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_pci32(efi_pci_io_protocol_32 *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;
 118
 119         status = efi_early->call(pci->attributes, pci,
 120                                  EfiPciIoAttributeOperationGet, 0, 0,
 121                                  &attributes);
 122         if (status != EFI_SUCCESS)
 123                 return status;
 124
 125         if (!pci->romimage || !pci->romsize)
 126                 return EFI_INVALID_PARAMETER;
 127
 128         size = pci->romsize + sizeof(*rom);
 129
 130         status = efi_call_early(allocate_pool, EFI_LOADER_DATA, size, &rom);
 131         if (status != EFI_SUCCESS) {
 132                 efi_printk(sys_table, "Failed to alloc mem for rom\n");
 133                 return status;
 134         }
 135
 136         memset(rom, 0, sizeof(*rom));
 137
 138         rom->data.type = SETUP_PCI;
 139         rom->data.len = size - sizeof(struct setup_data);
 140         rom->data.next = 0;
 141         rom->pcilen = pci->romsize;
 142         *__rom = rom;
 143
 144         status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
 145                                  PCI_VENDOR_ID, 1, &(rom->vendor));
 146
 147         if (status != EFI_SUCCESS) {
 148                 efi_printk(sys_table, "Failed to read rom->vendor\n");
 149                 goto free_struct;
 150         }
 151
 152         status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
 153                                  PCI_DEVICE_ID, 1, &(rom->devid));
 154
 155         if (status != EFI_SUCCESS) {
 156                 efi_printk(sys_table, "Failed to read rom->devid\n");
 157                 goto free_struct;
 158         }
 159
 160         status = efi_early->call(pci->get_location, pci, &(rom->segment),
 161                                  &(rom->bus), &(rom->device), &(rom->function));
 162
 163         if (status != EFI_SUCCESS)
 164                 goto free_struct;
 165
 166         memcpy(rom->romdata, pci->romimage, pci->romsize);
 167         return status;
 168
 169 free_struct:
 170         efi_call_early(free_pool, rom);
 171         return status;
 172 }
 173
 174 static void
 175 setup_efi_pci32(struct boot_params *params, void **pci_handle,
 176                 unsigned long size)
 177 {
 178         efi_pci_io_protocol_32 *pci = NULL;
 179         efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
 180         u32 *handles = (u32 *)(unsigned long)pci_handle;
 181         efi_status_t status;
 182         unsigned long nr_pci;
 183         struct setup_data *data;
 184         int i;
 185
 186         data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
 187
 188         while (data && data->next)
 189                 data = (struct setup_data *)(unsigned long)data->next;
 190
 191         nr_pci = size / sizeof(u32);
 192         for (i = 0; i < nr_pci; i++) {
 193                 struct pci_setup_rom *rom = NULL;
 194                 u32 h = handles[i];
 195
 196                 status = efi_call_early(handle_protocol, h,
 197                                         &pci_proto, (void **)&pci);
 198
 199                 if (status != EFI_SUCCESS)
 200                         continue;
 201
 202                 if (!pci)
 203                         continue;
 204
 205                 status = __setup_efi_pci32(pci, &rom);
 206                 if (status != EFI_SUCCESS)
 207                         continue;
 208
 209                 if (data)
 210                         data->next = (unsigned long)rom;
 211                 else
 212                         params->hdr.setup_data = (unsigned long)rom;
 213
 214                 data = (struct setup_data *)rom;
 215
 216         }
 217 }
 218
 219 static efi_status_t
 220 __setup_efi_pci64(efi_pci_io_protocol_64 *pci, struct pci_setup_rom **__rom)
 221 {
 222         struct pci_setup_rom *rom;
 223         efi_status_t status;
 224         unsigned long size;
 225         uint64_t attributes;
 226
 227         status = efi_early->call(pci->attributes, pci,
 228                                  EfiPciIoAttributeOperationGet, 0,
 229                                  &attributes);
 230         if (status != EFI_SUCCESS)
 231                 return status;
 232
 233         if (!pci->romimage || !pci->romsize)
 234                 return EFI_INVALID_PARAMETER;
 235
 236         size = pci->romsize + sizeof(*rom);
 237
 238         status = efi_call_early(allocate_pool, EFI_LOADER_DATA, size, &rom);
 239         if (status != EFI_SUCCESS) {
 240                 efi_printk(sys_table, "Failed to alloc mem for rom\n");
 241                 return status;
 242         }
 243
 244         rom->data.type = SETUP_PCI;
 245         rom->data.len = size - sizeof(struct setup_data);
 246         rom->data.next = 0;
 247         rom->pcilen = pci->romsize;
 248         *__rom = rom;
 249
 250         status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
 251                                  PCI_VENDOR_ID, 1, &(rom->vendor));
 252
 253         if (status != EFI_SUCCESS) {
 254                 efi_printk(sys_table, "Failed to read rom->vendor\n");
 255                 goto free_struct;
 256         }
 257
 258         status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
 259                                  PCI_DEVICE_ID, 1, &(rom->devid));
 260
 261         if (status != EFI_SUCCESS) {
 262                 efi_printk(sys_table, "Failed to read rom->devid\n");
 263                 goto free_struct;
 264         }
 265
 266         status = efi_early->call(pci->get_location, pci, &(rom->segment),
 267                                  &(rom->bus), &(rom->device), &(rom->function));
 268
 269         if (status != EFI_SUCCESS)
 270                 goto free_struct;
 271
 272         memcpy(rom->romdata, pci->romimage, pci->romsize);
 273         return status;
 274
 275 free_struct:
 276         efi_call_early(free_pool, rom);
 277         return status;
 278
 279 }
 280
 281 static void
 282 setup_efi_pci64(struct boot_params *params, void **pci_handle,
 283                 unsigned long size)
 284 {
 285         efi_pci_io_protocol_64 *pci = NULL;
 286         efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
 287         u64 *handles = (u64 *)(unsigned long)pci_handle;
 288         efi_status_t status;
 289         unsigned long nr_pci;
 290         struct setup_data *data;
 291         int i;
 292
 293         data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
 294
 295         while (data && data->next)
 296                 data = (struct setup_data *)(unsigned long)data->next;
 297
 298         nr_pci = size / sizeof(u64);
 299         for (i = 0; i < nr_pci; i++) {
 300                 struct pci_setup_rom *rom = NULL;
 301                 u64 h = handles[i];
 302
 303                 status = efi_call_early(handle_protocol, h,
 304                                         &pci_proto, (void **)&pci);
 305
 306                 if (status != EFI_SUCCESS)
 307                         continue;
 308
 309                 if (!pci)
 310                         continue;
 311
 312                 status = __setup_efi_pci64(pci, &rom);
 313                 if (status != EFI_SUCCESS)
 314                         continue;
 315
 316                 if (data)
 317                         data->next = (unsigned long)rom;
 318                 else
 319                         params->hdr.setup_data = (unsigned long)rom;
 320
 321                 data = (struct setup_data *)rom;
 322
 323         }
 324 }
 325
 326 /*
 327  * There's no way to return an informative status from this function,
 328  * because any analysis (and printing of error messages) needs to be
 329  * done directly at the EFI function call-site.
 330  *
 331  * For example, EFI_INVALID_PARAMETER could indicate a bug or maybe we
 332  * just didn't find any PCI devices, but there's no way to tell outside
 333  * the context of the call.
 334  */
 335 static void setup_efi_pci(struct boot_params *params)
 336 {
 337         efi_status_t status;
 338         void **pci_handle = NULL;
 339         efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
 340         unsigned long size = 0;
 341
 342         status = efi_call_early(locate_handle,
 343                                 EFI_LOCATE_BY_PROTOCOL,
 344                                 &pci_proto, NULL, &size, pci_handle);
 345
 346         if (status == EFI_BUFFER_TOO_SMALL) {
 347                 status = efi_call_early(allocate_pool,
 348                                         EFI_LOADER_DATA,
 349                                         size, (void **)&pci_handle);
 350
 351                 if (status != EFI_SUCCESS) {
 352                         efi_printk(sys_table, "Failed to alloc mem for pci_handle\n");
 353                         return;
 354                 }
 355
 356                 status = efi_call_early(locate_handle,
 357                                         EFI_LOCATE_BY_PROTOCOL, &pci_proto,
 358                                         NULL, &size, pci_handle);
 359         }
 360
 361         if (status != EFI_SUCCESS)
 362                 goto free_handle;
 363
 364         if (efi_early->is64)
 365                 setup_efi_pci64(params, pci_handle, size);
 366         else
 367                 setup_efi_pci32(params, pci_handle, size);
 368
 369 free_handle:
 370         efi_call_early(free_pool, pci_handle);
 371 }
 372
 373 static void retrieve_apple_device_properties(struct boot_params *boot_params)
 374 {
 375         efi_guid_t guid = APPLE_PROPERTIES_PROTOCOL_GUID;
 376         struct setup_data *data, *new;
 377         efi_status_t status;
 378         u32 size = 0;
 379         void *p;
 380
 381         status = efi_call_early(locate_protocol, &guid, NULL, &p);
 382         if (status != EFI_SUCCESS)
 383                 return;
 384
 385         if (efi_table_attr(apple_properties_protocol, version, p) != 0x10000) {
 386                 efi_printk(sys_table, "Unsupported properties proto version\n");
 387                 return;
 388         }
 389
 390         efi_call_proto(apple_properties_protocol, get_all, p, NULL, &size);
 391         if (!size)
 392                 return;
 393
 394         do {
 395                 status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
 396                                         size + sizeof(struct setup_data), &new);
 397                 if (status != EFI_SUCCESS) {
 398                         efi_printk(sys_table,
 399                                         "Failed to alloc mem for properties\n");
 400                         return;
 401                 }
 402
 403                 status = efi_call_proto(apple_properties_protocol, get_all, p,
 404                                         new->data, &size);
 405
 406                 if (status == EFI_BUFFER_TOO_SMALL)
 407                         efi_call_early(free_pool, new);
 408         } while (status == EFI_BUFFER_TOO_SMALL);
 409
 410         new->type = SETUP_APPLE_PROPERTIES;
 411         new->len  = size;
 412         new->next = 0;
 413
 414         data = (struct setup_data *)(unsigned long)boot_params->hdr.setup_data;
 415         if (!data)
 416                 boot_params->hdr.setup_data = (unsigned long)new;
 417         else {
 418                 while (data->next)
 419                         data = (struct setup_data *)(unsigned long)data->next;
 420                 data->next = (unsigned long)new;
 421         }
 422 }
 423
 424 static void setup_quirks(struct boot_params *boot_params)
 425 {
 426         efi_char16_t const apple[] = { 'A', 'p', 'p', 'l', 'e', 0 };
 427         efi_char16_t *fw_vendor = (efi_char16_t *)(unsigned long)
 428                 efi_table_attr(efi_system_table, fw_vendor, sys_table);
 429
 430         if (!memcmp(fw_vendor, apple, sizeof(apple))) {
 431                 if (IS_ENABLED(CONFIG_APPLE_PROPERTIES))
 432                         retrieve_apple_device_properties(boot_params);
 433         }
 434 }
 435
 436 static efi_status_t
 437 setup_uga32(void **uga_handle, unsigned long size, u32 *width, u32 *height)
 438 {
 439         struct efi_uga_draw_protocol *uga = NULL, *first_uga;
 440         efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
 441         unsigned long nr_ugas;
 442         u32 *handles = (u32 *)uga_handle;;
 443         efi_status_t status = EFI_INVALID_PARAMETER;
 444         int i;
 445
 446         first_uga = NULL;
 447         nr_ugas = size / sizeof(u32);
 448         for (i = 0; i < nr_ugas; i++) {
 449                 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
 450                 u32 w, h, depth, refresh;
 451                 void *pciio;
 452                 u32 handle = handles[i];
 453
 454                 status = efi_call_early(handle_protocol, handle,
 455                                         &uga_proto, (void **)&uga);
 456                 if (status != EFI_SUCCESS)
 457                         continue;
 458
 459                 efi_call_early(handle_protocol, handle, &pciio_proto, &pciio);
 460
 461                 status = efi_early->call((unsigned long)uga->get_mode, uga,
 462                                          &w, &h, &depth, &refresh);
 463                 if (status == EFI_SUCCESS && (!first_uga || pciio)) {
 464                         *width = w;
 465                         *height = h;
 466
 467                         /*
 468                          * Once we've found a UGA supporting PCIIO,
 469                          * don't bother looking any further.
 470                          */
 471                         if (pciio)
 472                                 break;
 473
 474                         first_uga = uga;
 475                 }
 476         }
 477
 478         return status;
 479 }
 480
 481 static efi_status_t
 482 setup_uga64(void **uga_handle, unsigned long size, u32 *width, u32 *height)
 483 {
 484         struct efi_uga_draw_protocol *uga = NULL, *first_uga;
 485         efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
 486         unsigned long nr_ugas;
 487         u64 *handles = (u64 *)uga_handle;;
 488         efi_status_t status = EFI_INVALID_PARAMETER;
 489         int i;
 490
 491         first_uga = NULL;
 492         nr_ugas = size / sizeof(u64);
 493         for (i = 0; i < nr_ugas; i++) {
 494                 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
 495                 u32 w, h, depth, refresh;
 496                 void *pciio;
 497                 u64 handle = handles[i];
 498
 499                 status = efi_call_early(handle_protocol, handle,
 500                                         &uga_proto, (void **)&uga);
 501                 if (status != EFI_SUCCESS)
 502                         continue;
 503
 504                 efi_call_early(handle_protocol, handle, &pciio_proto, &pciio);
 505
 506                 status = efi_early->call((unsigned long)uga->get_mode, uga,
 507                                          &w, &h, &depth, &refresh);
 508                 if (status == EFI_SUCCESS && (!first_uga || pciio)) {
 509                         *width = w;
 510                         *height = h;
 511
 512                         /*
 513                          * Once we've found a UGA supporting PCIIO,
 514                          * don't bother looking any further.
 515                          */
 516                         if (pciio)
 517                                 break;
 518
 519                         first_uga = uga;
 520                 }
 521         }
 522
 523         return status;
 524 }
 525
 526 /*
 527  * See if we have Universal Graphics Adapter (UGA) protocol
 528  */
 529 static efi_status_t setup_uga(struct screen_info *si, efi_guid_t *uga_proto,
 530                               unsigned long size)
 531 {
 532         efi_status_t status;
 533         u32 width, height;
 534         void **uga_handle = NULL;
 535
 536         status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
 537                                 size, (void **)&uga_handle);
 538         if (status != EFI_SUCCESS)
 539                 return status;
 540
 541         status = efi_call_early(locate_handle,
 542                                 EFI_LOCATE_BY_PROTOCOL,
 543                                 uga_proto, NULL, &size, uga_handle);
 544         if (status != EFI_SUCCESS)
 545                 goto free_handle;
 546
 547         height = 0;
 548         width = 0;
 549
 550         if (efi_early->is64)
 551                 status = setup_uga64(uga_handle, size, &width, &height);
 552         else
 553                 status = setup_uga32(uga_handle, size, &width, &height);
 554
 555         if (!width && !height)
 556                 goto free_handle;
 557
 558         /* EFI framebuffer */
 559         si->orig_video_isVGA = VIDEO_TYPE_EFI;
 560
 561         si->lfb_depth = 32;
 562         si->lfb_width = width;
 563         si->lfb_height = height;
 564
 565         si->red_size = 8;
 566         si->red_pos = 16;
 567         si->green_size = 8;
 568         si->green_pos = 8;
 569         si->blue_size = 8;
 570         si->blue_pos = 0;
 571         si->rsvd_size = 8;
 572         si->rsvd_pos = 24;
 573
 574 free_handle:
 575         efi_call_early(free_pool, uga_handle);
 576         return status;
 577 }
 578
 579 void setup_graphics(struct boot_params *boot_params)
 580 {
 581         efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
 582         struct screen_info *si;
 583         efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
 584         efi_status_t status;
 585         unsigned long size;
 586         void **gop_handle = NULL;
 587         void **uga_handle = NULL;
 588
 589         si = &boot_params->screen_info;
 590         memset(si, 0, sizeof(*si));
 591
 592         size = 0;
 593         status = efi_call_early(locate_handle,
 594                                 EFI_LOCATE_BY_PROTOCOL,
 595                                 &graphics_proto, NULL, &size, gop_handle);
 596         if (status == EFI_BUFFER_TOO_SMALL)
 597                 status = efi_setup_gop(NULL, si, &graphics_proto, size);
 598
 599         if (status != EFI_SUCCESS) {
 600                 size = 0;
 601                 status = efi_call_early(locate_handle,
 602                                         EFI_LOCATE_BY_PROTOCOL,
 603                                         &uga_proto, NULL, &size, uga_handle);
 604                 if (status == EFI_BUFFER_TOO_SMALL)
 605                         setup_uga(si, &uga_proto, size);
 606         }
 607 }
 608
 609 /*
 610  * Because the x86 boot code expects to be passed a boot_params we
 611  * need to create one ourselves (usually the bootloader would create
 612  * one for us).
 613  *
 614  * The caller is responsible for filling out ->code32_start in the
 615  * returned boot_params.
 616  */
 617 struct boot_params *make_boot_params(struct efi_config *c)
 618 {
 619         struct boot_params *boot_params;
 620         struct apm_bios_info *bi;
 621         struct setup_header *hdr;
 622         efi_loaded_image_t *image;
 623         void *options, *handle;
 624         efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
 625         int options_size = 0;
 626         efi_status_t status;
 627         char *cmdline_ptr;
 628         u16 *s2;
 629         u8 *s1;
 630         int i;
 631         unsigned long ramdisk_addr;
 632         unsigned long ramdisk_size;
 633
 634         efi_early = c;
 635         sys_table = (efi_system_table_t *)(unsigned long)efi_early->table;
 636         handle = (void *)(unsigned long)efi_early->image_handle;
 637
 638         /* Check if we were booted by the EFI firmware */
 639         if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 640                 return NULL;
 641
 642         if (efi_early->is64)
 643                 setup_boot_services64(efi_early);
 644         else
 645                 setup_boot_services32(efi_early);
 646
 647         status = efi_call_early(handle_protocol, handle,
 648                                 &proto, (void *)&image);
 649         if (status != EFI_SUCCESS) {
 650                 efi_printk(sys_table, "Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
 651                 return NULL;
 652         }
 653
 654         status = efi_low_alloc(sys_table, 0x4000, 1,
 655                                (unsigned long *)&boot_params);
 656         if (status != EFI_SUCCESS) {
 657                 efi_printk(sys_table, "Failed to alloc lowmem for boot params\n");
 658                 return NULL;
 659         }
 660
 661         memset(boot_params, 0x0, 0x4000);
 662
 663         hdr = &boot_params->hdr;
 664         bi = &boot_params->apm_bios_info;
 665
 666         /* Copy the second sector to boot_params */
 667         memcpy(&hdr->jump, image->image_base + 512, 512);
 668
 669         /*
 670          * Fill out some of the header fields ourselves because the
 671          * EFI firmware loader doesn't load the first sector.
 672          */
 673         hdr->root_flags = 1;
 674         hdr->vid_mode = 0xffff;
 675         hdr->boot_flag = 0xAA55;
 676
 677         hdr->type_of_loader = 0x21;
 678
 679         /* Convert unicode cmdline to ascii */
 680         cmdline_ptr = efi_convert_cmdline(sys_table, image, &options_size);
 681         if (!cmdline_ptr)
 682                 goto fail;
 683         hdr->cmd_line_ptr = (unsigned long)cmdline_ptr;
 684         /* Fill in upper bits of command line address, NOP on 32 bit  */
 685         boot_params->ext_cmd_line_ptr = (u64)(unsigned long)cmdline_ptr >> 32;
 686
 687         hdr->ramdisk_image = 0;
 688         hdr->ramdisk_size = 0;
 689
 690         /* Clear APM BIOS info */
 691         memset(bi, 0, sizeof(*bi));
 692
 693         status = efi_parse_options(cmdline_ptr);
 694         if (status != EFI_SUCCESS)
 695                 goto fail2;
 696
 697         status = handle_cmdline_files(sys_table, image,
 698                                       (char *)(unsigned long)hdr->cmd_line_ptr,
 699                                       "initrd=", hdr->initrd_addr_max,
 700                                       &ramdisk_addr, &ramdisk_size);
 701
 702         if (status != EFI_SUCCESS &&
 703             hdr->xloadflags & XLF_CAN_BE_LOADED_ABOVE_4G) {
 704                 efi_printk(sys_table, "Trying to load files to higher address\n");
 705                 status = handle_cmdline_files(sys_table, image,
 706                                       (char *)(unsigned long)hdr->cmd_line_ptr,
 707                                       "initrd=", -1UL,
 708                                       &ramdisk_addr, &ramdisk_size);
 709         }
 710
 711         if (status != EFI_SUCCESS)
 712                 goto fail2;
 713         hdr->ramdisk_image = ramdisk_addr & 0xffffffff;
 714         hdr->ramdisk_size  = ramdisk_size & 0xffffffff;
 715         boot_params->ext_ramdisk_image = (u64)ramdisk_addr >> 32;
 716         boot_params->ext_ramdisk_size  = (u64)ramdisk_size >> 32;
 717
 718         return boot_params;
 719 fail2:
 720         efi_free(sys_table, options_size, hdr->cmd_line_ptr);
 721 fail:
 722         efi_free(sys_table, 0x4000, (unsigned long)boot_params);
 723         return NULL;
 724 }
 725
 726 static void add_e820ext(struct boot_params *params,
 727                         struct setup_data *e820ext, u32 nr_entries)
 728 {
 729         struct setup_data *data;
 730         efi_status_t status;
 731         unsigned long size;
 732
 733         e820ext->type = SETUP_E820_EXT;
 734         e820ext->len = nr_entries * sizeof(struct boot_e820_entry);
 735         e820ext->next = 0;
 736
 737         data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
 738
 739         while (data && data->next)
 740                 data = (struct setup_data *)(unsigned long)data->next;
 741
 742         if (data)
 743                 data->next = (unsigned long)e820ext;
 744         else
 745                 params->hdr.setup_data = (unsigned long)e820ext;
 746 }
 747
 748 static efi_status_t setup_e820(struct boot_params *params,
 749                                struct setup_data *e820ext, u32 e820ext_size)
 750 {
 751         struct boot_e820_entry *entry = params->e820_table;
 752         struct efi_info *efi = &params->efi_info;
 753         struct boot_e820_entry *prev = NULL;
 754         u32 nr_entries;
 755         u32 nr_desc;
 756         int i;
 757
 758         nr_entries = 0;
 759         nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size;
 760
 761         for (i = 0; i < nr_desc; i++) {
 762                 efi_memory_desc_t *d;
 763                 unsigned int e820_type = 0;
 764                 unsigned long m = efi->efi_memmap;
 765
 766 #ifdef CONFIG_X86_64
 767                 m |= (u64)efi->efi_memmap_hi << 32;
 768 #endif
 769
 770                 d = efi_early_memdesc_ptr(m, efi->efi_memdesc_size, i);
 771                 switch (d->type) {
 772                 case EFI_RESERVED_TYPE:
 773                 case EFI_RUNTIME_SERVICES_CODE:
 774                 case EFI_RUNTIME_SERVICES_DATA:
 775                 case EFI_MEMORY_MAPPED_IO:
 776                 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
 777                 case EFI_PAL_CODE:
 778                         e820_type = E820_TYPE_RESERVED;
 779                         break;
 780
 781                 case EFI_UNUSABLE_MEMORY:
 782                         e820_type = E820_TYPE_UNUSABLE;
 783                         break;
 784
 785                 case EFI_ACPI_RECLAIM_MEMORY:
 786                         e820_type = E820_TYPE_ACPI;
 787                         break;
 788
 789                 case EFI_LOADER_CODE:
 790                 case EFI_LOADER_DATA:
 791                 case EFI_BOOT_SERVICES_CODE:
 792                 case EFI_BOOT_SERVICES_DATA:
 793                 case EFI_CONVENTIONAL_MEMORY:
 794                         e820_type = E820_TYPE_RAM;
 795                         break;
 796
 797                 case EFI_ACPI_MEMORY_NVS:
 798                         e820_type = E820_TYPE_NVS;
 799                         break;
 800
 801                 case EFI_PERSISTENT_MEMORY:
 802                         e820_type = E820_TYPE_PMEM;
 803                         break;
 804
 805                 default:
 806                         continue;
 807                 }
 808
 809                 /* Merge adjacent mappings */
 810                 if (prev && prev->type == e820_type &&
 811                     (prev->addr + prev->size) == d->phys_addr) {
 812                         prev->size += d->num_pages << 12;
 813                         continue;
 814                 }
 815
 816                 if (nr_entries == ARRAY_SIZE(params->e820_table)) {
 817                         u32 need = (nr_desc - i) * sizeof(struct e820_entry) +
 818                                    sizeof(struct setup_data);
 819
 820                         if (!e820ext || e820ext_size < need)
 821                                 return EFI_BUFFER_TOO_SMALL;
 822
 823                         /* boot_params map full, switch to e820 extended */
 824                         entry = (struct boot_e820_entry *)e820ext->data;
 825                 }
 826
 827                 entry->addr = d->phys_addr;
 828                 entry->size = d->num_pages << PAGE_SHIFT;
 829                 entry->type = e820_type;
 830                 prev = entry++;
 831                 nr_entries++;
 832         }
 833
 834         if (nr_entries > ARRAY_SIZE(params->e820_table)) {
 835                 u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_table);
 836
 837                 add_e820ext(params, e820ext, nr_e820ext);
 838                 nr_entries -= nr_e820ext;
 839         }
 840
 841         params->e820_entries = (u8)nr_entries;
 842
 843         return EFI_SUCCESS;
 844 }
 845
 846 static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext,
 847                                   u32 *e820ext_size)
 848 {
 849         efi_status_t status;
 850         unsigned long size;
 851
 852         size = sizeof(struct setup_data) +
 853                 sizeof(struct e820_entry) * nr_desc;
 854
 855         if (*e820ext) {
 856                 efi_call_early(free_pool, *e820ext);
 857                 *e820ext = NULL;
 858                 *e820ext_size = 0;
 859         }
 860
 861         status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
 862                                 size, (void **)e820ext);
 863         if (status == EFI_SUCCESS)
 864                 *e820ext_size = size;
 865
 866         return status;
 867 }
 868
 869 struct exit_boot_struct {
 870         struct boot_params *boot_params;
 871         struct efi_info *efi;
 872         struct setup_data *e820ext;
 873         __u32 e820ext_size;
 874         bool is64;
 875 };
 876
 877 static efi_status_t exit_boot_func(efi_system_table_t *sys_table_arg,
 878                                    struct efi_boot_memmap *map,
 879                                    void *priv)
 880 {
 881         static bool first = true;
 882         const char *signature;
 883         __u32 nr_desc;
 884         efi_status_t status;
 885         struct exit_boot_struct *p = priv;
 886
 887         if (first) {
 888                 nr_desc = *map->buff_size / *map->desc_size;
 889                 if (nr_desc > ARRAY_SIZE(p->boot_params->e820_table)) {
 890                         u32 nr_e820ext = nr_desc -
 891                                         ARRAY_SIZE(p->boot_params->e820_table);
 892
 893                         status = alloc_e820ext(nr_e820ext, &p->e820ext,
 894                                                &p->e820ext_size);
 895                         if (status != EFI_SUCCESS)
 896                                 return status;
 897                 }
 898                 first = false;
 899         }
 900
 901         signature = p->is64 ? EFI64_LOADER_SIGNATURE : EFI32_LOADER_SIGNATURE;
 902         memcpy(&p->efi->efi_loader_signature, signature, sizeof(__u32));
 903
 904         p->efi->efi_systab = (unsigned long)sys_table_arg;
 905         p->efi->efi_memdesc_size = *map->desc_size;
 906         p->efi->efi_memdesc_version = *map->desc_ver;
 907         p->efi->efi_memmap = (unsigned long)*map->map;
 908         p->efi->efi_memmap_size = *map->map_size;
 909
 910 #ifdef CONFIG_X86_64
 911         p->efi->efi_systab_hi = (unsigned long)sys_table_arg >> 32;
 912         p->efi->efi_memmap_hi = (unsigned long)*map->map >> 32;
 913 #endif
 914
 915         return EFI_SUCCESS;
 916 }
 917
 918 static efi_status_t exit_boot(struct boot_params *boot_params,
 919                               void *handle, bool is64)
 920 {
 921         unsigned long map_sz, key, desc_size, buff_size;
 922         efi_memory_desc_t *mem_map;
 923         struct setup_data *e820ext;
 924         __u32 e820ext_size;
 925         efi_status_t status;
 926         __u32 desc_version;
 927         struct efi_boot_memmap map;
 928         struct exit_boot_struct priv;
 929
 930         map.map =               &mem_map;
 931         map.map_size =          &map_sz;
 932         map.desc_size =         &desc_size;
 933         map.desc_ver =          &desc_version;
 934         map.key_ptr =           &key;
 935         map.buff_size =         &buff_size;
 936         priv.boot_params =      boot_params;
 937         priv.efi =              &boot_params->efi_info;
 938         priv.e820ext =          NULL;
 939         priv.e820ext_size =     0;
 940         priv.is64 =             is64;
 941
 942         /* Might as well exit boot services now */
 943         status = efi_exit_boot_services(sys_table, handle, &map, &priv,
 944                                         exit_boot_func);
 945         if (status != EFI_SUCCESS)
 946                 return status;
 947
 948         e820ext = priv.e820ext;
 949         e820ext_size = priv.e820ext_size;
 950         /* Historic? */
 951         boot_params->alt_mem_k = 32 * 1024;
 952
 953         status = setup_e820(boot_params, e820ext, e820ext_size);
 954         if (status != EFI_SUCCESS)
 955                 return status;
 956
 957         return EFI_SUCCESS;
 958 }
 959
 960 /*
 961  * On success we return a pointer to a boot_params structure, and NULL
 962  * on failure.
 963  */
 964 struct boot_params *efi_main(struct efi_config *c,
 965                              struct boot_params *boot_params)
 966 {
 967         struct desc_ptr *gdt = NULL;
 968         efi_loaded_image_t *image;
 969         struct setup_header *hdr = &boot_params->hdr;
 970         efi_status_t status;
 971         struct desc_struct *desc;
 972         void *handle;
 973         efi_system_table_t *_table;
 974         bool is64;
 975
 976         efi_early = c;
 977
 978         _table = (efi_system_table_t *)(unsigned long)efi_early->table;
 979         handle = (void *)(unsigned long)efi_early->image_handle;
 980         is64 = efi_early->is64;
 981
 982         sys_table = _table;
 983
 984         /* Check if we were booted by the EFI firmware */
 985         if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 986                 goto fail;
 987
 988         if (is64)
 989                 setup_boot_services64(efi_early);
 990         else
 991                 setup_boot_services32(efi_early);
 992
 993         /*
 994          * If the boot loader gave us a value for secure_boot then we use that,
 995          * otherwise we ask the BIOS.
 996          */
 997         if (boot_params->secure_boot == efi_secureboot_mode_unset)
 998                 boot_params->secure_boot = efi_get_secureboot(sys_table);
 999
1000         /* Ask the firmware to clear memory on unclean shutdown */
1001         efi_enable_reset_attack_mitigation(sys_table);
1002         efi_retrieve_tpm2_eventlog(sys_table);
1003
1004         setup_graphics(boot_params);
1005
1006         setup_efi_pci(boot_params);
1007
1008         setup_quirks(boot_params);
1009
1010         status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
1011                                 sizeof(*gdt), (void **)&gdt);
1012         if (status != EFI_SUCCESS) {
1013                 efi_printk(sys_table, "Failed to alloc mem for gdt structure\n");
1014                 goto fail;
1015         }
1016
1017         gdt->size = 0x800;
1018         status = efi_low_alloc(sys_table, gdt->size, 8,
1019                            (unsigned long *)&gdt->address);
1020         if (status != EFI_SUCCESS) {
1021                 efi_printk(sys_table, "Failed to alloc mem for gdt\n");
1022                 goto fail;
1023         }
1024
1025         /*
1026          * If the kernel isn't already loaded at the preferred load
1027          * address, relocate it.
1028          */
1029         if (hdr->pref_address != hdr->code32_start) {
1030                 unsigned long bzimage_addr = hdr->code32_start;
1031                 status = efi_relocate_kernel(sys_table, &bzimage_addr,
1032                                              hdr->init_size, hdr->init_size,
1033                                              hdr->pref_address,
1034                                              hdr->kernel_alignment);
1035                 if (status != EFI_SUCCESS) {
1036                         efi_printk(sys_table, "efi_relocate_kernel() failed!\n");
1037                         goto fail;
1038                 }
1039
1040                 hdr->pref_address = hdr->code32_start;
1041                 hdr->code32_start = bzimage_addr;
1042         }
1043
1044         status = exit_boot(boot_params, handle, is64);
1045         if (status != EFI_SUCCESS) {
1046                 efi_printk(sys_table, "exit_boot() failed!\n");
1047                 goto fail;
1048         }
1049
1050         memset((char *)gdt->address, 0x0, gdt->size);
1051         desc = (struct desc_struct *)gdt->address;
1052
1053         /* The first GDT is a dummy. */
1054         desc++;
1055
1056         if (IS_ENABLED(CONFIG_X86_64)) {
1057                 /* __KERNEL32_CS */
1058                 desc->limit0 = 0xffff;
1059                 desc->base0 = 0x0000;
1060                 desc->base1 = 0x0000;
1061                 desc->type = SEG_TYPE_CODE | SEG_TYPE_EXEC_READ;
1062                 desc->s = DESC_TYPE_CODE_DATA;
1063                 desc->dpl = 0;
1064                 desc->p = 1;
1065                 desc->limit1 = 0xf;
1066                 desc->avl = 0;
1067                 desc->l = 0;
1068                 desc->d = SEG_OP_SIZE_32BIT;
1069                 desc->g = SEG_GRANULARITY_4KB;
1070                 desc->base2 = 0x00;
1071                 desc++;
1072         } else {
1073                 /* Second entry is unused on 32-bit */
1074                 desc++;
1075         }
1076
1077         /* __KERNEL_CS */
1078         desc->limit0 = 0xffff;
1079         desc->base0 = 0x0000;
1080         desc->base1 = 0x0000;
1081         desc->type = SEG_TYPE_CODE | SEG_TYPE_EXEC_READ;
1082         desc->s = DESC_TYPE_CODE_DATA;
1083         desc->dpl = 0;
1084         desc->p = 1;
1085         desc->limit1 = 0xf;
1086         desc->avl = 0;
1087         if (IS_ENABLED(CONFIG_X86_64)) {
1088                 desc->l = 1;
1089                 desc->d = 0;
1090         } else {
1091                 desc->l = 0;
1092                 desc->d = SEG_OP_SIZE_32BIT;
1093         }
1094         desc->g = SEG_GRANULARITY_4KB;
1095         desc->base2 = 0x00;
1096         desc++;
1097
1098         /* __KERNEL_DS */
1099         desc->limit0 = 0xffff;
1100         desc->base0 = 0x0000;
1101         desc->base1 = 0x0000;
1102         desc->type = SEG_TYPE_DATA | SEG_TYPE_READ_WRITE;
1103         desc->s = DESC_TYPE_CODE_DATA;
1104         desc->dpl = 0;
1105         desc->p = 1;
1106         desc->limit1 = 0xf;
1107         desc->avl = 0;
1108         desc->l = 0;
1109         desc->d = SEG_OP_SIZE_32BIT;
1110         desc->g = SEG_GRANULARITY_4KB;
1111         desc->base2 = 0x00;
1112         desc++;
1113
1114         if (IS_ENABLED(CONFIG_X86_64)) {
1115                 /* Task segment value */
1116                 desc->limit0 = 0x0000;
1117                 desc->base0 = 0x0000;
1118                 desc->base1 = 0x0000;
1119                 desc->type = SEG_TYPE_TSS;
1120                 desc->s = 0;
1121                 desc->dpl = 0;
1122                 desc->p = 1;
1123                 desc->limit1 = 0x0;
1124                 desc->avl = 0;
1125                 desc->l = 0;
1126                 desc->d = 0;
1127                 desc->g = SEG_GRANULARITY_4KB;
1128                 desc->base2 = 0x00;
1129                 desc++;
1130         }
1131
1132         asm volatile("cli");
1133         asm volatile ("lgdt %0" : : "m" (*gdt));
1134
1135         return boot_params;
1136 fail:
1137         efi_printk(sys_table, "efi_main() failed!\n");
1138         return NULL;
1139 }