drivers/firmware/efi/efi-stub-helper.c - kernel/msm-4.19 - 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 initrd {
 	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 __get_map(efi_system_table_t *sys_table_arg,
 			      efi_memory_desc_t **map,
 			      unsigned long *map_size,
 			      unsigned long *desc_size)
 {
 	efi_memory_desc_t *m = NULL;
 	efi_status_t status;
 	unsigned long key;
 	u32 desc_version;

 	*map_size = sizeof(*m) * 32;
 again:
 	/*
 	 * Add an additional efi_memory_desc_t because we're doing an
 	 * allocation which may be in a new descriptor region.
 	 */
 	*map_size += sizeof(*m);
 	status = efi_call_phys3(sys_table_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);

 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 = __get_map(sys_table_arg, &map, &map_size, &desc_size);
 	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;
 	}

 free_pool:
 	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 = __get_map(sys_table_arg, &map, &map_size, &desc_size);
 	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;

 free_pool:
 	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;

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

 	initrd_addr = 0;
 	initrd_total = 0;

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

 	j = 0;			/* See close_handles */

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

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

 		str += 7;

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

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

 	if (!nr_initrds)
 		return EFI_SUCCESS;

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

 	str = (char *)(unsigned long)hdr->cmd_line_ptr;
 	for (i = 0; i < nr_initrds; i++) {
 		struct initrd *initrd;
 		efi_file_handle_t *h;
 		efi_file_info_t *info;
 		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, "initrd=");
 		if (!str)
 			break;

 		str += 7;

 		initrd = &initrds[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, &io);
 			if (status != EFI_SUCCESS) {
 				efi_printk(sys_table_arg, "Failed to handle fs_proto\n");
 				goto free_initrds;
 			}

 			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_initrds;
 			}
 		}

 		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 initrd file: ");
 			efi_char16_printk(sys_table_arg, filename_16);
 			efi_printk(sys_table_arg, "\n");
 			goto close_handles;
 		}

 		initrd->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 initrd info size\n");
 			goto close_handles;
 		}

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

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

 	if (initrd_total) {
 		unsigned long addr;

 		/*
 		 * Multiple initrd's need to be at consecutive
 		 * addresses in memory, so allocate enough memory for
 		 * all the initrd's.
 		 */
 		status = efi_high_alloc(sys_table_arg, initrd_total, 0x1000,
 				    &initrd_addr, hdr->initrd_addr_max);
 		if (status != EFI_SUCCESS) {
 			efi_printk(sys_table_arg, "Failed to alloc highmem for initrds\n");
 			goto close_handles;
 		}

 		/* We've run out of free low memory. */
 		if (initrd_addr > hdr->initrd_addr_max) {
 			efi_printk(sys_table_arg, "We've run out of free low memory\n");
 			status = EFI_INVALID_PARAMETER;
 			goto free_initrd_total;
 		}

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

 			size = initrds[j].size;
 			while (size) {
 				u64 chunksize;
 				if (size > EFI_READ_CHUNK_SIZE)
 					chunksize = EFI_READ_CHUNK_SIZE;
 				else
 					chunksize = size;
 				status = efi_call_phys3(fh->read,
 							initrds[j].handle,
 							&chunksize, addr);
 				if (status != EFI_SUCCESS) {
 					efi_printk(sys_table_arg, "Failed to read initrd\n");
 					goto free_initrd_total;
 				}
 				addr += chunksize;
 				size -= chunksize;
 			}

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

 	}

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

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

 	return status;

 free_initrd_total:
 	efi_free(sys_table_arg, initrd_total, initrd_addr);

 close_handles:
 	for (k = j; k < i; k++)
 		efi_call_phys1(fh->close, initrds[k].handle);
 free_initrds:
 	efi_call_phys1(sys_table_arg->boottime->free_pool, initrds);
 fail:
 	hdr->ramdisk_image = 0;
 	hdr->ramdisk_size = 0;

 	return status;
 }
	/*
	* 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 initrd {
	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 __get_map(efi_system_table_t *sys_table_arg,
	efi_memory_desc_t **map,
	unsigned long *map_size,
	unsigned long *desc_size)
	{
	efi_memory_desc_t *m = NULL;
	efi_status_t status;
	unsigned long key;
	u32 desc_version;

	map_size = sizeof(m) * 32;
	again:
	/*
	* Add an additional efi_memory_desc_t because we're doing an
	* allocation which may be in a new descriptor region.
	*/
	map_size += sizeof(m);
	status = efi_call_phys3(sys_table_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);

	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 = __get_map(sys_table_arg, &map, &map_size, &desc_size);
	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;
	}

	free_pool:
	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 = __get_map(sys_table_arg, &map, &map_size, &desc_size);
	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;

	free_pool:
	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;

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

	initrd_addr = 0;
	initrd_total = 0;

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

	j = 0; /* See close_handles */

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

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

	str += 7;

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

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

	if (!nr_initrds)
	return EFI_SUCCESS;

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

	str = (char *)(unsigned long)hdr->cmd_line_ptr;
	for (i = 0; i < nr_initrds; i++) {
	struct initrd *initrd;
	efi_file_handle_t *h;
	efi_file_info_t *info;
	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, "initrd=");
	if (!str)
	break;

	str += 7;

	initrd = &initrds[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, &io);
	if (status != EFI_SUCCESS) {
	efi_printk(sys_table_arg, "Failed to handle fs_proto\n");
	goto free_initrds;
	}

	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_initrds;
	}
	}

	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 initrd file: ");
	efi_char16_printk(sys_table_arg, filename_16);
	efi_printk(sys_table_arg, "\n");
	goto close_handles;
	}

	initrd->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 initrd info size\n");
	goto close_handles;
	}

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

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

	if (initrd_total) {
	unsigned long addr;

	/*
	* Multiple initrd's need to be at consecutive
	* addresses in memory, so allocate enough memory for
	* all the initrd's.
	*/
	status = efi_high_alloc(sys_table_arg, initrd_total, 0x1000,
	&initrd_addr, hdr->initrd_addr_max);
	if (status != EFI_SUCCESS) {
	efi_printk(sys_table_arg, "Failed to alloc highmem for initrds\n");
	goto close_handles;
	}

	/* We've run out of free low memory. */
	if (initrd_addr > hdr->initrd_addr_max) {
	efi_printk(sys_table_arg, "We've run out of free low memory\n");
	status = EFI_INVALID_PARAMETER;
	goto free_initrd_total;
	}

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

	size = initrds[j].size;
	while (size) {
	u64 chunksize;
	if (size > EFI_READ_CHUNK_SIZE)
	chunksize = EFI_READ_CHUNK_SIZE;
	else
	chunksize = size;
	status = efi_call_phys3(fh->read,
	initrds[j].handle,
	&chunksize, addr);
	if (status != EFI_SUCCESS) {
	efi_printk(sys_table_arg, "Failed to read initrd\n");
	goto free_initrd_total;
	}
	addr += chunksize;
	size -= chunksize;
	}

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

	}

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

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

	return status;

	free_initrd_total:
	efi_free(sys_table_arg, initrd_total, initrd_addr);

	close_handles:
	for (k = j; k < i; k++)
	efi_call_phys1(fh->close, initrds[k].handle);
	free_initrds:
	efi_call_phys1(sys_table_arg->boottime->free_pool, initrds);
	fail:
	hdr->ramdisk_image = 0;
	hdr->ramdisk_size = 0;

	return status;
	}