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 #include "../string.h"
  17 #include "eboot.h"
  18
  19 static efi_system_table_t *sys_table;
  20
  21 static struct efi_config *efi_early;
  22
  23 __pure const struct efi_config *__efi_early(void)
  24 {
  25         return efi_early;
  26 }
  27
  28 #define BOOT_SERVICES(bits)                                             \
  29 static void setup_boot_services##bits(struct efi_config *c)             \
  30 {                                                                       \
  31         efi_system_table_##bits##_t *table;                             \
  32         efi_boot_services_##bits##_t *bt;                               \
  33                                                                         \
  34         table = (typeof(table))sys_table;                               \
  35                                                                         \
  36         c->text_output = table->con_out;                                \
  37                                                                         \
  38         bt = (typeof(bt))(unsigned long)(table->boottime);              \
  39                                                                         \
  40         c->allocate_pool = bt->allocate_pool;                           \
  41         c->allocate_pages = bt->allocate_pages;                         \
  42         c->get_memory_map = bt->get_memory_map;                         \
  43         c->free_pool = bt->free_pool;                                   \
  44         c->free_pages = bt->free_pages;                                 \
  45         c->locate_handle = bt->locate_handle;                           \
  46         c->handle_protocol = bt->handle_protocol;                       \
  47         c->exit_boot_services = bt->exit_boot_services;                 \
  48 }
  49 BOOT_SERVICES(32);
  50 BOOT_SERVICES(64);
  51
  52 void efi_char16_printk(efi_system_table_t *, efi_char16_t *);
  53
  54 static efi_status_t
  55 __file_size32(void *__fh, efi_char16_t *filename_16,
  56               void **handle, u64 *file_sz)
  57 {
  58         efi_file_handle_32_t *h, *fh = __fh;
  59         efi_file_info_t *info;
  60         efi_status_t status;
  61         efi_guid_t info_guid = EFI_FILE_INFO_ID;
  62         u32 info_sz;
  63
  64         status = efi_early->call((unsigned long)fh->open, fh, &h, filename_16,
  65                                  EFI_FILE_MODE_READ, (u64)0);
  66         if (status != EFI_SUCCESS) {
  67                 efi_printk(sys_table, "Failed to open file: ");
  68                 efi_char16_printk(sys_table, filename_16);
  69                 efi_printk(sys_table, "\n");
  70                 return status;
  71         }
  72
  73         *handle = h;
  74
  75         info_sz = 0;
  76         status = efi_early->call((unsigned long)h->get_info, h, &info_guid,
  77                                  &info_sz, NULL);
  78         if (status != EFI_BUFFER_TOO_SMALL) {
  79                 efi_printk(sys_table, "Failed to get file info size\n");
  80                 return status;
  81         }
  82
  83 grow:
  84         status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
  85                                 info_sz, (void **)&info);
  86         if (status != EFI_SUCCESS) {
  87                 efi_printk(sys_table, "Failed to alloc mem for file info\n");
  88                 return status;
  89         }
  90
  91         status = efi_early->call((unsigned long)h->get_info, h, &info_guid,
  92                                  &info_sz, info);
  93         if (status == EFI_BUFFER_TOO_SMALL) {
  94                 efi_call_early(free_pool, info);
  95                 goto grow;
  96         }
  97
  98         *file_sz = info->file_size;
  99         efi_call_early(free_pool, info);
 100
 101         if (status != EFI_SUCCESS)
 102                 efi_printk(sys_table, "Failed to get initrd info\n");
 103
 104         return status;
 105 }
 106
 107 static efi_status_t
 108 __file_size64(void *__fh, efi_char16_t *filename_16,
 109               void **handle, u64 *file_sz)
 110 {
 111         efi_file_handle_64_t *h, *fh = __fh;
 112         efi_file_info_t *info;
 113         efi_status_t status;
 114         efi_guid_t info_guid = EFI_FILE_INFO_ID;
 115         u64 info_sz;
 116
 117         status = efi_early->call((unsigned long)fh->open, fh, &h, filename_16,
 118                                  EFI_FILE_MODE_READ, (u64)0);
 119         if (status != EFI_SUCCESS) {
 120                 efi_printk(sys_table, "Failed to open file: ");
 121                 efi_char16_printk(sys_table, filename_16);
 122                 efi_printk(sys_table, "\n");
 123                 return status;
 124         }
 125
 126         *handle = h;
 127
 128         info_sz = 0;
 129         status = efi_early->call((unsigned long)h->get_info, h, &info_guid,
 130                                  &info_sz, NULL);
 131         if (status != EFI_BUFFER_TOO_SMALL) {
 132                 efi_printk(sys_table, "Failed to get file info size\n");
 133                 return status;
 134         }
 135
 136 grow:
 137         status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
 138                                 info_sz, (void **)&info);
 139         if (status != EFI_SUCCESS) {
 140                 efi_printk(sys_table, "Failed to alloc mem for file info\n");
 141                 return status;
 142         }
 143
 144         status = efi_early->call((unsigned long)h->get_info, h, &info_guid,
 145                                  &info_sz, info);
 146         if (status == EFI_BUFFER_TOO_SMALL) {
 147                 efi_call_early(free_pool, info);
 148                 goto grow;
 149         }
 150
 151         *file_sz = info->file_size;
 152         efi_call_early(free_pool, info);
 153
 154         if (status != EFI_SUCCESS)
 155                 efi_printk(sys_table, "Failed to get initrd info\n");
 156
 157         return status;
 158 }
 159 efi_status_t
 160 efi_file_size(efi_system_table_t *sys_table, void *__fh,
 161               efi_char16_t *filename_16, void **handle, u64 *file_sz)
 162 {
 163         if (efi_early->is64)
 164                 return __file_size64(__fh, filename_16, handle, file_sz);
 165
 166         return __file_size32(__fh, filename_16, handle, file_sz);
 167 }
 168
 169 efi_status_t
 170 efi_file_read(void *handle, unsigned long *size, void *addr)
 171 {
 172         unsigned long func;
 173
 174         if (efi_early->is64) {
 175                 efi_file_handle_64_t *fh = handle;
 176
 177                 func = (unsigned long)fh->read;
 178                 return efi_early->call(func, handle, size, addr);
 179         } else {
 180                 efi_file_handle_32_t *fh = handle;
 181
 182                 func = (unsigned long)fh->read;
 183                 return efi_early->call(func, handle, size, addr);
 184         }
 185 }
 186
 187 efi_status_t efi_file_close(void *handle)
 188 {
 189         if (efi_early->is64) {
 190                 efi_file_handle_64_t *fh = handle;
 191
 192                 return efi_early->call((unsigned long)fh->close, handle);
 193         } else {
 194                 efi_file_handle_32_t *fh = handle;
 195
 196                 return efi_early->call((unsigned long)fh->close, handle);
 197         }
 198 }
 199
 200 static inline efi_status_t __open_volume32(void *__image, void **__fh)
 201 {
 202         efi_file_io_interface_t *io;
 203         efi_loaded_image_32_t *image = __image;
 204         efi_file_handle_32_t *fh;
 205         efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
 206         efi_status_t status;
 207         void *handle = (void *)(unsigned long)image->device_handle;
 208         unsigned long func;
 209
 210         status = efi_call_early(handle_protocol, handle,
 211                                 &fs_proto, (void **)&io);
 212         if (status != EFI_SUCCESS) {
 213                 efi_printk(sys_table, "Failed to handle fs_proto\n");
 214                 return status;
 215         }
 216
 217         func = (unsigned long)io->open_volume;
 218         status = efi_early->call(func, io, &fh);
 219         if (status != EFI_SUCCESS)
 220                 efi_printk(sys_table, "Failed to open volume\n");
 221
 222         *__fh = fh;
 223         return status;
 224 }
 225
 226 static inline efi_status_t __open_volume64(void *__image, void **__fh)
 227 {
 228         efi_file_io_interface_t *io;
 229         efi_loaded_image_64_t *image = __image;
 230         efi_file_handle_64_t *fh;
 231         efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
 232         efi_status_t status;
 233         void *handle = (void *)(unsigned long)image->device_handle;
 234         unsigned long func;
 235
 236         status = efi_call_early(handle_protocol, handle,
 237                                 &fs_proto, (void **)&io);
 238         if (status != EFI_SUCCESS) {
 239                 efi_printk(sys_table, "Failed to handle fs_proto\n");
 240                 return status;
 241         }
 242
 243         func = (unsigned long)io->open_volume;
 244         status = efi_early->call(func, io, &fh);
 245         if (status != EFI_SUCCESS)
 246                 efi_printk(sys_table, "Failed to open volume\n");
 247
 248         *__fh = fh;
 249         return status;
 250 }
 251
 252 efi_status_t
 253 efi_open_volume(efi_system_table_t *sys_table, void *__image, void **__fh)
 254 {
 255         if (efi_early->is64)
 256                 return __open_volume64(__image, __fh);
 257
 258         return __open_volume32(__image, __fh);
 259 }
 260
 261 void efi_char16_printk(efi_system_table_t *table, efi_char16_t *str)
 262 {
 263         unsigned long output_string;
 264         size_t offset;
 265
 266         if (efi_early->is64) {
 267                 struct efi_simple_text_output_protocol_64 *out;
 268                 u64 *func;
 269
 270                 offset = offsetof(typeof(*out), output_string);
 271                 output_string = efi_early->text_output + offset;
 272                 out = (typeof(out))(unsigned long)efi_early->text_output;
 273                 func = (u64 *)output_string;
 274
 275                 efi_early->call(*func, out, str);
 276         } else {
 277                 struct efi_simple_text_output_protocol_32 *out;
 278                 u32 *func;
 279
 280                 offset = offsetof(typeof(*out), output_string);
 281                 output_string = efi_early->text_output + offset;
 282                 out = (typeof(out))(unsigned long)efi_early->text_output;
 283                 func = (u32 *)output_string;
 284
 285                 efi_early->call(*func, out, str);
 286         }
 287 }
 288
 289 static void find_bits(unsigned long mask, u8 *pos, u8 *size)
 290 {
 291         u8 first, len;
 292
 293         first = 0;
 294         len = 0;
 295
 296         if (mask) {
 297                 while (!(mask & 0x1)) {
 298                         mask = mask >> 1;
 299                         first++;
 300                 }
 301
 302                 while (mask & 0x1) {
 303                         mask = mask >> 1;
 304                         len++;
 305                 }
 306         }
 307
 308         *pos = first;
 309         *size = len;
 310 }
 311
 312 static efi_status_t
 313 __setup_efi_pci32(efi_pci_io_protocol_32 *pci, struct pci_setup_rom **__rom)
 314 {
 315         struct pci_setup_rom *rom = NULL;
 316         efi_status_t status;
 317         unsigned long size;
 318         uint64_t attributes;
 319
 320         status = efi_early->call(pci->attributes, pci,
 321                                  EfiPciIoAttributeOperationGet, 0, 0,
 322                                  &attributes);
 323         if (status != EFI_SUCCESS)
 324                 return status;
 325
 326         if (!pci->romimage || !pci->romsize)
 327                 return EFI_INVALID_PARAMETER;
 328
 329         size = pci->romsize + sizeof(*rom);
 330
 331         status = efi_call_early(allocate_pool, EFI_LOADER_DATA, size, &rom);
 332         if (status != EFI_SUCCESS) {
 333                 efi_printk(sys_table, "Failed to alloc mem for rom\n");
 334                 return status;
 335         }
 336
 337         memset(rom, 0, sizeof(*rom));
 338
 339         rom->data.type = SETUP_PCI;
 340         rom->data.len = size - sizeof(struct setup_data);
 341         rom->data.next = 0;
 342         rom->pcilen = pci->romsize;
 343         *__rom = rom;
 344
 345         status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
 346                                  PCI_VENDOR_ID, 1, &(rom->vendor));
 347
 348         if (status != EFI_SUCCESS) {
 349                 efi_printk(sys_table, "Failed to read rom->vendor\n");
 350                 goto free_struct;
 351         }
 352
 353         status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
 354                                  PCI_DEVICE_ID, 1, &(rom->devid));
 355
 356         if (status != EFI_SUCCESS) {
 357                 efi_printk(sys_table, "Failed to read rom->devid\n");
 358                 goto free_struct;
 359         }
 360
 361         status = efi_early->call(pci->get_location, pci, &(rom->segment),
 362                                  &(rom->bus), &(rom->device), &(rom->function));
 363
 364         if (status != EFI_SUCCESS)
 365                 goto free_struct;
 366
 367         memcpy(rom->romdata, pci->romimage, pci->romsize);
 368         return status;
 369
 370 free_struct:
 371         efi_call_early(free_pool, rom);
 372         return status;
 373 }
 374
 375 static void
 376 setup_efi_pci32(struct boot_params *params, void **pci_handle,
 377                 unsigned long size)
 378 {
 379         efi_pci_io_protocol_32 *pci = NULL;
 380         efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
 381         u32 *handles = (u32 *)(unsigned long)pci_handle;
 382         efi_status_t status;
 383         unsigned long nr_pci;
 384         struct setup_data *data;
 385         int i;
 386
 387         data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
 388
 389         while (data && data->next)
 390                 data = (struct setup_data *)(unsigned long)data->next;
 391
 392         nr_pci = size / sizeof(u32);
 393         for (i = 0; i < nr_pci; i++) {
 394                 struct pci_setup_rom *rom = NULL;
 395                 u32 h = handles[i];
 396
 397                 status = efi_call_early(handle_protocol, h,
 398                                         &pci_proto, (void **)&pci);
 399
 400                 if (status != EFI_SUCCESS)
 401                         continue;
 402
 403                 if (!pci)
 404                         continue;
 405
 406                 status = __setup_efi_pci32(pci, &rom);
 407                 if (status != EFI_SUCCESS)
 408                         continue;
 409
 410                 if (data)
 411                         data->next = (unsigned long)rom;
 412                 else
 413                         params->hdr.setup_data = (unsigned long)rom;
 414
 415                 data = (struct setup_data *)rom;
 416
 417         }
 418 }
 419
 420 static efi_status_t
 421 __setup_efi_pci64(efi_pci_io_protocol_64 *pci, struct pci_setup_rom **__rom)
 422 {
 423         struct pci_setup_rom *rom;
 424         efi_status_t status;
 425         unsigned long size;
 426         uint64_t attributes;
 427
 428         status = efi_early->call(pci->attributes, pci,
 429                                  EfiPciIoAttributeOperationGet, 0,
 430                                  &attributes);
 431         if (status != EFI_SUCCESS)
 432                 return status;
 433
 434         if (!pci->romimage || !pci->romsize)
 435                 return EFI_INVALID_PARAMETER;
 436
 437         size = pci->romsize + sizeof(*rom);
 438
 439         status = efi_call_early(allocate_pool, EFI_LOADER_DATA, size, &rom);
 440         if (status != EFI_SUCCESS) {
 441                 efi_printk(sys_table, "Failed to alloc mem for rom\n");
 442                 return status;
 443         }
 444
 445         rom->data.type = SETUP_PCI;
 446         rom->data.len = size - sizeof(struct setup_data);
 447         rom->data.next = 0;
 448         rom->pcilen = pci->romsize;
 449         *__rom = rom;
 450
 451         status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
 452                                  PCI_VENDOR_ID, 1, &(rom->vendor));
 453
 454         if (status != EFI_SUCCESS) {
 455                 efi_printk(sys_table, "Failed to read rom->vendor\n");
 456                 goto free_struct;
 457         }
 458
 459         status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
 460                                  PCI_DEVICE_ID, 1, &(rom->devid));
 461
 462         if (status != EFI_SUCCESS) {
 463                 efi_printk(sys_table, "Failed to read rom->devid\n");
 464                 goto free_struct;
 465         }
 466
 467         status = efi_early->call(pci->get_location, pci, &(rom->segment),
 468                                  &(rom->bus), &(rom->device), &(rom->function));
 469
 470         if (status != EFI_SUCCESS)
 471                 goto free_struct;
 472
 473         memcpy(rom->romdata, pci->romimage, pci->romsize);
 474         return status;
 475
 476 free_struct:
 477         efi_call_early(free_pool, rom);
 478         return status;
 479
 480 }
 481
 482 static void
 483 setup_efi_pci64(struct boot_params *params, void **pci_handle,
 484                 unsigned long size)
 485 {
 486         efi_pci_io_protocol_64 *pci = NULL;
 487         efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
 488         u64 *handles = (u64 *)(unsigned long)pci_handle;
 489         efi_status_t status;
 490         unsigned long nr_pci;
 491         struct setup_data *data;
 492         int i;
 493
 494         data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
 495
 496         while (data && data->next)
 497                 data = (struct setup_data *)(unsigned long)data->next;
 498
 499         nr_pci = size / sizeof(u64);
 500         for (i = 0; i < nr_pci; i++) {
 501                 struct pci_setup_rom *rom = NULL;
 502                 u64 h = handles[i];
 503
 504                 status = efi_call_early(handle_protocol, h,
 505                                         &pci_proto, (void **)&pci);
 506
 507                 if (status != EFI_SUCCESS)
 508                         continue;
 509
 510                 if (!pci)
 511                         continue;
 512
 513                 status = __setup_efi_pci64(pci, &rom);
 514                 if (status != EFI_SUCCESS)
 515                         continue;
 516
 517                 if (data)
 518                         data->next = (unsigned long)rom;
 519                 else
 520                         params->hdr.setup_data = (unsigned long)rom;
 521
 522                 data = (struct setup_data *)rom;
 523
 524         }
 525 }
 526
 527 /*
 528  * There's no way to return an informative status from this function,
 529  * because any analysis (and printing of error messages) needs to be
 530  * done directly at the EFI function call-site.
 531  *
 532  * For example, EFI_INVALID_PARAMETER could indicate a bug or maybe we
 533  * just didn't find any PCI devices, but there's no way to tell outside
 534  * the context of the call.
 535  */
 536 static void setup_efi_pci(struct boot_params *params)
 537 {
 538         efi_status_t status;
 539         void **pci_handle = NULL;
 540         efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
 541         unsigned long size = 0;
 542
 543         status = efi_call_early(locate_handle,
 544                                 EFI_LOCATE_BY_PROTOCOL,
 545                                 &pci_proto, NULL, &size, pci_handle);
 546
 547         if (status == EFI_BUFFER_TOO_SMALL) {
 548                 status = efi_call_early(allocate_pool,
 549                                         EFI_LOADER_DATA,
 550                                         size, (void **)&pci_handle);
 551
 552                 if (status != EFI_SUCCESS) {
 553                         efi_printk(sys_table, "Failed to alloc mem for pci_handle\n");
 554                         return;
 555                 }
 556
 557                 status = efi_call_early(locate_handle,
 558                                         EFI_LOCATE_BY_PROTOCOL, &pci_proto,
 559                                         NULL, &size, pci_handle);
 560         }
 561
 562         if (status != EFI_SUCCESS)
 563                 goto free_handle;
 564
 565         if (efi_early->is64)
 566                 setup_efi_pci64(params, pci_handle, size);
 567         else
 568                 setup_efi_pci32(params, pci_handle, size);
 569
 570 free_handle:
 571         efi_call_early(free_pool, pci_handle);
 572 }
 573
 574 static void
 575 setup_pixel_info(struct screen_info *si, u32 pixels_per_scan_line,
 576                  struct efi_pixel_bitmask pixel_info, int pixel_format)
 577 {
 578         if (pixel_format == PIXEL_RGB_RESERVED_8BIT_PER_COLOR) {
 579                 si->lfb_depth = 32;
 580                 si->lfb_linelength = pixels_per_scan_line * 4;
 581                 si->red_size = 8;
 582                 si->red_pos = 0;
 583                 si->green_size = 8;
 584                 si->green_pos = 8;
 585                 si->blue_size = 8;
 586                 si->blue_pos = 16;
 587                 si->rsvd_size = 8;
 588                 si->rsvd_pos = 24;
 589         } else if (pixel_format == PIXEL_BGR_RESERVED_8BIT_PER_COLOR) {
 590                 si->lfb_depth = 32;
 591                 si->lfb_linelength = pixels_per_scan_line * 4;
 592                 si->red_size = 8;
 593                 si->red_pos = 16;
 594                 si->green_size = 8;
 595                 si->green_pos = 8;
 596                 si->blue_size = 8;
 597                 si->blue_pos = 0;
 598                 si->rsvd_size = 8;
 599                 si->rsvd_pos = 24;
 600         } else if (pixel_format == PIXEL_BIT_MASK) {
 601                 find_bits(pixel_info.red_mask, &si->red_pos, &si->red_size);
 602                 find_bits(pixel_info.green_mask, &si->green_pos,
 603                           &si->green_size);
 604                 find_bits(pixel_info.blue_mask, &si->blue_pos, &si->blue_size);
 605                 find_bits(pixel_info.reserved_mask, &si->rsvd_pos,
 606                           &si->rsvd_size);
 607                 si->lfb_depth = si->red_size + si->green_size +
 608                         si->blue_size + si->rsvd_size;
 609                 si->lfb_linelength = (pixels_per_scan_line * si->lfb_depth) / 8;
 610         } else {
 611                 si->lfb_depth = 4;
 612                 si->lfb_linelength = si->lfb_width / 2;
 613                 si->red_size = 0;
 614                 si->red_pos = 0;
 615                 si->green_size = 0;
 616                 si->green_pos = 0;
 617                 si->blue_size = 0;
 618                 si->blue_pos = 0;
 619                 si->rsvd_size = 0;
 620                 si->rsvd_pos = 0;
 621         }
 622 }
 623
 624 static efi_status_t
 625 __gop_query32(struct efi_graphics_output_protocol_32 *gop32,
 626               struct efi_graphics_output_mode_info **info,
 627               unsigned long *size, u64 *fb_base)
 628 {
 629         struct efi_graphics_output_protocol_mode_32 *mode;
 630         efi_status_t status;
 631         unsigned long m;
 632
 633         m = gop32->mode;
 634         mode = (struct efi_graphics_output_protocol_mode_32 *)m;
 635
 636         status = efi_early->call(gop32->query_mode, gop32,
 637                                  mode->mode, size, info);
 638         if (status != EFI_SUCCESS)
 639                 return status;
 640
 641         *fb_base = mode->frame_buffer_base;
 642         return status;
 643 }
 644
 645 static efi_status_t
 646 setup_gop32(struct screen_info *si, efi_guid_t *proto,
 647             unsigned long size, void **gop_handle)
 648 {
 649         struct efi_graphics_output_protocol_32 *gop32, *first_gop;
 650         unsigned long nr_gops;
 651         u16 width, height;
 652         u32 pixels_per_scan_line;
 653         u32 ext_lfb_base;
 654         u64 fb_base;
 655         struct efi_pixel_bitmask pixel_info;
 656         int pixel_format;
 657         efi_status_t status;
 658         u32 *handles = (u32 *)(unsigned long)gop_handle;
 659         int i;
 660
 661         first_gop = NULL;
 662         gop32 = NULL;
 663
 664         nr_gops = size / sizeof(u32);
 665         for (i = 0; i < nr_gops; i++) {
 666                 struct efi_graphics_output_mode_info *info = NULL;
 667                 efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
 668                 bool conout_found = false;
 669                 void *dummy = NULL;
 670                 u32 h = handles[i];
 671                 u64 current_fb_base;
 672
 673                 status = efi_call_early(handle_protocol, h,
 674                                         proto, (void **)&gop32);
 675                 if (status != EFI_SUCCESS)
 676                         continue;
 677
 678                 status = efi_call_early(handle_protocol, h,
 679                                         &conout_proto, &dummy);
 680                 if (status == EFI_SUCCESS)
 681                         conout_found = true;
 682
 683                 status = __gop_query32(gop32, &info, &size, &current_fb_base);
 684                 if (status == EFI_SUCCESS && (!first_gop || conout_found)) {
 685                         /*
 686                          * Systems that use the UEFI Console Splitter may
 687                          * provide multiple GOP devices, not all of which are
 688                          * backed by real hardware. The workaround is to search
 689                          * for a GOP implementing the ConOut protocol, and if
 690                          * one isn't found, to just fall back to the first GOP.
 691                          */
 692                         width = info->horizontal_resolution;
 693                         height = info->vertical_resolution;
 694                         pixel_format = info->pixel_format;
 695                         pixel_info = info->pixel_information;
 696                         pixels_per_scan_line = info->pixels_per_scan_line;
 697                         fb_base = current_fb_base;
 698
 699                         /*
 700                          * Once we've found a GOP supporting ConOut,
 701                          * don't bother looking any further.
 702                          */
 703                         first_gop = gop32;
 704                         if (conout_found)
 705                                 break;
 706                 }
 707         }
 708
 709         /* Did we find any GOPs? */
 710         if (!first_gop)
 711                 goto out;
 712
 713         /* EFI framebuffer */
 714         si->orig_video_isVGA = VIDEO_TYPE_EFI;
 715
 716         si->lfb_width = width;
 717         si->lfb_height = height;
 718         si->lfb_base = fb_base;
 719
 720         ext_lfb_base = (u64)(unsigned long)fb_base >> 32;
 721         if (ext_lfb_base) {
 722                 si->capabilities |= VIDEO_CAPABILITY_64BIT_BASE;
 723                 si->ext_lfb_base = ext_lfb_base;
 724         }
 725
 726         si->pages = 1;
 727
 728         setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format);
 729
 730         si->lfb_size = si->lfb_linelength * si->lfb_height;
 731
 732         si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
 733 out:
 734         return status;
 735 }
 736
 737 static efi_status_t
 738 __gop_query64(struct efi_graphics_output_protocol_64 *gop64,
 739               struct efi_graphics_output_mode_info **info,
 740               unsigned long *size, u64 *fb_base)
 741 {
 742         struct efi_graphics_output_protocol_mode_64 *mode;
 743         efi_status_t status;
 744         unsigned long m;
 745
 746         m = gop64->mode;
 747         mode = (struct efi_graphics_output_protocol_mode_64 *)m;
 748
 749         status = efi_early->call(gop64->query_mode, gop64,
 750                                  mode->mode, size, info);
 751         if (status != EFI_SUCCESS)
 752                 return status;
 753
 754         *fb_base = mode->frame_buffer_base;
 755         return status;
 756 }
 757
 758 static efi_status_t
 759 setup_gop64(struct screen_info *si, efi_guid_t *proto,
 760             unsigned long size, void **gop_handle)
 761 {
 762         struct efi_graphics_output_protocol_64 *gop64, *first_gop;
 763         unsigned long nr_gops;
 764         u16 width, height;
 765         u32 pixels_per_scan_line;
 766         u32 ext_lfb_base;
 767         u64 fb_base;
 768         struct efi_pixel_bitmask pixel_info;
 769         int pixel_format;
 770         efi_status_t status;
 771         u64 *handles = (u64 *)(unsigned long)gop_handle;
 772         int i;
 773
 774         first_gop = NULL;
 775         gop64 = NULL;
 776
 777         nr_gops = size / sizeof(u64);
 778         for (i = 0; i < nr_gops; i++) {
 779                 struct efi_graphics_output_mode_info *info = NULL;
 780                 efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
 781                 bool conout_found = false;
 782                 void *dummy = NULL;
 783                 u64 h = handles[i];
 784                 u64 current_fb_base;
 785
 786                 status = efi_call_early(handle_protocol, h,
 787                                         proto, (void **)&gop64);
 788                 if (status != EFI_SUCCESS)
 789                         continue;
 790
 791                 status = efi_call_early(handle_protocol, h,
 792                                         &conout_proto, &dummy);
 793                 if (status == EFI_SUCCESS)
 794                         conout_found = true;
 795
 796                 status = __gop_query64(gop64, &info, &size, &current_fb_base);
 797                 if (status == EFI_SUCCESS && (!first_gop || conout_found)) {
 798                         /*
 799                          * Systems that use the UEFI Console Splitter may
 800                          * provide multiple GOP devices, not all of which are
 801                          * backed by real hardware. The workaround is to search
 802                          * for a GOP implementing the ConOut protocol, and if
 803                          * one isn't found, to just fall back to the first GOP.
 804                          */
 805                         width = info->horizontal_resolution;
 806                         height = info->vertical_resolution;
 807                         pixel_format = info->pixel_format;
 808                         pixel_info = info->pixel_information;
 809                         pixels_per_scan_line = info->pixels_per_scan_line;
 810                         fb_base = current_fb_base;
 811
 812                         /*
 813                          * Once we've found a GOP supporting ConOut,
 814                          * don't bother looking any further.
 815                          */
 816                         first_gop = gop64;
 817                         if (conout_found)
 818                                 break;
 819                 }
 820         }
 821
 822         /* Did we find any GOPs? */
 823         if (!first_gop)
 824                 goto out;
 825
 826         /* EFI framebuffer */
 827         si->orig_video_isVGA = VIDEO_TYPE_EFI;
 828
 829         si->lfb_width = width;
 830         si->lfb_height = height;
 831         si->lfb_base = fb_base;
 832
 833         ext_lfb_base = (u64)(unsigned long)fb_base >> 32;
 834         if (ext_lfb_base) {
 835                 si->capabilities |= VIDEO_CAPABILITY_64BIT_BASE;
 836                 si->ext_lfb_base = ext_lfb_base;
 837         }
 838
 839         si->pages = 1;
 840
 841         setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format);
 842
 843         si->lfb_size = si->lfb_linelength * si->lfb_height;
 844
 845         si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
 846 out:
 847         return status;
 848 }
 849
 850 /*
 851  * See if we have Graphics Output Protocol
 852  */
 853 static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto,
 854                               unsigned long size)
 855 {
 856         efi_status_t status;
 857         void **gop_handle = NULL;
 858
 859         status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
 860                                 size, (void **)&gop_handle);
 861         if (status != EFI_SUCCESS)
 862                 return status;
 863
 864         status = efi_call_early(locate_handle,
 865                                 EFI_LOCATE_BY_PROTOCOL,
 866                                 proto, NULL, &size, gop_handle);
 867         if (status != EFI_SUCCESS)
 868                 goto free_handle;
 869
 870         if (efi_early->is64)
 871                 status = setup_gop64(si, proto, size, gop_handle);
 872         else
 873                 status = setup_gop32(si, proto, size, gop_handle);
 874
 875 free_handle:
 876         efi_call_early(free_pool, gop_handle);
 877         return status;
 878 }
 879
 880 static efi_status_t
 881 setup_uga32(void **uga_handle, unsigned long size, u32 *width, u32 *height)
 882 {
 883         struct efi_uga_draw_protocol *uga = NULL, *first_uga;
 884         efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
 885         unsigned long nr_ugas;
 886         u32 *handles = (u32 *)uga_handle;;
 887         efi_status_t status;
 888         int i;
 889
 890         first_uga = NULL;
 891         nr_ugas = size / sizeof(u32);
 892         for (i = 0; i < nr_ugas; i++) {
 893                 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
 894                 u32 w, h, depth, refresh;
 895                 void *pciio;
 896                 u32 handle = handles[i];
 897
 898                 status = efi_call_early(handle_protocol, handle,
 899                                         &uga_proto, (void **)&uga);
 900                 if (status != EFI_SUCCESS)
 901                         continue;
 902
 903                 efi_call_early(handle_protocol, handle, &pciio_proto, &pciio);
 904
 905                 status = efi_early->call((unsigned long)uga->get_mode, uga,
 906                                          &w, &h, &depth, &refresh);
 907                 if (status == EFI_SUCCESS && (!first_uga || pciio)) {
 908                         *width = w;
 909                         *height = h;
 910
 911                         /*
 912                          * Once we've found a UGA supporting PCIIO,
 913                          * don't bother looking any further.
 914                          */
 915                         if (pciio)
 916                                 break;
 917
 918                         first_uga = uga;
 919                 }
 920         }
 921
 922         return status;
 923 }
 924
 925 static efi_status_t
 926 setup_uga64(void **uga_handle, unsigned long size, u32 *width, u32 *height)
 927 {
 928         struct efi_uga_draw_protocol *uga = NULL, *first_uga;
 929         efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
 930         unsigned long nr_ugas;
 931         u64 *handles = (u64 *)uga_handle;;
 932         efi_status_t status;
 933         int i;
 934
 935         first_uga = NULL;
 936         nr_ugas = size / sizeof(u64);
 937         for (i = 0; i < nr_ugas; i++) {
 938                 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
 939                 u32 w, h, depth, refresh;
 940                 void *pciio;
 941                 u64 handle = handles[i];
 942
 943                 status = efi_call_early(handle_protocol, handle,
 944                                         &uga_proto, (void **)&uga);
 945                 if (status != EFI_SUCCESS)
 946                         continue;
 947
 948                 efi_call_early(handle_protocol, handle, &pciio_proto, &pciio);
 949
 950                 status = efi_early->call((unsigned long)uga->get_mode, uga,
 951                                          &w, &h, &depth, &refresh);
 952                 if (status == EFI_SUCCESS && (!first_uga || pciio)) {
 953                         *width = w;
 954                         *height = h;
 955
 956                         /*
 957                          * Once we've found a UGA supporting PCIIO,
 958                          * don't bother looking any further.
 959                          */
 960                         if (pciio)
 961                                 break;
 962
 963                         first_uga = uga;
 964                 }
 965         }
 966
 967         return status;
 968 }
 969
 970 /*
 971  * See if we have Universal Graphics Adapter (UGA) protocol
 972  */
 973 static efi_status_t setup_uga(struct screen_info *si, efi_guid_t *uga_proto,
 974                               unsigned long size)
 975 {
 976         efi_status_t status;
 977         u32 width, height;
 978         void **uga_handle = NULL;
 979
 980         status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
 981                                 size, (void **)&uga_handle);
 982         if (status != EFI_SUCCESS)
 983                 return status;
 984
 985         status = efi_call_early(locate_handle,
 986                                 EFI_LOCATE_BY_PROTOCOL,
 987                                 uga_proto, NULL, &size, uga_handle);
 988         if (status != EFI_SUCCESS)
 989                 goto free_handle;
 990
 991         height = 0;
 992         width = 0;
 993
 994         if (efi_early->is64)
 995                 status = setup_uga64(uga_handle, size, &width, &height);
 996         else
 997                 status = setup_uga32(uga_handle, size, &width, &height);
 998
 999         if (!width && !height)
1000                 goto free_handle;
1001
1002         /* EFI framebuffer */
1003         si->orig_video_isVGA = VIDEO_TYPE_EFI;
1004
1005         si->lfb_depth = 32;
1006         si->lfb_width = width;
1007         si->lfb_height = height;
1008
1009         si->red_size = 8;
1010         si->red_pos = 16;
1011         si->green_size = 8;
1012         si->green_pos = 8;
1013         si->blue_size = 8;
1014         si->blue_pos = 0;
1015         si->rsvd_size = 8;
1016         si->rsvd_pos = 24;
1017
1018 free_handle:
1019         efi_call_early(free_pool, uga_handle);
1020         return status;
1021 }
1022
1023 void setup_graphics(struct boot_params *boot_params)
1024 {
1025         efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
1026         struct screen_info *si;
1027         efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
1028         efi_status_t status;
1029         unsigned long size;
1030         void **gop_handle = NULL;
1031         void **uga_handle = NULL;
1032
1033         si = &boot_params->screen_info;
1034         memset(si, 0, sizeof(*si));
1035
1036         size = 0;
1037         status = efi_call_early(locate_handle,
1038                                 EFI_LOCATE_BY_PROTOCOL,
1039                                 &graphics_proto, NULL, &size, gop_handle);
1040         if (status == EFI_BUFFER_TOO_SMALL)
1041                 status = setup_gop(si, &graphics_proto, size);
1042
1043         if (status != EFI_SUCCESS) {
1044                 size = 0;
1045                 status = efi_call_early(locate_handle,
1046                                         EFI_LOCATE_BY_PROTOCOL,
1047                                         &uga_proto, NULL, &size, uga_handle);
1048                 if (status == EFI_BUFFER_TOO_SMALL)
1049                         setup_uga(si, &uga_proto, size);
1050         }
1051 }
1052
1053 /*
1054  * Because the x86 boot code expects to be passed a boot_params we
1055  * need to create one ourselves (usually the bootloader would create
1056  * one for us).
1057  *
1058  * The caller is responsible for filling out ->code32_start in the
1059  * returned boot_params.
1060  */
1061 struct boot_params *make_boot_params(struct efi_config *c)
1062 {
1063         struct boot_params *boot_params;
1064         struct apm_bios_info *bi;
1065         struct setup_header *hdr;
1066         struct efi_info *efi;
1067         efi_loaded_image_t *image;
1068         void *options, *handle;
1069         efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
1070         int options_size = 0;
1071         efi_status_t status;
1072         char *cmdline_ptr;
1073         u16 *s2;
1074         u8 *s1;
1075         int i;
1076         unsigned long ramdisk_addr;
1077         unsigned long ramdisk_size;
1078
1079         efi_early = c;
1080         sys_table = (efi_system_table_t *)(unsigned long)efi_early->table;
1081         handle = (void *)(unsigned long)efi_early->image_handle;
1082
1083         /* Check if we were booted by the EFI firmware */
1084         if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
1085                 return NULL;
1086
1087         if (efi_early->is64)
1088                 setup_boot_services64(efi_early);
1089         else
1090                 setup_boot_services32(efi_early);
1091
1092         status = efi_call_early(handle_protocol, handle,
1093                                 &proto, (void *)&image);
1094         if (status != EFI_SUCCESS) {
1095                 efi_printk(sys_table, "Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
1096                 return NULL;
1097         }
1098
1099         status = efi_low_alloc(sys_table, 0x4000, 1,
1100                                (unsigned long *)&boot_params);
1101         if (status != EFI_SUCCESS) {
1102                 efi_printk(sys_table, "Failed to alloc lowmem for boot params\n");
1103                 return NULL;
1104         }
1105
1106         memset(boot_params, 0x0, 0x4000);
1107
1108         hdr = &boot_params->hdr;
1109         efi = &boot_params->efi_info;
1110         bi = &boot_params->apm_bios_info;
1111
1112         /* Copy the second sector to boot_params */
1113         memcpy(&hdr->jump, image->image_base + 512, 512);
1114
1115         /*
1116          * Fill out some of the header fields ourselves because the
1117          * EFI firmware loader doesn't load the first sector.
1118          */
1119         hdr->root_flags = 1;
1120         hdr->vid_mode = 0xffff;
1121         hdr->boot_flag = 0xAA55;
1122
1123         hdr->type_of_loader = 0x21;
1124
1125         /* Convert unicode cmdline to ascii */
1126         cmdline_ptr = efi_convert_cmdline(sys_table, image, &options_size);
1127         if (!cmdline_ptr)
1128                 goto fail;
1129         hdr->cmd_line_ptr = (unsigned long)cmdline_ptr;
1130         /* Fill in upper bits of command line address, NOP on 32 bit  */
1131         boot_params->ext_cmd_line_ptr = (u64)(unsigned long)cmdline_ptr >> 32;
1132
1133         hdr->ramdisk_image = 0;
1134         hdr->ramdisk_size = 0;
1135
1136         /* Clear APM BIOS info */
1137         memset(bi, 0, sizeof(*bi));
1138
1139         status = efi_parse_options(cmdline_ptr);
1140         if (status != EFI_SUCCESS)
1141                 goto fail2;
1142
1143         status = handle_cmdline_files(sys_table, image,
1144                                       (char *)(unsigned long)hdr->cmd_line_ptr,
1145                                       "initrd=", hdr->initrd_addr_max,
1146                                       &ramdisk_addr, &ramdisk_size);
1147
1148         if (status != EFI_SUCCESS &&
1149             hdr->xloadflags & XLF_CAN_BE_LOADED_ABOVE_4G) {
1150                 efi_printk(sys_table, "Trying to load files to higher address\n");
1151                 status = handle_cmdline_files(sys_table, image,
1152                                       (char *)(unsigned long)hdr->cmd_line_ptr,
1153                                       "initrd=", -1UL,
1154                                       &ramdisk_addr, &ramdisk_size);
1155         }
1156
1157         if (status != EFI_SUCCESS)
1158                 goto fail2;
1159         hdr->ramdisk_image = ramdisk_addr & 0xffffffff;
1160         hdr->ramdisk_size  = ramdisk_size & 0xffffffff;
1161         boot_params->ext_ramdisk_image = (u64)ramdisk_addr >> 32;
1162         boot_params->ext_ramdisk_size  = (u64)ramdisk_size >> 32;
1163
1164         return boot_params;
1165 fail2:
1166         efi_free(sys_table, options_size, hdr->cmd_line_ptr);
1167 fail:
1168         efi_free(sys_table, 0x4000, (unsigned long)boot_params);
1169         return NULL;
1170 }
1171
1172 static void add_e820ext(struct boot_params *params,
1173                         struct setup_data *e820ext, u32 nr_entries)
1174 {
1175         struct setup_data *data;
1176         efi_status_t status;
1177         unsigned long size;
1178
1179         e820ext->type = SETUP_E820_EXT;
1180         e820ext->len = nr_entries * sizeof(struct e820entry);
1181         e820ext->next = 0;
1182
1183         data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
1184
1185         while (data && data->next)
1186                 data = (struct setup_data *)(unsigned long)data->next;
1187
1188         if (data)
1189                 data->next = (unsigned long)e820ext;
1190         else
1191                 params->hdr.setup_data = (unsigned long)e820ext;
1192 }
1193
1194 static efi_status_t setup_e820(struct boot_params *params,
1195                                struct setup_data *e820ext, u32 e820ext_size)
1196 {
1197         struct e820entry *e820_map = &params->e820_map[0];
1198         struct efi_info *efi = &params->efi_info;
1199         struct e820entry *prev = NULL;
1200         u32 nr_entries;
1201         u32 nr_desc;
1202         int i;
1203
1204         nr_entries = 0;
1205         nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size;
1206
1207         for (i = 0; i < nr_desc; i++) {
1208                 efi_memory_desc_t *d;
1209                 unsigned int e820_type = 0;
1210                 unsigned long m = efi->efi_memmap;
1211
1212 #ifdef CONFIG_X86_64
1213                 m |= (u64)efi->efi_memmap_hi << 32;
1214 #endif
1215
1216                 d = (efi_memory_desc_t *)(m + (i * efi->efi_memdesc_size));
1217                 switch (d->type) {
1218                 case EFI_RESERVED_TYPE:
1219                 case EFI_RUNTIME_SERVICES_CODE:
1220                 case EFI_RUNTIME_SERVICES_DATA:
1221                 case EFI_MEMORY_MAPPED_IO:
1222                 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1223                 case EFI_PAL_CODE:
1224                         e820_type = E820_RESERVED;
1225                         break;
1226
1227                 case EFI_UNUSABLE_MEMORY:
1228                         e820_type = E820_UNUSABLE;
1229                         break;
1230
1231                 case EFI_ACPI_RECLAIM_MEMORY:
1232                         e820_type = E820_ACPI;
1233                         break;
1234
1235                 case EFI_LOADER_CODE:
1236                 case EFI_LOADER_DATA:
1237                 case EFI_BOOT_SERVICES_CODE:
1238                 case EFI_BOOT_SERVICES_DATA:
1239                 case EFI_CONVENTIONAL_MEMORY:
1240                         e820_type = E820_RAM;
1241                         break;
1242
1243                 case EFI_ACPI_MEMORY_NVS:
1244                         e820_type = E820_NVS;
1245                         break;
1246
1247                 case EFI_PERSISTENT_MEMORY:
1248                         e820_type = E820_PMEM;
1249                         break;
1250
1251                 default:
1252                         continue;
1253                 }
1254
1255                 /* Merge adjacent mappings */
1256                 if (prev && prev->type == e820_type &&
1257                     (prev->addr + prev->size) == d->phys_addr) {
1258                         prev->size += d->num_pages << 12;
1259                         continue;
1260                 }
1261
1262                 if (nr_entries == ARRAY_SIZE(params->e820_map)) {
1263                         u32 need = (nr_desc - i) * sizeof(struct e820entry) +
1264                                    sizeof(struct setup_data);
1265
1266                         if (!e820ext || e820ext_size < need)
1267                                 return EFI_BUFFER_TOO_SMALL;
1268
1269                         /* boot_params map full, switch to e820 extended */
1270                         e820_map = (struct e820entry *)e820ext->data;
1271                 }
1272
1273                 e820_map->addr = d->phys_addr;
1274                 e820_map->size = d->num_pages << PAGE_SHIFT;
1275                 e820_map->type = e820_type;
1276                 prev = e820_map++;
1277                 nr_entries++;
1278         }
1279
1280         if (nr_entries > ARRAY_SIZE(params->e820_map)) {
1281                 u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_map);
1282
1283                 add_e820ext(params, e820ext, nr_e820ext);
1284                 nr_entries -= nr_e820ext;
1285         }
1286
1287         params->e820_entries = (u8)nr_entries;
1288
1289         return EFI_SUCCESS;
1290 }
1291
1292 static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext,
1293                                   u32 *e820ext_size)
1294 {
1295         efi_status_t status;
1296         unsigned long size;
1297
1298         size = sizeof(struct setup_data) +
1299                 sizeof(struct e820entry) * nr_desc;
1300
1301         if (*e820ext) {
1302                 efi_call_early(free_pool, *e820ext);
1303                 *e820ext = NULL;
1304                 *e820ext_size = 0;
1305         }
1306
1307         status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
1308                                 size, (void **)e820ext);
1309         if (status == EFI_SUCCESS)
1310                 *e820ext_size = size;
1311
1312         return status;
1313 }
1314
1315 static efi_status_t exit_boot(struct boot_params *boot_params,
1316                               void *handle, bool is64)
1317 {
1318         struct efi_info *efi = &boot_params->efi_info;
1319         unsigned long map_sz, key, desc_size;
1320         efi_memory_desc_t *mem_map;
1321         struct setup_data *e820ext;
1322         const char *signature;
1323         __u32 e820ext_size;
1324         __u32 nr_desc, prev_nr_desc;
1325         efi_status_t status;
1326         __u32 desc_version;
1327         bool called_exit = false;
1328         u8 nr_entries;
1329         int i;
1330
1331         nr_desc = 0;
1332         e820ext = NULL;
1333         e820ext_size = 0;
1334
1335 get_map:
1336         status = efi_get_memory_map(sys_table, &mem_map, &map_sz, &desc_size,
1337                                     &desc_version, &key);
1338
1339         if (status != EFI_SUCCESS)
1340                 return status;
1341
1342         prev_nr_desc = nr_desc;
1343         nr_desc = map_sz / desc_size;
1344         if (nr_desc > prev_nr_desc &&
1345             nr_desc > ARRAY_SIZE(boot_params->e820_map)) {
1346                 u32 nr_e820ext = nr_desc - ARRAY_SIZE(boot_params->e820_map);
1347
1348                 status = alloc_e820ext(nr_e820ext, &e820ext, &e820ext_size);
1349                 if (status != EFI_SUCCESS)
1350                         goto free_mem_map;
1351
1352                 efi_call_early(free_pool, mem_map);
1353                 goto get_map; /* Allocated memory, get map again */
1354         }
1355
1356         signature = is64 ? EFI64_LOADER_SIGNATURE : EFI32_LOADER_SIGNATURE;
1357         memcpy(&efi->efi_loader_signature, signature, sizeof(__u32));
1358
1359         efi->efi_systab = (unsigned long)sys_table;
1360         efi->efi_memdesc_size = desc_size;
1361         efi->efi_memdesc_version = desc_version;
1362         efi->efi_memmap = (unsigned long)mem_map;
1363         efi->efi_memmap_size = map_sz;
1364
1365 #ifdef CONFIG_X86_64
1366         efi->efi_systab_hi = (unsigned long)sys_table >> 32;
1367         efi->efi_memmap_hi = (unsigned long)mem_map >> 32;
1368 #endif
1369
1370         /* Might as well exit boot services now */
1371         status = efi_call_early(exit_boot_services, handle, key);
1372         if (status != EFI_SUCCESS) {
1373                 /*
1374                  * ExitBootServices() will fail if any of the event
1375                  * handlers change the memory map. In which case, we
1376                  * must be prepared to retry, but only once so that
1377                  * we're guaranteed to exit on repeated failures instead
1378                  * of spinning forever.
1379                  */
1380                 if (called_exit)
1381                         goto free_mem_map;
1382
1383                 called_exit = true;
1384                 efi_call_early(free_pool, mem_map);
1385                 goto get_map;
1386         }
1387
1388         /* Historic? */
1389         boot_params->alt_mem_k = 32 * 1024;
1390
1391         status = setup_e820(boot_params, e820ext, e820ext_size);
1392         if (status != EFI_SUCCESS)
1393                 return status;
1394
1395         return EFI_SUCCESS;
1396
1397 free_mem_map:
1398         efi_call_early(free_pool, mem_map);
1399         return status;
1400 }
1401
1402 /*
1403  * On success we return a pointer to a boot_params structure, and NULL
1404  * on failure.
1405  */
1406 struct boot_params *efi_main(struct efi_config *c,
1407                              struct boot_params *boot_params)
1408 {
1409         struct desc_ptr *gdt = NULL;
1410         efi_loaded_image_t *image;
1411         struct setup_header *hdr = &boot_params->hdr;
1412         efi_status_t status;
1413         struct desc_struct *desc;
1414         void *handle;
1415         efi_system_table_t *_table;
1416         bool is64;
1417
1418         efi_early = c;
1419
1420         _table = (efi_system_table_t *)(unsigned long)efi_early->table;
1421         handle = (void *)(unsigned long)efi_early->image_handle;
1422         is64 = efi_early->is64;
1423
1424         sys_table = _table;
1425
1426         /* Check if we were booted by the EFI firmware */
1427         if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
1428                 goto fail;
1429
1430         if (is64)
1431                 setup_boot_services64(efi_early);
1432         else
1433                 setup_boot_services32(efi_early);
1434
1435         setup_graphics(boot_params);
1436
1437         setup_efi_pci(boot_params);
1438
1439         status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
1440                                 sizeof(*gdt), (void **)&gdt);
1441         if (status != EFI_SUCCESS) {
1442                 efi_printk(sys_table, "Failed to alloc mem for gdt structure\n");
1443                 goto fail;
1444         }
1445
1446         gdt->size = 0x800;
1447         status = efi_low_alloc(sys_table, gdt->size, 8,
1448                            (unsigned long *)&gdt->address);
1449         if (status != EFI_SUCCESS) {
1450                 efi_printk(sys_table, "Failed to alloc mem for gdt\n");
1451                 goto fail;
1452         }
1453
1454         /*
1455          * If the kernel isn't already loaded at the preferred load
1456          * address, relocate it.
1457          */
1458         if (hdr->pref_address != hdr->code32_start) {
1459                 unsigned long bzimage_addr = hdr->code32_start;
1460                 status = efi_relocate_kernel(sys_table, &bzimage_addr,
1461                                              hdr->init_size, hdr->init_size,
1462                                              hdr->pref_address,
1463                                              hdr->kernel_alignment);
1464                 if (status != EFI_SUCCESS) {
1465                         efi_printk(sys_table, "efi_relocate_kernel() failed!\n");
1466                         goto fail;
1467                 }
1468
1469                 hdr->pref_address = hdr->code32_start;
1470                 hdr->code32_start = bzimage_addr;
1471         }
1472
1473         status = exit_boot(boot_params, handle, is64);
1474         if (status != EFI_SUCCESS) {
1475                 efi_printk(sys_table, "exit_boot() failed!\n");
1476                 goto fail;
1477         }
1478
1479         memset((char *)gdt->address, 0x0, gdt->size);
1480         desc = (struct desc_struct *)gdt->address;
1481
1482         /* The first GDT is a dummy and the second is unused. */
1483         desc += 2;
1484
1485         desc->limit0 = 0xffff;
1486         desc->base0 = 0x0000;
1487         desc->base1 = 0x0000;
1488         desc->type = SEG_TYPE_CODE | SEG_TYPE_EXEC_READ;
1489         desc->s = DESC_TYPE_CODE_DATA;
1490         desc->dpl = 0;
1491         desc->p = 1;
1492         desc->limit = 0xf;
1493         desc->avl = 0;
1494         desc->l = 0;
1495         desc->d = SEG_OP_SIZE_32BIT;
1496         desc->g = SEG_GRANULARITY_4KB;
1497         desc->base2 = 0x00;
1498
1499         desc++;
1500         desc->limit0 = 0xffff;
1501         desc->base0 = 0x0000;
1502         desc->base1 = 0x0000;
1503         desc->type = SEG_TYPE_DATA | SEG_TYPE_READ_WRITE;
1504         desc->s = DESC_TYPE_CODE_DATA;
1505         desc->dpl = 0;
1506         desc->p = 1;
1507         desc->limit = 0xf;
1508         desc->avl = 0;
1509         desc->l = 0;
1510         desc->d = SEG_OP_SIZE_32BIT;
1511         desc->g = SEG_GRANULARITY_4KB;
1512         desc->base2 = 0x00;
1513
1514 #ifdef CONFIG_X86_64
1515         /* Task segment value */
1516         desc++;
1517         desc->limit0 = 0x0000;
1518         desc->base0 = 0x0000;
1519         desc->base1 = 0x0000;
1520         desc->type = SEG_TYPE_TSS;
1521         desc->s = 0;
1522         desc->dpl = 0;
1523         desc->p = 1;
1524         desc->limit = 0x0;
1525         desc->avl = 0;
1526         desc->l = 0;
1527         desc->d = 0;
1528         desc->g = SEG_GRANULARITY_4KB;
1529         desc->base2 = 0x00;
1530 #endif /* CONFIG_X86_64 */
1531
1532         asm volatile("cli");
1533         asm volatile ("lgdt %0" : : "m" (*gdt));
1534
1535         return boot_params;
1536 fail:
1537         efi_printk(sys_table, "efi_main() failed!\n");
1538         return NULL;
1539 }