u-boot/cmd/bootefi.c

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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 <dm/device.h>
#include <efi_loader.h>
#include <errno.h>
#include <libfdt.h>
#include <libfdt_env.h>
#include <memalign.h>
#include <asm/global_data.h>
#include <asm-generic/sections.h>
#include <linux/linkage.h>
DECLARE_GLOBAL_DATA_PTR;
/*
* 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_image_path[] = {
{
.dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE,
.dp.sub_type = DEVICE_PATH_SUB_TYPE_FILE_PATH,
.dp.length = sizeof(bootefi_image_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_image_path[0]),
}
};
static struct efi_device_path_file_path bootefi_device_path[] = {
{
.dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE,
.dp.sub_type = DEVICE_PATH_SUB_TYPE_FILE_PATH,
.dp.length = sizeof(bootefi_image_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_image_path[0]),
}
};
static efi_status_t EFIAPI bootefi_open_dp(void *handle, efi_guid_t *protocol,
void **protocol_interface, void *agent_handle,
void *controller_handle, uint32_t attributes)
{
*protocol_interface = bootefi_device_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_device_path,
.file_path = bootefi_image_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_device_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_device_path,
.protocols = {
{
/* When asking for the device path interface, return
* bootefi_device_path */
.guid = &efi_guid_device_path,
.open = &bootefi_open_dp,
}
},
};
static void *copy_fdt(void *fdt)
{
u64 fdt_size = fdt_totalsize(fdt);
unsigned long fdt_ram_start = -1L, fdt_pages;
u64 new_fdt_addr;
void *new_fdt;
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 4kb breathing room */
fdt_size = ALIGN(fdt_size + 4096, 4096);
fdt_pages = fdt_size >> EFI_PAGE_SHIFT;
/* Safe fdt location is at 128MB */
new_fdt_addr = fdt_ram_start + (128 * 1024 * 1024) + fdt_size;
if (efi_allocate_pages(1, EFI_BOOT_SERVICES_DATA, fdt_pages,
&new_fdt_addr) != EFI_SUCCESS) {
/* If we can't put it there, put it somewhere */
new_fdt_addr = (ulong)memalign(4096, fdt_size);
}
new_fdt = (void*)(ulong)new_fdt_addr;
memcpy(new_fdt, fdt, fdt_totalsize(fdt));
fdt_set_totalsize(new_fdt, fdt_size);
return new_fdt;
}
/*
* 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, void *fdt)
{
ulong (*entry)(void *image_handle, struct efi_system_table *st)
asmlinkage;
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();
if (fdt && !fdt_check_header(fdt)) {
/* Prepare fdt for payload */
fdt = copy_fdt(fdt);
if (image_setup_libfdt(&img, 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 = fdt;
systab.nr_tables = 1;
/* And reserve the space in the memory map */
fdt_start = ((ulong)fdt) & ~EFI_PAGE_MASK;
fdt_end = ((ulong)fdt) + fdt_totalsize(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: Invalid device tree, 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
#ifdef CONFIG_LCD
efi_gop_register();
#endif
#ifdef CONFIG_NET
void *nethandle = loaded_image_info.device_handle;
efi_net_register(&nethandle);
if (!memcmp(bootefi_device_path[0].str, "N\0e\0t", 6))
loaded_image_info.device_handle = nethandle;
else
loaded_image_info.device_handle = bootefi_device_path;
#endif
#ifdef CONFIG_GENERATE_SMBIOS_TABLE
efi_smbios_register();
#endif
/* Initialize EFI runtime services */
efi_reset_system_init();
efi_get_time_init();
/* Call our payload! */
debug("%s:%d Jumping to 0x%lx\n", __func__, __LINE__, (long)entry);
if (setjmp(&loaded_image_info.exit_jmp)) {
efi_status_t status = loaded_image_info.exit_status;
return status == EFI_SUCCESS ? 0 : -EINVAL;
}
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, *sfdt;
unsigned long addr, fdt_addr = 0;
int r = 0;
if (argc < 2)
return CMD_RET_USAGE;
saddr = argv[1];
addr = simple_strtoul(saddr, NULL, 16);
if (argc > 2) {
sfdt = argv[2];
fdt_addr = simple_strtoul(sfdt, NULL, 16);
}
printf("## Starting EFI application at 0x%08lx ...\n", addr);
r = do_bootefi_exec((void *)addr, (void*)fdt_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> [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";
#endif
U_BOOT_CMD(
bootefi, 3, 0, do_bootefi,
"Boots an EFI payload from memory",
bootefi_help_text
);
void efi_set_bootdev(const char *dev, const char *devnr, const char *path)
{
__maybe_unused struct blk_desc *desc;
char devname[32] = { 0 }; /* dp->str is u16[32] long */
char *colon;
#if defined(CONFIG_BLK) || defined(CONFIG_ISO_PARTITION)
desc = blk_get_dev(dev, simple_strtol(devnr, NULL, 10));
#endif
#ifdef CONFIG_BLK
if (desc) {
snprintf(devname, sizeof(devname), "%s", desc->bdev->name);
} else
#endif
{
/* Assemble the condensed device name we use in efi_disk.c */
snprintf(devname, sizeof(devname), "%s%s", dev, devnr);
}
colon = strchr(devname, ':');
#ifdef CONFIG_ISO_PARTITION
/* For ISOs we create partition block devices */
if (desc && (desc->type != DEV_TYPE_UNKNOWN) &&
(desc->part_type == PART_TYPE_ISO)) {
if (!colon)
snprintf(devname, sizeof(devname), "%s:1", devname);
colon = NULL;
}
#endif
if (colon)
*colon = '\0';
/* Patch bootefi_device_path to the target device */
memset(bootefi_device_path[0].str, 0, sizeof(bootefi_device_path[0].str));
ascii2unicode(bootefi_device_path[0].str, devname);
/* Patch bootefi_image_path to the target file path */
memset(bootefi_image_path[0].str, 0, sizeof(bootefi_image_path[0].str));
if (strcmp(dev, "Net")) {
/* Add leading / to fs paths, because they're absolute */
snprintf(devname, sizeof(devname), "/%s", path);
} else {
snprintf(devname, sizeof(devname), "%s", path);
}
ascii2unicode(bootefi_image_path[0].str, devname);
}