lib/efi/efi_app.c - platform/external/u-boot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (c) 2015 Google, Inc
  *
  * EFI information obtained here:
  * http://wiki.phoenix.com/wiki/index.php/EFI_BOOT_SERVICES
  *
  * This file implements U-Boot running as an EFI application.
  */

 #include <common.h>
 #include <cpu_func.h>
 #include <debug_uart.h>
 #include <dm.h>
 #include <errno.h>
 #include <init.h>
 #include <malloc.h>
 #include <asm/global_data.h>
 #include <linux/err.h>
 #include <linux/types.h>
 #include <efi.h>
 #include <efi_api.h>
 #include <sysreset.h>
 #include <dm/device-internal.h>
 #include <dm/lists.h>
 #include <dm/root.h>

 DECLARE_GLOBAL_DATA_PTR;

 int efi_info_get(enum efi_entry_t type, void **datap, int *sizep)
 {
 	return -ENOSYS;
 }

 int efi_get_mmap(struct efi_mem_desc **descp, int *sizep, uint *keyp,
 		 int *desc_sizep, uint *versionp)
 {
 	struct efi_priv *priv = efi_get_priv();
 	struct efi_boot_services *boot = priv->sys_table->boottime;
 	efi_uintn_t size, desc_size, key;
 	struct efi_mem_desc *desc;
 	efi_status_t ret;
 	u32 version;

 	/* Get the memory map so we can switch off EFI */
 	size = 0;
 	ret = boot->get_memory_map(&size, NULL, &key, &desc_size, &version);
 	if (ret != EFI_BUFFER_TOO_SMALL)
 		return log_msg_ret("get", -ENOMEM);

 	desc = malloc(size);
 	if (!desc)
 		return log_msg_ret("mem", -ENOMEM);

 	ret = boot->get_memory_map(&size, desc, &key, &desc_size, &version);
 	if (ret)
 		return log_msg_ret("get", -EINVAL);

 	*descp = desc;
 	*sizep = size;
 	*desc_sizep = desc_size;
 	*versionp = version;
 	*keyp = key;

 	return 0;
 }

 /**
  * efi_bind_block() - bind a new block device to an EFI device
  *
  * Binds a new top-level EFI_MEDIA device as well as a child block device so
  * that the block device can be accessed in U-Boot.
  *
  * The device can then be accessed using 'part list efi 0', 'fat ls efi 0:1',
  * for example, just like any other interface type.
  *
  * @handle: handle of the controller on which this driver is installed
  * @blkio: block io protocol proxied by this driver
  * @device_path: EFI device path structure for this
  * @len: Length of @device_path in bytes
  * @devp: Returns the bound device
  * Return: 0 if OK, -ve on error
  */
 int efi_bind_block(efi_handle_t handle, struct efi_block_io *blkio,
 		   struct efi_device_path *device_path, int len,
 		   struct udevice **devp)
 {
 	struct efi_media_plat plat;
 	struct udevice *dev;
 	char name[18];
 	int ret;

 	plat.handle = handle;
 	plat.blkio = blkio;
 	plat.device_path = malloc(device_path->length);
 	if (!plat.device_path)
 		return log_msg_ret("path", -ENOMEM);
 	memcpy(plat.device_path, device_path, device_path->length);
 	ret = device_bind(dm_root(), DM_DRIVER_GET(efi_media), "efi_media",
 			  &plat, ofnode_null(), &dev);
 	if (ret)
 		return log_msg_ret("bind", ret);

 	snprintf(name, sizeof(name), "efi_media_%x", dev_seq(dev));
 	device_set_name(dev, name);
 	*devp = dev;

 	return 0;
 }

 static efi_status_t setup_memory(struct efi_priv *priv)
 {
 	struct efi_boot_services *boot = priv->boot;
 	efi_physical_addr_t addr;
 	efi_status_t ret;
 	int pages;

 	/*
 	 * Use global_data_ptr instead of gd since it is an assignment. There
 	 * are very few assignments to global_data in U-Boot and this makes
 	 * it easier to find them.
 	 */
 	global_data_ptr = efi_malloc(priv, sizeof(struct global_data), &ret);
 	if (!global_data_ptr)
 		return ret;
 	memset(gd, '\0', sizeof(*gd));

 	gd->malloc_base = (ulong)efi_malloc(priv, CONFIG_VAL(SYS_MALLOC_F_LEN),
 					    &ret);
 	if (!gd->malloc_base)
 		return ret;
 	pages = CONFIG_EFI_RAM_SIZE >> 12;

 	/*
 	 * Don't allocate any memory above 4GB. U-Boot is a 32-bit application
 	 * so we want it to load below 4GB.
 	 */
 	addr = 1ULL << 32;
 	ret = boot->allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
 				   priv->image_data_type, pages, &addr);
 	if (ret) {
 		log_info("(using pool %lx) ", ret);
 		priv->ram_base = (ulong)efi_malloc(priv, CONFIG_EFI_RAM_SIZE,
 						   &ret);
 		if (!priv->ram_base)
 			return ret;
 		priv->use_pool_for_malloc = true;
 	} else {
 		log_info("(using allocated RAM address %lx) ", (ulong)addr);
 		priv->ram_base = addr;
 	}
 	gd->ram_size = pages << 12;

 	return 0;
 }

 /**
  * free_memory() - Free memory used by the U-Boot app
  *
  * This frees memory allocated in setup_memory(), in preparation for returning
  * to UEFI. It also zeroes the global_data pointer.
  *
  * @priv: Private EFI data
  */
 static void free_memory(struct efi_priv *priv)
 {
 	struct efi_boot_services *boot = priv->boot;

 	if (priv->use_pool_for_malloc)
 		efi_free(priv, (void *)priv->ram_base);
 	else
 		boot->free_pages(priv->ram_base, gd->ram_size >> 12);

 	efi_free(priv, (void *)gd->malloc_base);
 	efi_free(priv, gd);
 	global_data_ptr = NULL;
 }

 /**
  * devpath_is_partition() - Figure out if a device path is a partition
  *
  * Checks if a device path refers to a partition on some media device. This
  * works by checking for a valid partition number in a hard-driver media device
  * as the final component of the device path.
  *
  * @path:	device path
  * Return:	true if a partition, false if not
  *		(e.g. it might be media which contains partitions)
  */
 static bool devpath_is_partition(const struct efi_device_path *path)
 {
 	const struct efi_device_path *p;
 	bool was_part = false;

 	for (p = path; p->type != DEVICE_PATH_TYPE_END;
 	     p = (void *)p + p->length) {
 		was_part = false;
 		if (p->type == DEVICE_PATH_TYPE_MEDIA_DEVICE &&
 		    p->sub_type == DEVICE_PATH_SUB_TYPE_HARD_DRIVE_PATH) {
 			struct efi_device_path_hard_drive_path *hd =
 				(void *)path;

 			if (hd->partition_number)
 				was_part = true;
 		}
 	}

 	return was_part;
 }

 /**
  * setup_block() - Find all block devices and setup EFI devices for them
  *
  * Partitions are ignored, since U-Boot has partition handling. Errors with
  * particular devices produce a warning but execution continues to try to
  * find others.
  *
  * Return: 0 if found, -ENOSYS if there is no boot-services table, -ENOTSUPP
  *	if a required protocol is not supported
  */
 static int setup_block(void)
 {
 	efi_guid_t efi_blkio_guid = EFI_BLOCK_IO_PROTOCOL_GUID;
 	efi_guid_t efi_devpath_guid = EFI_DEVICE_PATH_PROTOCOL_GUID;
 	efi_guid_t efi_pathutil_guid = EFI_DEVICE_PATH_UTILITIES_PROTOCOL_GUID;
 	efi_guid_t efi_pathtext_guid = EFI_DEVICE_PATH_TO_TEXT_PROTOCOL_GUID;
 	struct efi_boot_services *boot = efi_get_boot();
 	struct efi_device_path_utilities_protocol *util;
 	struct efi_device_path_to_text_protocol *text;
 	struct efi_device_path *path;
 	struct efi_block_io *blkio;
 	efi_uintn_t num_handles;
 	efi_handle_t *handle;
 	int ret, i;

 	if (!boot)
 		return log_msg_ret("sys", -ENOSYS);

 	/* Find all devices which support the block I/O protocol */
 	ret = boot->locate_handle_buffer(BY_PROTOCOL, &efi_blkio_guid, NULL,
 				  &num_handles, &handle);
 	if (ret)
 		return log_msg_ret("loc", -ENOTSUPP);
 	log_debug("Found %d handles:\n", (int)num_handles);

 	/* We need to look up the path size and convert it to text */
 	ret = boot->locate_protocol(&efi_pathutil_guid, NULL, (void **)&util);
 	if (ret)
 		return log_msg_ret("util", -ENOTSUPP);
 	ret = boot->locate_protocol(&efi_pathtext_guid, NULL, (void **)&text);
 	if (ret)
 		return log_msg_ret("text", -ENOTSUPP);

 	for (i = 0; i < num_handles; i++) {
 		struct udevice *dev;
 		const u16 *name;
 		bool is_part;
 		int len;

 		ret = boot->handle_protocol(handle[i], &efi_devpath_guid,
 					    (void **)&path);
 		if (ret) {
 			log_warning("- devpath %d failed (ret=%d)\n", i, ret);
 			continue;
 		}

 		ret = boot->handle_protocol(handle[i], &efi_blkio_guid,
 					    (void **)&blkio);
 		if (ret) {
 			log_warning("- blkio %d failed (ret=%d)\n", i, ret);
 			continue;
 		}

 		name = text->convert_device_path_to_text(path, true, false);
 		is_part = devpath_is_partition(path);

 		if (!is_part) {
 			len = util->get_device_path_size(path);
 			ret = efi_bind_block(handle[i], blkio, path, len, &dev);
 			if (ret) {
 				log_warning("- blkio bind %d failed (ret=%d)\n",
 					    i, ret);
 				continue;
 			}
 		} else {
 			dev = NULL;
 		}

 		/*
 		 * Show the device name if we created one. Otherwise indicate
 		 * that it is a partition.
 		 */
 		printf("%2d: %-12s %ls\n", i, dev ? dev->name : "<partition>",
 		       name);
 	}
 	boot->free_pool(handle);

 	return 0;
 }

 /**
  * dm_scan_other() - Scan for UEFI devices that should be available to U-Boot
  *
  * This sets up block devices within U-Boot for those found in UEFI. With this,
  * U-Boot can access those devices
  *
  * @pre_reloc_only: true to only bind pre-relocation devices (ignored)
  * Returns: 0 on success, -ve on error
  */
 int dm_scan_other(bool pre_reloc_only)
 {
 	if (gd->flags & GD_FLG_RELOC) {
 		int ret;

 		ret = setup_block();
 		if (ret)
 			return ret;
 	}

 	return 0;
 }

 /**
  * efi_main() - Start an EFI image
  *
  * This function is called by our EFI start-up code. It handles running
  * U-Boot. If it returns, EFI will continue. Another way to get back to EFI
  * is via reset_cpu().
  */
 efi_status_t EFIAPI efi_main(efi_handle_t image,
 			     struct efi_system_table *sys_table)
 {
 	struct efi_priv local_priv, *priv = &local_priv;
 	efi_status_t ret;

 	/* Set up access to EFI data structures */
 	ret = efi_init(priv, "App", image, sys_table);
 	if (ret) {
 		printf("Failed to set up U-Boot: err=%lx\n", ret);
 		return ret;
 	}
 	efi_set_priv(priv);

 	/*
 	 * Set up the EFI debug UART so that printf() works. This is
 	 * implemented in the EFI serial driver, serial_efi.c. The application
 	 * can use printf() freely.
 	 */
 	debug_uart_init();

 	ret = setup_memory(priv);
 	if (ret) {
 		printf("Failed to set up memory: ret=%lx\n", ret);
 		return ret;
 	}

 	/*
 	 * We could store the EFI memory map here, but it changes all the time,
 	 * so this is only useful for debugging.
 	 *
 	 * ret = efi_store_memory_map(priv);
 	 * if (ret)
 	 *	return ret;
 	 */

 	printf("starting\n");

 	board_init_f(GD_FLG_SKIP_RELOC);
 	board_init_r(NULL, 0);
 	free_memory(priv);

 	return EFI_SUCCESS;
 }

 static void efi_exit(void)
 {
 	struct efi_priv *priv = efi_get_priv();

 	free_memory(priv);
 	printf("U-Boot EFI exiting\n");
 	priv->boot->exit(priv->parent_image, EFI_SUCCESS, 0, NULL);
 }

 static int efi_sysreset_request(struct udevice *dev, enum sysreset_t type)
 {
 	efi_exit();

 	return -EINPROGRESS;
 }

 static const struct udevice_id efi_sysreset_ids[] = {
 	{ .compatible = "efi,reset" },
 	{ }
 };

 static struct sysreset_ops efi_sysreset_ops = {
 	.request = efi_sysreset_request,
 };

 U_BOOT_DRIVER(efi_sysreset) = {
 	.name = "efi-sysreset",
 	.id = UCLASS_SYSRESET,
 	.of_match = efi_sysreset_ids,
 	.ops = &efi_sysreset_ops,
 };
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Copyright (c) 2015 Google, Inc
	*
	* EFI information obtained here:
	* http://wiki.phoenix.com/wiki/index.php/EFI_BOOT_SERVICES
	*
	* This file implements U-Boot running as an EFI application.
	*/

	#include <common.h>
	#include <cpu_func.h>
	#include <debug_uart.h>
	#include <dm.h>
	#include <errno.h>
	#include <init.h>
	#include <malloc.h>
	#include <asm/global_data.h>
	#include <linux/err.h>
	#include <linux/types.h>
	#include <efi.h>
	#include <efi_api.h>
	#include <sysreset.h>
	#include <dm/device-internal.h>
	#include <dm/lists.h>
	#include <dm/root.h>

	DECLARE_GLOBAL_DATA_PTR;

	int efi_info_get(enum efi_entry_t type, void *datap, int sizep)
	{
	return -ENOSYS;
	}

	int efi_get_mmap(struct efi_mem_desc *descp, int sizep, uint *keyp,
	int desc_sizep, uint versionp)
	{
	struct efi_priv *priv = efi_get_priv();
	struct efi_boot_services *boot = priv->sys_table->boottime;
	efi_uintn_t size, desc_size, key;
	struct efi_mem_desc *desc;
	efi_status_t ret;
	u32 version;

	/* Get the memory map so we can switch off EFI */
	size = 0;
	ret = boot->get_memory_map(&size, NULL, &key, &desc_size, &version);
	if (ret != EFI_BUFFER_TOO_SMALL)
	return log_msg_ret("get", -ENOMEM);

	desc = malloc(size);
	if (!desc)
	return log_msg_ret("mem", -ENOMEM);

	ret = boot->get_memory_map(&size, desc, &key, &desc_size, &version);
	if (ret)
	return log_msg_ret("get", -EINVAL);

	*descp = desc;
	*sizep = size;
	*desc_sizep = desc_size;
	*versionp = version;
	*keyp = key;

	return 0;
	}

	/**
	* efi_bind_block() - bind a new block device to an EFI device
	*
	* Binds a new top-level EFI_MEDIA device as well as a child block device so
	* that the block device can be accessed in U-Boot.
	*
	* The device can then be accessed using 'part list efi 0', 'fat ls efi 0:1',
	* for example, just like any other interface type.
	*
	* @handle: handle of the controller on which this driver is installed
	* @blkio: block io protocol proxied by this driver
	* @device_path: EFI device path structure for this
	* @len: Length of @device_path in bytes
	* @devp: Returns the bound device
	* Return: 0 if OK, -ve on error
	*/
	int efi_bind_block(efi_handle_t handle, struct efi_block_io *blkio,
	struct efi_device_path *device_path, int len,
	struct udevice **devp)
	{
	struct efi_media_plat plat;
	struct udevice *dev;
	char name[18];
	int ret;

	plat.handle = handle;
	plat.blkio = blkio;
	plat.device_path = malloc(device_path->length);
	if (!plat.device_path)
	return log_msg_ret("path", -ENOMEM);
	memcpy(plat.device_path, device_path, device_path->length);
	ret = device_bind(dm_root(), DM_DRIVER_GET(efi_media), "efi_media",
	&plat, ofnode_null(), &dev);
	if (ret)
	return log_msg_ret("bind", ret);

	snprintf(name, sizeof(name), "efi_media_%x", dev_seq(dev));
	device_set_name(dev, name);
	*devp = dev;

	return 0;
	}

	static efi_status_t setup_memory(struct efi_priv *priv)
	{
	struct efi_boot_services *boot = priv->boot;
	efi_physical_addr_t addr;
	efi_status_t ret;
	int pages;

	/*
	* Use global_data_ptr instead of gd since it is an assignment. There
	* are very few assignments to global_data in U-Boot and this makes
	* it easier to find them.
	*/
	global_data_ptr = efi_malloc(priv, sizeof(struct global_data), &ret);
	if (!global_data_ptr)
	return ret;
	memset(gd, '\0', sizeof(*gd));

	gd->malloc_base = (ulong)efi_malloc(priv, CONFIG_VAL(SYS_MALLOC_F_LEN),
	&ret);
	if (!gd->malloc_base)
	return ret;
	pages = CONFIG_EFI_RAM_SIZE >> 12;

	/*
	* Don't allocate any memory above 4GB. U-Boot is a 32-bit application
	* so we want it to load below 4GB.
	*/
	addr = 1ULL << 32;
	ret = boot->allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
	priv->image_data_type, pages, &addr);
	if (ret) {
	log_info("(using pool %lx) ", ret);
	priv->ram_base = (ulong)efi_malloc(priv, CONFIG_EFI_RAM_SIZE,
	&ret);
	if (!priv->ram_base)
	return ret;
	priv->use_pool_for_malloc = true;
	} else {
	log_info("(using allocated RAM address %lx) ", (ulong)addr);
	priv->ram_base = addr;
	}
	gd->ram_size = pages << 12;

	return 0;
	}

	/**
	* free_memory() - Free memory used by the U-Boot app
	*
	* This frees memory allocated in setup_memory(), in preparation for returning
	* to UEFI. It also zeroes the global_data pointer.
	*
	* @priv: Private EFI data
	*/
	static void free_memory(struct efi_priv *priv)
	{
	struct efi_boot_services *boot = priv->boot;

	if (priv->use_pool_for_malloc)
	efi_free(priv, (void *)priv->ram_base);
	else
	boot->free_pages(priv->ram_base, gd->ram_size >> 12);

	efi_free(priv, (void *)gd->malloc_base);
	efi_free(priv, gd);
	global_data_ptr = NULL;
	}

	/**
	* devpath_is_partition() - Figure out if a device path is a partition
	*
	* Checks if a device path refers to a partition on some media device. This
	* works by checking for a valid partition number in a hard-driver media device
	* as the final component of the device path.
	*
	* @path: device path
	* Return: true if a partition, false if not
	* (e.g. it might be media which contains partitions)
	*/
	static bool devpath_is_partition(const struct efi_device_path *path)
	{
	const struct efi_device_path *p;
	bool was_part = false;

	for (p = path; p->type != DEVICE_PATH_TYPE_END;
	p = (void *)p + p->length) {
	was_part = false;
	if (p->type == DEVICE_PATH_TYPE_MEDIA_DEVICE &&
	p->sub_type == DEVICE_PATH_SUB_TYPE_HARD_DRIVE_PATH) {
	struct efi_device_path_hard_drive_path *hd =
	(void *)path;

	if (hd->partition_number)
	was_part = true;
	}
	}

	return was_part;
	}

	/**
	* setup_block() - Find all block devices and setup EFI devices for them
	*
	* Partitions are ignored, since U-Boot has partition handling. Errors with
	* particular devices produce a warning but execution continues to try to
	* find others.
	*
	* Return: 0 if found, -ENOSYS if there is no boot-services table, -ENOTSUPP
	* if a required protocol is not supported
	*/
	static int setup_block(void)
	{
	efi_guid_t efi_blkio_guid = EFI_BLOCK_IO_PROTOCOL_GUID;
	efi_guid_t efi_devpath_guid = EFI_DEVICE_PATH_PROTOCOL_GUID;
	efi_guid_t efi_pathutil_guid = EFI_DEVICE_PATH_UTILITIES_PROTOCOL_GUID;
	efi_guid_t efi_pathtext_guid = EFI_DEVICE_PATH_TO_TEXT_PROTOCOL_GUID;
	struct efi_boot_services *boot = efi_get_boot();
	struct efi_device_path_utilities_protocol *util;
	struct efi_device_path_to_text_protocol *text;
	struct efi_device_path *path;
	struct efi_block_io *blkio;
	efi_uintn_t num_handles;
	efi_handle_t *handle;
	int ret, i;

	if (!boot)
	return log_msg_ret("sys", -ENOSYS);

	/* Find all devices which support the block I/O protocol */
	ret = boot->locate_handle_buffer(BY_PROTOCOL, &efi_blkio_guid, NULL,
	&num_handles, &handle);
	if (ret)
	return log_msg_ret("loc", -ENOTSUPP);
	log_debug("Found %d handles:\n", (int)num_handles);

	/* We need to look up the path size and convert it to text */
	ret = boot->locate_protocol(&efi_pathutil_guid, NULL, (void **)&util);
	if (ret)
	return log_msg_ret("util", -ENOTSUPP);
	ret = boot->locate_protocol(&efi_pathtext_guid, NULL, (void **)&text);
	if (ret)
	return log_msg_ret("text", -ENOTSUPP);

	for (i = 0; i < num_handles; i++) {
	struct udevice *dev;
	const u16 *name;
	bool is_part;
	int len;

	ret = boot->handle_protocol(handle[i], &efi_devpath_guid,
	(void **)&path);
	if (ret) {
	log_warning("- devpath %d failed (ret=%d)\n", i, ret);
	continue;
	}

	ret = boot->handle_protocol(handle[i], &efi_blkio_guid,
	(void **)&blkio);
	if (ret) {
	log_warning("- blkio %d failed (ret=%d)\n", i, ret);
	continue;
	}

	name = text->convert_device_path_to_text(path, true, false);
	is_part = devpath_is_partition(path);

	if (!is_part) {
	len = util->get_device_path_size(path);
	ret = efi_bind_block(handle[i], blkio, path, len, &dev);
	if (ret) {
	log_warning("- blkio bind %d failed (ret=%d)\n",
	i, ret);
	continue;
	}
	} else {
	dev = NULL;
	}

	/*
	* Show the device name if we created one. Otherwise indicate
	* that it is a partition.
	*/
	printf("%2d: %-12s %ls\n", i, dev ? dev->name : "<partition>",
	name);
	}
	boot->free_pool(handle);

	return 0;
	}

	/**
	* dm_scan_other() - Scan for UEFI devices that should be available to U-Boot
	*
	* This sets up block devices within U-Boot for those found in UEFI. With this,
	* U-Boot can access those devices
	*
	* @pre_reloc_only: true to only bind pre-relocation devices (ignored)
	* Returns: 0 on success, -ve on error
	*/
	int dm_scan_other(bool pre_reloc_only)
	{
	if (gd->flags & GD_FLG_RELOC) {
	int ret;

	ret = setup_block();
	if (ret)
	return ret;
	}

	return 0;
	}

	/**
	* efi_main() - Start an EFI image
	*
	* This function is called by our EFI start-up code. It handles running
	* U-Boot. If it returns, EFI will continue. Another way to get back to EFI
	* is via reset_cpu().
	*/
	efi_status_t EFIAPI efi_main(efi_handle_t image,
	struct efi_system_table *sys_table)
	{
	struct efi_priv local_priv, *priv = &local_priv;
	efi_status_t ret;

	/* Set up access to EFI data structures */
	ret = efi_init(priv, "App", image, sys_table);
	if (ret) {
	printf("Failed to set up U-Boot: err=%lx\n", ret);
	return ret;
	}
	efi_set_priv(priv);

	/*
	* Set up the EFI debug UART so that printf() works. This is
	* implemented in the EFI serial driver, serial_efi.c. The application
	* can use printf() freely.
	*/
	debug_uart_init();

	ret = setup_memory(priv);
	if (ret) {
	printf("Failed to set up memory: ret=%lx\n", ret);
	return ret;
	}

	/*
	* We could store the EFI memory map here, but it changes all the time,
	* so this is only useful for debugging.
	*
	* ret = efi_store_memory_map(priv);
	* if (ret)
	* return ret;
	*/

	printf("starting\n");

	board_init_f(GD_FLG_SKIP_RELOC);
	board_init_r(NULL, 0);
	free_memory(priv);

	return EFI_SUCCESS;
	}

	static void efi_exit(void)
	{
	struct efi_priv *priv = efi_get_priv();

	free_memory(priv);
	printf("U-Boot EFI exiting\n");
	priv->boot->exit(priv->parent_image, EFI_SUCCESS, 0, NULL);
	}

	static int efi_sysreset_request(struct udevice *dev, enum sysreset_t type)
	{
	efi_exit();

	return -EINPROGRESS;
	}

	static const struct udevice_id efi_sysreset_ids[] = {
	{ .compatible = "efi,reset" },
	{ }
	};

	static struct sysreset_ops efi_sysreset_ops = {
	.request = efi_sysreset_request,
	};

	U_BOOT_DRIVER(efi_sysreset) = {
	.name = "efi-sysreset",
	.id = UCLASS_SYSRESET,
	.of_match = efi_sysreset_ids,
	.ops = &efi_sysreset_ops,
	};