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 #include <asm/efi.h>
  13 #include <asm/setup.h>
  14 #include <asm/desc.h>
  15
  16 #undef memcpy                   /* Use memcpy from misc.c */
  17
  18 #include "eboot.h"
  19
  20 static efi_system_table_t *sys_table;
  21
  22 static struct efi_config *efi_early;
  23
  24 #define efi_call_early(f, ...)                                          \
  25         efi_early->call(efi_early->f, __VA_ARGS__);
  26
  27 #define BOOT_SERVICES(bits)                                             \
  28 static void setup_boot_services##bits(struct efi_config *c)             \
  29 {                                                                       \
  30         efi_system_table_##bits##_t *table;                             \
  31         efi_boot_services_##bits##_t *bt;                               \
  32                                                                         \
  33         table = (typeof(table))sys_table;                               \
  34                                                                         \
  35         c->text_output = table->con_out;                                \
  36                                                                         \
  37         bt = (typeof(bt))(unsigned long)(table->boottime);              \
  38                                                                         \
  39         c->allocate_pool = bt->allocate_pool;                           \
  40         c->allocate_pages = bt->allocate_pages;                         \
  41         c->get_memory_map = bt->get_memory_map;                         \
  42         c->free_pool = bt->free_pool;                                   \
  43         c->free_pages = bt->free_pages;                                 \
  44         c->locate_handle = bt->locate_handle;                           \
  45         c->handle_protocol = bt->handle_protocol;                       \
  46         c->exit_boot_services = bt->exit_boot_services;                 \
  47 }
  48 BOOT_SERVICES(32);
  49 BOOT_SERVICES(64);
  50
  51 void efi_char16_printk(efi_system_table_t *, efi_char16_t *);
  52
  53 static efi_status_t
  54 __file_size32(void *__fh, efi_char16_t *filename_16,
  55               void **handle, u64 *file_sz)
  56 {
  57         efi_file_handle_32_t *h, *fh = __fh;
  58         efi_file_info_t *info;
  59         efi_status_t status;
  60         efi_guid_t info_guid = EFI_FILE_INFO_ID;
  61         u32 info_sz;
  62
  63         status = efi_early->call((unsigned long)fh->open, fh, &h, filename_16,
  64                                  EFI_FILE_MODE_READ, (u64)0);
  65         if (status != EFI_SUCCESS) {
  66                 efi_printk(sys_table, "Failed to open file: ");
  67                 efi_char16_printk(sys_table, filename_16);
  68                 efi_printk(sys_table, "\n");
  69                 return status;
  70         }
  71
  72         *handle = h;
  73
  74         info_sz = 0;
  75         status = efi_early->call((unsigned long)h->get_info, h, &info_guid,
  76                                  &info_sz, NULL);
  77         if (status != EFI_BUFFER_TOO_SMALL) {
  78                 efi_printk(sys_table, "Failed to get file info size\n");
  79                 return status;
  80         }
  81
  82 grow:
  83         status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
  84                                 info_sz, (void **)&info);
  85         if (status != EFI_SUCCESS) {
  86                 efi_printk(sys_table, "Failed to alloc mem for file info\n");
  87                 return status;
  88         }
  89
  90         status = efi_early->call((unsigned long)h->get_info, h, &info_guid,
  91                                  &info_sz, info);
  92         if (status == EFI_BUFFER_TOO_SMALL) {
  93                 efi_call_early(free_pool, info);
  94                 goto grow;
  95         }
  96
  97         *file_sz = info->file_size;
  98         efi_call_early(free_pool, info);
  99
 100         if (status != EFI_SUCCESS)
 101                 efi_printk(sys_table, "Failed to get initrd info\n");
 102
 103         return status;
 104 }
 105
 106 static efi_status_t
 107 __file_size64(void *__fh, efi_char16_t *filename_16,
 108               void **handle, u64 *file_sz)
 109 {
 110         efi_file_handle_64_t *h, *fh = __fh;
 111         efi_file_info_t *info;
 112         efi_status_t status;
 113         efi_guid_t info_guid = EFI_FILE_INFO_ID;
 114         u64 info_sz;
 115
 116         status = efi_early->call((unsigned long)fh->open, fh, &h, filename_16,
 117                                  EFI_FILE_MODE_READ, (u64)0);
 118         if (status != EFI_SUCCESS) {
 119                 efi_printk(sys_table, "Failed to open file: ");
 120                 efi_char16_printk(sys_table, filename_16);
 121                 efi_printk(sys_table, "\n");
 122                 return status;
 123         }
 124
 125         *handle = h;
 126
 127         info_sz = 0;
 128         status = efi_early->call((unsigned long)h->get_info, h, &info_guid,
 129                                  &info_sz, NULL);
 130         if (status != EFI_BUFFER_TOO_SMALL) {
 131                 efi_printk(sys_table, "Failed to get file info size\n");
 132                 return status;
 133         }
 134
 135 grow:
 136         status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
 137                                 info_sz, (void **)&info);
 138         if (status != EFI_SUCCESS) {
 139                 efi_printk(sys_table, "Failed to alloc mem for file info\n");
 140                 return status;
 141         }
 142
 143         status = efi_early->call((unsigned long)h->get_info, h, &info_guid,
 144                                  &info_sz, info);
 145         if (status == EFI_BUFFER_TOO_SMALL) {
 146                 efi_call_early(free_pool, info);
 147                 goto grow;
 148         }
 149
 150         *file_sz = info->file_size;
 151         efi_call_early(free_pool, info);
 152
 153         if (status != EFI_SUCCESS)
 154                 efi_printk(sys_table, "Failed to get initrd info\n");
 155
 156         return status;
 157 }
 158 efi_status_t
 159 efi_file_size(efi_system_table_t *sys_table, void *__fh,
 160               efi_char16_t *filename_16, void **handle, u64 *file_sz)
 161 {
 162         if (efi_early->is64)
 163                 return __file_size64(__fh, filename_16, handle, file_sz);
 164
 165         return __file_size32(__fh, filename_16, handle, file_sz);
 166 }
 167
 168 efi_status_t
 169 efi_file_read(void *handle, unsigned long *size, void *addr)
 170 {
 171         unsigned long func;
 172
 173         if (efi_early->is64) {
 174                 efi_file_handle_64_t *fh = handle;
 175
 176                 func = (unsigned long)fh->read;
 177                 return efi_early->call(func, handle, size, addr);
 178         } else {
 179                 efi_file_handle_32_t *fh = handle;
 180
 181                 func = (unsigned long)fh->read;
 182                 return efi_early->call(func, handle, size, addr);
 183         }
 184 }
 185
 186 efi_status_t efi_file_close(void *handle)
 187 {
 188         if (efi_early->is64) {
 189                 efi_file_handle_64_t *fh = handle;
 190
 191                 return efi_early->call((unsigned long)fh->close, handle);
 192         } else {
 193                 efi_file_handle_32_t *fh = handle;
 194
 195                 return efi_early->call((unsigned long)fh->close, handle);
 196         }
 197 }
 198
 199 static inline efi_status_t __open_volume32(void *__image, void **__fh)
 200 {
 201         efi_file_io_interface_t *io;
 202         efi_loaded_image_32_t *image = __image;
 203         efi_file_handle_32_t *fh;
 204         efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
 205         efi_status_t status;
 206         void *handle = (void *)(unsigned long)image->device_handle;
 207         unsigned long func;
 208
 209         status = efi_call_early(handle_protocol, handle,
 210                                 &fs_proto, (void **)&io);
 211         if (status != EFI_SUCCESS) {
 212                 efi_printk(sys_table, "Failed to handle fs_proto\n");
 213                 return status;
 214         }
 215
 216         func = (unsigned long)io->open_volume;
 217         status = efi_early->call(func, io, &fh);
 218         if (status != EFI_SUCCESS)
 219                 efi_printk(sys_table, "Failed to open volume\n");
 220
 221         *__fh = fh;
 222         return status;
 223 }
 224
 225 static inline efi_status_t __open_volume64(void *__image, void **__fh)
 226 {
 227         efi_file_io_interface_t *io;
 228         efi_loaded_image_64_t *image = __image;
 229         efi_file_handle_64_t *fh;
 230         efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
 231         efi_status_t status;
 232         void *handle = (void *)(unsigned long)image->device_handle;
 233         unsigned long func;
 234
 235         status = efi_call_early(handle_protocol, handle,
 236                                 &fs_proto, (void **)&io);
 237         if (status != EFI_SUCCESS) {
 238                 efi_printk(sys_table, "Failed to handle fs_proto\n");
 239                 return status;
 240         }
 241
 242         func = (unsigned long)io->open_volume;
 243         status = efi_early->call(func, io, &fh);
 244         if (status != EFI_SUCCESS)
 245                 efi_printk(sys_table, "Failed to open volume\n");
 246
 247         *__fh = fh;
 248         return status;
 249 }
 250
 251 efi_status_t
 252 efi_open_volume(efi_system_table_t *sys_table, void *__image, void **__fh)
 253 {
 254         if (efi_early->is64)
 255                 return __open_volume64(__image, __fh);
 256
 257         return __open_volume32(__image, __fh);
 258 }
 259
 260 void efi_char16_printk(efi_system_table_t *table, efi_char16_t *str)
 261 {
 262         unsigned long output_string;
 263         size_t offset;
 264
 265         if (efi_early->is64) {
 266                 struct efi_simple_text_output_protocol_64 *out;
 267                 u64 *func;
 268
 269                 offset = offsetof(typeof(*out), output_string);
 270                 output_string = efi_early->text_output + offset;
 271                 out = (typeof(out))(unsigned long)efi_early->text_output;
 272                 func = (u64 *)output_string;
 273
 274                 efi_early->call(*func, out, str);
 275         } else {
 276                 struct efi_simple_text_output_protocol_32 *out;
 277                 u32 *func;
 278
 279                 offset = offsetof(typeof(*out), output_string);
 280                 output_string = efi_early->text_output + offset;
 281                 out = (typeof(out))(unsigned long)efi_early->text_output;
 282                 func = (u32 *)output_string;
 283
 284                 efi_early->call(*func, out, str);
 285         }
 286 }
 287
 288 #include "../../../../drivers/firmware/efi/libstub/efi-stub-helper.c"
 289
 290 static void find_bits(unsigned long mask, u8 *pos, u8 *size)
 291 {
 292         u8 first, len;
 293
 294         first = 0;
 295         len = 0;
 296
 297         if (mask) {
 298                 while (!(mask & 0x1)) {
 299                         mask = mask >> 1;
 300                         first++;
 301                 }
 302
 303                 while (mask & 0x1) {
 304                         mask = mask >> 1;
 305                         len++;
 306                 }
 307         }
 308
 309         *pos = first;
 310         *size = len;
 311 }
 312
 313 static efi_status_t
 314 __setup_efi_pci32(efi_pci_io_protocol_32 *pci, struct pci_setup_rom **__rom)
 315 {
 316         struct pci_setup_rom *rom = NULL;
 317         efi_status_t status;
 318         unsigned long size;
 319         uint64_t attributes;
 320
 321         status = efi_early->call(pci->attributes, pci,
 322                                  EfiPciIoAttributeOperationGet, 0, 0,
 323                                  &attributes);
 324         if (status != EFI_SUCCESS)
 325                 return status;
 326
 327         if (!pci->romimage || !pci->romsize)
 328                 return EFI_INVALID_PARAMETER;
 329
 330         size = pci->romsize + sizeof(*rom);
 331
 332         status = efi_call_early(allocate_pool, EFI_LOADER_DATA, size, &rom);
 333         if (status != EFI_SUCCESS)
 334                 return status;
 335
 336         memset(rom, 0, sizeof(*rom));
 337
 338         rom->data.type = SETUP_PCI;
 339         rom->data.len = size - sizeof(struct setup_data);
 340         rom->data.next = 0;
 341         rom->pcilen = pci->romsize;
 342         *__rom = rom;
 343
 344         status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
 345                                  PCI_VENDOR_ID, 1, &(rom->vendor));
 346
 347         if (status != EFI_SUCCESS)
 348                 goto free_struct;
 349
 350         status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
 351                                  PCI_DEVICE_ID, 1, &(rom->devid));
 352
 353         if (status != EFI_SUCCESS)
 354                 goto free_struct;
 355
 356         status = efi_early->call(pci->get_location, pci, &(rom->segment),
 357                                  &(rom->bus), &(rom->device), &(rom->function));
 358
 359         if (status != EFI_SUCCESS)
 360                 goto free_struct;
 361
 362         memcpy(rom->romdata, pci->romimage, pci->romsize);
 363         return status;
 364
 365 free_struct:
 366         efi_call_early(free_pool, rom);
 367         return status;
 368 }
 369
 370 static void
 371 setup_efi_pci32(struct boot_params *params, void **pci_handle,
 372                 unsigned long size)
 373 {
 374         efi_pci_io_protocol_32 *pci = NULL;
 375         efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
 376         u32 *handles = (u32 *)(unsigned long)pci_handle;
 377         efi_status_t status;
 378         unsigned long nr_pci;
 379         struct setup_data *data;
 380         int i;
 381
 382         data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
 383
 384         while (data && data->next)
 385                 data = (struct setup_data *)(unsigned long)data->next;
 386
 387         nr_pci = size / sizeof(u32);
 388         for (i = 0; i < nr_pci; i++) {
 389                 struct pci_setup_rom *rom = NULL;
 390                 u32 h = handles[i];
 391
 392                 status = efi_call_early(handle_protocol, h,
 393                                         &pci_proto, (void **)&pci);
 394
 395                 if (status != EFI_SUCCESS)
 396                         continue;
 397
 398                 if (!pci)
 399                         continue;
 400
 401                 status = __setup_efi_pci32(pci, &rom);
 402                 if (status != EFI_SUCCESS)
 403                         continue;
 404
 405                 if (data)
 406                         data->next = (unsigned long)rom;
 407                 else
 408                         params->hdr.setup_data = (unsigned long)rom;
 409
 410                 data = (struct setup_data *)rom;
 411
 412         }
 413 }
 414
 415 static efi_status_t
 416 __setup_efi_pci64(efi_pci_io_protocol_64 *pci, struct pci_setup_rom **__rom)
 417 {
 418         struct pci_setup_rom *rom;
 419         efi_status_t status;
 420         unsigned long size;
 421         uint64_t attributes;
 422
 423         status = efi_early->call(pci->attributes, pci,
 424                                  EfiPciIoAttributeOperationGet, 0,
 425                                  &attributes);
 426         if (status != EFI_SUCCESS)
 427                 return status;
 428
 429         if (!pci->romimage || !pci->romsize)
 430                 return EFI_INVALID_PARAMETER;
 431
 432         size = pci->romsize + sizeof(*rom);
 433
 434         status = efi_call_early(allocate_pool, EFI_LOADER_DATA, size, &rom);
 435         if (status != EFI_SUCCESS)
 436                 return status;
 437
 438         rom->data.type = SETUP_PCI;
 439         rom->data.len = size - sizeof(struct setup_data);
 440         rom->data.next = 0;
 441         rom->pcilen = pci->romsize;
 442         *__rom = rom;
 443
 444         status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
 445                                  PCI_VENDOR_ID, 1, &(rom->vendor));
 446
 447         if (status != EFI_SUCCESS)
 448                 goto free_struct;
 449
 450         status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
 451                                  PCI_DEVICE_ID, 1, &(rom->devid));
 452
 453         if (status != EFI_SUCCESS)
 454                 goto free_struct;
 455
 456         status = efi_early->call(pci->get_location, pci, &(rom->segment),
 457                                  &(rom->bus), &(rom->device), &(rom->function));
 458
 459         if (status != EFI_SUCCESS)
 460                 goto free_struct;
 461
 462         memcpy(rom->romdata, pci->romimage, pci->romsize);
 463         return status;
 464
 465 free_struct:
 466         efi_call_early(free_pool, rom);
 467         return status;
 468
 469 }
 470
 471 static void
 472 setup_efi_pci64(struct boot_params *params, void **pci_handle,
 473                 unsigned long size)
 474 {
 475         efi_pci_io_protocol_64 *pci = NULL;
 476         efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
 477         u64 *handles = (u64 *)(unsigned long)pci_handle;
 478         efi_status_t status;
 479         unsigned long nr_pci;
 480         struct setup_data *data;
 481         int i;
 482
 483         data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
 484
 485         while (data && data->next)
 486                 data = (struct setup_data *)(unsigned long)data->next;
 487
 488         nr_pci = size / sizeof(u64);
 489         for (i = 0; i < nr_pci; i++) {
 490                 struct pci_setup_rom *rom = NULL;
 491                 u64 h = handles[i];
 492
 493                 status = efi_call_early(handle_protocol, h,
 494                                         &pci_proto, (void **)&pci);
 495
 496                 if (status != EFI_SUCCESS)
 497                         continue;
 498
 499                 if (!pci)
 500                         continue;
 501
 502                 status = __setup_efi_pci64(pci, &rom);
 503                 if (status != EFI_SUCCESS)
 504                         continue;
 505
 506                 if (data)
 507                         data->next = (unsigned long)rom;
 508                 else
 509                         params->hdr.setup_data = (unsigned long)rom;
 510
 511                 data = (struct setup_data *)rom;
 512
 513         }
 514 }
 515
 516 /*
 517  * There's no way to return an informative status from this function,
 518  * because any analysis (and printing of error messages) needs to be
 519  * done directly at the EFI function call-site.
 520  *
 521  * For example, EFI_INVALID_PARAMETER could indicate a bug or maybe we
 522  * just didn't find any PCI devices, but there's no way to tell outside
 523  * the context of the call.
 524  */
 525 static void setup_efi_pci(struct boot_params *params)
 526 {
 527         efi_status_t status;
 528         void **pci_handle = NULL;
 529         efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
 530         unsigned long size = 0;
 531
 532         status = efi_call_early(locate_handle,
 533                                 EFI_LOCATE_BY_PROTOCOL,
 534                                 &pci_proto, NULL, &size, pci_handle);
 535
 536         if (status == EFI_BUFFER_TOO_SMALL) {
 537                 status = efi_call_early(allocate_pool,
 538                                         EFI_LOADER_DATA,
 539                                         size, (void **)&pci_handle);
 540
 541                 if (status != EFI_SUCCESS)
 542                         return;
 543
 544                 status = efi_call_early(locate_handle,
 545                                         EFI_LOCATE_BY_PROTOCOL, &pci_proto,
 546                                         NULL, &size, pci_handle);
 547         }
 548
 549         if (status != EFI_SUCCESS)
 550                 goto free_handle;
 551
 552         if (efi_early->is64)
 553                 setup_efi_pci64(params, pci_handle, size);
 554         else
 555                 setup_efi_pci32(params, pci_handle, size);
 556
 557 free_handle:
 558         efi_call_early(free_pool, pci_handle);
 559 }
 560
 561 static void
 562 setup_pixel_info(struct screen_info *si, u32 pixels_per_scan_line,
 563                  struct efi_pixel_bitmask pixel_info, int pixel_format)
 564 {
 565         if (pixel_format == PIXEL_RGB_RESERVED_8BIT_PER_COLOR) {
 566                 si->lfb_depth = 32;
 567                 si->lfb_linelength = pixels_per_scan_line * 4;
 568                 si->red_size = 8;
 569                 si->red_pos = 0;
 570                 si->green_size = 8;
 571                 si->green_pos = 8;
 572                 si->blue_size = 8;
 573                 si->blue_pos = 16;
 574                 si->rsvd_size = 8;
 575                 si->rsvd_pos = 24;
 576         } else if (pixel_format == PIXEL_BGR_RESERVED_8BIT_PER_COLOR) {
 577                 si->lfb_depth = 32;
 578                 si->lfb_linelength = pixels_per_scan_line * 4;
 579                 si->red_size = 8;
 580                 si->red_pos = 16;
 581                 si->green_size = 8;
 582                 si->green_pos = 8;
 583                 si->blue_size = 8;
 584                 si->blue_pos = 0;
 585                 si->rsvd_size = 8;
 586                 si->rsvd_pos = 24;
 587         } else if (pixel_format == PIXEL_BIT_MASK) {
 588                 find_bits(pixel_info.red_mask, &si->red_pos, &si->red_size);
 589                 find_bits(pixel_info.green_mask, &si->green_pos,
 590                           &si->green_size);
 591                 find_bits(pixel_info.blue_mask, &si->blue_pos, &si->blue_size);
 592                 find_bits(pixel_info.reserved_mask, &si->rsvd_pos,
 593                           &si->rsvd_size);
 594                 si->lfb_depth = si->red_size + si->green_size +
 595                         si->blue_size + si->rsvd_size;
 596                 si->lfb_linelength = (pixels_per_scan_line * si->lfb_depth) / 8;
 597         } else {
 598                 si->lfb_depth = 4;
 599                 si->lfb_linelength = si->lfb_width / 2;
 600                 si->red_size = 0;
 601                 si->red_pos = 0;
 602                 si->green_size = 0;
 603                 si->green_pos = 0;
 604                 si->blue_size = 0;
 605                 si->blue_pos = 0;
 606                 si->rsvd_size = 0;
 607                 si->rsvd_pos = 0;
 608         }
 609 }
 610
 611 static efi_status_t
 612 __gop_query32(struct efi_graphics_output_protocol_32 *gop32,
 613               struct efi_graphics_output_mode_info **info,
 614               unsigned long *size, u32 *fb_base)
 615 {
 616         struct efi_graphics_output_protocol_mode_32 *mode;
 617         efi_status_t status;
 618         unsigned long m;
 619
 620         m = gop32->mode;
 621         mode = (struct efi_graphics_output_protocol_mode_32 *)m;
 622
 623         status = efi_early->call(gop32->query_mode, gop32,
 624                                  mode->mode, size, info);
 625         if (status != EFI_SUCCESS)
 626                 return status;
 627
 628         *fb_base = mode->frame_buffer_base;
 629         return status;
 630 }
 631
 632 static efi_status_t
 633 setup_gop32(struct screen_info *si, efi_guid_t *proto,
 634             unsigned long size, void **gop_handle)
 635 {
 636         struct efi_graphics_output_protocol_32 *gop32, *first_gop;
 637         unsigned long nr_gops;
 638         u16 width, height;
 639         u32 pixels_per_scan_line;
 640         u32 fb_base;
 641         struct efi_pixel_bitmask pixel_info;
 642         int pixel_format;
 643         efi_status_t status;
 644         u32 *handles = (u32 *)(unsigned long)gop_handle;
 645         int i;
 646
 647         first_gop = NULL;
 648         gop32 = NULL;
 649
 650         nr_gops = size / sizeof(u32);
 651         for (i = 0; i < nr_gops; i++) {
 652                 struct efi_graphics_output_mode_info *info = NULL;
 653                 efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
 654                 bool conout_found = false;
 655                 void *dummy = NULL;
 656                 u32 h = handles[i];
 657
 658                 status = efi_call_early(handle_protocol, h,
 659                                         proto, (void **)&gop32);
 660                 if (status != EFI_SUCCESS)
 661                         continue;
 662
 663                 status = efi_call_early(handle_protocol, h,
 664                                         &conout_proto, &dummy);
 665                 if (status == EFI_SUCCESS)
 666                         conout_found = true;
 667
 668                 status = __gop_query32(gop32, &info, &size, &fb_base);
 669                 if (status == EFI_SUCCESS && (!first_gop || conout_found)) {
 670                         /*
 671                          * Systems that use the UEFI Console Splitter may
 672                          * provide multiple GOP devices, not all of which are
 673                          * backed by real hardware. The workaround is to search
 674                          * for a GOP implementing the ConOut protocol, and if
 675                          * one isn't found, to just fall back to the first GOP.
 676                          */
 677                         width = info->horizontal_resolution;
 678                         height = info->vertical_resolution;
 679                         pixel_format = info->pixel_format;
 680                         pixel_info = info->pixel_information;
 681                         pixels_per_scan_line = info->pixels_per_scan_line;
 682
 683                         /*
 684                          * Once we've found a GOP supporting ConOut,
 685                          * don't bother looking any further.
 686                          */
 687                         first_gop = gop32;
 688                         if (conout_found)
 689                                 break;
 690                 }
 691         }
 692
 693         /* Did we find any GOPs? */
 694         if (!first_gop)
 695                 goto out;
 696
 697         /* EFI framebuffer */
 698         si->orig_video_isVGA = VIDEO_TYPE_EFI;
 699
 700         si->lfb_width = width;
 701         si->lfb_height = height;
 702         si->lfb_base = fb_base;
 703         si->pages = 1;
 704
 705         setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format);
 706
 707         si->lfb_size = si->lfb_linelength * si->lfb_height;
 708
 709         si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
 710 out:
 711         return status;
 712 }
 713
 714 static efi_status_t
 715 __gop_query64(struct efi_graphics_output_protocol_64 *gop64,
 716               struct efi_graphics_output_mode_info **info,
 717               unsigned long *size, u32 *fb_base)
 718 {
 719         struct efi_graphics_output_protocol_mode_64 *mode;
 720         efi_status_t status;
 721         unsigned long m;
 722
 723         m = gop64->mode;
 724         mode = (struct efi_graphics_output_protocol_mode_64 *)m;
 725
 726         status = efi_early->call(gop64->query_mode, gop64,
 727                                  mode->mode, size, info);
 728         if (status != EFI_SUCCESS)
 729                 return status;
 730
 731         *fb_base = mode->frame_buffer_base;
 732         return status;
 733 }
 734
 735 static efi_status_t
 736 setup_gop64(struct screen_info *si, efi_guid_t *proto,
 737             unsigned long size, void **gop_handle)
 738 {
 739         struct efi_graphics_output_protocol_64 *gop64, *first_gop;
 740         unsigned long nr_gops;
 741         u16 width, height;
 742         u32 pixels_per_scan_line;
 743         u32 fb_base;
 744         struct efi_pixel_bitmask pixel_info;
 745         int pixel_format;
 746         efi_status_t status;
 747         u64 *handles = (u64 *)(unsigned long)gop_handle;
 748         int i;
 749
 750         first_gop = NULL;
 751         gop64 = NULL;
 752
 753         nr_gops = size / sizeof(u64);
 754         for (i = 0; i < nr_gops; i++) {
 755                 struct efi_graphics_output_mode_info *info = NULL;
 756                 efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
 757                 bool conout_found = false;
 758                 void *dummy = NULL;
 759                 u64 h = handles[i];
 760
 761                 status = efi_call_early(handle_protocol, h,
 762                                         proto, (void **)&gop64);
 763                 if (status != EFI_SUCCESS)
 764                         continue;
 765
 766                 status = efi_call_early(handle_protocol, h,
 767                                         &conout_proto, &dummy);
 768                 if (status == EFI_SUCCESS)
 769                         conout_found = true;
 770
 771                 status = __gop_query64(gop64, &info, &size, &fb_base);
 772                 if (status == EFI_SUCCESS && (!first_gop || conout_found)) {
 773                         /*
 774                          * Systems that use the UEFI Console Splitter may
 775                          * provide multiple GOP devices, not all of which are
 776                          * backed by real hardware. The workaround is to search
 777                          * for a GOP implementing the ConOut protocol, and if
 778                          * one isn't found, to just fall back to the first GOP.
 779                          */
 780                         width = info->horizontal_resolution;
 781                         height = info->vertical_resolution;
 782                         pixel_format = info->pixel_format;
 783                         pixel_info = info->pixel_information;
 784                         pixels_per_scan_line = info->pixels_per_scan_line;
 785
 786                         /*
 787                          * Once we've found a GOP supporting ConOut,
 788                          * don't bother looking any further.
 789                          */
 790                         first_gop = gop64;
 791                         if (conout_found)
 792                                 break;
 793                 }
 794         }
 795
 796         /* Did we find any GOPs? */
 797         if (!first_gop)
 798                 goto out;
 799
 800         /* EFI framebuffer */
 801         si->orig_video_isVGA = VIDEO_TYPE_EFI;
 802
 803         si->lfb_width = width;
 804         si->lfb_height = height;
 805         si->lfb_base = fb_base;
 806         si->pages = 1;
 807
 808         setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format);
 809
 810         si->lfb_size = si->lfb_linelength * si->lfb_height;
 811
 812         si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
 813 out:
 814         return status;
 815 }
 816
 817 /*
 818  * See if we have Graphics Output Protocol
 819  */
 820 static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto,
 821                               unsigned long size)
 822 {
 823         efi_status_t status;
 824         void **gop_handle = NULL;
 825
 826         status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
 827                                 size, (void **)&gop_handle);
 828         if (status != EFI_SUCCESS)
 829                 return status;
 830
 831         status = efi_call_early(locate_handle,
 832                                 EFI_LOCATE_BY_PROTOCOL,
 833                                 proto, NULL, &size, gop_handle);
 834         if (status != EFI_SUCCESS)
 835                 goto free_handle;
 836
 837         if (efi_early->is64)
 838                 status = setup_gop64(si, proto, size, gop_handle);
 839         else
 840                 status = setup_gop32(si, proto, size, gop_handle);
 841
 842 free_handle:
 843         efi_call_early(free_pool, gop_handle);
 844         return status;
 845 }
 846
 847 static efi_status_t
 848 setup_uga32(void **uga_handle, unsigned long size, u32 *width, u32 *height)
 849 {
 850         struct efi_uga_draw_protocol *uga = NULL, *first_uga;
 851         efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
 852         unsigned long nr_ugas;
 853         u32 *handles = (u32 *)uga_handle;;
 854         efi_status_t status;
 855         int i;
 856
 857         first_uga = NULL;
 858         nr_ugas = size / sizeof(u32);
 859         for (i = 0; i < nr_ugas; i++) {
 860                 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
 861                 u32 w, h, depth, refresh;
 862                 void *pciio;
 863                 u32 handle = handles[i];
 864
 865                 status = efi_call_early(handle_protocol, handle,
 866                                         &uga_proto, (void **)&uga);
 867                 if (status != EFI_SUCCESS)
 868                         continue;
 869
 870                 efi_call_early(handle_protocol, handle, &pciio_proto, &pciio);
 871
 872                 status = efi_early->call((unsigned long)uga->get_mode, uga,
 873                                          &w, &h, &depth, &refresh);
 874                 if (status == EFI_SUCCESS && (!first_uga || pciio)) {
 875                         *width = w;
 876                         *height = h;
 877
 878                         /*
 879                          * Once we've found a UGA supporting PCIIO,
 880                          * don't bother looking any further.
 881                          */
 882                         if (pciio)
 883                                 break;
 884
 885                         first_uga = uga;
 886                 }
 887         }
 888
 889         return status;
 890 }
 891
 892 static efi_status_t
 893 setup_uga64(void **uga_handle, unsigned long size, u32 *width, u32 *height)
 894 {
 895         struct efi_uga_draw_protocol *uga = NULL, *first_uga;
 896         efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
 897         unsigned long nr_ugas;
 898         u64 *handles = (u64 *)uga_handle;;
 899         efi_status_t status;
 900         int i;
 901
 902         first_uga = NULL;
 903         nr_ugas = size / sizeof(u64);
 904         for (i = 0; i < nr_ugas; i++) {
 905                 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
 906                 u32 w, h, depth, refresh;
 907                 void *pciio;
 908                 u64 handle = handles[i];
 909
 910                 status = efi_call_early(handle_protocol, handle,
 911                                         &uga_proto, (void **)&uga);
 912                 if (status != EFI_SUCCESS)
 913                         continue;
 914
 915                 efi_call_early(handle_protocol, handle, &pciio_proto, &pciio);
 916
 917                 status = efi_early->call((unsigned long)uga->get_mode, uga,
 918                                          &w, &h, &depth, &refresh);
 919                 if (status == EFI_SUCCESS && (!first_uga || pciio)) {
 920                         *width = w;
 921                         *height = h;
 922
 923                         /*
 924                          * Once we've found a UGA supporting PCIIO,
 925                          * don't bother looking any further.
 926                          */
 927                         if (pciio)
 928                                 break;
 929
 930                         first_uga = uga;
 931                 }
 932         }
 933
 934         return status;
 935 }
 936
 937 /*
 938  * See if we have Universal Graphics Adapter (UGA) protocol
 939  */
 940 static efi_status_t setup_uga(struct screen_info *si, efi_guid_t *uga_proto,
 941                               unsigned long size)
 942 {
 943         efi_status_t status;
 944         u32 width, height;
 945         void **uga_handle = NULL;
 946
 947         status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
 948                                 size, (void **)&uga_handle);
 949         if (status != EFI_SUCCESS)
 950                 return status;
 951
 952         status = efi_call_early(locate_handle,
 953                                 EFI_LOCATE_BY_PROTOCOL,
 954                                 uga_proto, NULL, &size, uga_handle);
 955         if (status != EFI_SUCCESS)
 956                 goto free_handle;
 957
 958         height = 0;
 959         width = 0;
 960
 961         if (efi_early->is64)
 962                 status = setup_uga64(uga_handle, size, &width, &height);
 963         else
 964                 status = setup_uga32(uga_handle, size, &width, &height);
 965
 966         if (!width && !height)
 967                 goto free_handle;
 968
 969         /* EFI framebuffer */
 970         si->orig_video_isVGA = VIDEO_TYPE_EFI;
 971
 972         si->lfb_depth = 32;
 973         si->lfb_width = width;
 974         si->lfb_height = height;
 975
 976         si->red_size = 8;
 977         si->red_pos = 16;
 978         si->green_size = 8;
 979         si->green_pos = 8;
 980         si->blue_size = 8;
 981         si->blue_pos = 0;
 982         si->rsvd_size = 8;
 983         si->rsvd_pos = 24;
 984
 985 free_handle:
 986         efi_call_early(free_pool, uga_handle);
 987         return status;
 988 }
 989
 990 void setup_graphics(struct boot_params *boot_params)
 991 {
 992         efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
 993         struct screen_info *si;
 994         efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
 995         efi_status_t status;
 996         unsigned long size;
 997         void **gop_handle = NULL;
 998         void **uga_handle = NULL;
 999
1000         si = &boot_params->screen_info;
1001         memset(si, 0, sizeof(*si));
1002
1003         size = 0;
1004         status = efi_call_early(locate_handle,
1005                                 EFI_LOCATE_BY_PROTOCOL,
1006                                 &graphics_proto, NULL, &size, gop_handle);
1007         if (status == EFI_BUFFER_TOO_SMALL)
1008                 status = setup_gop(si, &graphics_proto, size);
1009
1010         if (status != EFI_SUCCESS) {
1011                 size = 0;
1012                 status = efi_call_early(locate_handle,
1013                                         EFI_LOCATE_BY_PROTOCOL,
1014                                         &uga_proto, NULL, &size, uga_handle);
1015                 if (status == EFI_BUFFER_TOO_SMALL)
1016                         setup_uga(si, &uga_proto, size);
1017         }
1018 }
1019
1020 /*
1021  * Because the x86 boot code expects to be passed a boot_params we
1022  * need to create one ourselves (usually the bootloader would create
1023  * one for us).
1024  *
1025  * The caller is responsible for filling out ->code32_start in the
1026  * returned boot_params.
1027  */
1028 struct boot_params *make_boot_params(struct efi_config *c)
1029 {
1030         struct boot_params *boot_params;
1031         struct sys_desc_table *sdt;
1032         struct apm_bios_info *bi;
1033         struct setup_header *hdr;
1034         struct efi_info *efi;
1035         efi_loaded_image_t *image;
1036         void *options, *handle;
1037         efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
1038         int options_size = 0;
1039         efi_status_t status;
1040         char *cmdline_ptr;
1041         u16 *s2;
1042         u8 *s1;
1043         int i;
1044         unsigned long ramdisk_addr;
1045         unsigned long ramdisk_size;
1046
1047         efi_early = c;
1048         sys_table = (efi_system_table_t *)(unsigned long)efi_early->table;
1049         handle = (void *)(unsigned long)efi_early->image_handle;
1050
1051         /* Check if we were booted by the EFI firmware */
1052         if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
1053                 return NULL;
1054
1055         if (efi_early->is64)
1056                 setup_boot_services64(efi_early);
1057         else
1058                 setup_boot_services32(efi_early);
1059
1060         status = efi_call_early(handle_protocol, handle,
1061                                 &proto, (void *)&image);
1062         if (status != EFI_SUCCESS) {
1063                 efi_printk(sys_table, "Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
1064                 return NULL;
1065         }
1066
1067         status = efi_low_alloc(sys_table, 0x4000, 1,
1068                                (unsigned long *)&boot_params);
1069         if (status != EFI_SUCCESS) {
1070                 efi_printk(sys_table, "Failed to alloc lowmem for boot params\n");
1071                 return NULL;
1072         }
1073
1074         memset(boot_params, 0x0, 0x4000);
1075
1076         hdr = &boot_params->hdr;
1077         efi = &boot_params->efi_info;
1078         bi = &boot_params->apm_bios_info;
1079         sdt = &boot_params->sys_desc_table;
1080
1081         /* Copy the second sector to boot_params */
1082         memcpy(&hdr->jump, image->image_base + 512, 512);
1083
1084         /*
1085          * Fill out some of the header fields ourselves because the
1086          * EFI firmware loader doesn't load the first sector.
1087          */
1088         hdr->root_flags = 1;
1089         hdr->vid_mode = 0xffff;
1090         hdr->boot_flag = 0xAA55;
1091
1092         hdr->type_of_loader = 0x21;
1093
1094         /* Convert unicode cmdline to ascii */
1095         cmdline_ptr = efi_convert_cmdline(sys_table, image, &options_size);
1096         if (!cmdline_ptr)
1097                 goto fail;
1098         hdr->cmd_line_ptr = (unsigned long)cmdline_ptr;
1099
1100         hdr->ramdisk_image = 0;
1101         hdr->ramdisk_size = 0;
1102
1103         /* Clear APM BIOS info */
1104         memset(bi, 0, sizeof(*bi));
1105
1106         memset(sdt, 0, sizeof(*sdt));
1107
1108         status = handle_cmdline_files(sys_table, image,
1109                                       (char *)(unsigned long)hdr->cmd_line_ptr,
1110                                       "initrd=", hdr->initrd_addr_max,
1111                                       &ramdisk_addr, &ramdisk_size);
1112
1113         if (status != EFI_SUCCESS &&
1114             hdr->xloadflags & XLF_CAN_BE_LOADED_ABOVE_4G) {
1115                 efi_printk(sys_table, "Trying to load files to higher address\n");
1116                 status = handle_cmdline_files(sys_table, image,
1117                                       (char *)(unsigned long)hdr->cmd_line_ptr,
1118                                       "initrd=", -1UL,
1119                                       &ramdisk_addr, &ramdisk_size);
1120         }
1121
1122         if (status != EFI_SUCCESS)
1123                 goto fail2;
1124         hdr->ramdisk_image = ramdisk_addr & 0xffffffff;
1125         hdr->ramdisk_size  = ramdisk_size & 0xffffffff;
1126         boot_params->ext_ramdisk_image = (u64)ramdisk_addr >> 32;
1127         boot_params->ext_ramdisk_size  = (u64)ramdisk_size >> 32;
1128
1129         return boot_params;
1130 fail2:
1131         efi_free(sys_table, options_size, hdr->cmd_line_ptr);
1132 fail:
1133         efi_free(sys_table, 0x4000, (unsigned long)boot_params);
1134         return NULL;
1135 }
1136
1137 static void add_e820ext(struct boot_params *params,
1138                         struct setup_data *e820ext, u32 nr_entries)
1139 {
1140         struct setup_data *data;
1141         efi_status_t status;
1142         unsigned long size;
1143
1144         e820ext->type = SETUP_E820_EXT;
1145         e820ext->len = nr_entries * sizeof(struct e820entry);
1146         e820ext->next = 0;
1147
1148         data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
1149
1150         while (data && data->next)
1151                 data = (struct setup_data *)(unsigned long)data->next;
1152
1153         if (data)
1154                 data->next = (unsigned long)e820ext;
1155         else
1156                 params->hdr.setup_data = (unsigned long)e820ext;
1157 }
1158
1159 static efi_status_t setup_e820(struct boot_params *params,
1160                                struct setup_data *e820ext, u32 e820ext_size)
1161 {
1162         struct e820entry *e820_map = &params->e820_map[0];
1163         struct efi_info *efi = &params->efi_info;
1164         struct e820entry *prev = NULL;
1165         u32 nr_entries;
1166         u32 nr_desc;
1167         int i;
1168
1169         nr_entries = 0;
1170         nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size;
1171
1172         for (i = 0; i < nr_desc; i++) {
1173                 efi_memory_desc_t *d;
1174                 unsigned int e820_type = 0;
1175                 unsigned long m = efi->efi_memmap;
1176
1177                 d = (efi_memory_desc_t *)(m + (i * efi->efi_memdesc_size));
1178                 switch (d->type) {
1179                 case EFI_RESERVED_TYPE:
1180                 case EFI_RUNTIME_SERVICES_CODE:
1181                 case EFI_RUNTIME_SERVICES_DATA:
1182                 case EFI_MEMORY_MAPPED_IO:
1183                 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1184                 case EFI_PAL_CODE:
1185                         e820_type = E820_RESERVED;
1186                         break;
1187
1188                 case EFI_UNUSABLE_MEMORY:
1189                         e820_type = E820_UNUSABLE;
1190                         break;
1191
1192                 case EFI_ACPI_RECLAIM_MEMORY:
1193                         e820_type = E820_ACPI;
1194                         break;
1195
1196                 case EFI_LOADER_CODE:
1197                 case EFI_LOADER_DATA:
1198                 case EFI_BOOT_SERVICES_CODE:
1199                 case EFI_BOOT_SERVICES_DATA:
1200                 case EFI_CONVENTIONAL_MEMORY:
1201                         e820_type = E820_RAM;
1202                         break;
1203
1204                 case EFI_ACPI_MEMORY_NVS:
1205                         e820_type = E820_NVS;
1206                         break;
1207
1208                 default:
1209                         continue;
1210                 }
1211
1212                 /* Merge adjacent mappings */
1213                 if (prev && prev->type == e820_type &&
1214                     (prev->addr + prev->size) == d->phys_addr) {
1215                         prev->size += d->num_pages << 12;
1216                         continue;
1217                 }
1218
1219                 if (nr_entries == ARRAY_SIZE(params->e820_map)) {
1220                         u32 need = (nr_desc - i) * sizeof(struct e820entry) +
1221                                    sizeof(struct setup_data);
1222
1223                         if (!e820ext || e820ext_size < need)
1224                                 return EFI_BUFFER_TOO_SMALL;
1225
1226                         /* boot_params map full, switch to e820 extended */
1227                         e820_map = (struct e820entry *)e820ext->data;
1228                 }
1229
1230                 e820_map->addr = d->phys_addr;
1231                 e820_map->size = d->num_pages << PAGE_SHIFT;
1232                 e820_map->type = e820_type;
1233                 prev = e820_map++;
1234                 nr_entries++;
1235         }
1236
1237         if (nr_entries > ARRAY_SIZE(params->e820_map)) {
1238                 u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_map);
1239
1240                 add_e820ext(params, e820ext, nr_e820ext);
1241                 nr_entries -= nr_e820ext;
1242         }
1243
1244         params->e820_entries = (u8)nr_entries;
1245
1246         return EFI_SUCCESS;
1247 }
1248
1249 static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext,
1250                                   u32 *e820ext_size)
1251 {
1252         efi_status_t status;
1253         unsigned long size;
1254
1255         size = sizeof(struct setup_data) +
1256                 sizeof(struct e820entry) * nr_desc;
1257
1258         if (*e820ext) {
1259                 efi_call_early(free_pool, *e820ext);
1260                 *e820ext = NULL;
1261                 *e820ext_size = 0;
1262         }
1263
1264         status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
1265                                 size, (void **)e820ext);
1266         if (status == EFI_SUCCESS)
1267                 *e820ext_size = size;
1268
1269         return status;
1270 }
1271
1272 static efi_status_t exit_boot(struct boot_params *boot_params,
1273                               void *handle, bool is64)
1274 {
1275         struct efi_info *efi = &boot_params->efi_info;
1276         unsigned long map_sz, key, desc_size;
1277         efi_memory_desc_t *mem_map;
1278         struct setup_data *e820ext;
1279         const char *signature;
1280         __u32 e820ext_size;
1281         __u32 nr_desc, prev_nr_desc;
1282         efi_status_t status;
1283         __u32 desc_version;
1284         bool called_exit = false;
1285         u8 nr_entries;
1286         int i;
1287
1288         nr_desc = 0;
1289         e820ext = NULL;
1290         e820ext_size = 0;
1291
1292 get_map:
1293         status = efi_get_memory_map(sys_table, &mem_map, &map_sz, &desc_size,
1294                                     &desc_version, &key);
1295
1296         if (status != EFI_SUCCESS)
1297                 return status;
1298
1299         prev_nr_desc = nr_desc;
1300         nr_desc = map_sz / desc_size;
1301         if (nr_desc > prev_nr_desc &&
1302             nr_desc > ARRAY_SIZE(boot_params->e820_map)) {
1303                 u32 nr_e820ext = nr_desc - ARRAY_SIZE(boot_params->e820_map);
1304
1305                 status = alloc_e820ext(nr_e820ext, &e820ext, &e820ext_size);
1306                 if (status != EFI_SUCCESS)
1307                         goto free_mem_map;
1308
1309                 efi_call_early(free_pool, mem_map);
1310                 goto get_map; /* Allocated memory, get map again */
1311         }
1312
1313         signature = is64 ? EFI64_LOADER_SIGNATURE : EFI32_LOADER_SIGNATURE;
1314         memcpy(&efi->efi_loader_signature, signature, sizeof(__u32));
1315
1316         efi->efi_systab = (unsigned long)sys_table;
1317         efi->efi_memdesc_size = desc_size;
1318         efi->efi_memdesc_version = desc_version;
1319         efi->efi_memmap = (unsigned long)mem_map;
1320         efi->efi_memmap_size = map_sz;
1321
1322 #ifdef CONFIG_X86_64
1323         efi->efi_systab_hi = (unsigned long)sys_table >> 32;
1324         efi->efi_memmap_hi = (unsigned long)mem_map >> 32;
1325 #endif
1326
1327         /* Might as well exit boot services now */
1328         status = efi_call_early(exit_boot_services, handle, key);
1329         if (status != EFI_SUCCESS) {
1330                 /*
1331                  * ExitBootServices() will fail if any of the event
1332                  * handlers change the memory map. In which case, we
1333                  * must be prepared to retry, but only once so that
1334                  * we're guaranteed to exit on repeated failures instead
1335                  * of spinning forever.
1336                  */
1337                 if (called_exit)
1338                         goto free_mem_map;
1339
1340                 called_exit = true;
1341                 efi_call_early(free_pool, mem_map);
1342                 goto get_map;
1343         }
1344
1345         /* Historic? */
1346         boot_params->alt_mem_k = 32 * 1024;
1347
1348         status = setup_e820(boot_params, e820ext, e820ext_size);
1349         if (status != EFI_SUCCESS)
1350                 return status;
1351
1352         return EFI_SUCCESS;
1353
1354 free_mem_map:
1355         efi_call_early(free_pool, mem_map);
1356         return status;
1357 }
1358
1359 /*
1360  * On success we return a pointer to a boot_params structure, and NULL
1361  * on failure.
1362  */
1363 struct boot_params *efi_main(struct efi_config *c,
1364                              struct boot_params *boot_params)
1365 {
1366         struct desc_ptr *gdt = NULL;
1367         efi_loaded_image_t *image;
1368         struct setup_header *hdr = &boot_params->hdr;
1369         efi_status_t status;
1370         struct desc_struct *desc;
1371         void *handle;
1372         efi_system_table_t *_table;
1373         bool is64;
1374
1375         efi_early = c;
1376
1377         _table = (efi_system_table_t *)(unsigned long)efi_early->table;
1378         handle = (void *)(unsigned long)efi_early->image_handle;
1379         is64 = efi_early->is64;
1380
1381         sys_table = _table;
1382
1383         /* Check if we were booted by the EFI firmware */
1384         if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
1385                 goto fail;
1386
1387         if (is64)
1388                 setup_boot_services64(efi_early);
1389         else
1390                 setup_boot_services32(efi_early);
1391
1392         setup_graphics(boot_params);
1393
1394         setup_efi_pci(boot_params);
1395
1396         status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
1397                                 sizeof(*gdt), (void **)&gdt);
1398         if (status != EFI_SUCCESS) {
1399                 efi_printk(sys_table, "Failed to alloc mem for gdt structure\n");
1400                 goto fail;
1401         }
1402
1403         gdt->size = 0x800;
1404         status = efi_low_alloc(sys_table, gdt->size, 8,
1405                            (unsigned long *)&gdt->address);
1406         if (status != EFI_SUCCESS) {
1407                 efi_printk(sys_table, "Failed to alloc mem for gdt\n");
1408                 goto fail;
1409         }
1410
1411         /*
1412          * If the kernel isn't already loaded at the preferred load
1413          * address, relocate it.
1414          */
1415         if (hdr->pref_address != hdr->code32_start) {
1416                 unsigned long bzimage_addr = hdr->code32_start;
1417                 status = efi_relocate_kernel(sys_table, &bzimage_addr,
1418                                              hdr->init_size, hdr->init_size,
1419                                              hdr->pref_address,
1420                                              hdr->kernel_alignment);
1421                 if (status != EFI_SUCCESS) {
1422                         efi_printk(sys_table, "efi_relocate_kernel() failed!\n");
1423                         goto fail;
1424                 }
1425
1426                 hdr->pref_address = hdr->code32_start;
1427                 hdr->code32_start = bzimage_addr;
1428         }
1429
1430         status = exit_boot(boot_params, handle, is64);
1431         if (status != EFI_SUCCESS) {
1432                 efi_printk(sys_table, "exit_boot() failed!\n");
1433                 goto fail;
1434         }
1435
1436         memset((char *)gdt->address, 0x0, gdt->size);
1437         desc = (struct desc_struct *)gdt->address;
1438
1439         /* The first GDT is a dummy and the second is unused. */
1440         desc += 2;
1441
1442         desc->limit0 = 0xffff;
1443         desc->base0 = 0x0000;
1444         desc->base1 = 0x0000;
1445         desc->type = SEG_TYPE_CODE | SEG_TYPE_EXEC_READ;
1446         desc->s = DESC_TYPE_CODE_DATA;
1447         desc->dpl = 0;
1448         desc->p = 1;
1449         desc->limit = 0xf;
1450         desc->avl = 0;
1451         desc->l = 0;
1452         desc->d = SEG_OP_SIZE_32BIT;
1453         desc->g = SEG_GRANULARITY_4KB;
1454         desc->base2 = 0x00;
1455
1456         desc++;
1457         desc->limit0 = 0xffff;
1458         desc->base0 = 0x0000;
1459         desc->base1 = 0x0000;
1460         desc->type = SEG_TYPE_DATA | SEG_TYPE_READ_WRITE;
1461         desc->s = DESC_TYPE_CODE_DATA;
1462         desc->dpl = 0;
1463         desc->p = 1;
1464         desc->limit = 0xf;
1465         desc->avl = 0;
1466         desc->l = 0;
1467         desc->d = SEG_OP_SIZE_32BIT;
1468         desc->g = SEG_GRANULARITY_4KB;
1469         desc->base2 = 0x00;
1470
1471 #ifdef CONFIG_X86_64
1472         /* Task segment value */
1473         desc++;
1474         desc->limit0 = 0x0000;
1475         desc->base0 = 0x0000;
1476         desc->base1 = 0x0000;
1477         desc->type = SEG_TYPE_TSS;
1478         desc->s = 0;
1479         desc->dpl = 0;
1480         desc->p = 1;
1481         desc->limit = 0x0;
1482         desc->avl = 0;
1483         desc->l = 0;
1484         desc->d = 0;
1485         desc->g = SEG_GRANULARITY_4KB;
1486         desc->base2 = 0x00;
1487 #endif /* CONFIG_X86_64 */
1488
1489         asm volatile("cli");
1490         asm volatile ("lgdt %0" : : "m" (*gdt));
1491
1492         return boot_params;
1493 fail:
1494         efi_printk(sys_table, "efi_main() failed!\n");
1495         return NULL;
1496 }