boot/bootmeth_efi.c - filogic/uboot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Bootmethod for distro boot via EFI
  *
  * Copyright 2021 Google LLC
  * Written by Simon Glass <sjg@chromium.org>
  */

 #define LOG_CATEGORY UCLASS_BOOTSTD

 #include <bootdev.h>
 #include <bootflow.h>
 #include <bootmeth.h>
 #include <command.h>
 #include <dm.h>
 #include <efi_default_filename.h>
 #include <efi_loader.h>
 #include <fs.h>
 #include <malloc.h>
 #include <mapmem.h>
 #include <mmc.h>
 #include <net.h>
 #include <pxe_utils.h>
 #include <linux/sizes.h>

 #define EFI_DIRNAME	"/EFI/BOOT/"

 static int get_efi_pxe_arch(void)
 {
 	/* http://www.iana.org/assignments/dhcpv6-parameters/dhcpv6-parameters.xml */
 	if (IS_ENABLED(CONFIG_ARM64))
 		return 0xb;
 	else if (IS_ENABLED(CONFIG_ARM))
 		return 0xa;
 	else if (IS_ENABLED(CONFIG_X86_64))
 		return 0x6;
 	else if (IS_ENABLED(CONFIG_X86))
 		return 0x7;
 	else if (IS_ENABLED(CONFIG_ARCH_RV32I))
 		return 0x19;
 	else if (IS_ENABLED(CONFIG_ARCH_RV64I))
 		return 0x1b;
 	else if (IS_ENABLED(CONFIG_SANDBOX))
 		return 0;	/* not used */

 	return -EINVAL;
 }

 static int get_efi_pxe_vci(char *str, int max_len)
 {
 	int ret;

 	ret = get_efi_pxe_arch();
 	if (ret < 0)
 		return ret;

 	snprintf(str, max_len, "PXEClient:Arch:%05x:UNDI:003000", ret);

 	return 0;
 }

 /**
  * bootmeth_uses_network() - check if the media device is Ethernet
  *
  * @bflow: Bootflow to check
  * Returns: true if the media device is Ethernet, else false
  */
 static bool bootmeth_uses_network(struct bootflow *bflow)
 {
 	const struct udevice *media = dev_get_parent(bflow->dev);

 	return IS_ENABLED(CONFIG_CMD_DHCP) &&
 	    device_get_uclass_id(media) == UCLASS_ETH;
 }

 static void set_efi_bootdev(struct blk_desc *desc, struct bootflow *bflow)
 {
 	const struct udevice *media_dev;
 	int size = bflow->size;
 	const char *dev_name;
 	char devnum_str[9];
 	char dirname[200];
 	char *last_slash;

 	/*
 	 * This is a horrible hack to tell EFI about this boot device. Once we
 	 * unify EFI with the rest of U-Boot we can clean this up. The same hack
 	 * exists in multiple places, e.g. in the fs, tftp and load commands.
 	 *
 	 * Once we can clean up the EFI code to make proper use of driver model,
 	 * this can go away.
 	 */
 	media_dev = dev_get_parent(bflow->dev);
 	snprintf(devnum_str, sizeof(devnum_str), "%x:%x",
 		 desc ? desc->devnum : dev_seq(media_dev),
 		 bflow->part);

 	strlcpy(dirname, bflow->fname, sizeof(dirname));
 	last_slash = strrchr(dirname, '/');
 	if (last_slash)
 		*last_slash = '\0';

 	dev_name = device_get_uclass_id(media_dev) == UCLASS_MASS_STORAGE ?
 		 "usb" : blk_get_uclass_name(device_get_uclass_id(media_dev));
 	log_debug("setting bootdev %s, %s, %s, %p, %x\n",
 		  dev_name, devnum_str, bflow->fname, bflow->buf, size);
 	efi_set_bootdev(dev_name, devnum_str, bflow->fname, bflow->buf, size);
 }

 static int efiload_read_file(struct bootflow *bflow, ulong addr)
 {
 	struct blk_desc *desc = NULL;
 	loff_t bytes_read;
 	int ret;

 	if (bflow->blk)
 		 desc = dev_get_uclass_plat(bflow->blk);
 	ret = bootmeth_setup_fs(bflow, desc);
 	if (ret)
 		return log_msg_ret("set", ret);

 	ret = fs_read(bflow->fname, addr, 0, bflow->size, &bytes_read);
 	if (ret)
 		return log_msg_ret("read", ret);
 	bflow->buf = map_sysmem(addr, bflow->size);

 	set_efi_bootdev(desc, bflow);

 	return 0;
 }

 static int distro_efi_check(struct udevice *dev, struct bootflow_iter *iter)
 {
 	/* This only works on block and network devices */
 	if (bootflow_iter_check_blk(iter) && bootflow_iter_check_net(iter))
 		return log_msg_ret("blk", -ENOTSUPP);

 	/* This works on block devices and network devices */
 	if (iter->method_flags & BOOTFLOW_METHF_PXE_ONLY)
 		return log_msg_ret("pxe", -ENOTSUPP);

 	return 0;
 }

 /*
  * distro_efi_try_bootflow_files() - Check that files are present
  *
  * This reads any FDT file and checks whether the bootflow file is present, for
  * later reading. We avoid reading the bootflow now, since it is likely large,
  * it may take a long time and we want to avoid needing to allocate memory for
  * it
  *
  * @dev: bootmeth device to use
  * @bflow: bootflow to update
  */
 static int distro_efi_try_bootflow_files(struct udevice *dev,
 					 struct bootflow *bflow)
 {
 	struct blk_desc *desc = NULL;
 	ulong fdt_addr, size;
 	char fname[256];
 	int ret, seq;

 	/* We require a partition table */
 	if (!bflow->part) {
 		log_debug("no partitions\n");
 		return -ENOENT;
 	}

 	strcpy(fname, EFI_DIRNAME);
 	strcat(fname, BOOTEFI_NAME);

 	if (bflow->blk)
 		 desc = dev_get_uclass_plat(bflow->blk);
 	ret = bootmeth_try_file(bflow, desc, NULL, fname);
 	if (ret) {
 		log_debug("File '%s' not found\n", fname);
 		return log_msg_ret("try", ret);
 	}

 	/* Since we can access the file, let's call it ready */
 	bflow->state = BOOTFLOWST_READY;

 	fdt_addr = env_get_hex("fdt_addr_r", 0);

 	/* try the various available names */
 	ret = -ENOENT;
 	*fname = '\0';
 	for (seq = 0; ret == -ENOENT; seq++) {
 		ret = efi_get_distro_fdt_name(fname, sizeof(fname), seq);
 		if (ret == -EALREADY)
 			bflow->flags = BOOTFLOWF_USE_PRIOR_FDT;
 		if (!ret) {
 			/* Limit FDT files to 4MB */
 			size = SZ_4M;
 			ret = bootmeth_common_read_file(dev, bflow, fname,
 							fdt_addr, &size);
 		}
 	}

 	if (*fname) {
 		bflow->fdt_fname = strdup(fname);
 		if (!bflow->fdt_fname)
 			return log_msg_ret("fil", -ENOMEM);
 	}

 	if (!ret) {
 		bflow->fdt_size = size;
 		bflow->fdt_addr = fdt_addr;

 		/*
 		 * TODO: Apply extension overlay
 		 *
 		 * Here we need to load and apply the extension overlay. This is
 		 * not implemented. See do_extension_apply(). The extension
 		 * stuff needs an implementation in boot/extension.c so it is
 		 * separate from the command code. Really the extension stuff
 		 * should use the device tree and a uclass / driver interface
 		 * rather than implementing its own list
 		 */
 	} else {
 		log_debug("No device tree available\n");
 		bflow->flags |= BOOTFLOWF_USE_BUILTIN_FDT;
 	}

 	return 0;
 }

 static int distro_efi_read_bootflow_net(struct bootflow *bflow)
 {
 	char file_addr[17], fname[256];
 	char *tftp_argv[] = {"tftp", file_addr, fname, NULL};
 	struct cmd_tbl cmdtp = {};	/* dummy */
 	const char *addr_str, *fdt_addr_str, *bootfile_name;
 	int ret, arch, size;
 	ulong addr, fdt_addr;
 	char str[36];

 	ret = get_efi_pxe_vci(str, sizeof(str));
 	if (ret)
 		return log_msg_ret("vci", ret);
 	ret = get_efi_pxe_arch();
 	if (ret < 0)
 		return log_msg_ret("arc", ret);
 	arch = ret;

 	ret = env_set("bootp_vci", str);
 	if (ret)
 		return log_msg_ret("vcs", ret);
 	ret = env_set_hex("bootp_arch", arch);
 	if (ret)
 		return log_msg_ret("ars", ret);

 	/* figure out the load address */
 	addr_str = env_get("kernel_addr_r");
 	addr = addr_str ? hextoul(addr_str, NULL) : image_load_addr;

 	/* clear any previous bootfile */
 	env_set("bootfile", NULL);

 	/* read the kernel */
 	ret = dhcp_run(addr, NULL, true);
 	if (ret)
 		return log_msg_ret("dhc", ret);

 	size = env_get_hex("filesize", -1);
 	if (size <= 0)
 		return log_msg_ret("sz", -EINVAL);
 	bflow->size = size;

 	/* bootfile should be setup by dhcp */
 	bootfile_name = env_get("bootfile");
 	if (!bootfile_name)
 		return log_msg_ret("bootfile_name", ret);
 	bflow->fname = strdup(bootfile_name);

 	/* do the hideous EFI hack */
 	efi_set_bootdev("Net", "", bflow->fname, map_sysmem(addr, 0),
 			bflow->size);

 	/* read the DT file also */
 	fdt_addr_str = env_get("fdt_addr_r");
 	if (!fdt_addr_str)
 		return log_msg_ret("fdt", -EINVAL);
 	fdt_addr = hextoul(fdt_addr_str, NULL);
 	sprintf(file_addr, "%lx", fdt_addr);

 	/* We only allow the first prefix with PXE */
 	ret = efi_get_distro_fdt_name(fname, sizeof(fname), 0);
 	if (ret)
 		return log_msg_ret("nam", ret);

 	bflow->fdt_fname = strdup(fname);
 	if (!bflow->fdt_fname)
 		return log_msg_ret("fil", -ENOMEM);

 	if (!do_tftpb(&cmdtp, 0, 3, tftp_argv)) {
 		bflow->fdt_size = env_get_hex("filesize", 0);
 		bflow->fdt_addr = fdt_addr;
 	} else {
 		log_debug("No device tree available\n");
 		bflow->flags |= BOOTFLOWF_USE_BUILTIN_FDT;
 	}

 	bflow->state = BOOTFLOWST_READY;

 	return 0;
 }

 static int distro_efi_read_bootflow(struct udevice *dev, struct bootflow *bflow)
 {
 	int ret;

 	log_debug("dev='%s', part=%d\n", bflow->dev->name, bflow->part);

 	/*
 	 * bootmeth_efi doesn't allocate any buffer neither for blk nor net device
 	 * set flag to avoid freeing static buffer.
 	 */
 	bflow->flags |= BOOTFLOWF_STATIC_BUF;

 	if (bootmeth_uses_network(bflow)) {
 		/* we only support reading from one device, so ignore 'dev' */
 		ret = distro_efi_read_bootflow_net(bflow);
 		if (ret)
 			return log_msg_ret("net", ret);
 	} else {
 		ret = distro_efi_try_bootflow_files(dev, bflow);
 		if (ret)
 			return log_msg_ret("blk", ret);
 	}

 	return 0;
 }

 static int distro_efi_boot(struct udevice *dev, struct bootflow *bflow)
 {
 	ulong kernel, fdt;
 	int ret;

 	log_debug("distro EFI boot\n");
 	kernel = env_get_hex("kernel_addr_r", 0);
 	if (!bootmeth_uses_network(bflow)) {
 		ret = efiload_read_file(bflow, kernel);
 		if (ret)
 			return log_msg_ret("read", ret);

 		/*
 		 * use the provided device tree if not using the built-in fdt
 		 */
 		if (bflow->flags & ~BOOTFLOWF_USE_BUILTIN_FDT)
 			fdt = bflow->fdt_addr;

 	} else {
 		/*
 		 * This doesn't actually work for network devices:
 		 *
 		 * do_bootefi_image() No UEFI binary known at 0x02080000
 		 *
 		 * But this is the same behaviour for distro boot, so it can be
 		 * fixed here.
 		 */
 		fdt = env_get_hex("fdt_addr_r", 0);
 	}

 	if (bflow->flags & BOOTFLOWF_USE_BUILTIN_FDT) {
 		log_debug("Booting with built-in fdt\n");
 		if (efi_binary_run(map_sysmem(kernel, 0), bflow->size,
 				   EFI_FDT_USE_INTERNAL))
 			return log_msg_ret("run", -EINVAL);
 	} else {
 		log_debug("Booting with external fdt\n");
 		if (efi_binary_run(map_sysmem(kernel, 0), bflow->size,
 				   map_sysmem(fdt, 0)))
 			return log_msg_ret("run", -EINVAL);
 	}

 	return 0;
 }

 static int distro_bootmeth_efi_bind(struct udevice *dev)
 {
 	struct bootmeth_uc_plat *plat = dev_get_uclass_plat(dev);

 	plat->desc = IS_ENABLED(CONFIG_BOOTSTD_FULL) ?
 		"EFI boot from an .efi file" : "EFI";

 	return 0;
 }

 static struct bootmeth_ops distro_efi_bootmeth_ops = {
 	.check		= distro_efi_check,
 	.read_bootflow	= distro_efi_read_bootflow,
 	.read_file	= bootmeth_common_read_file,
 	.boot		= distro_efi_boot,
 };

 static const struct udevice_id distro_efi_bootmeth_ids[] = {
 	{ .compatible = "u-boot,distro-efi" },
 	{ }
 };

 /* Put a number before 'efi' to provide a default ordering */
 U_BOOT_DRIVER(bootmeth_4efi) = {
 	.name		= "bootmeth_efi",
 	.id		= UCLASS_BOOTMETH,
 	.of_match	= distro_efi_bootmeth_ids,
 	.ops		= &distro_efi_bootmeth_ops,
 	.bind		= distro_bootmeth_efi_bind,
 };
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Bootmethod for distro boot via EFI
	*
	* Copyright 2021 Google LLC
	* Written by Simon Glass <sjg@chromium.org>
	*/

	#define LOG_CATEGORY UCLASS_BOOTSTD

	#include <bootdev.h>
	#include <bootflow.h>
	#include <bootmeth.h>
	#include <command.h>
	#include <dm.h>
	#include <efi_default_filename.h>
	#include <efi_loader.h>
	#include <fs.h>
	#include <malloc.h>
	#include <mapmem.h>
	#include <mmc.h>
	#include <net.h>
	#include <pxe_utils.h>
	#include <linux/sizes.h>

	#define EFI_DIRNAME "/EFI/BOOT/"

	static int get_efi_pxe_arch(void)
	{
	/* http://www.iana.org/assignments/dhcpv6-parameters/dhcpv6-parameters.xml */
	if (IS_ENABLED(CONFIG_ARM64))
	return 0xb;
	else if (IS_ENABLED(CONFIG_ARM))
	return 0xa;
	else if (IS_ENABLED(CONFIG_X86_64))
	return 0x6;
	else if (IS_ENABLED(CONFIG_X86))
	return 0x7;
	else if (IS_ENABLED(CONFIG_ARCH_RV32I))
	return 0x19;
	else if (IS_ENABLED(CONFIG_ARCH_RV64I))
	return 0x1b;
	else if (IS_ENABLED(CONFIG_SANDBOX))
	return 0; /* not used */

	return -EINVAL;
	}

	static int get_efi_pxe_vci(char *str, int max_len)
	{
	int ret;

	ret = get_efi_pxe_arch();
	if (ret < 0)
	return ret;

	snprintf(str, max_len, "PXEClient:Arch:%05x:UNDI:003000", ret);

	return 0;
	}

	/**
	* bootmeth_uses_network() - check if the media device is Ethernet
	*
	* @bflow: Bootflow to check
	* Returns: true if the media device is Ethernet, else false
	*/
	static bool bootmeth_uses_network(struct bootflow *bflow)
	{
	const struct udevice *media = dev_get_parent(bflow->dev);

	return IS_ENABLED(CONFIG_CMD_DHCP) &&
	device_get_uclass_id(media) == UCLASS_ETH;
	}

	static void set_efi_bootdev(struct blk_desc desc, struct bootflow bflow)
	{
	const struct udevice *media_dev;
	int size = bflow->size;
	const char *dev_name;
	char devnum_str[9];
	char dirname[200];
	char *last_slash;

	/*
	* This is a horrible hack to tell EFI about this boot device. Once we
	* unify EFI with the rest of U-Boot we can clean this up. The same hack
	* exists in multiple places, e.g. in the fs, tftp and load commands.
	*
	* Once we can clean up the EFI code to make proper use of driver model,
	* this can go away.
	*/
	media_dev = dev_get_parent(bflow->dev);
	snprintf(devnum_str, sizeof(devnum_str), "%x:%x",
	desc ? desc->devnum : dev_seq(media_dev),
	bflow->part);

	strlcpy(dirname, bflow->fname, sizeof(dirname));
	last_slash = strrchr(dirname, '/');
	if (last_slash)
	*last_slash = '\0';

	dev_name = device_get_uclass_id(media_dev) == UCLASS_MASS_STORAGE ?
	"usb" : blk_get_uclass_name(device_get_uclass_id(media_dev));
	log_debug("setting bootdev %s, %s, %s, %p, %x\n",
	dev_name, devnum_str, bflow->fname, bflow->buf, size);
	efi_set_bootdev(dev_name, devnum_str, bflow->fname, bflow->buf, size);
	}

	static int efiload_read_file(struct bootflow *bflow, ulong addr)
	{
	struct blk_desc *desc = NULL;
	loff_t bytes_read;
	int ret;

	if (bflow->blk)
	desc = dev_get_uclass_plat(bflow->blk);
	ret = bootmeth_setup_fs(bflow, desc);
	if (ret)
	return log_msg_ret("set", ret);

	ret = fs_read(bflow->fname, addr, 0, bflow->size, &bytes_read);
	if (ret)
	return log_msg_ret("read", ret);
	bflow->buf = map_sysmem(addr, bflow->size);

	set_efi_bootdev(desc, bflow);

	return 0;
	}

	static int distro_efi_check(struct udevice dev, struct bootflow_iter iter)
	{
	/* This only works on block and network devices */
	if (bootflow_iter_check_blk(iter) && bootflow_iter_check_net(iter))
	return log_msg_ret("blk", -ENOTSUPP);

	/* This works on block devices and network devices */
	if (iter->method_flags & BOOTFLOW_METHF_PXE_ONLY)
	return log_msg_ret("pxe", -ENOTSUPP);

	return 0;
	}

	/*
	* distro_efi_try_bootflow_files() - Check that files are present
	*
	* This reads any FDT file and checks whether the bootflow file is present, for
	* later reading. We avoid reading the bootflow now, since it is likely large,
	* it may take a long time and we want to avoid needing to allocate memory for
	* it
	*
	* @dev: bootmeth device to use
	* @bflow: bootflow to update
	*/
	static int distro_efi_try_bootflow_files(struct udevice *dev,
	struct bootflow *bflow)
	{
	struct blk_desc *desc = NULL;
	ulong fdt_addr, size;
	char fname[256];
	int ret, seq;

	/* We require a partition table */
	if (!bflow->part) {
	log_debug("no partitions\n");
	return -ENOENT;
	}

	strcpy(fname, EFI_DIRNAME);
	strcat(fname, BOOTEFI_NAME);

	if (bflow->blk)
	desc = dev_get_uclass_plat(bflow->blk);
	ret = bootmeth_try_file(bflow, desc, NULL, fname);
	if (ret) {
	log_debug("File '%s' not found\n", fname);
	return log_msg_ret("try", ret);
	}

	/* Since we can access the file, let's call it ready */
	bflow->state = BOOTFLOWST_READY;

	fdt_addr = env_get_hex("fdt_addr_r", 0);

	/* try the various available names */
	ret = -ENOENT;
	*fname = '\0';
	for (seq = 0; ret == -ENOENT; seq++) {
	ret = efi_get_distro_fdt_name(fname, sizeof(fname), seq);
	if (ret == -EALREADY)
	bflow->flags = BOOTFLOWF_USE_PRIOR_FDT;
	if (!ret) {
	/* Limit FDT files to 4MB */
	size = SZ_4M;
	ret = bootmeth_common_read_file(dev, bflow, fname,
	fdt_addr, &size);
	}
	}

	if (*fname) {
	bflow->fdt_fname = strdup(fname);
	if (!bflow->fdt_fname)
	return log_msg_ret("fil", -ENOMEM);
	}

	if (!ret) {
	bflow->fdt_size = size;
	bflow->fdt_addr = fdt_addr;

	/*
	* TODO: Apply extension overlay
	*
	* Here we need to load and apply the extension overlay. This is
	* not implemented. See do_extension_apply(). The extension
	* stuff needs an implementation in boot/extension.c so it is
	* separate from the command code. Really the extension stuff
	* should use the device tree and a uclass / driver interface
	* rather than implementing its own list
	*/
	} else {
	log_debug("No device tree available\n");
	bflow->flags \|= BOOTFLOWF_USE_BUILTIN_FDT;
	}

	return 0;
	}

	static int distro_efi_read_bootflow_net(struct bootflow *bflow)
	{
	char file_addr[17], fname[256];
	char *tftp_argv[] = {"tftp", file_addr, fname, NULL};
	struct cmd_tbl cmdtp = {}; /* dummy */
	const char addr_str, fdt_addr_str, *bootfile_name;
	int ret, arch, size;
	ulong addr, fdt_addr;
	char str[36];

	ret = get_efi_pxe_vci(str, sizeof(str));
	if (ret)
	return log_msg_ret("vci", ret);
	ret = get_efi_pxe_arch();
	if (ret < 0)
	return log_msg_ret("arc", ret);
	arch = ret;

	ret = env_set("bootp_vci", str);
	if (ret)
	return log_msg_ret("vcs", ret);
	ret = env_set_hex("bootp_arch", arch);
	if (ret)
	return log_msg_ret("ars", ret);

	/* figure out the load address */
	addr_str = env_get("kernel_addr_r");
	addr = addr_str ? hextoul(addr_str, NULL) : image_load_addr;

	/* clear any previous bootfile */
	env_set("bootfile", NULL);

	/* read the kernel */
	ret = dhcp_run(addr, NULL, true);
	if (ret)
	return log_msg_ret("dhc", ret);

	size = env_get_hex("filesize", -1);
	if (size <= 0)
	return log_msg_ret("sz", -EINVAL);
	bflow->size = size;

	/* bootfile should be setup by dhcp */
	bootfile_name = env_get("bootfile");
	if (!bootfile_name)
	return log_msg_ret("bootfile_name", ret);
	bflow->fname = strdup(bootfile_name);

	/* do the hideous EFI hack */
	efi_set_bootdev("Net", "", bflow->fname, map_sysmem(addr, 0),
	bflow->size);

	/* read the DT file also */
	fdt_addr_str = env_get("fdt_addr_r");
	if (!fdt_addr_str)
	return log_msg_ret("fdt", -EINVAL);
	fdt_addr = hextoul(fdt_addr_str, NULL);
	sprintf(file_addr, "%lx", fdt_addr);

	/* We only allow the first prefix with PXE */
	ret = efi_get_distro_fdt_name(fname, sizeof(fname), 0);
	if (ret)
	return log_msg_ret("nam", ret);

	bflow->fdt_fname = strdup(fname);
	if (!bflow->fdt_fname)
	return log_msg_ret("fil", -ENOMEM);

	if (!do_tftpb(&cmdtp, 0, 3, tftp_argv)) {
	bflow->fdt_size = env_get_hex("filesize", 0);
	bflow->fdt_addr = fdt_addr;
	} else {
	log_debug("No device tree available\n");
	bflow->flags \|= BOOTFLOWF_USE_BUILTIN_FDT;
	}

	bflow->state = BOOTFLOWST_READY;

	return 0;
	}

	static int distro_efi_read_bootflow(struct udevice dev, struct bootflow bflow)
	{
	int ret;

	log_debug("dev='%s', part=%d\n", bflow->dev->name, bflow->part);

	/*
	* bootmeth_efi doesn't allocate any buffer neither for blk nor net device
	* set flag to avoid freeing static buffer.
	*/
	bflow->flags \|= BOOTFLOWF_STATIC_BUF;

	if (bootmeth_uses_network(bflow)) {
	/* we only support reading from one device, so ignore 'dev' */
	ret = distro_efi_read_bootflow_net(bflow);
	if (ret)
	return log_msg_ret("net", ret);
	} else {
	ret = distro_efi_try_bootflow_files(dev, bflow);
	if (ret)
	return log_msg_ret("blk", ret);
	}

	return 0;
	}

	static int distro_efi_boot(struct udevice dev, struct bootflow bflow)
	{
	ulong kernel, fdt;
	int ret;

	log_debug("distro EFI boot\n");
	kernel = env_get_hex("kernel_addr_r", 0);
	if (!bootmeth_uses_network(bflow)) {
	ret = efiload_read_file(bflow, kernel);
	if (ret)
	return log_msg_ret("read", ret);

	/*
	* use the provided device tree if not using the built-in fdt
	*/
	if (bflow->flags & ~BOOTFLOWF_USE_BUILTIN_FDT)
	fdt = bflow->fdt_addr;

	} else {
	/*
	* This doesn't actually work for network devices:
	*
	* do_bootefi_image() No UEFI binary known at 0x02080000
	*
	* But this is the same behaviour for distro boot, so it can be
	* fixed here.
	*/
	fdt = env_get_hex("fdt_addr_r", 0);
	}

	if (bflow->flags & BOOTFLOWF_USE_BUILTIN_FDT) {
	log_debug("Booting with built-in fdt\n");
	if (efi_binary_run(map_sysmem(kernel, 0), bflow->size,
	EFI_FDT_USE_INTERNAL))
	return log_msg_ret("run", -EINVAL);
	} else {
	log_debug("Booting with external fdt\n");
	if (efi_binary_run(map_sysmem(kernel, 0), bflow->size,
	map_sysmem(fdt, 0)))
	return log_msg_ret("run", -EINVAL);
	}

	return 0;
	}

	static int distro_bootmeth_efi_bind(struct udevice *dev)
	{
	struct bootmeth_uc_plat *plat = dev_get_uclass_plat(dev);

	plat->desc = IS_ENABLED(CONFIG_BOOTSTD_FULL) ?
	"EFI boot from an .efi file" : "EFI";

	return 0;
	}

	static struct bootmeth_ops distro_efi_bootmeth_ops = {
	.check = distro_efi_check,
	.read_bootflow = distro_efi_read_bootflow,
	.read_file = bootmeth_common_read_file,
	.boot = distro_efi_boot,
	};

	static const struct udevice_id distro_efi_bootmeth_ids[] = {
	{ .compatible = "u-boot,distro-efi" },
	{ }
	};

	/* Put a number before 'efi' to provide a default ordering */
	U_BOOT_DRIVER(bootmeth_4efi) = {
	.name = "bootmeth_efi",
	.id = UCLASS_BOOTMETH,
	.of_match = distro_efi_bootmeth_ids,
	.ops = &distro_efi_bootmeth_ops,
	.bind = distro_bootmeth_efi_bind,
	};