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// SPDX-License-Identifier: GPL-2.0+
/*
* EFI application loader
*
* Copyright (c) 2016 Alexander Graf
*/
#include <common.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 <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;
/**
* Set the load options of an image from an environment variable.
*
* @handle: the image handle
* @env_var: name of the environment variable
* Return: status code
*/
static efi_status_t set_load_options(efi_handle_t handle, const char *env_var)
{
struct efi_loaded_image *loaded_image_info;
size_t size;
const char *env = env_get(env_var);
u16 *pos;
efi_status_t ret;
ret = EFI_CALL(systab.boottime->open_protocol(
handle,
&efi_guid_loaded_image,
(void **)&loaded_image_info,
efi_root, NULL,
EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL));
if (ret != EFI_SUCCESS)
return EFI_INVALID_PARAMETER;
loaded_image_info->load_options = NULL;
loaded_image_info->load_options_size = 0;
if (!env)
goto out;
size = utf8_utf16_strlen(env) + 1;
loaded_image_info->load_options = calloc(size, sizeof(u16));
if (!loaded_image_info->load_options) {
printf("ERROR: Out of memory\n");
EFI_CALL(systab.boottime->close_protocol(handle,
&efi_guid_loaded_image,
efi_root, NULL));
return EFI_OUT_OF_RESOURCES;
}
pos = loaded_image_info->load_options;
utf8_utf16_strcpy(&pos, env);
loaded_image_info->load_options_size = size * 2;
out:
return EFI_CALL(systab.boottime->close_protocol(handle,
&efi_guid_loaded_image,
efi_root, NULL));
}
#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;
/*
* Safe fdt location is at 127 MiB.
* On the sandbox convert from the sandbox address space.
*/
new_fdt_addr = (uintptr_t)map_sysmem(fdt_ram_start + 0x7f00000 +
fdt_size, 0);
ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
EFI_BOOT_SERVICES_DATA, fdt_pages,
&new_fdt_addr);
if (ret != EFI_SUCCESS) {
/* If we can't put it there, put it somewhere */
new_fdt_addr = (ulong)memalign(EFI_PAGE_SIZE, fdt_size);
ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
EFI_BOOT_SERVICES_DATA, fdt_pages,
&new_fdt_addr);
if (ret != EFI_SUCCESS) {
printf("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;
}
/**
* efi_carve_out_dt_rsv() - Carve out DT reserved memory ranges
*
* The mem_rsv entries of the FDT are added to the memory map. Any failures are
* ignored because this is not critical and we would rather continue to try to
* boot.
*
* @fdt: Pointer to device tree
*/
static void efi_carve_out_dt_rsv(void *fdt)
{
int nr_rsv, i;
uint64_t addr, size, pages;
nr_rsv = fdt_num_mem_rsv(fdt);
/* Look for an existing entry and add it to the efi mem map. */
for (i = 0; i < nr_rsv; i++) {
if (fdt_get_mem_rsv(fdt, i, &addr, &size) != 0)
continue;
/* Convert from sandbox address space. */
addr = (uintptr_t)map_sysmem(addr, 0);
pages = efi_size_in_pages(size + (addr & EFI_PAGE_MASK));
addr &= ~EFI_PAGE_MASK;
if (efi_add_memory_map(addr, pages, EFI_RESERVED_MEMORY_TYPE,
false) != EFI_SUCCESS)
printf("FDT memrsv map %d: Failed to add to map\n", i);
}
}
/**
* 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 fdt passed by a command argument
*
* If fdt_opt is available, 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 fdtcontroladdr will be used.
*
* On architectures (x86) using ACPI tables device trees shall not be installed
* as configuration table.
*
* @fdt_opt: pointer to argument
* Return: status code
*/
static efi_status_t efi_install_fdt(const char *fdt_opt)
{
/*
* 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_opt) {
printf("ERROR: can't have ACPI table and device tree.\n");
return EFI_LOAD_ERROR;
}
#else
unsigned long fdt_addr;
void *fdt;
bootm_headers_t img = { 0 };
efi_status_t ret;
if (fdt_opt) {
fdt_addr = simple_strtoul(fdt_opt, NULL, 16);
if (!fdt_addr)
return EFI_INVALID_PARAMETER;
} else {
/* Look for device tree that is already installed */
if (get_config_table(&efi_guid_fdt))
return EFI_SUCCESS;
/* Use our own device tree as default */
fdt_opt = env_get("fdtcontroladdr");
if (!fdt_opt) {
printf("ERROR: need device tree\n");
return EFI_NOT_FOUND;
}
fdt_addr = simple_strtoul(fdt_opt, NULL, 16);
if (!fdt_addr) {
printf("ERROR: invalid $fdtcontroladdr\n");
return EFI_LOAD_ERROR;
}
}
/* Install device tree */
fdt = map_sysmem(fdt_addr, 0);
if (fdt_check_header(fdt)) {
printf("ERROR: invalid device tree\n");
return EFI_LOAD_ERROR;
}
/* Create memory reservations as indicated by the device tree */
efi_carve_out_dt_rsv(fdt);
/* Prepare device tree for payload */
ret = copy_fdt(&fdt);
if (ret) {
printf("ERROR: out of memory\n");
return EFI_OUT_OF_RESOURCES;
}
if (image_setup_libfdt(&img, fdt, 0, NULL)) {
printf("ERROR: failed to process device tree\n");
return EFI_LOAD_ERROR;
}
/* Install device tree as UEFI table */
ret = efi_install_configuration_table(&efi_guid_fdt, fdt);
if (ret != EFI_SUCCESS) {
printf("ERROR: failed to install device tree\n");
return ret;
}
#endif /* GENERATE_ACPI_TABLE */
return EFI_SUCCESS;
}
/**
* do_bootefi_exec() - execute EFI binary
*
* @handle: handle of loaded image
* 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)
{
efi_status_t ret;
efi_uintn_t exit_data_size = 0;
u16 *exit_data = NULL;
/* Transfer environment variable as load options */
ret = set_load_options(handle, "bootargs");
if (ret != EFI_SUCCESS)
return ret;
/* Call our payload! */
ret = EFI_CALL(efi_start_image(handle, &exit_data_size, &exit_data));
printf("## Application terminated, r = %lu\n", ret & ~EFI_ERROR_MASK);
if (ret && exit_data) {
printf("## %ls\n", exit_data);
efi_free_pool(exit_data);
}
efi_restore_gd();
/*
* FIXME: Who is responsible for
* free(loaded_image_info->load_options);
* Once efi_exit() is implemented correctly,
* handle itself doesn't exist here.
*/
return ret;
}
/**
* do_efibootmgr() - execute EFI boot manager
*
* Return: status code
*/
static int do_efibootmgr(void)
{
efi_handle_t handle;
efi_status_t ret;
ret = efi_bootmgr_load(&handle);
if (ret != EFI_SUCCESS) {
printf("EFI boot manager: Cannot load any image\n");
return CMD_RET_FAILURE;
}
ret = do_bootefi_exec(handle);
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 of image start address
* Return: status code
*/
static int do_bootefi_image(const char *image_opt)
{
void *image_buf;
struct efi_device_path *device_path, *image_path;
struct efi_device_path *file_path = NULL;
unsigned long addr, size;
const char *size_str;
efi_handle_t mem_handle = NULL, handle;
efi_status_t ret;
#ifdef CONFIG_CMD_BOOTEFI_HELLO
if (!strcmp(image_opt, "hello")) {
char *saddr;
saddr = env_get("loadaddr");
size = __efi_helloworld_end - __efi_helloworld_begin;
if (saddr)
addr = simple_strtoul(saddr, NULL, 16);
else
addr = CONFIG_SYS_LOAD_ADDR;
image_buf = map_sysmem(addr, size);
memcpy(image_buf, __efi_helloworld_begin, size);
device_path = NULL;
image_path = NULL;
} else
#endif
{
size_str = env_get("filesize");
if (size_str)
size = simple_strtoul(size_str, NULL, 16);
else
size = 0;
addr = simple_strtoul(image_opt, NULL, 16);
/* Check that a numeric value was passed */
if (!addr && *image_opt != '0')
return CMD_RET_USAGE;
image_buf = map_sysmem(addr, size);
device_path = bootefi_device_path;
image_path = bootefi_image_path;
}
if (!device_path && !image_path) {
/*
* 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)image_buf, size);
/*
* Make sure that device for device_path exist
* in load_image(). Otherwise, shell and grub will fail.
*/
ret = efi_create_handle(&mem_handle);
if (ret != EFI_SUCCESS)
goto out;
ret = efi_add_protocol(mem_handle, &efi_guid_device_path,
file_path);
if (ret != EFI_SUCCESS)
goto out;
} else {
assert(device_path && image_path);
file_path = efi_dp_append(device_path, image_path);
}
ret = EFI_CALL(efi_load_image(false, efi_root,
file_path, image_buf, size, &handle));
if (ret != EFI_SUCCESS)
goto out;
ret = do_bootefi_exec(handle);
out:
if (mem_handle)
efi_delete_handle(mem_handle);
if (file_path)
efi_free_pool(file_path);
if (ret != EFI_SUCCESS)
return CMD_RET_FAILURE;
return CMD_RET_SUCCESS;
}
#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;
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 set_load_options((efi_handle_t)*image_objp, load_options_path);
}
/**
* 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;
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;
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;
}
ret = efi_install_fdt(argc > 2 ? argv[2] : NULL);
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;
}
}