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> 11c2d0b470SArd Biesheuvel 12c2d0b470SArd Biesheuvel #include <asm/efi.h> 13c2d0b470SArd Biesheuvel #include <asm/e820/types.h> 14c2d0b470SArd Biesheuvel #include <asm/setup.h> 15c2d0b470SArd Biesheuvel #include <asm/desc.h> 16c2d0b470SArd Biesheuvel #include <asm/boot.h> 17c2d0b470SArd Biesheuvel 18c2d0b470SArd Biesheuvel #include "efistub.h" 19c2d0b470SArd Biesheuvel 20d5cdf4cfSArvind Sankar /* Maximum physical address for 64-bit kernel with 4-level paging */ 21d5cdf4cfSArvind Sankar #define MAXMEM_X86_64_4LEVEL (1ull << 46) 22d5cdf4cfSArvind Sankar 23ccc27ae7SArd Biesheuvel const efi_system_table_t *efi_system_table; 241887c9b6SArvind Sankar extern u32 image_offset; 25987053a3SArvind Sankar static efi_loaded_image_t *image = NULL; 26c2d0b470SArd Biesheuvel 27c2d0b470SArd Biesheuvel static efi_status_t 28c2d0b470SArd Biesheuvel preserve_pci_rom_image(efi_pci_io_protocol_t *pci, struct pci_setup_rom **__rom) 29c2d0b470SArd Biesheuvel { 30c2d0b470SArd Biesheuvel struct pci_setup_rom *rom = NULL; 31c2d0b470SArd Biesheuvel efi_status_t status; 32c2d0b470SArd Biesheuvel unsigned long size; 33c2d0b470SArd Biesheuvel uint64_t romsize; 34c2d0b470SArd Biesheuvel void *romimage; 35c2d0b470SArd Biesheuvel 36c2d0b470SArd Biesheuvel /* 37c2d0b470SArd Biesheuvel * Some firmware images contain EFI function pointers at the place where 38c2d0b470SArd Biesheuvel * the romimage and romsize fields are supposed to be. Typically the EFI 39c2d0b470SArd Biesheuvel * code is mapped at high addresses, translating to an unrealistically 40c2d0b470SArd Biesheuvel * large romsize. The UEFI spec limits the size of option ROMs to 16 41c2d0b470SArd Biesheuvel * MiB so we reject any ROMs over 16 MiB in size to catch this. 42c2d0b470SArd Biesheuvel */ 43c2d0b470SArd Biesheuvel romimage = efi_table_attr(pci, romimage); 44c2d0b470SArd Biesheuvel romsize = efi_table_attr(pci, romsize); 45c2d0b470SArd Biesheuvel if (!romimage || !romsize || romsize > SZ_16M) 46c2d0b470SArd Biesheuvel return EFI_INVALID_PARAMETER; 47c2d0b470SArd Biesheuvel 48c2d0b470SArd Biesheuvel size = romsize + sizeof(*rom); 49c2d0b470SArd Biesheuvel 50c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 51c2d0b470SArd Biesheuvel (void **)&rom); 52c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 5336bdd0a7SArvind Sankar efi_err("Failed to allocate memory for 'rom'\n"); 54c2d0b470SArd Biesheuvel return status; 55c2d0b470SArd Biesheuvel } 56c2d0b470SArd Biesheuvel 57c2d0b470SArd Biesheuvel memset(rom, 0, sizeof(*rom)); 58c2d0b470SArd Biesheuvel 59c2d0b470SArd Biesheuvel rom->data.type = SETUP_PCI; 60c2d0b470SArd Biesheuvel rom->data.len = size - sizeof(struct setup_data); 61c2d0b470SArd Biesheuvel rom->data.next = 0; 62c2d0b470SArd Biesheuvel rom->pcilen = pci->romsize; 63c2d0b470SArd Biesheuvel *__rom = rom; 64c2d0b470SArd Biesheuvel 65c2d0b470SArd Biesheuvel status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16, 66c2d0b470SArd Biesheuvel PCI_VENDOR_ID, 1, &rom->vendor); 67c2d0b470SArd Biesheuvel 68c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 6936bdd0a7SArvind Sankar efi_err("Failed to read rom->vendor\n"); 70c2d0b470SArd Biesheuvel goto free_struct; 71c2d0b470SArd Biesheuvel } 72c2d0b470SArd Biesheuvel 73c2d0b470SArd Biesheuvel status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16, 74c2d0b470SArd Biesheuvel PCI_DEVICE_ID, 1, &rom->devid); 75c2d0b470SArd Biesheuvel 76c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 7736bdd0a7SArvind Sankar efi_err("Failed to read rom->devid\n"); 78c2d0b470SArd Biesheuvel goto free_struct; 79c2d0b470SArd Biesheuvel } 80c2d0b470SArd Biesheuvel 81c2d0b470SArd Biesheuvel status = efi_call_proto(pci, get_location, &rom->segment, &rom->bus, 82c2d0b470SArd Biesheuvel &rom->device, &rom->function); 83c2d0b470SArd Biesheuvel 84c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 85c2d0b470SArd Biesheuvel goto free_struct; 86c2d0b470SArd Biesheuvel 87c2d0b470SArd Biesheuvel memcpy(rom->romdata, romimage, romsize); 88c2d0b470SArd Biesheuvel return status; 89c2d0b470SArd Biesheuvel 90c2d0b470SArd Biesheuvel free_struct: 91c2d0b470SArd Biesheuvel efi_bs_call(free_pool, rom); 92c2d0b470SArd Biesheuvel return status; 93c2d0b470SArd Biesheuvel } 94c2d0b470SArd Biesheuvel 95c2d0b470SArd Biesheuvel /* 96c2d0b470SArd Biesheuvel * There's no way to return an informative status from this function, 97c2d0b470SArd Biesheuvel * because any analysis (and printing of error messages) needs to be 98c2d0b470SArd Biesheuvel * done directly at the EFI function call-site. 99c2d0b470SArd Biesheuvel * 100c2d0b470SArd Biesheuvel * For example, EFI_INVALID_PARAMETER could indicate a bug or maybe we 101c2d0b470SArd Biesheuvel * just didn't find any PCI devices, but there's no way to tell outside 102c2d0b470SArd Biesheuvel * the context of the call. 103c2d0b470SArd Biesheuvel */ 104c2d0b470SArd Biesheuvel static void setup_efi_pci(struct boot_params *params) 105c2d0b470SArd Biesheuvel { 106c2d0b470SArd Biesheuvel efi_status_t status; 107c2d0b470SArd Biesheuvel void **pci_handle = NULL; 108c2d0b470SArd Biesheuvel efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID; 109c2d0b470SArd Biesheuvel unsigned long size = 0; 110c2d0b470SArd Biesheuvel struct setup_data *data; 111c2d0b470SArd Biesheuvel efi_handle_t h; 112c2d0b470SArd Biesheuvel int i; 113c2d0b470SArd Biesheuvel 114c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 115c2d0b470SArd Biesheuvel &pci_proto, NULL, &size, pci_handle); 116c2d0b470SArd Biesheuvel 117c2d0b470SArd Biesheuvel if (status == EFI_BUFFER_TOO_SMALL) { 118c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 119c2d0b470SArd Biesheuvel (void **)&pci_handle); 120c2d0b470SArd Biesheuvel 121c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 12236bdd0a7SArvind Sankar efi_err("Failed to allocate memory for 'pci_handle'\n"); 123c2d0b470SArd Biesheuvel return; 124c2d0b470SArd Biesheuvel } 125c2d0b470SArd Biesheuvel 126c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 127c2d0b470SArd Biesheuvel &pci_proto, NULL, &size, pci_handle); 128c2d0b470SArd Biesheuvel } 129c2d0b470SArd Biesheuvel 130c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 131c2d0b470SArd Biesheuvel goto free_handle; 132c2d0b470SArd Biesheuvel 133c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)params->hdr.setup_data; 134c2d0b470SArd Biesheuvel 135c2d0b470SArd Biesheuvel while (data && data->next) 136c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)data->next; 137c2d0b470SArd Biesheuvel 138c2d0b470SArd Biesheuvel for_each_efi_handle(h, pci_handle, size, i) { 139c2d0b470SArd Biesheuvel efi_pci_io_protocol_t *pci = NULL; 140c2d0b470SArd Biesheuvel struct pci_setup_rom *rom; 141c2d0b470SArd Biesheuvel 142c2d0b470SArd Biesheuvel status = efi_bs_call(handle_protocol, h, &pci_proto, 143c2d0b470SArd Biesheuvel (void **)&pci); 144c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS || !pci) 145c2d0b470SArd Biesheuvel continue; 146c2d0b470SArd Biesheuvel 147c2d0b470SArd Biesheuvel status = preserve_pci_rom_image(pci, &rom); 148c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 149c2d0b470SArd Biesheuvel continue; 150c2d0b470SArd Biesheuvel 151c2d0b470SArd Biesheuvel if (data) 152c2d0b470SArd Biesheuvel data->next = (unsigned long)rom; 153c2d0b470SArd Biesheuvel else 154c2d0b470SArd Biesheuvel params->hdr.setup_data = (unsigned long)rom; 155c2d0b470SArd Biesheuvel 156c2d0b470SArd Biesheuvel data = (struct setup_data *)rom; 157c2d0b470SArd Biesheuvel } 158c2d0b470SArd Biesheuvel 159c2d0b470SArd Biesheuvel free_handle: 160c2d0b470SArd Biesheuvel efi_bs_call(free_pool, pci_handle); 161c2d0b470SArd Biesheuvel } 162c2d0b470SArd Biesheuvel 163c2d0b470SArd Biesheuvel static void retrieve_apple_device_properties(struct boot_params *boot_params) 164c2d0b470SArd Biesheuvel { 165c2d0b470SArd Biesheuvel efi_guid_t guid = APPLE_PROPERTIES_PROTOCOL_GUID; 166c2d0b470SArd Biesheuvel struct setup_data *data, *new; 167c2d0b470SArd Biesheuvel efi_status_t status; 168c2d0b470SArd Biesheuvel u32 size = 0; 169c2d0b470SArd Biesheuvel apple_properties_protocol_t *p; 170c2d0b470SArd Biesheuvel 171c2d0b470SArd Biesheuvel status = efi_bs_call(locate_protocol, &guid, NULL, (void **)&p); 172c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 173c2d0b470SArd Biesheuvel return; 174c2d0b470SArd Biesheuvel 175c2d0b470SArd Biesheuvel if (efi_table_attr(p, version) != 0x10000) { 17636bdd0a7SArvind Sankar efi_err("Unsupported properties proto version\n"); 177c2d0b470SArd Biesheuvel return; 178c2d0b470SArd Biesheuvel } 179c2d0b470SArd Biesheuvel 180c2d0b470SArd Biesheuvel efi_call_proto(p, get_all, NULL, &size); 181c2d0b470SArd Biesheuvel if (!size) 182c2d0b470SArd Biesheuvel return; 183c2d0b470SArd Biesheuvel 184c2d0b470SArd Biesheuvel do { 185c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, 186c2d0b470SArd Biesheuvel size + sizeof(struct setup_data), 187c2d0b470SArd Biesheuvel (void **)&new); 188c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 18936bdd0a7SArvind Sankar efi_err("Failed to allocate memory for 'properties'\n"); 190c2d0b470SArd Biesheuvel return; 191c2d0b470SArd Biesheuvel } 192c2d0b470SArd Biesheuvel 193c2d0b470SArd Biesheuvel status = efi_call_proto(p, get_all, new->data, &size); 194c2d0b470SArd Biesheuvel 195c2d0b470SArd Biesheuvel if (status == EFI_BUFFER_TOO_SMALL) 196c2d0b470SArd Biesheuvel efi_bs_call(free_pool, new); 197c2d0b470SArd Biesheuvel } while (status == EFI_BUFFER_TOO_SMALL); 198c2d0b470SArd Biesheuvel 199c2d0b470SArd Biesheuvel new->type = SETUP_APPLE_PROPERTIES; 200c2d0b470SArd Biesheuvel new->len = size; 201c2d0b470SArd Biesheuvel new->next = 0; 202c2d0b470SArd Biesheuvel 203c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)boot_params->hdr.setup_data; 204c2d0b470SArd Biesheuvel if (!data) { 205c2d0b470SArd Biesheuvel boot_params->hdr.setup_data = (unsigned long)new; 206c2d0b470SArd Biesheuvel } else { 207c2d0b470SArd Biesheuvel while (data->next) 208c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)data->next; 209c2d0b470SArd Biesheuvel data->next = (unsigned long)new; 210c2d0b470SArd Biesheuvel } 211c2d0b470SArd Biesheuvel } 212c2d0b470SArd Biesheuvel 213c2d0b470SArd Biesheuvel static const efi_char16_t apple[] = L"Apple"; 214c2d0b470SArd Biesheuvel 215c2d0b470SArd Biesheuvel static void setup_quirks(struct boot_params *boot_params) 216c2d0b470SArd Biesheuvel { 217c2d0b470SArd Biesheuvel efi_char16_t *fw_vendor = (efi_char16_t *)(unsigned long) 218ccc27ae7SArd Biesheuvel efi_table_attr(efi_system_table, fw_vendor); 219c2d0b470SArd Biesheuvel 220c2d0b470SArd Biesheuvel if (!memcmp(fw_vendor, apple, sizeof(apple))) { 221c2d0b470SArd Biesheuvel if (IS_ENABLED(CONFIG_APPLE_PROPERTIES)) 222c2d0b470SArd Biesheuvel retrieve_apple_device_properties(boot_params); 223c2d0b470SArd Biesheuvel } 224c2d0b470SArd Biesheuvel } 225c2d0b470SArd Biesheuvel 226c2d0b470SArd Biesheuvel /* 227c2d0b470SArd Biesheuvel * See if we have Universal Graphics Adapter (UGA) protocol 228c2d0b470SArd Biesheuvel */ 229c2d0b470SArd Biesheuvel static efi_status_t 230c2d0b470SArd Biesheuvel setup_uga(struct screen_info *si, efi_guid_t *uga_proto, unsigned long size) 231c2d0b470SArd Biesheuvel { 232c2d0b470SArd Biesheuvel efi_status_t status; 233c2d0b470SArd Biesheuvel u32 width, height; 234c2d0b470SArd Biesheuvel void **uga_handle = NULL; 235c2d0b470SArd Biesheuvel efi_uga_draw_protocol_t *uga = NULL, *first_uga; 236c2d0b470SArd Biesheuvel efi_handle_t handle; 237c2d0b470SArd Biesheuvel int i; 238c2d0b470SArd Biesheuvel 239c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 240c2d0b470SArd Biesheuvel (void **)&uga_handle); 241c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 242c2d0b470SArd Biesheuvel return status; 243c2d0b470SArd Biesheuvel 244c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 245c2d0b470SArd Biesheuvel uga_proto, NULL, &size, uga_handle); 246c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 247c2d0b470SArd Biesheuvel goto free_handle; 248c2d0b470SArd Biesheuvel 249c2d0b470SArd Biesheuvel height = 0; 250c2d0b470SArd Biesheuvel width = 0; 251c2d0b470SArd Biesheuvel 252c2d0b470SArd Biesheuvel first_uga = NULL; 253c2d0b470SArd Biesheuvel for_each_efi_handle(handle, uga_handle, size, i) { 254c2d0b470SArd Biesheuvel efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID; 255c2d0b470SArd Biesheuvel u32 w, h, depth, refresh; 256c2d0b470SArd Biesheuvel void *pciio; 257c2d0b470SArd Biesheuvel 258c2d0b470SArd Biesheuvel status = efi_bs_call(handle_protocol, handle, uga_proto, 259c2d0b470SArd Biesheuvel (void **)&uga); 260c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 261c2d0b470SArd Biesheuvel continue; 262c2d0b470SArd Biesheuvel 263c2d0b470SArd Biesheuvel pciio = NULL; 264c2d0b470SArd Biesheuvel efi_bs_call(handle_protocol, handle, &pciio_proto, &pciio); 265c2d0b470SArd Biesheuvel 266c2d0b470SArd Biesheuvel status = efi_call_proto(uga, get_mode, &w, &h, &depth, &refresh); 267c2d0b470SArd Biesheuvel if (status == EFI_SUCCESS && (!first_uga || pciio)) { 268c2d0b470SArd Biesheuvel width = w; 269c2d0b470SArd Biesheuvel height = h; 270c2d0b470SArd Biesheuvel 271c2d0b470SArd Biesheuvel /* 272c2d0b470SArd Biesheuvel * Once we've found a UGA supporting PCIIO, 273c2d0b470SArd Biesheuvel * don't bother looking any further. 274c2d0b470SArd Biesheuvel */ 275c2d0b470SArd Biesheuvel if (pciio) 276c2d0b470SArd Biesheuvel break; 277c2d0b470SArd Biesheuvel 278c2d0b470SArd Biesheuvel first_uga = uga; 279c2d0b470SArd Biesheuvel } 280c2d0b470SArd Biesheuvel } 281c2d0b470SArd Biesheuvel 282c2d0b470SArd Biesheuvel if (!width && !height) 283c2d0b470SArd Biesheuvel goto free_handle; 284c2d0b470SArd Biesheuvel 285c2d0b470SArd Biesheuvel /* EFI framebuffer */ 286c2d0b470SArd Biesheuvel si->orig_video_isVGA = VIDEO_TYPE_EFI; 287c2d0b470SArd Biesheuvel 288c2d0b470SArd Biesheuvel si->lfb_depth = 32; 289c2d0b470SArd Biesheuvel si->lfb_width = width; 290c2d0b470SArd Biesheuvel si->lfb_height = height; 291c2d0b470SArd Biesheuvel 292c2d0b470SArd Biesheuvel si->red_size = 8; 293c2d0b470SArd Biesheuvel si->red_pos = 16; 294c2d0b470SArd Biesheuvel si->green_size = 8; 295c2d0b470SArd Biesheuvel si->green_pos = 8; 296c2d0b470SArd Biesheuvel si->blue_size = 8; 297c2d0b470SArd Biesheuvel si->blue_pos = 0; 298c2d0b470SArd Biesheuvel si->rsvd_size = 8; 299c2d0b470SArd Biesheuvel si->rsvd_pos = 24; 300c2d0b470SArd Biesheuvel 301c2d0b470SArd Biesheuvel free_handle: 302c2d0b470SArd Biesheuvel efi_bs_call(free_pool, uga_handle); 303c2d0b470SArd Biesheuvel 304c2d0b470SArd Biesheuvel return status; 305c2d0b470SArd Biesheuvel } 306c2d0b470SArd Biesheuvel 307c2d0b470SArd Biesheuvel static void setup_graphics(struct boot_params *boot_params) 308c2d0b470SArd Biesheuvel { 309c2d0b470SArd Biesheuvel efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID; 310c2d0b470SArd Biesheuvel struct screen_info *si; 311c2d0b470SArd Biesheuvel efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID; 312c2d0b470SArd Biesheuvel efi_status_t status; 313c2d0b470SArd Biesheuvel unsigned long size; 314c2d0b470SArd Biesheuvel void **gop_handle = NULL; 315c2d0b470SArd Biesheuvel void **uga_handle = NULL; 316c2d0b470SArd Biesheuvel 317c2d0b470SArd Biesheuvel si = &boot_params->screen_info; 318c2d0b470SArd Biesheuvel memset(si, 0, sizeof(*si)); 319c2d0b470SArd Biesheuvel 320c2d0b470SArd Biesheuvel size = 0; 321c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 322c2d0b470SArd Biesheuvel &graphics_proto, NULL, &size, gop_handle); 323c2d0b470SArd Biesheuvel if (status == EFI_BUFFER_TOO_SMALL) 324c2d0b470SArd Biesheuvel status = efi_setup_gop(si, &graphics_proto, size); 325c2d0b470SArd Biesheuvel 326c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 327c2d0b470SArd Biesheuvel size = 0; 328c2d0b470SArd Biesheuvel status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, 329c2d0b470SArd Biesheuvel &uga_proto, NULL, &size, uga_handle); 330c2d0b470SArd Biesheuvel if (status == EFI_BUFFER_TOO_SMALL) 331c2d0b470SArd Biesheuvel setup_uga(si, &uga_proto, size); 332c2d0b470SArd Biesheuvel } 333c2d0b470SArd Biesheuvel } 334c2d0b470SArd Biesheuvel 3353b8f44fcSArd Biesheuvel 3363b8f44fcSArd Biesheuvel static void __noreturn efi_exit(efi_handle_t handle, efi_status_t status) 3373b8f44fcSArd Biesheuvel { 3383b8f44fcSArd Biesheuvel efi_bs_call(exit, handle, status, 0, NULL); 339f3fa0efcSArd Biesheuvel for(;;) 340f3fa0efcSArd Biesheuvel asm("hlt"); 3413b8f44fcSArd Biesheuvel } 3423b8f44fcSArd Biesheuvel 343c2d0b470SArd Biesheuvel void startup_32(struct boot_params *boot_params); 344c2d0b470SArd Biesheuvel 345c2d0b470SArd Biesheuvel void __noreturn efi_stub_entry(efi_handle_t handle, 346c2d0b470SArd Biesheuvel efi_system_table_t *sys_table_arg, 347c2d0b470SArd Biesheuvel struct boot_params *boot_params); 348c2d0b470SArd Biesheuvel 349c2d0b470SArd Biesheuvel /* 350c2d0b470SArd Biesheuvel * Because the x86 boot code expects to be passed a boot_params we 351c2d0b470SArd Biesheuvel * need to create one ourselves (usually the bootloader would create 352c2d0b470SArd Biesheuvel * one for us). 353c2d0b470SArd Biesheuvel */ 354c2d0b470SArd Biesheuvel efi_status_t __efiapi efi_pe_entry(efi_handle_t handle, 355c2d0b470SArd Biesheuvel efi_system_table_t *sys_table_arg) 356c2d0b470SArd Biesheuvel { 357c2d0b470SArd Biesheuvel struct boot_params *boot_params; 358c2d0b470SArd Biesheuvel struct setup_header *hdr; 3591887c9b6SArvind Sankar void *image_base; 360c2d0b470SArd Biesheuvel efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID; 361c2d0b470SArd Biesheuvel int options_size = 0; 362c2d0b470SArd Biesheuvel efi_status_t status; 363c2d0b470SArd Biesheuvel char *cmdline_ptr; 364c2d0b470SArd Biesheuvel unsigned long ramdisk_addr; 365c2d0b470SArd Biesheuvel unsigned long ramdisk_size; 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 393c2d0b470SArd Biesheuvel /* Copy the second sector to boot_params */ 3941887c9b6SArvind Sankar memcpy(&hdr->jump, image_base + 512, 512); 395c2d0b470SArd Biesheuvel 396c2d0b470SArd Biesheuvel /* 397c2d0b470SArd Biesheuvel * Fill out some of the header fields ourselves because the 398c2d0b470SArd Biesheuvel * EFI firmware loader doesn't load the first sector. 399c2d0b470SArd Biesheuvel */ 400c2d0b470SArd Biesheuvel hdr->root_flags = 1; 401c2d0b470SArd Biesheuvel hdr->vid_mode = 0xffff; 402c2d0b470SArd Biesheuvel hdr->boot_flag = 0xAA55; 403c2d0b470SArd Biesheuvel 404c2d0b470SArd Biesheuvel hdr->type_of_loader = 0x21; 405c2d0b470SArd Biesheuvel 406c2d0b470SArd Biesheuvel /* Convert unicode cmdline to ascii */ 407ac82d356SArd Biesheuvel cmdline_ptr = efi_convert_cmdline(image, &options_size, ULONG_MAX); 408c2d0b470SArd Biesheuvel if (!cmdline_ptr) 409c2d0b470SArd Biesheuvel goto fail; 410c2d0b470SArd Biesheuvel 411eed4e019SArvind Sankar efi_set_u64_split((unsigned long)cmdline_ptr, 412eed4e019SArvind Sankar &hdr->cmd_line_ptr, &boot_params->ext_cmd_line_ptr); 413c2d0b470SArd Biesheuvel 414c2d0b470SArd Biesheuvel hdr->ramdisk_image = 0; 415c2d0b470SArd Biesheuvel hdr->ramdisk_size = 0; 416c2d0b470SArd Biesheuvel 417ccc27ae7SArd Biesheuvel efi_stub_entry(handle, sys_table_arg, boot_params); 418c2d0b470SArd Biesheuvel /* not reached */ 419c2d0b470SArd Biesheuvel 420c2d0b470SArd Biesheuvel fail: 421019512f1SArvind Sankar efi_free(sizeof(struct boot_params), (unsigned long)boot_params); 422c2d0b470SArd Biesheuvel 4233b8f44fcSArd Biesheuvel efi_exit(handle, status); 424c2d0b470SArd Biesheuvel } 425c2d0b470SArd Biesheuvel 426c2d0b470SArd Biesheuvel static void add_e820ext(struct boot_params *params, 427c2d0b470SArd Biesheuvel struct setup_data *e820ext, u32 nr_entries) 428c2d0b470SArd Biesheuvel { 429c2d0b470SArd Biesheuvel struct setup_data *data; 430c2d0b470SArd Biesheuvel 431c2d0b470SArd Biesheuvel e820ext->type = SETUP_E820_EXT; 432c2d0b470SArd Biesheuvel e820ext->len = nr_entries * sizeof(struct boot_e820_entry); 433c2d0b470SArd Biesheuvel e820ext->next = 0; 434c2d0b470SArd Biesheuvel 435c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)params->hdr.setup_data; 436c2d0b470SArd Biesheuvel 437c2d0b470SArd Biesheuvel while (data && data->next) 438c2d0b470SArd Biesheuvel data = (struct setup_data *)(unsigned long)data->next; 439c2d0b470SArd Biesheuvel 440c2d0b470SArd Biesheuvel if (data) 441c2d0b470SArd Biesheuvel data->next = (unsigned long)e820ext; 442c2d0b470SArd Biesheuvel else 443c2d0b470SArd Biesheuvel params->hdr.setup_data = (unsigned long)e820ext; 444c2d0b470SArd Biesheuvel } 445c2d0b470SArd Biesheuvel 446c2d0b470SArd Biesheuvel static efi_status_t 447c2d0b470SArd Biesheuvel setup_e820(struct boot_params *params, struct setup_data *e820ext, u32 e820ext_size) 448c2d0b470SArd Biesheuvel { 449c2d0b470SArd Biesheuvel struct boot_e820_entry *entry = params->e820_table; 450c2d0b470SArd Biesheuvel struct efi_info *efi = ¶ms->efi_info; 451c2d0b470SArd Biesheuvel struct boot_e820_entry *prev = NULL; 452c2d0b470SArd Biesheuvel u32 nr_entries; 453c2d0b470SArd Biesheuvel u32 nr_desc; 454c2d0b470SArd Biesheuvel int i; 455c2d0b470SArd Biesheuvel 456c2d0b470SArd Biesheuvel nr_entries = 0; 457c2d0b470SArd Biesheuvel nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size; 458c2d0b470SArd Biesheuvel 459c2d0b470SArd Biesheuvel for (i = 0; i < nr_desc; i++) { 460c2d0b470SArd Biesheuvel efi_memory_desc_t *d; 461c2d0b470SArd Biesheuvel unsigned int e820_type = 0; 462c2d0b470SArd Biesheuvel unsigned long m = efi->efi_memmap; 463c2d0b470SArd Biesheuvel 464c2d0b470SArd Biesheuvel #ifdef CONFIG_X86_64 465c2d0b470SArd Biesheuvel m |= (u64)efi->efi_memmap_hi << 32; 466c2d0b470SArd Biesheuvel #endif 467c2d0b470SArd Biesheuvel 468c2d0b470SArd Biesheuvel d = efi_early_memdesc_ptr(m, efi->efi_memdesc_size, i); 469c2d0b470SArd Biesheuvel switch (d->type) { 470c2d0b470SArd Biesheuvel case EFI_RESERVED_TYPE: 471c2d0b470SArd Biesheuvel case EFI_RUNTIME_SERVICES_CODE: 472c2d0b470SArd Biesheuvel case EFI_RUNTIME_SERVICES_DATA: 473c2d0b470SArd Biesheuvel case EFI_MEMORY_MAPPED_IO: 474c2d0b470SArd Biesheuvel case EFI_MEMORY_MAPPED_IO_PORT_SPACE: 475c2d0b470SArd Biesheuvel case EFI_PAL_CODE: 476c2d0b470SArd Biesheuvel e820_type = E820_TYPE_RESERVED; 477c2d0b470SArd Biesheuvel break; 478c2d0b470SArd Biesheuvel 479c2d0b470SArd Biesheuvel case EFI_UNUSABLE_MEMORY: 480c2d0b470SArd Biesheuvel e820_type = E820_TYPE_UNUSABLE; 481c2d0b470SArd Biesheuvel break; 482c2d0b470SArd Biesheuvel 483c2d0b470SArd Biesheuvel case EFI_ACPI_RECLAIM_MEMORY: 484c2d0b470SArd Biesheuvel e820_type = E820_TYPE_ACPI; 485c2d0b470SArd Biesheuvel break; 486c2d0b470SArd Biesheuvel 487c2d0b470SArd Biesheuvel case EFI_LOADER_CODE: 488c2d0b470SArd Biesheuvel case EFI_LOADER_DATA: 489c2d0b470SArd Biesheuvel case EFI_BOOT_SERVICES_CODE: 490c2d0b470SArd Biesheuvel case EFI_BOOT_SERVICES_DATA: 491c2d0b470SArd Biesheuvel case EFI_CONVENTIONAL_MEMORY: 492c2d0b470SArd Biesheuvel if (efi_soft_reserve_enabled() && 493c2d0b470SArd Biesheuvel (d->attribute & EFI_MEMORY_SP)) 494c2d0b470SArd Biesheuvel e820_type = E820_TYPE_SOFT_RESERVED; 495c2d0b470SArd Biesheuvel else 496c2d0b470SArd Biesheuvel e820_type = E820_TYPE_RAM; 497c2d0b470SArd Biesheuvel break; 498c2d0b470SArd Biesheuvel 499c2d0b470SArd Biesheuvel case EFI_ACPI_MEMORY_NVS: 500c2d0b470SArd Biesheuvel e820_type = E820_TYPE_NVS; 501c2d0b470SArd Biesheuvel break; 502c2d0b470SArd Biesheuvel 503c2d0b470SArd Biesheuvel case EFI_PERSISTENT_MEMORY: 504c2d0b470SArd Biesheuvel e820_type = E820_TYPE_PMEM; 505c2d0b470SArd Biesheuvel break; 506c2d0b470SArd Biesheuvel 507c2d0b470SArd Biesheuvel default: 508c2d0b470SArd Biesheuvel continue; 509c2d0b470SArd Biesheuvel } 510c2d0b470SArd Biesheuvel 511c2d0b470SArd Biesheuvel /* Merge adjacent mappings */ 512c2d0b470SArd Biesheuvel if (prev && prev->type == e820_type && 513c2d0b470SArd Biesheuvel (prev->addr + prev->size) == d->phys_addr) { 514c2d0b470SArd Biesheuvel prev->size += d->num_pages << 12; 515c2d0b470SArd Biesheuvel continue; 516c2d0b470SArd Biesheuvel } 517c2d0b470SArd Biesheuvel 518c2d0b470SArd Biesheuvel if (nr_entries == ARRAY_SIZE(params->e820_table)) { 519c2d0b470SArd Biesheuvel u32 need = (nr_desc - i) * sizeof(struct e820_entry) + 520c2d0b470SArd Biesheuvel sizeof(struct setup_data); 521c2d0b470SArd Biesheuvel 522c2d0b470SArd Biesheuvel if (!e820ext || e820ext_size < need) 523c2d0b470SArd Biesheuvel return EFI_BUFFER_TOO_SMALL; 524c2d0b470SArd Biesheuvel 525c2d0b470SArd Biesheuvel /* boot_params map full, switch to e820 extended */ 526c2d0b470SArd Biesheuvel entry = (struct boot_e820_entry *)e820ext->data; 527c2d0b470SArd Biesheuvel } 528c2d0b470SArd Biesheuvel 529c2d0b470SArd Biesheuvel entry->addr = d->phys_addr; 530c2d0b470SArd Biesheuvel entry->size = d->num_pages << PAGE_SHIFT; 531c2d0b470SArd Biesheuvel entry->type = e820_type; 532c2d0b470SArd Biesheuvel prev = entry++; 533c2d0b470SArd Biesheuvel nr_entries++; 534c2d0b470SArd Biesheuvel } 535c2d0b470SArd Biesheuvel 536c2d0b470SArd Biesheuvel if (nr_entries > ARRAY_SIZE(params->e820_table)) { 537c2d0b470SArd Biesheuvel u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_table); 538c2d0b470SArd Biesheuvel 539c2d0b470SArd Biesheuvel add_e820ext(params, e820ext, nr_e820ext); 540c2d0b470SArd Biesheuvel nr_entries -= nr_e820ext; 541c2d0b470SArd Biesheuvel } 542c2d0b470SArd Biesheuvel 543c2d0b470SArd Biesheuvel params->e820_entries = (u8)nr_entries; 544c2d0b470SArd Biesheuvel 545c2d0b470SArd Biesheuvel return EFI_SUCCESS; 546c2d0b470SArd Biesheuvel } 547c2d0b470SArd Biesheuvel 548c2d0b470SArd Biesheuvel static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext, 549c2d0b470SArd Biesheuvel u32 *e820ext_size) 550c2d0b470SArd Biesheuvel { 551c2d0b470SArd Biesheuvel efi_status_t status; 552c2d0b470SArd Biesheuvel unsigned long size; 553c2d0b470SArd Biesheuvel 554c2d0b470SArd Biesheuvel size = sizeof(struct setup_data) + 555c2d0b470SArd Biesheuvel sizeof(struct e820_entry) * nr_desc; 556c2d0b470SArd Biesheuvel 557c2d0b470SArd Biesheuvel if (*e820ext) { 558c2d0b470SArd Biesheuvel efi_bs_call(free_pool, *e820ext); 559c2d0b470SArd Biesheuvel *e820ext = NULL; 560c2d0b470SArd Biesheuvel *e820ext_size = 0; 561c2d0b470SArd Biesheuvel } 562c2d0b470SArd Biesheuvel 563c2d0b470SArd Biesheuvel status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 564c2d0b470SArd Biesheuvel (void **)e820ext); 565c2d0b470SArd Biesheuvel if (status == EFI_SUCCESS) 566c2d0b470SArd Biesheuvel *e820ext_size = size; 567c2d0b470SArd Biesheuvel 568c2d0b470SArd Biesheuvel return status; 569c2d0b470SArd Biesheuvel } 570c2d0b470SArd Biesheuvel 571c2d0b470SArd Biesheuvel static efi_status_t allocate_e820(struct boot_params *params, 572c2d0b470SArd Biesheuvel struct setup_data **e820ext, 573c2d0b470SArd Biesheuvel u32 *e820ext_size) 574c2d0b470SArd Biesheuvel { 575c2d0b470SArd Biesheuvel unsigned long map_size, desc_size, buff_size; 576c2d0b470SArd Biesheuvel struct efi_boot_memmap boot_map; 577c2d0b470SArd Biesheuvel efi_memory_desc_t *map; 578c2d0b470SArd Biesheuvel efi_status_t status; 579c2d0b470SArd Biesheuvel __u32 nr_desc; 580c2d0b470SArd Biesheuvel 581c2d0b470SArd Biesheuvel boot_map.map = ↦ 582c2d0b470SArd Biesheuvel boot_map.map_size = &map_size; 583c2d0b470SArd Biesheuvel boot_map.desc_size = &desc_size; 584c2d0b470SArd Biesheuvel boot_map.desc_ver = NULL; 585c2d0b470SArd Biesheuvel boot_map.key_ptr = NULL; 586c2d0b470SArd Biesheuvel boot_map.buff_size = &buff_size; 587c2d0b470SArd Biesheuvel 588c2d0b470SArd Biesheuvel status = efi_get_memory_map(&boot_map); 589c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 590c2d0b470SArd Biesheuvel return status; 591c2d0b470SArd Biesheuvel 592c2d0b470SArd Biesheuvel nr_desc = buff_size / desc_size; 593c2d0b470SArd Biesheuvel 594c2d0b470SArd Biesheuvel if (nr_desc > ARRAY_SIZE(params->e820_table)) { 595c2d0b470SArd Biesheuvel u32 nr_e820ext = nr_desc - ARRAY_SIZE(params->e820_table); 596c2d0b470SArd Biesheuvel 597c2d0b470SArd Biesheuvel status = alloc_e820ext(nr_e820ext, e820ext, e820ext_size); 598c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 599c2d0b470SArd Biesheuvel return status; 600c2d0b470SArd Biesheuvel } 601c2d0b470SArd Biesheuvel 602c2d0b470SArd Biesheuvel return EFI_SUCCESS; 603c2d0b470SArd Biesheuvel } 604c2d0b470SArd Biesheuvel 605c2d0b470SArd Biesheuvel struct exit_boot_struct { 606c2d0b470SArd Biesheuvel struct boot_params *boot_params; 607c2d0b470SArd Biesheuvel struct efi_info *efi; 608c2d0b470SArd Biesheuvel }; 609c2d0b470SArd Biesheuvel 610c2d0b470SArd Biesheuvel static efi_status_t exit_boot_func(struct efi_boot_memmap *map, 611c2d0b470SArd Biesheuvel void *priv) 612c2d0b470SArd Biesheuvel { 613c2d0b470SArd Biesheuvel const char *signature; 614c2d0b470SArd Biesheuvel struct exit_boot_struct *p = priv; 615c2d0b470SArd Biesheuvel 616c2d0b470SArd Biesheuvel signature = efi_is_64bit() ? EFI64_LOADER_SIGNATURE 617c2d0b470SArd Biesheuvel : EFI32_LOADER_SIGNATURE; 618c2d0b470SArd Biesheuvel memcpy(&p->efi->efi_loader_signature, signature, sizeof(__u32)); 619c2d0b470SArd Biesheuvel 620eed4e019SArvind Sankar efi_set_u64_split((unsigned long)efi_system_table, 621eed4e019SArvind Sankar &p->efi->efi_systab, &p->efi->efi_systab_hi); 622c2d0b470SArd Biesheuvel p->efi->efi_memdesc_size = *map->desc_size; 623c2d0b470SArd Biesheuvel p->efi->efi_memdesc_version = *map->desc_ver; 624eed4e019SArvind Sankar efi_set_u64_split((unsigned long)*map->map, 625eed4e019SArvind Sankar &p->efi->efi_memmap, &p->efi->efi_memmap_hi); 626c2d0b470SArd Biesheuvel p->efi->efi_memmap_size = *map->map_size; 627c2d0b470SArd Biesheuvel 628c2d0b470SArd Biesheuvel return EFI_SUCCESS; 629c2d0b470SArd Biesheuvel } 630c2d0b470SArd Biesheuvel 631c2d0b470SArd Biesheuvel static efi_status_t exit_boot(struct boot_params *boot_params, void *handle) 632c2d0b470SArd Biesheuvel { 633c2d0b470SArd Biesheuvel unsigned long map_sz, key, desc_size, buff_size; 634c2d0b470SArd Biesheuvel efi_memory_desc_t *mem_map; 635c2d0b470SArd Biesheuvel struct setup_data *e820ext = NULL; 636c2d0b470SArd Biesheuvel __u32 e820ext_size = 0; 637c2d0b470SArd Biesheuvel efi_status_t status; 638c2d0b470SArd Biesheuvel __u32 desc_version; 639c2d0b470SArd Biesheuvel struct efi_boot_memmap map; 640c2d0b470SArd Biesheuvel struct exit_boot_struct priv; 641c2d0b470SArd Biesheuvel 642c2d0b470SArd Biesheuvel map.map = &mem_map; 643c2d0b470SArd Biesheuvel map.map_size = &map_sz; 644c2d0b470SArd Biesheuvel map.desc_size = &desc_size; 645c2d0b470SArd Biesheuvel map.desc_ver = &desc_version; 646c2d0b470SArd Biesheuvel map.key_ptr = &key; 647c2d0b470SArd Biesheuvel map.buff_size = &buff_size; 648c2d0b470SArd Biesheuvel priv.boot_params = boot_params; 649c2d0b470SArd Biesheuvel priv.efi = &boot_params->efi_info; 650c2d0b470SArd Biesheuvel 651c2d0b470SArd Biesheuvel status = allocate_e820(boot_params, &e820ext, &e820ext_size); 652c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 653c2d0b470SArd Biesheuvel return status; 654c2d0b470SArd Biesheuvel 655c2d0b470SArd Biesheuvel /* Might as well exit boot services now */ 656c2d0b470SArd Biesheuvel status = efi_exit_boot_services(handle, &map, &priv, exit_boot_func); 657c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 658c2d0b470SArd Biesheuvel return status; 659c2d0b470SArd Biesheuvel 660c2d0b470SArd Biesheuvel /* Historic? */ 661c2d0b470SArd Biesheuvel boot_params->alt_mem_k = 32 * 1024; 662c2d0b470SArd Biesheuvel 663c2d0b470SArd Biesheuvel status = setup_e820(boot_params, e820ext, e820ext_size); 664c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) 665c2d0b470SArd Biesheuvel return status; 666c2d0b470SArd Biesheuvel 667c2d0b470SArd Biesheuvel return EFI_SUCCESS; 668c2d0b470SArd Biesheuvel } 669c2d0b470SArd Biesheuvel 670c2d0b470SArd Biesheuvel /* 6718acf63efSArvind Sankar * On success, we return the address of startup_32, which has potentially been 6728acf63efSArvind Sankar * relocated by efi_relocate_kernel. 6738acf63efSArvind Sankar * On failure, we exit to the firmware via efi_exit instead of returning. 674c2d0b470SArd Biesheuvel */ 6758acf63efSArvind Sankar unsigned long efi_main(efi_handle_t handle, 676c2d0b470SArd Biesheuvel efi_system_table_t *sys_table_arg, 677c2d0b470SArd Biesheuvel struct boot_params *boot_params) 678c2d0b470SArd Biesheuvel { 679c2d0b470SArd Biesheuvel unsigned long bzimage_addr = (unsigned long)startup_32; 680d5cdf4cfSArvind Sankar unsigned long buffer_start, buffer_end; 681c2d0b470SArd Biesheuvel struct setup_header *hdr = &boot_params->hdr; 682c2d0b470SArd Biesheuvel efi_status_t status; 683c2d0b470SArd Biesheuvel unsigned long cmdline_paddr; 684c2d0b470SArd Biesheuvel 685ccc27ae7SArd Biesheuvel efi_system_table = sys_table_arg; 686c2d0b470SArd Biesheuvel 687c2d0b470SArd Biesheuvel /* Check if we were booted by the EFI firmware */ 688ccc27ae7SArd Biesheuvel if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE) 6893b8f44fcSArd Biesheuvel efi_exit(handle, EFI_INVALID_PARAMETER); 690c2d0b470SArd Biesheuvel 691c2d0b470SArd Biesheuvel /* 692d5cdf4cfSArvind Sankar * If the kernel isn't already loaded at a suitable address, 693d5cdf4cfSArvind Sankar * relocate it. 694d5cdf4cfSArvind Sankar * 695d5cdf4cfSArvind Sankar * It must be loaded above LOAD_PHYSICAL_ADDR. 696d5cdf4cfSArvind Sankar * 697d5cdf4cfSArvind Sankar * The maximum address for 64-bit is 1 << 46 for 4-level paging. This 698d5cdf4cfSArvind Sankar * is defined as the macro MAXMEM, but unfortunately that is not a 699d5cdf4cfSArvind Sankar * compile-time constant if 5-level paging is configured, so we instead 700d5cdf4cfSArvind Sankar * define our own macro for use here. 701d5cdf4cfSArvind Sankar * 702d5cdf4cfSArvind Sankar * For 32-bit, the maximum address is complicated to figure out, for 703d5cdf4cfSArvind Sankar * now use KERNEL_IMAGE_SIZE, which will be 512MiB, the same as what 704d5cdf4cfSArvind Sankar * KASLR uses. 705d5cdf4cfSArvind Sankar * 70621cb9b41SArvind Sankar * Also relocate it if image_offset is zero, i.e. the kernel wasn't 70721cb9b41SArvind Sankar * loaded by LoadImage, but rather by a bootloader that called the 70821cb9b41SArvind Sankar * handover entry. The reason we must always relocate in this case is 70921cb9b41SArvind Sankar * to handle the case of systemd-boot booting a unified kernel image, 71021cb9b41SArvind Sankar * which is a PE executable that contains the bzImage and an initrd as 71121cb9b41SArvind Sankar * COFF sections. The initrd section is placed after the bzImage 71221cb9b41SArvind Sankar * without ensuring that there are at least init_size bytes available 71321cb9b41SArvind Sankar * for the bzImage, and thus the compressed kernel's startup code may 71421cb9b41SArvind Sankar * overwrite the initrd unless it is moved out of the way. 715c2d0b470SArd Biesheuvel */ 716d5cdf4cfSArvind Sankar 717d5cdf4cfSArvind Sankar buffer_start = ALIGN(bzimage_addr - image_offset, 718d5cdf4cfSArvind Sankar hdr->kernel_alignment); 719d5cdf4cfSArvind Sankar buffer_end = buffer_start + hdr->init_size; 720d5cdf4cfSArvind Sankar 721d5cdf4cfSArvind Sankar if ((buffer_start < LOAD_PHYSICAL_ADDR) || 722d5cdf4cfSArvind Sankar (IS_ENABLED(CONFIG_X86_32) && buffer_end > KERNEL_IMAGE_SIZE) || 723d5cdf4cfSArvind Sankar (IS_ENABLED(CONFIG_X86_64) && buffer_end > MAXMEM_X86_64_4LEVEL) || 72421cb9b41SArvind Sankar (image_offset == 0)) { 725c2d0b470SArd Biesheuvel status = efi_relocate_kernel(&bzimage_addr, 726c2d0b470SArd Biesheuvel hdr->init_size, hdr->init_size, 727c2d0b470SArd Biesheuvel hdr->pref_address, 728c2d0b470SArd Biesheuvel hdr->kernel_alignment, 729c2d0b470SArd Biesheuvel LOAD_PHYSICAL_ADDR); 730c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 73136bdd0a7SArvind Sankar efi_err("efi_relocate_kernel() failed!\n"); 732c2d0b470SArd Biesheuvel goto fail; 733c2d0b470SArd Biesheuvel } 7341887c9b6SArvind Sankar /* 7351887c9b6SArvind Sankar * Now that we've copied the kernel elsewhere, we no longer 7361887c9b6SArvind Sankar * have a set up block before startup_32(), so reset image_offset 7371887c9b6SArvind Sankar * to zero in case it was set earlier. 7381887c9b6SArvind Sankar */ 7391887c9b6SArvind Sankar image_offset = 0; 740c2d0b470SArd Biesheuvel } 741c2d0b470SArd Biesheuvel 742c2d0b470SArd Biesheuvel cmdline_paddr = ((u64)hdr->cmd_line_ptr | 743c2d0b470SArd Biesheuvel ((u64)boot_params->ext_cmd_line_ptr << 32)); 744c2d0b470SArd Biesheuvel efi_parse_options((char *)cmdline_paddr); 745c2d0b470SArd Biesheuvel 746c2d0b470SArd Biesheuvel /* 747987053a3SArvind Sankar * At this point, an initrd may already have been loaded by the 748987053a3SArvind Sankar * bootloader and passed via bootparams. We permit an initrd loaded 749987053a3SArvind Sankar * from the LINUX_EFI_INITRD_MEDIA_GUID device path to supersede it. 750987053a3SArvind Sankar * 751987053a3SArvind Sankar * If the device path is not present, any command-line initrd= 752987053a3SArvind Sankar * arguments will be processed only if image is not NULL, which will be 753987053a3SArvind Sankar * the case only if we were loaded via the PE entry point. 754ec93fc37SArd Biesheuvel */ 755980771f6SArd Biesheuvel if (!efi_noinitrd) { 75679d3219dSArd Biesheuvel unsigned long addr, size; 75779d3219dSArd Biesheuvel 758ac82d356SArd Biesheuvel status = efi_load_initrd_dev_path(&addr, &size, ULONG_MAX); 759987053a3SArvind Sankar if (status == EFI_NOT_FOUND) { 760987053a3SArvind Sankar if (efi_is_native() && image != NULL) { 761987053a3SArvind Sankar status = efi_load_initrd(image, &addr, &size, 762987053a3SArvind Sankar hdr->initrd_addr_max, 763987053a3SArvind Sankar ULONG_MAX); 764987053a3SArvind Sankar } else { 765987053a3SArvind Sankar addr = size = 0; 766987053a3SArvind Sankar status = EFI_SUCCESS; 767987053a3SArvind Sankar } 768987053a3SArvind Sankar } 769987053a3SArvind Sankar 770987053a3SArvind Sankar if (status != EFI_SUCCESS) { 771987053a3SArvind Sankar efi_err("Failed to load initrd!\n"); 772987053a3SArvind Sankar goto fail; 773987053a3SArvind Sankar } 774eed4e019SArvind Sankar efi_set_u64_split(addr, &hdr->ramdisk_image, 775eed4e019SArvind Sankar &boot_params->ext_ramdisk_image); 776eed4e019SArvind Sankar efi_set_u64_split(size, &hdr->ramdisk_size, 777eed4e019SArvind Sankar &boot_params->ext_ramdisk_size); 77879d3219dSArd Biesheuvel } 779ec93fc37SArd Biesheuvel 780ec93fc37SArd Biesheuvel /* 781c2d0b470SArd Biesheuvel * If the boot loader gave us a value for secure_boot then we use that, 782c2d0b470SArd Biesheuvel * otherwise we ask the BIOS. 783c2d0b470SArd Biesheuvel */ 784c2d0b470SArd Biesheuvel if (boot_params->secure_boot == efi_secureboot_mode_unset) 785c2d0b470SArd Biesheuvel boot_params->secure_boot = efi_get_secureboot(); 786c2d0b470SArd Biesheuvel 787c2d0b470SArd Biesheuvel /* Ask the firmware to clear memory on unclean shutdown */ 788c2d0b470SArd Biesheuvel efi_enable_reset_attack_mitigation(); 789c2d0b470SArd Biesheuvel 790c2d0b470SArd Biesheuvel efi_random_get_seed(); 791c2d0b470SArd Biesheuvel 792c2d0b470SArd Biesheuvel efi_retrieve_tpm2_eventlog(); 793c2d0b470SArd Biesheuvel 794c2d0b470SArd Biesheuvel setup_graphics(boot_params); 795c2d0b470SArd Biesheuvel 796c2d0b470SArd Biesheuvel setup_efi_pci(boot_params); 797c2d0b470SArd Biesheuvel 798c2d0b470SArd Biesheuvel setup_quirks(boot_params); 799c2d0b470SArd Biesheuvel 800c2d0b470SArd Biesheuvel status = exit_boot(boot_params, handle); 801c2d0b470SArd Biesheuvel if (status != EFI_SUCCESS) { 80236bdd0a7SArvind Sankar efi_err("exit_boot() failed!\n"); 803c2d0b470SArd Biesheuvel goto fail; 804c2d0b470SArd Biesheuvel } 805c2d0b470SArd Biesheuvel 8068acf63efSArvind Sankar return bzimage_addr; 807c2d0b470SArd Biesheuvel fail: 80836bdd0a7SArvind Sankar efi_err("efi_main() failed!\n"); 809c2d0b470SArd Biesheuvel 8103b8f44fcSArd Biesheuvel efi_exit(handle, status); 811c2d0b470SArd Biesheuvel } 812