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https://github.com/brain-hackers/u-boot-brain
synced 2024-08-27 04:18:51 +09:00
![Heinrich Schuchardt](/assets/img/avatar_default.png)
A boot manager like GRUB can use the protocol to * apply U-Boot's fix-ups to the a device-tree * let U-Boot make memory reservations according to the device-tree * install the device-tree as a configuration table Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
672 lines
17 KiB
C
672 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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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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#define LOG_CATEGORY LOGC_EFI
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#include <common.h>
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#include <charset.h>
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#include <command.h>
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#include <dm.h>
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#include <efi_loader.h>
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#include <efi_selftest.h>
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#include <env.h>
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#include <errno.h>
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#include <image.h>
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#include <log.h>
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#include <malloc.h>
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#include <linux/libfdt.h>
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#include <linux/libfdt_env.h>
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#include <mapmem.h>
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#include <memalign.h>
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#include <asm-generic/sections.h>
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#include <linux/linkage.h>
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DECLARE_GLOBAL_DATA_PTR;
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static struct efi_device_path *bootefi_image_path;
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static struct efi_device_path *bootefi_device_path;
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static void *image_addr;
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static size_t image_size;
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/**
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* efi_clear_bootdev() - clear boot device
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*/
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static void efi_clear_bootdev(void)
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{
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efi_free_pool(bootefi_device_path);
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efi_free_pool(bootefi_image_path);
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bootefi_device_path = NULL;
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bootefi_image_path = NULL;
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image_addr = NULL;
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image_size = 0;
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}
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/**
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* efi_set_bootdev() - set boot device
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*
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* This function is called when a file is loaded, e.g. via the 'load' command.
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* We use the path to this file to inform the UEFI binary about the boot device.
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*
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* @dev: device, e.g. "MMC"
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* @devnr: number of the device, e.g. "1:2"
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* @path: path to file loaded
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* @buffer: buffer with file loaded
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* @buffer_size: size of file loaded
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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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void *buffer, size_t buffer_size)
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{
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struct efi_device_path *device, *image;
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efi_status_t ret;
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/* Forget overwritten image */
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if (buffer + buffer_size >= image_addr &&
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image_addr + image_size >= buffer)
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efi_clear_bootdev();
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/* Remember only PE-COFF and FIT images */
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if (efi_check_pe(buffer, buffer_size, NULL) != EFI_SUCCESS) {
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#ifdef CONFIG_FIT
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if (!fit_check_format(buffer))
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return;
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/*
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* FIT images of type EFI_OS are started via command bootm.
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* We should not use their boot device with the bootefi command.
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*/
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buffer = 0;
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buffer_size = 0;
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#else
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return;
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#endif
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}
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/* efi_set_bootdev() is typically called repeatedly, recover memory */
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efi_clear_bootdev();
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image_addr = buffer;
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image_size = buffer_size;
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ret = efi_dp_from_name(dev, devnr, path, &device, &image);
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if (ret == EFI_SUCCESS) {
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bootefi_device_path = device;
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if (image) {
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/* FIXME: image should not contain device */
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struct efi_device_path *image_tmp = image;
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efi_dp_split_file_path(image, &device, &image);
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efi_free_pool(image_tmp);
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}
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bootefi_image_path = image;
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} else {
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efi_clear_bootdev();
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}
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}
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/**
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* efi_env_set_load_options() - set load options from environment variable
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*
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* @handle: the image handle
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* @env_var: name of the environment variable
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* @load_options: pointer to load options (output)
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* Return: status code
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*/
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static efi_status_t efi_env_set_load_options(efi_handle_t handle,
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const char *env_var,
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u16 **load_options)
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{
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const char *env = env_get(env_var);
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size_t size;
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u16 *pos;
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efi_status_t ret;
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*load_options = NULL;
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if (!env)
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return EFI_SUCCESS;
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size = sizeof(u16) * (utf8_utf16_strlen(env) + 1);
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pos = calloc(size, 1);
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if (!pos)
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return EFI_OUT_OF_RESOURCES;
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*load_options = pos;
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utf8_utf16_strcpy(&pos, env);
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ret = efi_set_load_options(handle, size, *load_options);
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if (ret != EFI_SUCCESS) {
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free(*load_options);
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*load_options = NULL;
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}
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return ret;
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}
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#if !CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE)
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/**
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* copy_fdt() - Copy the device tree to a new location available to EFI
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*
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* The FDT is copied to a suitable location within the EFI memory map.
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* Additional 12 KiB are added to the space in case the device tree needs to be
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* expanded later with fdt_open_into().
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*
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* @fdtp: On entry a pointer to the flattened device tree.
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* On exit a pointer to the copy of the flattened device tree.
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* FDT start
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* Return: status code
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*/
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static efi_status_t copy_fdt(void **fdtp)
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{
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unsigned long fdt_ram_start = -1L, fdt_pages;
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efi_status_t ret = 0;
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void *fdt, *new_fdt;
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u64 new_fdt_addr;
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uint fdt_size;
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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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/*
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* Give us at least 12 KiB of breathing room in case the device tree
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* needs to be expanded later.
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*/
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fdt = *fdtp;
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fdt_pages = efi_size_in_pages(fdt_totalsize(fdt) + 0x3000);
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fdt_size = fdt_pages << EFI_PAGE_SHIFT;
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/*
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* Safe fdt location is at 127 MiB.
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* On the sandbox convert from the sandbox address space.
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*/
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new_fdt_addr = (uintptr_t)map_sysmem(fdt_ram_start + 0x7f00000 +
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fdt_size, 0);
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ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
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EFI_ACPI_RECLAIM_MEMORY, fdt_pages,
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&new_fdt_addr);
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if (ret != 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(EFI_PAGE_SIZE, fdt_size);
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ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
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EFI_ACPI_RECLAIM_MEMORY, fdt_pages,
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&new_fdt_addr);
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if (ret != EFI_SUCCESS) {
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log_err("ERROR: Failed to reserve space for FDT\n");
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goto done;
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}
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}
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new_fdt = (void *)(uintptr_t)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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*fdtp = (void *)(uintptr_t)new_fdt_addr;
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done:
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return ret;
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}
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/**
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* get_config_table() - get configuration table
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*
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* @guid: GUID of the configuration table
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* Return: pointer to configuration table or NULL
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*/
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static void *get_config_table(const efi_guid_t *guid)
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{
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size_t i;
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for (i = 0; i < systab.nr_tables; i++) {
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if (!guidcmp(guid, &systab.tables[i].guid))
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return systab.tables[i].table;
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}
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return NULL;
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}
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#endif /* !CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE) */
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/**
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* efi_install_fdt() - install device tree
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*
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* If fdt is not EFI_FDT_USE_INTERNAL, the device tree located at that memory
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* address will will be installed as configuration table, otherwise the device
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* tree located at the address indicated by environment variable fdt_addr or as
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* fallback fdtcontroladdr will be used.
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*
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* On architectures using ACPI tables device trees shall not be installed as
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* configuration table.
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*
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* @fdt: address of device tree or EFI_FDT_USE_INTERNAL to use the
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* the hardware device tree as indicated by environment variable
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* fdt_addr or as fallback the internal device tree as indicated by
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* the environment variable fdtcontroladdr
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* Return: status code
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*/
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efi_status_t efi_install_fdt(void *fdt)
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{
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/*
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* The EBBR spec requires that we have either an FDT or an ACPI table
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* but not both.
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*/
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#if CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE)
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if (fdt) {
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log_err("ERROR: can't have ACPI table and device tree.\n");
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return EFI_LOAD_ERROR;
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}
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#else
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bootm_headers_t img = { 0 };
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efi_status_t ret;
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if (fdt == EFI_FDT_USE_INTERNAL) {
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const char *fdt_opt;
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uintptr_t fdt_addr;
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/* Look for device tree that is already installed */
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if (get_config_table(&efi_guid_fdt))
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return EFI_SUCCESS;
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/* Check if there is a hardware device tree */
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fdt_opt = env_get("fdt_addr");
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/* Use our own device tree as fallback */
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if (!fdt_opt) {
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fdt_opt = env_get("fdtcontroladdr");
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if (!fdt_opt) {
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log_err("ERROR: need device tree\n");
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return EFI_NOT_FOUND;
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}
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}
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fdt_addr = simple_strtoul(fdt_opt, NULL, 16);
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if (!fdt_addr) {
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log_err("ERROR: invalid $fdt_addr or $fdtcontroladdr\n");
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return EFI_LOAD_ERROR;
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}
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fdt = map_sysmem(fdt_addr, 0);
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}
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/* Install device tree */
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if (fdt_check_header(fdt)) {
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log_err("ERROR: invalid device tree\n");
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return EFI_LOAD_ERROR;
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}
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/* Prepare device tree for payload */
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ret = copy_fdt(&fdt);
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if (ret) {
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log_err("ERROR: out of memory\n");
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return EFI_OUT_OF_RESOURCES;
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}
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if (image_setup_libfdt(&img, fdt, 0, NULL)) {
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log_err("ERROR: failed to process device tree\n");
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return EFI_LOAD_ERROR;
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}
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/* Create memory reservations as indicated by the device tree */
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efi_carve_out_dt_rsv(fdt);
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/* Install device tree as UEFI table */
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ret = efi_install_configuration_table(&efi_guid_fdt, fdt);
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if (ret != EFI_SUCCESS) {
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log_err("ERROR: failed to install device tree\n");
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return ret;
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}
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#endif /* GENERATE_ACPI_TABLE */
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return EFI_SUCCESS;
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}
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/**
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* do_bootefi_exec() - execute EFI binary
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*
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* The image indicated by @handle is started. When it returns the allocated
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* memory for the @load_options is freed.
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*
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* @handle: handle of loaded image
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* @load_options: load options
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* Return: status code
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*
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* Load the EFI binary into a newly assigned memory unwinding the relocation
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* information, install the loaded image protocol, and call the binary.
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*/
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static efi_status_t do_bootefi_exec(efi_handle_t handle, void *load_options)
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{
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efi_status_t ret;
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efi_uintn_t exit_data_size = 0;
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u16 *exit_data = NULL;
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/* Call our payload! */
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ret = EFI_CALL(efi_start_image(handle, &exit_data_size, &exit_data));
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if (ret != EFI_SUCCESS) {
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log_err("## Application failed, r = %lu\n",
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ret & ~EFI_ERROR_MASK);
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if (exit_data) {
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log_err("## %ls\n", exit_data);
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efi_free_pool(exit_data);
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}
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}
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efi_restore_gd();
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free(load_options);
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return ret;
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}
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/**
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* do_efibootmgr() - execute EFI boot manager
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*
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* Return: status code
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*/
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static int do_efibootmgr(void)
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{
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efi_handle_t handle;
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efi_status_t ret;
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void *load_options;
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ret = efi_bootmgr_load(&handle, &load_options);
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if (ret != EFI_SUCCESS) {
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log_notice("EFI boot manager: Cannot load any image\n");
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return CMD_RET_FAILURE;
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}
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ret = do_bootefi_exec(handle, load_options);
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if (ret != EFI_SUCCESS)
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return CMD_RET_FAILURE;
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return CMD_RET_SUCCESS;
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}
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/**
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* do_bootefi_image() - execute EFI binary
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*
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* Set up memory image for the binary to be loaded, prepare device path, and
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* then call do_bootefi_exec() to execute it.
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*
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* @image_opt: string of image start address
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* Return: status code
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*/
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static int do_bootefi_image(const char *image_opt)
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{
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void *image_buf;
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unsigned long addr, size;
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efi_status_t ret;
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#ifdef CONFIG_CMD_BOOTEFI_HELLO
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if (!strcmp(image_opt, "hello")) {
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image_buf = __efi_helloworld_begin;
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size = __efi_helloworld_end - __efi_helloworld_begin;
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efi_clear_bootdev();
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} else
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#endif
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{
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addr = strtoul(image_opt, NULL, 16);
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/* Check that a numeric value was passed */
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if (!addr)
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return CMD_RET_USAGE;
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image_buf = map_sysmem(addr, 0);
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if (image_buf != image_addr) {
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log_err("No UEFI binary known at %s\n", image_opt);
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return CMD_RET_FAILURE;
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}
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size = image_size;
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}
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ret = efi_run_image(image_buf, size);
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if (ret != EFI_SUCCESS)
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return CMD_RET_FAILURE;
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return CMD_RET_SUCCESS;
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}
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/**
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* efi_run_image() - run loaded UEFI image
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*
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* @source_buffer: memory address of the UEFI image
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* @source_size: size of the UEFI image
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* Return: status code
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*/
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efi_status_t efi_run_image(void *source_buffer, efi_uintn_t source_size)
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{
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efi_handle_t mem_handle = NULL, handle;
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struct efi_device_path *file_path = NULL;
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struct efi_device_path *msg_path;
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efi_status_t ret;
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u16 *load_options;
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if (!bootefi_device_path || !bootefi_image_path) {
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/*
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* Special case for efi payload not loaded from disk,
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* such as 'bootefi hello' or for example payload
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* loaded directly into memory via JTAG, etc:
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*/
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file_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE,
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(uintptr_t)source_buffer,
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source_size);
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/*
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* Make sure that device for device_path exist
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* in load_image(). Otherwise, shell and grub will fail.
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*/
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ret = efi_create_handle(&mem_handle);
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if (ret != EFI_SUCCESS)
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goto out;
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ret = efi_add_protocol(mem_handle, &efi_guid_device_path,
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file_path);
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if (ret != EFI_SUCCESS)
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goto out;
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msg_path = file_path;
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} else {
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file_path = efi_dp_append(bootefi_device_path,
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bootefi_image_path);
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msg_path = bootefi_image_path;
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}
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log_info("Booting %pD\n", msg_path);
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ret = EFI_CALL(efi_load_image(false, efi_root, file_path, source_buffer,
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source_size, &handle));
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if (ret != EFI_SUCCESS) {
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log_err("Loading image failed\n");
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goto out;
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}
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/* Transfer environment variable as load options */
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ret = efi_env_set_load_options(handle, "bootargs", &load_options);
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if (ret != EFI_SUCCESS)
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goto out;
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ret = do_bootefi_exec(handle, load_options);
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out:
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efi_delete_handle(mem_handle);
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efi_free_pool(file_path);
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return ret;
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}
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#ifdef CONFIG_CMD_BOOTEFI_SELFTEST
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static efi_status_t bootefi_run_prepare(const char *load_options_path,
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struct efi_device_path *device_path,
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struct efi_device_path *image_path,
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struct efi_loaded_image_obj **image_objp,
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struct efi_loaded_image **loaded_image_infop)
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{
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efi_status_t ret;
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u16 *load_options;
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ret = efi_setup_loaded_image(device_path, image_path, image_objp,
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loaded_image_infop);
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if (ret != EFI_SUCCESS)
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return ret;
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/* Transfer environment variable as load options */
|
|
return efi_env_set_load_options((efi_handle_t)*image_objp,
|
|
load_options_path,
|
|
&load_options);
|
|
}
|
|
|
|
/**
|
|
* bootefi_test_prepare() - prepare to run an EFI test
|
|
*
|
|
* Prepare to run a test as if it were provided by a loaded image.
|
|
*
|
|
* @image_objp: pointer to be set to the loaded image handle
|
|
* @loaded_image_infop: pointer to be set to the loaded image protocol
|
|
* @path: dummy file path used to construct the device path
|
|
* set in the loaded image protocol
|
|
* @load_options_path: name of a U-Boot environment variable. Its value is
|
|
* set as load options in the loaded image protocol.
|
|
* Return: status code
|
|
*/
|
|
static efi_status_t bootefi_test_prepare
|
|
(struct efi_loaded_image_obj **image_objp,
|
|
struct efi_loaded_image **loaded_image_infop, const char *path,
|
|
const char *load_options_path)
|
|
{
|
|
efi_status_t ret;
|
|
|
|
/* Construct a dummy device path */
|
|
bootefi_device_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE, 0, 0);
|
|
if (!bootefi_device_path)
|
|
return EFI_OUT_OF_RESOURCES;
|
|
|
|
bootefi_image_path = efi_dp_from_file(NULL, 0, path);
|
|
if (!bootefi_image_path) {
|
|
ret = EFI_OUT_OF_RESOURCES;
|
|
goto failure;
|
|
}
|
|
|
|
ret = bootefi_run_prepare(load_options_path, bootefi_device_path,
|
|
bootefi_image_path, image_objp,
|
|
loaded_image_infop);
|
|
if (ret == EFI_SUCCESS)
|
|
return ret;
|
|
|
|
failure:
|
|
efi_clear_bootdev();
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* bootefi_run_finish() - finish up after running an EFI test
|
|
*
|
|
* @loaded_image_info: Pointer to a struct which holds the loaded image info
|
|
* @image_obj: Pointer to a struct which holds the loaded image object
|
|
*/
|
|
static void bootefi_run_finish(struct efi_loaded_image_obj *image_obj,
|
|
struct efi_loaded_image *loaded_image_info)
|
|
{
|
|
efi_restore_gd();
|
|
free(loaded_image_info->load_options);
|
|
efi_delete_handle(&image_obj->header);
|
|
}
|
|
|
|
/**
|
|
* do_efi_selftest() - execute EFI selftest
|
|
*
|
|
* Return: status code
|
|
*/
|
|
static int do_efi_selftest(void)
|
|
{
|
|
struct efi_loaded_image_obj *image_obj;
|
|
struct efi_loaded_image *loaded_image_info;
|
|
efi_status_t ret;
|
|
|
|
ret = bootefi_test_prepare(&image_obj, &loaded_image_info,
|
|
"\\selftest", "efi_selftest");
|
|
if (ret != EFI_SUCCESS)
|
|
return CMD_RET_FAILURE;
|
|
|
|
/* Execute the test */
|
|
ret = EFI_CALL(efi_selftest(&image_obj->header, &systab));
|
|
bootefi_run_finish(image_obj, loaded_image_info);
|
|
|
|
return ret != EFI_SUCCESS;
|
|
}
|
|
#endif /* CONFIG_CMD_BOOTEFI_SELFTEST */
|
|
|
|
/**
|
|
* do_bootefi() - execute `bootefi` command
|
|
*
|
|
* @cmdtp: table entry describing command
|
|
* @flag: bitmap indicating how the command was invoked
|
|
* @argc: number of arguments
|
|
* @argv: command line arguments
|
|
* Return: status code
|
|
*/
|
|
static int do_bootefi(struct cmd_tbl *cmdtp, int flag, int argc,
|
|
char *const argv[])
|
|
{
|
|
efi_status_t ret;
|
|
void *fdt;
|
|
|
|
if (argc < 2)
|
|
return CMD_RET_USAGE;
|
|
|
|
/* Initialize EFI drivers */
|
|
ret = efi_init_obj_list();
|
|
if (ret != EFI_SUCCESS) {
|
|
log_err("Error: Cannot initialize UEFI sub-system, r = %lu\n",
|
|
ret & ~EFI_ERROR_MASK);
|
|
return CMD_RET_FAILURE;
|
|
}
|
|
|
|
if (argc > 2) {
|
|
uintptr_t fdt_addr;
|
|
|
|
fdt_addr = simple_strtoul(argv[2], NULL, 16);
|
|
fdt = map_sysmem(fdt_addr, 0);
|
|
} else {
|
|
fdt = EFI_FDT_USE_INTERNAL;
|
|
}
|
|
ret = efi_install_fdt(fdt);
|
|
if (ret == EFI_INVALID_PARAMETER)
|
|
return CMD_RET_USAGE;
|
|
else if (ret != EFI_SUCCESS)
|
|
return CMD_RET_FAILURE;
|
|
|
|
if (!strcmp(argv[1], "bootmgr"))
|
|
return do_efibootmgr();
|
|
#ifdef CONFIG_CMD_BOOTEFI_SELFTEST
|
|
else if (!strcmp(argv[1], "selftest"))
|
|
return do_efi_selftest();
|
|
#endif
|
|
|
|
return do_bootefi_image(argv[1]);
|
|
}
|
|
|
|
#ifdef CONFIG_SYS_LONGHELP
|
|
static char bootefi_help_text[] =
|
|
"<image address> [fdt address]\n"
|
|
" - boot EFI payload stored at address <image address>.\n"
|
|
" If specified, the device tree located at <fdt address> gets\n"
|
|
" exposed as EFI configuration table.\n"
|
|
#ifdef CONFIG_CMD_BOOTEFI_HELLO
|
|
"bootefi hello\n"
|
|
" - boot a sample Hello World application stored within U-Boot\n"
|
|
#endif
|
|
#ifdef CONFIG_CMD_BOOTEFI_SELFTEST
|
|
"bootefi selftest [fdt address]\n"
|
|
" - boot an EFI selftest application stored within U-Boot\n"
|
|
" Use environment variable efi_selftest to select a single test.\n"
|
|
" Use 'setenv efi_selftest list' to enumerate all tests.\n"
|
|
#endif
|
|
"bootefi bootmgr [fdt address]\n"
|
|
" - load and boot EFI payload based on BootOrder/BootXXXX variables.\n"
|
|
"\n"
|
|
" If specified, the device tree located at <fdt address> gets\n"
|
|
" exposed as EFI configuration table.\n";
|
|
#endif
|
|
|
|
U_BOOT_CMD(
|
|
bootefi, 3, 0, do_bootefi,
|
|
"Boots an EFI payload from memory",
|
|
bootefi_help_text
|
|
);
|