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/*
* EFI application loader
*
* Copyright (c) 2016 Alexander Graf
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <command.h>
#include <efi_loader.h>
#include <errno.h>
#include <libfdt.h>
#include <libfdt_env.h>
/*
* When booting using the "bootefi" command, we don't know which
* physical device the file came from. So we create a pseudo-device
* called "bootefi" with the device path /bootefi.
*
* In addition to the originating device we also declare the file path
* of "bootefi" based loads to be /bootefi.
*/
static struct efi_device_path_file_path bootefi_dummy_path[] = {
{
.dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE,
.dp.sub_type = DEVICE_PATH_SUB_TYPE_FILE_PATH,
.dp.length = sizeof(bootefi_dummy_path[0]),
.str = { 'b','o','o','t','e','f','i' },
}, {
.dp.type = DEVICE_PATH_TYPE_END,
.dp.sub_type = DEVICE_PATH_SUB_TYPE_END,
.dp.length = sizeof(bootefi_dummy_path[0]),
}
};
static efi_status_t bootefi_open_dp(void *handle, efi_guid_t *protocol,
void **protocol_interface, void *agent_handle,
void *controller_handle, uint32_t attributes)
{
*protocol_interface = bootefi_dummy_path;
return EFI_SUCCESS;
}
/* The EFI loaded_image interface for the image executed via "bootefi" */
static struct efi_loaded_image loaded_image_info = {
.device_handle = bootefi_dummy_path,
.file_path = bootefi_dummy_path,
};
/* The EFI object struct for the image executed via "bootefi" */
static struct efi_object loaded_image_info_obj = {
.handle = &loaded_image_info,
.protocols = {
{
/*
* When asking for the loaded_image interface, just
* return handle which points to loaded_image_info
*/
.guid = &efi_guid_loaded_image,
.open = &efi_return_handle,
},
{
/*
* When asking for the device path interface, return
* bootefi_dummy_path
*/
.guid = &efi_guid_device_path,
.open = &bootefi_open_dp,
},
},
};
/* The EFI object struct for the device the "bootefi" image was loaded from */
static struct efi_object bootefi_device_obj = {
.handle = bootefi_dummy_path,
.protocols = {
{
/* When asking for the device path interface, return
* bootefi_dummy_path */
.guid = &efi_guid_device_path,
.open = &bootefi_open_dp,
}
},
};
/*
* Load an EFI payload into a newly allocated piece of memory, register all
* EFI objects it would want to access and jump to it.
*/
static unsigned long do_bootefi_exec(void *efi)
{
ulong (*entry)(void *image_handle, struct efi_system_table *st);
ulong fdt_pages, fdt_size, fdt_start, fdt_end;
bootm_headers_t img = { 0 };
/*
* gd lives in a fixed register which may get clobbered while we execute
* the payload. So save it here and restore it on every callback entry
*/
efi_save_gd();
/* Update system table to point to our currently loaded FDT */
if (working_fdt) {
/* Prepare fdt for payload */
if (image_setup_libfdt(&img, working_fdt, 0, NULL)) {
printf("ERROR: Failed to process device tree\n");
return -EINVAL;
}
/* Link to it in the efi tables */
systab.tables[0].guid = EFI_FDT_GUID;
systab.tables[0].table = working_fdt;
systab.nr_tables = 1;
/* And reserve the space in the memory map */
fdt_start = ((ulong)working_fdt) & ~EFI_PAGE_MASK;
fdt_end = ((ulong)working_fdt) + fdt_totalsize(working_fdt);
fdt_size = (fdt_end - fdt_start) + EFI_PAGE_MASK;
fdt_pages = fdt_size >> EFI_PAGE_SHIFT;
/* Give a bootloader the chance to modify the device tree */
fdt_pages += 2;
efi_add_memory_map(fdt_start, fdt_pages,
EFI_BOOT_SERVICES_DATA, true);
} else {
printf("WARNING: No device tree loaded, expect boot to fail\n");
systab.nr_tables = 0;
}
/* Load the EFI payload */
entry = efi_load_pe(efi, &loaded_image_info);
if (!entry)
return -ENOENT;
/* Initialize and populate EFI object list */
INIT_LIST_HEAD(&efi_obj_list);
list_add_tail(&loaded_image_info_obj.link, &efi_obj_list);
list_add_tail(&bootefi_device_obj.link, &efi_obj_list);
#ifdef CONFIG_PARTITIONS
efi_disk_register();
#endif
/* Call our payload! */
#ifdef DEBUG_EFI
printf("%s:%d Jumping to 0x%lx\n", __func__, __LINE__, (long)entry);
#endif
return entry(&loaded_image_info, &systab);
}
/* Interpreter command to boot an arbitrary EFI image from memory */
static int do_bootefi(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
char *saddr;
unsigned long addr;
int r = 0;
if (argc < 2)
return 1;
saddr = argv[1];
addr = simple_strtoul(saddr, NULL, 16);
printf("## Starting EFI application at 0x%08lx ...\n", addr);
r = do_bootefi_exec((void *)addr);
printf("## Application terminated, r = %d\n", r);
if (r != 0)
r = 1;
return r;
}
#ifdef CONFIG_SYS_LONGHELP
static char bootefi_help_text[] =
"<image address>\n"
" - boot EFI payload stored at address <image address>\n"
"\n"
"Since most EFI payloads want to have a device tree provided, please\n"
"make sure you load a device tree using the fdt addr command before\n"
"executing bootefi.\n";
#endif
U_BOOT_CMD(
bootefi, 2, 0, do_bootefi,
"Boots an EFI payload from memory\n",
bootefi_help_text
);
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