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efi_loader: Add "bootefi" command
In order to execute an EFI application, we need to bridge the gap between U-Boot's notion of executing images and EFI's notion of doing the same. The best path forward IMHO here is to stick completely to the way U-Boot deals with payloads. You manually load them using whatever method to RAM and then have a simple boot command to execute them. So in our case, you would do # load mmc 0:1 $loadaddr grub.efi # bootefi $loadaddr which then gets you into a grub shell. Fdt information known to U-boot via the fdt addr command is also passed to the EFI payload. Signed-off-by: Alexander Graf <agraf@suse.de> Reviewed-by: Simon Glass <sjg@chromium.org> Tested-by: Simon Glass <sjg@chromium.org> [trini: Guard help text with CONFIG_SYS_LONGHELP] Signed-off-by: Tom Rini <trini@konsulko.com>
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@ -148,6 +148,13 @@ config CMD_BOOTM
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help
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Boot an application image from the memory.
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config CMD_BOOTEFI
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bool "bootefi"
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depends on EFI_LOADER
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default y
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help
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Boot an EFI image from memory.
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config CMD_ELF
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bool "bootelf, bootvx"
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default y
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@ -21,6 +21,7 @@ obj-$(CONFIG_CMD_SOURCE) += source.o
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obj-$(CONFIG_CMD_BDI) += bdinfo.o
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obj-$(CONFIG_CMD_BEDBUG) += bedbug.o
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obj-$(CONFIG_CMD_BMP) += bmp.o
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obj-$(CONFIG_CMD_BOOTEFI) += bootefi.o
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obj-$(CONFIG_CMD_BOOTMENU) += bootmenu.o
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obj-$(CONFIG_CMD_BOOTLDR) += bootldr.o
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obj-$(CONFIG_CMD_BOOTSTAGE) += bootstage.o
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182
cmd/bootefi.c
Normal file
182
cmd/bootefi.c
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@ -0,0 +1,182 @@
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/*
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* EFI application loader
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*
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* Copyright (c) 2016 Alexander Graf
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <command.h>
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#include <efi_loader.h>
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#include <errno.h>
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#include <libfdt.h>
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#include <libfdt_env.h>
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/*
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* When booting using the "bootefi" command, we don't know which
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* physical device the file came from. So we create a pseudo-device
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* called "bootefi" with the device path /bootefi.
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*
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* In addition to the originating device we also declare the file path
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* of "bootefi" based loads to be /bootefi.
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*/
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static struct efi_device_path_file_path bootefi_dummy_path[] = {
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{
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.dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE,
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.dp.sub_type = DEVICE_PATH_SUB_TYPE_FILE_PATH,
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.dp.length = sizeof(bootefi_dummy_path[0]),
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.str = { 'b','o','o','t','e','f','i' },
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}, {
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.dp.type = DEVICE_PATH_TYPE_END,
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.dp.sub_type = DEVICE_PATH_SUB_TYPE_END,
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.dp.length = sizeof(bootefi_dummy_path[0]),
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}
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};
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static efi_status_t bootefi_open_dp(void *handle, efi_guid_t *protocol,
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void **protocol_interface, void *agent_handle,
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void *controller_handle, uint32_t attributes)
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{
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*protocol_interface = bootefi_dummy_path;
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return EFI_SUCCESS;
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}
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/* The EFI loaded_image interface for the image executed via "bootefi" */
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static struct efi_loaded_image loaded_image_info = {
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.device_handle = bootefi_dummy_path,
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.file_path = bootefi_dummy_path,
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};
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/* The EFI object struct for the image executed via "bootefi" */
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static struct efi_object loaded_image_info_obj = {
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.handle = &loaded_image_info,
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.protocols = {
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{
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/*
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* When asking for the loaded_image interface, just
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* return handle which points to loaded_image_info
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*/
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.guid = &efi_guid_loaded_image,
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.open = &efi_return_handle,
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},
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{
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/*
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* When asking for the device path interface, return
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* bootefi_dummy_path
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*/
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.guid = &efi_guid_device_path,
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.open = &bootefi_open_dp,
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},
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},
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};
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/* The EFI object struct for the device the "bootefi" image was loaded from */
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static struct efi_object bootefi_device_obj = {
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.handle = bootefi_dummy_path,
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.protocols = {
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{
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/* When asking for the device path interface, return
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* bootefi_dummy_path */
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.guid = &efi_guid_device_path,
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.open = &bootefi_open_dp,
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}
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},
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};
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/*
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* Load an EFI payload into a newly allocated piece of memory, register all
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* EFI objects it would want to access and jump to it.
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*/
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static unsigned long do_bootefi_exec(void *efi)
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{
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ulong (*entry)(void *image_handle, struct efi_system_table *st);
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ulong fdt_pages, fdt_size, fdt_start, fdt_end;
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/*
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* gd lives in a fixed register which may get clobbered while we execute
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* the payload. So save it here and restore it on every callback entry
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*/
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efi_save_gd();
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/* Update system table to point to our currently loaded FDT */
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if (working_fdt) {
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systab.tables[0].guid = EFI_FDT_GUID;
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systab.tables[0].table = working_fdt;
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systab.nr_tables = 1;
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/* And reserve the space in the memory map */
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fdt_start = ((ulong)working_fdt) & ~EFI_PAGE_MASK;
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fdt_end = ((ulong)working_fdt) + fdt_totalsize(working_fdt);
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fdt_size = (fdt_end - fdt_start) + EFI_PAGE_MASK;
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fdt_pages = fdt_size >> EFI_PAGE_SHIFT;
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/* Give a bootloader the chance to modify the device tree */
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fdt_pages += 2;
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efi_add_memory_map(fdt_start, fdt_pages,
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EFI_BOOT_SERVICES_DATA, true);
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} else {
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printf("WARNING: No device tree loaded, expect boot to fail\n");
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systab.nr_tables = 0;
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}
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/* Load the EFI payload */
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entry = efi_load_pe(efi, &loaded_image_info);
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if (!entry)
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return -ENOENT;
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/* Initialize and populate EFI object list */
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INIT_LIST_HEAD(&efi_obj_list);
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list_add_tail(&loaded_image_info_obj.link, &efi_obj_list);
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list_add_tail(&bootefi_device_obj.link, &efi_obj_list);
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#ifdef CONFIG_PARTITIONS
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efi_disk_register();
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#endif
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/* Call our payload! */
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#ifdef DEBUG_EFI
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printf("%s:%d Jumping to 0x%lx\n", __func__, __LINE__, (long)entry);
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#endif
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return entry(&loaded_image_info, &systab);
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}
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/* Interpreter command to boot an arbitrary EFI image from memory */
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static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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char *saddr;
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unsigned long addr;
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int r = 0;
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if (argc < 2)
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return 1;
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saddr = argv[1];
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addr = simple_strtoul(saddr, NULL, 16);
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printf("## Starting EFI application at 0x%08lx ...\n", addr);
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r = do_bootefi_exec((void *)addr);
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printf("## Application terminated, r = %d\n", r);
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if (r != 0)
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r = 1;
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return r;
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}
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#ifdef CONFIG_SYS_LONGHELP
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static char bootefi_help_text[] =
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"<image address>\n"
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" - boot EFI payload stored at address <image address>\n"
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"\n"
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"Since most EFI payloads want to have a device tree provided, please\n"
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"make sure you load a device tree using the fdt addr command before\n"
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"executing bootefi.\n";
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#endif
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U_BOOT_CMD(
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bootefi, 2, 0, do_bootefi,
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"Boots an EFI payload from memory\n",
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bootefi_help_text
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);
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