Pileus Git - ~andy/linux/blob - 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 <asm/efi.h>
  12 #include <asm/setup.h>
  13 #include <asm/desc.h>
  14
  15 #include "eboot.h"
  16
  17 static efi_system_table_t *sys_table;
  18
  19 static void efi_printk(char *str)
  20 {
  21         char *s8;
  22
  23         for (s8 = str; *s8; s8++) {
  24                 struct efi_simple_text_output_protocol *out;
  25                 efi_char16_t ch[2] = { 0 };
  26
  27                 ch[0] = *s8;
  28                 out = (struct efi_simple_text_output_protocol *)sys_table->con_out;
  29
  30                 if (*s8 == '\n') {
  31                         efi_char16_t nl[2] = { '\r', 0 };
  32                         efi_call_phys2(out->output_string, out, nl);
  33                 }
  34
  35                 efi_call_phys2(out->output_string, out, ch);
  36         }
  37 }
  38
  39 static efi_status_t __get_map(efi_memory_desc_t **map, unsigned long *map_size,
  40                               unsigned long *desc_size)
  41 {
  42         efi_memory_desc_t *m = NULL;
  43         efi_status_t status;
  44         unsigned long key;
  45         u32 desc_version;
  46
  47         *map_size = sizeof(*m) * 32;
  48 again:
  49         /*
  50          * Add an additional efi_memory_desc_t because we're doing an
  51          * allocation which may be in a new descriptor region.
  52          */
  53         *map_size += sizeof(*m);
  54         status = efi_call_phys3(sys_table->boottime->allocate_pool,
  55                                 EFI_LOADER_DATA, *map_size, (void **)&m);
  56         if (status != EFI_SUCCESS)
  57                 goto fail;
  58
  59         status = efi_call_phys5(sys_table->boottime->get_memory_map, map_size,
  60                                 m, &key, desc_size, &desc_version);
  61         if (status == EFI_BUFFER_TOO_SMALL) {
  62                 efi_call_phys1(sys_table->boottime->free_pool, m);
  63                 goto again;
  64         }
  65
  66         if (status != EFI_SUCCESS)
  67                 efi_call_phys1(sys_table->boottime->free_pool, m);
  68
  69 fail:
  70         *map = m;
  71         return status;
  72 }
  73
  74 /*
  75  * Allocate at the highest possible address that is not above 'max'.
  76  */
  77 static efi_status_t high_alloc(unsigned long size, unsigned long align,
  78                               unsigned long *addr, unsigned long max)
  79 {
  80         unsigned long map_size, desc_size;
  81         efi_memory_desc_t *map;
  82         efi_status_t status;
  83         unsigned long nr_pages;
  84         u64 max_addr = 0;
  85         int i;
  86
  87         status = __get_map(&map, &map_size, &desc_size);
  88         if (status != EFI_SUCCESS)
  89                 goto fail;
  90
  91         nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
  92 again:
  93         for (i = 0; i < map_size / desc_size; i++) {
  94                 efi_memory_desc_t *desc;
  95                 unsigned long m = (unsigned long)map;
  96                 u64 start, end;
  97
  98                 desc = (efi_memory_desc_t *)(m + (i * desc_size));
  99                 if (desc->type != EFI_CONVENTIONAL_MEMORY)
 100                         continue;
 101
 102                 if (desc->num_pages < nr_pages)
 103                         continue;
 104
 105                 start = desc->phys_addr;
 106                 end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT);
 107
 108                 if ((start + size) > end || (start + size) > max)
 109                         continue;
 110
 111                 if (end - size > max)
 112                         end = max;
 113
 114                 if (round_down(end - size, align) < start)
 115                         continue;
 116
 117                 start = round_down(end - size, align);
 118
 119                 /*
 120                  * Don't allocate at 0x0. It will confuse code that
 121                  * checks pointers against NULL.
 122                  */
 123                 if (start == 0x0)
 124                         continue;
 125
 126                 if (start > max_addr)
 127                         max_addr = start;
 128         }
 129
 130         if (!max_addr)
 131                 status = EFI_NOT_FOUND;
 132         else {
 133                 status = efi_call_phys4(sys_table->boottime->allocate_pages,
 134                                         EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
 135                                         nr_pages, &max_addr);
 136                 if (status != EFI_SUCCESS) {
 137                         max = max_addr;
 138                         max_addr = 0;
 139                         goto again;
 140                 }
 141
 142                 *addr = max_addr;
 143         }
 144
 145 free_pool:
 146         efi_call_phys1(sys_table->boottime->free_pool, map);
 147
 148 fail:
 149         return status;
 150 }
 151
 152 /*
 153  * Allocate at the lowest possible address.
 154  */
 155 static efi_status_t low_alloc(unsigned long size, unsigned long align,
 156                               unsigned long *addr)
 157 {
 158         unsigned long map_size, desc_size;
 159         efi_memory_desc_t *map;
 160         efi_status_t status;
 161         unsigned long nr_pages;
 162         int i;
 163
 164         status = __get_map(&map, &map_size, &desc_size);
 165         if (status != EFI_SUCCESS)
 166                 goto fail;
 167
 168         nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
 169         for (i = 0; i < map_size / desc_size; i++) {
 170                 efi_memory_desc_t *desc;
 171                 unsigned long m = (unsigned long)map;
 172                 u64 start, end;
 173
 174                 desc = (efi_memory_desc_t *)(m + (i * desc_size));
 175
 176                 if (desc->type != EFI_CONVENTIONAL_MEMORY)
 177                         continue;
 178
 179                 if (desc->num_pages < nr_pages)
 180                         continue;
 181
 182                 start = desc->phys_addr;
 183                 end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT);
 184
 185                 /*
 186                  * Don't allocate at 0x0. It will confuse code that
 187                  * checks pointers against NULL. Skip the first 8
 188                  * bytes so we start at a nice even number.
 189                  */
 190                 if (start == 0x0)
 191                         start += 8;
 192
 193                 start = round_up(start, align);
 194                 if ((start + size) > end)
 195                         continue;
 196
 197                 status = efi_call_phys4(sys_table->boottime->allocate_pages,
 198                                         EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
 199                                         nr_pages, &start);
 200                 if (status == EFI_SUCCESS) {
 201                         *addr = start;
 202                         break;
 203                 }
 204         }
 205
 206         if (i == map_size / desc_size)
 207                 status = EFI_NOT_FOUND;
 208
 209 free_pool:
 210         efi_call_phys1(sys_table->boottime->free_pool, map);
 211 fail:
 212         return status;
 213 }
 214
 215 static void low_free(unsigned long size, unsigned long addr)
 216 {
 217         unsigned long nr_pages;
 218
 219         nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
 220         efi_call_phys2(sys_table->boottime->free_pages, addr, size);
 221 }
 222
 223 static void find_bits(unsigned long mask, u8 *pos, u8 *size)
 224 {
 225         u8 first, len;
 226
 227         first = 0;
 228         len = 0;
 229
 230         if (mask) {
 231                 while (!(mask & 0x1)) {
 232                         mask = mask >> 1;
 233                         first++;
 234                 }
 235
 236                 while (mask & 0x1) {
 237                         mask = mask >> 1;
 238                         len++;
 239                 }
 240         }
 241
 242         *pos = first;
 243         *size = len;
 244 }
 245
 246 /*
 247  * See if we have Graphics Output Protocol
 248  */
 249 static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto,
 250                               unsigned long size)
 251 {
 252         struct efi_graphics_output_protocol *gop, *first_gop;
 253         struct efi_pixel_bitmask pixel_info;
 254         unsigned long nr_gops;
 255         efi_status_t status;
 256         void **gop_handle;
 257         u16 width, height;
 258         u32 fb_base, fb_size;
 259         u32 pixels_per_scan_line;
 260         int pixel_format;
 261         int i;
 262
 263         status = efi_call_phys3(sys_table->boottime->allocate_pool,
 264                                 EFI_LOADER_DATA, size, &gop_handle);
 265         if (status != EFI_SUCCESS)
 266                 return status;
 267
 268         status = efi_call_phys5(sys_table->boottime->locate_handle,
 269                                 EFI_LOCATE_BY_PROTOCOL, proto,
 270                                 NULL, &size, gop_handle);
 271         if (status != EFI_SUCCESS)
 272                 goto free_handle;
 273
 274         first_gop = NULL;
 275
 276         nr_gops = size / sizeof(void *);
 277         for (i = 0; i < nr_gops; i++) {
 278                 struct efi_graphics_output_mode_info *info;
 279                 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
 280                 void *pciio;
 281                 void *h = gop_handle[i];
 282
 283                 status = efi_call_phys3(sys_table->boottime->handle_protocol,
 284                                         h, proto, &gop);
 285                 if (status != EFI_SUCCESS)
 286                         continue;
 287
 288                 efi_call_phys3(sys_table->boottime->handle_protocol,
 289                                h, &pciio_proto, &pciio);
 290
 291                 status = efi_call_phys4(gop->query_mode, gop,
 292                                         gop->mode->mode, &size, &info);
 293                 if (status == EFI_SUCCESS && (!first_gop || pciio)) {
 294                         /*
 295                          * Apple provide GOPs that are not backed by
 296                          * real hardware (they're used to handle
 297                          * multiple displays). The workaround is to
 298                          * search for a GOP implementing the PCIIO
 299                          * protocol, and if one isn't found, to just
 300                          * fallback to the first GOP.
 301                          */
 302                         width = info->horizontal_resolution;
 303                         height = info->vertical_resolution;
 304                         fb_base = gop->mode->frame_buffer_base;
 305                         fb_size = gop->mode->frame_buffer_size;
 306                         pixel_format = info->pixel_format;
 307                         pixel_info = info->pixel_information;
 308                         pixels_per_scan_line = info->pixels_per_scan_line;
 309
 310                         /*
 311                          * Once we've found a GOP supporting PCIIO,
 312                          * don't bother looking any further.
 313                          */
 314                         if (pciio)
 315                                 break;
 316
 317                         first_gop = gop;
 318                 }
 319         }
 320
 321         /* Did we find any GOPs? */
 322         if (!first_gop)
 323                 goto free_handle;
 324
 325         /* EFI framebuffer */
 326         si->orig_video_isVGA = VIDEO_TYPE_EFI;
 327
 328         si->lfb_width = width;
 329         si->lfb_height = height;
 330         si->lfb_base = fb_base;
 331         si->lfb_size = fb_size;
 332         si->pages = 1;
 333
 334         if (pixel_format == PIXEL_RGB_RESERVED_8BIT_PER_COLOR) {
 335                 si->lfb_depth = 32;
 336                 si->lfb_linelength = pixels_per_scan_line * 4;
 337                 si->red_size = 8;
 338                 si->red_pos = 0;
 339                 si->green_size = 8;
 340                 si->green_pos = 8;
 341                 si->blue_size = 8;
 342                 si->blue_pos = 16;
 343                 si->rsvd_size = 8;
 344                 si->rsvd_pos = 24;
 345         } else if (pixel_format == PIXEL_BGR_RESERVED_8BIT_PER_COLOR) {
 346                 si->lfb_depth = 32;
 347                 si->lfb_linelength = pixels_per_scan_line * 4;
 348                 si->red_size = 8;
 349                 si->red_pos = 16;
 350                 si->green_size = 8;
 351                 si->green_pos = 8;
 352                 si->blue_size = 8;
 353                 si->blue_pos = 0;
 354                 si->rsvd_size = 8;
 355                 si->rsvd_pos = 24;
 356         } else if (pixel_format == PIXEL_BIT_MASK) {
 357                 find_bits(pixel_info.red_mask, &si->red_pos, &si->red_size);
 358                 find_bits(pixel_info.green_mask, &si->green_pos,
 359                           &si->green_size);
 360                 find_bits(pixel_info.blue_mask, &si->blue_pos, &si->blue_size);
 361                 find_bits(pixel_info.reserved_mask, &si->rsvd_pos,
 362                           &si->rsvd_size);
 363                 si->lfb_depth = si->red_size + si->green_size +
 364                         si->blue_size + si->rsvd_size;
 365                 si->lfb_linelength = (pixels_per_scan_line * si->lfb_depth) / 8;
 366         } else {
 367                 si->lfb_depth = 4;
 368                 si->lfb_linelength = si->lfb_width / 2;
 369                 si->red_size = 0;
 370                 si->red_pos = 0;
 371                 si->green_size = 0;
 372                 si->green_pos = 0;
 373                 si->blue_size = 0;
 374                 si->blue_pos = 0;
 375                 si->rsvd_size = 0;
 376                 si->rsvd_pos = 0;
 377         }
 378
 379 free_handle:
 380         efi_call_phys1(sys_table->boottime->free_pool, gop_handle);
 381         return status;
 382 }
 383
 384 /*
 385  * See if we have Universal Graphics Adapter (UGA) protocol
 386  */
 387 static efi_status_t setup_uga(struct screen_info *si, efi_guid_t *uga_proto,
 388                               unsigned long size)
 389 {
 390         struct efi_uga_draw_protocol *uga, *first_uga;
 391         unsigned long nr_ugas;
 392         efi_status_t status;
 393         u32 width, height;
 394         void **uga_handle = NULL;
 395         int i;
 396
 397         status = efi_call_phys3(sys_table->boottime->allocate_pool,
 398                                 EFI_LOADER_DATA, size, &uga_handle);
 399         if (status != EFI_SUCCESS)
 400                 return status;
 401
 402         status = efi_call_phys5(sys_table->boottime->locate_handle,
 403                                 EFI_LOCATE_BY_PROTOCOL, uga_proto,
 404                                 NULL, &size, uga_handle);
 405         if (status != EFI_SUCCESS)
 406                 goto free_handle;
 407
 408         first_uga = NULL;
 409
 410         nr_ugas = size / sizeof(void *);
 411         for (i = 0; i < nr_ugas; i++) {
 412                 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
 413                 void *handle = uga_handle[i];
 414                 u32 w, h, depth, refresh;
 415                 void *pciio;
 416
 417                 status = efi_call_phys3(sys_table->boottime->handle_protocol,
 418                                         handle, uga_proto, &uga);
 419                 if (status != EFI_SUCCESS)
 420                         continue;
 421
 422                 efi_call_phys3(sys_table->boottime->handle_protocol,
 423                                handle, &pciio_proto, &pciio);
 424
 425                 status = efi_call_phys5(uga->get_mode, uga, &w, &h,
 426                                         &depth, &refresh);
 427                 if (status == EFI_SUCCESS && (!first_uga || pciio)) {
 428                         width = w;
 429                         height = h;
 430
 431                         /*
 432                          * Once we've found a UGA supporting PCIIO,
 433                          * don't bother looking any further.
 434                          */
 435                         if (pciio)
 436                                 break;
 437
 438                         first_uga = uga;
 439                 }
 440         }
 441
 442         if (!first_uga)
 443                 goto free_handle;
 444
 445         /* EFI framebuffer */
 446         si->orig_video_isVGA = VIDEO_TYPE_EFI;
 447
 448         si->lfb_depth = 32;
 449         si->lfb_width = width;
 450         si->lfb_height = height;
 451
 452         si->red_size = 8;
 453         si->red_pos = 16;
 454         si->green_size = 8;
 455         si->green_pos = 8;
 456         si->blue_size = 8;
 457         si->blue_pos = 0;
 458         si->rsvd_size = 8;
 459         si->rsvd_pos = 24;
 460
 461
 462 free_handle:
 463         efi_call_phys1(sys_table->boottime->free_pool, uga_handle);
 464         return status;
 465 }
 466
 467 void setup_graphics(struct boot_params *boot_params)
 468 {
 469         efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
 470         struct screen_info *si;
 471         efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
 472         efi_status_t status;
 473         unsigned long size;
 474         void **gop_handle = NULL;
 475         void **uga_handle = NULL;
 476
 477         si = &boot_params->screen_info;
 478         memset(si, 0, sizeof(*si));
 479
 480         size = 0;
 481         status = efi_call_phys5(sys_table->boottime->locate_handle,
 482                                 EFI_LOCATE_BY_PROTOCOL, &graphics_proto,
 483                                 NULL, &size, gop_handle);
 484         if (status == EFI_BUFFER_TOO_SMALL)
 485                 status = setup_gop(si, &graphics_proto, size);
 486
 487         if (status != EFI_SUCCESS) {
 488                 size = 0;
 489                 status = efi_call_phys5(sys_table->boottime->locate_handle,
 490                                         EFI_LOCATE_BY_PROTOCOL, &uga_proto,
 491                                         NULL, &size, uga_handle);
 492                 if (status == EFI_BUFFER_TOO_SMALL)
 493                         setup_uga(si, &uga_proto, size);
 494         }
 495 }
 496
 497 struct initrd {
 498         efi_file_handle_t *handle;
 499         u64 size;
 500 };
 501
 502 /*
 503  * Check the cmdline for a LILO-style initrd= arguments.
 504  *
 505  * We only support loading an initrd from the same filesystem as the
 506  * kernel image.
 507  */
 508 static efi_status_t handle_ramdisks(efi_loaded_image_t *image,
 509                                     struct setup_header *hdr)
 510 {
 511         struct initrd *initrds;
 512         unsigned long initrd_addr;
 513         efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
 514         u64 initrd_total;
 515         efi_file_io_interface_t *io;
 516         efi_file_handle_t *fh;
 517         efi_status_t status;
 518         int nr_initrds;
 519         char *str;
 520         int i, j, k;
 521
 522         initrd_addr = 0;
 523         initrd_total = 0;
 524
 525         str = (char *)(unsigned long)hdr->cmd_line_ptr;
 526
 527         j = 0;                  /* See close_handles */
 528
 529         if (!str || !*str)
 530                 return EFI_SUCCESS;
 531
 532         for (nr_initrds = 0; *str; nr_initrds++) {
 533                 str = strstr(str, "initrd=");
 534                 if (!str)
 535                         break;
 536
 537                 str += 7;
 538
 539                 /* Skip any leading slashes */
 540                 while (*str == '/' || *str == '\\')
 541                         str++;
 542
 543                 while (*str && *str != ' ' && *str != '\n')
 544                         str++;
 545         }
 546
 547         if (!nr_initrds)
 548                 return EFI_SUCCESS;
 549
 550         status = efi_call_phys3(sys_table->boottime->allocate_pool,
 551                                 EFI_LOADER_DATA,
 552                                 nr_initrds * sizeof(*initrds),
 553                                 &initrds);
 554         if (status != EFI_SUCCESS) {
 555                 efi_printk("Failed to alloc mem for initrds\n");
 556                 goto fail;
 557         }
 558
 559         str = (char *)(unsigned long)hdr->cmd_line_ptr;
 560         for (i = 0; i < nr_initrds; i++) {
 561                 struct initrd *initrd;
 562                 efi_file_handle_t *h;
 563                 efi_file_info_t *info;
 564                 efi_char16_t filename_16[256];
 565                 unsigned long info_sz;
 566                 efi_guid_t info_guid = EFI_FILE_INFO_ID;
 567                 efi_char16_t *p;
 568                 u64 file_sz;
 569
 570                 str = strstr(str, "initrd=");
 571                 if (!str)
 572                         break;
 573
 574                 str += 7;
 575
 576                 initrd = &initrds[i];
 577                 p = filename_16;
 578
 579                 /* Skip any leading slashes */
 580                 while (*str == '/' || *str == '\\')
 581                         str++;
 582
 583                 while (*str && *str != ' ' && *str != '\n') {
 584                         if ((u8 *)p >= (u8 *)filename_16 + sizeof(filename_16))
 585                                 break;
 586
 587                         *p++ = *str++;
 588                 }
 589
 590                 *p = '\0';
 591
 592                 /* Only open the volume once. */
 593                 if (!i) {
 594                         efi_boot_services_t *boottime;
 595
 596                         boottime = sys_table->boottime;
 597
 598                         status = efi_call_phys3(boottime->handle_protocol,
 599                                         image->device_handle, &fs_proto, &io);
 600                         if (status != EFI_SUCCESS) {
 601                                 efi_printk("Failed to handle fs_proto\n");
 602                                 goto free_initrds;
 603                         }
 604
 605                         status = efi_call_phys2(io->open_volume, io, &fh);
 606                         if (status != EFI_SUCCESS) {
 607                                 efi_printk("Failed to open volume\n");
 608                                 goto free_initrds;
 609                         }
 610                 }
 611
 612                 status = efi_call_phys5(fh->open, fh, &h, filename_16,
 613                                         EFI_FILE_MODE_READ, (u64)0);
 614                 if (status != EFI_SUCCESS) {
 615                         efi_printk("Failed to open initrd file\n");
 616                         goto close_handles;
 617                 }
 618
 619                 initrd->handle = h;
 620
 621                 info_sz = 0;
 622                 status = efi_call_phys4(h->get_info, h, &info_guid,
 623                                         &info_sz, NULL);
 624                 if (status != EFI_BUFFER_TOO_SMALL) {
 625                         efi_printk("Failed to get initrd info size\n");
 626                         goto close_handles;
 627                 }
 628
 629 grow:
 630                 status = efi_call_phys3(sys_table->boottime->allocate_pool,
 631                                         EFI_LOADER_DATA, info_sz, &info);
 632                 if (status != EFI_SUCCESS) {
 633                         efi_printk("Failed to alloc mem for initrd info\n");
 634                         goto close_handles;
 635                 }
 636
 637                 status = efi_call_phys4(h->get_info, h, &info_guid,
 638                                         &info_sz, info);
 639                 if (status == EFI_BUFFER_TOO_SMALL) {
 640                         efi_call_phys1(sys_table->boottime->free_pool, info);
 641                         goto grow;
 642                 }
 643
 644                 file_sz = info->file_size;
 645                 efi_call_phys1(sys_table->boottime->free_pool, info);
 646
 647                 if (status != EFI_SUCCESS) {
 648                         efi_printk("Failed to get initrd info\n");
 649                         goto close_handles;
 650                 }
 651
 652                 initrd->size = file_sz;
 653                 initrd_total += file_sz;
 654         }
 655
 656         if (initrd_total) {
 657                 unsigned long addr;
 658
 659                 /*
 660                  * Multiple initrd's need to be at consecutive
 661                  * addresses in memory, so allocate enough memory for
 662                  * all the initrd's.
 663                  */
 664                 status = high_alloc(initrd_total, 0x1000,
 665                                    &initrd_addr, hdr->initrd_addr_max);
 666                 if (status != EFI_SUCCESS) {
 667                         efi_printk("Failed to alloc highmem for initrds\n");
 668                         goto close_handles;
 669                 }
 670
 671                 /* We've run out of free low memory. */
 672                 if (initrd_addr > hdr->initrd_addr_max) {
 673                         efi_printk("We've run out of free low memory\n");
 674                         status = EFI_INVALID_PARAMETER;
 675                         goto free_initrd_total;
 676                 }
 677
 678                 addr = initrd_addr;
 679                 for (j = 0; j < nr_initrds; j++) {
 680                         u64 size;
 681
 682                         size = initrds[j].size;
 683                         while (size) {
 684                                 u64 chunksize;
 685                                 if (size > EFI_READ_CHUNK_SIZE)
 686                                         chunksize = EFI_READ_CHUNK_SIZE;
 687                                 else
 688                                         chunksize = size;
 689                                 status = efi_call_phys3(fh->read,
 690                                                         initrds[j].handle,
 691                                                         &chunksize, addr);
 692                                 if (status != EFI_SUCCESS) {
 693                                         efi_printk("Failed to read initrd\n");
 694                                         goto free_initrd_total;
 695                                 }
 696                                 addr += chunksize;
 697                                 size -= chunksize;
 698                         }
 699
 700                         efi_call_phys1(fh->close, initrds[j].handle);
 701                 }
 702
 703         }
 704
 705         efi_call_phys1(sys_table->boottime->free_pool, initrds);
 706
 707         hdr->ramdisk_image = initrd_addr;
 708         hdr->ramdisk_size = initrd_total;
 709
 710         return status;
 711
 712 free_initrd_total:
 713         low_free(initrd_total, initrd_addr);
 714
 715 close_handles:
 716         for (k = j; k < i; k++)
 717                 efi_call_phys1(fh->close, initrds[k].handle);
 718 free_initrds:
 719         efi_call_phys1(sys_table->boottime->free_pool, initrds);
 720 fail:
 721         hdr->ramdisk_image = 0;
 722         hdr->ramdisk_size = 0;
 723
 724         return status;
 725 }
 726
 727 /*
 728  * Because the x86 boot code expects to be passed a boot_params we
 729  * need to create one ourselves (usually the bootloader would create
 730  * one for us).
 731  */
 732 struct boot_params *make_boot_params(void *handle, efi_system_table_t *_table)
 733 {
 734         struct boot_params *boot_params;
 735         struct sys_desc_table *sdt;
 736         struct apm_bios_info *bi;
 737         struct setup_header *hdr;
 738         struct efi_info *efi;
 739         efi_loaded_image_t *image;
 740         void *options;
 741         u32 load_options_size;
 742         efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
 743         int options_size = 0;
 744         efi_status_t status;
 745         unsigned long cmdline;
 746         u16 *s2;
 747         u8 *s1;
 748         int i;
 749
 750         sys_table = _table;
 751
 752         /* Check if we were booted by the EFI firmware */
 753         if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 754                 return NULL;
 755
 756         status = efi_call_phys3(sys_table->boottime->handle_protocol,
 757                                 handle, &proto, (void *)&image);
 758         if (status != EFI_SUCCESS) {
 759                 efi_printk("Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
 760                 return NULL;
 761         }
 762
 763         status = low_alloc(0x4000, 1, (unsigned long *)&boot_params);
 764         if (status != EFI_SUCCESS) {
 765                 efi_printk("Failed to alloc lowmem for boot params\n");
 766                 return NULL;
 767         }
 768
 769         memset(boot_params, 0x0, 0x4000);
 770
 771         hdr = &boot_params->hdr;
 772         efi = &boot_params->efi_info;
 773         bi = &boot_params->apm_bios_info;
 774         sdt = &boot_params->sys_desc_table;
 775
 776         /* Copy the second sector to boot_params */
 777         memcpy(&hdr->jump, image->image_base + 512, 512);
 778
 779         /*
 780          * Fill out some of the header fields ourselves because the
 781          * EFI firmware loader doesn't load the first sector.
 782          */
 783         hdr->root_flags = 1;
 784         hdr->vid_mode = 0xffff;
 785         hdr->boot_flag = 0xAA55;
 786
 787         hdr->code32_start = (__u64)(unsigned long)image->image_base;
 788
 789         hdr->type_of_loader = 0x21;
 790
 791         /* Convert unicode cmdline to ascii */
 792         options = image->load_options;
 793         load_options_size = image->load_options_size / 2; /* ASCII */
 794         cmdline = 0;
 795         s2 = (u16 *)options;
 796
 797         if (s2) {
 798                 while (*s2 && *s2 != '\n' && options_size < load_options_size) {
 799                         s2++;
 800                         options_size++;
 801                 }
 802
 803                 if (options_size) {
 804                         if (options_size > hdr->cmdline_size)
 805                                 options_size = hdr->cmdline_size;
 806
 807                         options_size++; /* NUL termination */
 808
 809                         status = low_alloc(options_size, 1, &cmdline);
 810                         if (status != EFI_SUCCESS) {
 811                                 efi_printk("Failed to alloc mem for cmdline\n");
 812                                 goto fail;
 813                         }
 814
 815                         s1 = (u8 *)(unsigned long)cmdline;
 816                         s2 = (u16 *)options;
 817
 818                         for (i = 0; i < options_size - 1; i++)
 819                                 *s1++ = *s2++;
 820
 821                         *s1 = '\0';
 822                 }
 823         }
 824
 825         hdr->cmd_line_ptr = cmdline;
 826
 827         hdr->ramdisk_image = 0;
 828         hdr->ramdisk_size = 0;
 829
 830         /* Clear APM BIOS info */
 831         memset(bi, 0, sizeof(*bi));
 832
 833         memset(sdt, 0, sizeof(*sdt));
 834
 835         status = handle_ramdisks(image, hdr);
 836         if (status != EFI_SUCCESS)
 837                 goto fail2;
 838
 839         return boot_params;
 840 fail2:
 841         if (options_size)
 842                 low_free(options_size, hdr->cmd_line_ptr);
 843 fail:
 844         low_free(0x4000, (unsigned long)boot_params);
 845         return NULL;
 846 }
 847
 848 static efi_status_t exit_boot(struct boot_params *boot_params,
 849                               void *handle)
 850 {
 851         struct efi_info *efi = &boot_params->efi_info;
 852         struct e820entry *e820_map = &boot_params->e820_map[0];
 853         struct e820entry *prev = NULL;
 854         unsigned long size, key, desc_size, _size;
 855         efi_memory_desc_t *mem_map;
 856         efi_status_t status;
 857         __u32 desc_version;
 858         u8 nr_entries;
 859         int i;
 860
 861         size = sizeof(*mem_map) * 32;
 862
 863 again:
 864         size += sizeof(*mem_map);
 865         _size = size;
 866         status = low_alloc(size, 1, (unsigned long *)&mem_map);
 867         if (status != EFI_SUCCESS)
 868                 return status;
 869
 870         status = efi_call_phys5(sys_table->boottime->get_memory_map, &size,
 871                                 mem_map, &key, &desc_size, &desc_version);
 872         if (status == EFI_BUFFER_TOO_SMALL) {
 873                 low_free(_size, (unsigned long)mem_map);
 874                 goto again;
 875         }
 876
 877         if (status != EFI_SUCCESS)
 878                 goto free_mem_map;
 879
 880         memcpy(&efi->efi_loader_signature, EFI_LOADER_SIGNATURE, sizeof(__u32));
 881         efi->efi_systab = (unsigned long)sys_table;
 882         efi->efi_memdesc_size = desc_size;
 883         efi->efi_memdesc_version = desc_version;
 884         efi->efi_memmap = (unsigned long)mem_map;
 885         efi->efi_memmap_size = size;
 886
 887 #ifdef CONFIG_X86_64
 888         efi->efi_systab_hi = (unsigned long)sys_table >> 32;
 889         efi->efi_memmap_hi = (unsigned long)mem_map >> 32;
 890 #endif
 891
 892         /* Might as well exit boot services now */
 893         status = efi_call_phys2(sys_table->boottime->exit_boot_services,
 894                                 handle, key);
 895         if (status != EFI_SUCCESS)
 896                 goto free_mem_map;
 897
 898         /* Historic? */
 899         boot_params->alt_mem_k = 32 * 1024;
 900
 901         /*
 902          * Convert the EFI memory map to E820.
 903          */
 904         nr_entries = 0;
 905         for (i = 0; i < size / desc_size; i++) {
 906                 efi_memory_desc_t *d;
 907                 unsigned int e820_type = 0;
 908                 unsigned long m = (unsigned long)mem_map;
 909
 910                 d = (efi_memory_desc_t *)(m + (i * desc_size));
 911                 switch (d->type) {
 912                 case EFI_RESERVED_TYPE:
 913                 case EFI_RUNTIME_SERVICES_CODE:
 914                 case EFI_RUNTIME_SERVICES_DATA:
 915                 case EFI_MEMORY_MAPPED_IO:
 916                 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
 917                 case EFI_PAL_CODE:
 918                         e820_type = E820_RESERVED;
 919                         break;
 920
 921                 case EFI_UNUSABLE_MEMORY:
 922                         e820_type = E820_UNUSABLE;
 923                         break;
 924
 925                 case EFI_ACPI_RECLAIM_MEMORY:
 926                         e820_type = E820_ACPI;
 927                         break;
 928
 929                 case EFI_LOADER_CODE:
 930                 case EFI_LOADER_DATA:
 931                 case EFI_BOOT_SERVICES_CODE:
 932                 case EFI_BOOT_SERVICES_DATA:
 933                 case EFI_CONVENTIONAL_MEMORY:
 934                         e820_type = E820_RAM;
 935                         break;
 936
 937                 case EFI_ACPI_MEMORY_NVS:
 938                         e820_type = E820_NVS;
 939                         break;
 940
 941                 default:
 942                         continue;
 943                 }
 944
 945                 /* Merge adjacent mappings */
 946                 if (prev && prev->type == e820_type &&
 947                     (prev->addr + prev->size) == d->phys_addr)
 948                         prev->size += d->num_pages << 12;
 949                 else {
 950                         e820_map->addr = d->phys_addr;
 951                         e820_map->size = d->num_pages << 12;
 952                         e820_map->type = e820_type;
 953                         prev = e820_map++;
 954                         nr_entries++;
 955                 }
 956         }
 957
 958         boot_params->e820_entries = nr_entries;
 959
 960         return EFI_SUCCESS;
 961
 962 free_mem_map:
 963         low_free(_size, (unsigned long)mem_map);
 964         return status;
 965 }
 966
 967 static efi_status_t relocate_kernel(struct setup_header *hdr)
 968 {
 969         unsigned long start, nr_pages;
 970         efi_status_t status;
 971
 972         /*
 973          * The EFI firmware loader could have placed the kernel image
 974          * anywhere in memory, but the kernel has various restrictions
 975          * on the max physical address it can run at. Attempt to move
 976          * the kernel to boot_params.pref_address, or as low as
 977          * possible.
 978          */
 979         start = hdr->pref_address;
 980         nr_pages = round_up(hdr->init_size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
 981
 982         status = efi_call_phys4(sys_table->boottime->allocate_pages,
 983                                 EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
 984                                 nr_pages, &start);
 985         if (status != EFI_SUCCESS) {
 986                 status = low_alloc(hdr->init_size, hdr->kernel_alignment,
 987                                    &start);
 988                 if (status != EFI_SUCCESS)
 989                         efi_printk("Failed to alloc mem for kernel\n");
 990         }
 991
 992         if (status == EFI_SUCCESS)
 993                 memcpy((void *)start, (void *)(unsigned long)hdr->code32_start,
 994                        hdr->init_size);
 995
 996         hdr->pref_address = hdr->code32_start;
 997         hdr->code32_start = (__u32)start;
 998
 999         return status;
1000 }
1001
1002 /*
1003  * On success we return a pointer to a boot_params structure, and NULL
1004  * on failure.
1005  */
1006 struct boot_params *efi_main(void *handle, efi_system_table_t *_table,
1007                              struct boot_params *boot_params)
1008 {
1009         struct desc_ptr *gdt, *idt;
1010         efi_loaded_image_t *image;
1011         struct setup_header *hdr = &boot_params->hdr;
1012         efi_status_t status;
1013         struct desc_struct *desc;
1014
1015         sys_table = _table;
1016
1017         /* Check if we were booted by the EFI firmware */
1018         if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
1019                 goto fail;
1020
1021         setup_graphics(boot_params);
1022
1023         status = efi_call_phys3(sys_table->boottime->allocate_pool,
1024                                 EFI_LOADER_DATA, sizeof(*gdt),
1025                                 (void **)&gdt);
1026         if (status != EFI_SUCCESS) {
1027                 efi_printk("Failed to alloc mem for gdt structure\n");
1028                 goto fail;
1029         }
1030
1031         gdt->size = 0x800;
1032         status = low_alloc(gdt->size, 8, (unsigned long *)&gdt->address);
1033         if (status != EFI_SUCCESS) {
1034                 efi_printk("Failed to alloc mem for gdt\n");
1035                 goto fail;
1036         }
1037
1038         status = efi_call_phys3(sys_table->boottime->allocate_pool,
1039                                 EFI_LOADER_DATA, sizeof(*idt),
1040                                 (void **)&idt);
1041         if (status != EFI_SUCCESS) {
1042                 efi_printk("Failed to alloc mem for idt structure\n");
1043                 goto fail;
1044         }
1045
1046         idt->size = 0;
1047         idt->address = 0;
1048
1049         /*
1050          * If the kernel isn't already loaded at the preferred load
1051          * address, relocate it.
1052          */
1053         if (hdr->pref_address != hdr->code32_start) {
1054                 status = relocate_kernel(hdr);
1055
1056                 if (status != EFI_SUCCESS)
1057                         goto fail;
1058         }
1059
1060         status = exit_boot(boot_params, handle);
1061         if (status != EFI_SUCCESS)
1062                 goto fail;
1063
1064         memset((char *)gdt->address, 0x0, gdt->size);
1065         desc = (struct desc_struct *)gdt->address;
1066
1067         /* The first GDT is a dummy and the second is unused. */
1068         desc += 2;
1069
1070         desc->limit0 = 0xffff;
1071         desc->base0 = 0x0000;
1072         desc->base1 = 0x0000;
1073         desc->type = SEG_TYPE_CODE | SEG_TYPE_EXEC_READ;
1074         desc->s = DESC_TYPE_CODE_DATA;
1075         desc->dpl = 0;
1076         desc->p = 1;
1077         desc->limit = 0xf;
1078         desc->avl = 0;
1079         desc->l = 0;
1080         desc->d = SEG_OP_SIZE_32BIT;
1081         desc->g = SEG_GRANULARITY_4KB;
1082         desc->base2 = 0x00;
1083
1084         desc++;
1085         desc->limit0 = 0xffff;
1086         desc->base0 = 0x0000;
1087         desc->base1 = 0x0000;
1088         desc->type = SEG_TYPE_DATA | SEG_TYPE_READ_WRITE;
1089         desc->s = DESC_TYPE_CODE_DATA;
1090         desc->dpl = 0;
1091         desc->p = 1;
1092         desc->limit = 0xf;
1093         desc->avl = 0;
1094         desc->l = 0;
1095         desc->d = SEG_OP_SIZE_32BIT;
1096         desc->g = SEG_GRANULARITY_4KB;
1097         desc->base2 = 0x00;
1098
1099 #ifdef CONFIG_X86_64
1100         /* Task segment value */
1101         desc++;
1102         desc->limit0 = 0x0000;
1103         desc->base0 = 0x0000;
1104         desc->base1 = 0x0000;
1105         desc->type = SEG_TYPE_TSS;
1106         desc->s = 0;
1107         desc->dpl = 0;
1108         desc->p = 1;
1109         desc->limit = 0x0;
1110         desc->avl = 0;
1111         desc->l = 0;
1112         desc->d = 0;
1113         desc->g = SEG_GRANULARITY_4KB;
1114         desc->base2 = 0x00;
1115 #endif /* CONFIG_X86_64 */
1116
1117         asm volatile ("lidt %0" : : "m" (*idt));
1118         asm volatile ("lgdt %0" : : "m" (*gdt));
1119
1120         asm volatile("cli");
1121
1122         return boot_params;
1123 fail:
1124         return NULL;
1125 }