eboot.c 30.1 KB
Newer Older
Matt Fleming's avatar
Matt Fleming committed
1 2 3 4 5 6 7 8 9 10
/* -----------------------------------------------------------------------
 *
 *   Copyright 2011 Intel Corporation; author Matt Fleming
 *
 *   This file is part of the Linux kernel, and is made available under
 *   the terms of the GNU General Public License version 2.
 *
 * ----------------------------------------------------------------------- */

#include <linux/efi.h>
11
#include <linux/pci.h>
Matt Fleming's avatar
Matt Fleming committed
12 13 14 15
#include <asm/efi.h>
#include <asm/setup.h>
#include <asm/desc.h>

16 17
#undef memcpy			/* Use memcpy from misc.c */

Matt Fleming's avatar
Matt Fleming committed
18 19 20 21
#include "eboot.h"

static efi_system_table_t *sys_table;

22 23 24 25 26 27 28 29
static void efi_char16_printk(efi_char16_t *str)
{
	struct efi_simple_text_output_protocol *out;

	out = (struct efi_simple_text_output_protocol *)sys_table->con_out;
	efi_call_phys2(out->output_string, out, str);
}

30 31 32 33 34 35 36 37 38 39
static void efi_printk(char *str)
{
	char *s8;

	for (s8 = str; *s8; s8++) {
		efi_char16_t ch[2] = { 0 };

		ch[0] = *s8;
		if (*s8 == '\n') {
			efi_char16_t nl[2] = { '\r', 0 };
40
			efi_char16_printk(nl);
41 42
		}

43
		efi_char16_printk(ch);
44 45 46
	}
}

Matt Fleming's avatar
Matt Fleming committed
47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253
static efi_status_t __get_map(efi_memory_desc_t **map, unsigned long *map_size,
			      unsigned long *desc_size)
{
	efi_memory_desc_t *m = NULL;
	efi_status_t status;
	unsigned long key;
	u32 desc_version;

	*map_size = sizeof(*m) * 32;
again:
	/*
	 * Add an additional efi_memory_desc_t because we're doing an
	 * allocation which may be in a new descriptor region.
	 */
	*map_size += sizeof(*m);
	status = efi_call_phys3(sys_table->boottime->allocate_pool,
				EFI_LOADER_DATA, *map_size, (void **)&m);
	if (status != EFI_SUCCESS)
		goto fail;

	status = efi_call_phys5(sys_table->boottime->get_memory_map, map_size,
				m, &key, desc_size, &desc_version);
	if (status == EFI_BUFFER_TOO_SMALL) {
		efi_call_phys1(sys_table->boottime->free_pool, m);
		goto again;
	}

	if (status != EFI_SUCCESS)
		efi_call_phys1(sys_table->boottime->free_pool, m);

fail:
	*map = m;
	return status;
}

/*
 * Allocate at the highest possible address that is not above 'max'.
 */
static efi_status_t high_alloc(unsigned long size, unsigned long align,
			      unsigned long *addr, unsigned long max)
{
	unsigned long map_size, desc_size;
	efi_memory_desc_t *map;
	efi_status_t status;
	unsigned long nr_pages;
	u64 max_addr = 0;
	int i;

	status = __get_map(&map, &map_size, &desc_size);
	if (status != EFI_SUCCESS)
		goto fail;

	nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
again:
	for (i = 0; i < map_size / desc_size; i++) {
		efi_memory_desc_t *desc;
		unsigned long m = (unsigned long)map;
		u64 start, end;

		desc = (efi_memory_desc_t *)(m + (i * desc_size));
		if (desc->type != EFI_CONVENTIONAL_MEMORY)
			continue;

		if (desc->num_pages < nr_pages)
			continue;

		start = desc->phys_addr;
		end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT);

		if ((start + size) > end || (start + size) > max)
			continue;

		if (end - size > max)
			end = max;

		if (round_down(end - size, align) < start)
			continue;

		start = round_down(end - size, align);

		/*
		 * Don't allocate at 0x0. It will confuse code that
		 * checks pointers against NULL.
		 */
		if (start == 0x0)
			continue;

		if (start > max_addr)
			max_addr = start;
	}

	if (!max_addr)
		status = EFI_NOT_FOUND;
	else {
		status = efi_call_phys4(sys_table->boottime->allocate_pages,
					EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
					nr_pages, &max_addr);
		if (status != EFI_SUCCESS) {
			max = max_addr;
			max_addr = 0;
			goto again;
		}

		*addr = max_addr;
	}

free_pool:
	efi_call_phys1(sys_table->boottime->free_pool, map);

fail:
	return status;
}

/*
 * Allocate at the lowest possible address.
 */
static efi_status_t low_alloc(unsigned long size, unsigned long align,
			      unsigned long *addr)
{
	unsigned long map_size, desc_size;
	efi_memory_desc_t *map;
	efi_status_t status;
	unsigned long nr_pages;
	int i;

	status = __get_map(&map, &map_size, &desc_size);
	if (status != EFI_SUCCESS)
		goto fail;

	nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
	for (i = 0; i < map_size / desc_size; i++) {
		efi_memory_desc_t *desc;
		unsigned long m = (unsigned long)map;
		u64 start, end;

		desc = (efi_memory_desc_t *)(m + (i * desc_size));

		if (desc->type != EFI_CONVENTIONAL_MEMORY)
			continue;

		if (desc->num_pages < nr_pages)
			continue;

		start = desc->phys_addr;
		end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT);

		/*
		 * Don't allocate at 0x0. It will confuse code that
		 * checks pointers against NULL. Skip the first 8
		 * bytes so we start at a nice even number.
		 */
		if (start == 0x0)
			start += 8;

		start = round_up(start, align);
		if ((start + size) > end)
			continue;

		status = efi_call_phys4(sys_table->boottime->allocate_pages,
					EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
					nr_pages, &start);
		if (status == EFI_SUCCESS) {
			*addr = start;
			break;
		}
	}

	if (i == map_size / desc_size)
		status = EFI_NOT_FOUND;

free_pool:
	efi_call_phys1(sys_table->boottime->free_pool, map);
fail:
	return status;
}

static void low_free(unsigned long size, unsigned long addr)
{
	unsigned long nr_pages;

	nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
	efi_call_phys2(sys_table->boottime->free_pages, addr, size);
}

static void find_bits(unsigned long mask, u8 *pos, u8 *size)
{
	u8 first, len;

	first = 0;
	len = 0;

	if (mask) {
		while (!(mask & 0x1)) {
			mask = mask >> 1;
			first++;
		}

		while (mask & 0x1) {
			mask = mask >> 1;
			len++;
		}
	}

	*pos = first;
	*size = len;
}

254 255 256 257 258 259 260
static efi_status_t setup_efi_vars(struct boot_params *params)
{
	struct setup_data *data;
	struct efi_var_bootdata *efidata;
	u64 store_size, remaining_size, var_size;
	efi_status_t status;

261
	if (sys_table->runtime->hdr.revision < EFI_2_00_SYSTEM_TABLE_REVISION)
262 263 264 265 266 267 268
		return EFI_UNSUPPORTED;

	data = (struct setup_data *)(unsigned long)params->hdr.setup_data;

	while (data && data->next)
		data = (struct setup_data *)(unsigned long)data->next;

269
	status = efi_call_phys4((void *)sys_table->runtime->query_variable_info,
270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298
				EFI_VARIABLE_NON_VOLATILE |
				EFI_VARIABLE_BOOTSERVICE_ACCESS |
				EFI_VARIABLE_RUNTIME_ACCESS, &store_size,
				&remaining_size, &var_size);

	if (status != EFI_SUCCESS)
		return status;

	status = efi_call_phys3(sys_table->boottime->allocate_pool,
				EFI_LOADER_DATA, sizeof(*efidata), &efidata);

	if (status != EFI_SUCCESS)
		return status;

	efidata->data.type = SETUP_EFI_VARS;
	efidata->data.len = sizeof(struct efi_var_bootdata) -
		sizeof(struct setup_data);
	efidata->data.next = 0;
	efidata->store_size = store_size;
	efidata->remaining_size = remaining_size;
	efidata->max_var_size = var_size;

	if (data)
		data->next = (unsigned long)efidata;
	else
		params->hdr.setup_data = (unsigned long)efidata;

}

299 300 301 302 303 304 305 306 307 308
static efi_status_t setup_efi_pci(struct boot_params *params)
{
	efi_pci_io_protocol *pci;
	efi_status_t status;
	void **pci_handle;
	efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
	unsigned long nr_pci, size = 0;
	int i;
	struct setup_data *data;

309
	data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
310 311

	while (data && data->next)
312
		data = (struct setup_data *)(unsigned long)data->next;
313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347

	status = efi_call_phys5(sys_table->boottime->locate_handle,
				EFI_LOCATE_BY_PROTOCOL, &pci_proto,
				NULL, &size, pci_handle);

	if (status == EFI_BUFFER_TOO_SMALL) {
		status = efi_call_phys3(sys_table->boottime->allocate_pool,
					EFI_LOADER_DATA, size, &pci_handle);

		if (status != EFI_SUCCESS)
			return status;

		status = efi_call_phys5(sys_table->boottime->locate_handle,
					EFI_LOCATE_BY_PROTOCOL, &pci_proto,
					NULL, &size, pci_handle);
	}

	if (status != EFI_SUCCESS)
		goto free_handle;

	nr_pci = size / sizeof(void *);
	for (i = 0; i < nr_pci; i++) {
		void *h = pci_handle[i];
		uint64_t attributes;
		struct pci_setup_rom *rom;

		status = efi_call_phys3(sys_table->boottime->handle_protocol,
					h, &pci_proto, &pci);

		if (status != EFI_SUCCESS)
			continue;

		if (!pci)
			continue;

348
#ifdef CONFIG_X86_64
349 350 351
		status = efi_call_phys4(pci->attributes, pci,
					EfiPciIoAttributeOperationGet, 0,
					&attributes);
352 353 354 355 356
#else
		status = efi_call_phys5(pci->attributes, pci,
					EfiPciIoAttributeOperationGet, 0, 0,
					&attributes);
#endif
357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399
		if (status != EFI_SUCCESS)
			continue;

		if (!pci->romimage || !pci->romsize)
			continue;

		size = pci->romsize + sizeof(*rom);

		status = efi_call_phys3(sys_table->boottime->allocate_pool,
				EFI_LOADER_DATA, size, &rom);

		if (status != EFI_SUCCESS)
			continue;

		rom->data.type = SETUP_PCI;
		rom->data.len = size - sizeof(struct setup_data);
		rom->data.next = 0;
		rom->pcilen = pci->romsize;

		status = efi_call_phys5(pci->pci.read, pci,
					EfiPciIoWidthUint16, PCI_VENDOR_ID,
					1, &(rom->vendor));

		if (status != EFI_SUCCESS)
			goto free_struct;

		status = efi_call_phys5(pci->pci.read, pci,
					EfiPciIoWidthUint16, PCI_DEVICE_ID,
					1, &(rom->devid));

		if (status != EFI_SUCCESS)
			goto free_struct;

		status = efi_call_phys5(pci->get_location, pci,
					&(rom->segment), &(rom->bus),
					&(rom->device), &(rom->function));

		if (status != EFI_SUCCESS)
			goto free_struct;

		memcpy(rom->romdata, pci->romimage, pci->romsize);

		if (data)
400
			data->next = (unsigned long)rom;
401
		else
402
			params->hdr.setup_data = (unsigned long)rom;
403 404 405 406 407 408 409 410 411 412 413 414 415

		data = (struct setup_data *)rom;

		continue;
	free_struct:
		efi_call_phys1(sys_table->boottime->free_pool, rom);
	}

free_handle:
	efi_call_phys1(sys_table->boottime->free_pool, pci_handle);
	return status;
}

Matt Fleming's avatar
Matt Fleming committed
416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448
/*
 * See if we have Graphics Output Protocol
 */
static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto,
			      unsigned long size)
{
	struct efi_graphics_output_protocol *gop, *first_gop;
	struct efi_pixel_bitmask pixel_info;
	unsigned long nr_gops;
	efi_status_t status;
	void **gop_handle;
	u16 width, height;
	u32 fb_base, fb_size;
	u32 pixels_per_scan_line;
	int pixel_format;
	int i;

	status = efi_call_phys3(sys_table->boottime->allocate_pool,
				EFI_LOADER_DATA, size, &gop_handle);
	if (status != EFI_SUCCESS)
		return status;

	status = efi_call_phys5(sys_table->boottime->locate_handle,
				EFI_LOCATE_BY_PROTOCOL, proto,
				NULL, &size, gop_handle);
	if (status != EFI_SUCCESS)
		goto free_handle;

	first_gop = NULL;

	nr_gops = size / sizeof(void *);
	for (i = 0; i < nr_gops; i++) {
		struct efi_graphics_output_mode_info *info;
449 450 451
		efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
		bool conout_found = false;
		void *dummy;
Matt Fleming's avatar
Matt Fleming committed
452 453 454 455 456 457 458
		void *h = gop_handle[i];

		status = efi_call_phys3(sys_table->boottime->handle_protocol,
					h, proto, &gop);
		if (status != EFI_SUCCESS)
			continue;

459 460 461 462 463
		status = efi_call_phys3(sys_table->boottime->handle_protocol,
					h, &conout_proto, &dummy);

		if (status == EFI_SUCCESS)
			conout_found = true;
Matt Fleming's avatar
Matt Fleming committed
464 465 466

		status = efi_call_phys4(gop->query_mode, gop,
					gop->mode->mode, &size, &info);
467
		if (status == EFI_SUCCESS && (!first_gop || conout_found)) {
Matt Fleming's avatar
Matt Fleming committed
468
			/*
469 470 471 472 473
			 * Systems that use the UEFI Console Splitter may
			 * provide multiple GOP devices, not all of which are
			 * backed by real hardware. The workaround is to search
			 * for a GOP implementing the ConOut protocol, and if
			 * one isn't found, to just fall back to the first GOP.
Matt Fleming's avatar
Matt Fleming committed
474 475 476 477 478 479 480 481 482 483
			 */
			width = info->horizontal_resolution;
			height = info->vertical_resolution;
			fb_base = gop->mode->frame_buffer_base;
			fb_size = gop->mode->frame_buffer_size;
			pixel_format = info->pixel_format;
			pixel_info = info->pixel_information;
			pixels_per_scan_line = info->pixels_per_scan_line;

			/*
484
			 * Once we've found a GOP supporting ConOut,
Matt Fleming's avatar
Matt Fleming committed
485 486
			 * don't bother looking any further.
			 */
487
			first_gop = gop;
488
			if (conout_found)
Matt Fleming's avatar
Matt Fleming committed
489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549
				break;
		}
	}

	/* Did we find any GOPs? */
	if (!first_gop)
		goto free_handle;

	/* EFI framebuffer */
	si->orig_video_isVGA = VIDEO_TYPE_EFI;

	si->lfb_width = width;
	si->lfb_height = height;
	si->lfb_base = fb_base;
	si->pages = 1;

	if (pixel_format == PIXEL_RGB_RESERVED_8BIT_PER_COLOR) {
		si->lfb_depth = 32;
		si->lfb_linelength = pixels_per_scan_line * 4;
		si->red_size = 8;
		si->red_pos = 0;
		si->green_size = 8;
		si->green_pos = 8;
		si->blue_size = 8;
		si->blue_pos = 16;
		si->rsvd_size = 8;
		si->rsvd_pos = 24;
	} else if (pixel_format == PIXEL_BGR_RESERVED_8BIT_PER_COLOR) {
		si->lfb_depth = 32;
		si->lfb_linelength = pixels_per_scan_line * 4;
		si->red_size = 8;
		si->red_pos = 16;
		si->green_size = 8;
		si->green_pos = 8;
		si->blue_size = 8;
		si->blue_pos = 0;
		si->rsvd_size = 8;
		si->rsvd_pos = 24;
	} else if (pixel_format == PIXEL_BIT_MASK) {
		find_bits(pixel_info.red_mask, &si->red_pos, &si->red_size);
		find_bits(pixel_info.green_mask, &si->green_pos,
			  &si->green_size);
		find_bits(pixel_info.blue_mask, &si->blue_pos, &si->blue_size);
		find_bits(pixel_info.reserved_mask, &si->rsvd_pos,
			  &si->rsvd_size);
		si->lfb_depth = si->red_size + si->green_size +
			si->blue_size + si->rsvd_size;
		si->lfb_linelength = (pixels_per_scan_line * si->lfb_depth) / 8;
	} else {
		si->lfb_depth = 4;
		si->lfb_linelength = si->lfb_width / 2;
		si->red_size = 0;
		si->red_pos = 0;
		si->green_size = 0;
		si->green_pos = 0;
		si->blue_size = 0;
		si->blue_pos = 0;
		si->rsvd_size = 0;
		si->rsvd_pos = 0;
	}

550 551
	si->lfb_size = si->lfb_linelength * si->lfb_height;

552 553
	si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;

Matt Fleming's avatar
Matt Fleming committed
554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728
free_handle:
	efi_call_phys1(sys_table->boottime->free_pool, gop_handle);
	return status;
}

/*
 * See if we have Universal Graphics Adapter (UGA) protocol
 */
static efi_status_t setup_uga(struct screen_info *si, efi_guid_t *uga_proto,
			      unsigned long size)
{
	struct efi_uga_draw_protocol *uga, *first_uga;
	unsigned long nr_ugas;
	efi_status_t status;
	u32 width, height;
	void **uga_handle = NULL;
	int i;

	status = efi_call_phys3(sys_table->boottime->allocate_pool,
				EFI_LOADER_DATA, size, &uga_handle);
	if (status != EFI_SUCCESS)
		return status;

	status = efi_call_phys5(sys_table->boottime->locate_handle,
				EFI_LOCATE_BY_PROTOCOL, uga_proto,
				NULL, &size, uga_handle);
	if (status != EFI_SUCCESS)
		goto free_handle;

	first_uga = NULL;

	nr_ugas = size / sizeof(void *);
	for (i = 0; i < nr_ugas; i++) {
		efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
		void *handle = uga_handle[i];
		u32 w, h, depth, refresh;
		void *pciio;

		status = efi_call_phys3(sys_table->boottime->handle_protocol,
					handle, uga_proto, &uga);
		if (status != EFI_SUCCESS)
			continue;

		efi_call_phys3(sys_table->boottime->handle_protocol,
			       handle, &pciio_proto, &pciio);

		status = efi_call_phys5(uga->get_mode, uga, &w, &h,
					&depth, &refresh);
		if (status == EFI_SUCCESS && (!first_uga || pciio)) {
			width = w;
			height = h;

			/*
			 * Once we've found a UGA supporting PCIIO,
			 * don't bother looking any further.
			 */
			if (pciio)
				break;

			first_uga = uga;
		}
	}

	if (!first_uga)
		goto free_handle;

	/* EFI framebuffer */
	si->orig_video_isVGA = VIDEO_TYPE_EFI;

	si->lfb_depth = 32;
	si->lfb_width = width;
	si->lfb_height = height;

	si->red_size = 8;
	si->red_pos = 16;
	si->green_size = 8;
	si->green_pos = 8;
	si->blue_size = 8;
	si->blue_pos = 0;
	si->rsvd_size = 8;
	si->rsvd_pos = 24;


free_handle:
	efi_call_phys1(sys_table->boottime->free_pool, uga_handle);
	return status;
}

void setup_graphics(struct boot_params *boot_params)
{
	efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
	struct screen_info *si;
	efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
	efi_status_t status;
	unsigned long size;
	void **gop_handle = NULL;
	void **uga_handle = NULL;

	si = &boot_params->screen_info;
	memset(si, 0, sizeof(*si));

	size = 0;
	status = efi_call_phys5(sys_table->boottime->locate_handle,
				EFI_LOCATE_BY_PROTOCOL, &graphics_proto,
				NULL, &size, gop_handle);
	if (status == EFI_BUFFER_TOO_SMALL)
		status = setup_gop(si, &graphics_proto, size);

	if (status != EFI_SUCCESS) {
		size = 0;
		status = efi_call_phys5(sys_table->boottime->locate_handle,
					EFI_LOCATE_BY_PROTOCOL, &uga_proto,
					NULL, &size, uga_handle);
		if (status == EFI_BUFFER_TOO_SMALL)
			setup_uga(si, &uga_proto, size);
	}
}

struct initrd {
	efi_file_handle_t *handle;
	u64 size;
};

/*
 * Check the cmdline for a LILO-style initrd= arguments.
 *
 * We only support loading an initrd from the same filesystem as the
 * kernel image.
 */
static efi_status_t handle_ramdisks(efi_loaded_image_t *image,
				    struct setup_header *hdr)
{
	struct initrd *initrds;
	unsigned long initrd_addr;
	efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
	u64 initrd_total;
	efi_file_io_interface_t *io;
	efi_file_handle_t *fh;
	efi_status_t status;
	int nr_initrds;
	char *str;
	int i, j, k;

	initrd_addr = 0;
	initrd_total = 0;

	str = (char *)(unsigned long)hdr->cmd_line_ptr;

	j = 0;			/* See close_handles */

	if (!str || !*str)
		return EFI_SUCCESS;

	for (nr_initrds = 0; *str; nr_initrds++) {
		str = strstr(str, "initrd=");
		if (!str)
			break;

		str += 7;

		/* Skip any leading slashes */
		while (*str == '/' || *str == '\\')
			str++;

		while (*str && *str != ' ' && *str != '\n')
			str++;
	}

	if (!nr_initrds)
		return EFI_SUCCESS;

	status = efi_call_phys3(sys_table->boottime->allocate_pool,
				EFI_LOADER_DATA,
				nr_initrds * sizeof(*initrds),
				&initrds);
729 730
	if (status != EFI_SUCCESS) {
		efi_printk("Failed to alloc mem for initrds\n");
Matt Fleming's avatar
Matt Fleming committed
731
		goto fail;
732
	}
Matt Fleming's avatar
Matt Fleming committed
733 734 735 736 737 738

	str = (char *)(unsigned long)hdr->cmd_line_ptr;
	for (i = 0; i < nr_initrds; i++) {
		struct initrd *initrd;
		efi_file_handle_t *h;
		efi_file_info_t *info;
739
		efi_char16_t filename_16[256];
Matt Fleming's avatar
Matt Fleming committed
740 741 742 743 744 745 746 747 748 749 750 751
		unsigned long info_sz;
		efi_guid_t info_guid = EFI_FILE_INFO_ID;
		efi_char16_t *p;
		u64 file_sz;

		str = strstr(str, "initrd=");
		if (!str)
			break;

		str += 7;

		initrd = &initrds[i];
752
		p = filename_16;
Matt Fleming's avatar
Matt Fleming committed
753 754 755 756 757 758

		/* Skip any leading slashes */
		while (*str == '/' || *str == '\\')
			str++;

		while (*str && *str != ' ' && *str != '\n') {
759
			if ((u8 *)p >= (u8 *)filename_16 + sizeof(filename_16))
Matt Fleming's avatar
Matt Fleming committed
760 761
				break;

762 763 764 765 766 767
			if (*str == '/') {
				*p++ = '\\';
				*str++;
			} else {
				*p++ = *str++;
			}
Matt Fleming's avatar
Matt Fleming committed
768 769 770 771 772 773 774 775 776 777 778 779
		}

		*p = '\0';

		/* Only open the volume once. */
		if (!i) {
			efi_boot_services_t *boottime;

			boottime = sys_table->boottime;

			status = efi_call_phys3(boottime->handle_protocol,
					image->device_handle, &fs_proto, &io);
780 781
			if (status != EFI_SUCCESS) {
				efi_printk("Failed to handle fs_proto\n");
Matt Fleming's avatar
Matt Fleming committed
782
				goto free_initrds;
783
			}
Matt Fleming's avatar
Matt Fleming committed
784 785

			status = efi_call_phys2(io->open_volume, io, &fh);
786 787
			if (status != EFI_SUCCESS) {
				efi_printk("Failed to open volume\n");
Matt Fleming's avatar
Matt Fleming committed
788
				goto free_initrds;
789
			}
Matt Fleming's avatar
Matt Fleming committed
790 791
		}

792
		status = efi_call_phys5(fh->open, fh, &h, filename_16,
Matt Fleming's avatar
Matt Fleming committed
793
					EFI_FILE_MODE_READ, (u64)0);
794
		if (status != EFI_SUCCESS) {
795 796 797
			efi_printk("Failed to open initrd file: ");
			efi_char16_printk(filename_16);
			efi_printk("\n");
Matt Fleming's avatar
Matt Fleming committed
798
			goto close_handles;
799
		}
Matt Fleming's avatar
Matt Fleming committed
800 801 802 803 804 805

		initrd->handle = h;

		info_sz = 0;
		status = efi_call_phys4(h->get_info, h, &info_guid,
					&info_sz, NULL);
806 807
		if (status != EFI_BUFFER_TOO_SMALL) {
			efi_printk("Failed to get initrd info size\n");
Matt Fleming's avatar
Matt Fleming committed
808
			goto close_handles;
809
		}
Matt Fleming's avatar
Matt Fleming committed
810 811 812 813

grow:
		status = efi_call_phys3(sys_table->boottime->allocate_pool,
					EFI_LOADER_DATA, info_sz, &info);
814 815
		if (status != EFI_SUCCESS) {
			efi_printk("Failed to alloc mem for initrd info\n");
Matt Fleming's avatar
Matt Fleming committed
816
			goto close_handles;
817
		}
Matt Fleming's avatar
Matt Fleming committed
818 819 820 821 822 823 824 825 826 827 828

		status = efi_call_phys4(h->get_info, h, &info_guid,
					&info_sz, info);
		if (status == EFI_BUFFER_TOO_SMALL) {
			efi_call_phys1(sys_table->boottime->free_pool, info);
			goto grow;
		}

		file_sz = info->file_size;
		efi_call_phys1(sys_table->boottime->free_pool, info);

829 830
		if (status != EFI_SUCCESS) {
			efi_printk("Failed to get initrd info\n");
Matt Fleming's avatar
Matt Fleming committed
831
			goto close_handles;
832
		}
Matt Fleming's avatar
Matt Fleming committed
833 834 835 836 837 838 839 840 841 842 843 844 845 846 847

		initrd->size = file_sz;
		initrd_total += file_sz;
	}

	if (initrd_total) {
		unsigned long addr;

		/*
		 * Multiple initrd's need to be at consecutive
		 * addresses in memory, so allocate enough memory for
		 * all the initrd's.
		 */
		status = high_alloc(initrd_total, 0x1000,
				   &initrd_addr, hdr->initrd_addr_max);
848 849
		if (status != EFI_SUCCESS) {
			efi_printk("Failed to alloc highmem for initrds\n");
Matt Fleming's avatar
Matt Fleming committed
850
			goto close_handles;
851
		}
Matt Fleming's avatar
Matt Fleming committed
852 853 854

		/* We've run out of free low memory. */
		if (initrd_addr > hdr->initrd_addr_max) {
855
			efi_printk("We've run out of free low memory\n");
Matt Fleming's avatar
Matt Fleming committed
856 857 858 859 860 861 862 863 864
			status = EFI_INVALID_PARAMETER;
			goto free_initrd_total;
		}

		addr = initrd_addr;
		for (j = 0; j < nr_initrds; j++) {
			u64 size;

			size = initrds[j].size;
865 866 867 868 869 870 871 872 873
			while (size) {
				u64 chunksize;
				if (size > EFI_READ_CHUNK_SIZE)
					chunksize = EFI_READ_CHUNK_SIZE;
				else
					chunksize = size;
				status = efi_call_phys3(fh->read,
							initrds[j].handle,
							&chunksize, addr);
874 875
				if (status != EFI_SUCCESS) {
					efi_printk("Failed to read initrd\n");
876
					goto free_initrd_total;
877
				}
878 879 880
				addr += chunksize;
				size -= chunksize;
			}
Matt Fleming's avatar
Matt Fleming committed
881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897

			efi_call_phys1(fh->close, initrds[j].handle);
		}

	}

	efi_call_phys1(sys_table->boottime->free_pool, initrds);

	hdr->ramdisk_image = initrd_addr;
	hdr->ramdisk_size = initrd_total;

	return status;

free_initrd_total:
	low_free(initrd_total, initrd_addr);

close_handles:
898
	for (k = j; k < i; k++)
Matt Fleming's avatar
Matt Fleming committed
899 900 901 902 903 904 905 906 907 908 909 910 911 912 913
		efi_call_phys1(fh->close, initrds[k].handle);
free_initrds:
	efi_call_phys1(sys_table->boottime->free_pool, initrds);
fail:
	hdr->ramdisk_image = 0;
	hdr->ramdisk_size = 0;

	return status;
}

/*
 * Because the x86 boot code expects to be passed a boot_params we
 * need to create one ourselves (usually the bootloader would create
 * one for us).
 */
Matt Fleming's avatar
Matt Fleming committed
914
struct boot_params *make_boot_params(void *handle, efi_system_table_t *_table)
Matt Fleming's avatar
Matt Fleming committed
915
{
Matt Fleming's avatar
Matt Fleming committed
916 917 918 919 920 921 922 923 924
	struct boot_params *boot_params;
	struct sys_desc_table *sdt;
	struct apm_bios_info *bi;
	struct setup_header *hdr;
	struct efi_info *efi;
	efi_loaded_image_t *image;
	void *options;
	u32 load_options_size;
	efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
Matt Fleming's avatar
Matt Fleming committed
925 926 927 928 929 930 931
	int options_size = 0;
	efi_status_t status;
	unsigned long cmdline;
	u16 *s2;
	u8 *s1;
	int i;

Matt Fleming's avatar
Matt Fleming committed
932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970
	sys_table = _table;

	/* Check if we were booted by the EFI firmware */
	if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
		return NULL;

	status = efi_call_phys3(sys_table->boottime->handle_protocol,
				handle, &proto, (void *)&image);
	if (status != EFI_SUCCESS) {
		efi_printk("Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
		return NULL;
	}

	status = low_alloc(0x4000, 1, (unsigned long *)&boot_params);
	if (status != EFI_SUCCESS) {
		efi_printk("Failed to alloc lowmem for boot params\n");
		return NULL;
	}

	memset(boot_params, 0x0, 0x4000);

	hdr = &boot_params->hdr;
	efi = &boot_params->efi_info;
	bi = &boot_params->apm_bios_info;
	sdt = &boot_params->sys_desc_table;

	/* Copy the second sector to boot_params */
	memcpy(&hdr->jump, image->image_base + 512, 512);

	/*
	 * Fill out some of the header fields ourselves because the
	 * EFI firmware loader doesn't load the first sector.
	 */
	hdr->root_flags = 1;
	hdr->vid_mode = 0xffff;
	hdr->boot_flag = 0xAA55;

	hdr->code32_start = (__u64)(unsigned long)image->image_base;

Matt Fleming's avatar
Matt Fleming committed
971 972 973
	hdr->type_of_loader = 0x21;

	/* Convert unicode cmdline to ascii */
Matt Fleming's avatar
Matt Fleming committed
974 975
	options = image->load_options;
	load_options_size = image->load_options_size / 2; /* ASCII */
Matt Fleming's avatar
Matt Fleming committed
976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991
	cmdline = 0;
	s2 = (u16 *)options;

	if (s2) {
		while (*s2 && *s2 != '\n' && options_size < load_options_size) {
			s2++;
			options_size++;
		}

		if (options_size) {
			if (options_size > hdr->cmdline_size)
				options_size = hdr->cmdline_size;

			options_size++;	/* NUL termination */

			status = low_alloc(options_size, 1, &cmdline);
992 993
			if (status != EFI_SUCCESS) {
				efi_printk("Failed to alloc mem for cmdline\n");
Matt Fleming's avatar
Matt Fleming committed
994
				goto fail;
995
			}
Matt Fleming's avatar
Matt Fleming committed
996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016

			s1 = (u8 *)(unsigned long)cmdline;
			s2 = (u16 *)options;

			for (i = 0; i < options_size - 1; i++)
				*s1++ = *s2++;

			*s1 = '\0';
		}
	}

	hdr->cmd_line_ptr = cmdline;

	hdr->ramdisk_image = 0;
	hdr->ramdisk_size = 0;

	/* Clear APM BIOS info */
	memset(bi, 0, sizeof(*bi));

	memset(sdt, 0, sizeof(*sdt));

Matt Fleming's avatar
Matt Fleming committed
1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041
	status = handle_ramdisks(image, hdr);
	if (status != EFI_SUCCESS)
		goto fail2;

	return boot_params;
fail2:
	if (options_size)
		low_free(options_size, hdr->cmd_line_ptr);
fail:
	low_free(0x4000, (unsigned long)boot_params);
	return NULL;
}

static efi_status_t exit_boot(struct boot_params *boot_params,
			      void *handle)
{
	struct efi_info *efi = &boot_params->efi_info;
	struct e820entry *e820_map = &boot_params->e820_map[0];
	struct e820entry *prev = NULL;
	unsigned long size, key, desc_size, _size;
	efi_memory_desc_t *mem_map;
	efi_status_t status;
	__u32 desc_version;
	u8 nr_entries;
	int i;
Matt Fleming's avatar
Matt Fleming committed
1042 1043 1044 1045 1046 1047 1048 1049

	size = sizeof(*mem_map) * 32;

again:
	size += sizeof(*mem_map);
	_size = size;
	status = low_alloc(size, 1, (unsigned long *)&mem_map);
	if (status != EFI_SUCCESS)
Matt Fleming's avatar
Matt Fleming committed
1050
		return status;
Matt Fleming's avatar
Matt Fleming committed
1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061

	status = efi_call_phys5(sys_table->boottime->get_memory_map, &size,
				mem_map, &key, &desc_size, &desc_version);
	if (status == EFI_BUFFER_TOO_SMALL) {
		low_free(_size, (unsigned long)mem_map);
		goto again;
	}

	if (status != EFI_SUCCESS)
		goto free_mem_map;

Matt Fleming's avatar
Matt Fleming committed
1062
	memcpy(&efi->efi_loader_signature, EFI_LOADER_SIGNATURE, sizeof(__u32));
Matt Fleming's avatar
Matt Fleming committed
1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148
	efi->efi_systab = (unsigned long)sys_table;
	efi->efi_memdesc_size = desc_size;
	efi->efi_memdesc_version = desc_version;
	efi->efi_memmap = (unsigned long)mem_map;
	efi->efi_memmap_size = size;

#ifdef CONFIG_X86_64
	efi->efi_systab_hi = (unsigned long)sys_table >> 32;
	efi->efi_memmap_hi = (unsigned long)mem_map >> 32;
#endif

	/* Might as well exit boot services now */
	status = efi_call_phys2(sys_table->boottime->exit_boot_services,
				handle, key);
	if (status != EFI_SUCCESS)
		goto free_mem_map;

	/* Historic? */
	boot_params->alt_mem_k = 32 * 1024;

	/*
	 * Convert the EFI memory map to E820.
	 */
	nr_entries = 0;
	for (i = 0; i < size / desc_size; i++) {
		efi_memory_desc_t *d;
		unsigned int e820_type = 0;
		unsigned long m = (unsigned long)mem_map;

		d = (efi_memory_desc_t *)(m + (i * desc_size));
		switch (d->type) {
		case EFI_RESERVED_TYPE:
		case EFI_RUNTIME_SERVICES_CODE:
		case EFI_RUNTIME_SERVICES_DATA:
		case EFI_MEMORY_MAPPED_IO:
		case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
		case EFI_PAL_CODE:
			e820_type = E820_RESERVED;
			break;

		case EFI_UNUSABLE_MEMORY:
			e820_type = E820_UNUSABLE;
			break;

		case EFI_ACPI_RECLAIM_MEMORY:
			e820_type = E820_ACPI;
			break;

		case EFI_LOADER_CODE:
		case EFI_LOADER_DATA:
		case EFI_BOOT_SERVICES_CODE:
		case EFI_BOOT_SERVICES_DATA:
		case EFI_CONVENTIONAL_MEMORY:
			e820_type = E820_RAM;
			break;

		case EFI_ACPI_MEMORY_NVS:
			e820_type = E820_NVS;
			break;

		default:
			continue;
		}

		/* Merge adjacent mappings */
		if (prev && prev->type == e820_type &&
		    (prev->addr + prev->size) == d->phys_addr)
			prev->size += d->num_pages << 12;
		else {
			e820_map->addr = d->phys_addr;
			e820_map->size = d->num_pages << 12;
			e820_map->type = e820_type;
			prev = e820_map++;
			nr_entries++;
		}
	}

	boot_params->e820_entries = nr_entries;

	return EFI_SUCCESS;

free_mem_map:
	low_free(_size, (unsigned long)mem_map);
	return status;
}

Matt Fleming's avatar
Matt Fleming committed
1149
static efi_status_t relocate_kernel(struct setup_header *hdr)
Matt Fleming's avatar
Matt Fleming committed
1150 1151 1152
{
	unsigned long start, nr_pages;
	efi_status_t status;
1153

Matt Fleming's avatar
Matt Fleming committed
1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169
	/*
	 * The EFI firmware loader could have placed the kernel image
	 * anywhere in memory, but the kernel has various restrictions
	 * on the max physical address it can run at. Attempt to move
	 * the kernel to boot_params.pref_address, or as low as
	 * possible.
	 */
	start = hdr->pref_address;
	nr_pages = round_up(hdr->init_size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;

	status = efi_call_phys4(sys_table->boottime->allocate_pages,
				EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
				nr_pages, &start);
	if (status != EFI_SUCCESS) {
		status = low_alloc(hdr->init_size, hdr->kernel_alignment,
				   &start);
Matt Fleming's avatar
Matt Fleming committed
1170
		if (status != EFI_SUCCESS)
1171
			efi_printk("Failed to alloc mem for kernel\n");
Matt Fleming's avatar
Matt Fleming committed
1172 1173
	}

Matt Fleming's avatar
Matt Fleming committed
1174 1175 1176 1177 1178
	if (status == EFI_SUCCESS)
		memcpy((void *)start, (void *)(unsigned long)hdr->code32_start,
		       hdr->init_size);

	hdr->pref_address = hdr->code32_start;
Matt Fleming's avatar
Matt Fleming committed
1179 1180
	hdr->code32_start = (__u32)start;

Matt Fleming's avatar
Matt Fleming committed
1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203
	return status;
}

/*
 * On success we return a pointer to a boot_params structure, and NULL
 * on failure.
 */
struct boot_params *efi_main(void *handle, efi_system_table_t *_table,
			     struct boot_params *boot_params)
{
	struct desc_ptr *gdt, *idt;
	efi_loaded_image_t *image;
	struct setup_header *hdr = &boot_params->hdr;
	efi_status_t status;
	struct desc_struct *desc;

	sys_table = _table;

	/* Check if we were booted by the EFI firmware */
	if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
		goto fail;

	setup_graphics(boot_params);
Matt Fleming's avatar
Matt Fleming committed
1204

1205 1206
	setup_efi_vars(boot_params);

1207 1208
	setup_efi_pci(boot_params);

Matt Fleming's avatar
Matt Fleming committed
1209 1210 1211
	status = efi_call_phys3(sys_table->boottime->allocate_pool,
				EFI_LOADER_DATA, sizeof(*gdt),
				(void **)&gdt);
1212 1213
	if (status != EFI_SUCCESS) {
		efi_printk("Failed to alloc mem for gdt structure\n");
Matt Fleming's avatar
Matt Fleming committed
1214
		goto fail;
1215
	}
Matt Fleming's avatar
Matt Fleming committed
1216 1217 1218

	gdt->size = 0x800;
	status = low_alloc(gdt->size, 8, (unsigned long *)&gdt->address);
1219 1220
	if (status != EFI_SUCCESS) {
		efi_printk("Failed to alloc mem for gdt\n");
Matt Fleming's avatar
Matt Fleming committed
1221
		goto fail;
1222
	}
Matt Fleming's avatar
Matt Fleming committed
1223 1224 1225 1226

	status = efi_call_phys3(sys_table->boottime->allocate_pool,
				EFI_LOADER_DATA, sizeof(*idt),
				(void **)&idt);
1227 1228
	if (status != EFI_SUCCESS) {
		efi_printk("Failed to alloc mem for idt structure\n");
Matt Fleming's avatar
Matt Fleming committed
1229
		goto fail;
1230
	}
Matt Fleming's avatar
Matt Fleming committed
1231 1232 1233 1234

	idt->size = 0;
	idt->address = 0;

Matt Fleming's avatar
Matt Fleming committed
1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246
	/*
	 * If the kernel isn't already loaded at the preferred load
	 * address, relocate it.
	 */
	if (hdr->pref_address != hdr->code32_start) {
		status = relocate_kernel(hdr);

		if (status != EFI_SUCCESS)
			goto fail;
	}

	status = exit_boot(boot_params, handle);
Matt Fleming's avatar
Matt Fleming committed
1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311
	if (status != EFI_SUCCESS)
		goto fail;

	memset((char *)gdt->address, 0x0, gdt->size);
	desc = (struct desc_struct *)gdt->address;

	/* The first GDT is a dummy and the second is unused. */
	desc += 2;

	desc->limit0 = 0xffff;
	desc->base0 = 0x0000;
	desc->base1 = 0x0000;
	desc->type = SEG_TYPE_CODE | SEG_TYPE_EXEC_READ;
	desc->s = DESC_TYPE_CODE_DATA;
	desc->dpl = 0;
	desc->p = 1;
	desc->limit = 0xf;
	desc->avl = 0;
	desc->l = 0;
	desc->d = SEG_OP_SIZE_32BIT;
	desc->g = SEG_GRANULARITY_4KB;
	desc->base2 = 0x00;

	desc++;
	desc->limit0 = 0xffff;
	desc->base0 = 0x0000;
	desc->base1 = 0x0000;
	desc->type = SEG_TYPE_DATA | SEG_TYPE_READ_WRITE;
	desc->s = DESC_TYPE_CODE_DATA;
	desc->dpl = 0;
	desc->p = 1;
	desc->limit = 0xf;
	desc->avl = 0;
	desc->l = 0;
	desc->d = SEG_OP_SIZE_32BIT;
	desc->g = SEG_GRANULARITY_4KB;
	desc->base2 = 0x00;

#ifdef CONFIG_X86_64
	/* Task segment value */
	desc++;
	desc->limit0 = 0x0000;
	desc->base0 = 0x0000;
	desc->base1 = 0x0000;
	desc->type = SEG_TYPE_TSS;
	desc->s = 0;
	desc->dpl = 0;
	desc->p = 1;
	desc->limit = 0x0;
	desc->avl = 0;
	desc->l = 0;
	desc->d = 0;
	desc->g = SEG_GRANULARITY_4KB;
	desc->base2 = 0x00;
#endif /* CONFIG_X86_64 */

	asm volatile ("lidt %0" : : "m" (*idt));
	asm volatile ("lgdt %0" : : "m" (*gdt));

	asm volatile("cli");

	return boot_params;
fail:
	return NULL;
}