eboot.c 36.8 KB
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/* -----------------------------------------------------------------------
 *
 *   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>
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#include <linux/pci.h>
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#include <asm/efi.h>
#include <asm/setup.h>
#include <asm/desc.h>

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

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#include "eboot.h"

static efi_system_table_t *sys_table;

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static struct efi_config *efi_early;

#define efi_call_early(f, ...)						\
	efi_early->call(efi_early->f, __VA_ARGS__);
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#define BOOT_SERVICES(bits)						\
static void setup_boot_services##bits(struct efi_config *c)		\
{									\
	efi_system_table_##bits##_t *table;				\
	efi_boot_services_##bits##_t *bt;				\
									\
	table = (typeof(table))sys_table;				\
									\
	c->text_output = table->con_out;				\
									\
	bt = (typeof(bt))(unsigned long)(table->boottime);		\
									\
	c->allocate_pool = bt->allocate_pool;				\
	c->allocate_pages = bt->allocate_pages;				\
	c->get_memory_map = bt->get_memory_map;				\
	c->free_pool = bt->free_pool;					\
	c->free_pages = bt->free_pages;					\
	c->locate_handle = bt->locate_handle;				\
	c->handle_protocol = bt->handle_protocol;			\
	c->exit_boot_services = bt->exit_boot_services;			\
}
BOOT_SERVICES(32);
BOOT_SERVICES(64);
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void efi_char16_printk(efi_system_table_t *, efi_char16_t *);
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static efi_status_t
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__file_size32(void *__fh, efi_char16_t *filename_16,
	      void **handle, u64 *file_sz)
{
	efi_file_handle_32_t *h, *fh = __fh;
	efi_file_info_t *info;
	efi_status_t status;
	efi_guid_t info_guid = EFI_FILE_INFO_ID;
	u32 info_sz;

	status = efi_early->call((unsigned long)fh->open, fh, &h, filename_16,
				 EFI_FILE_MODE_READ, (u64)0);
	if (status != EFI_SUCCESS) {
		efi_printk(sys_table, "Failed to open file: ");
		efi_char16_printk(sys_table, filename_16);
		efi_printk(sys_table, "\n");
		return status;
	}

	*handle = h;

	info_sz = 0;
	status = efi_early->call((unsigned long)h->get_info, h, &info_guid,
				 &info_sz, NULL);
	if (status != EFI_BUFFER_TOO_SMALL) {
		efi_printk(sys_table, "Failed to get file info size\n");
		return status;
	}

grow:
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	status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
				info_sz, (void **)&info);
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	if (status != EFI_SUCCESS) {
		efi_printk(sys_table, "Failed to alloc mem for file info\n");
		return status;
	}

	status = efi_early->call((unsigned long)h->get_info, h, &info_guid,
				 &info_sz, info);
	if (status == EFI_BUFFER_TOO_SMALL) {
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		efi_call_early(free_pool, info);
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		goto grow;
	}

	*file_sz = info->file_size;
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	efi_call_early(free_pool, info);
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	if (status != EFI_SUCCESS)
		efi_printk(sys_table, "Failed to get initrd info\n");

	return status;
}

static efi_status_t
__file_size64(void *__fh, efi_char16_t *filename_16,
	      void **handle, u64 *file_sz)
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{
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	efi_file_handle_64_t *h, *fh = __fh;
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	efi_file_info_t *info;
	efi_status_t status;
	efi_guid_t info_guid = EFI_FILE_INFO_ID;
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	u64 info_sz;
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	status = efi_early->call((unsigned long)fh->open, fh, &h, filename_16,
				 EFI_FILE_MODE_READ, (u64)0);
	if (status != EFI_SUCCESS) {
		efi_printk(sys_table, "Failed to open file: ");
		efi_char16_printk(sys_table, filename_16);
		efi_printk(sys_table, "\n");
		return status;
	}

	*handle = h;

	info_sz = 0;
	status = efi_early->call((unsigned long)h->get_info, h, &info_guid,
				 &info_sz, NULL);
	if (status != EFI_BUFFER_TOO_SMALL) {
		efi_printk(sys_table, "Failed to get file info size\n");
		return status;
	}

grow:
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	status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
				info_sz, (void **)&info);
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	if (status != EFI_SUCCESS) {
		efi_printk(sys_table, "Failed to alloc mem for file info\n");
		return status;
	}

	status = efi_early->call((unsigned long)h->get_info, h, &info_guid,
				 &info_sz, info);
	if (status == EFI_BUFFER_TOO_SMALL) {
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		efi_call_early(free_pool, info);
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		goto grow;
	}

	*file_sz = info->file_size;
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	efi_call_early(free_pool, info);
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	if (status != EFI_SUCCESS)
		efi_printk(sys_table, "Failed to get initrd info\n");

	return status;
}
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efi_status_t
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efi_file_size(efi_system_table_t *sys_table, void *__fh,
	      efi_char16_t *filename_16, void **handle, u64 *file_sz)
{
	if (efi_early->is64)
		return __file_size64(__fh, filename_16, handle, file_sz);

	return __file_size32(__fh, filename_16, handle, file_sz);
}
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efi_status_t
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efi_file_read(void *handle, unsigned long *size, void *addr)
170
{
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	unsigned long func;

	if (efi_early->is64) {
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		efi_file_handle_64_t *fh = handle;
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		func = (unsigned long)fh->read;
		return efi_early->call(func, handle, size, addr);
	} else {
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		efi_file_handle_32_t *fh = handle;
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		func = (unsigned long)fh->read;
		return efi_early->call(func, handle, size, addr);
	}
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}

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efi_status_t efi_file_close(void *handle)
187
{
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	if (efi_early->is64) {
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		efi_file_handle_64_t *fh = handle;
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		return efi_early->call((unsigned long)fh->close, handle);
	} else {
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		efi_file_handle_32_t *fh = handle;
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		return efi_early->call((unsigned long)fh->close, handle);
	}
}

static inline efi_status_t __open_volume32(void *__image, void **__fh)
{
	efi_file_io_interface_t *io;
	efi_loaded_image_32_t *image = __image;
	efi_file_handle_32_t *fh;
	efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
	efi_status_t status;
	void *handle = (void *)(unsigned long)image->device_handle;
	unsigned long func;

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	status = efi_call_early(handle_protocol, handle,
				&fs_proto, (void **)&io);
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	if (status != EFI_SUCCESS) {
		efi_printk(sys_table, "Failed to handle fs_proto\n");
		return status;
	}

	func = (unsigned long)io->open_volume;
	status = efi_early->call(func, io, &fh);
	if (status != EFI_SUCCESS)
		efi_printk(sys_table, "Failed to open volume\n");
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	*__fh = fh;
	return status;
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}

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static inline efi_status_t __open_volume64(void *__image, void **__fh)
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{
	efi_file_io_interface_t *io;
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	efi_loaded_image_64_t *image = __image;
	efi_file_handle_64_t *fh;
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	efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
	efi_status_t status;
	void *handle = (void *)(unsigned long)image->device_handle;
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	unsigned long func;
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	status = efi_call_early(handle_protocol, handle,
				&fs_proto, (void **)&io);
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	if (status != EFI_SUCCESS) {
		efi_printk(sys_table, "Failed to handle fs_proto\n");
		return status;
	}
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	func = (unsigned long)io->open_volume;
	status = efi_early->call(func, io, &fh);
	if (status != EFI_SUCCESS)
		efi_printk(sys_table, "Failed to open volume\n");

	*__fh = fh;
	return status;
}

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efi_status_t
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efi_open_volume(efi_system_table_t *sys_table, void *__image, void **__fh)
{
	if (efi_early->is64)
		return __open_volume64(__image, __fh);

	return __open_volume32(__image, __fh);
}

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void efi_char16_printk(efi_system_table_t *table, efi_char16_t *str)
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{
	unsigned long output_string;
	size_t offset;

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	if (efi_early->is64) {
		struct efi_simple_text_output_protocol_64 *out;
		u64 *func;
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		offset = offsetof(typeof(*out), output_string);
		output_string = efi_early->text_output + offset;
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		out = (typeof(out))(unsigned long)efi_early->text_output;
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		func = (u64 *)output_string;

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		efi_early->call(*func, out, str);
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	} else {
		struct efi_simple_text_output_protocol_32 *out;
		u32 *func;

		offset = offsetof(typeof(*out), output_string);
		output_string = efi_early->text_output + offset;
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		out = (typeof(out))(unsigned long)efi_early->text_output;
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		func = (u32 *)output_string;

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		efi_early->call(*func, out, str);
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	}
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}

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#include "../../../../drivers/firmware/efi/libstub/efi-stub-helper.c"

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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;
}

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static efi_status_t
__setup_efi_pci32(efi_pci_io_protocol_32 *pci, struct pci_setup_rom **__rom)
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{
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	struct pci_setup_rom *rom = NULL;
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	efi_status_t status;
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	unsigned long size;
	uint64_t attributes;
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	status = efi_early->call(pci->attributes, pci,
				 EfiPciIoAttributeOperationGet, 0, 0,
				 &attributes);
	if (status != EFI_SUCCESS)
		return status;
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	if (!pci->romimage || !pci->romsize)
		return EFI_INVALID_PARAMETER;
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	size = pci->romsize + sizeof(*rom);
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	status = efi_call_early(allocate_pool, EFI_LOADER_DATA, size, &rom);
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	if (status != EFI_SUCCESS) {
		efi_printk(sys_table, "Failed to alloc mem for rom\n");
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		return status;
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	}
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	memset(rom, 0, sizeof(*rom));

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

	status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
				 PCI_VENDOR_ID, 1, &(rom->vendor));
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	if (status != EFI_SUCCESS) {
		efi_printk(sys_table, "Failed to read rom->vendor\n");
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		goto free_struct;
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	}
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	status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
				 PCI_DEVICE_ID, 1, &(rom->devid));

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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;
360
	}
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	status = efi_early->call(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);
	return status;

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

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static void
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setup_efi_pci32(struct boot_params *params, void **pci_handle,
		unsigned long size)
{
	efi_pci_io_protocol_32 *pci = NULL;
	efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
	u32 *handles = (u32 *)(unsigned long)pci_handle;
	efi_status_t status;
	unsigned long nr_pci;
	struct setup_data *data;
	int i;

	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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	nr_pci = size / sizeof(u32);
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	for (i = 0; i < nr_pci; i++) {
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		struct pci_setup_rom *rom = NULL;
		u32 h = handles[i];
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		status = efi_call_early(handle_protocol, h,
					&pci_proto, (void **)&pci);
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		if (status != EFI_SUCCESS)
			continue;

		if (!pci)
			continue;

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		status = __setup_efi_pci32(pci, &rom);
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		if (status != EFI_SUCCESS)
			continue;

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

		data = (struct setup_data *)rom;
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418 419
	}
}
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static efi_status_t
__setup_efi_pci64(efi_pci_io_protocol_64 *pci, struct pci_setup_rom **__rom)
{
	struct pci_setup_rom *rom;
	efi_status_t status;
	unsigned long size;
	uint64_t attributes;
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	status = efi_early->call(pci->attributes, pci,
				 EfiPciIoAttributeOperationGet, 0,
				 &attributes);
	if (status != EFI_SUCCESS)
		return status;
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	if (!pci->romimage || !pci->romsize)
		return EFI_INVALID_PARAMETER;
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438
	size = pci->romsize + sizeof(*rom);
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440
	status = efi_call_early(allocate_pool, EFI_LOADER_DATA, size, &rom);
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	if (status != EFI_SUCCESS) {
		efi_printk(sys_table, "Failed to alloc mem for rom\n");
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		return status;
444
	}
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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;
	*__rom = rom;

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

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	if (status != EFI_SUCCESS) {
		efi_printk(sys_table, "Failed to read rom->vendor\n");
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		goto free_struct;
458
	}
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	status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
				 PCI_DEVICE_ID, 1, &(rom->devid));

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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;
466
	}
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	status = efi_early->call(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);
	return status;

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

}

483
static void
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setup_efi_pci64(struct boot_params *params, void **pci_handle,
		unsigned long size)
{
	efi_pci_io_protocol_64 *pci = NULL;
	efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
	u64 *handles = (u64 *)(unsigned long)pci_handle;
	efi_status_t status;
	unsigned long nr_pci;
	struct setup_data *data;
	int i;
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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;

	nr_pci = size / sizeof(u64);
	for (i = 0; i < nr_pci; i++) {
		struct pci_setup_rom *rom = NULL;
		u64 h = handles[i];

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

		if (!pci)
			continue;
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		status = __setup_efi_pci64(pci, &rom);
		if (status != EFI_SUCCESS)
			continue;
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		if (data)
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			data->next = (unsigned long)rom;
520
		else
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			params->hdr.setup_data = (unsigned long)rom;
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		data = (struct setup_data *)rom;

	}
}

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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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	status = efi_call_early(locate_handle,
				EFI_LOCATE_BY_PROTOCOL,
				&pci_proto, NULL, &size, pci_handle);
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548
	if (status == EFI_BUFFER_TOO_SMALL) {
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		status = efi_call_early(allocate_pool,
					EFI_LOADER_DATA,
					size, (void **)&pci_handle);
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		if (status != EFI_SUCCESS) {
			efi_printk(sys_table, "Failed to alloc mem for pci_handle\n");
555
			return;
556
		}
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		status = efi_call_early(locate_handle,
					EFI_LOCATE_BY_PROTOCOL, &pci_proto,
					NULL, &size, pci_handle);
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	}

563
	if (status != EFI_SUCCESS)
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		goto free_handle;

566
	if (efi_early->is64)
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		setup_efi_pci64(params, pci_handle, size);
568
	else
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		setup_efi_pci32(params, pci_handle, size);
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571
free_handle:
572
	efi_call_early(free_pool, pci_handle);
573
}
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static void
setup_pixel_info(struct screen_info *si, u32 pixels_per_scan_line,
		 struct efi_pixel_bitmask pixel_info, int pixel_format)
{
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	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;
	}
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
}

static efi_status_t
__gop_query32(struct efi_graphics_output_protocol_32 *gop32,
	      struct efi_graphics_output_mode_info **info,
	      unsigned long *size, u32 *fb_base)
{
	struct efi_graphics_output_protocol_mode_32 *mode;
	efi_status_t status;
	unsigned long m;

	m = gop32->mode;
	mode = (struct efi_graphics_output_protocol_mode_32 *)m;

	status = efi_early->call(gop32->query_mode, gop32,
				 mode->mode, size, info);
	if (status != EFI_SUCCESS)
		return status;

	*fb_base = mode->frame_buffer_base;
	return status;
}

static efi_status_t
setup_gop32(struct screen_info *si, efi_guid_t *proto,
	    unsigned long size, void **gop_handle)
{
	struct efi_graphics_output_protocol_32 *gop32, *first_gop;
	unsigned long nr_gops;
	u16 width, height;
	u32 pixels_per_scan_line;
	u32 fb_base;
	struct efi_pixel_bitmask pixel_info;
	int pixel_format;
	efi_status_t status;
	u32 *handles = (u32 *)(unsigned long)gop_handle;
	int i;

	first_gop = NULL;
	gop32 = NULL;

	nr_gops = size / sizeof(u32);
	for (i = 0; i < nr_gops; i++) {
		struct efi_graphics_output_mode_info *info = NULL;
		efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
		bool conout_found = false;
		void *dummy = NULL;
		u32 h = handles[i];

672 673
		status = efi_call_early(handle_protocol, h,
					proto, (void **)&gop32);
674 675 676
		if (status != EFI_SUCCESS)
			continue;

677 678
		status = efi_call_early(handle_protocol, h,
					&conout_proto, &dummy);
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
		if (status == EFI_SUCCESS)
			conout_found = true;

		status = __gop_query32(gop32, &info, &size, &fb_base);
		if (status == EFI_SUCCESS && (!first_gop || conout_found)) {
			/*
			 * 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.
			 */
			width = info->horizontal_resolution;
			height = info->vertical_resolution;
			pixel_format = info->pixel_format;
			pixel_info = info->pixel_information;
			pixels_per_scan_line = info->pixels_per_scan_line;

			/*
			 * Once we've found a GOP supporting ConOut,
			 * don't bother looking any further.
			 */
			first_gop = gop32;
			if (conout_found)
				break;
		}
	}

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

	/* 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;

	setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format);
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721 722
	si->lfb_size = si->lfb_linelength * si->lfb_height;

723
	si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
724 725 726
out:
	return status;
}
727

728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774
static efi_status_t
__gop_query64(struct efi_graphics_output_protocol_64 *gop64,
	      struct efi_graphics_output_mode_info **info,
	      unsigned long *size, u32 *fb_base)
{
	struct efi_graphics_output_protocol_mode_64 *mode;
	efi_status_t status;
	unsigned long m;

	m = gop64->mode;
	mode = (struct efi_graphics_output_protocol_mode_64 *)m;

	status = efi_early->call(gop64->query_mode, gop64,
				 mode->mode, size, info);
	if (status != EFI_SUCCESS)
		return status;

	*fb_base = mode->frame_buffer_base;
	return status;
}

static efi_status_t
setup_gop64(struct screen_info *si, efi_guid_t *proto,
	    unsigned long size, void **gop_handle)
{
	struct efi_graphics_output_protocol_64 *gop64, *first_gop;
	unsigned long nr_gops;
	u16 width, height;
	u32 pixels_per_scan_line;
	u32 fb_base;
	struct efi_pixel_bitmask pixel_info;
	int pixel_format;
	efi_status_t status;
	u64 *handles = (u64 *)(unsigned long)gop_handle;
	int i;

	first_gop = NULL;
	gop64 = NULL;

	nr_gops = size / sizeof(u64);
	for (i = 0; i < nr_gops; i++) {
		struct efi_graphics_output_mode_info *info = NULL;
		efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
		bool conout_found = false;
		void *dummy = NULL;
		u64 h = handles[i];

775 776
		status = efi_call_early(handle_protocol, h,
					proto, (void **)&gop64);
777 778 779
		if (status != EFI_SUCCESS)
			continue;

780 781
		status = efi_call_early(handle_protocol, h,
					&conout_proto, &dummy);
782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827
		if (status == EFI_SUCCESS)
			conout_found = true;

		status = __gop_query64(gop64, &info, &size, &fb_base);
		if (status == EFI_SUCCESS && (!first_gop || conout_found)) {
			/*
			 * 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.
			 */
			width = info->horizontal_resolution;
			height = info->vertical_resolution;
			pixel_format = info->pixel_format;
			pixel_info = info->pixel_information;
			pixels_per_scan_line = info->pixels_per_scan_line;

			/*
			 * Once we've found a GOP supporting ConOut,
			 * don't bother looking any further.
			 */
			first_gop = gop64;
			if (conout_found)
				break;
		}
	}

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

	/* 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;

	setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format);

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

	si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
out:
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Matt Fleming 已提交
828 829 830 831
	return status;
}

/*
832
 * See if we have Graphics Output Protocol
M
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833
 */
834
static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto,
M
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835 836 837
			      unsigned long size)
{
	efi_status_t status;
838
	void **gop_handle = NULL;
M
Matt Fleming 已提交
839

840 841
	status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
				size, (void **)&gop_handle);
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Matt Fleming 已提交
842 843 844
	if (status != EFI_SUCCESS)
		return status;

845 846 847
	status = efi_call_early(locate_handle,
				EFI_LOCATE_BY_PROTOCOL,
				proto, NULL, &size, gop_handle);
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Matt Fleming 已提交
848 849 850
	if (status != EFI_SUCCESS)
		goto free_handle;

851 852 853 854 855 856
	if (efi_early->is64)
		status = setup_gop64(si, proto, size, gop_handle);
	else
		status = setup_gop32(si, proto, size, gop_handle);

free_handle:
857
	efi_call_early(free_pool, gop_handle);
858 859 860 861 862 863 864 865 866 867 868 869 870
	return status;
}

static efi_status_t
setup_uga32(void **uga_handle, unsigned long size, u32 *width, u32 *height)
{
	struct efi_uga_draw_protocol *uga = NULL, *first_uga;
	efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
	unsigned long nr_ugas;
	u32 *handles = (u32 *)uga_handle;;
	efi_status_t status;
	int i;

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Matt Fleming 已提交
871
	first_uga = NULL;
872 873 874 875 876 877 878
	nr_ugas = size / sizeof(u32);
	for (i = 0; i < nr_ugas; i++) {
		efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
		u32 w, h, depth, refresh;
		void *pciio;
		u32 handle = handles[i];

879 880
		status = efi_call_early(handle_protocol, handle,
					&uga_proto, (void **)&uga);
881 882 883
		if (status != EFI_SUCCESS)
			continue;

884
		efi_call_early(handle_protocol, handle, &pciio_proto, &pciio);
885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904

		status = efi_early->call((unsigned long)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;
		}
	}

	return status;
}
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905

906 907 908 909 910 911 912 913 914 915 916 917
static efi_status_t
setup_uga64(void **uga_handle, unsigned long size, u32 *width, u32 *height)
{
	struct efi_uga_draw_protocol *uga = NULL, *first_uga;
	efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
	unsigned long nr_ugas;
	u64 *handles = (u64 *)uga_handle;;
	efi_status_t status;
	int i;

	first_uga = NULL;
	nr_ugas = size / sizeof(u64);
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Matt Fleming 已提交
918 919 920 921
	for (i = 0; i < nr_ugas; i++) {
		efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
		u32 w, h, depth, refresh;
		void *pciio;
922
		u64 handle = handles[i];
M
Matt Fleming 已提交
923

924 925
		status = efi_call_early(handle_protocol, handle,
					&uga_proto, (void **)&uga);
M
Matt Fleming 已提交
926 927 928
		if (status != EFI_SUCCESS)
			continue;

929
		efi_call_early(handle_protocol, handle, &pciio_proto, &pciio);
M
Matt Fleming 已提交
930

931 932
		status = efi_early->call((unsigned long)uga->get_mode, uga,
					 &w, &h, &depth, &refresh);
M
Matt Fleming 已提交
933
		if (status == EFI_SUCCESS && (!first_uga || pciio)) {
934 935
			*width = w;
			*height = h;
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Matt Fleming 已提交
936 937 938 939 940 941 942 943 944 945 946 947

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

			first_uga = uga;
		}
	}

948 949 950 951 952 953 954 955 956 957 958 959 960
	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)
{
	efi_status_t status;
	u32 width, height;
	void **uga_handle = NULL;

961 962
	status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
				size, (void **)&uga_handle);
963 964 965
	if (status != EFI_SUCCESS)
		return status;

966 967 968
	status = efi_call_early(locate_handle,
				EFI_LOCATE_BY_PROTOCOL,
				uga_proto, NULL, &size, uga_handle);
969 970 971 972 973 974 975 976 977 978 979 980
	if (status != EFI_SUCCESS)
		goto free_handle;

	height = 0;
	width = 0;

	if (efi_early->is64)
		status = setup_uga64(uga_handle, size, &width, &height);
	else
		status = setup_uga32(uga_handle, size, &width, &height);

	if (!width && !height)
M
Matt Fleming 已提交
981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999
		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:
1000
	efi_call_early(free_pool, uga_handle);
M
Matt Fleming 已提交
1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017
	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;
1018 1019 1020
	status = efi_call_early(locate_handle,
				EFI_LOCATE_BY_PROTOCOL,
				&graphics_proto, NULL, &size, gop_handle);
M
Matt Fleming 已提交
1021 1022 1023 1024 1025
	if (status == EFI_BUFFER_TOO_SMALL)
		status = setup_gop(si, &graphics_proto, size);

	if (status != EFI_SUCCESS) {
		size = 0;
1026 1027 1028
		status = efi_call_early(locate_handle,
					EFI_LOCATE_BY_PROTOCOL,
					&uga_proto, NULL, &size, uga_handle);
M
Matt Fleming 已提交
1029 1030 1031 1032 1033 1034 1035 1036 1037
		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).
1038 1039 1040
 *
 * The caller is responsible for filling out ->code32_start in the
 * returned boot_params.
M
Matt Fleming 已提交
1041
 */
1042
struct boot_params *make_boot_params(struct efi_config *c)
M
Matt Fleming 已提交
1043
{
M
Matt Fleming 已提交
1044 1045 1046 1047 1048 1049
	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;
1050
	void *options, *handle;
M
Matt Fleming 已提交
1051
	efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
M
Matt Fleming 已提交
1052 1053
	int options_size = 0;
	efi_status_t status;
1054
	char *cmdline_ptr;
M
Matt Fleming 已提交
1055 1056 1057
	u16 *s2;
	u8 *s1;
	int i;
1058 1059
	unsigned long ramdisk_addr;
	unsigned long ramdisk_size;
M
Matt Fleming 已提交
1060

1061 1062 1063
	efi_early = c;
	sys_table = (efi_system_table_t *)(unsigned long)efi_early->table;
	handle = (void *)(unsigned long)efi_early->image_handle;
M
Matt Fleming 已提交
1064 1065 1066 1067 1068

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

1069 1070 1071 1072 1073
	if (efi_early->is64)
		setup_boot_services64(efi_early);
	else
		setup_boot_services32(efi_early);

1074 1075
	status = efi_call_early(handle_protocol, handle,
				&proto, (void *)&image);
M
Matt Fleming 已提交
1076
	if (status != EFI_SUCCESS) {
1077
		efi_printk(sys_table, "Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
M
Matt Fleming 已提交
1078 1079 1080
		return NULL;
	}

1081 1082
	status = efi_low_alloc(sys_table, 0x4000, 1,
			       (unsigned long *)&boot_params);
M
Matt Fleming 已提交
1083
	if (status != EFI_SUCCESS) {
1084
		efi_printk(sys_table, "Failed to alloc lowmem for boot params\n");
M
Matt Fleming 已提交
1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105
		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;

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Matt Fleming 已提交
1106 1107 1108
	hdr->type_of_loader = 0x21;

	/* Convert unicode cmdline to ascii */
1109
	cmdline_ptr = efi_convert_cmdline(sys_table, image, &options_size);
1110 1111 1112
	if (!cmdline_ptr)
		goto fail;
	hdr->cmd_line_ptr = (unsigned long)cmdline_ptr;
M
Matt Fleming 已提交
1113 1114 1115 1116 1117 1118 1119 1120 1121

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

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

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

1122 1123 1124 1125
	status = efi_parse_options(cmdline_ptr);
	if (status != EFI_SUCCESS)
		goto fail2;

1126 1127
	status = handle_cmdline_files(sys_table, image,
				      (char *)(unsigned long)hdr->cmd_line_ptr,
1128
				      "initrd=", hdr->initrd_addr_max,
1129
				      &ramdisk_addr, &ramdisk_size);
1130 1131 1132 1133 1134 1135 1136 1137 1138 1139

	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);
	}

M
Matt Fleming 已提交
1140 1141
	if (status != EFI_SUCCESS)
		goto fail2;
1142 1143 1144 1145
	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;
M
Matt Fleming 已提交
1146 1147 1148

	return boot_params;
fail2:
1149
	efi_free(sys_table, options_size, hdr->cmd_line_ptr);
M
Matt Fleming 已提交
1150
fail:
1151
	efi_free(sys_table, 0x4000, (unsigned long)boot_params);
M
Matt Fleming 已提交
1152 1153 1154
	return NULL;
}

1155 1156
static void add_e820ext(struct boot_params *params,
			struct setup_data *e820ext, u32 nr_entries)
M
Matt Fleming 已提交
1157
{
1158
	struct setup_data *data;
M
Matt Fleming 已提交
1159
	efi_status_t status;
1160
	unsigned long size;
M
Matt Fleming 已提交
1161

1162 1163 1164
	e820ext->type = SETUP_E820_EXT;
	e820ext->len = nr_entries * sizeof(struct e820entry);
	e820ext->next = 0;
M
Matt Fleming 已提交
1165

1166
	data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
M
Matt Fleming 已提交
1167

1168 1169
	while (data && data->next)
		data = (struct setup_data *)(unsigned long)data->next;
1170

1171 1172 1173 1174 1175
	if (data)
		data->next = (unsigned long)e820ext;
	else
		params->hdr.setup_data = (unsigned long)e820ext;
}
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1176

1177 1178 1179 1180 1181 1182 1183 1184 1185
static efi_status_t setup_e820(struct boot_params *params,
			       struct setup_data *e820ext, u32 e820ext_size)
{
	struct e820entry *e820_map = &params->e820_map[0];
	struct efi_info *efi = &params->efi_info;
	struct e820entry *prev = NULL;
	u32 nr_entries;
	u32 nr_desc;
	int i;
M
Matt Fleming 已提交
1186 1187

	nr_entries = 0;
1188 1189 1190
	nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size;

	for (i = 0; i < nr_desc; i++) {
M
Matt Fleming 已提交
1191 1192
		efi_memory_desc_t *d;
		unsigned int e820_type = 0;
1193
		unsigned long m = efi->efi_memmap;
M
Matt Fleming 已提交
1194

1195
		d = (efi_memory_desc_t *)(m + (i * efi->efi_memdesc_size));
M
Matt Fleming 已提交
1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231
		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 &&
1232
		    (prev->addr + prev->size) == d->phys_addr) {
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			prev->size += d->num_pages << 12;
1234
			continue;
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		}
1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252

		if (nr_entries == ARRAY_SIZE(params->e820_map)) {
			u32 need = (nr_desc - i) * sizeof(struct e820entry) +
				   sizeof(struct setup_data);

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

			/* boot_params map full, switch to e820 extended */
			e820_map = (struct e820entry *)e820ext->data;
		}

		e820_map->addr = d->phys_addr;
		e820_map->size = d->num_pages << PAGE_SHIFT;
		e820_map->type = e820_type;
		prev = e820_map++;
		nr_entries++;
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	}

1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276
	if (nr_entries > ARRAY_SIZE(params->e820_map)) {
		u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_map);

		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) +
		sizeof(struct e820entry) * nr_desc;

	if (*e820ext) {
1277
		efi_call_early(free_pool, *e820ext);
1278 1279 1280 1281
		*e820ext = NULL;
		*e820ext_size = 0;
	}

1282 1283
	status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
				size, (void **)e820ext);
1284 1285 1286 1287 1288 1289 1290
	if (status == EFI_SUCCESS)
		*e820ext_size = size;

	return status;
}

static efi_status_t exit_boot(struct boot_params *boot_params,
1291
			      void *handle, bool is64)
1292 1293 1294 1295 1296
{
	struct efi_info *efi = &boot_params->efi_info;
	unsigned long map_sz, key, desc_size;
	efi_memory_desc_t *mem_map;
	struct setup_data *e820ext;
1297
	const char *signature;
1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326
	__u32 e820ext_size;
	__u32 nr_desc, prev_nr_desc;
	efi_status_t status;
	__u32 desc_version;
	bool called_exit = false;
	u8 nr_entries;
	int i;

	nr_desc = 0;
	e820ext = NULL;
	e820ext_size = 0;

get_map:
	status = efi_get_memory_map(sys_table, &mem_map, &map_sz, &desc_size,
				    &desc_version, &key);

	if (status != EFI_SUCCESS)
		return status;

	prev_nr_desc = nr_desc;
	nr_desc = map_sz / desc_size;
	if (nr_desc > prev_nr_desc &&
	    nr_desc > ARRAY_SIZE(boot_params->e820_map)) {
		u32 nr_e820ext = nr_desc - ARRAY_SIZE(boot_params->e820_map);

		status = alloc_e820ext(nr_e820ext, &e820ext, &e820ext_size);
		if (status != EFI_SUCCESS)
			goto free_mem_map;

1327
		efi_call_early(free_pool, mem_map);
1328 1329 1330
		goto get_map; /* Allocated memory, get map again */
	}

1331 1332 1333
	signature = is64 ? EFI64_LOADER_SIGNATURE : EFI32_LOADER_SIGNATURE;
	memcpy(&efi->efi_loader_signature, signature, sizeof(__u32));

1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345
	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 = map_sz;

#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 */
1346
	status = efi_call_early(exit_boot_services, handle, key);
1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358
	if (status != EFI_SUCCESS) {
		/*
		 * ExitBootServices() will fail if any of the event
		 * handlers change the memory map. In which case, we
		 * must be prepared to retry, but only once so that
		 * we're guaranteed to exit on repeated failures instead
		 * of spinning forever.
		 */
		if (called_exit)
			goto free_mem_map;

		called_exit = true;
1359
		efi_call_early(free_pool, mem_map);
1360 1361 1362 1363 1364 1365 1366 1367 1368
		goto get_map;
	}

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

	status = setup_e820(boot_params, e820ext, e820ext_size);
	if (status != EFI_SUCCESS)
		return status;
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	return EFI_SUCCESS;

free_mem_map:
1373
	efi_call_early(free_pool, mem_map);
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	return status;
}

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/*
 * On success we return a pointer to a boot_params structure, and NULL
 * on failure.
 */
1381
struct boot_params *efi_main(struct efi_config *c,
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			     struct boot_params *boot_params)
{
1384
	struct desc_ptr *gdt = NULL;
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	efi_loaded_image_t *image;
	struct setup_header *hdr = &boot_params->hdr;
	efi_status_t status;
	struct desc_struct *desc;
1389 1390 1391 1392 1393 1394 1395 1396 1397
	void *handle;
	efi_system_table_t *_table;
	bool is64;

	efi_early = c;

	_table = (efi_system_table_t *)(unsigned long)efi_early->table;
	handle = (void *)(unsigned long)efi_early->image_handle;
	is64 = efi_early->is64;
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	sys_table = _table;

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

1405 1406 1407 1408 1409
	if (is64)
		setup_boot_services64(efi_early);
	else
		setup_boot_services32(efi_early);

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	setup_graphics(boot_params);
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1412
	setup_efi_pci(boot_params);
1413

1414 1415
	status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
				sizeof(*gdt), (void **)&gdt);
1416
	if (status != EFI_SUCCESS) {
1417
		efi_printk(sys_table, "Failed to alloc mem for gdt structure\n");
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		goto fail;
1419
	}
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	gdt->size = 0x800;
1422
	status = efi_low_alloc(sys_table, gdt->size, 8,
1423
			   (unsigned long *)&gdt->address);
1424
	if (status != EFI_SUCCESS) {
1425
		efi_printk(sys_table, "Failed to alloc mem for gdt\n");
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		goto fail;
1427
	}
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	/*
	 * If the kernel isn't already loaded at the preferred load
	 * address, relocate it.
	 */
	if (hdr->pref_address != hdr->code32_start) {
1434 1435 1436 1437 1438
		unsigned long bzimage_addr = hdr->code32_start;
		status = efi_relocate_kernel(sys_table, &bzimage_addr,
					     hdr->init_size, hdr->init_size,
					     hdr->pref_address,
					     hdr->kernel_alignment);
1439 1440
		if (status != EFI_SUCCESS) {
			efi_printk(sys_table, "efi_relocate_kernel() failed!\n");
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			goto fail;
1442
		}
1443 1444 1445

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

1448
	status = exit_boot(boot_params, handle, is64);
1449 1450
	if (status != EFI_SUCCESS) {
		efi_printk(sys_table, "exit_boot() failed!\n");
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		goto fail;
1452
	}
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1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507

	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("cli");
1508
	asm volatile ("lgdt %0" : : "m" (*gdt));
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	return boot_params;
fail:
1512
	efi_printk(sys_table, "efi_main() failed!\n");
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	return NULL;
}