1c2d0b470SArd Biesheuvel // SPDX-License-Identifier: GPL-2.0-only 2c2d0b470SArd Biesheuvel 3c2d0b470SArd Biesheuvel /* ----------------------------------------------------------------------- 4c2d0b470SArd Biesheuvel * 5c2d0b470SArd Biesheuvel * Copyright 2011 Intel Corporation; author Matt Fleming 6c2d0b470SArd Biesheuvel * 7c2d0b470SArd Biesheuvel * ----------------------------------------------------------------------- */ 8c2d0b470SArd Biesheuvel 9c2d0b470SArd Biesheuvel #include <linux/efi.h> 10c2d0b470SArd Biesheuvel #include <linux/pci.h> 1159476f80SArvind Sankar #include <linux/stddef.h> 12c2d0b470SArd Biesheuvel 13c2d0b470SArd Biesheuvel #include <asm/efi.h> 14c2d0b470SArd Biesheuvel #include <asm/e820/types.h> 15c2d0b470SArd Biesheuvel #include <asm/setup.h> 16c2d0b470SArd Biesheuvel #include <asm/desc.h> 17c2d0b470SArd Biesheuvel #include <asm/boot.h> 18c2d0b470SArd Biesheuvel 19c2d0b470SArd Biesheuvel #include "efistub.h" 20c2d0b470SArd Biesheuvel 21d5cdf4cfSArvind Sankar /* Maximum physical address for 64-bit kernel with 4-level paging */ 22d5cdf4cfSArvind Sankar #define MAXMEM_X86_64_4LEVEL (1ull << 46) 23d5cdf4cfSArvind Sankar 24ccc27ae7SArd Biesheuvel const efi_system_table_t *efi_system_table; 25*3ba75c13SBaskov Evgeniy const efi_dxe_services_table_t *efi_dxe_table; 261887c9b6SArvind Sankar extern u32 image_offset; 27987053a3SArvind Sankar static efi_loaded_image_t *image = NULL; 28c2d0b470SArd Biesheuvel 29c2d0b470SArd Biesheuvel static efi_status_t 30c2d0b470SArd Biesheuvel preserve_pci_rom_image(efi_pci_io_protocol_t *pci, struct pci_setup_rom **__rom) 31c2d0b470SArd Biesheuvel { 32c2d0b470SArd Biesheuvel struct pci_setup_rom *rom = NULL; 33c2d0b470SArd Biesheuvel efi_status_t status; 34c2d0b470SArd Biesheuvel unsigned long size; 35c2d0b470SArd Biesheuvel uint64_t romsize; 36c2d0b470SArd Biesheuvel void *romimage; 37c2d0b470SArd Biesheuvel 38c2d0b470SArd Biesheuvel /* 39c2d0b470SArd Biesheuvel * Some firmware images contain EFI function pointers at the place where 40c2d0b470SArd Biesheuvel * the romimage and romsize fields are supposed to be. Typically the EFI 41c2d0b470SArd Biesheuvel * code is mapped at high addresses, translating to an unrealistically 42c2d0b470SArd Biesheuvel * large romsize. The UEFI spec limits the size of option ROMs to 16 43c2d0b470SArd Biesheuvel * MiB so we reject any ROMs over 16 MiB in size to catch this. 44c2d0b470SArd Biesheuvel */ 45c2d0b470SArd Biesheuvel romimage = efi_table_attr(pci, romimage); 46c2d0b470SArd Biesheuvel romsize = efi_table_attr(pci, romsize); 47c2d0b470SArd Biesheuvel if (!romimage || !romsize || romsize > SZ_16M) 48c2d0b470SArd Biesheuvel return EFI_INVALID_PARAMETER; 49c2d0b470SArd Biesheuvel 50c2d0b470SArd Biesheuvel size = romsize + sizeof(*rom); 51c2d0b470SArd Biesheuvel 52c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 53c2d0b470SArd Biesheuvel (void **)&rom); 54c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 5536bdd0a7SArvind Sankar efi_err("Failed to allocate memory for 'rom'\n"); 56c2d0b470SArd Biesheuvel return status; 57c2d0b470SArd Biesheuvel } 58c2d0b470SArd Biesheuvel 59c2d0b470SArd Biesheuvel memset(rom, 0, sizeof(*rom)); 60c2d0b470SArd Biesheuvel 61c2d0b470SArd Biesheuvel rom->data.type = SETUP_PCI; 62c2d0b470SArd Biesheuvel rom->data.len = size - sizeof(struct setup_data); 63c2d0b470SArd Biesheuvel rom->data.next = 0; 64c2d0b470SArd Biesheuvel rom->pcilen = pci->romsize; 65c2d0b470SArd Biesheuvel *__rom = rom; 66c2d0b470SArd Biesheuvel 67c2d0b470SArd Biesheuvel status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16, 68c2d0b470SArd Biesheuvel PCI_VENDOR_ID, 1, &rom->vendor); 69c2d0b470SArd Biesheuvel 70c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 7136bdd0a7SArvind Sankar efi_err("Failed to read rom->vendor\n"); 72c2d0b470SArd Biesheuvel goto free_struct; 73c2d0b470SArd Biesheuvel } 74c2d0b470SArd Biesheuvel 75c2d0b470SArd Biesheuvel status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16, 76c2d0b470SArd Biesheuvel PCI_DEVICE_ID, 1, &rom->devid); 77c2d0b470SArd Biesheuvel 78c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 7936bdd0a7SArvind Sankar efi_err("Failed to read rom->devid\n"); 80c2d0b470SArd Biesheuvel goto free_struct; 81c2d0b470SArd Biesheuvel } 82c2d0b470SArd Biesheuvel 83c2d0b470SArd Biesheuvel status = efi_call_proto(pci, get_location, &rom->segment, &rom->bus, 84c2d0b470SArd Biesheuvel &rom->device, &rom->function); 85c2d0b470SArd Biesheuvel 86c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 87c2d0b470SArd Biesheuvel goto free_struct; 88c2d0b470SArd Biesheuvel 89c2d0b470SArd Biesheuvel memcpy(rom->romdata, romimage, romsize); 90c2d0b470SArd Biesheuvel return status; 91c2d0b470SArd Biesheuvel 92c2d0b470SArd Biesheuvel free_struct: 93c2d0b470SArd Biesheuvel efi_bs_call(free_pool, rom); 94c2d0b470SArd Biesheuvel return status; 95c2d0b470SArd Biesheuvel } 96c2d0b470SArd Biesheuvel 97c2d0b470SArd Biesheuvel /* 98c2d0b470SArd Biesheuvel * There's no way to return an informative status from this function, 99c2d0b470SArd Biesheuvel * because any analysis (and printing of error messages) needs to be 100c2d0b470SArd Biesheuvel * done directly at the EFI function call-site. 101c2d0b470SArd Biesheuvel * 102c2d0b470SArd Biesheuvel * For example, EFI_INVALID_PARAMETER could indicate a bug or maybe we 103c2d0b470SArd Biesheuvel * just didn't find any PCI devices, but there's no way to tell outside 104c2d0b470SArd Biesheuvel * the context of the call. 105c2d0b470SArd Biesheuvel */ 106c2d0b470SArd Biesheuvel static void setup_efi_pci(struct boot_params *params) 107c2d0b470SArd Biesheuvel { 108c2d0b470SArd Biesheuvel efi_status_t status; 109c2d0b470SArd Biesheuvel void **pci_handle = NULL; 110c2d0b470SArd Biesheuvel efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID; 111c2d0b470SArd Biesheuvel unsigned long size = 0; 112c2d0b470SArd Biesheuvel struct setup_data *data; 113c2d0b470SArd Biesheuvel efi_handle_t h; 114c2d0b470SArd Biesheuvel int i; 115c2d0b470SArd Biesheuvel 116c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 117c2d0b470SArd Biesheuvel &pci_proto, NULL, &size, pci_handle); 118c2d0b470SArd Biesheuvel 119c2d0b470SArd Biesheuvel if (status == EFI_BUFFER_TOO_SMALL) { 120c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 121c2d0b470SArd Biesheuvel (void **)&pci_handle); 122c2d0b470SArd Biesheuvel 123c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 12436bdd0a7SArvind Sankar efi_err("Failed to allocate memory for 'pci_handle'\n"); 125c2d0b470SArd Biesheuvel return; 126c2d0b470SArd Biesheuvel } 127c2d0b470SArd Biesheuvel 128c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 129c2d0b470SArd Biesheuvel &pci_proto, NULL, &size, pci_handle); 130c2d0b470SArd Biesheuvel } 131c2d0b470SArd Biesheuvel 132c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 133c2d0b470SArd Biesheuvel goto free_handle; 134c2d0b470SArd Biesheuvel 135c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)params->hdr.setup_data; 136c2d0b470SArd Biesheuvel 137c2d0b470SArd Biesheuvel while (data && data->next) 138c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)data->next; 139c2d0b470SArd Biesheuvel 140c2d0b470SArd Biesheuvel for_each_efi_handle(h, pci_handle, size, i) { 141c2d0b470SArd Biesheuvel efi_pci_io_protocol_t *pci = NULL; 142c2d0b470SArd Biesheuvel struct pci_setup_rom *rom; 143c2d0b470SArd Biesheuvel 144c2d0b470SArd Biesheuvel status = efi_bs_call(handle_protocol, h, &pci_proto, 145c2d0b470SArd Biesheuvel (void **)&pci); 146c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS || !pci) 147c2d0b470SArd Biesheuvel continue; 148c2d0b470SArd Biesheuvel 149c2d0b470SArd Biesheuvel status = preserve_pci_rom_image(pci, &rom); 150c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 151c2d0b470SArd Biesheuvel continue; 152c2d0b470SArd Biesheuvel 153c2d0b470SArd Biesheuvel if (data) 154c2d0b470SArd Biesheuvel data->next = (unsigned long)rom; 155c2d0b470SArd Biesheuvel else 156c2d0b470SArd Biesheuvel params->hdr.setup_data = (unsigned long)rom; 157c2d0b470SArd Biesheuvel 158c2d0b470SArd Biesheuvel data = (struct setup_data *)rom; 159c2d0b470SArd Biesheuvel } 160c2d0b470SArd Biesheuvel 161c2d0b470SArd Biesheuvel free_handle: 162c2d0b470SArd Biesheuvel efi_bs_call(free_pool, pci_handle); 163c2d0b470SArd Biesheuvel } 164c2d0b470SArd Biesheuvel 165c2d0b470SArd Biesheuvel static void retrieve_apple_device_properties(struct boot_params *boot_params) 166c2d0b470SArd Biesheuvel { 167c2d0b470SArd Biesheuvel efi_guid_t guid = APPLE_PROPERTIES_PROTOCOL_GUID; 168c2d0b470SArd Biesheuvel struct setup_data *data, *new; 169c2d0b470SArd Biesheuvel efi_status_t status; 170c2d0b470SArd Biesheuvel u32 size = 0; 171c2d0b470SArd Biesheuvel apple_properties_protocol_t *p; 172c2d0b470SArd Biesheuvel 173c2d0b470SArd Biesheuvel status = efi_bs_call(locate_protocol, &guid, NULL, (void **)&p); 174c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 175c2d0b470SArd Biesheuvel return; 176c2d0b470SArd Biesheuvel 177c2d0b470SArd Biesheuvel if (efi_table_attr(p, version) != 0x10000) { 17836bdd0a7SArvind Sankar efi_err("Unsupported properties proto version\n"); 179c2d0b470SArd Biesheuvel return; 180c2d0b470SArd Biesheuvel } 181c2d0b470SArd Biesheuvel 182c2d0b470SArd Biesheuvel efi_call_proto(p, get_all, NULL, &size); 183c2d0b470SArd Biesheuvel if (!size) 184c2d0b470SArd Biesheuvel return; 185c2d0b470SArd Biesheuvel 186c2d0b470SArd Biesheuvel do { 187c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, 188c2d0b470SArd Biesheuvel size + sizeof(struct setup_data), 189c2d0b470SArd Biesheuvel (void **)&new); 190c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 19136bdd0a7SArvind Sankar efi_err("Failed to allocate memory for 'properties'\n"); 192c2d0b470SArd Biesheuvel return; 193c2d0b470SArd Biesheuvel } 194c2d0b470SArd Biesheuvel 195c2d0b470SArd Biesheuvel status = efi_call_proto(p, get_all, new->data, &size); 196c2d0b470SArd Biesheuvel 197c2d0b470SArd Biesheuvel if (status == EFI_BUFFER_TOO_SMALL) 198c2d0b470SArd Biesheuvel efi_bs_call(free_pool, new); 199c2d0b470SArd Biesheuvel } while (status == EFI_BUFFER_TOO_SMALL); 200c2d0b470SArd Biesheuvel 201c2d0b470SArd Biesheuvel new->type = SETUP_APPLE_PROPERTIES; 202c2d0b470SArd Biesheuvel new->len = size; 203c2d0b470SArd Biesheuvel new->next = 0; 204c2d0b470SArd Biesheuvel 205c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)boot_params->hdr.setup_data; 206c2d0b470SArd Biesheuvel if (!data) { 207c2d0b470SArd Biesheuvel boot_params->hdr.setup_data = (unsigned long)new; 208c2d0b470SArd Biesheuvel } else { 209c2d0b470SArd Biesheuvel while (data->next) 210c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)data->next; 211c2d0b470SArd Biesheuvel data->next = (unsigned long)new; 212c2d0b470SArd Biesheuvel } 213c2d0b470SArd Biesheuvel } 214c2d0b470SArd Biesheuvel 215c2d0b470SArd Biesheuvel static const efi_char16_t apple[] = L"Apple"; 216c2d0b470SArd Biesheuvel 217c2d0b470SArd Biesheuvel static void setup_quirks(struct boot_params *boot_params) 218c2d0b470SArd Biesheuvel { 219c2d0b470SArd Biesheuvel efi_char16_t *fw_vendor = (efi_char16_t *)(unsigned long) 220ccc27ae7SArd Biesheuvel efi_table_attr(efi_system_table, fw_vendor); 221c2d0b470SArd Biesheuvel 222c2d0b470SArd Biesheuvel if (!memcmp(fw_vendor, apple, sizeof(apple))) { 223c2d0b470SArd Biesheuvel if (IS_ENABLED(CONFIG_APPLE_PROPERTIES)) 224c2d0b470SArd Biesheuvel retrieve_apple_device_properties(boot_params); 225c2d0b470SArd Biesheuvel } 226c2d0b470SArd Biesheuvel } 227c2d0b470SArd Biesheuvel 228c2d0b470SArd Biesheuvel /* 229c2d0b470SArd Biesheuvel * See if we have Universal Graphics Adapter (UGA) protocol 230c2d0b470SArd Biesheuvel */ 231c2d0b470SArd Biesheuvel static efi_status_t 232c2d0b470SArd Biesheuvel setup_uga(struct screen_info *si, efi_guid_t *uga_proto, unsigned long size) 233c2d0b470SArd Biesheuvel { 234c2d0b470SArd Biesheuvel efi_status_t status; 235c2d0b470SArd Biesheuvel u32 width, height; 236c2d0b470SArd Biesheuvel void **uga_handle = NULL; 237c2d0b470SArd Biesheuvel efi_uga_draw_protocol_t *uga = NULL, *first_uga; 238c2d0b470SArd Biesheuvel efi_handle_t handle; 239c2d0b470SArd Biesheuvel int i; 240c2d0b470SArd Biesheuvel 241c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 242c2d0b470SArd Biesheuvel (void **)&uga_handle); 243c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 244c2d0b470SArd Biesheuvel return status; 245c2d0b470SArd Biesheuvel 246c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 247c2d0b470SArd Biesheuvel uga_proto, NULL, &size, uga_handle); 248c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 249c2d0b470SArd Biesheuvel goto free_handle; 250c2d0b470SArd Biesheuvel 251c2d0b470SArd Biesheuvel height = 0; 252c2d0b470SArd Biesheuvel width = 0; 253c2d0b470SArd Biesheuvel 254c2d0b470SArd Biesheuvel first_uga = NULL; 255c2d0b470SArd Biesheuvel for_each_efi_handle(handle, uga_handle, size, i) { 256c2d0b470SArd Biesheuvel efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID; 257c2d0b470SArd Biesheuvel u32 w, h, depth, refresh; 258c2d0b470SArd Biesheuvel void *pciio; 259c2d0b470SArd Biesheuvel 260c2d0b470SArd Biesheuvel status = efi_bs_call(handle_protocol, handle, uga_proto, 261c2d0b470SArd Biesheuvel (void **)&uga); 262c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 263c2d0b470SArd Biesheuvel continue; 264c2d0b470SArd Biesheuvel 265c2d0b470SArd Biesheuvel pciio = NULL; 266c2d0b470SArd Biesheuvel efi_bs_call(handle_protocol, handle, &pciio_proto, &pciio); 267c2d0b470SArd Biesheuvel 268c2d0b470SArd Biesheuvel status = efi_call_proto(uga, get_mode, &w, &h, &depth, &refresh); 269c2d0b470SArd Biesheuvel if (status == EFI_SUCCESS && (!first_uga || pciio)) { 270c2d0b470SArd Biesheuvel width = w; 271c2d0b470SArd Biesheuvel height = h; 272c2d0b470SArd Biesheuvel 273c2d0b470SArd Biesheuvel /* 274c2d0b470SArd Biesheuvel * Once we've found a UGA supporting PCIIO, 275c2d0b470SArd Biesheuvel * don't bother looking any further. 276c2d0b470SArd Biesheuvel */ 277c2d0b470SArd Biesheuvel if (pciio) 278c2d0b470SArd Biesheuvel break; 279c2d0b470SArd Biesheuvel 280c2d0b470SArd Biesheuvel first_uga = uga; 281c2d0b470SArd Biesheuvel } 282c2d0b470SArd Biesheuvel } 283c2d0b470SArd Biesheuvel 284c2d0b470SArd Biesheuvel if (!width && !height) 285c2d0b470SArd Biesheuvel goto free_handle; 286c2d0b470SArd Biesheuvel 287c2d0b470SArd Biesheuvel /* EFI framebuffer */ 288c2d0b470SArd Biesheuvel si->orig_video_isVGA = VIDEO_TYPE_EFI; 289c2d0b470SArd Biesheuvel 290c2d0b470SArd Biesheuvel si->lfb_depth = 32; 291c2d0b470SArd Biesheuvel si->lfb_width = width; 292c2d0b470SArd Biesheuvel si->lfb_height = height; 293c2d0b470SArd Biesheuvel 294c2d0b470SArd Biesheuvel si->red_size = 8; 295c2d0b470SArd Biesheuvel si->red_pos = 16; 296c2d0b470SArd Biesheuvel si->green_size = 8; 297c2d0b470SArd Biesheuvel si->green_pos = 8; 298c2d0b470SArd Biesheuvel si->blue_size = 8; 299c2d0b470SArd Biesheuvel si->blue_pos = 0; 300c2d0b470SArd Biesheuvel si->rsvd_size = 8; 301c2d0b470SArd Biesheuvel si->rsvd_pos = 24; 302c2d0b470SArd Biesheuvel 303c2d0b470SArd Biesheuvel free_handle: 304c2d0b470SArd Biesheuvel efi_bs_call(free_pool, uga_handle); 305c2d0b470SArd Biesheuvel 306c2d0b470SArd Biesheuvel return status; 307c2d0b470SArd Biesheuvel } 308c2d0b470SArd Biesheuvel 309c2d0b470SArd Biesheuvel static void setup_graphics(struct boot_params *boot_params) 310c2d0b470SArd Biesheuvel { 311c2d0b470SArd Biesheuvel efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID; 312c2d0b470SArd Biesheuvel struct screen_info *si; 313c2d0b470SArd Biesheuvel efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID; 314c2d0b470SArd Biesheuvel efi_status_t status; 315c2d0b470SArd Biesheuvel unsigned long size; 316c2d0b470SArd Biesheuvel void **gop_handle = NULL; 317c2d0b470SArd Biesheuvel void **uga_handle = NULL; 318c2d0b470SArd Biesheuvel 319c2d0b470SArd Biesheuvel si = &boot_params->screen_info; 320c2d0b470SArd Biesheuvel memset(si, 0, sizeof(*si)); 321c2d0b470SArd Biesheuvel 322c2d0b470SArd Biesheuvel size = 0; 323c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 324c2d0b470SArd Biesheuvel &graphics_proto, NULL, &size, gop_handle); 325c2d0b470SArd Biesheuvel if (status == EFI_BUFFER_TOO_SMALL) 326c2d0b470SArd Biesheuvel status = efi_setup_gop(si, &graphics_proto, size); 327c2d0b470SArd Biesheuvel 328c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 329c2d0b470SArd Biesheuvel size = 0; 330c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 331c2d0b470SArd Biesheuvel &uga_proto, NULL, &size, uga_handle); 332c2d0b470SArd Biesheuvel if (status == EFI_BUFFER_TOO_SMALL) 333c2d0b470SArd Biesheuvel setup_uga(si, &uga_proto, size); 334c2d0b470SArd Biesheuvel } 335c2d0b470SArd Biesheuvel } 336c2d0b470SArd Biesheuvel 3373b8f44fcSArd Biesheuvel 3383b8f44fcSArd Biesheuvel static void __noreturn efi_exit(efi_handle_t handle, efi_status_t status) 3393b8f44fcSArd Biesheuvel { 3403b8f44fcSArd Biesheuvel efi_bs_call(exit, handle, status, 0, NULL); 341f3fa0efcSArd Biesheuvel for(;;) 342f3fa0efcSArd Biesheuvel asm("hlt"); 3433b8f44fcSArd Biesheuvel } 3443b8f44fcSArd Biesheuvel 345c2d0b470SArd Biesheuvel void startup_32(struct boot_params *boot_params); 346c2d0b470SArd Biesheuvel 347c2d0b470SArd Biesheuvel void __noreturn efi_stub_entry(efi_handle_t handle, 348c2d0b470SArd Biesheuvel efi_system_table_t *sys_table_arg, 349c2d0b470SArd Biesheuvel struct boot_params *boot_params); 350c2d0b470SArd Biesheuvel 351c2d0b470SArd Biesheuvel /* 352c2d0b470SArd Biesheuvel * Because the x86 boot code expects to be passed a boot_params we 353c2d0b470SArd Biesheuvel * need to create one ourselves (usually the bootloader would create 354c2d0b470SArd Biesheuvel * one for us). 355c2d0b470SArd Biesheuvel */ 356c2d0b470SArd Biesheuvel efi_status_t __efiapi efi_pe_entry(efi_handle_t handle, 357c2d0b470SArd Biesheuvel efi_system_table_t *sys_table_arg) 358c2d0b470SArd Biesheuvel { 359c2d0b470SArd Biesheuvel struct boot_params *boot_params; 360c2d0b470SArd Biesheuvel struct setup_header *hdr; 3611887c9b6SArvind Sankar void *image_base; 362c2d0b470SArd Biesheuvel efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID; 363c2d0b470SArd Biesheuvel int options_size = 0; 364c2d0b470SArd Biesheuvel efi_status_t status; 365c2d0b470SArd Biesheuvel char *cmdline_ptr; 366c2d0b470SArd Biesheuvel 367ccc27ae7SArd Biesheuvel efi_system_table = sys_table_arg; 368c2d0b470SArd Biesheuvel 369c2d0b470SArd Biesheuvel /* Check if we were booted by the EFI firmware */ 370ccc27ae7SArd Biesheuvel if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) 3713b8f44fcSArd Biesheuvel efi_exit(handle, EFI_INVALID_PARAMETER); 372c2d0b470SArd Biesheuvel 3730347d8c2SArvind Sankar status = efi_bs_call(handle_protocol, handle, &proto, (void **)&image); 374c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 37536bdd0a7SArvind Sankar efi_err("Failed to get handle for LOADED_IMAGE_PROTOCOL\n"); 3763b8f44fcSArd Biesheuvel efi_exit(handle, status); 377c2d0b470SArd Biesheuvel } 378c2d0b470SArd Biesheuvel 3791887c9b6SArvind Sankar image_base = efi_table_attr(image, image_base); 3801887c9b6SArvind Sankar image_offset = (void *)startup_32 - image_base; 3811887c9b6SArvind Sankar 382019512f1SArvind Sankar status = efi_allocate_pages(sizeof(struct boot_params), 383019512f1SArvind Sankar (unsigned long *)&boot_params, ULONG_MAX); 384c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 38536bdd0a7SArvind Sankar efi_err("Failed to allocate lowmem for boot params\n"); 3863b8f44fcSArd Biesheuvel efi_exit(handle, status); 387c2d0b470SArd Biesheuvel } 388c2d0b470SArd Biesheuvel 389019512f1SArvind Sankar memset(boot_params, 0x0, sizeof(struct boot_params)); 390c2d0b470SArd Biesheuvel 391c2d0b470SArd Biesheuvel hdr = &boot_params->hdr; 392c2d0b470SArd Biesheuvel 39359476f80SArvind Sankar /* Copy the setup header from the second sector to boot_params */ 39459476f80SArvind Sankar memcpy(&hdr->jump, image_base + 512, 39559476f80SArvind Sankar sizeof(struct setup_header) - offsetof(struct setup_header, jump)); 396c2d0b470SArd Biesheuvel 397c2d0b470SArd Biesheuvel /* 398c2d0b470SArd Biesheuvel * Fill out some of the header fields ourselves because the 399c2d0b470SArd Biesheuvel * EFI firmware loader doesn't load the first sector. 400c2d0b470SArd Biesheuvel */ 401c2d0b470SArd Biesheuvel hdr->root_flags = 1; 402c2d0b470SArd Biesheuvel hdr->vid_mode = 0xffff; 403c2d0b470SArd Biesheuvel hdr->boot_flag = 0xAA55; 404c2d0b470SArd Biesheuvel 405c2d0b470SArd Biesheuvel hdr->type_of_loader = 0x21; 406c2d0b470SArd Biesheuvel 407c2d0b470SArd Biesheuvel /* Convert unicode cmdline to ascii */ 40827cd5511SArd Biesheuvel cmdline_ptr = efi_convert_cmdline(image, &options_size); 409c2d0b470SArd Biesheuvel if (!cmdline_ptr) 410c2d0b470SArd Biesheuvel goto fail; 411c2d0b470SArd Biesheuvel 412eed4e019SArvind Sankar efi_set_u64_split((unsigned long)cmdline_ptr, 413eed4e019SArvind Sankar &hdr->cmd_line_ptr, &boot_params->ext_cmd_line_ptr); 414c2d0b470SArd Biesheuvel 415c2d0b470SArd Biesheuvel hdr->ramdisk_image = 0; 416c2d0b470SArd Biesheuvel hdr->ramdisk_size = 0; 417c2d0b470SArd Biesheuvel 418ccc27ae7SArd Biesheuvel efi_stub_entry(handle, sys_table_arg, boot_params); 419c2d0b470SArd Biesheuvel /* not reached */ 420c2d0b470SArd Biesheuvel 421c2d0b470SArd Biesheuvel fail: 422019512f1SArvind Sankar efi_free(sizeof(struct boot_params), (unsigned long)boot_params); 423c2d0b470SArd Biesheuvel 4243b8f44fcSArd Biesheuvel efi_exit(handle, status); 425c2d0b470SArd Biesheuvel } 426c2d0b470SArd Biesheuvel 427c2d0b470SArd Biesheuvel static void add_e820ext(struct boot_params *params, 428c2d0b470SArd Biesheuvel struct setup_data *e820ext, u32 nr_entries) 429c2d0b470SArd Biesheuvel { 430c2d0b470SArd Biesheuvel struct setup_data *data; 431c2d0b470SArd Biesheuvel 432c2d0b470SArd Biesheuvel e820ext->type = SETUP_E820_EXT; 433c2d0b470SArd Biesheuvel e820ext->len = nr_entries * sizeof(struct boot_e820_entry); 434c2d0b470SArd Biesheuvel e820ext->next = 0; 435c2d0b470SArd Biesheuvel 436c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)params->hdr.setup_data; 437c2d0b470SArd Biesheuvel 438c2d0b470SArd Biesheuvel while (data && data->next) 439c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)data->next; 440c2d0b470SArd Biesheuvel 441c2d0b470SArd Biesheuvel if (data) 442c2d0b470SArd Biesheuvel data->next = (unsigned long)e820ext; 443c2d0b470SArd Biesheuvel else 444c2d0b470SArd Biesheuvel params->hdr.setup_data = (unsigned long)e820ext; 445c2d0b470SArd Biesheuvel } 446c2d0b470SArd Biesheuvel 447c2d0b470SArd Biesheuvel static efi_status_t 448c2d0b470SArd Biesheuvel setup_e820(struct boot_params *params, struct setup_data *e820ext, u32 e820ext_size) 449c2d0b470SArd Biesheuvel { 450c2d0b470SArd Biesheuvel struct boot_e820_entry *entry = params->e820_table; 451c2d0b470SArd Biesheuvel struct efi_info *efi = ¶ms->efi_info; 452c2d0b470SArd Biesheuvel struct boot_e820_entry *prev = NULL; 453c2d0b470SArd Biesheuvel u32 nr_entries; 454c2d0b470SArd Biesheuvel u32 nr_desc; 455c2d0b470SArd Biesheuvel int i; 456c2d0b470SArd Biesheuvel 457c2d0b470SArd Biesheuvel nr_entries = 0; 458c2d0b470SArd Biesheuvel nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size; 459c2d0b470SArd Biesheuvel 460c2d0b470SArd Biesheuvel for (i = 0; i < nr_desc; i++) { 461c2d0b470SArd Biesheuvel efi_memory_desc_t *d; 462c2d0b470SArd Biesheuvel unsigned int e820_type = 0; 463c2d0b470SArd Biesheuvel unsigned long m = efi->efi_memmap; 464c2d0b470SArd Biesheuvel 465c2d0b470SArd Biesheuvel #ifdef CONFIG_X86_64 466c2d0b470SArd Biesheuvel m |= (u64)efi->efi_memmap_hi << 32; 467c2d0b470SArd Biesheuvel #endif 468c2d0b470SArd Biesheuvel 469c2d0b470SArd Biesheuvel d = efi_early_memdesc_ptr(m, efi->efi_memdesc_size, i); 470c2d0b470SArd Biesheuvel switch (d->type) { 471c2d0b470SArd Biesheuvel case EFI_RESERVED_TYPE: 472c2d0b470SArd Biesheuvel case EFI_RUNTIME_SERVICES_CODE: 473c2d0b470SArd Biesheuvel case EFI_RUNTIME_SERVICES_DATA: 474c2d0b470SArd Biesheuvel case EFI_MEMORY_MAPPED_IO: 475c2d0b470SArd Biesheuvel case EFI_MEMORY_MAPPED_IO_PORT_SPACE: 476c2d0b470SArd Biesheuvel case EFI_PAL_CODE: 477c2d0b470SArd Biesheuvel e820_type = E820_TYPE_RESERVED; 478c2d0b470SArd Biesheuvel break; 479c2d0b470SArd Biesheuvel 480c2d0b470SArd Biesheuvel case EFI_UNUSABLE_MEMORY: 481c2d0b470SArd Biesheuvel e820_type = E820_TYPE_UNUSABLE; 482c2d0b470SArd Biesheuvel break; 483c2d0b470SArd Biesheuvel 484c2d0b470SArd Biesheuvel case EFI_ACPI_RECLAIM_MEMORY: 485c2d0b470SArd Biesheuvel e820_type = E820_TYPE_ACPI; 486c2d0b470SArd Biesheuvel break; 487c2d0b470SArd Biesheuvel 488c2d0b470SArd Biesheuvel case EFI_LOADER_CODE: 489c2d0b470SArd Biesheuvel case EFI_LOADER_DATA: 490c2d0b470SArd Biesheuvel case EFI_BOOT_SERVICES_CODE: 491c2d0b470SArd Biesheuvel case EFI_BOOT_SERVICES_DATA: 492c2d0b470SArd Biesheuvel case EFI_CONVENTIONAL_MEMORY: 493c2d0b470SArd Biesheuvel if (efi_soft_reserve_enabled() && 494c2d0b470SArd Biesheuvel (d->attribute & EFI_MEMORY_SP)) 495c2d0b470SArd Biesheuvel e820_type = E820_TYPE_SOFT_RESERVED; 496c2d0b470SArd Biesheuvel else 497c2d0b470SArd Biesheuvel e820_type = E820_TYPE_RAM; 498c2d0b470SArd Biesheuvel break; 499c2d0b470SArd Biesheuvel 500c2d0b470SArd Biesheuvel case EFI_ACPI_MEMORY_NVS: 501c2d0b470SArd Biesheuvel e820_type = E820_TYPE_NVS; 502c2d0b470SArd Biesheuvel break; 503c2d0b470SArd Biesheuvel 504c2d0b470SArd Biesheuvel case EFI_PERSISTENT_MEMORY: 505c2d0b470SArd Biesheuvel e820_type = E820_TYPE_PMEM; 506c2d0b470SArd Biesheuvel break; 507c2d0b470SArd Biesheuvel 508c2d0b470SArd Biesheuvel default: 509c2d0b470SArd Biesheuvel continue; 510c2d0b470SArd Biesheuvel } 511c2d0b470SArd Biesheuvel 512c2d0b470SArd Biesheuvel /* Merge adjacent mappings */ 513c2d0b470SArd Biesheuvel if (prev && prev->type == e820_type && 514c2d0b470SArd Biesheuvel (prev->addr + prev->size) == d->phys_addr) { 515c2d0b470SArd Biesheuvel prev->size += d->num_pages << 12; 516c2d0b470SArd Biesheuvel continue; 517c2d0b470SArd Biesheuvel } 518c2d0b470SArd Biesheuvel 519c2d0b470SArd Biesheuvel if (nr_entries == ARRAY_SIZE(params->e820_table)) { 520c2d0b470SArd Biesheuvel u32 need = (nr_desc - i) * sizeof(struct e820_entry) + 521c2d0b470SArd Biesheuvel sizeof(struct setup_data); 522c2d0b470SArd Biesheuvel 523c2d0b470SArd Biesheuvel if (!e820ext || e820ext_size < need) 524c2d0b470SArd Biesheuvel return EFI_BUFFER_TOO_SMALL; 525c2d0b470SArd Biesheuvel 526c2d0b470SArd Biesheuvel /* boot_params map full, switch to e820 extended */ 527c2d0b470SArd Biesheuvel entry = (struct boot_e820_entry *)e820ext->data; 528c2d0b470SArd Biesheuvel } 529c2d0b470SArd Biesheuvel 530c2d0b470SArd Biesheuvel entry->addr = d->phys_addr; 531c2d0b470SArd Biesheuvel entry->size = d->num_pages << PAGE_SHIFT; 532c2d0b470SArd Biesheuvel entry->type = e820_type; 533c2d0b470SArd Biesheuvel prev = entry++; 534c2d0b470SArd Biesheuvel nr_entries++; 535c2d0b470SArd Biesheuvel } 536c2d0b470SArd Biesheuvel 537c2d0b470SArd Biesheuvel if (nr_entries > ARRAY_SIZE(params->e820_table)) { 538c2d0b470SArd Biesheuvel u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_table); 539c2d0b470SArd Biesheuvel 540c2d0b470SArd Biesheuvel add_e820ext(params, e820ext, nr_e820ext); 541c2d0b470SArd Biesheuvel nr_entries -= nr_e820ext; 542c2d0b470SArd Biesheuvel } 543c2d0b470SArd Biesheuvel 544c2d0b470SArd Biesheuvel params->e820_entries = (u8)nr_entries; 545c2d0b470SArd Biesheuvel 546c2d0b470SArd Biesheuvel return EFI_SUCCESS; 547c2d0b470SArd Biesheuvel } 548c2d0b470SArd Biesheuvel 549c2d0b470SArd Biesheuvel static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext, 550c2d0b470SArd Biesheuvel u32 *e820ext_size) 551c2d0b470SArd Biesheuvel { 552c2d0b470SArd Biesheuvel efi_status_t status; 553c2d0b470SArd Biesheuvel unsigned long size; 554c2d0b470SArd Biesheuvel 555c2d0b470SArd Biesheuvel size = sizeof(struct setup_data) + 556c2d0b470SArd Biesheuvel sizeof(struct e820_entry) * nr_desc; 557c2d0b470SArd Biesheuvel 558c2d0b470SArd Biesheuvel if (*e820ext) { 559c2d0b470SArd Biesheuvel efi_bs_call(free_pool, *e820ext); 560c2d0b470SArd Biesheuvel *e820ext = NULL; 561c2d0b470SArd Biesheuvel *e820ext_size = 0; 562c2d0b470SArd Biesheuvel } 563c2d0b470SArd Biesheuvel 564c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 565c2d0b470SArd Biesheuvel (void **)e820ext); 566c2d0b470SArd Biesheuvel if (status == EFI_SUCCESS) 567c2d0b470SArd Biesheuvel *e820ext_size = size; 568c2d0b470SArd Biesheuvel 569c2d0b470SArd Biesheuvel return status; 570c2d0b470SArd Biesheuvel } 571c2d0b470SArd Biesheuvel 572c2d0b470SArd Biesheuvel static efi_status_t allocate_e820(struct boot_params *params, 573c2d0b470SArd Biesheuvel struct setup_data **e820ext, 574c2d0b470SArd Biesheuvel u32 *e820ext_size) 575c2d0b470SArd Biesheuvel { 576fd626195SLenny Szubowicz unsigned long map_size, desc_size, map_key; 577c2d0b470SArd Biesheuvel efi_status_t status; 578fd626195SLenny Szubowicz __u32 nr_desc, desc_version; 579c2d0b470SArd Biesheuvel 580fd626195SLenny Szubowicz /* Only need the size of the mem map and size of each mem descriptor */ 581fd626195SLenny Szubowicz map_size = 0; 582fd626195SLenny Szubowicz status = efi_bs_call(get_memory_map, &map_size, NULL, &map_key, 583fd626195SLenny Szubowicz &desc_size, &desc_version); 584fd626195SLenny Szubowicz if (status != EFI_BUFFER_TOO_SMALL) 585fd626195SLenny Szubowicz return (status != EFI_SUCCESS) ? status : EFI_UNSUPPORTED; 586c2d0b470SArd Biesheuvel 587fd626195SLenny Szubowicz nr_desc = map_size / desc_size + EFI_MMAP_NR_SLACK_SLOTS; 588c2d0b470SArd Biesheuvel 589c2d0b470SArd Biesheuvel if (nr_desc > ARRAY_SIZE(params->e820_table)) { 590c2d0b470SArd Biesheuvel u32 nr_e820ext = nr_desc - ARRAY_SIZE(params->e820_table); 591c2d0b470SArd Biesheuvel 592c2d0b470SArd Biesheuvel status = alloc_e820ext(nr_e820ext, e820ext, e820ext_size); 593c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 594c2d0b470SArd Biesheuvel return status; 595c2d0b470SArd Biesheuvel } 596c2d0b470SArd Biesheuvel 597c2d0b470SArd Biesheuvel return EFI_SUCCESS; 598c2d0b470SArd Biesheuvel } 599c2d0b470SArd Biesheuvel 600c2d0b470SArd Biesheuvel struct exit_boot_struct { 601c2d0b470SArd Biesheuvel struct boot_params *boot_params; 602c2d0b470SArd Biesheuvel struct efi_info *efi; 603c2d0b470SArd Biesheuvel }; 604c2d0b470SArd Biesheuvel 605c2d0b470SArd Biesheuvel static efi_status_t exit_boot_func(struct efi_boot_memmap *map, 606c2d0b470SArd Biesheuvel void *priv) 607c2d0b470SArd Biesheuvel { 608c2d0b470SArd Biesheuvel const char *signature; 609c2d0b470SArd Biesheuvel struct exit_boot_struct *p = priv; 610c2d0b470SArd Biesheuvel 611c2d0b470SArd Biesheuvel signature = efi_is_64bit() ? EFI64_LOADER_SIGNATURE 612c2d0b470SArd Biesheuvel : EFI32_LOADER_SIGNATURE; 613c2d0b470SArd Biesheuvel memcpy(&p->efi->efi_loader_signature, signature, sizeof(__u32)); 614c2d0b470SArd Biesheuvel 615eed4e019SArvind Sankar efi_set_u64_split((unsigned long)efi_system_table, 616eed4e019SArvind Sankar &p->efi->efi_systab, &p->efi->efi_systab_hi); 617c2d0b470SArd Biesheuvel p->efi->efi_memdesc_size = *map->desc_size; 618c2d0b470SArd Biesheuvel p->efi->efi_memdesc_version = *map->desc_ver; 619eed4e019SArvind Sankar efi_set_u64_split((unsigned long)*map->map, 620eed4e019SArvind Sankar &p->efi->efi_memmap, &p->efi->efi_memmap_hi); 621c2d0b470SArd Biesheuvel p->efi->efi_memmap_size = *map->map_size; 622c2d0b470SArd Biesheuvel 623c2d0b470SArd Biesheuvel return EFI_SUCCESS; 624c2d0b470SArd Biesheuvel } 625c2d0b470SArd Biesheuvel 626c2d0b470SArd Biesheuvel static efi_status_t exit_boot(struct boot_params *boot_params, void *handle) 627c2d0b470SArd Biesheuvel { 628c2d0b470SArd Biesheuvel unsigned long map_sz, key, desc_size, buff_size; 629c2d0b470SArd Biesheuvel efi_memory_desc_t *mem_map; 630c2d0b470SArd Biesheuvel struct setup_data *e820ext = NULL; 631c2d0b470SArd Biesheuvel __u32 e820ext_size = 0; 632c2d0b470SArd Biesheuvel efi_status_t status; 633c2d0b470SArd Biesheuvel __u32 desc_version; 634c2d0b470SArd Biesheuvel struct efi_boot_memmap map; 635c2d0b470SArd Biesheuvel struct exit_boot_struct priv; 636c2d0b470SArd Biesheuvel 637c2d0b470SArd Biesheuvel map.map = &mem_map; 638c2d0b470SArd Biesheuvel map.map_size = &map_sz; 639c2d0b470SArd Biesheuvel map.desc_size = &desc_size; 640c2d0b470SArd Biesheuvel map.desc_ver = &desc_version; 641c2d0b470SArd Biesheuvel map.key_ptr = &key; 642c2d0b470SArd Biesheuvel map.buff_size = &buff_size; 643c2d0b470SArd Biesheuvel priv.boot_params = boot_params; 644c2d0b470SArd Biesheuvel priv.efi = &boot_params->efi_info; 645c2d0b470SArd Biesheuvel 646c2d0b470SArd Biesheuvel status = allocate_e820(boot_params, &e820ext, &e820ext_size); 647c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 648c2d0b470SArd Biesheuvel return status; 649c2d0b470SArd Biesheuvel 650c2d0b470SArd Biesheuvel /* Might as well exit boot services now */ 651c2d0b470SArd Biesheuvel status = efi_exit_boot_services(handle, &map, &priv, exit_boot_func); 652c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 653c2d0b470SArd Biesheuvel return status; 654c2d0b470SArd Biesheuvel 655c2d0b470SArd Biesheuvel /* Historic? */ 656c2d0b470SArd Biesheuvel boot_params->alt_mem_k = 32 * 1024; 657c2d0b470SArd Biesheuvel 658c2d0b470SArd Biesheuvel status = setup_e820(boot_params, e820ext, e820ext_size); 659c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 660c2d0b470SArd Biesheuvel return status; 661c2d0b470SArd Biesheuvel 662c2d0b470SArd Biesheuvel return EFI_SUCCESS; 663c2d0b470SArd Biesheuvel } 664c2d0b470SArd Biesheuvel 665c2d0b470SArd Biesheuvel /* 6668acf63efSArvind Sankar * On success, we return the address of startup_32, which has potentially been 6678acf63efSArvind Sankar * relocated by efi_relocate_kernel. 6688acf63efSArvind Sankar * On failure, we exit to the firmware via efi_exit instead of returning. 669c2d0b470SArd Biesheuvel */ 6708acf63efSArvind Sankar unsigned long efi_main(efi_handle_t handle, 671c2d0b470SArd Biesheuvel efi_system_table_t *sys_table_arg, 672c2d0b470SArd Biesheuvel struct boot_params *boot_params) 673c2d0b470SArd Biesheuvel { 674c2d0b470SArd Biesheuvel unsigned long bzimage_addr = (unsigned long)startup_32; 675d5cdf4cfSArvind Sankar unsigned long buffer_start, buffer_end; 676c2d0b470SArd Biesheuvel struct setup_header *hdr = &boot_params->hdr; 67720287d56SArd Biesheuvel unsigned long addr, size; 678c2d0b470SArd Biesheuvel efi_status_t status; 679c2d0b470SArd Biesheuvel 680ccc27ae7SArd Biesheuvel efi_system_table = sys_table_arg; 681c2d0b470SArd Biesheuvel /* Check if we were booted by the EFI firmware */ 682ccc27ae7SArd Biesheuvel if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) 6833b8f44fcSArd Biesheuvel efi_exit(handle, EFI_INVALID_PARAMETER); 684c2d0b470SArd Biesheuvel 685*3ba75c13SBaskov Evgeniy efi_dxe_table = get_efi_config_table(EFI_DXE_SERVICES_TABLE_GUID); 686*3ba75c13SBaskov Evgeniy if (efi_dxe_table && 687*3ba75c13SBaskov Evgeniy efi_dxe_table->hdr.signature != EFI_DXE_SERVICES_TABLE_SIGNATURE) { 688*3ba75c13SBaskov Evgeniy efi_warn("Ignoring DXE services table: invalid signature\n"); 689*3ba75c13SBaskov Evgeniy efi_dxe_table = NULL; 690*3ba75c13SBaskov Evgeniy } 691*3ba75c13SBaskov Evgeniy 692c2d0b470SArd Biesheuvel /* 693d5cdf4cfSArvind Sankar * If the kernel isn't already loaded at a suitable address, 694d5cdf4cfSArvind Sankar * relocate it. 695d5cdf4cfSArvind Sankar * 696d5cdf4cfSArvind Sankar * It must be loaded above LOAD_PHYSICAL_ADDR. 697d5cdf4cfSArvind Sankar * 698d5cdf4cfSArvind Sankar * The maximum address for 64-bit is 1 << 46 for 4-level paging. This 699d5cdf4cfSArvind Sankar * is defined as the macro MAXMEM, but unfortunately that is not a 700d5cdf4cfSArvind Sankar * compile-time constant if 5-level paging is configured, so we instead 701d5cdf4cfSArvind Sankar * define our own macro for use here. 702d5cdf4cfSArvind Sankar * 703d5cdf4cfSArvind Sankar * For 32-bit, the maximum address is complicated to figure out, for 704d5cdf4cfSArvind Sankar * now use KERNEL_IMAGE_SIZE, which will be 512MiB, the same as what 705d5cdf4cfSArvind Sankar * KASLR uses. 706d5cdf4cfSArvind Sankar * 70721cb9b41SArvind Sankar * Also relocate it if image_offset is zero, i.e. the kernel wasn't 70821cb9b41SArvind Sankar * loaded by LoadImage, but rather by a bootloader that called the 70921cb9b41SArvind Sankar * handover entry. The reason we must always relocate in this case is 71021cb9b41SArvind Sankar * to handle the case of systemd-boot booting a unified kernel image, 71121cb9b41SArvind Sankar * which is a PE executable that contains the bzImage and an initrd as 71221cb9b41SArvind Sankar * COFF sections. The initrd section is placed after the bzImage 71321cb9b41SArvind Sankar * without ensuring that there are at least init_size bytes available 71421cb9b41SArvind Sankar * for the bzImage, and thus the compressed kernel's startup code may 71521cb9b41SArvind Sankar * overwrite the initrd unless it is moved out of the way. 716c2d0b470SArd Biesheuvel */ 717d5cdf4cfSArvind Sankar 718d5cdf4cfSArvind Sankar buffer_start = ALIGN(bzimage_addr - image_offset, 719d5cdf4cfSArvind Sankar hdr->kernel_alignment); 720d5cdf4cfSArvind Sankar buffer_end = buffer_start + hdr->init_size; 721d5cdf4cfSArvind Sankar 722d5cdf4cfSArvind Sankar if ((buffer_start < LOAD_PHYSICAL_ADDR) || 723d5cdf4cfSArvind Sankar (IS_ENABLED(CONFIG_X86_32) && buffer_end > KERNEL_IMAGE_SIZE) || 724d5cdf4cfSArvind Sankar (IS_ENABLED(CONFIG_X86_64) && buffer_end > MAXMEM_X86_64_4LEVEL) || 72521cb9b41SArvind Sankar (image_offset == 0)) { 726688eb282SArvind Sankar extern char _bss[]; 727688eb282SArvind Sankar 728c2d0b470SArd Biesheuvel status = efi_relocate_kernel(&bzimage_addr, 729688eb282SArvind Sankar (unsigned long)_bss - bzimage_addr, 730688eb282SArvind Sankar hdr->init_size, 731c2d0b470SArd Biesheuvel hdr->pref_address, 732c2d0b470SArd Biesheuvel hdr->kernel_alignment, 733c2d0b470SArd Biesheuvel LOAD_PHYSICAL_ADDR); 734c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 73536bdd0a7SArvind Sankar efi_err("efi_relocate_kernel() failed!\n"); 736c2d0b470SArd Biesheuvel goto fail; 737c2d0b470SArd Biesheuvel } 7381887c9b6SArvind Sankar /* 7391887c9b6SArvind Sankar * Now that we've copied the kernel elsewhere, we no longer 7401887c9b6SArvind Sankar * have a set up block before startup_32(), so reset image_offset 7411887c9b6SArvind Sankar * to zero in case it was set earlier. 7421887c9b6SArvind Sankar */ 7431887c9b6SArvind Sankar image_offset = 0; 744c2d0b470SArd Biesheuvel } 745c2d0b470SArd Biesheuvel 7467dde67f2SArvind Sankar #ifdef CONFIG_CMDLINE_BOOL 747055042beSArvind Sankar status = efi_parse_options(CONFIG_CMDLINE); 748055042beSArvind Sankar if (status != EFI_SUCCESS) { 749055042beSArvind Sankar efi_err("Failed to parse options\n"); 750055042beSArvind Sankar goto fail; 751055042beSArvind Sankar } 7527dde67f2SArvind Sankar #endif 7537dde67f2SArvind Sankar if (!IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) { 7547dde67f2SArvind Sankar unsigned long cmdline_paddr = ((u64)hdr->cmd_line_ptr | 755c2d0b470SArd Biesheuvel ((u64)boot_params->ext_cmd_line_ptr << 32)); 756055042beSArvind Sankar status = efi_parse_options((char *)cmdline_paddr); 757055042beSArvind Sankar if (status != EFI_SUCCESS) { 758055042beSArvind Sankar efi_err("Failed to parse options\n"); 759055042beSArvind Sankar goto fail; 760055042beSArvind Sankar } 7617dde67f2SArvind Sankar } 762c2d0b470SArd Biesheuvel 763c2d0b470SArd Biesheuvel /* 764987053a3SArvind Sankar * At this point, an initrd may already have been loaded by the 765987053a3SArvind Sankar * bootloader and passed via bootparams. We permit an initrd loaded 766987053a3SArvind Sankar * from the LINUX_EFI_INITRD_MEDIA_GUID device path to supersede it. 767987053a3SArvind Sankar * 768987053a3SArvind Sankar * If the device path is not present, any command-line initrd= 769987053a3SArvind Sankar * arguments will be processed only if image is not NULL, which will be 770987053a3SArvind Sankar * the case only if we were loaded via the PE entry point. 771ec93fc37SArd Biesheuvel */ 77220287d56SArd Biesheuvel status = efi_load_initrd(image, &addr, &size, hdr->initrd_addr_max, 77320287d56SArd Biesheuvel ULONG_MAX); 77420287d56SArd Biesheuvel if (status != EFI_SUCCESS) 775ec93fc37SArd Biesheuvel goto fail; 776e9524fb9SArvind Sankar if (size > 0) { 777eed4e019SArvind Sankar efi_set_u64_split(addr, &hdr->ramdisk_image, 778eed4e019SArvind Sankar &boot_params->ext_ramdisk_image); 779eed4e019SArvind Sankar efi_set_u64_split(size, &hdr->ramdisk_size, 780eed4e019SArvind Sankar &boot_params->ext_ramdisk_size); 78179d3219dSArd Biesheuvel } 782ec93fc37SArd Biesheuvel 783ec93fc37SArd Biesheuvel /* 784c2d0b470SArd Biesheuvel * If the boot loader gave us a value for secure_boot then we use that, 785c2d0b470SArd Biesheuvel * otherwise we ask the BIOS. 786c2d0b470SArd Biesheuvel */ 787c2d0b470SArd Biesheuvel if (boot_params->secure_boot == efi_secureboot_mode_unset) 788c2d0b470SArd Biesheuvel boot_params->secure_boot = efi_get_secureboot(); 789c2d0b470SArd Biesheuvel 790c2d0b470SArd Biesheuvel /* Ask the firmware to clear memory on unclean shutdown */ 791c2d0b470SArd Biesheuvel efi_enable_reset_attack_mitigation(); 792c2d0b470SArd Biesheuvel 793c2d0b470SArd Biesheuvel efi_random_get_seed(); 794c2d0b470SArd Biesheuvel 795c2d0b470SArd Biesheuvel efi_retrieve_tpm2_eventlog(); 796c2d0b470SArd Biesheuvel 797c2d0b470SArd Biesheuvel setup_graphics(boot_params); 798c2d0b470SArd Biesheuvel 799c2d0b470SArd Biesheuvel setup_efi_pci(boot_params); 800c2d0b470SArd Biesheuvel 801c2d0b470SArd Biesheuvel setup_quirks(boot_params); 802c2d0b470SArd Biesheuvel 803c2d0b470SArd Biesheuvel status = exit_boot(boot_params, handle); 804c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 80536bdd0a7SArvind Sankar efi_err("exit_boot() failed!\n"); 806c2d0b470SArd Biesheuvel goto fail; 807c2d0b470SArd Biesheuvel } 808c2d0b470SArd Biesheuvel 8098acf63efSArvind Sankar return bzimage_addr; 810c2d0b470SArd Biesheuvel fail: 81136bdd0a7SArvind Sankar efi_err("efi_main() failed!\n"); 812c2d0b470SArd Biesheuvel 8133b8f44fcSArd Biesheuvel efi_exit(handle, status); 814c2d0b470SArd Biesheuvel } 815