/* * EFI application loader * * Copyright (c) 2016 Alexander Graf * * SPDX-License-Identifier: GPL-2.0+ */ #include #include #include #include #include #include #include #include DECLARE_GLOBAL_DATA_PTR; /* * When booting using the "bootefi" command, we don't know which * physical device the file came from. So we create a pseudo-device * called "bootefi" with the device path /bootefi. * * In addition to the originating device we also declare the file path * of "bootefi" based loads to be /bootefi. */ static struct efi_device_path_file_path bootefi_image_path[] = { { .dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE, .dp.sub_type = DEVICE_PATH_SUB_TYPE_FILE_PATH, .dp.length = sizeof(bootefi_image_path[0]), .str = { 'b','o','o','t','e','f','i' }, }, { .dp.type = DEVICE_PATH_TYPE_END, .dp.sub_type = DEVICE_PATH_SUB_TYPE_END, .dp.length = sizeof(bootefi_image_path[0]), } }; static struct efi_device_path_file_path bootefi_device_path[] = { { .dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE, .dp.sub_type = DEVICE_PATH_SUB_TYPE_FILE_PATH, .dp.length = sizeof(bootefi_image_path[0]), .str = { 'b','o','o','t','e','f','i' }, }, { .dp.type = DEVICE_PATH_TYPE_END, .dp.sub_type = DEVICE_PATH_SUB_TYPE_END, .dp.length = sizeof(bootefi_image_path[0]), } }; static efi_status_t bootefi_open_dp(void *handle, efi_guid_t *protocol, void **protocol_interface, void *agent_handle, void *controller_handle, uint32_t attributes) { *protocol_interface = bootefi_device_path; return EFI_SUCCESS; } /* The EFI loaded_image interface for the image executed via "bootefi" */ static struct efi_loaded_image loaded_image_info = { .device_handle = bootefi_device_path, .file_path = bootefi_image_path, }; /* The EFI object struct for the image executed via "bootefi" */ static struct efi_object loaded_image_info_obj = { .handle = &loaded_image_info, .protocols = { { /* * When asking for the loaded_image interface, just * return handle which points to loaded_image_info */ .guid = &efi_guid_loaded_image, .open = &efi_return_handle, }, { /* * When asking for the device path interface, return * bootefi_device_path */ .guid = &efi_guid_device_path, .open = &bootefi_open_dp, }, }, }; /* The EFI object struct for the device the "bootefi" image was loaded from */ static struct efi_object bootefi_device_obj = { .handle = bootefi_device_path, .protocols = { { /* When asking for the device path interface, return * bootefi_device_path */ .guid = &efi_guid_device_path, .open = &bootefi_open_dp, } }, }; static void *copy_fdt(void *fdt) { u64 fdt_size = fdt_totalsize(fdt); unsigned long fdt_ram_start = -1L, fdt_pages; u64 new_fdt_addr; void *new_fdt; int i; for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) { u64 ram_start = gd->bd->bi_dram[i].start; u64 ram_size = gd->bd->bi_dram[i].size; if (!ram_size) continue; if (ram_start < fdt_ram_start) fdt_ram_start = ram_start; } /* Give us at least 4kb breathing room */ fdt_size = ALIGN(fdt_size + 4096, 4096); fdt_pages = fdt_size >> EFI_PAGE_SHIFT; /* Safe fdt location is at 128MB */ new_fdt_addr = fdt_ram_start + (128 * 1024 * 1024) + fdt_size; if (efi_allocate_pages(1, EFI_BOOT_SERVICES_DATA, fdt_pages, &new_fdt_addr) != EFI_SUCCESS) { /* If we can't put it there, put it somewhere */ new_fdt_addr = (ulong)memalign(4096, fdt_size); } new_fdt = (void*)(ulong)new_fdt_addr; memcpy(new_fdt, fdt, fdt_totalsize(fdt)); fdt_set_totalsize(new_fdt, fdt_size); return new_fdt; } /* * Load an EFI payload into a newly allocated piece of memory, register all * EFI objects it would want to access and jump to it. */ static unsigned long do_bootefi_exec(void *efi) { ulong (*entry)(void *image_handle, struct efi_system_table *st); ulong fdt_pages, fdt_size, fdt_start, fdt_end; bootm_headers_t img = { 0 }; void *fdt = working_fdt; /* * gd lives in a fixed register which may get clobbered while we execute * the payload. So save it here and restore it on every callback entry */ efi_save_gd(); /* Update system table to point to our currently loaded FDT */ /* Fall back to included fdt if none was manually loaded */ if (!fdt && gd->fdt_blob) fdt = (void *)gd->fdt_blob; if (fdt) { /* Prepare fdt for payload */ fdt = copy_fdt(fdt); if (image_setup_libfdt(&img, fdt, 0, NULL)) { printf("ERROR: Failed to process device tree\n"); return -EINVAL; } /* Link to it in the efi tables */ systab.tables[0].guid = EFI_FDT_GUID; systab.tables[0].table = fdt; systab.nr_tables = 1; /* And reserve the space in the memory map */ fdt_start = ((ulong)fdt) & ~EFI_PAGE_MASK; fdt_end = ((ulong)fdt) + fdt_totalsize(fdt); fdt_size = (fdt_end - fdt_start) + EFI_PAGE_MASK; fdt_pages = fdt_size >> EFI_PAGE_SHIFT; /* Give a bootloader the chance to modify the device tree */ fdt_pages += 2; efi_add_memory_map(fdt_start, fdt_pages, EFI_BOOT_SERVICES_DATA, true); } else { printf("WARNING: No device tree loaded, expect boot to fail\n"); systab.nr_tables = 0; } /* Load the EFI payload */ entry = efi_load_pe(efi, &loaded_image_info); if (!entry) return -ENOENT; /* Initialize and populate EFI object list */ INIT_LIST_HEAD(&efi_obj_list); list_add_tail(&loaded_image_info_obj.link, &efi_obj_list); list_add_tail(&bootefi_device_obj.link, &efi_obj_list); #ifdef CONFIG_PARTITIONS efi_disk_register(); #endif #ifdef CONFIG_LCD efi_gop_register(); #endif /* Call our payload! */ #ifdef DEBUG_EFI printf("%s:%d Jumping to 0x%lx\n", __func__, __LINE__, (long)entry); #endif return entry(&loaded_image_info, &systab); } /* Interpreter command to boot an arbitrary EFI image from memory */ static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { char *saddr; unsigned long addr; int r = 0; if (argc < 2) return 1; saddr = argv[1]; addr = simple_strtoul(saddr, NULL, 16); printf("## Starting EFI application at 0x%08lx ...\n", addr); r = do_bootefi_exec((void *)addr); printf("## Application terminated, r = %d\n", r); if (r != 0) r = 1; return r; } #ifdef CONFIG_SYS_LONGHELP static char bootefi_help_text[] = "\n" " - boot EFI payload stored at address \n" "\n" "Since most EFI payloads want to have a device tree provided, please\n" "make sure you load a device tree using the fdt addr command before\n" "executing bootefi.\n"; #endif U_BOOT_CMD( bootefi, 2, 0, do_bootefi, "Boots an EFI payload from memory\n", bootefi_help_text ); void efi_set_bootdev(const char *dev, const char *devnr, const char *path) { __maybe_unused struct blk_desc *desc; char devname[32] = { 0 }; /* dp->str is u16[32] long */ char *colon; /* Assemble the condensed device name we use in efi_disk.c */ snprintf(devname, sizeof(devname), "%s%s", dev, devnr); colon = strchr(devname, ':'); #ifdef CONFIG_ISO_PARTITION /* For ISOs we create partition block devices */ desc = blk_get_dev(dev, simple_strtol(devnr, NULL, 10)); if (desc && (desc->type != DEV_TYPE_UNKNOWN) && (desc->part_type == PART_TYPE_ISO)) { if (!colon) snprintf(devname, sizeof(devname), "%s%s:1", dev, devnr); colon = NULL; } #endif if (colon) *colon = '\0'; /* Patch bootefi_device_path to the target device */ memset(bootefi_device_path[0].str, 0, sizeof(bootefi_device_path[0].str)); ascii2unicode(bootefi_device_path[0].str, devname); /* Patch bootefi_image_path to the target file path */ memset(bootefi_image_path[0].str, 0, sizeof(bootefi_image_path[0].str)); snprintf(devname, sizeof(devname), "%s", path); ascii2unicode(bootefi_image_path[0].str, devname); }