avionic design with actual uboot and tooling
submodule of avionic design uboot bootloader and with included tools to get you started , read readme.md and readme-tk1-loader.md
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295
u-boot/cmd/bootefi.c
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295
u-boot/cmd/bootefi.c
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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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#include <memalign.h>
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#include <asm/global_data.h>
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DECLARE_GLOBAL_DATA_PTR;
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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_image_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_image_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_image_path[0]),
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}
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};
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static struct efi_device_path_file_path bootefi_device_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_image_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_image_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_device_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_device_path,
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.file_path = bootefi_image_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_device_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_device_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_device_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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static void *copy_fdt(void *fdt)
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{
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u64 fdt_size = fdt_totalsize(fdt);
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unsigned long fdt_ram_start = -1L, fdt_pages;
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u64 new_fdt_addr;
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void *new_fdt;
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int i;
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for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
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u64 ram_start = gd->bd->bi_dram[i].start;
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u64 ram_size = gd->bd->bi_dram[i].size;
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if (!ram_size)
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continue;
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if (ram_start < fdt_ram_start)
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fdt_ram_start = ram_start;
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}
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/* Give us at least 4kb breathing room */
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fdt_size = ALIGN(fdt_size + 4096, 4096);
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fdt_pages = fdt_size >> EFI_PAGE_SHIFT;
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/* Safe fdt location is at 128MB */
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new_fdt_addr = fdt_ram_start + (128 * 1024 * 1024) + fdt_size;
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if (efi_allocate_pages(1, EFI_BOOT_SERVICES_DATA, fdt_pages,
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&new_fdt_addr) != EFI_SUCCESS) {
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/* If we can't put it there, put it somewhere */
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new_fdt_addr = (ulong)memalign(4096, fdt_size);
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}
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new_fdt = (void*)(ulong)new_fdt_addr;
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memcpy(new_fdt, fdt, fdt_totalsize(fdt));
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fdt_set_totalsize(new_fdt, fdt_size);
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return new_fdt;
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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, void *fdt)
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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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bootm_headers_t img = { 0 };
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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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if (fdt && !fdt_check_header(fdt)) {
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/* Prepare fdt for payload */
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fdt = copy_fdt(fdt);
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if (image_setup_libfdt(&img, fdt, 0, NULL)) {
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printf("ERROR: Failed to process device tree\n");
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return -EINVAL;
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}
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/* Link to it in the efi tables */
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systab.tables[0].guid = EFI_FDT_GUID;
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systab.tables[0].table = 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)fdt) & ~EFI_PAGE_MASK;
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fdt_end = ((ulong)fdt) + fdt_totalsize(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: Invalid device tree, 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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#ifdef CONFIG_LCD
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efi_gop_register();
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#endif
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#ifdef CONFIG_NET
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void *nethandle = loaded_image_info.device_handle;
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efi_net_register(&nethandle);
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if (!memcmp(bootefi_device_path[0].str, "N\0e\0t", 6))
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loaded_image_info.device_handle = nethandle;
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#endif
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/* Call our payload! */
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debug("%s:%d Jumping to 0x%lx\n", __func__, __LINE__, (long)entry);
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if (setjmp(&loaded_image_info.exit_jmp)) {
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efi_status_t status = loaded_image_info.exit_status;
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return status == EFI_SUCCESS ? 0 : -EINVAL;
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}
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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, *sfdt;
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unsigned long addr, fdt_addr = 0;
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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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if (argc > 2) {
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sfdt = argv[2];
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fdt_addr = simple_strtoul(sfdt, NULL, 16);
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}
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printf("## Starting EFI application at 0x%08lx ...\n", addr);
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r = do_bootefi_exec((void *)addr, (void*)fdt_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> [fdt address]\n"
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" - boot EFI payload stored at address <image address>.\n"
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" If specified, the device tree located at <fdt address> gets\n"
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" exposed as EFI configuration table.\n";
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#endif
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U_BOOT_CMD(
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bootefi, 3, 0, do_bootefi,
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"Boots an EFI payload from memory",
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bootefi_help_text
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);
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void efi_set_bootdev(const char *dev, const char *devnr, const char *path)
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{
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__maybe_unused struct blk_desc *desc;
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char devname[32] = { 0 }; /* dp->str is u16[32] long */
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char *colon;
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/* Assemble the condensed device name we use in efi_disk.c */
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snprintf(devname, sizeof(devname), "%s%s", dev, devnr);
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colon = strchr(devname, ':');
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#ifdef CONFIG_ISO_PARTITION
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/* For ISOs we create partition block devices */
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desc = blk_get_dev(dev, simple_strtol(devnr, NULL, 10));
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if (desc && (desc->type != DEV_TYPE_UNKNOWN) &&
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(desc->part_type == PART_TYPE_ISO)) {
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if (!colon)
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snprintf(devname, sizeof(devname), "%s%s:1", dev,
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devnr);
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colon = NULL;
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}
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#endif
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if (colon)
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*colon = '\0';
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/* Patch bootefi_device_path to the target device */
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memset(bootefi_device_path[0].str, 0, sizeof(bootefi_device_path[0].str));
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ascii2unicode(bootefi_device_path[0].str, devname);
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/* Patch bootefi_image_path to the target file path */
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memset(bootefi_image_path[0].str, 0, sizeof(bootefi_image_path[0].str));
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snprintf(devname, sizeof(devname), "%s", path);
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ascii2unicode(bootefi_image_path[0].str, devname);
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}
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