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https://github.com/brain-hackers/u-boot-brain
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![Heinrich Schuchardt](/assets/img/avatar_default.png)
When be launch a binary via bootefi the bootargs environment variable is used to set the load options in the loaded image protocol. Free memory allocated for load options when the UEFI binary exits. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
680 lines
18 KiB
C
680 lines
18 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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#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 <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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/**
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* Set the load options of an image from an 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 set_load_options(efi_handle_t handle, const char *env_var,
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u16 **load_options)
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{
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struct efi_loaded_image *loaded_image_info;
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size_t size;
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const char *env = env_get(env_var);
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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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ret = EFI_CALL(systab.boottime->open_protocol(
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handle,
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&efi_guid_loaded_image,
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(void **)&loaded_image_info,
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efi_root, NULL,
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EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL));
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if (ret != EFI_SUCCESS)
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return EFI_INVALID_PARAMETER;
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loaded_image_info->load_options = NULL;
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loaded_image_info->load_options_size = 0;
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if (!env)
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goto out;
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size = utf8_utf16_strlen(env) + 1;
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loaded_image_info->load_options = calloc(size, sizeof(u16));
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if (!loaded_image_info->load_options) {
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printf("ERROR: Out of memory\n");
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EFI_CALL(systab.boottime->close_protocol(handle,
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&efi_guid_loaded_image,
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efi_root, NULL));
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return EFI_OUT_OF_RESOURCES;
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}
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pos = loaded_image_info->load_options;
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*load_options = pos;
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utf8_utf16_strcpy(&pos, env);
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loaded_image_info->load_options_size = size * 2;
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out:
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return EFI_CALL(systab.boottime->close_protocol(handle,
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&efi_guid_loaded_image,
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efi_root, NULL));
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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_BOOT_SERVICES_DATA, 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_BOOT_SERVICES_DATA, fdt_pages,
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&new_fdt_addr);
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if (ret != EFI_SUCCESS) {
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printf("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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* efi_carve_out_dt_rsv() - Carve out DT reserved memory ranges
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*
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* The mem_rsv entries of the FDT are added to the memory map. Any failures are
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* ignored because this is not critical and we would rather continue to try to
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* boot.
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*
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* @fdt: Pointer to device tree
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*/
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static void efi_carve_out_dt_rsv(void *fdt)
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{
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int nr_rsv, i;
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uint64_t addr, size, pages;
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nr_rsv = fdt_num_mem_rsv(fdt);
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/* Look for an existing entry and add it to the efi mem map. */
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for (i = 0; i < nr_rsv; i++) {
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if (fdt_get_mem_rsv(fdt, i, &addr, &size) != 0)
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continue;
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/* Convert from sandbox address space. */
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addr = (uintptr_t)map_sysmem(addr, 0);
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pages = efi_size_in_pages(size + (addr & EFI_PAGE_MASK));
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addr &= ~EFI_PAGE_MASK;
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if (efi_add_memory_map(addr, pages, EFI_RESERVED_MEMORY_TYPE,
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false) != EFI_SUCCESS)
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printf("FDT memrsv map %d: Failed to add to map\n", i);
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}
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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_addr is available, the device tree located at that memory address will
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* will be installed as configuration table, otherwise the device tree located
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* at the address indicated by environment variable fdt_addr or as fallback
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* 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_addr: 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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printf("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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printf("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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printf("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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printf("ERROR: invalid 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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/* Prepare device tree for payload */
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ret = copy_fdt(&fdt);
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if (ret) {
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printf("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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printf("ERROR: failed to process device tree\n");
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return EFI_LOAD_ERROR;
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}
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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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printf("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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* @handle: handle of loaded image
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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)
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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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u16 *load_options;
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/* Transfer environment variable as load options */
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ret = set_load_options(handle, "bootargs", &load_options);
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if (ret != EFI_SUCCESS)
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return ret;
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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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printf("## Application terminated, r = %lu\n", ret & ~EFI_ERROR_MASK);
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if (ret && exit_data) {
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printf("## %ls\n", exit_data);
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efi_free_pool(exit_data);
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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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ret = efi_bootmgr_load(&handle);
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if (ret != EFI_SUCCESS) {
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printf("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);
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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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const char *size_str;
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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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char *saddr;
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saddr = env_get("loadaddr");
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size = __efi_helloworld_end - __efi_helloworld_begin;
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if (saddr)
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addr = simple_strtoul(saddr, NULL, 16);
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else
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addr = CONFIG_SYS_LOAD_ADDR;
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image_buf = map_sysmem(addr, size);
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memcpy(image_buf, __efi_helloworld_begin, size);
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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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} else
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#endif
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{
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size_str = env_get("filesize");
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if (size_str)
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size = simple_strtoul(size_str, NULL, 16);
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else
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size = 0;
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addr = simple_strtoul(image_opt, NULL, 16);
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/* Check that a numeric value was passed */
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if (!addr && *image_opt != '0')
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return CMD_RET_USAGE;
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image_buf = map_sysmem(addr, 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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efi_status_t ret;
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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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} else {
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file_path = efi_dp_append(bootefi_device_path,
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bootefi_image_path);
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}
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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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goto out;
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ret = do_bootefi_exec(handle);
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out:
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if (mem_handle)
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efi_delete_handle(mem_handle);
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if (file_path)
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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 */
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return set_load_options((efi_handle_t)*image_objp, load_options_path,
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&load_options);
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}
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/**
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* bootefi_test_prepare() - prepare to run an EFI test
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*
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* Prepare to run a test as if it were provided by a loaded image.
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*
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* @image_objp: pointer to be set to the loaded image handle
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* @loaded_image_infop: pointer to be set to the loaded image protocol
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* @path: dummy file path used to construct the device path
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* set in the loaded image protocol
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* @load_options_path: name of a U-Boot environment variable. Its value is
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* set as load options in the loaded image protocol.
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* Return: status code
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*/
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static efi_status_t bootefi_test_prepare
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(struct efi_loaded_image_obj **image_objp,
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struct efi_loaded_image **loaded_image_infop, const char *path,
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const char *load_options_path)
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{
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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;
|
|
|
|
efi_free_pool(bootefi_image_path);
|
|
bootefi_image_path = NULL;
|
|
failure:
|
|
efi_free_pool(bootefi_device_path);
|
|
bootefi_device_path = NULL;
|
|
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(cmd_tbl_t *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) {
|
|
printf("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
|
|
);
|
|
|
|
/**
|
|
* efi_set_bootdev() - set boot device
|
|
*
|
|
* This function is called when a file is loaded, e.g. via the 'load' command.
|
|
* We use the path to this file to inform the UEFI binary about the boot device.
|
|
*
|
|
* @dev: device, e.g. "MMC"
|
|
* @devnr: number of the device, e.g. "1:2"
|
|
* @path: path to file loaded
|
|
*/
|
|
void efi_set_bootdev(const char *dev, const char *devnr, const char *path)
|
|
{
|
|
struct efi_device_path *device, *image;
|
|
efi_status_t ret;
|
|
|
|
/* efi_set_bootdev is typically called repeatedly, recover memory */
|
|
efi_free_pool(bootefi_device_path);
|
|
efi_free_pool(bootefi_image_path);
|
|
|
|
ret = efi_dp_from_name(dev, devnr, path, &device, &image);
|
|
if (ret == EFI_SUCCESS) {
|
|
bootefi_device_path = device;
|
|
if (image) {
|
|
/* FIXME: image should not contain device */
|
|
struct efi_device_path *image_tmp = image;
|
|
|
|
efi_dp_split_file_path(image, &device, &image);
|
|
efi_free_pool(image_tmp);
|
|
}
|
|
bootefi_image_path = image;
|
|
} else {
|
|
bootefi_device_path = NULL;
|
|
bootefi_image_path = NULL;
|
|
}
|
|
}
|