eboot.c 35.7 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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struct efi_config *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;				\
	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;
	}

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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)
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{
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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)
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{
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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;
		func = (u64 *)output_string;

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

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

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

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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)
		return status;
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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)
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		goto free_struct;

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

	if (status != EFI_SUCCESS)
		goto free_struct;

	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;
}

static efi_status_t
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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	}
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	return status;
}
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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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	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)
		return status;

	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));

	if (status != EFI_SUCCESS)
		goto free_struct;

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

	if (status != EFI_SUCCESS)
		goto free_struct;

	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;

}

static efi_status_t
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;
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		else
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			params->hdr.setup_data = (unsigned long)rom;
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		data = (struct setup_data *)rom;

	}

	return status;
}

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static efi_status_t 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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	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)
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			return status;
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		status = efi_call_early(locate_handle,
					EFI_LOCATE_BY_PROTOCOL, &pci_proto,
					NULL, &size, pci_handle);
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	}

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	if (status != EFI_SUCCESS)
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		goto free_handle;

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	if (efi_early->is64)
		status = setup_efi_pci64(params, pci_handle, size);
	else
		status = setup_efi_pci32(params, pci_handle, size);
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free_handle:
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	efi_call_early(free_pool, pci_handle);
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	return status;
}
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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;
	}
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}

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];

647 648
		status = efi_call_early(handle_protocol, h,
					proto, (void **)&gop32);
649 650 651
		if (status != EFI_SUCCESS)
			continue;

652 653
		status = efi_call_early(handle_protocol, h,
					&conout_proto, &dummy);
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
		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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696 697
	si->lfb_size = si->lfb_linelength * si->lfb_height;

698
	si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
699 700 701
out:
	return status;
}
702

703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749
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];

750 751
		status = efi_call_early(handle_protocol, h,
					proto, (void **)&gop64);
752 753 754
		if (status != EFI_SUCCESS)
			continue;

755 756
		status = efi_call_early(handle_protocol, h,
					&conout_proto, &dummy);
757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802
		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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803 804 805 806
	return status;
}

/*
807
 * See if we have Graphics Output Protocol
M
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808
 */
809
static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto,
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810 811 812
			      unsigned long size)
{
	efi_status_t status;
813
	void **gop_handle = NULL;
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814

815 816
	status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
				size, (void **)&gop_handle);
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817 818 819
	if (status != EFI_SUCCESS)
		return status;

820 821 822
	status = efi_call_early(locate_handle,
				EFI_LOCATE_BY_PROTOCOL,
				proto, NULL, &size, gop_handle);
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823 824 825
	if (status != EFI_SUCCESS)
		goto free_handle;

826 827 828 829 830 831
	if (efi_early->is64)
		status = setup_gop64(si, proto, size, gop_handle);
	else
		status = setup_gop32(si, proto, size, gop_handle);

free_handle:
832
	efi_call_early(free_pool, gop_handle);
833 834 835 836 837 838 839 840 841 842 843 844 845
	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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846
	first_uga = NULL;
847 848 849 850 851 852 853
	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];

854 855
		status = efi_call_early(handle_protocol, handle,
					&uga_proto, (void **)&uga);
856 857 858
		if (status != EFI_SUCCESS)
			continue;

859
		efi_call_early(handle_protocol, handle, &pciio_proto, &pciio);
860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879

		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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880

881 882 883 884 885 886 887 888 889 890 891 892
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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893 894 895 896
	for (i = 0; i < nr_ugas; i++) {
		efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
		u32 w, h, depth, refresh;
		void *pciio;
897
		u64 handle = handles[i];
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Matt Fleming 已提交
898

899 900
		status = efi_call_early(handle_protocol, handle,
					&uga_proto, (void **)&uga);
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901 902 903
		if (status != EFI_SUCCESS)
			continue;

904
		efi_call_early(handle_protocol, handle, &pciio_proto, &pciio);
M
Matt Fleming 已提交
905

906 907
		status = efi_early->call((unsigned long)uga->get_mode, uga,
					 &w, &h, &depth, &refresh);
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Matt Fleming 已提交
908
		if (status == EFI_SUCCESS && (!first_uga || pciio)) {
909 910
			*width = w;
			*height = h;
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911 912 913 914 915 916 917 918 919 920 921 922

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

			first_uga = uga;
		}
	}

923 924 925 926 927 928 929 930 931 932 933 934 935
	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;

936 937
	status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
				size, (void **)&uga_handle);
938 939 940
	if (status != EFI_SUCCESS)
		return status;

941 942 943
	status = efi_call_early(locate_handle,
				EFI_LOCATE_BY_PROTOCOL,
				uga_proto, NULL, &size, uga_handle);
944 945 946 947 948 949 950 951 952 953 954 955
	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)
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Matt Fleming 已提交
956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974
		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:
975
	efi_call_early(free_pool, uga_handle);
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Matt Fleming 已提交
976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992
	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;
993 994 995
	status = efi_call_early(locate_handle,
				EFI_LOCATE_BY_PROTOCOL,
				&graphics_proto, NULL, &size, gop_handle);
M
Matt Fleming 已提交
996 997 998 999 1000
	if (status == EFI_BUFFER_TOO_SMALL)
		status = setup_gop(si, &graphics_proto, size);

	if (status != EFI_SUCCESS) {
		size = 0;
1001 1002 1003
		status = efi_call_early(locate_handle,
					EFI_LOCATE_BY_PROTOCOL,
					&uga_proto, NULL, &size, uga_handle);
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1004 1005 1006 1007 1008 1009 1010 1011 1012
		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).
1013 1014 1015
 *
 * The caller is responsible for filling out ->code32_start in the
 * returned boot_params.
M
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1016
 */
1017
struct boot_params *make_boot_params(struct efi_config *c)
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1018
{
M
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1019 1020 1021 1022 1023 1024
	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;
1025
	void *options, *handle;
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1026
	efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
M
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1027 1028
	int options_size = 0;
	efi_status_t status;
1029
	char *cmdline_ptr;
M
Matt Fleming 已提交
1030 1031 1032
	u16 *s2;
	u8 *s1;
	int i;
1033 1034
	unsigned long ramdisk_addr;
	unsigned long ramdisk_size;
1035
	unsigned long initrd_addr_max;
M
Matt Fleming 已提交
1036

1037 1038 1039
	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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1040 1041 1042 1043 1044

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

1045 1046 1047 1048 1049
	if (efi_early->is64)
		setup_boot_services64(efi_early);
	else
		setup_boot_services32(efi_early);

1050 1051
	status = efi_call_early(handle_protocol, handle,
				&proto, (void *)&image);
M
Matt Fleming 已提交
1052
	if (status != EFI_SUCCESS) {
1053
		efi_printk(sys_table, "Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
M
Matt Fleming 已提交
1054 1055 1056
		return NULL;
	}

1057 1058
	status = efi_low_alloc(sys_table, 0x4000, 1,
			       (unsigned long *)&boot_params);
M
Matt Fleming 已提交
1059
	if (status != EFI_SUCCESS) {
1060
		efi_printk(sys_table, "Failed to alloc lowmem for boot params\n");
M
Matt Fleming 已提交
1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081
		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
1082 1083 1084
	hdr->type_of_loader = 0x21;

	/* Convert unicode cmdline to ascii */
1085
	cmdline_ptr = efi_convert_cmdline(sys_table, image, &options_size);
1086 1087 1088
	if (!cmdline_ptr)
		goto fail;
	hdr->cmd_line_ptr = (unsigned long)cmdline_ptr;
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1089 1090 1091 1092 1093 1094 1095 1096 1097

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

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

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

1098 1099 1100 1101 1102
	if (hdr->xloadflags & XLF_CAN_BE_LOADED_ABOVE_4G)
		initrd_addr_max = -1UL;
	else
		initrd_addr_max = hdr->initrd_addr_max;

1103 1104
	status = handle_cmdline_files(sys_table, image,
				      (char *)(unsigned long)hdr->cmd_line_ptr,
1105
				      "initrd=", initrd_addr_max,
1106
				      &ramdisk_addr, &ramdisk_size);
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Matt Fleming 已提交
1107 1108
	if (status != EFI_SUCCESS)
		goto fail2;
1109 1110 1111 1112
	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
1113 1114 1115

	return boot_params;
fail2:
1116
	efi_free(sys_table, options_size, hdr->cmd_line_ptr);
M
Matt Fleming 已提交
1117
fail:
1118
	efi_free(sys_table, 0x4000, (unsigned long)boot_params);
M
Matt Fleming 已提交
1119 1120 1121
	return NULL;
}

1122 1123
static void add_e820ext(struct boot_params *params,
			struct setup_data *e820ext, u32 nr_entries)
M
Matt Fleming 已提交
1124
{
1125
	struct setup_data *data;
M
Matt Fleming 已提交
1126
	efi_status_t status;
1127
	unsigned long size;
M
Matt Fleming 已提交
1128

1129 1130 1131
	e820ext->type = SETUP_E820_EXT;
	e820ext->len = nr_entries * sizeof(struct e820entry);
	e820ext->next = 0;
M
Matt Fleming 已提交
1132

1133
	data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
M
Matt Fleming 已提交
1134

1135 1136
	while (data && data->next)
		data = (struct setup_data *)(unsigned long)data->next;
1137

1138 1139 1140 1141 1142
	if (data)
		data->next = (unsigned long)e820ext;
	else
		params->hdr.setup_data = (unsigned long)e820ext;
}
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1143

1144 1145 1146 1147 1148 1149 1150 1151 1152
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
1153 1154

	nr_entries = 0;
1155 1156 1157
	nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size;

	for (i = 0; i < nr_desc; i++) {
M
Matt Fleming 已提交
1158 1159
		efi_memory_desc_t *d;
		unsigned int e820_type = 0;
1160
		unsigned long m = efi->efi_memmap;
M
Matt Fleming 已提交
1161

1162
		d = (efi_memory_desc_t *)(m + (i * efi->efi_memdesc_size));
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1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198
		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 &&
1199
		    (prev->addr + prev->size) == d->phys_addr) {
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Matt Fleming 已提交
1200
			prev->size += d->num_pages << 12;
1201
			continue;
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Matt Fleming 已提交
1202
		}
1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219

		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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	}

1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243
	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) {
1244
		efi_call_early(free_pool, *e820ext);
1245 1246 1247 1248
		*e820ext = NULL;
		*e820ext_size = 0;
	}

1249 1250
	status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
				size, (void **)e820ext);
1251 1252 1253 1254 1255 1256 1257
	if (status == EFI_SUCCESS)
		*e820ext_size = size;

	return status;
}

static efi_status_t exit_boot(struct boot_params *boot_params,
1258
			      void *handle, bool is64)
1259 1260 1261 1262 1263
{
	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;
1264
	const char *signature;
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
	__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;

1294
		efi_call_early(free_pool, mem_map);
1295 1296 1297
		goto get_map; /* Allocated memory, get map again */
	}

1298 1299 1300
	signature = is64 ? EFI64_LOADER_SIGNATURE : EFI32_LOADER_SIGNATURE;
	memcpy(&efi->efi_loader_signature, signature, sizeof(__u32));

1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312
	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 */
1313
	status = efi_call_early(exit_boot_services, handle, key);
1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325
	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;
1326
		efi_call_early(free_pool, mem_map);
1327 1328 1329 1330 1331 1332 1333 1334 1335
		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:
1340
	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.
 */
1348
struct boot_params *efi_main(struct efi_config *c,
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			     struct boot_params *boot_params)
{
1351
	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;
1356 1357 1358 1359 1360 1361 1362 1363 1364
	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;

1372 1373 1374 1375 1376
	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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1379 1380 1381 1382
	status = setup_efi_pci(boot_params);
	if (status != EFI_SUCCESS) {
		efi_printk(sys_table, "setup_efi_pci() failed!\n");
	}
1383

1384 1385
	status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
				sizeof(*gdt), (void **)&gdt);
1386
	if (status != EFI_SUCCESS) {
1387
		efi_printk(sys_table, "Failed to alloc mem for gdt structure\n");
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		goto fail;
1389
	}
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	gdt->size = 0x800;
1392
	status = efi_low_alloc(sys_table, gdt->size, 8,
1393
			   (unsigned long *)&gdt->address);
1394
	if (status != EFI_SUCCESS) {
1395
		efi_printk(sys_table, "Failed to alloc mem for gdt\n");
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		goto fail;
1397
	}
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1398

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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) {
1404 1405 1406 1407 1408
		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);
1409 1410
		if (status != EFI_SUCCESS) {
			efi_printk(sys_table, "efi_relocate_kernel() failed!\n");
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			goto fail;
1412
		}
1413 1414 1415

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

1418
	status = exit_boot(boot_params, handle, is64);
1419 1420
	if (status != EFI_SUCCESS) {
		efi_printk(sys_table, "exit_boot() failed!\n");
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		goto fail;
1422
	}
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1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 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

	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");
1478
	asm volatile ("lgdt %0" : : "m" (*gdt));
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	return boot_params;
fail:
1482
	efi_printk(sys_table, "efi_main() failed!\n");
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	return NULL;
}