U-Boot. Исходные тексты команд: bootefi.c // SPDX-License-Identifier: GPL-2.0+
/*
* EFI application loader
*
* Copyright (c) 2016 Alexander Graf
*/
#define LOG_CATEGORY LOGC_EFI
#include <common.h>
#include <bootm.h>
#include <charset.h>
#include <command.h>
#include <dm.h>
#include <efi_loader.h>
#include <efi_selftest.h>
#include <env.h>
#include <errno.h>
#include <image.h>
#include <log.h>
#include <malloc.h>
#include <asm/global_data.h>
#include <linux/libfdt.h>
#include <linux/libfdt_env.h>
#include <mapmem.h>
#include <memalign.h>
#include <asm-generic/sections.h>
#include <linux/linkage.h>
DECLARE_GLOBAL_DATA_PTR;
static struct efi_device_path *bootefi_image_path;
static struct efi_device_path *bootefi_device_path;
static void *image_addr;
static size_t image_size;
/**
* efi_get_image_parameters() - return image parameters
*
* @img_addr: address of loaded image in memory
* @img_size: size of loaded image
*/
void efi_get_image_parameters(void **img_addr, size_t *img_size)
{
*img_addr = image_addr;
*img_size = image_size;
}
/**
* efi_clear_bootdev() - clear boot device
*/
static void efi_clear_bootdev(void)
{
efi_free_pool(bootefi_device_path);
efi_free_pool(bootefi_image_path);
bootefi_device_path = NULL;
bootefi_image_path = NULL;
image_addr = NULL;
image_size = 0;
}
/**
* 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
* @buffer: buffer with file loaded
* @buffer_size: size of file loaded
*/
void efi_set_bootdev(const char *dev, const char *devnr, const char *path,
void *buffer, size_t buffer_size)
{
struct efi_device_path *device, *image;
efi_status_t ret;
log_debug("dev=%s, devnr=%s, path=%s, buffer=%p, size=%zx\n", dev,
devnr, path, buffer, buffer_size);
/* Forget overwritten image */
if (buffer + buffer_size >= image_addr &&
image_addr + image_size >= buffer)
efi_clear_bootdev();
/* Remember only PE-COFF and FIT images */
if (efi_check_pe(buffer, buffer_size, NULL) != EFI_SUCCESS) {
if (IS_ENABLED(CONFIG_FIT) &&
!fit_check_format(buffer, IMAGE_SIZE_INVAL)) {
/*
* FIT images of type EFI_OS are started via command
* bootm. We should not use their boot device with the
* bootefi command.
*/
buffer = 0;
buffer_size = 0;
} else {
log_debug("- not remembering image\n");
return;
}
}
/* efi_set_bootdev() is typically called repeatedly, recover memory */
efi_clear_bootdev();
image_addr = buffer;
image_size = buffer_size;
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;
log_debug("- boot device %pD\n", device);
if (image)
log_debug("- image %pD\n", image);
} else {
log_debug("- efi_dp_from_name() failed, err=%lx\n", ret);
efi_clear_bootdev();
}
}
/**
* efi_env_set_load_options() - set load options from environment variable
*
* @handle: the image handle
* @env_var: name of the environment variable
* @load_options: pointer to load options (output)
* Return: status code
*/
static efi_status_t efi_env_set_load_options(efi_handle_t handle,
const char *env_var,
u16 **load_options)
{
const char *env = env_get(env_var);
size_t size;
u16 *pos;
efi_status_t ret;
*load_options = NULL;
if (!env)
return EFI_SUCCESS;
size = sizeof(u16) * (utf8_utf16_strlen(env) + 1);
pos = calloc(size, 1);
if (!pos)
return EFI_OUT_OF_RESOURCES;
*load_options = pos;
utf8_utf16_strcpy(&pos, env);
ret = efi_set_load_options(handle, size, *load_options);
if (ret != EFI_SUCCESS) {
free(*load_options);
*load_options = NULL;
}
return ret;
}
#if !CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE)
/**
* copy_fdt() - Copy the device tree to a new location available to EFI
*
* The FDT is copied to a suitable location within the EFI memory map.
* Additional 12 KiB are added to the space in case the device tree needs to be
* expanded later with fdt_open_into().
*
* @fdtp: On entry a pointer to the flattened device tree.
* On exit a pointer to the copy of the flattened device tree.
* FDT start
* Return: status code
*/
static efi_status_t copy_fdt(void **fdtp)
{
unsigned long fdt_ram_start = -1L, fdt_pages;
efi_status_t ret = 0;
void *fdt, *new_fdt;
u64 new_fdt_addr;
uint fdt_size;
int i;
for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
u64 ram_start = gd->bd->bi_dram[i].start;
u64 ram_size = gd->bd->bi_dram[i].size;
if (!ram_size)
continue;
if (ram_start < fdt_ram_start)
fdt_ram_start = ram_start;
}
/*
* Give us at least 12 KiB of breathing room in case the device tree
* needs to be expanded later.
*/
fdt = *fdtp;
fdt_pages = efi_size_in_pages(fdt_totalsize(fdt) + 0x3000);
fdt_size = fdt_pages << EFI_PAGE_SHIFT;
ret = efi_allocate_pages(EFI_ALLOCATE_ANY_PAGES,
EFI_ACPI_RECLAIM_MEMORY, fdt_pages,
&new_fdt_addr);
if (ret != EFI_SUCCESS) {
log_err("ERROR: Failed to reserve space for FDT\n");
goto done;
}
new_fdt = (void *)(uintptr_t)new_fdt_addr;
memcpy(new_fdt, fdt, fdt_totalsize(fdt));
fdt_set_totalsize(new_fdt, fdt_size);
*fdtp = (void *)(uintptr_t)new_fdt_addr;
done:
return ret;
}
/**
* get_config_table() - get configuration table
*
* @guid: GUID of the configuration table
* Return: pointer to configuration table or NULL
*/
static void *get_config_table(const efi_guid_t *guid)
{
size_t i;
for (i = 0; i < systab.nr_tables; i++) {
if (!guidcmp(guid, &systab.tables[i].guid))
return systab.tables[i].table;
}
return NULL;
}
#endif /* !CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE) */
/**
* efi_install_fdt() - install device tree
*
* If fdt is not EFI_FDT_USE_INTERNAL, the device tree located at that memory
* address will will be installed as configuration table, otherwise the device
* tree located at the address indicated by environment variable fdt_addr or as
* fallback fdtcontroladdr will be used.
*
* On architectures using ACPI tables device trees shall not be installed as
* configuration table.
*
* @fdt: address of device tree or EFI_FDT_USE_INTERNAL to use the
* the hardware device tree as indicated by environment variable
* fdt_addr or as fallback the internal device tree as indicated by
* the environment variable fdtcontroladdr
* Return: status code
*/
efi_status_t efi_install_fdt(void *fdt)
{
/*
* The EBBR spec requires that we have either an FDT or an ACPI table
* but not both.
*/
#if CONFIG_IS_ENABLED(GENERATE_ACPI_TABLE)
if (fdt) {
log_warning("WARNING: Can't have ACPI table and device tree - ignoring DT.\n");
return EFI_SUCCESS;
}
#else
struct bootm_headers img = { 0 };
efi_status_t ret;
if (fdt == EFI_FDT_USE_INTERNAL) {
const char *fdt_opt;
uintptr_t fdt_addr;
/* Look for device tree that is already installed */
if (get_config_table(&efi_guid_fdt))
return EFI_SUCCESS;
/* Check if there is a hardware device tree */
fdt_opt = env_get("fdt_addr");
/* Use our own device tree as fallback */
if (!fdt_opt) {
fdt_opt = env_get("fdtcontroladdr");
if (!fdt_opt) {
log_err("ERROR: need device tree\n");
return EFI_NOT_FOUND;
}
}
fdt_addr = hextoul(fdt_opt, NULL);
if (!fdt_addr) {
log_err("ERROR: invalid $fdt_addr or $fdtcontroladdr\n");
return EFI_LOAD_ERROR;
}
fdt = map_sysmem(fdt_addr, 0);
}
/* Install device tree */
if (fdt_check_header(fdt)) {
log_err("ERROR: invalid device tree\n");
return EFI_LOAD_ERROR;
}
/* Prepare device tree for payload */
ret = copy_fdt(&fdt);
if (ret) {
log_err("ERROR: out of memory\n");
return EFI_OUT_OF_RESOURCES;
}
if (image_setup_libfdt(&img, fdt, 0, NULL)) {
log_err("ERROR: failed to process device tree\n");
return EFI_LOAD_ERROR;
}
/* Create memory reservations as indicated by the device tree */
efi_carve_out_dt_rsv(fdt);
efi_try_purge_kaslr_seed(fdt);
if (CONFIG_IS_ENABLED(EFI_TCG2_PROTOCOL_MEASURE_DTB)) {
ret = efi_tcg2_measure_dtb(fdt);
if (ret == EFI_SECURITY_VIOLATION) {
log_err("ERROR: failed to measure DTB\n");
return ret;
}
}
/* Install device tree as UEFI table */
ret = efi_install_configuration_table(&efi_guid_fdt, fdt);
if (ret != EFI_SUCCESS) {
log_err("ERROR: failed to install device tree\n");
return ret;
}
#endif /* GENERATE_ACPI_TABLE */
return EFI_SUCCESS;
}
/**
* do_bootefi_exec() - execute EFI binary
*
* The image indicated by @handle is started. When it returns the allocated
* memory for the @load_options is freed.
*
* @handle: handle of loaded image
* @load_options: load options
* Return: status code
*
* Load the EFI binary into a newly assigned memory unwinding the relocation
* information, install the loaded image protocol, and call the binary.
*/
static efi_status_t do_bootefi_exec(efi_handle_t handle, void *load_options)
{
efi_status_t ret;
efi_uintn_t exit_data_size = 0;
u16 *exit_data = NULL;
/* On ARM switch from EL3 or secure mode to EL2 or non-secure mode */
switch_to_non_secure_mode();
/*
* The UEFI standard requires that the watchdog timer is set to five
* minutes when invoking an EFI boot option.
*
* Unified Extensible Firmware Interface (UEFI), version 2.7 Errata A
* 7.5. Miscellaneous Boot Services - EFI_BOOT_SERVICES.SetWatchdogTimer
*/
ret = efi_set_watchdog(300);
if (ret != EFI_SUCCESS) {
log_err("ERROR: Failed to set watchdog timer\n");
goto out;
}
/* Call our payload! */
ret = EFI_CALL(efi_start_image(handle, &exit_data_size, &exit_data));
if (ret != EFI_SUCCESS) {
log_err("## Application failed, r = %lu\n",
ret & ~EFI_ERROR_MASK);
if (exit_data) {
log_err("## %ls\n", exit_data);
efi_free_pool(exit_data);
}
}
efi_restore_gd();
out:
free(load_options);
if (IS_ENABLED(CONFIG_EFI_LOAD_FILE2_INITRD)) {
if (efi_initrd_deregister() != EFI_SUCCESS)
log_err("Failed to remove loadfile2 for initrd\n");
}
/* Control is returned to U-Boot, disable EFI watchdog */
efi_set_watchdog(0);
return ret;
}
/**
* do_efibootmgr() - execute EFI boot manager
*
* Return: status code
*/
static int do_efibootmgr(void)
{
efi_handle_t handle;
efi_status_t ret;
void *load_options;
ret = efi_bootmgr_load(&handle, &load_options);
if (ret != EFI_SUCCESS) {
log_notice("EFI boot manager: Cannot load any image\n");
return CMD_RET_FAILURE;
}
ret = do_bootefi_exec(handle, load_options);
if (ret != EFI_SUCCESS)
return CMD_RET_FAILURE;
return CMD_RET_SUCCESS;
}
/**
* do_bootefi_image() - execute EFI binary
*
* Set up memory image for the binary to be loaded, prepare device path, and
* then call do_bootefi_exec() to execute it.
*
* @image_opt: string with image start address
* @size_opt: string with image size or NULL
* Return: status code
*/
static int do_bootefi_image(const char *image_opt, const char *size_opt)
{
void *image_buf;
unsigned long addr, size;
efi_status_t ret;
#ifdef CONFIG_CMD_BOOTEFI_HELLO
if (!strcmp(image_opt, "hello")) {
image_buf = __efi_helloworld_begin;
size = __efi_helloworld_end - __efi_helloworld_begin;
efi_clear_bootdev();
} else
#endif
{
addr = strtoul(image_opt, NULL, 16);
/* Check that a numeric value was passed */
if (!addr)
return CMD_RET_USAGE;
image_buf = map_sysmem(addr, 0);
if (size_opt) {
size = strtoul(size_opt, NULL, 16);
if (!size)
return CMD_RET_USAGE;
efi_clear_bootdev();
} else {
if (image_buf != image_addr) {
log_err("No UEFI binary known at %s\n",
image_opt);
return CMD_RET_FAILURE;
}
size = image_size;
}
}
ret = efi_run_image(image_buf, size);
if (ret != EFI_SUCCESS)
return CMD_RET_FAILURE;
return CMD_RET_SUCCESS;
}
/**
* efi_run_image() - run loaded UEFI image
*
* @source_buffer: memory address of the UEFI image
* @source_size: size of the UEFI image
* Return: status code
*/
efi_status_t efi_run_image(void *source_buffer, efi_uintn_t source_size)
{
efi_handle_t mem_handle = NULL, handle;
struct efi_device_path *file_path = NULL;
struct efi_device_path *msg_path;
efi_status_t ret, ret2;
u16 *load_options;
if (!bootefi_device_path || !bootefi_image_path) {
log_debug("Not loaded from disk\n");
/*
* Special case for efi payload not loaded from disk,
* such as 'bootefi hello' or for example payload
* loaded directly into memory via JTAG, etc:
*/
file_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE,
(uintptr_t)source_buffer,
source_size);
/*
* Make sure that device for device_path exist
* in load_image(). Otherwise, shell and grub will fail.
*/
ret = efi_install_multiple_protocol_interfaces(&mem_handle,
&efi_guid_device_path,
file_path, NULL);
if (ret != EFI_SUCCESS)
goto out;
msg_path = file_path;
} else {
file_path = efi_dp_append(bootefi_device_path,
bootefi_image_path);
msg_path = bootefi_image_path;
log_debug("Loaded from disk\n");
}
log_info("Booting %pD\n", msg_path);
ret = EFI_CALL(efi_load_image(false, efi_root, file_path, source_buffer,
source_size, &handle));
if (ret != EFI_SUCCESS) {
log_err("Loading image failed\n");
goto out;
}
/* Transfer environment variable as load options */
ret = efi_env_set_load_options(handle, "bootargs", &load_options);
if (ret != EFI_SUCCESS)
goto out;
ret = do_bootefi_exec(handle, load_options);
out:
ret2 = efi_uninstall_multiple_protocol_interfaces(mem_handle,
&efi_guid_device_path,
file_path, NULL);
efi_free_pool(file_path);
return (ret != EFI_SUCCESS) ? ret : ret2;
}
#ifdef CONFIG_CMD_BOOTEFI_SELFTEST
static efi_status_t bootefi_run_prepare(const char *load_options_path,
struct efi_device_path *device_path,
struct efi_device_path *image_path,
struct efi_loaded_image_obj **image_objp,
struct efi_loaded_image **loaded_image_infop)
{
efi_status_t ret;
u16 *load_options;
ret = efi_setup_loaded_image(device_path, image_path, image_objp,
loaded_image_infop);
if (ret != EFI_SUCCESS)
return ret;
/* 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, 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;
}
/**
* 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));
efi_restore_gd();
free(loaded_image_info->load_options);
if (ret != EFI_SUCCESS)
efi_delete_handle(&image_obj->header);
else
ret = efi_delete_handle(&image_obj->header);
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;
char *img_addr, *img_size, *str_copy, *pos;
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 = hextoul(argv[2], NULL);
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 (IS_ENABLED(CONFIG_CMD_BOOTEFI_BOOTMGR)) {
if (!strcmp(argv[1], "bootmgr"))
return do_efibootmgr();
}
#ifdef CONFIG_CMD_BOOTEFI_SELFTEST
if (!strcmp(argv[1], "selftest"))
return do_efi_selftest();
#endif
str_copy = strdup(argv[1]);
if (!str_copy) {
log_err("Out of memory\n");
return CMD_RET_FAILURE;
}
pos = str_copy;
img_addr = strsep(&pos, ":");
img_size = strsep(&pos, ":");
ret = do_bootefi_image(img_addr, img_size);
free(str_copy);
return ret;
}
U_BOOT_LONGHELP(bootefi,
"<image address>[:<image size>] [<fdt address>]\n"
" - boot EFI payload\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
#ifdef CONFIG_CMD_BOOTEFI_BOOTMGR
"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, 4, 0, do_bootefi,
"Boots an EFI payload from memory",
bootefi_help_text
);
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