drivers/firmware/efi/efi-stub-helper.c - kernel/msm-5.4 - Gitiles

 /*
  * Helper functions used by the EFI stub on multiple
  * architectures. This should be #included by the EFI stub
  * implementation files.
  *
  * 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.
  *
  */
 #define EFI_READ_CHUNK_SIZE	(1024 * 1024)

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


 static void efi_char16_printk(efi_system_table_t *sys_table_arg,
 			      efi_char16_t *str)
 {
 	struct efi_simple_text_output_protocol *out;

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

 static void efi_printk(efi_system_table_t *sys_table_arg, char *str)
 {
 	char *s8;

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

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

 		efi_char16_printk(sys_table_arg, ch);
 	}
 }


 static efi_status_t efi_get_memory_map(efi_system_table_t *sys_table_arg,
 				       efi_memory_desc_t **map,
 				       unsigned long *map_size,
 				       unsigned long *desc_size,
 				       u32 *desc_ver,
 				       unsigned long *key_ptr)
 {
 	efi_memory_desc_t *m = NULL;
 	efi_status_t status;
 	unsigned long key;
 	u32 desc_version;

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

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

 	if (status != EFI_SUCCESS)
 		efi_call_phys1(sys_table_arg->boottime->free_pool, m);
 	if (key_ptr && status == EFI_SUCCESS)
 		*key_ptr = key;
 	if (desc_ver && status == EFI_SUCCESS)
 		*desc_ver = desc_version;

 fail:
 	*map = m;
 	return status;
 }

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

 	status = efi_get_memory_map(sys_table_arg, &map, &map_size, &desc_size,
 				    NULL, NULL);
 	if (status != EFI_SUCCESS)
 		goto fail;

 	/*
 	 * Enforce minimum alignment that EFI requires when requesting
 	 * a specific address.  We are doing page-based allocations,
 	 * so we must be aligned to a page.
 	 */
 	if (align < EFI_PAGE_SIZE)
 		align = EFI_PAGE_SIZE;

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

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

 		if (desc->num_pages < nr_pages)
 			continue;

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

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

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

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

 		start = round_down(end - size, align);

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

 		if (start > max_addr)
 			max_addr = start;
 	}

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

 		*addr = max_addr;
 	}

 	efi_call_phys1(sys_table_arg->boottime->free_pool, map);

 fail:
 	return status;
 }

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

 	status = efi_get_memory_map(sys_table_arg, &map, &map_size, &desc_size,
 				    NULL, NULL);
 	if (status != EFI_SUCCESS)
 		goto fail;

 	/*
 	 * Enforce minimum alignment that EFI requires when requesting
 	 * a specific address.  We are doing page-based allocations,
 	 * so we must be aligned to a page.
 	 */
 	if (align < EFI_PAGE_SIZE)
 		align = EFI_PAGE_SIZE;

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

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

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

 		if (desc->num_pages < nr_pages)
 			continue;

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

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

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

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

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

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

 static void efi_free(efi_system_table_t *sys_table_arg, unsigned long size,
 		     unsigned long addr)
 {
 	unsigned long nr_pages;

 	if (!size)
 		return;

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


 /*
  * Check the cmdline for a LILO-style file= arguments.
  *
  * We only support loading a file from the same filesystem as
  * the kernel image.
  */
 static efi_status_t handle_cmdline_files(efi_system_table_t *sys_table_arg,
 					 efi_loaded_image_t *image,
 					 char *cmd_line, char *option_string,
 					 unsigned long max_addr,
 					 unsigned long *load_addr,
 					 unsigned long *load_size)
 {
 	struct file_info *files;
 	unsigned long file_addr;
 	efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
 	u64 file_size_total;
 	efi_file_io_interface_t *io;
 	efi_file_handle_t *fh;
 	efi_status_t status;
 	int nr_files;
 	char *str;
 	int i, j, k;

 	file_addr = 0;
 	file_size_total = 0;

 	str = cmd_line;

 	j = 0;			/* See close_handles */

 	if (!load_addr || !load_size)
 		return EFI_INVALID_PARAMETER;

 	*load_addr = 0;
 	*load_size = 0;

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

 	for (nr_files = 0; *str; nr_files++) {
 		str = strstr(str, option_string);
 		if (!str)
 			break;

 		str += strlen(option_string);

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

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

 	if (!nr_files)
 		return EFI_SUCCESS;

 	status = efi_call_phys3(sys_table_arg->boottime->allocate_pool,
 				EFI_LOADER_DATA,
 				nr_files * sizeof(*files),
 				(void **)&files);
 	if (status != EFI_SUCCESS) {
 		efi_printk(sys_table_arg, "Failed to alloc mem for file handle list\n");
 		goto fail;
 	}

 	str = cmd_line;
 	for (i = 0; i < nr_files; i++) {
 		struct file_info *file;
 		efi_file_handle_t *h;
 		efi_file_info_t *info;
 		efi_char16_t filename_16[256];
 		unsigned long info_sz;
 		efi_guid_t info_guid = EFI_FILE_INFO_ID;
 		efi_char16_t *p;
 		u64 file_sz;

 		str = strstr(str, option_string);
 		if (!str)
 			break;

 		str += strlen(option_string);

 		file = &files[i];
 		p = filename_16;

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

 		while (*str && *str != ' ' && *str != '\n') {
 			if ((u8 *)p >= (u8 *)filename_16 + sizeof(filename_16))
 				break;

 			if (*str == '/') {
 				*p++ = '\\';
 				str++;
 			} else {
 				*p++ = *str++;
 			}
 		}

 		*p = '\0';

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

 			boottime = sys_table_arg->boottime;

 			status = efi_call_phys3(boottime->handle_protocol,
 					image->device_handle, &fs_proto,
 						(void **)&io);
 			if (status != EFI_SUCCESS) {
 				efi_printk(sys_table_arg, "Failed to handle fs_proto\n");
 				goto free_files;
 			}

 			status = efi_call_phys2(io->open_volume, io, &fh);
 			if (status != EFI_SUCCESS) {
 				efi_printk(sys_table_arg, "Failed to open volume\n");
 				goto free_files;
 			}
 		}

 		status = efi_call_phys5(fh->open, fh, &h, filename_16,
 					EFI_FILE_MODE_READ, (u64)0);
 		if (status != EFI_SUCCESS) {
 			efi_printk(sys_table_arg, "Failed to open file: ");
 			efi_char16_printk(sys_table_arg, filename_16);
 			efi_printk(sys_table_arg, "\n");
 			goto close_handles;
 		}

 		file->handle = h;

 		info_sz = 0;
 		status = efi_call_phys4(h->get_info, h, &info_guid,
 					&info_sz, NULL);
 		if (status != EFI_BUFFER_TOO_SMALL) {
 			efi_printk(sys_table_arg, "Failed to get file info size\n");
 			goto close_handles;
 		}

 grow:
 		status = efi_call_phys3(sys_table_arg->boottime->allocate_pool,
 					EFI_LOADER_DATA, info_sz,
 					(void **)&info);
 		if (status != EFI_SUCCESS) {
 			efi_printk(sys_table_arg, "Failed to alloc mem for file info\n");
 			goto close_handles;
 		}

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

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

 		if (status != EFI_SUCCESS) {
 			efi_printk(sys_table_arg, "Failed to get file info\n");
 			goto close_handles;
 		}

 		file->size = file_sz;
 		file_size_total += file_sz;
 	}

 	if (file_size_total) {
 		unsigned long addr;

 		/*
 		 * Multiple files need to be at consecutive addresses in memory,
 		 * so allocate enough memory for all the files.  This is used
 		 * for loading multiple files.
 		 */
 		status = efi_high_alloc(sys_table_arg, file_size_total, 0x1000,
 				    &file_addr, max_addr);
 		if (status != EFI_SUCCESS) {
 			efi_printk(sys_table_arg, "Failed to alloc highmem for files\n");
 			goto close_handles;
 		}

 		/* We've run out of free low memory. */
 		if (file_addr > max_addr) {
 			efi_printk(sys_table_arg, "We've run out of free low memory\n");
 			status = EFI_INVALID_PARAMETER;
 			goto free_file_total;
 		}

 		addr = file_addr;
 		for (j = 0; j < nr_files; j++) {
 			unsigned long size;

 			size = files[j].size;
 			while (size) {
 				unsigned long chunksize;
 				if (size > EFI_READ_CHUNK_SIZE)
 					chunksize = EFI_READ_CHUNK_SIZE;
 				else
 					chunksize = size;
 				status = efi_call_phys3(fh->read,
 							files[j].handle,
 							&chunksize,
 							(void *)addr);
 				if (status != EFI_SUCCESS) {
 					efi_printk(sys_table_arg, "Failed to read file\n");
 					goto free_file_total;
 				}
 				addr += chunksize;
 				size -= chunksize;
 			}

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

 	}

 	efi_call_phys1(sys_table_arg->boottime->free_pool, files);

 	*load_addr = file_addr;
 	*load_size = file_size_total;

 	return status;

 free_file_total:
 	efi_free(sys_table_arg, file_size_total, file_addr);

 close_handles:
 	for (k = j; k < i; k++)
 		efi_call_phys1(fh->close, files[k].handle);
 free_files:
 	efi_call_phys1(sys_table_arg->boottime->free_pool, files);
 fail:
 	*load_addr = 0;
 	*load_size = 0;

 	return status;
 }
 /*
  * Relocate a kernel image, either compressed or uncompressed.
  * In the ARM64 case, all kernel images are currently
  * uncompressed, and as such when we relocate it we need to
  * allocate additional space for the BSS segment. Any low
  * memory that this function should avoid needs to be
  * unavailable in the EFI memory map, as if the preferred
  * address is not available the lowest available address will
  * be used.
  */
 static efi_status_t efi_relocate_kernel(efi_system_table_t *sys_table_arg,
 					unsigned long *image_addr,
 					unsigned long image_size,
 					unsigned long alloc_size,
 					unsigned long preferred_addr,
 					unsigned long alignment)
 {
 	unsigned long cur_image_addr;
 	unsigned long new_addr = 0;
 	efi_status_t status;
 	unsigned long nr_pages;
 	efi_physical_addr_t efi_addr = preferred_addr;

 	if (!image_addr || !image_size || !alloc_size)
 		return EFI_INVALID_PARAMETER;
 	if (alloc_size < image_size)
 		return EFI_INVALID_PARAMETER;

 	cur_image_addr = *image_addr;

 	/*
 	 * The EFI firmware loader could have placed the kernel image
 	 * anywhere in memory, but the kernel has restrictions on the
 	 * max physical address it can run at.  Some architectures
 	 * also have a prefered address, so first try to relocate
 	 * to the preferred address.  If that fails, allocate as low
 	 * as possible while respecting the required alignment.
 	 */
 	nr_pages = round_up(alloc_size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
 	status = efi_call_phys4(sys_table_arg->boottime->allocate_pages,
 				EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
 				nr_pages, &efi_addr);
 	new_addr = efi_addr;
 	/*
 	 * If preferred address allocation failed allocate as low as
 	 * possible.
 	 */
 	if (status != EFI_SUCCESS) {
 		status = efi_low_alloc(sys_table_arg, alloc_size, alignment,
 				       &new_addr);
 	}
 	if (status != EFI_SUCCESS) {
 		efi_printk(sys_table_arg, "ERROR: Failed to allocate usable memory for kernel.\n");
 		return status;
 	}

 	/*
 	 * We know source/dest won't overlap since both memory ranges
 	 * have been allocated by UEFI, so we can safely use memcpy.
 	 */
 	memcpy((void *)new_addr, (void *)cur_image_addr, image_size);

 	/* Return the new address of the relocated image. */
 	*image_addr = new_addr;

 	return status;
 }

 /*
  * Convert the unicode UEFI command line to ASCII to pass to kernel.
  * Size of memory allocated return in *cmd_line_len.
  * Returns NULL on error.
  */
 static char *efi_convert_cmdline_to_ascii(efi_system_table_t *sys_table_arg,
 				      efi_loaded_image_t *image,
 				      int *cmd_line_len)
 {
 	u16 *s2;
 	u8 *s1 = NULL;
 	unsigned long cmdline_addr = 0;
 	int load_options_size = image->load_options_size / 2; /* ASCII */
 	void *options = image->load_options;
 	int options_size = 0;
 	efi_status_t status;
 	int i;
 	u16 zero = 0;

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

 	if (options_size == 0) {
 		/* No command line options, so return empty string*/
 		options_size = 1;
 		options = &zero;
 	}

 	options_size++;  /* NUL termination */
 #ifdef CONFIG_ARM
 	/*
 	 * For ARM, allocate at a high address to avoid reserved
 	 * regions at low addresses that we don't know the specfics of
 	 * at the time we are processing the command line.
 	 */
 	status = efi_high_alloc(sys_table_arg, options_size, 0,
 			    &cmdline_addr, 0xfffff000);
 #else
 	status = efi_low_alloc(sys_table_arg, options_size, 0,
 			    &cmdline_addr);
 #endif
 	if (status != EFI_SUCCESS)
 		return NULL;

 	s1 = (u8 *)cmdline_addr;
 	s2 = (u16 *)options;

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

 	*s1 = '\0';

 	*cmd_line_len = options_size;
 	return (char *)cmdline_addr;
 }
	/*
	* Helper functions used by the EFI stub on multiple
	* architectures. This should be #included by the EFI stub
	* implementation files.
	*
	* 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.
	*
	*/
	#define EFI_READ_CHUNK_SIZE (1024 * 1024)

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




	static void efi_char16_printk(efi_system_table_t *sys_table_arg,
	efi_char16_t *str)
	{
	struct efi_simple_text_output_protocol *out;

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

	static void efi_printk(efi_system_table_t sys_table_arg, char str)
	{
	char *s8;

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

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

	efi_char16_printk(sys_table_arg, ch);
	}
	}


	static efi_status_t efi_get_memory_map(efi_system_table_t *sys_table_arg,
	efi_memory_desc_t **map,
	unsigned long *map_size,
	unsigned long *desc_size,
	u32 *desc_ver,
	unsigned long *key_ptr)
	{
	efi_memory_desc_t *m = NULL;
	efi_status_t status;
	unsigned long key;
	u32 desc_version;

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

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

	if (status != EFI_SUCCESS)
	efi_call_phys1(sys_table_arg->boottime->free_pool, m);
	if (key_ptr && status == EFI_SUCCESS)
	*key_ptr = key;
	if (desc_ver && status == EFI_SUCCESS)
	*desc_ver = desc_version;

	fail:
	*map = m;
	return status;
	}

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

	status = efi_get_memory_map(sys_table_arg, &map, &map_size, &desc_size,
	NULL, NULL);
	if (status != EFI_SUCCESS)
	goto fail;

	/*
	* Enforce minimum alignment that EFI requires when requesting
	* a specific address. We are doing page-based allocations,
	* so we must be aligned to a page.
	*/
	if (align < EFI_PAGE_SIZE)
	align = EFI_PAGE_SIZE;

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

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

	if (desc->num_pages < nr_pages)
	continue;

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

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

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

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

	start = round_down(end - size, align);

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

	if (start > max_addr)
	max_addr = start;
	}

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

	*addr = max_addr;
	}

	efi_call_phys1(sys_table_arg->boottime->free_pool, map);

	fail:
	return status;
	}

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

	status = efi_get_memory_map(sys_table_arg, &map, &map_size, &desc_size,
	NULL, NULL);
	if (status != EFI_SUCCESS)
	goto fail;

	/*
	* Enforce minimum alignment that EFI requires when requesting
	* a specific address. We are doing page-based allocations,
	* so we must be aligned to a page.
	*/
	if (align < EFI_PAGE_SIZE)
	align = EFI_PAGE_SIZE;

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

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

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

	if (desc->num_pages < nr_pages)
	continue;

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

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

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

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

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

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

	static void efi_free(efi_system_table_t *sys_table_arg, unsigned long size,
	unsigned long addr)
	{
	unsigned long nr_pages;

	if (!size)
	return;

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


	/*
	* Check the cmdline for a LILO-style file= arguments.
	*
	* We only support loading a file from the same filesystem as
	* the kernel image.
	*/
	static efi_status_t handle_cmdline_files(efi_system_table_t *sys_table_arg,
	efi_loaded_image_t *image,
	char cmd_line, char option_string,
	unsigned long max_addr,
	unsigned long *load_addr,
	unsigned long *load_size)
	{
	struct file_info *files;
	unsigned long file_addr;
	efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
	u64 file_size_total;
	efi_file_io_interface_t *io;
	efi_file_handle_t *fh;
	efi_status_t status;
	int nr_files;
	char *str;
	int i, j, k;

	file_addr = 0;
	file_size_total = 0;

	str = cmd_line;

	j = 0; /* See close_handles */

	if (!load_addr \|\| !load_size)
	return EFI_INVALID_PARAMETER;

	*load_addr = 0;
	*load_size = 0;

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

	for (nr_files = 0; *str; nr_files++) {
	str = strstr(str, option_string);
	if (!str)
	break;

	str += strlen(option_string);

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

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

	if (!nr_files)
	return EFI_SUCCESS;

	status = efi_call_phys3(sys_table_arg->boottime->allocate_pool,
	EFI_LOADER_DATA,
	nr_files * sizeof(*files),
	(void **)&files);
	if (status != EFI_SUCCESS) {
	efi_printk(sys_table_arg, "Failed to alloc mem for file handle list\n");
	goto fail;
	}

	str = cmd_line;
	for (i = 0; i < nr_files; i++) {
	struct file_info *file;
	efi_file_handle_t *h;
	efi_file_info_t *info;
	efi_char16_t filename_16[256];
	unsigned long info_sz;
	efi_guid_t info_guid = EFI_FILE_INFO_ID;
	efi_char16_t *p;
	u64 file_sz;

	str = strstr(str, option_string);
	if (!str)
	break;

	str += strlen(option_string);

	file = &files[i];
	p = filename_16;

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

	while (str && str != ' ' && *str != '\n') {
	if ((u8 )p >= (u8 )filename_16 + sizeof(filename_16))
	break;

	if (*str == '/') {
	*p++ = '\\';
	str++;
	} else {
	p++ = str++;
	}
	}

	*p = '\0';

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

	boottime = sys_table_arg->boottime;

	status = efi_call_phys3(boottime->handle_protocol,
	image->device_handle, &fs_proto,
	(void **)&io);
	if (status != EFI_SUCCESS) {
	efi_printk(sys_table_arg, "Failed to handle fs_proto\n");
	goto free_files;
	}

	status = efi_call_phys2(io->open_volume, io, &fh);
	if (status != EFI_SUCCESS) {
	efi_printk(sys_table_arg, "Failed to open volume\n");
	goto free_files;
	}
	}

	status = efi_call_phys5(fh->open, fh, &h, filename_16,
	EFI_FILE_MODE_READ, (u64)0);
	if (status != EFI_SUCCESS) {
	efi_printk(sys_table_arg, "Failed to open file: ");
	efi_char16_printk(sys_table_arg, filename_16);
	efi_printk(sys_table_arg, "\n");
	goto close_handles;
	}

	file->handle = h;

	info_sz = 0;
	status = efi_call_phys4(h->get_info, h, &info_guid,
	&info_sz, NULL);
	if (status != EFI_BUFFER_TOO_SMALL) {
	efi_printk(sys_table_arg, "Failed to get file info size\n");
	goto close_handles;
	}

	grow:
	status = efi_call_phys3(sys_table_arg->boottime->allocate_pool,
	EFI_LOADER_DATA, info_sz,
	(void **)&info);
	if (status != EFI_SUCCESS) {
	efi_printk(sys_table_arg, "Failed to alloc mem for file info\n");
	goto close_handles;
	}

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

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

	if (status != EFI_SUCCESS) {
	efi_printk(sys_table_arg, "Failed to get file info\n");
	goto close_handles;
	}

	file->size = file_sz;
	file_size_total += file_sz;
	}

	if (file_size_total) {
	unsigned long addr;

	/*
	* Multiple files need to be at consecutive addresses in memory,
	* so allocate enough memory for all the files. This is used
	* for loading multiple files.
	*/
	status = efi_high_alloc(sys_table_arg, file_size_total, 0x1000,
	&file_addr, max_addr);
	if (status != EFI_SUCCESS) {
	efi_printk(sys_table_arg, "Failed to alloc highmem for files\n");
	goto close_handles;
	}

	/* We've run out of free low memory. */
	if (file_addr > max_addr) {
	efi_printk(sys_table_arg, "We've run out of free low memory\n");
	status = EFI_INVALID_PARAMETER;
	goto free_file_total;
	}

	addr = file_addr;
	for (j = 0; j < nr_files; j++) {
	unsigned long size;

	size = files[j].size;
	while (size) {
	unsigned long chunksize;
	if (size > EFI_READ_CHUNK_SIZE)
	chunksize = EFI_READ_CHUNK_SIZE;
	else
	chunksize = size;
	status = efi_call_phys3(fh->read,
	files[j].handle,
	&chunksize,
	(void *)addr);
	if (status != EFI_SUCCESS) {
	efi_printk(sys_table_arg, "Failed to read file\n");
	goto free_file_total;
	}
	addr += chunksize;
	size -= chunksize;
	}

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

	}

	efi_call_phys1(sys_table_arg->boottime->free_pool, files);

	*load_addr = file_addr;
	*load_size = file_size_total;

	return status;

	free_file_total:
	efi_free(sys_table_arg, file_size_total, file_addr);

	close_handles:
	for (k = j; k < i; k++)
	efi_call_phys1(fh->close, files[k].handle);
	free_files:
	efi_call_phys1(sys_table_arg->boottime->free_pool, files);
	fail:
	*load_addr = 0;
	*load_size = 0;

	return status;
	}
	/*
	* Relocate a kernel image, either compressed or uncompressed.
	* In the ARM64 case, all kernel images are currently
	* uncompressed, and as such when we relocate it we need to
	* allocate additional space for the BSS segment. Any low
	* memory that this function should avoid needs to be
	* unavailable in the EFI memory map, as if the preferred
	* address is not available the lowest available address will
	* be used.
	*/
	static efi_status_t efi_relocate_kernel(efi_system_table_t *sys_table_arg,
	unsigned long *image_addr,
	unsigned long image_size,
	unsigned long alloc_size,
	unsigned long preferred_addr,
	unsigned long alignment)
	{
	unsigned long cur_image_addr;
	unsigned long new_addr = 0;
	efi_status_t status;
	unsigned long nr_pages;
	efi_physical_addr_t efi_addr = preferred_addr;

	if (!image_addr \|\| !image_size \|\| !alloc_size)
	return EFI_INVALID_PARAMETER;
	if (alloc_size < image_size)
	return EFI_INVALID_PARAMETER;

	cur_image_addr = *image_addr;

	/*
	* The EFI firmware loader could have placed the kernel image
	* anywhere in memory, but the kernel has restrictions on the
	* max physical address it can run at. Some architectures
	* also have a prefered address, so first try to relocate
	* to the preferred address. If that fails, allocate as low
	* as possible while respecting the required alignment.
	*/
	nr_pages = round_up(alloc_size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
	status = efi_call_phys4(sys_table_arg->boottime->allocate_pages,
	EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
	nr_pages, &efi_addr);
	new_addr = efi_addr;
	/*
	* If preferred address allocation failed allocate as low as
	* possible.
	*/
	if (status != EFI_SUCCESS) {
	status = efi_low_alloc(sys_table_arg, alloc_size, alignment,
	&new_addr);
	}
	if (status != EFI_SUCCESS) {
	efi_printk(sys_table_arg, "ERROR: Failed to allocate usable memory for kernel.\n");
	return status;
	}

	/*
	* We know source/dest won't overlap since both memory ranges
	* have been allocated by UEFI, so we can safely use memcpy.
	*/
	memcpy((void )new_addr, (void )cur_image_addr, image_size);

	/* Return the new address of the relocated image. */
	*image_addr = new_addr;

	return status;
	}

	/*
	* Convert the unicode UEFI command line to ASCII to pass to kernel.
	* Size of memory allocated return in *cmd_line_len.
	* Returns NULL on error.
	*/
	static char efi_convert_cmdline_to_ascii(efi_system_table_t sys_table_arg,
	efi_loaded_image_t *image,
	int *cmd_line_len)
	{
	u16 *s2;
	u8 *s1 = NULL;
	unsigned long cmdline_addr = 0;
	int load_options_size = image->load_options_size / 2; /* ASCII */
	void *options = image->load_options;
	int options_size = 0;
	efi_status_t status;
	int i;
	u16 zero = 0;

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

	if (options_size == 0) {
	/* No command line options, so return empty string*/
	options_size = 1;
	options = &zero;
	}

	options_size++; /* NUL termination */
	#ifdef CONFIG_ARM
	/*
	* For ARM, allocate at a high address to avoid reserved
	* regions at low addresses that we don't know the specfics of
	* at the time we are processing the command line.
	*/
	status = efi_high_alloc(sys_table_arg, options_size, 0,
	&cmdline_addr, 0xfffff000);
	#else
	status = efi_low_alloc(sys_table_arg, options_size, 0,
	&cmdline_addr);
	#endif
	if (status != EFI_SUCCESS)
	return NULL;

	s1 = (u8 *)cmdline_addr;
	s2 = (u16 *)options;

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

	*s1 = '\0';

	*cmd_line_len = options_size;
	return (char *)cmdline_addr;
	}