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>master
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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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|
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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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