arch/x86/boot/compressed/eboot.c

   1 /* -----------------------------------------------------------------------
   2  *
   3  *   Copyright 2011 Intel Corporation; author Matt Fleming
   4  *
   5  *   This file is part of the Linux kernel, and is made available under
   6  *   the terms of the GNU General Public License version 2.
   7  *
   8  * ----------------------------------------------------------------------- */
   9
  10 #include <linux/efi.h>
  11 #include <linux/pci.h>
  12 #include <asm/efi.h>
  13 #include <asm/setup.h>
  14 #include <asm/desc.h>
  15
  16 #undef memcpy                   /* Use memcpy from misc.c */
  17
  18 #include "eboot.h"
  19
  20 static efi_system_table_t *sys_table;
  21
  22 static void efi_printk(char *str)
  23 {
  24         char *s8;
  25
  26         for (s8 = str; *s8; s8++) {
  27                 struct efi_simple_text_output_protocol *out;
  28                 efi_char16_t ch[2] = { 0 };
  29
  30                 ch[0] = *s8;
  31                 out = (struct efi_simple_text_output_protocol *)sys_table->con_out;
  32
  33                 if (*s8 == '\n') {
  34                         efi_char16_t nl[2] = { '\r', 0 };
  35                         efi_call_phys2(out->output_string, out, nl);
  36                 }
  37
  38                 efi_call_phys2(out->output_string, out, ch);
  39         }
  40 }
  41
  42 static efi_status_t __get_map(efi_memory_desc_t **map, unsigned long *map_size,
  43                               unsigned long *desc_size)
  44 {
  45         efi_memory_desc_t *m = NULL;
  46         efi_status_t status;
  47         unsigned long key;
  48         u32 desc_version;
  49
  50         *map_size = sizeof(*m) * 32;
  51 again:
  52         /*
  53          * Add an additional efi_memory_desc_t because we're doing an
  54          * allocation which may be in a new descriptor region.
  55          */
  56         *map_size += sizeof(*m);
  57         status = efi_call_phys3(sys_table->boottime->allocate_pool,
  58                                 EFI_LOADER_DATA, *map_size, (void **)&m);
  59         if (status != EFI_SUCCESS)
  60                 goto fail;
  61
  62         status = efi_call_phys5(sys_table->boottime->get_memory_map, map_size,
  63                                 m, &key, desc_size, &desc_version);
  64         if (status == EFI_BUFFER_TOO_SMALL) {
  65                 efi_call_phys1(sys_table->boottime->free_pool, m);
  66                 goto again;
  67         }
  68
  69         if (status != EFI_SUCCESS)
  70                 efi_call_phys1(sys_table->boottime->free_pool, m);
  71
  72 fail:
  73         *map = m;
  74         return status;
  75 }
  76
  77 /*
  78  * Allocate at the highest possible address that is not above 'max'.
  79  */
  80 static efi_status_t high_alloc(unsigned long size, unsigned long align,
  81                               unsigned long *addr, unsigned long max)
  82 {
  83         unsigned long map_size, desc_size;
  84         efi_memory_desc_t *map;
  85         efi_status_t status;
  86         unsigned long nr_pages;
  87         u64 max_addr = 0;
  88         int i;
  89
  90         status = __get_map(&map, &map_size, &desc_size);
  91         if (status != EFI_SUCCESS)
  92                 goto fail;
  93
  94         nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
  95 again:
  96         for (i = 0; i < map_size / desc_size; i++) {
  97                 efi_memory_desc_t *desc;
  98                 unsigned long m = (unsigned long)map;
  99                 u64 start, end;
 100
 101                 desc = (efi_memory_desc_t *)(m + (i * desc_size));
 102                 if (desc->type != EFI_CONVENTIONAL_MEMORY)
 103                         continue;
 104
 105                 if (desc->num_pages < nr_pages)
 106                         continue;
 107
 108                 start = desc->phys_addr;
 109                 end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT);
 110
 111                 if ((start + size) > end || (start + size) > max)
 112                         continue;
 113
 114                 if (end - size > max)
 115                         end = max;
 116
 117                 if (round_down(end - size, align) < start)
 118                         continue;
 119
 120                 start = round_down(end - size, align);
 121
 122                 /*
 123                  * Don't allocate at 0x0. It will confuse code that
 124                  * checks pointers against NULL.
 125                  */
 126                 if (start == 0x0)
 127                         continue;
 128
 129                 if (start > max_addr)
 130                         max_addr = start;
 131         }
 132
 133         if (!max_addr)
 134                 status = EFI_NOT_FOUND;
 135         else {
 136                 status = efi_call_phys4(sys_table->boottime->allocate_pages,
 137                                         EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
 138                                         nr_pages, &max_addr);
 139                 if (status != EFI_SUCCESS) {
 140                         max = max_addr;
 141                         max_addr = 0;
 142                         goto again;
 143                 }
 144
 145                 *addr = max_addr;
 146         }
 147
 148 free_pool:
 149         efi_call_phys1(sys_table->boottime->free_pool, map);
 150
 151 fail:
 152         return status;
 153 }
 154
 155 /*
 156  * Allocate at the lowest possible address.
 157  */
 158 static efi_status_t low_alloc(unsigned long size, unsigned long align,
 159                               unsigned long *addr)
 160 {
 161         unsigned long map_size, desc_size;
 162         efi_memory_desc_t *map;
 163         efi_status_t status;
 164         unsigned long nr_pages;
 165         int i;
 166
 167         status = __get_map(&map, &map_size, &desc_size);
 168         if (status != EFI_SUCCESS)
 169                 goto fail;
 170
 171         nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
 172         for (i = 0; i < map_size / desc_size; i++) {
 173                 efi_memory_desc_t *desc;
 174                 unsigned long m = (unsigned long)map;
 175                 u64 start, end;
 176
 177                 desc = (efi_memory_desc_t *)(m + (i * desc_size));
 178
 179                 if (desc->type != EFI_CONVENTIONAL_MEMORY)
 180                         continue;
 181
 182                 if (desc->num_pages < nr_pages)
 183                         continue;
 184
 185                 start = desc->phys_addr;
 186                 end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT);
 187
 188                 /*
 189                  * Don't allocate at 0x0. It will confuse code that
 190                  * checks pointers against NULL. Skip the first 8
 191                  * bytes so we start at a nice even number.
 192                  */
 193                 if (start == 0x0)
 194                         start += 8;
 195
 196                 start = round_up(start, align);
 197                 if ((start + size) > end)
 198                         continue;
 199
 200                 status = efi_call_phys4(sys_table->boottime->allocate_pages,
 201                                         EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
 202                                         nr_pages, &start);
 203                 if (status == EFI_SUCCESS) {
 204                         *addr = start;
 205                         break;
 206                 }
 207         }
 208
 209         if (i == map_size / desc_size)
 210                 status = EFI_NOT_FOUND;
 211
 212 free_pool:
 213         efi_call_phys1(sys_table->boottime->free_pool, map);
 214 fail:
 215         return status;
 216 }
 217
 218 static void low_free(unsigned long size, unsigned long addr)
 219 {
 220         unsigned long nr_pages;
 221
 222         nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
 223         efi_call_phys2(sys_table->boottime->free_pages, addr, size);
 224 }
 225
 226 static void find_bits(unsigned long mask, u8 *pos, u8 *size)
 227 {
 228         u8 first, len;
 229
 230         first = 0;
 231         len = 0;
 232
 233         if (mask) {
 234                 while (!(mask & 0x1)) {
 235                         mask = mask >> 1;
 236                         first++;
 237                 }
 238
 239                 while (mask & 0x1) {
 240                         mask = mask >> 1;
 241                         len++;
 242                 }
 243         }
 244
 245         *pos = first;
 246         *size = len;
 247 }
 248
 249 static efi_status_t setup_efi_pci(struct boot_params *params)
 250 {
 251         efi_pci_io_protocol *pci;
 252         efi_status_t status;
 253         void **pci_handle;
 254         efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
 255         unsigned long nr_pci, size = 0;
 256         int i;
 257         struct setup_data *data;
 258
 259         data = (struct setup_data *)params->hdr.setup_data;
 260
 261         while (data && data->next)
 262                 data = (struct setup_data *)data->next;
 263
 264         status = efi_call_phys5(sys_table->boottime->locate_handle,
 265                                 EFI_LOCATE_BY_PROTOCOL, &pci_proto,
 266                                 NULL, &size, pci_handle);
 267
 268         if (status == EFI_BUFFER_TOO_SMALL) {
 269                 status = efi_call_phys3(sys_table->boottime->allocate_pool,
 270                                         EFI_LOADER_DATA, size, &pci_handle);
 271
 272                 if (status != EFI_SUCCESS)
 273                         return status;
 274
 275                 status = efi_call_phys5(sys_table->boottime->locate_handle,
 276                                         EFI_LOCATE_BY_PROTOCOL, &pci_proto,
 277                                         NULL, &size, pci_handle);
 278         }
 279
 280         if (status != EFI_SUCCESS)
 281                 goto free_handle;
 282
 283         nr_pci = size / sizeof(void *);
 284         for (i = 0; i < nr_pci; i++) {
 285                 void *h = pci_handle[i];
 286                 uint64_t attributes;
 287                 struct pci_setup_rom *rom;
 288
 289                 status = efi_call_phys3(sys_table->boottime->handle_protocol,
 290                                         h, &pci_proto, &pci);
 291
 292                 if (status != EFI_SUCCESS)
 293                         continue;
 294
 295                 if (!pci)
 296                         continue;
 297
 298                 status = efi_call_phys4(pci->attributes, pci,
 299                                         EfiPciIoAttributeOperationGet, 0,
 300                                         &attributes);
 301
 302                 if (status != EFI_SUCCESS)
 303                         continue;
 304
 305                 if (!attributes & EFI_PCI_IO_ATTRIBUTE_EMBEDDED_ROM)
 306                         continue;
 307
 308                 if (!pci->romimage || !pci->romsize)
 309                         continue;
 310
 311                 size = pci->romsize + sizeof(*rom);
 312
 313                 status = efi_call_phys3(sys_table->boottime->allocate_pool,
 314                                 EFI_LOADER_DATA, size, &rom);
 315
 316                 if (status != EFI_SUCCESS)
 317                         continue;
 318
 319                 rom->data.type = SETUP_PCI;
 320                 rom->data.len = size - sizeof(struct setup_data);
 321                 rom->data.next = 0;
 322                 rom->pcilen = pci->romsize;
 323
 324                 status = efi_call_phys5(pci->pci.read, pci,
 325                                         EfiPciIoWidthUint16, PCI_VENDOR_ID,
 326                                         1, &(rom->vendor));
 327
 328                 if (status != EFI_SUCCESS)
 329                         goto free_struct;
 330
 331                 status = efi_call_phys5(pci->pci.read, pci,
 332                                         EfiPciIoWidthUint16, PCI_DEVICE_ID,
 333                                         1, &(rom->devid));
 334
 335                 if (status != EFI_SUCCESS)
 336                         goto free_struct;
 337
 338                 status = efi_call_phys5(pci->get_location, pci,
 339                                         &(rom->segment), &(rom->bus),
 340                                         &(rom->device), &(rom->function));
 341
 342                 if (status != EFI_SUCCESS)
 343                         goto free_struct;
 344
 345                 memcpy(rom->romdata, pci->romimage, pci->romsize);
 346
 347                 if (data)
 348                         data->next = (uint64_t)rom;
 349                 else
 350                         params->hdr.setup_data = (uint64_t)rom;
 351
 352                 data = (struct setup_data *)rom;
 353
 354                 continue;
 355         free_struct:
 356                 efi_call_phys1(sys_table->boottime->free_pool, rom);
 357         }
 358
 359 free_handle:
 360         efi_call_phys1(sys_table->boottime->free_pool, pci_handle);
 361         return status;
 362 }
 363
 364 /*
 365  * See if we have Graphics Output Protocol
 366  */
 367 static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto,
 368                               unsigned long size)
 369 {
 370         struct efi_graphics_output_protocol *gop, *first_gop;
 371         struct efi_pixel_bitmask pixel_info;
 372         unsigned long nr_gops;
 373         efi_status_t status;
 374         void **gop_handle;
 375         u16 width, height;
 376         u32 fb_base, fb_size;
 377         u32 pixels_per_scan_line;
 378         int pixel_format;
 379         int i;
 380
 381         status = efi_call_phys3(sys_table->boottime->allocate_pool,
 382                                 EFI_LOADER_DATA, size, &gop_handle);
 383         if (status != EFI_SUCCESS)
 384                 return status;
 385
 386         status = efi_call_phys5(sys_table->boottime->locate_handle,
 387                                 EFI_LOCATE_BY_PROTOCOL, proto,
 388                                 NULL, &size, gop_handle);
 389         if (status != EFI_SUCCESS)
 390                 goto free_handle;
 391
 392         first_gop = NULL;
 393
 394         nr_gops = size / sizeof(void *);
 395         for (i = 0; i < nr_gops; i++) {
 396                 struct efi_graphics_output_mode_info *info;
 397                 efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
 398                 bool conout_found = false;
 399                 void *dummy;
 400                 void *h = gop_handle[i];
 401
 402                 status = efi_call_phys3(sys_table->boottime->handle_protocol,
 403                                         h, proto, &gop);
 404                 if (status != EFI_SUCCESS)
 405                         continue;
 406
 407                 status = efi_call_phys3(sys_table->boottime->handle_protocol,
 408                                         h, &conout_proto, &dummy);
 409
 410                 if (status == EFI_SUCCESS)
 411                         conout_found = true;
 412
 413                 status = efi_call_phys4(gop->query_mode, gop,
 414                                         gop->mode->mode, &size, &info);
 415                 if (status == EFI_SUCCESS && (!first_gop || conout_found)) {
 416                         /*
 417                          * Systems that use the UEFI Console Splitter may
 418                          * provide multiple GOP devices, not all of which are
 419                          * backed by real hardware. The workaround is to search
 420                          * for a GOP implementing the ConOut protocol, and if
 421                          * one isn't found, to just fall back to the first GOP.
 422                          */
 423                         width = info->horizontal_resolution;
 424                         height = info->vertical_resolution;
 425                         fb_base = gop->mode->frame_buffer_base;
 426                         fb_size = gop->mode->frame_buffer_size;
 427                         pixel_format = info->pixel_format;
 428                         pixel_info = info->pixel_information;
 429                         pixels_per_scan_line = info->pixels_per_scan_line;
 430
 431                         /*
 432                          * Once we've found a GOP supporting ConOut,
 433                          * don't bother looking any further.
 434                          */
 435                         if (conout_found)
 436                                 break;
 437
 438                         first_gop = gop;
 439                 }
 440         }
 441
 442         /* Did we find any GOPs? */
 443         if (!first_gop)
 444                 goto free_handle;
 445
 446         /* EFI framebuffer */
 447         si->orig_video_isVGA = VIDEO_TYPE_EFI;
 448
 449         si->lfb_width = width;
 450         si->lfb_height = height;
 451         si->lfb_base = fb_base;
 452         si->pages = 1;
 453
 454         if (pixel_format == PIXEL_RGB_RESERVED_8BIT_PER_COLOR) {
 455                 si->lfb_depth = 32;
 456                 si->lfb_linelength = pixels_per_scan_line * 4;
 457                 si->red_size = 8;
 458                 si->red_pos = 0;
 459                 si->green_size = 8;
 460                 si->green_pos = 8;
 461                 si->blue_size = 8;
 462                 si->blue_pos = 16;
 463                 si->rsvd_size = 8;
 464                 si->rsvd_pos = 24;
 465         } else if (pixel_format == PIXEL_BGR_RESERVED_8BIT_PER_COLOR) {
 466                 si->lfb_depth = 32;
 467                 si->lfb_linelength = pixels_per_scan_line * 4;
 468                 si->red_size = 8;
 469                 si->red_pos = 16;
 470                 si->green_size = 8;
 471                 si->green_pos = 8;
 472                 si->blue_size = 8;
 473                 si->blue_pos = 0;
 474                 si->rsvd_size = 8;
 475                 si->rsvd_pos = 24;
 476         } else if (pixel_format == PIXEL_BIT_MASK) {
 477                 find_bits(pixel_info.red_mask, &si->red_pos, &si->red_size);
 478                 find_bits(pixel_info.green_mask, &si->green_pos,
 479                           &si->green_size);
 480                 find_bits(pixel_info.blue_mask, &si->blue_pos, &si->blue_size);
 481                 find_bits(pixel_info.reserved_mask, &si->rsvd_pos,
 482                           &si->rsvd_size);
 483                 si->lfb_depth = si->red_size + si->green_size +
 484                         si->blue_size + si->rsvd_size;
 485                 si->lfb_linelength = (pixels_per_scan_line * si->lfb_depth) / 8;
 486         } else {
 487                 si->lfb_depth = 4;
 488                 si->lfb_linelength = si->lfb_width / 2;
 489                 si->red_size = 0;
 490                 si->red_pos = 0;
 491                 si->green_size = 0;
 492                 si->green_pos = 0;
 493                 si->blue_size = 0;
 494                 si->blue_pos = 0;
 495                 si->rsvd_size = 0;
 496                 si->rsvd_pos = 0;
 497         }
 498
 499         si->lfb_size = si->lfb_linelength * si->lfb_height;
 500
 501         si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
 502
 503 free_handle:
 504         efi_call_phys1(sys_table->boottime->free_pool, gop_handle);
 505         return status;
 506 }
 507
 508 /*
 509  * See if we have Universal Graphics Adapter (UGA) protocol
 510  */
 511 static efi_status_t setup_uga(struct screen_info *si, efi_guid_t *uga_proto,
 512                               unsigned long size)
 513 {
 514         struct efi_uga_draw_protocol *uga, *first_uga;
 515         unsigned long nr_ugas;
 516         efi_status_t status;
 517         u32 width, height;
 518         void **uga_handle = NULL;
 519         int i;
 520
 521         status = efi_call_phys3(sys_table->boottime->allocate_pool,
 522                                 EFI_LOADER_DATA, size, &uga_handle);
 523         if (status != EFI_SUCCESS)
 524                 return status;
 525
 526         status = efi_call_phys5(sys_table->boottime->locate_handle,
 527                                 EFI_LOCATE_BY_PROTOCOL, uga_proto,
 528                                 NULL, &size, uga_handle);
 529         if (status != EFI_SUCCESS)
 530                 goto free_handle;
 531
 532         first_uga = NULL;
 533
 534         nr_ugas = size / sizeof(void *);
 535         for (i = 0; i < nr_ugas; i++) {
 536                 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
 537                 void *handle = uga_handle[i];
 538                 u32 w, h, depth, refresh;
 539                 void *pciio;
 540
 541                 status = efi_call_phys3(sys_table->boottime->handle_protocol,
 542                                         handle, uga_proto, &uga);
 543                 if (status != EFI_SUCCESS)
 544                         continue;
 545
 546                 efi_call_phys3(sys_table->boottime->handle_protocol,
 547                                handle, &pciio_proto, &pciio);
 548
 549                 status = efi_call_phys5(uga->get_mode, uga, &w, &h,
 550                                         &depth, &refresh);
 551                 if (status == EFI_SUCCESS && (!first_uga || pciio)) {
 552                         width = w;
 553                         height = h;
 554
 555                         /*
 556                          * Once we've found a UGA supporting PCIIO,
 557                          * don't bother looking any further.
 558                          */
 559                         if (pciio)
 560                                 break;
 561
 562                         first_uga = uga;
 563                 }
 564         }
 565
 566         if (!first_uga)
 567                 goto free_handle;
 568
 569         /* EFI framebuffer */
 570         si->orig_video_isVGA = VIDEO_TYPE_EFI;
 571
 572         si->lfb_depth = 32;
 573         si->lfb_width = width;
 574         si->lfb_height = height;
 575
 576         si->red_size = 8;
 577         si->red_pos = 16;
 578         si->green_size = 8;
 579         si->green_pos = 8;
 580         si->blue_size = 8;
 581         si->blue_pos = 0;
 582         si->rsvd_size = 8;
 583         si->rsvd_pos = 24;
 584
 585
 586 free_handle:
 587         efi_call_phys1(sys_table->boottime->free_pool, uga_handle);
 588         return status;
 589 }
 590
 591 void setup_graphics(struct boot_params *boot_params)
 592 {
 593         efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
 594         struct screen_info *si;
 595         efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
 596         efi_status_t status;
 597         unsigned long size;
 598         void **gop_handle = NULL;
 599         void **uga_handle = NULL;
 600
 601         si = &boot_params->screen_info;
 602         memset(si, 0, sizeof(*si));
 603
 604         size = 0;
 605         status = efi_call_phys5(sys_table->boottime->locate_handle,
 606                                 EFI_LOCATE_BY_PROTOCOL, &graphics_proto,
 607                                 NULL, &size, gop_handle);
 608         if (status == EFI_BUFFER_TOO_SMALL)
 609                 status = setup_gop(si, &graphics_proto, size);
 610
 611         if (status != EFI_SUCCESS) {
 612                 size = 0;
 613                 status = efi_call_phys5(sys_table->boottime->locate_handle,
 614                                         EFI_LOCATE_BY_PROTOCOL, &uga_proto,
 615                                         NULL, &size, uga_handle);
 616                 if (status == EFI_BUFFER_TOO_SMALL)
 617                         setup_uga(si, &uga_proto, size);
 618         }
 619 }
 620
 621 struct initrd {
 622         efi_file_handle_t *handle;
 623         u64 size;
 624 };
 625
 626 /*
 627  * Check the cmdline for a LILO-style initrd= arguments.
 628  *
 629  * We only support loading an initrd from the same filesystem as the
 630  * kernel image.
 631  */
 632 static efi_status_t handle_ramdisks(efi_loaded_image_t *image,
 633                                     struct setup_header *hdr)
 634 {
 635         struct initrd *initrds;
 636         unsigned long initrd_addr;
 637         efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
 638         u64 initrd_total;
 639         efi_file_io_interface_t *io;
 640         efi_file_handle_t *fh;
 641         efi_status_t status;
 642         int nr_initrds;
 643         char *str;
 644         int i, j, k;
 645
 646         initrd_addr = 0;
 647         initrd_total = 0;
 648
 649         str = (char *)(unsigned long)hdr->cmd_line_ptr;
 650
 651         j = 0;                  /* See close_handles */
 652
 653         if (!str || !*str)
 654                 return EFI_SUCCESS;
 655
 656         for (nr_initrds = 0; *str; nr_initrds++) {
 657                 str = strstr(str, "initrd=");
 658                 if (!str)
 659                         break;
 660
 661                 str += 7;
 662
 663                 /* Skip any leading slashes */
 664                 while (*str == '/' || *str == '\\')
 665                         str++;
 666
 667                 while (*str && *str != ' ' && *str != '\n')
 668                         str++;
 669         }
 670
 671         if (!nr_initrds)
 672                 return EFI_SUCCESS;
 673
 674         status = efi_call_phys3(sys_table->boottime->allocate_pool,
 675                                 EFI_LOADER_DATA,
 676                                 nr_initrds * sizeof(*initrds),
 677                                 &initrds);
 678         if (status != EFI_SUCCESS) {
 679                 efi_printk("Failed to alloc mem for initrds\n");
 680                 goto fail;
 681         }
 682
 683         str = (char *)(unsigned long)hdr->cmd_line_ptr;
 684         for (i = 0; i < nr_initrds; i++) {
 685                 struct initrd *initrd;
 686                 efi_file_handle_t *h;
 687                 efi_file_info_t *info;
 688                 efi_char16_t filename_16[256];
 689                 unsigned long info_sz;
 690                 efi_guid_t info_guid = EFI_FILE_INFO_ID;
 691                 efi_char16_t *p;
 692                 u64 file_sz;
 693
 694                 str = strstr(str, "initrd=");
 695                 if (!str)
 696                         break;
 697
 698                 str += 7;
 699
 700                 initrd = &initrds[i];
 701                 p = filename_16;
 702
 703                 /* Skip any leading slashes */
 704                 while (*str == '/' || *str == '\\')
 705                         str++;
 706
 707                 while (*str && *str != ' ' && *str != '\n') {
 708                         if ((u8 *)p >= (u8 *)filename_16 + sizeof(filename_16))
 709                                 break;
 710
 711                         *p++ = *str++;
 712                 }
 713
 714                 *p = '\0';
 715
 716                 /* Only open the volume once. */
 717                 if (!i) {
 718                         efi_boot_services_t *boottime;
 719
 720                         boottime = sys_table->boottime;
 721
 722                         status = efi_call_phys3(boottime->handle_protocol,
 723                                         image->device_handle, &fs_proto, &io);
 724                         if (status != EFI_SUCCESS) {
 725                                 efi_printk("Failed to handle fs_proto\n");
 726                                 goto free_initrds;
 727                         }
 728
 729                         status = efi_call_phys2(io->open_volume, io, &fh);
 730                         if (status != EFI_SUCCESS) {
 731                                 efi_printk("Failed to open volume\n");
 732                                 goto free_initrds;
 733                         }
 734                 }
 735
 736                 status = efi_call_phys5(fh->open, fh, &h, filename_16,
 737                                         EFI_FILE_MODE_READ, (u64)0);
 738                 if (status != EFI_SUCCESS) {
 739                         efi_printk("Failed to open initrd file\n");
 740                         goto close_handles;
 741                 }
 742
 743                 initrd->handle = h;
 744
 745                 info_sz = 0;
 746                 status = efi_call_phys4(h->get_info, h, &info_guid,
 747                                         &info_sz, NULL);
 748                 if (status != EFI_BUFFER_TOO_SMALL) {
 749                         efi_printk("Failed to get initrd info size\n");
 750                         goto close_handles;
 751                 }
 752
 753 grow:
 754                 status = efi_call_phys3(sys_table->boottime->allocate_pool,
 755                                         EFI_LOADER_DATA, info_sz, &info);
 756                 if (status != EFI_SUCCESS) {
 757                         efi_printk("Failed to alloc mem for initrd info\n");
 758                         goto close_handles;
 759                 }
 760
 761                 status = efi_call_phys4(h->get_info, h, &info_guid,
 762                                         &info_sz, info);
 763                 if (status == EFI_BUFFER_TOO_SMALL) {
 764                         efi_call_phys1(sys_table->boottime->free_pool, info);
 765                         goto grow;
 766                 }
 767
 768                 file_sz = info->file_size;
 769                 efi_call_phys1(sys_table->boottime->free_pool, info);
 770
 771                 if (status != EFI_SUCCESS) {
 772                         efi_printk("Failed to get initrd info\n");
 773                         goto close_handles;
 774                 }
 775
 776                 initrd->size = file_sz;
 777                 initrd_total += file_sz;
 778         }
 779
 780         if (initrd_total) {
 781                 unsigned long addr;
 782
 783                 /*
 784                  * Multiple initrd's need to be at consecutive
 785                  * addresses in memory, so allocate enough memory for
 786                  * all the initrd's.
 787                  */
 788                 status = high_alloc(initrd_total, 0x1000,
 789                                    &initrd_addr, hdr->initrd_addr_max);
 790                 if (status != EFI_SUCCESS) {
 791                         efi_printk("Failed to alloc highmem for initrds\n");
 792                         goto close_handles;
 793                 }
 794
 795                 /* We've run out of free low memory. */
 796                 if (initrd_addr > hdr->initrd_addr_max) {
 797                         efi_printk("We've run out of free low memory\n");
 798                         status = EFI_INVALID_PARAMETER;
 799                         goto free_initrd_total;
 800                 }
 801
 802                 addr = initrd_addr;
 803                 for (j = 0; j < nr_initrds; j++) {
 804                         u64 size;
 805
 806                         size = initrds[j].size;
 807                         while (size) {
 808                                 u64 chunksize;
 809                                 if (size > EFI_READ_CHUNK_SIZE)
 810                                         chunksize = EFI_READ_CHUNK_SIZE;
 811                                 else
 812                                         chunksize = size;
 813                                 status = efi_call_phys3(fh->read,
 814                                                         initrds[j].handle,
 815                                                         &chunksize, addr);
 816                                 if (status != EFI_SUCCESS) {
 817                                         efi_printk("Failed to read initrd\n");
 818                                         goto free_initrd_total;
 819                                 }
 820                                 addr += chunksize;
 821                                 size -= chunksize;
 822                         }
 823
 824                         efi_call_phys1(fh->close, initrds[j].handle);
 825                 }
 826
 827         }
 828
 829         efi_call_phys1(sys_table->boottime->free_pool, initrds);
 830
 831         hdr->ramdisk_image = initrd_addr;
 832         hdr->ramdisk_size = initrd_total;
 833
 834         return status;
 835
 836 free_initrd_total:
 837         low_free(initrd_total, initrd_addr);
 838
 839 close_handles:
 840         for (k = j; k < i; k++)
 841                 efi_call_phys1(fh->close, initrds[k].handle);
 842 free_initrds:
 843         efi_call_phys1(sys_table->boottime->free_pool, initrds);
 844 fail:
 845         hdr->ramdisk_image = 0;
 846         hdr->ramdisk_size = 0;
 847
 848         return status;
 849 }
 850
 851 /*
 852  * Because the x86 boot code expects to be passed a boot_params we
 853  * need to create one ourselves (usually the bootloader would create
 854  * one for us).
 855  */
 856 struct boot_params *make_boot_params(void *handle, efi_system_table_t *_table)
 857 {
 858         struct boot_params *boot_params;
 859         struct sys_desc_table *sdt;
 860         struct apm_bios_info *bi;
 861         struct setup_header *hdr;
 862         struct efi_info *efi;
 863         efi_loaded_image_t *image;
 864         void *options;
 865         u32 load_options_size;
 866         efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
 867         int options_size = 0;
 868         efi_status_t status;
 869         unsigned long cmdline;
 870         u16 *s2;
 871         u8 *s1;
 872         int i;
 873
 874         sys_table = _table;
 875
 876         /* Check if we were booted by the EFI firmware */
 877         if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
 878                 return NULL;
 879
 880         status = efi_call_phys3(sys_table->boottime->handle_protocol,
 881                                 handle, &proto, (void *)&image);
 882         if (status != EFI_SUCCESS) {
 883                 efi_printk("Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
 884                 return NULL;
 885         }
 886
 887         status = low_alloc(0x4000, 1, (unsigned long *)&boot_params);
 888         if (status != EFI_SUCCESS) {
 889                 efi_printk("Failed to alloc lowmem for boot params\n");
 890                 return NULL;
 891         }
 892
 893         memset(boot_params, 0x0, 0x4000);
 894
 895         hdr = &boot_params->hdr;
 896         efi = &boot_params->efi_info;
 897         bi = &boot_params->apm_bios_info;
 898         sdt = &boot_params->sys_desc_table;
 899
 900         /* Copy the second sector to boot_params */
 901         memcpy(&hdr->jump, image->image_base + 512, 512);
 902
 903         /*
 904          * Fill out some of the header fields ourselves because the
 905          * EFI firmware loader doesn't load the first sector.
 906          */
 907         hdr->root_flags = 1;
 908         hdr->vid_mode = 0xffff;
 909         hdr->boot_flag = 0xAA55;
 910
 911         hdr->code32_start = (__u64)(unsigned long)image->image_base;
 912
 913         hdr->type_of_loader = 0x21;
 914
 915         /* Convert unicode cmdline to ascii */
 916         options = image->load_options;
 917         load_options_size = image->load_options_size / 2; /* ASCII */
 918         cmdline = 0;
 919         s2 = (u16 *)options;
 920
 921         if (s2) {
 922                 while (*s2 && *s2 != '\n' && options_size < load_options_size) {
 923                         s2++;
 924                         options_size++;
 925                 }
 926
 927                 if (options_size) {
 928                         if (options_size > hdr->cmdline_size)
 929                                 options_size = hdr->cmdline_size;
 930
 931                         options_size++; /* NUL termination */
 932
 933                         status = low_alloc(options_size, 1, &cmdline);
 934                         if (status != EFI_SUCCESS) {
 935                                 efi_printk("Failed to alloc mem for cmdline\n");
 936                                 goto fail;
 937                         }
 938
 939                         s1 = (u8 *)(unsigned long)cmdline;
 940                         s2 = (u16 *)options;
 941
 942                         for (i = 0; i < options_size - 1; i++)
 943                                 *s1++ = *s2++;
 944
 945                         *s1 = '\0';
 946                 }
 947         }
 948
 949         hdr->cmd_line_ptr = cmdline;
 950
 951         hdr->ramdisk_image = 0;
 952         hdr->ramdisk_size = 0;
 953
 954         /* Clear APM BIOS info */
 955         memset(bi, 0, sizeof(*bi));
 956
 957         memset(sdt, 0, sizeof(*sdt));
 958
 959         status = handle_ramdisks(image, hdr);
 960         if (status != EFI_SUCCESS)
 961                 goto fail2;
 962
 963         return boot_params;
 964 fail2:
 965         if (options_size)
 966                 low_free(options_size, hdr->cmd_line_ptr);
 967 fail:
 968         low_free(0x4000, (unsigned long)boot_params);
 969         return NULL;
 970 }
 971
 972 static efi_status_t exit_boot(struct boot_params *boot_params,
 973                               void *handle)
 974 {
 975         struct efi_info *efi = &boot_params->efi_info;
 976         struct e820entry *e820_map = &boot_params->e820_map[0];
 977         struct e820entry *prev = NULL;
 978         unsigned long size, key, desc_size, _size;
 979         efi_memory_desc_t *mem_map;
 980         efi_status_t status;
 981         __u32 desc_version;
 982         u8 nr_entries;
 983         int i;
 984
 985         size = sizeof(*mem_map) * 32;
 986
 987 again:
 988         size += sizeof(*mem_map);
 989         _size = size;
 990         status = low_alloc(size, 1, (unsigned long *)&mem_map);
 991         if (status != EFI_SUCCESS)
 992                 return status;
 993
 994         status = efi_call_phys5(sys_table->boottime->get_memory_map, &size,
 995                                 mem_map, &key, &desc_size, &desc_version);
 996         if (status == EFI_BUFFER_TOO_SMALL) {
 997                 low_free(_size, (unsigned long)mem_map);
 998                 goto again;
 999         }
1000
1001         if (status != EFI_SUCCESS)
1002                 goto free_mem_map;
1003
1004         memcpy(&efi->efi_loader_signature, EFI_LOADER_SIGNATURE, sizeof(__u32));
1005         efi->efi_systab = (unsigned long)sys_table;
1006         efi->efi_memdesc_size = desc_size;
1007         efi->efi_memdesc_version = desc_version;
1008         efi->efi_memmap = (unsigned long)mem_map;
1009         efi->efi_memmap_size = size;
1010
1011 #ifdef CONFIG_X86_64
1012         efi->efi_systab_hi = (unsigned long)sys_table >> 32;
1013         efi->efi_memmap_hi = (unsigned long)mem_map >> 32;
1014 #endif
1015
1016         /* Might as well exit boot services now */
1017         status = efi_call_phys2(sys_table->boottime->exit_boot_services,
1018                                 handle, key);
1019         if (status != EFI_SUCCESS)
1020                 goto free_mem_map;
1021
1022         /* Historic? */
1023         boot_params->alt_mem_k = 32 * 1024;
1024
1025         /*
1026          * Convert the EFI memory map to E820.
1027          */
1028         nr_entries = 0;
1029         for (i = 0; i < size / desc_size; i++) {
1030                 efi_memory_desc_t *d;
1031                 unsigned int e820_type = 0;
1032                 unsigned long m = (unsigned long)mem_map;
1033
1034                 d = (efi_memory_desc_t *)(m + (i * desc_size));
1035                 switch (d->type) {
1036                 case EFI_RESERVED_TYPE:
1037                 case EFI_RUNTIME_SERVICES_CODE:
1038                 case EFI_RUNTIME_SERVICES_DATA:
1039                 case EFI_MEMORY_MAPPED_IO:
1040                 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1041                 case EFI_PAL_CODE:
1042                         e820_type = E820_RESERVED;
1043                         break;
1044
1045                 case EFI_UNUSABLE_MEMORY:
1046                         e820_type = E820_UNUSABLE;
1047                         break;
1048
1049                 case EFI_ACPI_RECLAIM_MEMORY:
1050                         e820_type = E820_ACPI;
1051                         break;
1052
1053                 case EFI_LOADER_CODE:
1054                 case EFI_LOADER_DATA:
1055                 case EFI_BOOT_SERVICES_CODE:
1056                 case EFI_BOOT_SERVICES_DATA:
1057                 case EFI_CONVENTIONAL_MEMORY:
1058                         e820_type = E820_RAM;
1059                         break;
1060
1061                 case EFI_ACPI_MEMORY_NVS:
1062                         e820_type = E820_NVS;
1063                         break;
1064
1065                 default:
1066                         continue;
1067                 }
1068
1069                 /* Merge adjacent mappings */
1070                 if (prev && prev->type == e820_type &&
1071                     (prev->addr + prev->size) == d->phys_addr)
1072                         prev->size += d->num_pages << 12;
1073                 else {
1074                         e820_map->addr = d->phys_addr;
1075                         e820_map->size = d->num_pages << 12;
1076                         e820_map->type = e820_type;
1077                         prev = e820_map++;
1078                         nr_entries++;
1079                 }
1080         }
1081
1082         boot_params->e820_entries = nr_entries;
1083
1084         return EFI_SUCCESS;
1085
1086 free_mem_map:
1087         low_free(_size, (unsigned long)mem_map);
1088         return status;
1089 }
1090
1091 static efi_status_t relocate_kernel(struct setup_header *hdr)
1092 {
1093         unsigned long start, nr_pages;
1094         efi_status_t status;
1095
1096         /*
1097          * The EFI firmware loader could have placed the kernel image
1098          * anywhere in memory, but the kernel has various restrictions
1099          * on the max physical address it can run at. Attempt to move
1100          * the kernel to boot_params.pref_address, or as low as
1101          * possible.
1102          */
1103         start = hdr->pref_address;
1104         nr_pages = round_up(hdr->init_size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
1105
1106         status = efi_call_phys4(sys_table->boottime->allocate_pages,
1107                                 EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
1108                                 nr_pages, &start);
1109         if (status != EFI_SUCCESS) {
1110                 status = low_alloc(hdr->init_size, hdr->kernel_alignment,
1111                                    &start);
1112                 if (status != EFI_SUCCESS)
1113                         efi_printk("Failed to alloc mem for kernel\n");
1114         }
1115
1116         if (status == EFI_SUCCESS)
1117                 memcpy((void *)start, (void *)(unsigned long)hdr->code32_start,
1118                        hdr->init_size);
1119
1120         hdr->pref_address = hdr->code32_start;
1121         hdr->code32_start = (__u32)start;
1122
1123         return status;
1124 }
1125
1126 /*
1127  * On success we return a pointer to a boot_params structure, and NULL
1128  * on failure.
1129  */
1130 struct boot_params *efi_main(void *handle, efi_system_table_t *_table,
1131                              struct boot_params *boot_params)
1132 {
1133         struct desc_ptr *gdt, *idt;
1134         efi_loaded_image_t *image;
1135         struct setup_header *hdr = &boot_params->hdr;
1136         efi_status_t status;
1137         struct desc_struct *desc;
1138
1139         sys_table = _table;
1140
1141         /* Check if we were booted by the EFI firmware */
1142         if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
1143                 goto fail;
1144
1145         setup_graphics(boot_params);
1146
1147         setup_efi_pci(boot_params);
1148
1149         status = efi_call_phys3(sys_table->boottime->allocate_pool,
1150                                 EFI_LOADER_DATA, sizeof(*gdt),
1151                                 (void **)&gdt);
1152         if (status != EFI_SUCCESS) {
1153                 efi_printk("Failed to alloc mem for gdt structure\n");
1154                 goto fail;
1155         }
1156
1157         gdt->size = 0x800;
1158         status = low_alloc(gdt->size, 8, (unsigned long *)&gdt->address);
1159         if (status != EFI_SUCCESS) {
1160                 efi_printk("Failed to alloc mem for gdt\n");
1161                 goto fail;
1162         }
1163
1164         status = efi_call_phys3(sys_table->boottime->allocate_pool,
1165                                 EFI_LOADER_DATA, sizeof(*idt),
1166                                 (void **)&idt);
1167         if (status != EFI_SUCCESS) {
1168                 efi_printk("Failed to alloc mem for idt structure\n");
1169                 goto fail;
1170         }
1171
1172         idt->size = 0;
1173         idt->address = 0;
1174
1175         /*
1176          * If the kernel isn't already loaded at the preferred load
1177          * address, relocate it.
1178          */
1179         if (hdr->pref_address != hdr->code32_start) {
1180                 status = relocate_kernel(hdr);
1181
1182                 if (status != EFI_SUCCESS)
1183                         goto fail;
1184         }
1185
1186         status = exit_boot(boot_params, handle);
1187         if (status != EFI_SUCCESS)
1188                 goto fail;
1189
1190         memset((char *)gdt->address, 0x0, gdt->size);
1191         desc = (struct desc_struct *)gdt->address;
1192
1193         /* The first GDT is a dummy and the second is unused. */
1194         desc += 2;
1195
1196         desc->limit0 = 0xffff;
1197         desc->base0 = 0x0000;
1198         desc->base1 = 0x0000;
1199         desc->type = SEG_TYPE_CODE | SEG_TYPE_EXEC_READ;
1200         desc->s = DESC_TYPE_CODE_DATA;
1201         desc->dpl = 0;
1202         desc->p = 1;
1203         desc->limit = 0xf;
1204         desc->avl = 0;
1205         desc->l = 0;
1206         desc->d = SEG_OP_SIZE_32BIT;
1207         desc->g = SEG_GRANULARITY_4KB;
1208         desc->base2 = 0x00;
1209
1210         desc++;
1211         desc->limit0 = 0xffff;
1212         desc->base0 = 0x0000;
1213         desc->base1 = 0x0000;
1214         desc->type = SEG_TYPE_DATA | SEG_TYPE_READ_WRITE;
1215         desc->s = DESC_TYPE_CODE_DATA;
1216         desc->dpl = 0;
1217         desc->p = 1;
1218         desc->limit = 0xf;
1219         desc->avl = 0;
1220         desc->l = 0;
1221         desc->d = SEG_OP_SIZE_32BIT;
1222         desc->g = SEG_GRANULARITY_4KB;
1223         desc->base2 = 0x00;
1224
1225 #ifdef CONFIG_X86_64
1226         /* Task segment value */
1227         desc++;
1228         desc->limit0 = 0x0000;
1229         desc->base0 = 0x0000;
1230         desc->base1 = 0x0000;
1231         desc->type = SEG_TYPE_TSS;
1232         desc->s = 0;
1233         desc->dpl = 0;
1234         desc->p = 1;
1235         desc->limit = 0x0;
1236         desc->avl = 0;
1237         desc->l = 0;
1238         desc->d = 0;
1239         desc->g = SEG_GRANULARITY_4KB;
1240         desc->base2 = 0x00;
1241 #endif /* CONFIG_X86_64 */
1242
1243         asm volatile ("lidt %0" : : "m" (*idt));
1244         asm volatile ("lgdt %0" : : "m" (*gdt));
1245
1246         asm volatile("cli");
1247
1248         return boot_params;
1249 fail:
1250         return NULL;
1251 }