvel virt_addr += (range * seed[1]) >> 32; 806a1b87d54SArd Biesheuvel virt_addr &= ~(CONFIG_PHYSICAL_ALIGN - 1); 807a1b87d54SArd Biesheuvel } 808a1b87d54SArd Biesheuvel 809a1b87d54SArd Biesheuvel status = efi_random_alloc(alloc_size, CONFIG_PHYSICAL_ALIGN, &addr, 810a1b87d54SArd Biesheuvel seed[0], EFI_LOADER_CODE, 811a1b87d54SArd Biesheuvel EFI_X86_KERNEL_ALLOC_LIMIT); 812a1b87d54SArd Biesheuvel if (status != EFI_SUCCESS) 813a1b87d54SArd Biesheuvel return status; 814a1b87d54SArd Biesheuvel 815a1b87d54SArd Biesheuvel entry = decompress_kernel((void *)addr, virt_addr, error); 816a1b87d54SArd Biesheuvel if (entry == ULONG_MAX) { 817a1b87d54SArd Biesheuvel efi_free(alloc_size, addr); 818a1b87d54SArd Biesheuvel return EFI_LOAD_ERROR; 819a1b87d54SArd Biesheuvel } 820a1b87d54SArd Biesheuvel 821a1b87d54SArd Biesheuvel *kernel_entry = addr + entry; 822a1b87d54SArd Biesheuvel 823a1b87d54SArd Biesheuvel efi_adjust_memory_range_protection(addr, kernel_total_size); 824a1b87d54SArd Biesheuvel 825a1b87d54SArd Biesheuvel return EFI_SUCCESS; 826a1b87d54SArd Biesheuvel } 827a1b87d54SArd Biesheuvel 828d2d7a54fSArd Biesheuvel static void __noreturn enter_kernel(unsigned long kernel_addr, 829d2d7a54fSArd Biesheuvel struct boot_params *boot_params) 830d2d7a54fSArd Biesheuvel { 831d2d7a54fSArd Biesheuvel /* enter decompressed kernel with boot_params pointer in RSI/ESI */ 832d2d7a54fSArd Biesheuvel asm("jmp *%0"::"r"(kernel_addr), "S"(boot_params)); 833d2d7a54fSArd Biesheuvel 834d2d7a54fSArd Biesheuvel unreachable(); 835d2d7a54fSArd Biesheuvel } 836d2d7a54fSArd Biesheuvel 837c2d0b470SArd Biesheuvel /* 838d2d7a54fSArd Biesheuvel * On success, this routine will jump to the relocated image directly and never 839d2d7a54fSArd Biesheuvel * return. On failure, it will exit to the firmware via efi_exit() instead of 840d2d7a54fSArd Biesheuvel * returning. 841c2d0b470SArd Biesheuvel */ 842df9215f1SArd Biesheuvel void __noreturn efi_stub_entry(efi_handle_t handle, 843c2d0b470SArd Biesheuvel efi_system_table_t *sys_table_arg, 844c2d0b470SArd Biesheuvel struct boot_params *boot_params) 845c2d0b470SArd Biesheuvel { 84611078876SArd Biesheuvel efi_guid_t guid = EFI_MEMORY_ATTRIBUTE_PROTOCOL_GUID; 847c2d0b470SArd Biesheuvel struct setup_header *hdr = &boot_params->hdr; 848f4dc7fffSArd Biesheuvel const struct linux_efi_initrd *initrd = NULL; 849a1b87d54SArd Biesheuvel unsigned long kernel_entry; 850c2d0b470SArd Biesheuvel efi_status_t status; 851c2d0b470SArd Biesheuvel 852ccc27ae7SArd Biesheuvel efi_system_table = sys_table_arg; 853c2d0b470SArd Biesheuvel /* Check if we were booted by the EFI firmware */ 854ccc27ae7SArd Biesheuvel if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) 8553b8f44fcSArd Biesheuvel efi_exit(handle, EFI_INVALID_PARAMETER); 856c2d0b470SArd Biesheuvel 85731c77a50SArd Biesheuvel if (have_unsupported_snp_features()) 85831c77a50SArd Biesheuvel efi_exit(handle, EFI_UNSUPPORTED); 85931c77a50SArd Biesheuvel 86011078876SArd Biesheuvel if (IS_ENABLED(CONFIG_EFI_DXE_MEM_ATTRIBUTES)) { 8613ba75c13SBaskov Evgeniy efi_dxe_table = get_efi_config_table(EFI_DXE_SERVICES_TABLE_GUID); 8623ba75c13SBaskov Evgeniy if (efi_dxe_table && 8633ba75c13SBaskov Evgeniy efi_dxe_table->hdr.signature != EFI_DXE_SERVICES_TABLE_SIGNATURE) { 8643ba75c13SBaskov Evgeniy efi_warn("Ignoring DXE services table: invalid signature\n"); 8653ba75c13SBaskov Evgeniy efi_dxe_table = NULL; 8663ba75c13SBaskov Evgeniy } 86711078876SArd Biesheuvel } 86811078876SArd Biesheuvel 86911078876SArd Biesheuvel /* grab the memory attributes protocol if it exists */ 87011078876SArd Biesheuvel efi_bs_call(locate_protocol, &guid, NULL, (void **)&memattr); 8713ba75c13SBaskov Evgeniy 872cb1c9e02SArd Biesheuvel status = efi_setup_5level_paging(); 873cb1c9e02SArd Biesheuvel if (status != EFI_SUCCESS) { 874cb1c9e02SArd Biesheuvel efi_err("efi_setup_5level_paging() failed!\n"); 875cb1c9e02SArd Biesheuvel goto fail; 876cb1c9e02SArd Biesheuvel } 877cb1c9e02SArd Biesheuvel 8787dde67f2SArvind Sankar #ifdef CONFIG_CMDLINE_BOOL 879055042beSArvind Sankar status = efi_parse_options(CONFIG_CMDLINE); 880055042beSArvind Sankar if (status != EFI_SUCCESS) { 881055042beSArvind Sankar efi_err("Failed to parse options\n"); 882055042beSArvind Sankar goto fail; 883055042beSArvind Sankar } 8847dde67f2SArvind Sankar #endif 8857dde67f2SArvind Sankar if (!IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) { 8867dde67f2SArvind Sankar unsigned long cmdline_paddr = ((u64)hdr->cmd_line_ptr | 887c2d0b470SArd Biesheuvel ((u64)boot_params->ext_cmd_line_ptr << 32)); 888055042beSArvind Sankar status = efi_parse_options((char *)cmdline_paddr); 889055042beSArvind Sankar if (status != EFI_SUCCESS) { 890055042beSArvind Sankar efi_err("Failed to parse options\n"); 891055042beSArvind Sankar goto fail; 892055042beSArvind Sankar } 8937dde67f2SArvind Sankar } 894c2d0b470SArd Biesheuvel 895a1b87d54SArd Biesheuvel status = efi_decompress_kernel(&kernel_entry); 896a1b87d54SArd Biesheuvel if (status != EFI_SUCCESS) { 897a1b87d54SArd Biesheuvel efi_err("Failed to decompress kernel\n"); 898a1b87d54SArd Biesheuvel goto fail; 899a1b87d54SArd Biesheuvel } 900a1b87d54SArd Biesheuvel 901c2d0b470SArd Biesheuvel /* 902987053a3SArvind Sankar * At this point, an initrd may already have been loaded by the 903987053a3SArvind Sankar * bootloader and passed via bootparams. We permit an initrd loaded 904987053a3SArvind Sankar * from the LINUX_EFI_INITRD_MEDIA_GUID device path to supersede it. 905987053a3SArvind Sankar * 906987053a3SArvind Sankar * If the device path is not present, any command-line initrd= 907987053a3SArvind Sankar * arguments will be processed only if image is not NULL, which will be 908987053a3SArvind Sankar * the case only if we were loaded via the PE entry point. 909ec93fc37SArd Biesheuvel */ 910f4dc7fffSArd Biesheuvel status = efi_load_initrd(image, hdr->initrd_addr_max, ULONG_MAX, 911f4dc7fffSArd Biesheuvel &initrd); 91220287d56SArd Biesheuvel if (status != EFI_SUCCESS) 913ec93fc37SArd Biesheuvel goto fail; 914f4dc7fffSArd Biesheuvel if (initrd && initrd->size > 0) { 915f4dc7fffSArd Biesheuvel efi_set_u64_split(initrd->base, &hdr->ramdisk_image, 916eed4e019SArvind Sankar &boot_params->ext_ramdisk_image); 917f4dc7fffSArd Biesheuvel efi_set_u64_split(initrd->size, &hdr->ramdisk_size, 918eed4e019SArvind Sankar &boot_params->ext_ramdisk_size); 91979d3219dSArd Biesheuvel } 920ec93fc37SArd Biesheuvel 921f4dc7fffSArd Biesheuvel 922ec93fc37SArd Biesheuvel /* 923c2d0b470SArd Biesheuvel * If the boot loader gave us a value for secure_boot then we use that, 924c2d0b470SArd Biesheuvel * otherwise we ask the BIOS. 925c2d0b470SArd Biesheuvel */ 926c2d0b470SArd Biesheuvel if (boot_params->secure_boot == efi_secureboot_mode_unset) 927c2d0b470SArd Biesheuvel boot_params->secure_boot = efi_get_secureboot(); 928c2d0b470SArd Biesheuvel 929c2d0b470SArd Biesheuvel /* Ask the firmware to clear memory on unclean shutdown */ 930c2d0b470SArd Biesheuvel efi_enable_reset_attack_mitigation(); 931c2d0b470SArd Biesheuvel 932c2d0b470SArd Biesheuvel efi_random_get_seed(); 933c2d0b470SArd Biesheuvel 934c2d0b470SArd Biesheuvel efi_retrieve_tpm2_eventlog(); 935c2d0b470SArd Biesheuvel 936c2d0b470SArd Biesheuvel setup_graphics(boot_params); 937c2d0b470SArd Biesheuvel 938c2d0b470SArd Biesheuvel setup_efi_pci(boot_params); 939c2d0b470SArd Biesheuvel 940a1b87d54SArd Biesheuvel setup_quirks(boot_params); 941c2d0b470SArd Biesheuvel 942c0461bd1SDionna Glaze setup_unaccepted_memory(); 943c0461bd1SDionna Glaze 944c2d0b470SArd Biesheuvel status = exit_boot(boot_params, handle); 945c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 94636bdd0a7SArvind Sankar efi_err("exit_boot() failed!\n"); 947c2d0b470SArd Biesheuvel goto fail; 948c2d0b470SArd Biesheuvel } 949c2d0b470SArd Biesheuvel 950a1b87d54SArd Biesheuvel /* 951a1b87d54SArd Biesheuvel * Call the SEV init code while still running with the firmware's 952a1b87d54SArd Biesheuvel * GDT/IDT, so #VC exceptions will be handled by EFI. 953a1b87d54SArd Biesheuvel */ 954a1b87d54SArd Biesheuvel sev_enable(boot_params); 955a1b87d54SArd Biesheuvel 956cb1c9e02SArd Biesheuvel efi_5level_switch(); 957cb1c9e02SArd Biesheuvel 958a1b87d54SArd Biesheuvel enter_kernel(kernel_entry, boot_params); 959c2d0b470SArd Biesheuvel fail: 960df9215f1SArd Biesheuvel efi_err("efi_stub_entry() failed!\n"); 961c2d0b470SArd Biesheuvel 9623b8f44fcSArd Biesheuvel efi_exit(handle, status); 963c2d0b470SArd Biesheuvel } 964df9215f1SArd Biesheuvel 965df9215f1SArd Biesheuvel #ifdef CONFIG_EFI_HANDOVER_PROTOCOL 966d7156b98SArd Biesheuvel void efi_handover_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg, 967d7156b98SArd Biesheuvel struct boot_params *boot_params) 968d7156b98SArd Biesheuvel { 969d7156b98SArd Biesheuvel extern char _bss[], _ebss[]; 970d7156b98SArd Biesheuvel 971d7156b98SArd Biesheuvel memset(_bss, 0, _ebss - _bss); 972d7156b98SArd Biesheuvel efi_stub_entry(handle, sys_table_arg, boot_params); 973d7156b98SArd Biesheuvel } 974d7156b98SArd Biesheuvel 975df9215f1SArd Biesheuvel #ifndef CONFIG_EFI_MIXED 976d7156b98SArd Biesheuvel extern __alias(efi_handover_entry) 977df9215f1SArd Biesheuvel void efi32_stub_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg, 978df9215f1SArd Biesheuvel struct boot_params *boot_params); 979df9215f1SArd Biesheuvel 980d7156b98SArd Biesheuvel extern __alias(efi_handover_entry) 981df9215f1SArd Biesheuvel void efi64_stub_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg, 982df9215f1SArd Biesheuvel struct boot_params *boot_params); 983df9215f1SArd Biesheuvel #endif 984df9215f1SArd Biesheuvel #endif 985