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