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