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eboot.c 22.8 KB
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// SPDX-License-Identifier: GPL-2.0-only
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/* -----------------------------------------------------------------------
 *
 *   Copyright 2011 Intel Corporation; author Matt Fleming
 *
 * ----------------------------------------------------------------------- */

#include <linux/efi.h>
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#include <linux/pci.h>
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12
#include <asm/efi.h>
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#include <asm/e820/types.h>
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#include <asm/setup.h>
#include <asm/desc.h>
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#include <asm/boot.h>
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18
#include "../string.h"
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#include "eboot.h"

static efi_system_table_t *sys_table;

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static struct efi_config *efi_early;

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__pure const struct efi_config *__efi_early(void)
{
	return efi_early;
}
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#define BOOT_SERVICES(bits)						\
static void setup_boot_services##bits(struct efi_config *c)		\
{									\
	efi_system_table_##bits##_t *table;				\
									\
	table = (typeof(table))sys_table;				\
									\
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	c->runtime_services	= table->runtime;			\
	c->boot_services	= table->boottime;			\
	c->text_output		= table->con_out;			\
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}
BOOT_SERVICES(32);
BOOT_SERVICES(64);
43

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void efi_char16_printk(efi_system_table_t *table, efi_char16_t *str)
45
{
46 47
	efi_call_proto(efi_simple_text_output_protocol, output_string,
		       efi_early->text_output, str);
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}

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static efi_status_t
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preserve_pci_rom_image(efi_pci_io_protocol_t *pci, struct pci_setup_rom **__rom)
52
{
53
	struct pci_setup_rom *rom = NULL;
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	efi_status_t status;
55
	unsigned long size;
56
	uint64_t romsize;
57
	void *romimage;
58

59
	/*
60 61
	 * Some firmware images contain EFI function pointers at the place where
	 * the romimage and romsize fields are supposed to be. Typically the EFI
62 63 64 65
	 * code is mapped at high addresses, translating to an unrealistically
	 * large romsize. The UEFI spec limits the size of option ROMs to 16
	 * MiB so we reject any ROMs over 16 MiB in size to catch this.
	 */
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	romimage = (void *)(unsigned long)efi_table_attr(efi_pci_io_protocol,
							 romimage, pci);
	romsize = efi_table_attr(efi_pci_io_protocol, romsize, pci);
69
	if (!romimage || !romsize || romsize > SZ_16M)
70
		return EFI_INVALID_PARAMETER;
71

72
	size = romsize + sizeof(*rom);
73

74
	status = efi_call_early(allocate_pool, EFI_LOADER_DATA, size, &rom);
75
	if (status != EFI_SUCCESS) {
76
		efi_printk(sys_table, "Failed to allocate memory for 'rom'\n");
77
		return status;
78
	}
79

80 81
	memset(rom, 0, sizeof(*rom));

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

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	status = efi_call_proto(efi_pci_io_protocol, pci.read, pci,
				EfiPciIoWidthUint16, PCI_VENDOR_ID, 1,
				&rom->vendor);
91

92 93
	if (status != EFI_SUCCESS) {
		efi_printk(sys_table, "Failed to read rom->vendor\n");
94
		goto free_struct;
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	}
96

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	status = efi_call_proto(efi_pci_io_protocol, pci.read, pci,
				EfiPciIoWidthUint16, PCI_DEVICE_ID, 1,
				&rom->devid);
100

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	if (status != EFI_SUCCESS) {
		efi_printk(sys_table, "Failed to read rom->devid\n");
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		goto free_struct;
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	}
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	status = efi_call_proto(efi_pci_io_protocol, get_location, pci,
				&rom->segment, &rom->bus, &rom->device,
				&rom->function);
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	if (status != EFI_SUCCESS)
		goto free_struct;

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	memcpy(rom->romdata, romimage, romsize);
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	return status;

free_struct:
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	efi_call_early(free_pool, rom);
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	return status;
}

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/*
 * There's no way to return an informative status from this function,
 * because any analysis (and printing of error messages) needs to be
 * done directly at the EFI function call-site.
 *
 * For example, EFI_INVALID_PARAMETER could indicate a bug or maybe we
 * just didn't find any PCI devices, but there's no way to tell outside
 * the context of the call.
 */
static void setup_efi_pci(struct boot_params *params)
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{
	efi_status_t status;
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	void **pci_handle = NULL;
	efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
	unsigned long size = 0;
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	unsigned long nr_pci;
	struct setup_data *data;
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	efi_handle_t h;
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	int i;
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	status = efi_call_early(locate_handle,
				EFI_LOCATE_BY_PROTOCOL,
				&pci_proto, NULL, &size, pci_handle);
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	if (status == EFI_BUFFER_TOO_SMALL) {
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		status = efi_call_early(allocate_pool,
					EFI_LOADER_DATA,
					size, (void **)&pci_handle);
149

150
		if (status != EFI_SUCCESS) {
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			efi_printk(sys_table, "Failed to allocate memory for 'pci_handle'\n");
152
			return;
153
		}
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		status = efi_call_early(locate_handle,
					EFI_LOCATE_BY_PROTOCOL, &pci_proto,
					NULL, &size, pci_handle);
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	}

160
	if (status != EFI_SUCCESS)
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		goto free_handle;

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

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

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	for_each_efi_handle(h, pci_handle, size, i) {
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		efi_pci_io_protocol_t *pci = NULL;
		struct pci_setup_rom *rom;

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		status = efi_call_early(handle_protocol, h,
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					&pci_proto, (void **)&pci);
		if (status != EFI_SUCCESS || !pci)
			continue;

		status = preserve_pci_rom_image(pci, &rom);
		if (status != EFI_SUCCESS)
			continue;

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

		data = (struct setup_data *)rom;
	}
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free_handle:
190
	efi_call_early(free_pool, pci_handle);
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}
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static void retrieve_apple_device_properties(struct boot_params *boot_params)
{
	efi_guid_t guid = APPLE_PROPERTIES_PROTOCOL_GUID;
	struct setup_data *data, *new;
	efi_status_t status;
	u32 size = 0;
	void *p;

	status = efi_call_early(locate_protocol, &guid, NULL, &p);
	if (status != EFI_SUCCESS)
		return;

	if (efi_table_attr(apple_properties_protocol, version, p) != 0x10000) {
		efi_printk(sys_table, "Unsupported properties proto version\n");
		return;
	}

	efi_call_proto(apple_properties_protocol, get_all, p, NULL, &size);
	if (!size)
		return;

	do {
		status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
					size + sizeof(struct setup_data), &new);
		if (status != EFI_SUCCESS) {
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			efi_printk(sys_table, "Failed to allocate memory for 'properties'\n");
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			return;
		}

		status = efi_call_proto(apple_properties_protocol, get_all, p,
					new->data, &size);

		if (status == EFI_BUFFER_TOO_SMALL)
			efi_call_early(free_pool, new);
	} while (status == EFI_BUFFER_TOO_SMALL);

	new->type = SETUP_APPLE_PROPERTIES;
	new->len  = size;
	new->next = 0;

	data = (struct setup_data *)(unsigned long)boot_params->hdr.setup_data;
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	if (!data) {
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		boot_params->hdr.setup_data = (unsigned long)new;
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	} else {
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		while (data->next)
			data = (struct setup_data *)(unsigned long)data->next;
		data->next = (unsigned long)new;
	}
}

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static const efi_char16_t apple[] = L"Apple";

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static void setup_quirks(struct boot_params *boot_params)
{
	efi_char16_t *fw_vendor = (efi_char16_t *)(unsigned long)
		efi_table_attr(efi_system_table, fw_vendor, sys_table);

	if (!memcmp(fw_vendor, apple, sizeof(apple))) {
		if (IS_ENABLED(CONFIG_APPLE_PROPERTIES))
			retrieve_apple_device_properties(boot_params);
	}
}

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

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	status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
				size, (void **)&uga_handle);
	if (status != EFI_SUCCESS)
		return status;
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	status = efi_call_early(locate_handle,
				EFI_LOCATE_BY_PROTOCOL,
				uga_proto, NULL, &size, uga_handle);
	if (status != EFI_SUCCESS)
		goto free_handle;
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	height = 0;
	width = 0;
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	first_uga = NULL;
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	for_each_efi_handle(handle, uga_handle, size, i) {
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		efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
		u32 w, h, depth, refresh;
		void *pciio;

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		status = efi_call_early(handle_protocol, handle,
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					uga_proto, (void **)&uga);
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		if (status != EFI_SUCCESS)
			continue;

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		pciio = NULL;
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		efi_call_early(handle_protocol, handle, &pciio_proto, &pciio);
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		status = efi_call_proto(efi_uga_draw_protocol, get_mode, uga,
					&w, &h, &depth, &refresh);
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		if (status == EFI_SUCCESS && (!first_uga || pciio)) {
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			width = w;
			height = h;
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			/*
			 * Once we've found a UGA supporting PCIIO,
			 * don't bother looking any further.
			 */
			if (pciio)
				break;

			first_uga = uga;
		}
	}

315
	if (!width && !height)
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		goto free_handle;

	/* EFI framebuffer */
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	si->orig_video_isVGA	= VIDEO_TYPE_EFI;
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	si->lfb_depth		= 32;
	si->lfb_width		= width;
	si->lfb_height		= height;
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	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;
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free_handle:
335
	efi_call_early(free_pool, uga_handle);
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	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;
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	status = efi_call_early(locate_handle,
				EFI_LOCATE_BY_PROTOCOL,
				&graphics_proto, NULL, &size, gop_handle);
357
	if (status == EFI_BUFFER_TOO_SMALL)
358
		status = efi_setup_gop(NULL, si, &graphics_proto, size);
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	if (status != EFI_SUCCESS) {
		size = 0;
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		status = efi_call_early(locate_handle,
					EFI_LOCATE_BY_PROTOCOL,
					&uga_proto, NULL, &size, uga_handle);
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		if (status == EFI_BUFFER_TOO_SMALL)
			setup_uga(si, &uga_proto, size);
	}
}

/*
 * 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).
374 375 376
 *
 * The caller is responsible for filling out ->code32_start in the
 * returned boot_params.
377
 */
378
struct boot_params *make_boot_params(struct efi_config *c)
379
{
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	struct boot_params *boot_params;
	struct apm_bios_info *bi;
	struct setup_header *hdr;
	efi_loaded_image_t *image;
384
	void *handle;
385
	efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
386 387
	int options_size = 0;
	efi_status_t status;
388
	char *cmdline_ptr;
389 390
	unsigned long ramdisk_addr;
	unsigned long ramdisk_size;
391

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	efi_early = c;
	sys_table = (efi_system_table_t *)(unsigned long)efi_early->table;
	handle = (void *)(unsigned long)efi_early->image_handle;
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	/* Check if we were booted by the EFI firmware */
	if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
		return NULL;

400
	if (efi_is_64bit())
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		setup_boot_services64(efi_early);
	else
		setup_boot_services32(efi_early);

405 406
	status = efi_call_early(handle_protocol, handle,
				&proto, (void *)&image);
407
	if (status != EFI_SUCCESS) {
408
		efi_printk(sys_table, "Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
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		return NULL;
	}

412 413
	status = efi_low_alloc(sys_table, 0x4000, 1,
			       (unsigned long *)&boot_params);
414
	if (status != EFI_SUCCESS) {
415
		efi_printk(sys_table, "Failed to allocate lowmem for boot params\n");
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		return NULL;
	}

	memset(boot_params, 0x0, 0x4000);

	hdr = &boot_params->hdr;
	bi = &boot_params->apm_bios_info;

	/* 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.
	 */
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	hdr->root_flags	= 1;
	hdr->vid_mode	= 0xffff;
	hdr->boot_flag	= 0xAA55;
434

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	hdr->type_of_loader = 0x21;

	/* Convert unicode cmdline to ascii */
438
	cmdline_ptr = efi_convert_cmdline(sys_table, image, &options_size);
439 440
	if (!cmdline_ptr)
		goto fail;
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442
	hdr->cmd_line_ptr = (unsigned long)cmdline_ptr;
443 444
	/* Fill in upper bits of command line address, NOP on 32 bit  */
	boot_params->ext_cmd_line_ptr = (u64)(unsigned long)cmdline_ptr >> 32;
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	hdr->ramdisk_image = 0;
	hdr->ramdisk_size = 0;

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

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	status = efi_parse_options(cmdline_ptr);
	if (status != EFI_SUCCESS)
		goto fail2;

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	status = handle_cmdline_files(sys_table, image,
				      (char *)(unsigned long)hdr->cmd_line_ptr,
458
				      "initrd=", hdr->initrd_addr_max,
459
				      &ramdisk_addr, &ramdisk_size);
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	if (status != EFI_SUCCESS &&
	    hdr->xloadflags & XLF_CAN_BE_LOADED_ABOVE_4G) {
		efi_printk(sys_table, "Trying to load files to higher address\n");
		status = handle_cmdline_files(sys_table, image,
				      (char *)(unsigned long)hdr->cmd_line_ptr,
				      "initrd=", -1UL,
				      &ramdisk_addr, &ramdisk_size);
	}

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	if (status != EFI_SUCCESS)
		goto fail2;
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	hdr->ramdisk_image = ramdisk_addr & 0xffffffff;
	hdr->ramdisk_size  = ramdisk_size & 0xffffffff;
	boot_params->ext_ramdisk_image = (u64)ramdisk_addr >> 32;
	boot_params->ext_ramdisk_size  = (u64)ramdisk_size >> 32;
476 477

	return boot_params;
478

479
fail2:
480
	efi_free(sys_table, options_size, hdr->cmd_line_ptr);
481
fail:
482
	efi_free(sys_table, 0x4000, (unsigned long)boot_params);
483

484 485 486
	return NULL;
}

487 488
static void add_e820ext(struct boot_params *params,
			struct setup_data *e820ext, u32 nr_entries)
489
{
490
	struct setup_data *data;
491

492
	e820ext->type = SETUP_E820_EXT;
493
	e820ext->len  = nr_entries * sizeof(struct boot_e820_entry);
494
	e820ext->next = 0;
495

496
	data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
497

498 499
	while (data && data->next)
		data = (struct setup_data *)(unsigned long)data->next;
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	if (data)
		data->next = (unsigned long)e820ext;
	else
		params->hdr.setup_data = (unsigned long)e820ext;
}
506

507 508
static efi_status_t
setup_e820(struct boot_params *params, struct setup_data *e820ext, u32 e820ext_size)
509
{
510
	struct boot_e820_entry *entry = params->e820_table;
511
	struct efi_info *efi = &params->efi_info;
512
	struct boot_e820_entry *prev = NULL;
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	u32 nr_entries;
	u32 nr_desc;
	int i;
516 517

	nr_entries = 0;
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	nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size;

	for (i = 0; i < nr_desc; i++) {
521 522
		efi_memory_desc_t *d;
		unsigned int e820_type = 0;
523
		unsigned long m = efi->efi_memmap;
524

525 526 527 528
#ifdef CONFIG_X86_64
		m |= (u64)efi->efi_memmap_hi << 32;
#endif

529
		d = efi_early_memdesc_ptr(m, efi->efi_memdesc_size, i);
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		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:
537
			e820_type = E820_TYPE_RESERVED;
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			break;

		case EFI_UNUSABLE_MEMORY:
541
			e820_type = E820_TYPE_UNUSABLE;
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			break;

		case EFI_ACPI_RECLAIM_MEMORY:
545
			e820_type = E820_TYPE_ACPI;
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			break;

		case EFI_LOADER_CODE:
		case EFI_LOADER_DATA:
		case EFI_BOOT_SERVICES_CODE:
		case EFI_BOOT_SERVICES_DATA:
		case EFI_CONVENTIONAL_MEMORY:
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			if (efi_soft_reserve_enabled() &&
			    (d->attribute & EFI_MEMORY_SP))
				e820_type = E820_TYPE_SOFT_RESERVED;
			else
				e820_type = E820_TYPE_RAM;
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			break;

		case EFI_ACPI_MEMORY_NVS:
561
			e820_type = E820_TYPE_NVS;
562 563
			break;

564
		case EFI_PERSISTENT_MEMORY:
565
			e820_type = E820_TYPE_PMEM;
566 567
			break;

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		default:
			continue;
		}

		/* Merge adjacent mappings */
		if (prev && prev->type == e820_type &&
574
		    (prev->addr + prev->size) == d->phys_addr) {
575
			prev->size += d->num_pages << 12;
576
			continue;
577
		}
578

579
		if (nr_entries == ARRAY_SIZE(params->e820_table)) {
580
			u32 need = (nr_desc - i) * sizeof(struct e820_entry) +
581 582 583 584 585 586
				   sizeof(struct setup_data);

			if (!e820ext || e820ext_size < need)
				return EFI_BUFFER_TOO_SMALL;

			/* boot_params map full, switch to e820 extended */
587
			entry = (struct boot_e820_entry *)e820ext->data;
588 589
		}

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		entry->addr = d->phys_addr;
		entry->size = d->num_pages << PAGE_SHIFT;
		entry->type = e820_type;
		prev = entry++;
594
		nr_entries++;
595 596
	}

597 598
	if (nr_entries > ARRAY_SIZE(params->e820_table)) {
		u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_table);
599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615

		add_e820ext(params, e820ext, nr_e820ext);
		nr_entries -= nr_e820ext;
	}

	params->e820_entries = (u8)nr_entries;

	return EFI_SUCCESS;
}

static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext,
				  u32 *e820ext_size)
{
	efi_status_t status;
	unsigned long size;

	size = sizeof(struct setup_data) +
616
		sizeof(struct e820_entry) * nr_desc;
617 618

	if (*e820ext) {
619
		efi_call_early(free_pool, *e820ext);
620 621 622 623
		*e820ext = NULL;
		*e820ext_size = 0;
	}

624 625
	status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
				size, (void **)e820ext);
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	if (status == EFI_SUCCESS)
		*e820ext_size = size;

	return status;
}

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
static efi_status_t allocate_e820(struct boot_params *params,
				  struct setup_data **e820ext,
				  u32 *e820ext_size)
{
	unsigned long map_size, desc_size, buff_size;
	struct efi_boot_memmap boot_map;
	efi_memory_desc_t *map;
	efi_status_t status;
	__u32 nr_desc;

	boot_map.map		= &map;
	boot_map.map_size	= &map_size;
	boot_map.desc_size	= &desc_size;
	boot_map.desc_ver	= NULL;
	boot_map.key_ptr	= NULL;
	boot_map.buff_size	= &buff_size;

	status = efi_get_memory_map(sys_table, &boot_map);
	if (status != EFI_SUCCESS)
		return status;

	nr_desc = buff_size / desc_size;

	if (nr_desc > ARRAY_SIZE(params->e820_table)) {
		u32 nr_e820ext = nr_desc - ARRAY_SIZE(params->e820_table);

		status = alloc_e820ext(nr_e820ext, e820ext, e820ext_size);
		if (status != EFI_SUCCESS)
			return status;
	}

	return EFI_SUCCESS;
}

666
struct exit_boot_struct {
667 668
	struct boot_params	*boot_params;
	struct efi_info		*efi;
669 670 671 672 673 674 675 676 677
};

static efi_status_t exit_boot_func(efi_system_table_t *sys_table_arg,
				   struct efi_boot_memmap *map,
				   void *priv)
{
	const char *signature;
	struct exit_boot_struct *p = priv;

678 679
	signature = efi_is_64bit() ? EFI64_LOADER_SIGNATURE
				   : EFI32_LOADER_SIGNATURE;
680 681
	memcpy(&p->efi->efi_loader_signature, signature, sizeof(__u32));

682 683 684 685 686
	p->efi->efi_systab		= (unsigned long)sys_table_arg;
	p->efi->efi_memdesc_size	= *map->desc_size;
	p->efi->efi_memdesc_version	= *map->desc_ver;
	p->efi->efi_memmap		= (unsigned long)*map->map;
	p->efi->efi_memmap_size		= *map->map_size;
687 688

#ifdef CONFIG_X86_64
689 690
	p->efi->efi_systab_hi		= (unsigned long)sys_table_arg >> 32;
	p->efi->efi_memmap_hi		= (unsigned long)*map->map >> 32;
691 692 693 694 695
#endif

	return EFI_SUCCESS;
}

696
static efi_status_t exit_boot(struct boot_params *boot_params, void *handle)
697
{
698
	unsigned long map_sz, key, desc_size, buff_size;
699
	efi_memory_desc_t *mem_map;
700 701
	struct setup_data *e820ext = NULL;
	__u32 e820ext_size = 0;
702 703
	efi_status_t status;
	__u32 desc_version;
704
	struct efi_boot_memmap map;
705 706
	struct exit_boot_struct priv;

707 708 709 710 711 712 713 714
	map.map			= &mem_map;
	map.map_size		= &map_sz;
	map.desc_size		= &desc_size;
	map.desc_ver		= &desc_version;
	map.key_ptr		= &key;
	map.buff_size		= &buff_size;
	priv.boot_params	= boot_params;
	priv.efi		= &boot_params->efi_info;
715 716 717 718

	status = allocate_e820(boot_params, &e820ext, &e820ext_size);
	if (status != EFI_SUCCESS)
		return status;
719

720 721 722
	/* Might as well exit boot services now */
	status = efi_exit_boot_services(sys_table, handle, &map, &priv,
					exit_boot_func);
723 724 725 726
	if (status != EFI_SUCCESS)
		return status;

	/* Historic? */
727
	boot_params->alt_mem_k	= 32 * 1024;
728 729 730 731

	status = setup_e820(boot_params, e820ext, e820ext_size);
	if (status != EFI_SUCCESS)
		return status;
732 733 734 735

	return EFI_SUCCESS;
}

736 737 738 739
/*
 * On success we return a pointer to a boot_params structure, and NULL
 * on failure.
 */
740 741
struct boot_params *
efi_main(struct efi_config *c, struct boot_params *boot_params)
742
{
743
	struct desc_ptr *gdt = NULL;
744 745 746
	struct setup_header *hdr = &boot_params->hdr;
	efi_status_t status;
	struct desc_struct *desc;
747 748
	void *handle;
	efi_system_table_t *_table;
749
	unsigned long cmdline_paddr;
750 751 752 753 754

	efi_early = c;

	_table = (efi_system_table_t *)(unsigned long)efi_early->table;
	handle = (void *)(unsigned long)efi_early->image_handle;
755 756 757 758 759 760 761

	sys_table = _table;

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

762
	if (efi_is_64bit())
763 764 765 766
		setup_boot_services64(efi_early);
	else
		setup_boot_services32(efi_early);

767 768 769 770 771 772 773 774 775
	/*
	 * make_boot_params() may have been called before efi_main(), in which
	 * case this is the second time we parse the cmdline. This is ok,
	 * parsing the cmdline multiple times does not have side-effects.
	 */
	cmdline_paddr = ((u64)hdr->cmd_line_ptr |
			 ((u64)boot_params->ext_cmd_line_ptr << 32));
	efi_parse_options((char *)cmdline_paddr);

776 777 778 779 780 781
	/*
	 * If the boot loader gave us a value for secure_boot then we use that,
	 * otherwise we ask the BIOS.
	 */
	if (boot_params->secure_boot == efi_secureboot_mode_unset)
		boot_params->secure_boot = efi_get_secureboot(sys_table);
782 783 784

	/* Ask the firmware to clear memory on unclean shutdown */
	efi_enable_reset_attack_mitigation(sys_table);
785 786 787

	efi_random_get_seed(sys_table);

788
	efi_retrieve_tpm2_eventlog(sys_table);
789

790
	setup_graphics(boot_params);
791

792
	setup_efi_pci(boot_params);
793

794 795
	setup_quirks(boot_params);

796 797
	status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
				sizeof(*gdt), (void **)&gdt);
798
	if (status != EFI_SUCCESS) {
799
		efi_printk(sys_table, "Failed to allocate memory for 'gdt' structure\n");
800
		goto fail;
801
	}
802 803

	gdt->size = 0x800;
804
	status = efi_low_alloc(sys_table, gdt->size, 8,
805
			   (unsigned long *)&gdt->address);
806
	if (status != EFI_SUCCESS) {
807
		efi_printk(sys_table, "Failed to allocate memory for 'gdt'\n");
808
		goto fail;
809
	}
810

811 812 813 814 815
	/*
	 * If the kernel isn't already loaded at the preferred load
	 * address, relocate it.
	 */
	if (hdr->pref_address != hdr->code32_start) {
816 817 818 819
		unsigned long bzimage_addr = hdr->code32_start;
		status = efi_relocate_kernel(sys_table, &bzimage_addr,
					     hdr->init_size, hdr->init_size,
					     hdr->pref_address,
820 821
					     hdr->kernel_alignment,
					     LOAD_PHYSICAL_ADDR);
822 823
		if (status != EFI_SUCCESS) {
			efi_printk(sys_table, "efi_relocate_kernel() failed!\n");
824
			goto fail;
825
		}
826 827 828

		hdr->pref_address = hdr->code32_start;
		hdr->code32_start = bzimage_addr;
829 830
	}

831
	status = exit_boot(boot_params, handle);
832 833
	if (status != EFI_SUCCESS) {
		efi_printk(sys_table, "exit_boot() failed!\n");
834
		goto fail;
835
	}
836 837 838 839

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

840 841 842 843 844
	/* The first GDT is a dummy. */
	desc++;

	if (IS_ENABLED(CONFIG_X86_64)) {
		/* __KERNEL32_CS */
845 846 847 848 849 850 851 852 853 854 855 856 857 858
		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->limit1	= 0xf;
		desc->avl	= 0;
		desc->l		= 0;
		desc->d		= SEG_OP_SIZE_32BIT;
		desc->g		= SEG_GRANULARITY_4KB;
		desc->base2	= 0x00;

859 860 861 862 863
		desc++;
	} else {
		/* Second entry is unused on 32-bit */
		desc++;
	}
864

865
	/* __KERNEL_CS */
866 867 868 869 870 871 872 873 874 875
	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->limit1	= 0xf;
	desc->avl	= 0;

876 877 878 879 880 881 882
	if (IS_ENABLED(CONFIG_X86_64)) {
		desc->l = 1;
		desc->d = 0;
	} else {
		desc->l = 0;
		desc->d = SEG_OP_SIZE_32BIT;
	}
883 884
	desc->g		= SEG_GRANULARITY_4KB;
	desc->base2	= 0x00;
885
	desc++;
886 887

	/* __KERNEL_DS */
888 889 890 891 892 893 894 895 896 897 898 899 900
	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->limit1	= 0xf;
	desc->avl	= 0;
	desc->l		= 0;
	desc->d		= SEG_OP_SIZE_32BIT;
	desc->g		= SEG_GRANULARITY_4KB;
	desc->base2	= 0x00;
901
	desc++;
902 903 904

	if (IS_ENABLED(CONFIG_X86_64)) {
		/* Task segment value */
905 906 907 908 909 910 911 912 913 914 915 916 917
		desc->limit0	= 0x0000;
		desc->base0	= 0x0000;
		desc->base1	= 0x0000;
		desc->type	= SEG_TYPE_TSS;
		desc->s		= 0;
		desc->dpl	= 0;
		desc->p		= 1;
		desc->limit1	= 0x0;
		desc->avl	= 0;
		desc->l		= 0;
		desc->d		= 0;
		desc->g		= SEG_GRANULARITY_4KB;
		desc->base2	= 0x00;
918 919
		desc++;
	}
920 921

	asm volatile("cli");
922
	asm volatile ("lgdt %0" : : "m" (*gdt));
923 924 925

	return boot_params;
fail:
926
	efi_printk(sys_table, "efi_main() failed!\n");
927

928 929
	return NULL;
}
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