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// SPDX-License-Identifier: GPL-2.0+
/*
* For the code moved from cmd/bootefi.c
* Copyright (c) 2016 Alexander Graf
*/
#define LOG_CATEGORY LOGC_EFI
#include <charset.h>
#include <efi.h>
#include <efi_loader.h>
#include <env.h>
#include <image.h>
#include <log.h>
#include <malloc.h>
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
*/
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_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;
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_concat(bootefi_device_path,
bootefi_image_path, 0);
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:
if (mem_handle) {
efi_status_t r;
r = efi_uninstall_multiple_protocol_interfaces(
mem_handle, &efi_guid_device_path, file_path, NULL);
if (r != EFI_SUCCESS)
log_err("Uninstalling protocol interfaces failed\n");
}
efi_free_pool(file_path);
return ret;
}
/**
* efi_binary_run() - run loaded UEFI image
*
* @image: memory address of the UEFI image
* @size: size of the UEFI image
* @fdt: device-tree
*
* Execute an EFI binary image loaded at @image.
* @size may be zero if the binary is loaded with U-Boot load command.
*
* Return: status code
*/
efi_status_t efi_binary_run(void *image, size_t size, void *fdt)
{
efi_status_t ret;
/* 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 -1;
}
ret = efi_install_fdt(fdt);
if (ret != EFI_SUCCESS)
return ret;
return efi_run_image(image, size);
}
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