arch/x86/boot/compressed/eboot.c

   1 /* -----------------------------------------------------------------------
   2  *
   3  *   Copyright 2011 Intel Corporation; author Matt Fleming
   4  *
   5  *   This file is part of the Linux kernel, and is made available under
   6  *   the terms of the GNU General Public License version 2.
   7  *
   8  * ----------------------------------------------------------------------- */
   9
  10 #include <linux/efi.h>
  11 #include <linux/pci.h>
  12
  13 #include <asm/efi.h>
  14 #include <asm/e820/types.h>
  15 #include <asm/setup.h>
  16 #include <asm/desc.h>
  17
  18 #include "../string.h"
  19 #include "eboot.h"
  20
  21 static efi_system_table_t *sys_table;
  22
  23 static struct efi_config *efi_early;
  24
  25 __pure const struct efi_config *__efi_early(void)
  26 {
  27         return efi_early;
  28 }
  29
  30 #define BOOT_SERVICES(bits)                                             \
  31 static void setup_boot_services##bits(struct efi_config *c)             \
  32 {                                                                       \
  33         efi_system_table_##bits##_t *table;                             \
  34                                                                         \
  35         table = (typeof(table))sys_table;                               \
  36                                                                         \
  37         c->runtime_services = table->runtime;                           \
  38         c->boot_services = table->boottime;                             \
  39         c->text_output = table->con_out;                                \
  40 }
  41 BOOT_SERVICES(32);
  42 BOOT_SERVICES(64);
  43
  44 static inline efi_status_t __open_volume32(void *__image, void **__fh)
  45 {
  46         efi_file_io_interface_t *io;
  47         efi_loaded_image_32_t *image = __image;
  48         efi_file_handle_32_t *fh;
  49         efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
  50         efi_status_t status;
  51         void *handle = (void *)(unsigned long)image->device_handle;
  52         unsigned long func;
  53
  54         status = efi_call_early(handle_protocol, handle,
  55                                 &fs_proto, (void **)&io);
  56         if (status != EFI_SUCCESS) {
  57                 efi_printk(sys_table, "Failed to handle fs_proto\n");
  58                 return status;
  59         }
  60
  61         func = (unsigned long)io->open_volume;
  62         status = efi_early->call(func, io, &fh);
  63         if (status != EFI_SUCCESS)
  64                 efi_printk(sys_table, "Failed to open volume\n");
  65
  66         *__fh = fh;
  67         return status;
  68 }
  69
  70 static inline efi_status_t __open_volume64(void *__image, void **__fh)
  71 {
  72         efi_file_io_interface_t *io;
  73         efi_loaded_image_64_t *image = __image;
  74         efi_file_handle_64_t *fh;
  75         efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
  76         efi_status_t status;
  77         void *handle = (void *)(unsigned long)image->device_handle;
  78         unsigned long func;
  79
  80         status = efi_call_early(handle_protocol, handle,
  81                                 &fs_proto, (void **)&io);
  82         if (status != EFI_SUCCESS) {
  83                 efi_printk(sys_table, "Failed to handle fs_proto\n");
  84                 return status;
  85         }
  86
  87         func = (unsigned long)io->open_volume;
  88         status = efi_early->call(func, io, &fh);
  89         if (status != EFI_SUCCESS)
  90                 efi_printk(sys_table, "Failed to open volume\n");
  91
  92         *__fh = fh;
  93         return status;
  94 }
  95
  96 efi_status_t
  97 efi_open_volume(efi_system_table_t *sys_table, void *__image, void **__fh)
  98 {
  99         if (efi_early->is64)
 100                 return __open_volume64(__image, __fh);
 101
 102         return __open_volume32(__image, __fh);
 103 }
 104
 105 void efi_char16_printk(efi_system_table_t *table, efi_char16_t *str)
 106 {
 107         efi_call_proto(efi_simple_text_output_protocol, output_string,
 108                        efi_early->text_output, str);
 109 }
 110
 111 static efi_status_t
 112 __setup_efi_pci(efi_pci_io_protocol_t *pci, struct pci_setup_rom **__rom)
 113 {
 114         struct pci_setup_rom *rom = NULL;
 115         efi_status_t status;
 116         unsigned long size;
 117         uint64_t attributes, romsize;
 118         void *romimage;
 119
 120         status = efi_call_proto(efi_pci_io_protocol, attributes, pci,
 121                                 EfiPciIoAttributeOperationGet, 0, 0,
 122                                 &attributes);
 123         if (status != EFI_SUCCESS)
 124                 return status;
 125
 126         /*
 127          * Some firmware images contain EFI function pointers at the place where the
 128          * romimage and romsize fields are supposed to be. Typically the EFI
 129          * code is mapped at high addresses, translating to an unrealistically
 130          * large romsize. The UEFI spec limits the size of option ROMs to 16
 131          * MiB so we reject any ROMs over 16 MiB in size to catch this.
 132          */
 133         romimage = (void *)(unsigned long)efi_table_attr(efi_pci_io_protocol,
 134                                                          romimage, pci);
 135         romsize = efi_table_attr(efi_pci_io_protocol, romsize, pci);
 136         if (!romimage || !romsize || romsize > SZ_16M)
 137                 return EFI_INVALID_PARAMETER;
 138
 139         size = romsize + sizeof(*rom);
 140
 141         status = efi_call_early(allocate_pool, EFI_LOADER_DATA, size, &rom);
 142         if (status != EFI_SUCCESS) {
 143                 efi_printk(sys_table, "Failed to alloc mem for rom\n");
 144                 return status;
 145         }
 146
 147         memset(rom, 0, sizeof(*rom));
 148
 149         rom->data.type = SETUP_PCI;
 150         rom->data.len = size - sizeof(struct setup_data);
 151         rom->data.next = 0;
 152         rom->pcilen = pci->romsize;
 153         *__rom = rom;
 154
 155         status = efi_call_proto(efi_pci_io_protocol, pci.read, pci,
 156                                 EfiPciIoWidthUint16, PCI_VENDOR_ID, 1,
 157                                 &rom->vendor);
 158
 159         if (status != EFI_SUCCESS) {
 160                 efi_printk(sys_table, "Failed to read rom->vendor\n");
 161                 goto free_struct;
 162         }
 163
 164         status = efi_call_proto(efi_pci_io_protocol, pci.read, pci,
 165                                 EfiPciIoWidthUint16, PCI_DEVICE_ID, 1,
 166                                 &rom->devid);
 167
 168         if (status != EFI_SUCCESS) {
 169                 efi_printk(sys_table, "Failed to read rom->devid\n");
 170                 goto free_struct;
 171         }
 172
 173         status = efi_call_proto(efi_pci_io_protocol, get_location, pci,
 174                                 &rom->segment, &rom->bus, &rom->device,
 175                                 &rom->function);
 176
 177         if (status != EFI_SUCCESS)
 178                 goto free_struct;
 179
 180         memcpy(rom->romdata, romimage, romsize);
 181         return status;
 182
 183 free_struct:
 184         efi_call_early(free_pool, rom);
 185         return status;
 186 }
 187
 188 static void
 189 setup_efi_pci32(struct boot_params *params, void **pci_handle,
 190                 unsigned long size)
 191 {
 192         efi_pci_io_protocol_t *pci = NULL;
 193         efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
 194         u32 *handles = (u32 *)(unsigned long)pci_handle;
 195         efi_status_t status;
 196         unsigned long nr_pci;
 197         struct setup_data *data;
 198         int i;
 199
 200         data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
 201
 202         while (data && data->next)
 203                 data = (struct setup_data *)(unsigned long)data->next;
 204
 205         nr_pci = size / sizeof(u32);
 206         for (i = 0; i < nr_pci; i++) {
 207                 struct pci_setup_rom *rom = NULL;
 208                 u32 h = handles[i];
 209
 210                 status = efi_call_early(handle_protocol, h,
 211                                         &pci_proto, (void **)&pci);
 212
 213                 if (status != EFI_SUCCESS)
 214                         continue;
 215
 216                 if (!pci)
 217                         continue;
 218
 219                 status = __setup_efi_pci(pci, &rom);
 220                 if (status != EFI_SUCCESS)
 221                         continue;
 222
 223                 if (data)
 224                         data->next = (unsigned long)rom;
 225                 else
 226                         params->hdr.setup_data = (unsigned long)rom;
 227
 228                 data = (struct setup_data *)rom;
 229
 230         }
 231 }
 232
 233 static void
 234 setup_efi_pci64(struct boot_params *params, void **pci_handle,
 235                 unsigned long size)
 236 {
 237         efi_pci_io_protocol_t *pci = NULL;
 238         efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
 239         u64 *handles = (u64 *)(unsigned long)pci_handle;
 240         efi_status_t status;
 241         unsigned long nr_pci;
 242         struct setup_data *data;
 243         int i;
 244
 245         data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
 246
 247         while (data && data->next)
 248                 data = (struct setup_data *)(unsigned long)data->next;
 249
 250         nr_pci = size / sizeof(u64);
 251         for (i = 0; i < nr_pci; i++) {
 252                 struct pci_setup_rom *rom = NULL;
 253                 u64 h = handles[i];
 254
 255                 status = efi_call_early(handle_protocol, h,
 256                                         &pci_proto, (void **)&pci);
 257
 258                 if (status != EFI_SUCCESS)
 259                         continue;
 260
 261                 if (!pci)
 262                         continue;
 263
 264                 status = __setup_efi_pci(pci, &rom);
 265                 if (status != EFI_SUCCESS)
 266                         continue;
 267
 268                 if (data)
 269                         data->next = (unsigned long)rom;
 270                 else
 271                         params->hdr.setup_data = (unsigned long)rom;
 272
 273                 data = (struct setup_data *)rom;
 274
 275         }
 276 }
 277
 278 /*
 279  * There's no way to return an informative status from this function,
 280  * because any analysis (and printing of error messages) needs to be
 281  * done directly at the EFI function call-site.
 282  *
 283  * For example, EFI_INVALID_PARAMETER could indicate a bug or maybe we
 284  * just didn't find any PCI devices, but there's no way to tell outside
 285  * the context of the call.
 286  */
 287 static void setup_efi_pci(struct boot_params *params)
 288 {
 289         efi_status_t status;
 290         void **pci_handle = NULL;
 291         efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
 292         unsigned long size = 0;
 293
 294         status = efi_call_early(locate_handle,
 295                                 EFI_LOCATE_BY_PROTOCOL,
 296                                 &pci_proto, NULL, &size, pci_handle);
 297
 298         if (status == EFI_BUFFER_TOO_SMALL) {
 299                 status = efi_call_early(allocate_pool,
 300                                         EFI_LOADER_DATA,
 301                                         size, (void **)&pci_handle);
 302
 303                 if (status != EFI_SUCCESS) {
 304                         efi_printk(sys_table, "Failed to alloc mem for pci_handle\n");
 305                         return;
 306                 }
 307
 308                 status = efi_call_early(locate_handle,
 309                                         EFI_LOCATE_BY_PROTOCOL, &pci_proto,
 310                                         NULL, &size, pci_handle);
 311         }
 312
 313         if (status != EFI_SUCCESS)
 314                 goto free_handle;
 315
 316         if (efi_early->is64)
 317                 setup_efi_pci64(params, pci_handle, size);
 318         else
 319                 setup_efi_pci32(params, pci_handle, size);
 320
 321 free_handle:
 322         efi_call_early(free_pool, pci_handle);
 323 }
 324
 325 static void retrieve_apple_device_properties(struct boot_params *boot_params)
 326 {
 327         efi_guid_t guid = APPLE_PROPERTIES_PROTOCOL_GUID;
 328         struct setup_data *data, *new;
 329         efi_status_t status;
 330         u32 size = 0;
 331         void *p;
 332
 333         status = efi_call_early(locate_protocol, &guid, NULL, &p);
 334         if (status != EFI_SUCCESS)
 335                 return;
 336
 337         if (efi_table_attr(apple_properties_protocol, version, p) != 0x10000) {
 338                 efi_printk(sys_table, "Unsupported properties proto version\n");
 339                 return;
 340         }
 341
 342         efi_call_proto(apple_properties_protocol, get_all, p, NULL, &size);
 343         if (!size)
 344                 return;
 345
 346         do {
 347                 status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
 348                                         size + sizeof(struct setup_data), &new);
 349                 if (status != EFI_SUCCESS) {
 350                         efi_printk(sys_table,
 351                                         "Failed to alloc mem for properties\n");
 352                         return;
 353                 }
 354
 355                 status = efi_call_proto(apple_properties_protocol, get_all, p,
 356                                         new->data, &size);
 357
 358                 if (status == EFI_BUFFER_TOO_SMALL)
 359                         efi_call_early(free_pool, new);
 360         } while (status == EFI_BUFFER_TOO_SMALL);
 361
 362         new->type = SETUP_APPLE_PROPERTIES;
 363         new->len  = size;
 364         new->next = 0;
 365
 366         data = (struct setup_data *)(unsigned long)boot_params->hdr.setup_data;
 367         if (!data)
 368                 boot_params->hdr.setup_data = (unsigned long)new;
 369         else {
 370                 while (data->next)
 371                         data = (struct setup_data *)(unsigned long)data->next;
 372                 data->next = (unsigned long)new;
 373         }
 374 }
 375
 376 static const efi_char16_t apple[] = L"Apple";
 377
 378 static void setup_quirks(struct boot_params *boot_params)
 379 {
 380         efi_char16_t *fw_vendor = (efi_char16_t *)(unsigned long)
 381                 efi_table_attr(efi_system_table, fw_vendor, sys_table);
 382
 383         if (!memcmp(fw_vendor, apple, sizeof(apple))) {
 384                 if (IS_ENABLED(CONFIG_APPLE_PROPERTIES))
 385                         retrieve_apple_device_properties(boot_params);
 386         }
 387 }
 388
 389 static efi_status_t
 390 setup_uga32(void **uga_handle, unsigned long size, u32 *width, u32 *height)
 391 {
 392         struct efi_uga_draw_protocol *uga = NULL, *first_uga;
 393         efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
 394         unsigned long nr_ugas;
 395         u32 *handles = (u32 *)uga_handle;
 396         efi_status_t status = EFI_INVALID_PARAMETER;
 397         int i;
 398
 399         first_uga = NULL;
 400         nr_ugas = size / sizeof(u32);
 401         for (i = 0; i < nr_ugas; i++) {
 402                 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
 403                 u32 w, h, depth, refresh;
 404                 void *pciio;
 405                 u32 handle = handles[i];
 406
 407                 status = efi_call_early(handle_protocol, handle,
 408                                         &uga_proto, (void **)&uga);
 409                 if (status != EFI_SUCCESS)
 410                         continue;
 411
 412                 efi_call_early(handle_protocol, handle, &pciio_proto, &pciio);
 413
 414                 status = efi_early->call((unsigned long)uga->get_mode, uga,
 415                                          &w, &h, &depth, &refresh);
 416                 if (status == EFI_SUCCESS && (!first_uga || pciio)) {
 417                         *width = w;
 418                         *height = h;
 419
 420                         /*
 421                          * Once we've found a UGA supporting PCIIO,
 422                          * don't bother looking any further.
 423                          */
 424                         if (pciio)
 425                                 break;
 426
 427                         first_uga = uga;
 428                 }
 429         }
 430
 431         return status;
 432 }
 433
 434 static efi_status_t
 435 setup_uga64(void **uga_handle, unsigned long size, u32 *width, u32 *height)
 436 {
 437         struct efi_uga_draw_protocol *uga = NULL, *first_uga;
 438         efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
 439         unsigned long nr_ugas;
 440         u64 *handles = (u64 *)uga_handle;
 441         efi_status_t status = EFI_INVALID_PARAMETER;
 442         int i;
 443
 444         first_uga = NULL;
 445         nr_ugas = size / sizeof(u64);
 446         for (i = 0; i < nr_ugas; i++) {
 447                 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
 448                 u32 w, h, depth, refresh;
 449                 void *pciio;
 450                 u64 handle = handles[i];
 451
 452                 status = efi_call_early(handle_protocol, handle,
 453                                         &uga_proto, (void **)&uga);
 454                 if (status != EFI_SUCCESS)
 455                         continue;
 456
 457                 efi_call_early(handle_protocol, handle, &pciio_proto, &pciio);
 458
 459                 status = efi_early->call((unsigned long)uga->get_mode, uga,
 460                                          &w, &h, &depth, &refresh);
 461                 if (status == EFI_SUCCESS && (!first_uga || pciio)) {
 462                         *width = w;
 463                         *height = h;
 464
 465                         /*
 466                          * Once we've found a UGA supporting PCIIO,
 467                          * don't bother looking any further.
 468                          */
 469                         if (pciio)
 470                                 break;
 471
 472                         first_uga = uga;
 473                 }
 474         }
 475
 476         return status;
 477 }
 478
 479 /*
 480  * See if we have Universal Graphics Adapter (UGA) protocol
 481  */
 482 static efi_status_t setup_uga(struct screen_info *si, efi_guid_t *uga_proto,
 483                               unsigned long size)
 484 {
 485         efi_status_t status;
 486         u32 width, height;
 487         void **uga_handle = NULL;
 488
 489         status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
 490                                 size, (void **)&uga_handle);
 491         if (status != EFI_SUCCESS)
 492                 return status;
 493
 494         status = efi_call_early(locate_handle,
 495                                 EFI_LOCATE_BY_PROTOCOL,
 496                                 uga_proto, NULL, &size, uga_handle);
 497         if (status != EFI_SUCCESS)
 498                 goto free_handle;
 499
 500         height = 0;
 501         width = 0;
 502
 503         if (efi_early->is64)
 504                 status = setup_uga64(uga_handle, size, &width, &height);
 505         else
 506                 status = setup_uga32(uga_handle, size, &width, &height);
 507
 508         if (!width && !height)
 509                 goto free_handle;
 510
 511         /* EFI framebuffer */
 512         si->orig_video_isVGA = VIDEO_TYPE_EFI;
 513
 514         si->lfb_depth = 32;
 515         si->lfb_width = width;
 516         si->lfb_height = height;
 517
 518         si->red_size = 8;
 519         si->red_pos = 16;
 520         si->green_size = 8;
 521         si->green_pos = 8;
 522         si->blue_size = 8;
 523         si->blue_pos = 0;
 524         si->rsvd_size = 8;
 525         si->rsvd_pos = 24;
 526
 527 free_handle:
 528         efi_call_early(free_pool, uga_handle);
 529         return status;
 530 }
 531
 532 void setup_graphics(struct boot_params *boot_params)
 533 {
 534         efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
 535         struct screen_info *si;
 536         efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
 537         efi_status_t status;
 538         unsigned long size;
 539         void **gop_handle = NULL;
 540         void **uga_handle = NULL;
 541
 542         si = &boot_params->screen_info;
 543         memset(si, 0, sizeof(*si));
 544
 545         size = 0;
 546         status = efi_call_early(locate_handle,
 547                                 EFI_LOCATE_BY_PROTOCOL,
 548                                 &graphics_proto, NULL, &size, gop_handle);
 549         if (status == EFI_BUFFER_TOO_SMALL)
 550                 status = efi_setup_gop(NULL, si, &graphics_proto, size);
 551
 552         if (status != EFI_SUCCESS) {
 553                 size = 0;
 554                 status = efi_call_early(locate_handle,
 555                                         EFI_LOCATE_BY_PROTOCOL,
 556                                         &uga_proto, NULL, &size, uga_handle);
 557                 if (status == EFI_BUFFER_TOO_SMALL)
 558                         setup_uga(si, &uga_proto, size);
 559         }
 560 }
 561
 562 /*
 563  * Because the x86 boot code expects to be passed a boot_params we
 564  * need to create one ourselves (usually the bootloader would create
 565  * one for us).
 566  *
 567  * The caller is responsible for filling out ->code32_start in the
 568  * returned boot_params.
 569  */
 570 struct boot_params *make_boot_params(struct efi_config *c)
 571 {
 572         struct boot_params *boot_params;
 573         struct apm_bios_info *bi;
 574         struct setup_header *hdr;
 575         efi_loaded_image_t *image;
 576         void *options, *handle;
 577         efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
 578         int options_size = 0;
 579         efi_status_t status;
 580         char *cmdline_ptr;
 581         u16 *s2;
 582         u8 *s1;
 583         int i;
 584         unsigned long ramdisk_addr;
 585         unsigned long ramdisk_size;
 586
 587         efi_early = c;
 588         sys_table = (efi_system_table_t *)(unsigned long)efi_early->table;
 589         handle = (void *)(unsigned long)efi_early->image_handle;
 590
 591         /* Check if we were booted by the EFI firmware */
 592         if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 593                 return NULL;
 594
 595         if (efi_early->is64)
 596                 setup_boot_services64(efi_early);
 597         else
 598                 setup_boot_services32(efi_early);
 599
 600         status = efi_call_early(handle_protocol, handle,
 601                                 &proto, (void *)&image);
 602         if (status != EFI_SUCCESS) {
 603                 efi_printk(sys_table, "Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
 604                 return NULL;
 605         }
 606
 607         status = efi_low_alloc(sys_table, 0x4000, 1,
 608                                (unsigned long *)&boot_params);
 609         if (status != EFI_SUCCESS) {
 610                 efi_printk(sys_table, "Failed to alloc lowmem for boot params\n");
 611                 return NULL;
 612         }
 613
 614         memset(boot_params, 0x0, 0x4000);
 615
 616         hdr = &boot_params->hdr;
 617         bi = &boot_params->apm_bios_info;
 618
 619         /* Copy the second sector to boot_params */
 620         memcpy(&hdr->jump, image->image_base + 512, 512);
 621
 622         /*
 623          * Fill out some of the header fields ourselves because the
 624          * EFI firmware loader doesn't load the first sector.
 625          */
 626         hdr->root_flags = 1;
 627         hdr->vid_mode = 0xffff;
 628         hdr->boot_flag = 0xAA55;
 629
 630         hdr->type_of_loader = 0x21;
 631
 632         /* Convert unicode cmdline to ascii */
 633         cmdline_ptr = efi_convert_cmdline(sys_table, image, &options_size);
 634         if (!cmdline_ptr)
 635                 goto fail;
 636         hdr->cmd_line_ptr = (unsigned long)cmdline_ptr;
 637         /* Fill in upper bits of command line address, NOP on 32 bit  */
 638         boot_params->ext_cmd_line_ptr = (u64)(unsigned long)cmdline_ptr >> 32;
 639
 640         hdr->ramdisk_image = 0;
 641         hdr->ramdisk_size = 0;
 642
 643         /* Clear APM BIOS info */
 644         memset(bi, 0, sizeof(*bi));
 645
 646         status = efi_parse_options(cmdline_ptr);
 647         if (status != EFI_SUCCESS)
 648                 goto fail2;
 649
 650         status = handle_cmdline_files(sys_table, image,
 651                                       (char *)(unsigned long)hdr->cmd_line_ptr,
 652                                       "initrd=", hdr->initrd_addr_max,
 653                                       &ramdisk_addr, &ramdisk_size);
 654
 655         if (status != EFI_SUCCESS &&
 656             hdr->xloadflags & XLF_CAN_BE_LOADED_ABOVE_4G) {
 657                 efi_printk(sys_table, "Trying to load files to higher address\n");
 658                 status = handle_cmdline_files(sys_table, image,
 659                                       (char *)(unsigned long)hdr->cmd_line_ptr,
 660                                       "initrd=", -1UL,
 661                                       &ramdisk_addr, &ramdisk_size);
 662         }
 663
 664         if (status != EFI_SUCCESS)
 665                 goto fail2;
 666         hdr->ramdisk_image = ramdisk_addr & 0xffffffff;
 667         hdr->ramdisk_size  = ramdisk_size & 0xffffffff;
 668         boot_params->ext_ramdisk_image = (u64)ramdisk_addr >> 32;
 669         boot_params->ext_ramdisk_size  = (u64)ramdisk_size >> 32;
 670
 671         return boot_params;
 672 fail2:
 673         efi_free(sys_table, options_size, hdr->cmd_line_ptr);
 674 fail:
 675         efi_free(sys_table, 0x4000, (unsigned long)boot_params);
 676         return NULL;
 677 }
 678
 679 static void add_e820ext(struct boot_params *params,
 680                         struct setup_data *e820ext, u32 nr_entries)
 681 {
 682         struct setup_data *data;
 683         efi_status_t status;
 684         unsigned long size;
 685
 686         e820ext->type = SETUP_E820_EXT;
 687         e820ext->len = nr_entries * sizeof(struct boot_e820_entry);
 688         e820ext->next = 0;
 689
 690         data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
 691
 692         while (data && data->next)
 693                 data = (struct setup_data *)(unsigned long)data->next;
 694
 695         if (data)
 696                 data->next = (unsigned long)e820ext;
 697         else
 698                 params->hdr.setup_data = (unsigned long)e820ext;
 699 }
 700
 701 static efi_status_t setup_e820(struct boot_params *params,
 702                                struct setup_data *e820ext, u32 e820ext_size)
 703 {
 704         struct boot_e820_entry *entry = params->e820_table;
 705         struct efi_info *efi = &params->efi_info;
 706         struct boot_e820_entry *prev = NULL;
 707         u32 nr_entries;
 708         u32 nr_desc;
 709         int i;
 710
 711         nr_entries = 0;
 712         nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size;
 713
 714         for (i = 0; i < nr_desc; i++) {
 715                 efi_memory_desc_t *d;
 716                 unsigned int e820_type = 0;
 717                 unsigned long m = efi->efi_memmap;
 718
 719 #ifdef CONFIG_X86_64
 720                 m |= (u64)efi->efi_memmap_hi << 32;
 721 #endif
 722
 723                 d = efi_early_memdesc_ptr(m, efi->efi_memdesc_size, i);
 724                 switch (d->type) {
 725                 case EFI_RESERVED_TYPE:
 726                 case EFI_RUNTIME_SERVICES_CODE:
 727                 case EFI_RUNTIME_SERVICES_DATA:
 728                 case EFI_MEMORY_MAPPED_IO:
 729                 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
 730                 case EFI_PAL_CODE:
 731                         e820_type = E820_TYPE_RESERVED;
 732                         break;
 733
 734                 case EFI_UNUSABLE_MEMORY:
 735                         e820_type = E820_TYPE_UNUSABLE;
 736                         break;
 737
 738                 case EFI_ACPI_RECLAIM_MEMORY:
 739                         e820_type = E820_TYPE_ACPI;
 740                         break;
 741
 742                 case EFI_LOADER_CODE:
 743                 case EFI_LOADER_DATA:
 744                 case EFI_BOOT_SERVICES_CODE:
 745                 case EFI_BOOT_SERVICES_DATA:
 746                 case EFI_CONVENTIONAL_MEMORY:
 747                         e820_type = E820_TYPE_RAM;
 748                         break;
 749
 750                 case EFI_ACPI_MEMORY_NVS:
 751                         e820_type = E820_TYPE_NVS;
 752                         break;
 753
 754                 case EFI_PERSISTENT_MEMORY:
 755                         e820_type = E820_TYPE_PMEM;
 756                         break;
 757
 758                 default:
 759                         continue;
 760                 }
 761
 762                 /* Merge adjacent mappings */
 763                 if (prev && prev->type == e820_type &&
 764                     (prev->addr + prev->size) == d->phys_addr) {
 765                         prev->size += d->num_pages << 12;
 766                         continue;
 767                 }
 768
 769                 if (nr_entries == ARRAY_SIZE(params->e820_table)) {
 770                         u32 need = (nr_desc - i) * sizeof(struct e820_entry) +
 771                                    sizeof(struct setup_data);
 772
 773                         if (!e820ext || e820ext_size < need)
 774                                 return EFI_BUFFER_TOO_SMALL;
 775
 776                         /* boot_params map full, switch to e820 extended */
 777                         entry = (struct boot_e820_entry *)e820ext->data;
 778                 }
 779
 780                 entry->addr = d->phys_addr;
 781                 entry->size = d->num_pages << PAGE_SHIFT;
 782                 entry->type = e820_type;
 783                 prev = entry++;
 784                 nr_entries++;
 785         }
 786
 787         if (nr_entries > ARRAY_SIZE(params->e820_table)) {
 788                 u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_table);
 789
 790                 add_e820ext(params, e820ext, nr_e820ext);
 791                 nr_entries -= nr_e820ext;
 792         }
 793
 794         params->e820_entries = (u8)nr_entries;
 795
 796         return EFI_SUCCESS;
 797 }
 798
 799 static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext,
 800                                   u32 *e820ext_size)
 801 {
 802         efi_status_t status;
 803         unsigned long size;
 804
 805         size = sizeof(struct setup_data) +
 806                 sizeof(struct e820_entry) * nr_desc;
 807
 808         if (*e820ext) {
 809                 efi_call_early(free_pool, *e820ext);
 810                 *e820ext = NULL;
 811                 *e820ext_size = 0;
 812         }
 813
 814         status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
 815                                 size, (void **)e820ext);
 816         if (status == EFI_SUCCESS)
 817                 *e820ext_size = size;
 818
 819         return status;
 820 }
 821
 822 struct exit_boot_struct {
 823         struct boot_params *boot_params;
 824         struct efi_info *efi;
 825         struct setup_data *e820ext;
 826         __u32 e820ext_size;
 827         bool is64;
 828 };
 829
 830 static efi_status_t exit_boot_func(efi_system_table_t *sys_table_arg,
 831                                    struct efi_boot_memmap *map,
 832                                    void *priv)
 833 {
 834         static bool first = true;
 835         const char *signature;
 836         __u32 nr_desc;
 837         efi_status_t status;
 838         struct exit_boot_struct *p = priv;
 839
 840         if (first) {
 841                 nr_desc = *map->buff_size / *map->desc_size;
 842                 if (nr_desc > ARRAY_SIZE(p->boot_params->e820_table)) {
 843                         u32 nr_e820ext = nr_desc -
 844                                         ARRAY_SIZE(p->boot_params->e820_table);
 845
 846                         status = alloc_e820ext(nr_e820ext, &p->e820ext,
 847                                                &p->e820ext_size);
 848                         if (status != EFI_SUCCESS)
 849                                 return status;
 850                 }
 851                 first = false;
 852         }
 853
 854         signature = p->is64 ? EFI64_LOADER_SIGNATURE : EFI32_LOADER_SIGNATURE;
 855         memcpy(&p->efi->efi_loader_signature, signature, sizeof(__u32));
 856
 857         p->efi->efi_systab = (unsigned long)sys_table_arg;
 858         p->efi->efi_memdesc_size = *map->desc_size;
 859         p->efi->efi_memdesc_version = *map->desc_ver;
 860         p->efi->efi_memmap = (unsigned long)*map->map;
 861         p->efi->efi_memmap_size = *map->map_size;
 862
 863 #ifdef CONFIG_X86_64
 864         p->efi->efi_systab_hi = (unsigned long)sys_table_arg >> 32;
 865         p->efi->efi_memmap_hi = (unsigned long)*map->map >> 32;
 866 #endif
 867
 868         return EFI_SUCCESS;
 869 }
 870
 871 static efi_status_t exit_boot(struct boot_params *boot_params,
 872                               void *handle, bool is64)
 873 {
 874         unsigned long map_sz, key, desc_size, buff_size;
 875         efi_memory_desc_t *mem_map;
 876         struct setup_data *e820ext;
 877         __u32 e820ext_size;
 878         efi_status_t status;
 879         __u32 desc_version;
 880         struct efi_boot_memmap map;
 881         struct exit_boot_struct priv;
 882
 883         map.map =               &mem_map;
 884         map.map_size =          &map_sz;
 885         map.desc_size =         &desc_size;
 886         map.desc_ver =          &desc_version;
 887         map.key_ptr =           &key;
 888         map.buff_size =         &buff_size;
 889         priv.boot_params =      boot_params;
 890         priv.efi =              &boot_params->efi_info;
 891         priv.e820ext =          NULL;
 892         priv.e820ext_size =     0;
 893         priv.is64 =             is64;
 894
 895         /* Might as well exit boot services now */
 896         status = efi_exit_boot_services(sys_table, handle, &map, &priv,
 897                                         exit_boot_func);
 898         if (status != EFI_SUCCESS)
 899                 return status;
 900
 901         e820ext = priv.e820ext;
 902         e820ext_size = priv.e820ext_size;
 903         /* Historic? */
 904         boot_params->alt_mem_k = 32 * 1024;
 905
 906         status = setup_e820(boot_params, e820ext, e820ext_size);
 907         if (status != EFI_SUCCESS)
 908                 return status;
 909
 910         return EFI_SUCCESS;
 911 }
 912
 913 /*
 914  * On success we return a pointer to a boot_params structure, and NULL
 915  * on failure.
 916  */
 917 struct boot_params *efi_main(struct efi_config *c,
 918                              struct boot_params *boot_params)
 919 {
 920         struct desc_ptr *gdt = NULL;
 921         efi_loaded_image_t *image;
 922         struct setup_header *hdr = &boot_params->hdr;
 923         efi_status_t status;
 924         struct desc_struct *desc;
 925         void *handle;
 926         efi_system_table_t *_table;
 927         bool is64;
 928
 929         efi_early = c;
 930
 931         _table = (efi_system_table_t *)(unsigned long)efi_early->table;
 932         handle = (void *)(unsigned long)efi_early->image_handle;
 933         is64 = efi_early->is64;
 934
 935         sys_table = _table;
 936
 937         /* Check if we were booted by the EFI firmware */
 938         if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 939                 goto fail;
 940
 941         if (is64)
 942                 setup_boot_services64(efi_early);
 943         else
 944                 setup_boot_services32(efi_early);
 945
 946         /*
 947          * If the boot loader gave us a value for secure_boot then we use that,
 948          * otherwise we ask the BIOS.
 949          */
 950         if (boot_params->secure_boot == efi_secureboot_mode_unset)
 951                 boot_params->secure_boot = efi_get_secureboot(sys_table);
 952
 953         /* Ask the firmware to clear memory on unclean shutdown */
 954         efi_enable_reset_attack_mitigation(sys_table);
 955         efi_retrieve_tpm2_eventlog(sys_table);
 956
 957         setup_graphics(boot_params);
 958
 959         setup_efi_pci(boot_params);
 960
 961         setup_quirks(boot_params);
 962
 963         status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
 964                                 sizeof(*gdt), (void **)&gdt);
 965         if (status != EFI_SUCCESS) {
 966                 efi_printk(sys_table, "Failed to alloc mem for gdt structure\n");
 967                 goto fail;
 968         }
 969
 970         gdt->size = 0x800;
 971         status = efi_low_alloc(sys_table, gdt->size, 8,
 972                            (unsigned long *)&gdt->address);
 973         if (status != EFI_SUCCESS) {
 974                 efi_printk(sys_table, "Failed to alloc mem for gdt\n");
 975                 goto fail;
 976         }
 977
 978         /*
 979          * If the kernel isn't already loaded at the preferred load
 980          * address, relocate it.
 981          */
 982         if (hdr->pref_address != hdr->code32_start) {
 983                 unsigned long bzimage_addr = hdr->code32_start;
 984                 status = efi_relocate_kernel(sys_table, &bzimage_addr,
 985                                              hdr->init_size, hdr->init_size,
 986                                              hdr->pref_address,
 987                                              hdr->kernel_alignment);
 988                 if (status != EFI_SUCCESS) {
 989                         efi_printk(sys_table, "efi_relocate_kernel() failed!\n");
 990                         goto fail;
 991                 }
 992
 993                 hdr->pref_address = hdr->code32_start;
 994                 hdr->code32_start = bzimage_addr;
 995         }
 996
 997         status = exit_boot(boot_params, handle, is64);
 998         if (status != EFI_SUCCESS) {
 999                 efi_printk(sys_table, "exit_boot() failed!\n");
1000                 goto fail;
1001         }
1002
1003         memset((char *)gdt->address, 0x0, gdt->size);
1004         desc = (struct desc_struct *)gdt->address;
1005
1006         /* The first GDT is a dummy. */
1007         desc++;
1008
1009         if (IS_ENABLED(CONFIG_X86_64)) {
1010                 /* __KERNEL32_CS */
1011                 desc->limit0 = 0xffff;
1012                 desc->base0 = 0x0000;
1013                 desc->base1 = 0x0000;
1014                 desc->type = SEG_TYPE_CODE | SEG_TYPE_EXEC_READ;
1015                 desc->s = DESC_TYPE_CODE_DATA;
1016                 desc->dpl = 0;
1017                 desc->p = 1;
1018                 desc->limit1 = 0xf;
1019                 desc->avl = 0;
1020                 desc->l = 0;
1021                 desc->d = SEG_OP_SIZE_32BIT;
1022                 desc->g = SEG_GRANULARITY_4KB;
1023                 desc->base2 = 0x00;
1024                 desc++;
1025         } else {
1026                 /* Second entry is unused on 32-bit */
1027                 desc++;
1028         }
1029
1030         /* __KERNEL_CS */
1031         desc->limit0 = 0xffff;
1032         desc->base0 = 0x0000;
1033         desc->base1 = 0x0000;
1034         desc->type = SEG_TYPE_CODE | SEG_TYPE_EXEC_READ;
1035         desc->s = DESC_TYPE_CODE_DATA;
1036         desc->dpl = 0;
1037         desc->p = 1;
1038         desc->limit1 = 0xf;
1039         desc->avl = 0;
1040         if (IS_ENABLED(CONFIG_X86_64)) {
1041                 desc->l = 1;
1042                 desc->d = 0;
1043         } else {
1044                 desc->l = 0;
1045                 desc->d = SEG_OP_SIZE_32BIT;
1046         }
1047         desc->g = SEG_GRANULARITY_4KB;
1048         desc->base2 = 0x00;
1049         desc++;
1050
1051         /* __KERNEL_DS */
1052         desc->limit0 = 0xffff;
1053         desc->base0 = 0x0000;
1054         desc->base1 = 0x0000;
1055         desc->type = SEG_TYPE_DATA | SEG_TYPE_READ_WRITE;
1056         desc->s = DESC_TYPE_CODE_DATA;
1057         desc->dpl = 0;
1058         desc->p = 1;
1059         desc->limit1 = 0xf;
1060         desc->avl = 0;
1061         desc->l = 0;
1062         desc->d = SEG_OP_SIZE_32BIT;
1063         desc->g = SEG_GRANULARITY_4KB;
1064         desc->base2 = 0x00;
1065         desc++;
1066
1067         if (IS_ENABLED(CONFIG_X86_64)) {
1068                 /* Task segment value */
1069                 desc->limit0 = 0x0000;
1070                 desc->base0 = 0x0000;
1071                 desc->base1 = 0x0000;
1072                 desc->type = SEG_TYPE_TSS;
1073                 desc->s = 0;
1074                 desc->dpl = 0;
1075                 desc->p = 1;
1076                 desc->limit1 = 0x0;
1077                 desc->avl = 0;
1078                 desc->l = 0;
1079                 desc->d = 0;
1080                 desc->g = SEG_GRANULARITY_4KB;
1081                 desc->base2 = 0x00;
1082                 desc++;
1083         }
1084
1085         asm volatile("cli");
1086         asm volatile ("lgdt %0" : : "m" (*gdt));
1087
1088         return boot_params;
1089 fail:
1090         efi_printk(sys_table, "efi_main() failed!\n");
1091         return NULL;
1092 }