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 226*c756fd5dSArd Biesheuvel efi_status_t 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) { 239*c756fd5dSArd Biesheuvel status = efi_call_proto(memattr, clear_memory_attributes, 240*c756fd5dSArd Biesheuvel rounded_start, 241*c756fd5dSArd Biesheuvel rounded_end - rounded_start, 242*c756fd5dSArd Biesheuvel EFI_MEMORY_XP); 243*c756fd5dSArd Biesheuvel if (status != EFI_SUCCESS) 244*c756fd5dSArd Biesheuvel efi_warn("Failed to clear EFI_MEMORY_XP attribute\n"); 245*c756fd5dSArd Biesheuvel return status; 24611078876SArd Biesheuvel } 24711078876SArd Biesheuvel 24811078876SArd Biesheuvel if (efi_dxe_table == NULL) 249*c756fd5dSArd Biesheuvel return EFI_SUCCESS; 25011078876SArd Biesheuvel 25182e0d6d7SBaskov Evgeniy /* 25282e0d6d7SBaskov Evgeniy * Don't modify memory region attributes, they are 25382e0d6d7SBaskov Evgeniy * already suitable, to lower the possibility to 25482e0d6d7SBaskov Evgeniy * encounter firmware bugs. 25582e0d6d7SBaskov Evgeniy */ 25682e0d6d7SBaskov Evgeniy 25782e0d6d7SBaskov Evgeniy for (end = start + size; start < end; start = next) { 25882e0d6d7SBaskov Evgeniy 25982e0d6d7SBaskov Evgeniy status = efi_dxe_call(get_memory_space_descriptor, start, &desc); 26082e0d6d7SBaskov Evgeniy 26182e0d6d7SBaskov Evgeniy if (status != EFI_SUCCESS) 262*c756fd5dSArd Biesheuvel break; 26382e0d6d7SBaskov Evgeniy 26482e0d6d7SBaskov Evgeniy next = desc.base_address + desc.length; 26582e0d6d7SBaskov Evgeniy 26682e0d6d7SBaskov Evgeniy /* 26782e0d6d7SBaskov Evgeniy * Only system memory is suitable for trampoline/kernel image placement, 26882e0d6d7SBaskov Evgeniy * so only this type of memory needs its attributes to be modified. 26982e0d6d7SBaskov Evgeniy */ 27082e0d6d7SBaskov Evgeniy 27182e0d6d7SBaskov Evgeniy if (desc.gcd_memory_type != EfiGcdMemoryTypeSystemMemory || 27282e0d6d7SBaskov Evgeniy (desc.attributes & (EFI_MEMORY_RO | EFI_MEMORY_XP)) == 0) 27382e0d6d7SBaskov Evgeniy continue; 27482e0d6d7SBaskov Evgeniy 27582e0d6d7SBaskov Evgeniy unprotect_start = max(rounded_start, (unsigned long)desc.base_address); 27682e0d6d7SBaskov Evgeniy unprotect_size = min(rounded_end, next) - unprotect_start; 27782e0d6d7SBaskov Evgeniy 27882e0d6d7SBaskov Evgeniy status = efi_dxe_call(set_memory_space_attributes, 27982e0d6d7SBaskov Evgeniy unprotect_start, unprotect_size, 28082e0d6d7SBaskov Evgeniy EFI_MEMORY_WB); 28182e0d6d7SBaskov Evgeniy 28282e0d6d7SBaskov Evgeniy if (status != EFI_SUCCESS) { 28331f1a0edSArd Biesheuvel efi_warn("Unable to unprotect memory range [%08lx,%08lx]: %lx\n", 28482e0d6d7SBaskov Evgeniy unprotect_start, 28582e0d6d7SBaskov Evgeniy unprotect_start + unprotect_size, 28631f1a0edSArd Biesheuvel status); 287*c756fd5dSArd Biesheuvel break; 28882e0d6d7SBaskov Evgeniy } 28982e0d6d7SBaskov Evgeniy } 290*c756fd5dSArd Biesheuvel return EFI_SUCCESS; 29182e0d6d7SBaskov Evgeniy } 29282e0d6d7SBaskov Evgeniy 293c0461bd1SDionna Glaze static void setup_unaccepted_memory(void) 294c0461bd1SDionna Glaze { 295c0461bd1SDionna Glaze efi_guid_t mem_acceptance_proto = OVMF_SEV_MEMORY_ACCEPTANCE_PROTOCOL_GUID; 296c0461bd1SDionna Glaze sev_memory_acceptance_protocol_t *proto; 297c0461bd1SDionna Glaze efi_status_t status; 298c0461bd1SDionna Glaze 299c0461bd1SDionna Glaze if (!IS_ENABLED(CONFIG_UNACCEPTED_MEMORY)) 300c0461bd1SDionna Glaze return; 301c0461bd1SDionna Glaze 302c0461bd1SDionna Glaze /* 303c0461bd1SDionna Glaze * Enable unaccepted memory before calling exit boot services in order 304c0461bd1SDionna Glaze * for the UEFI to not accept all memory on EBS. 305c0461bd1SDionna Glaze */ 306c0461bd1SDionna Glaze status = efi_bs_call(locate_protocol, &mem_acceptance_proto, NULL, 307c0461bd1SDionna Glaze (void **)&proto); 308c0461bd1SDionna Glaze if (status != EFI_SUCCESS) 309c0461bd1SDionna Glaze return; 310c0461bd1SDionna Glaze 311c0461bd1SDionna Glaze status = efi_call_proto(proto, allow_unaccepted_memory); 312c0461bd1SDionna Glaze if (status != EFI_SUCCESS) 313c0461bd1SDionna Glaze efi_err("Memory acceptance protocol failed\n"); 314c0461bd1SDionna Glaze } 315c0461bd1SDionna Glaze 316800f84d8SArd Biesheuvel static efi_char16_t *efistub_fw_vendor(void) 317800f84d8SArd Biesheuvel { 318800f84d8SArd Biesheuvel unsigned long vendor = efi_table_attr(efi_system_table, fw_vendor); 319800f84d8SArd Biesheuvel 320800f84d8SArd Biesheuvel return (efi_char16_t *)vendor; 321800f84d8SArd Biesheuvel } 322800f84d8SArd Biesheuvel 323c2d0b470SArd Biesheuvel static const efi_char16_t apple[] = L"Apple"; 324c2d0b470SArd Biesheuvel 325a1b87d54SArd Biesheuvel static void setup_quirks(struct boot_params *boot_params) 326c2d0b470SArd Biesheuvel { 327800f84d8SArd Biesheuvel if (IS_ENABLED(CONFIG_APPLE_PROPERTIES) && 328800f84d8SArd Biesheuvel !memcmp(efistub_fw_vendor(), apple, sizeof(apple))) 329c2d0b470SArd Biesheuvel retrieve_apple_device_properties(boot_params); 330c2d0b470SArd Biesheuvel } 331c2d0b470SArd Biesheuvel 332c2d0b470SArd Biesheuvel /* 333c2d0b470SArd Biesheuvel * See if we have Universal Graphics Adapter (UGA) protocol 334c2d0b470SArd Biesheuvel */ 335c2d0b470SArd Biesheuvel static efi_status_t 336c2d0b470SArd Biesheuvel setup_uga(struct screen_info *si, efi_guid_t *uga_proto, unsigned long size) 337c2d0b470SArd Biesheuvel { 338c2d0b470SArd Biesheuvel efi_status_t status; 339c2d0b470SArd Biesheuvel u32 width, height; 340c2d0b470SArd Biesheuvel void **uga_handle = NULL; 341c2d0b470SArd Biesheuvel efi_uga_draw_protocol_t *uga = NULL, *first_uga; 342c2d0b470SArd Biesheuvel efi_handle_t handle; 343c2d0b470SArd Biesheuvel int i; 344c2d0b470SArd Biesheuvel 345c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 346c2d0b470SArd Biesheuvel (void **)&uga_handle); 347c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 348c2d0b470SArd Biesheuvel return status; 349c2d0b470SArd Biesheuvel 350c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 351c2d0b470SArd Biesheuvel uga_proto, NULL, &size, uga_handle); 352c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 353c2d0b470SArd Biesheuvel goto free_handle; 354c2d0b470SArd Biesheuvel 355c2d0b470SArd Biesheuvel height = 0; 356c2d0b470SArd Biesheuvel width = 0; 357c2d0b470SArd Biesheuvel 358c2d0b470SArd Biesheuvel first_uga = NULL; 359c2d0b470SArd Biesheuvel for_each_efi_handle(handle, uga_handle, size, i) { 360c2d0b470SArd Biesheuvel efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID; 361c2d0b470SArd Biesheuvel u32 w, h, depth, refresh; 362c2d0b470SArd Biesheuvel void *pciio; 363c2d0b470SArd Biesheuvel 364c2d0b470SArd Biesheuvel status = efi_bs_call(handle_protocol, handle, uga_proto, 365c2d0b470SArd Biesheuvel (void **)&uga); 366c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 367c2d0b470SArd Biesheuvel continue; 368c2d0b470SArd Biesheuvel 369c2d0b470SArd Biesheuvel pciio = NULL; 370c2d0b470SArd Biesheuvel efi_bs_call(handle_protocol, handle, &pciio_proto, &pciio); 371c2d0b470SArd Biesheuvel 372c2d0b470SArd Biesheuvel status = efi_call_proto(uga, get_mode, &w, &h, &depth, &refresh); 373c2d0b470SArd Biesheuvel if (status == EFI_SUCCESS && (!first_uga || pciio)) { 374c2d0b470SArd Biesheuvel width = w; 375c2d0b470SArd Biesheuvel height = h; 376c2d0b470SArd Biesheuvel 377c2d0b470SArd Biesheuvel /* 378c2d0b470SArd Biesheuvel * Once we've found a UGA supporting PCIIO, 379c2d0b470SArd Biesheuvel * don't bother looking any further. 380c2d0b470SArd Biesheuvel */ 381c2d0b470SArd Biesheuvel if (pciio) 382c2d0b470SArd Biesheuvel break; 383c2d0b470SArd Biesheuvel 384c2d0b470SArd Biesheuvel first_uga = uga; 385c2d0b470SArd Biesheuvel } 386c2d0b470SArd Biesheuvel } 387c2d0b470SArd Biesheuvel 388c2d0b470SArd Biesheuvel if (!width && !height) 389c2d0b470SArd Biesheuvel goto free_handle; 390c2d0b470SArd Biesheuvel 391c2d0b470SArd Biesheuvel /* EFI framebuffer */ 392c2d0b470SArd Biesheuvel si->orig_video_isVGA = VIDEO_TYPE_EFI; 393c2d0b470SArd Biesheuvel 394c2d0b470SArd Biesheuvel si->lfb_depth = 32; 395c2d0b470SArd Biesheuvel si->lfb_width = width; 396c2d0b470SArd Biesheuvel si->lfb_height = height; 397c2d0b470SArd Biesheuvel 398c2d0b470SArd Biesheuvel si->red_size = 8; 399c2d0b470SArd Biesheuvel si->red_pos = 16; 400c2d0b470SArd Biesheuvel si->green_size = 8; 401c2d0b470SArd Biesheuvel si->green_pos = 8; 402c2d0b470SArd Biesheuvel si->blue_size = 8; 403c2d0b470SArd Biesheuvel si->blue_pos = 0; 404c2d0b470SArd Biesheuvel si->rsvd_size = 8; 405c2d0b470SArd Biesheuvel si->rsvd_pos = 24; 406c2d0b470SArd Biesheuvel 407c2d0b470SArd Biesheuvel free_handle: 408c2d0b470SArd Biesheuvel efi_bs_call(free_pool, uga_handle); 409c2d0b470SArd Biesheuvel 410c2d0b470SArd Biesheuvel return status; 411c2d0b470SArd Biesheuvel } 412c2d0b470SArd Biesheuvel 413c2d0b470SArd Biesheuvel static void setup_graphics(struct boot_params *boot_params) 414c2d0b470SArd Biesheuvel { 415c2d0b470SArd Biesheuvel efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID; 416c2d0b470SArd Biesheuvel struct screen_info *si; 417c2d0b470SArd Biesheuvel efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID; 418c2d0b470SArd Biesheuvel efi_status_t status; 419c2d0b470SArd Biesheuvel unsigned long size; 420c2d0b470SArd Biesheuvel void **gop_handle = NULL; 421c2d0b470SArd Biesheuvel void **uga_handle = NULL; 422c2d0b470SArd Biesheuvel 423c2d0b470SArd Biesheuvel si = &boot_params->screen_info; 424c2d0b470SArd Biesheuvel memset(si, 0, sizeof(*si)); 425c2d0b470SArd Biesheuvel 426c2d0b470SArd Biesheuvel size = 0; 427c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 428c2d0b470SArd Biesheuvel &graphics_proto, NULL, &size, gop_handle); 429c2d0b470SArd Biesheuvel if (status == EFI_BUFFER_TOO_SMALL) 430c2d0b470SArd Biesheuvel status = efi_setup_gop(si, &graphics_proto, size); 431c2d0b470SArd Biesheuvel 432c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 433c2d0b470SArd Biesheuvel size = 0; 434c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 435c2d0b470SArd Biesheuvel &uga_proto, NULL, &size, uga_handle); 436c2d0b470SArd Biesheuvel if (status == EFI_BUFFER_TOO_SMALL) 437c2d0b470SArd Biesheuvel setup_uga(si, &uga_proto, size); 438c2d0b470SArd Biesheuvel } 439c2d0b470SArd Biesheuvel } 440c2d0b470SArd Biesheuvel 4413b8f44fcSArd Biesheuvel 4423b8f44fcSArd Biesheuvel static void __noreturn efi_exit(efi_handle_t handle, efi_status_t status) 4433b8f44fcSArd Biesheuvel { 4443b8f44fcSArd Biesheuvel efi_bs_call(exit, handle, status, 0, NULL); 445f3fa0efcSArd Biesheuvel for(;;) 446f3fa0efcSArd Biesheuvel asm("hlt"); 4473b8f44fcSArd Biesheuvel } 4483b8f44fcSArd Biesheuvel 449c2d0b470SArd Biesheuvel void __noreturn efi_stub_entry(efi_handle_t handle, 450c2d0b470SArd Biesheuvel efi_system_table_t *sys_table_arg, 451c2d0b470SArd Biesheuvel struct boot_params *boot_params); 452c2d0b470SArd Biesheuvel 453c2d0b470SArd Biesheuvel /* 454c2d0b470SArd Biesheuvel * Because the x86 boot code expects to be passed a boot_params we 455c2d0b470SArd Biesheuvel * need to create one ourselves (usually the bootloader would create 456c2d0b470SArd Biesheuvel * one for us). 457c2d0b470SArd Biesheuvel */ 458c2d0b470SArd Biesheuvel efi_status_t __efiapi efi_pe_entry(efi_handle_t handle, 459c2d0b470SArd Biesheuvel efi_system_table_t *sys_table_arg) 460c2d0b470SArd Biesheuvel { 461c2d0b470SArd Biesheuvel struct boot_params *boot_params; 462c2d0b470SArd Biesheuvel struct setup_header *hdr; 4631887c9b6SArvind Sankar void *image_base; 464c2d0b470SArd Biesheuvel efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID; 465c2d0b470SArd Biesheuvel int options_size = 0; 466c2d0b470SArd Biesheuvel efi_status_t status; 467c2d0b470SArd Biesheuvel char *cmdline_ptr; 468c2d0b470SArd Biesheuvel 469ccc27ae7SArd Biesheuvel efi_system_table = sys_table_arg; 470c2d0b470SArd Biesheuvel 471c2d0b470SArd Biesheuvel /* Check if we were booted by the EFI firmware */ 472ccc27ae7SArd Biesheuvel if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) 4733b8f44fcSArd Biesheuvel efi_exit(handle, EFI_INVALID_PARAMETER); 474c2d0b470SArd Biesheuvel 4750347d8c2SArvind Sankar status = efi_bs_call(handle_protocol, handle, &proto, (void **)&image); 476c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 47736bdd0a7SArvind Sankar efi_err("Failed to get handle for LOADED_IMAGE_PROTOCOL\n"); 4783b8f44fcSArd Biesheuvel efi_exit(handle, status); 479c2d0b470SArd Biesheuvel } 480c2d0b470SArd Biesheuvel 4811887c9b6SArvind Sankar image_base = efi_table_attr(image, image_base); 4821887c9b6SArvind Sankar 483019512f1SArvind Sankar status = efi_allocate_pages(sizeof(struct boot_params), 484019512f1SArvind Sankar (unsigned long *)&boot_params, ULONG_MAX); 485c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 48636bdd0a7SArvind Sankar efi_err("Failed to allocate lowmem for boot params\n"); 4873b8f44fcSArd Biesheuvel efi_exit(handle, status); 488c2d0b470SArd Biesheuvel } 489c2d0b470SArd Biesheuvel 490019512f1SArvind Sankar memset(boot_params, 0x0, sizeof(struct boot_params)); 491c2d0b470SArd Biesheuvel 492c2d0b470SArd Biesheuvel hdr = &boot_params->hdr; 493c2d0b470SArd Biesheuvel 49459476f80SArvind Sankar /* Copy the setup header from the second sector to boot_params */ 49559476f80SArvind Sankar memcpy(&hdr->jump, image_base + 512, 49659476f80SArvind Sankar sizeof(struct setup_header) - offsetof(struct setup_header, jump)); 497c2d0b470SArd Biesheuvel 498c2d0b470SArd Biesheuvel /* 499c2d0b470SArd Biesheuvel * Fill out some of the header fields ourselves because the 500c2d0b470SArd Biesheuvel * EFI firmware loader doesn't load the first sector. 501c2d0b470SArd Biesheuvel */ 502c2d0b470SArd Biesheuvel hdr->root_flags = 1; 503c2d0b470SArd Biesheuvel hdr->vid_mode = 0xffff; 504c2d0b470SArd Biesheuvel hdr->boot_flag = 0xAA55; 505c2d0b470SArd Biesheuvel 506c2d0b470SArd Biesheuvel hdr->type_of_loader = 0x21; 507c2d0b470SArd Biesheuvel 508c2d0b470SArd Biesheuvel /* Convert unicode cmdline to ascii */ 50927cd5511SArd Biesheuvel cmdline_ptr = efi_convert_cmdline(image, &options_size); 510c2d0b470SArd Biesheuvel if (!cmdline_ptr) 511c2d0b470SArd Biesheuvel goto fail; 512c2d0b470SArd Biesheuvel 513eed4e019SArvind Sankar efi_set_u64_split((unsigned long)cmdline_ptr, 514eed4e019SArvind Sankar &hdr->cmd_line_ptr, &boot_params->ext_cmd_line_ptr); 515c2d0b470SArd Biesheuvel 516c2d0b470SArd Biesheuvel hdr->ramdisk_image = 0; 517c2d0b470SArd Biesheuvel hdr->ramdisk_size = 0; 518c2d0b470SArd Biesheuvel 51963bf28ceSArd Biesheuvel /* 52063bf28ceSArd Biesheuvel * Disregard any setup data that was provided by the bootloader: 52163bf28ceSArd Biesheuvel * setup_data could be pointing anywhere, and we have no way of 52263bf28ceSArd Biesheuvel * authenticating or validating the payload. 52363bf28ceSArd Biesheuvel */ 52463bf28ceSArd Biesheuvel hdr->setup_data = 0; 52563bf28ceSArd Biesheuvel 526ccc27ae7SArd Biesheuvel efi_stub_entry(handle, sys_table_arg, boot_params); 527c2d0b470SArd Biesheuvel /* not reached */ 528c2d0b470SArd Biesheuvel 529c2d0b470SArd Biesheuvel fail: 530019512f1SArvind Sankar efi_free(sizeof(struct boot_params), (unsigned long)boot_params); 531c2d0b470SArd Biesheuvel 5323b8f44fcSArd Biesheuvel efi_exit(handle, status); 533c2d0b470SArd Biesheuvel } 534c2d0b470SArd Biesheuvel 535c2d0b470SArd Biesheuvel static void add_e820ext(struct boot_params *params, 536c2d0b470SArd Biesheuvel struct setup_data *e820ext, u32 nr_entries) 537c2d0b470SArd Biesheuvel { 538c2d0b470SArd Biesheuvel struct setup_data *data; 539c2d0b470SArd Biesheuvel 540c2d0b470SArd Biesheuvel e820ext->type = SETUP_E820_EXT; 541c2d0b470SArd Biesheuvel e820ext->len = nr_entries * sizeof(struct boot_e820_entry); 542c2d0b470SArd Biesheuvel e820ext->next = 0; 543c2d0b470SArd Biesheuvel 544c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)params->hdr.setup_data; 545c2d0b470SArd Biesheuvel 546c2d0b470SArd Biesheuvel while (data && data->next) 547c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)data->next; 548c2d0b470SArd Biesheuvel 549c2d0b470SArd Biesheuvel if (data) 550c2d0b470SArd Biesheuvel data->next = (unsigned long)e820ext; 551c2d0b470SArd Biesheuvel else 552c2d0b470SArd Biesheuvel params->hdr.setup_data = (unsigned long)e820ext; 553c2d0b470SArd Biesheuvel } 554c2d0b470SArd Biesheuvel 555c2d0b470SArd Biesheuvel static efi_status_t 556c2d0b470SArd Biesheuvel setup_e820(struct boot_params *params, struct setup_data *e820ext, u32 e820ext_size) 557c2d0b470SArd Biesheuvel { 558c2d0b470SArd Biesheuvel struct boot_e820_entry *entry = params->e820_table; 559c2d0b470SArd Biesheuvel struct efi_info *efi = ¶ms->efi_info; 560c2d0b470SArd Biesheuvel struct boot_e820_entry *prev = NULL; 561c2d0b470SArd Biesheuvel u32 nr_entries; 562c2d0b470SArd Biesheuvel u32 nr_desc; 563c2d0b470SArd Biesheuvel int i; 564c2d0b470SArd Biesheuvel 565c2d0b470SArd Biesheuvel nr_entries = 0; 566c2d0b470SArd Biesheuvel nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size; 567c2d0b470SArd Biesheuvel 568c2d0b470SArd Biesheuvel for (i = 0; i < nr_desc; i++) { 569c2d0b470SArd Biesheuvel efi_memory_desc_t *d; 570c2d0b470SArd Biesheuvel unsigned int e820_type = 0; 571c2d0b470SArd Biesheuvel unsigned long m = efi->efi_memmap; 572c2d0b470SArd Biesheuvel 573c2d0b470SArd Biesheuvel #ifdef CONFIG_X86_64 574c2d0b470SArd Biesheuvel m |= (u64)efi->efi_memmap_hi << 32; 575c2d0b470SArd Biesheuvel #endif 576c2d0b470SArd Biesheuvel 577c2d0b470SArd Biesheuvel d = efi_early_memdesc_ptr(m, efi->efi_memdesc_size, i); 578c2d0b470SArd Biesheuvel switch (d->type) { 579c2d0b470SArd Biesheuvel case EFI_RESERVED_TYPE: 580c2d0b470SArd Biesheuvel case EFI_RUNTIME_SERVICES_CODE: 581c2d0b470SArd Biesheuvel case EFI_RUNTIME_SERVICES_DATA: 582c2d0b470SArd Biesheuvel case EFI_MEMORY_MAPPED_IO: 583c2d0b470SArd Biesheuvel case EFI_MEMORY_MAPPED_IO_PORT_SPACE: 584c2d0b470SArd Biesheuvel case EFI_PAL_CODE: 585c2d0b470SArd Biesheuvel e820_type = E820_TYPE_RESERVED; 586c2d0b470SArd Biesheuvel break; 587c2d0b470SArd Biesheuvel 588c2d0b470SArd Biesheuvel case EFI_UNUSABLE_MEMORY: 589c2d0b470SArd Biesheuvel e820_type = E820_TYPE_UNUSABLE; 590c2d0b470SArd Biesheuvel break; 591c2d0b470SArd Biesheuvel 592c2d0b470SArd Biesheuvel case EFI_ACPI_RECLAIM_MEMORY: 593c2d0b470SArd Biesheuvel e820_type = E820_TYPE_ACPI; 594c2d0b470SArd Biesheuvel break; 595c2d0b470SArd Biesheuvel 596c2d0b470SArd Biesheuvel case EFI_LOADER_CODE: 597c2d0b470SArd Biesheuvel case EFI_LOADER_DATA: 598c2d0b470SArd Biesheuvel case EFI_BOOT_SERVICES_CODE: 599c2d0b470SArd Biesheuvel case EFI_BOOT_SERVICES_DATA: 600c2d0b470SArd Biesheuvel case EFI_CONVENTIONAL_MEMORY: 601c2d0b470SArd Biesheuvel if (efi_soft_reserve_enabled() && 602c2d0b470SArd Biesheuvel (d->attribute & EFI_MEMORY_SP)) 603c2d0b470SArd Biesheuvel e820_type = E820_TYPE_SOFT_RESERVED; 604c2d0b470SArd Biesheuvel else 605c2d0b470SArd Biesheuvel e820_type = E820_TYPE_RAM; 606c2d0b470SArd Biesheuvel break; 607c2d0b470SArd Biesheuvel 608c2d0b470SArd Biesheuvel case EFI_ACPI_MEMORY_NVS: 609c2d0b470SArd Biesheuvel e820_type = E820_TYPE_NVS; 610c2d0b470SArd Biesheuvel break; 611c2d0b470SArd Biesheuvel 612c2d0b470SArd Biesheuvel case EFI_PERSISTENT_MEMORY: 613c2d0b470SArd Biesheuvel e820_type = E820_TYPE_PMEM; 614c2d0b470SArd Biesheuvel break; 615c2d0b470SArd Biesheuvel 616745e3ed8SKirill A. Shutemov case EFI_UNACCEPTED_MEMORY: 617ff07186bSNikolay Borisov if (!IS_ENABLED(CONFIG_UNACCEPTED_MEMORY)) 618745e3ed8SKirill A. Shutemov continue; 619745e3ed8SKirill A. Shutemov e820_type = E820_TYPE_RAM; 620745e3ed8SKirill A. Shutemov process_unaccepted_memory(d->phys_addr, 621745e3ed8SKirill A. Shutemov d->phys_addr + PAGE_SIZE * d->num_pages); 622745e3ed8SKirill A. Shutemov break; 623c2d0b470SArd Biesheuvel default: 624c2d0b470SArd Biesheuvel continue; 625c2d0b470SArd Biesheuvel } 626c2d0b470SArd Biesheuvel 627c2d0b470SArd Biesheuvel /* Merge adjacent mappings */ 628c2d0b470SArd Biesheuvel if (prev && prev->type == e820_type && 629c2d0b470SArd Biesheuvel (prev->addr + prev->size) == d->phys_addr) { 630c2d0b470SArd Biesheuvel prev->size += d->num_pages << 12; 631c2d0b470SArd Biesheuvel continue; 632c2d0b470SArd Biesheuvel } 633c2d0b470SArd Biesheuvel 634c2d0b470SArd Biesheuvel if (nr_entries == ARRAY_SIZE(params->e820_table)) { 635c2d0b470SArd Biesheuvel u32 need = (nr_desc - i) * sizeof(struct e820_entry) + 636c2d0b470SArd Biesheuvel sizeof(struct setup_data); 637c2d0b470SArd Biesheuvel 638c2d0b470SArd Biesheuvel if (!e820ext || e820ext_size < need) 639c2d0b470SArd Biesheuvel return EFI_BUFFER_TOO_SMALL; 640c2d0b470SArd Biesheuvel 641c2d0b470SArd Biesheuvel /* boot_params map full, switch to e820 extended */ 642c2d0b470SArd Biesheuvel entry = (struct boot_e820_entry *)e820ext->data; 643c2d0b470SArd Biesheuvel } 644c2d0b470SArd Biesheuvel 645c2d0b470SArd Biesheuvel entry->addr = d->phys_addr; 646c2d0b470SArd Biesheuvel entry->size = d->num_pages << PAGE_SHIFT; 647c2d0b470SArd Biesheuvel entry->type = e820_type; 648c2d0b470SArd Biesheuvel prev = entry++; 649c2d0b470SArd Biesheuvel nr_entries++; 650c2d0b470SArd Biesheuvel } 651c2d0b470SArd Biesheuvel 652c2d0b470SArd Biesheuvel if (nr_entries > ARRAY_SIZE(params->e820_table)) { 653c2d0b470SArd Biesheuvel u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_table); 654c2d0b470SArd Biesheuvel 655c2d0b470SArd Biesheuvel add_e820ext(params, e820ext, nr_e820ext); 656c2d0b470SArd Biesheuvel nr_entries -= nr_e820ext; 657c2d0b470SArd Biesheuvel } 658c2d0b470SArd Biesheuvel 659c2d0b470SArd Biesheuvel params->e820_entries = (u8)nr_entries; 660c2d0b470SArd Biesheuvel 661c2d0b470SArd Biesheuvel return EFI_SUCCESS; 662c2d0b470SArd Biesheuvel } 663c2d0b470SArd Biesheuvel 664c2d0b470SArd Biesheuvel static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext, 665c2d0b470SArd Biesheuvel u32 *e820ext_size) 666c2d0b470SArd Biesheuvel { 667c2d0b470SArd Biesheuvel efi_status_t status; 668c2d0b470SArd Biesheuvel unsigned long size; 669c2d0b470SArd Biesheuvel 670c2d0b470SArd Biesheuvel size = sizeof(struct setup_data) + 671c2d0b470SArd Biesheuvel sizeof(struct e820_entry) * nr_desc; 672c2d0b470SArd Biesheuvel 673c2d0b470SArd Biesheuvel if (*e820ext) { 674c2d0b470SArd Biesheuvel efi_bs_call(free_pool, *e820ext); 675c2d0b470SArd Biesheuvel *e820ext = NULL; 676c2d0b470SArd Biesheuvel *e820ext_size = 0; 677c2d0b470SArd Biesheuvel } 678c2d0b470SArd Biesheuvel 679c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 680c2d0b470SArd Biesheuvel (void **)e820ext); 681c2d0b470SArd Biesheuvel if (status == EFI_SUCCESS) 682c2d0b470SArd Biesheuvel *e820ext_size = size; 683c2d0b470SArd Biesheuvel 684c2d0b470SArd Biesheuvel return status; 685c2d0b470SArd Biesheuvel } 686c2d0b470SArd Biesheuvel 687c2d0b470SArd Biesheuvel static efi_status_t allocate_e820(struct boot_params *params, 688c2d0b470SArd Biesheuvel struct setup_data **e820ext, 689c2d0b470SArd Biesheuvel u32 *e820ext_size) 690c2d0b470SArd Biesheuvel { 6912e9f46eeSKirill A. Shutemov struct efi_boot_memmap *map; 692c2d0b470SArd Biesheuvel efi_status_t status; 6932e9f46eeSKirill A. Shutemov __u32 nr_desc; 694c2d0b470SArd Biesheuvel 6952e9f46eeSKirill A. Shutemov status = efi_get_memory_map(&map, false); 696c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 697c2d0b470SArd Biesheuvel return status; 6982e9f46eeSKirill A. Shutemov 6992e9f46eeSKirill A. Shutemov nr_desc = map->map_size / map->desc_size; 7002e9f46eeSKirill A. Shutemov if (nr_desc > ARRAY_SIZE(params->e820_table) - EFI_MMAP_NR_SLACK_SLOTS) { 7012e9f46eeSKirill A. Shutemov u32 nr_e820ext = nr_desc - ARRAY_SIZE(params->e820_table) + 7022e9f46eeSKirill A. Shutemov EFI_MMAP_NR_SLACK_SLOTS; 7032e9f46eeSKirill A. Shutemov 7042e9f46eeSKirill A. Shutemov status = alloc_e820ext(nr_e820ext, e820ext, e820ext_size); 705c2d0b470SArd Biesheuvel } 706c2d0b470SArd Biesheuvel 707745e3ed8SKirill A. Shutemov if (IS_ENABLED(CONFIG_UNACCEPTED_MEMORY) && status == EFI_SUCCESS) 708745e3ed8SKirill A. Shutemov status = allocate_unaccepted_bitmap(nr_desc, map); 709745e3ed8SKirill A. Shutemov 7102e9f46eeSKirill A. Shutemov efi_bs_call(free_pool, map); 7112e9f46eeSKirill A. Shutemov return status; 712c2d0b470SArd Biesheuvel } 713c2d0b470SArd Biesheuvel 714c2d0b470SArd Biesheuvel struct exit_boot_struct { 715c2d0b470SArd Biesheuvel struct boot_params *boot_params; 716c2d0b470SArd Biesheuvel struct efi_info *efi; 717c2d0b470SArd Biesheuvel }; 718c2d0b470SArd Biesheuvel 719c2d0b470SArd Biesheuvel static efi_status_t exit_boot_func(struct efi_boot_memmap *map, 720c2d0b470SArd Biesheuvel void *priv) 721c2d0b470SArd Biesheuvel { 722c2d0b470SArd Biesheuvel const char *signature; 723c2d0b470SArd Biesheuvel struct exit_boot_struct *p = priv; 724c2d0b470SArd Biesheuvel 725c2d0b470SArd Biesheuvel signature = efi_is_64bit() ? EFI64_LOADER_SIGNATURE 726c2d0b470SArd Biesheuvel : EFI32_LOADER_SIGNATURE; 727c2d0b470SArd Biesheuvel memcpy(&p->efi->efi_loader_signature, signature, sizeof(__u32)); 728c2d0b470SArd Biesheuvel 729eed4e019SArvind Sankar efi_set_u64_split((unsigned long)efi_system_table, 730eed4e019SArvind Sankar &p->efi->efi_systab, &p->efi->efi_systab_hi); 731eab31265SArd Biesheuvel p->efi->efi_memdesc_size = map->desc_size; 732eab31265SArd Biesheuvel p->efi->efi_memdesc_version = map->desc_ver; 733eab31265SArd Biesheuvel efi_set_u64_split((unsigned long)map->map, 734eed4e019SArvind Sankar &p->efi->efi_memmap, &p->efi->efi_memmap_hi); 735eab31265SArd Biesheuvel p->efi->efi_memmap_size = map->map_size; 736c2d0b470SArd Biesheuvel 737c2d0b470SArd Biesheuvel return EFI_SUCCESS; 738c2d0b470SArd Biesheuvel } 739c2d0b470SArd Biesheuvel 740c2d0b470SArd Biesheuvel static efi_status_t exit_boot(struct boot_params *boot_params, void *handle) 741c2d0b470SArd Biesheuvel { 742c2d0b470SArd Biesheuvel struct setup_data *e820ext = NULL; 743c2d0b470SArd Biesheuvel __u32 e820ext_size = 0; 744c2d0b470SArd Biesheuvel efi_status_t status; 745c2d0b470SArd Biesheuvel struct exit_boot_struct priv; 746c2d0b470SArd Biesheuvel 747c2d0b470SArd Biesheuvel priv.boot_params = boot_params; 748c2d0b470SArd Biesheuvel priv.efi = &boot_params->efi_info; 749c2d0b470SArd Biesheuvel 750c2d0b470SArd Biesheuvel status = allocate_e820(boot_params, &e820ext, &e820ext_size); 751c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 752c2d0b470SArd Biesheuvel return status; 753c2d0b470SArd Biesheuvel 754c2d0b470SArd Biesheuvel /* Might as well exit boot services now */ 755eab31265SArd Biesheuvel status = efi_exit_boot_services(handle, &priv, exit_boot_func); 756c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 757c2d0b470SArd Biesheuvel return status; 758c2d0b470SArd Biesheuvel 759c2d0b470SArd Biesheuvel /* Historic? */ 760c2d0b470SArd Biesheuvel boot_params->alt_mem_k = 32 * 1024; 761c2d0b470SArd Biesheuvel 762c2d0b470SArd Biesheuvel status = setup_e820(boot_params, e820ext, e820ext_size); 763c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 764c2d0b470SArd Biesheuvel return status; 765c2d0b470SArd Biesheuvel 766c2d0b470SArd Biesheuvel return EFI_SUCCESS; 767c2d0b470SArd Biesheuvel } 768c2d0b470SArd Biesheuvel 76931c77a50SArd Biesheuvel static bool have_unsupported_snp_features(void) 77031c77a50SArd Biesheuvel { 77131c77a50SArd Biesheuvel u64 unsupported; 77231c77a50SArd Biesheuvel 77331c77a50SArd Biesheuvel unsupported = snp_get_unsupported_features(sev_get_status()); 77431c77a50SArd Biesheuvel if (unsupported) { 77531c77a50SArd Biesheuvel efi_err("Unsupported SEV-SNP features detected: 0x%llx\n", 77631c77a50SArd Biesheuvel unsupported); 77731c77a50SArd Biesheuvel return true; 77831c77a50SArd Biesheuvel } 77931c77a50SArd Biesheuvel return false; 78031c77a50SArd Biesheuvel } 78131c77a50SArd Biesheuvel 782a1b87d54SArd Biesheuvel static void efi_get_seed(void *seed, int size) 783a1b87d54SArd Biesheuvel { 784a1b87d54SArd Biesheuvel efi_get_random_bytes(size, seed); 785a1b87d54SArd Biesheuvel 786a1b87d54SArd Biesheuvel /* 787a1b87d54SArd Biesheuvel * This only updates seed[0] when running on 32-bit, but in that case, 788a1b87d54SArd Biesheuvel * seed[1] is not used anyway, as there is no virtual KASLR on 32-bit. 789a1b87d54SArd Biesheuvel */ 790a1b87d54SArd Biesheuvel *(unsigned long *)seed ^= kaslr_get_random_long("EFI"); 791a1b87d54SArd Biesheuvel } 792a1b87d54SArd Biesheuvel 793a1b87d54SArd Biesheuvel static void error(char *str) 794a1b87d54SArd Biesheuvel { 795a1b87d54SArd Biesheuvel efi_warn("Decompression failed: %s\n", str); 796a1b87d54SArd Biesheuvel } 797a1b87d54SArd Biesheuvel 798a1b87d54SArd Biesheuvel static efi_status_t efi_decompress_kernel(unsigned long *kernel_entry) 799a1b87d54SArd Biesheuvel { 800a1b87d54SArd Biesheuvel unsigned long virt_addr = LOAD_PHYSICAL_ADDR; 801a1b87d54SArd Biesheuvel unsigned long addr, alloc_size, entry; 802a1b87d54SArd Biesheuvel efi_status_t status; 803a1b87d54SArd Biesheuvel u32 seed[2] = {}; 804a1b87d54SArd Biesheuvel 805a1b87d54SArd Biesheuvel /* determine the required size of the allocation */ 806a1b87d54SArd Biesheuvel alloc_size = ALIGN(max_t(unsigned long, output_len, kernel_total_size), 807a1b87d54SArd Biesheuvel MIN_KERNEL_ALIGN); 808a1b87d54SArd Biesheuvel 809a1b87d54SArd Biesheuvel if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && !efi_nokaslr) { 810a1b87d54SArd Biesheuvel u64 range = KERNEL_IMAGE_SIZE - LOAD_PHYSICAL_ADDR - kernel_total_size; 811800f84d8SArd Biesheuvel static const efi_char16_t ami[] = L"American Megatrends"; 812a1b87d54SArd Biesheuvel 813a1b87d54SArd Biesheuvel efi_get_seed(seed, sizeof(seed)); 814a1b87d54SArd Biesheuvel 815a1b87d54SArd Biesheuvel virt_addr += (range * seed[1]) >> 32; 816a1b87d54SArd Biesheuvel virt_addr &= ~(CONFIG_PHYSICAL_ALIGN - 1); 817800f84d8SArd Biesheuvel 818800f84d8SArd Biesheuvel /* 819800f84d8SArd Biesheuvel * Older Dell systems with AMI UEFI firmware v2.0 may hang 820800f84d8SArd Biesheuvel * while decompressing the kernel if physical address 821800f84d8SArd Biesheuvel * randomization is enabled. 822800f84d8SArd Biesheuvel * 823800f84d8SArd Biesheuvel * https://bugzilla.kernel.org/show_bug.cgi?id=218173 824800f84d8SArd Biesheuvel */ 825800f84d8SArd Biesheuvel if (efi_system_table->hdr.revision <= EFI_2_00_SYSTEM_TABLE_REVISION && 826800f84d8SArd Biesheuvel !memcmp(efistub_fw_vendor(), ami, sizeof(ami))) { 827800f84d8SArd Biesheuvel efi_debug("AMI firmware v2.0 or older detected - disabling physical KASLR\n"); 828800f84d8SArd Biesheuvel seed[0] = 0; 829800f84d8SArd Biesheuvel } 830a1b87d54SArd Biesheuvel } 831a1b87d54SArd Biesheuvel 832a1b87d54SArd Biesheuvel status = efi_random_alloc(alloc_size, CONFIG_PHYSICAL_ALIGN, &addr, 833a1b87d54SArd Biesheuvel seed[0], EFI_LOADER_CODE, 834a1b87d54SArd Biesheuvel EFI_X86_KERNEL_ALLOC_LIMIT); 835a1b87d54SArd Biesheuvel if (status != EFI_SUCCESS) 836a1b87d54SArd Biesheuvel return status; 837a1b87d54SArd Biesheuvel 838a1b87d54SArd Biesheuvel entry = decompress_kernel((void *)addr, virt_addr, error); 839a1b87d54SArd Biesheuvel if (entry == ULONG_MAX) { 840a1b87d54SArd Biesheuvel efi_free(alloc_size, addr); 841a1b87d54SArd Biesheuvel return EFI_LOAD_ERROR; 842a1b87d54SArd Biesheuvel } 843a1b87d54SArd Biesheuvel 844a1b87d54SArd Biesheuvel *kernel_entry = addr + entry; 845a1b87d54SArd Biesheuvel 846*c756fd5dSArd Biesheuvel return efi_adjust_memory_range_protection(addr, kernel_total_size); 847a1b87d54SArd Biesheuvel } 848a1b87d54SArd Biesheuvel 849d2d7a54fSArd Biesheuvel static void __noreturn enter_kernel(unsigned long kernel_addr, 850d2d7a54fSArd Biesheuvel struct boot_params *boot_params) 851d2d7a54fSArd Biesheuvel { 852d2d7a54fSArd Biesheuvel /* enter decompressed kernel with boot_params pointer in RSI/ESI */ 853d2d7a54fSArd Biesheuvel asm("jmp *%0"::"r"(kernel_addr), "S"(boot_params)); 854d2d7a54fSArd Biesheuvel 855d2d7a54fSArd Biesheuvel unreachable(); 856d2d7a54fSArd Biesheuvel } 857d2d7a54fSArd Biesheuvel 858c2d0b470SArd Biesheuvel /* 859d2d7a54fSArd Biesheuvel * On success, this routine will jump to the relocated image directly and never 860d2d7a54fSArd Biesheuvel * return. On failure, it will exit to the firmware via efi_exit() instead of 861d2d7a54fSArd Biesheuvel * returning. 862c2d0b470SArd Biesheuvel */ 863df9215f1SArd Biesheuvel void __noreturn efi_stub_entry(efi_handle_t handle, 864c2d0b470SArd Biesheuvel efi_system_table_t *sys_table_arg, 865c2d0b470SArd Biesheuvel struct boot_params *boot_params) 866c2d0b470SArd Biesheuvel { 86711078876SArd Biesheuvel efi_guid_t guid = EFI_MEMORY_ATTRIBUTE_PROTOCOL_GUID; 868c2d0b470SArd Biesheuvel struct setup_header *hdr = &boot_params->hdr; 869f4dc7fffSArd Biesheuvel const struct linux_efi_initrd *initrd = NULL; 870a1b87d54SArd Biesheuvel unsigned long kernel_entry; 871c2d0b470SArd Biesheuvel efi_status_t status; 872c2d0b470SArd Biesheuvel 873db772413SArd Biesheuvel boot_params_pointer = boot_params; 874db772413SArd Biesheuvel 875ccc27ae7SArd Biesheuvel efi_system_table = sys_table_arg; 876c2d0b470SArd Biesheuvel /* Check if we were booted by the EFI firmware */ 877ccc27ae7SArd Biesheuvel if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) 8783b8f44fcSArd Biesheuvel efi_exit(handle, EFI_INVALID_PARAMETER); 879c2d0b470SArd Biesheuvel 88031c77a50SArd Biesheuvel if (have_unsupported_snp_features()) 88131c77a50SArd Biesheuvel efi_exit(handle, EFI_UNSUPPORTED); 88231c77a50SArd Biesheuvel 88311078876SArd Biesheuvel if (IS_ENABLED(CONFIG_EFI_DXE_MEM_ATTRIBUTES)) { 8843ba75c13SBaskov Evgeniy efi_dxe_table = get_efi_config_table(EFI_DXE_SERVICES_TABLE_GUID); 8853ba75c13SBaskov Evgeniy if (efi_dxe_table && 8863ba75c13SBaskov Evgeniy efi_dxe_table->hdr.signature != EFI_DXE_SERVICES_TABLE_SIGNATURE) { 8873ba75c13SBaskov Evgeniy efi_warn("Ignoring DXE services table: invalid signature\n"); 8883ba75c13SBaskov Evgeniy efi_dxe_table = NULL; 8893ba75c13SBaskov Evgeniy } 89011078876SArd Biesheuvel } 89111078876SArd Biesheuvel 89211078876SArd Biesheuvel /* grab the memory attributes protocol if it exists */ 89311078876SArd Biesheuvel efi_bs_call(locate_protocol, &guid, NULL, (void **)&memattr); 8943ba75c13SBaskov Evgeniy 895cb1c9e02SArd Biesheuvel status = efi_setup_5level_paging(); 896cb1c9e02SArd Biesheuvel if (status != EFI_SUCCESS) { 897cb1c9e02SArd Biesheuvel efi_err("efi_setup_5level_paging() failed!\n"); 898cb1c9e02SArd Biesheuvel goto fail; 899cb1c9e02SArd Biesheuvel } 900cb1c9e02SArd Biesheuvel 9017dde67f2SArvind Sankar #ifdef CONFIG_CMDLINE_BOOL 902055042beSArvind Sankar status = efi_parse_options(CONFIG_CMDLINE); 903055042beSArvind Sankar if (status != EFI_SUCCESS) { 904055042beSArvind Sankar efi_err("Failed to parse options\n"); 905055042beSArvind Sankar goto fail; 906055042beSArvind Sankar } 9077dde67f2SArvind Sankar #endif 9087dde67f2SArvind Sankar if (!IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) { 9097dde67f2SArvind Sankar unsigned long cmdline_paddr = ((u64)hdr->cmd_line_ptr | 910c2d0b470SArd Biesheuvel ((u64)boot_params->ext_cmd_line_ptr << 32)); 911055042beSArvind Sankar status = efi_parse_options((char *)cmdline_paddr); 912055042beSArvind Sankar if (status != EFI_SUCCESS) { 913055042beSArvind Sankar efi_err("Failed to parse options\n"); 914055042beSArvind Sankar goto fail; 915055042beSArvind Sankar } 9167dde67f2SArvind Sankar } 917c2d0b470SArd Biesheuvel 918a1b87d54SArd Biesheuvel status = efi_decompress_kernel(&kernel_entry); 919a1b87d54SArd Biesheuvel if (status != EFI_SUCCESS) { 920a1b87d54SArd Biesheuvel efi_err("Failed to decompress kernel\n"); 921a1b87d54SArd Biesheuvel goto fail; 922a1b87d54SArd Biesheuvel } 923a1b87d54SArd Biesheuvel 924c2d0b470SArd Biesheuvel /* 925987053a3SArvind Sankar * At this point, an initrd may already have been loaded by the 926987053a3SArvind Sankar * bootloader and passed via bootparams. We permit an initrd loaded 927987053a3SArvind Sankar * from the LINUX_EFI_INITRD_MEDIA_GUID device path to supersede it. 928987053a3SArvind Sankar * 929987053a3SArvind Sankar * If the device path is not present, any command-line initrd= 930987053a3SArvind Sankar * arguments will be processed only if image is not NULL, which will be 931987053a3SArvind Sankar * the case only if we were loaded via the PE entry point. 932ec93fc37SArd Biesheuvel */ 933f4dc7fffSArd Biesheuvel status = efi_load_initrd(image, hdr->initrd_addr_max, ULONG_MAX, 934f4dc7fffSArd Biesheuvel &initrd); 93520287d56SArd Biesheuvel if (status != EFI_SUCCESS) 936ec93fc37SArd Biesheuvel goto fail; 937f4dc7fffSArd Biesheuvel if (initrd && initrd->size > 0) { 938f4dc7fffSArd Biesheuvel efi_set_u64_split(initrd->base, &hdr->ramdisk_image, 939eed4e019SArvind Sankar &boot_params->ext_ramdisk_image); 940f4dc7fffSArd Biesheuvel efi_set_u64_split(initrd->size, &hdr->ramdisk_size, 941eed4e019SArvind Sankar &boot_params->ext_ramdisk_size); 94279d3219dSArd Biesheuvel } 943ec93fc37SArd Biesheuvel 944f4dc7fffSArd Biesheuvel 945ec93fc37SArd Biesheuvel /* 946c2d0b470SArd Biesheuvel * If the boot loader gave us a value for secure_boot then we use that, 947c2d0b470SArd Biesheuvel * otherwise we ask the BIOS. 948c2d0b470SArd Biesheuvel */ 949c2d0b470SArd Biesheuvel if (boot_params->secure_boot == efi_secureboot_mode_unset) 950c2d0b470SArd Biesheuvel boot_params->secure_boot = efi_get_secureboot(); 951c2d0b470SArd Biesheuvel 952c2d0b470SArd Biesheuvel /* Ask the firmware to clear memory on unclean shutdown */ 953c2d0b470SArd Biesheuvel efi_enable_reset_attack_mitigation(); 954c2d0b470SArd Biesheuvel 955c2d0b470SArd Biesheuvel efi_random_get_seed(); 956c2d0b470SArd Biesheuvel 957c2d0b470SArd Biesheuvel efi_retrieve_tpm2_eventlog(); 958c2d0b470SArd Biesheuvel 959c2d0b470SArd Biesheuvel setup_graphics(boot_params); 960c2d0b470SArd Biesheuvel 961c2d0b470SArd Biesheuvel setup_efi_pci(boot_params); 962c2d0b470SArd Biesheuvel 963a1b87d54SArd Biesheuvel setup_quirks(boot_params); 964c2d0b470SArd Biesheuvel 965c0461bd1SDionna Glaze setup_unaccepted_memory(); 966c0461bd1SDionna Glaze 967c2d0b470SArd Biesheuvel status = exit_boot(boot_params, handle); 968c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 96936bdd0a7SArvind Sankar efi_err("exit_boot() failed!\n"); 970c2d0b470SArd Biesheuvel goto fail; 971c2d0b470SArd Biesheuvel } 972c2d0b470SArd Biesheuvel 973a1b87d54SArd Biesheuvel /* 974a1b87d54SArd Biesheuvel * Call the SEV init code while still running with the firmware's 975a1b87d54SArd Biesheuvel * GDT/IDT, so #VC exceptions will be handled by EFI. 976a1b87d54SArd Biesheuvel */ 977a1b87d54SArd Biesheuvel sev_enable(boot_params); 978a1b87d54SArd Biesheuvel 979cb1c9e02SArd Biesheuvel efi_5level_switch(); 980cb1c9e02SArd Biesheuvel 981a1b87d54SArd Biesheuvel enter_kernel(kernel_entry, boot_params); 982c2d0b470SArd Biesheuvel fail: 983df9215f1SArd Biesheuvel efi_err("efi_stub_entry() failed!\n"); 984c2d0b470SArd Biesheuvel 9853b8f44fcSArd Biesheuvel efi_exit(handle, status); 986c2d0b470SArd Biesheuvel } 987df9215f1SArd Biesheuvel 988df9215f1SArd Biesheuvel #ifdef CONFIG_EFI_HANDOVER_PROTOCOL 989d7156b98SArd Biesheuvel void efi_handover_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg, 990d7156b98SArd Biesheuvel struct boot_params *boot_params) 991d7156b98SArd Biesheuvel { 992d7156b98SArd Biesheuvel extern char _bss[], _ebss[]; 993d7156b98SArd Biesheuvel 994d7156b98SArd Biesheuvel memset(_bss, 0, _ebss - _bss); 995d7156b98SArd Biesheuvel efi_stub_entry(handle, sys_table_arg, boot_params); 996d7156b98SArd Biesheuvel } 997d7156b98SArd Biesheuvel 998df9215f1SArd Biesheuvel #ifndef CONFIG_EFI_MIXED 999d7156b98SArd Biesheuvel extern __alias(efi_handover_entry) 1000df9215f1SArd Biesheuvel void efi32_stub_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg, 1001df9215f1SArd Biesheuvel struct boot_params *boot_params); 1002df9215f1SArd Biesheuvel 1003d7156b98SArd Biesheuvel extern __alias(efi_handover_entry) 1004df9215f1SArd Biesheuvel void efi64_stub_entry(efi_handle_t handle, efi_system_table_t *sys_table_arg, 1005df9215f1SArd Biesheuvel struct boot_params *boot_params); 1006df9215f1SArd Biesheuvel #endif 1007df9215f1SArd Biesheuvel #endif 1008