2 * EFI application loader
4 * Copyright (c) 2016 Alexander Graf
6 * SPDX-License-Identifier: GPL-2.0+
11 #include <efi_loader.h>
14 #include <libfdt_env.h>
17 * When booting using the "bootefi" command, we don't know which
18 * physical device the file came from. So we create a pseudo-device
19 * called "bootefi" with the device path /bootefi.
21 * In addition to the originating device we also declare the file path
22 * of "bootefi" based loads to be /bootefi.
24 static struct efi_device_path_file_path bootefi_image_path
[] = {
26 .dp
.type
= DEVICE_PATH_TYPE_MEDIA_DEVICE
,
27 .dp
.sub_type
= DEVICE_PATH_SUB_TYPE_FILE_PATH
,
28 .dp
.length
= sizeof(bootefi_image_path
[0]),
29 .str
= { 'b','o','o','t','e','f','i' },
31 .dp
.type
= DEVICE_PATH_TYPE_END
,
32 .dp
.sub_type
= DEVICE_PATH_SUB_TYPE_END
,
33 .dp
.length
= sizeof(bootefi_image_path
[0]),
37 static struct efi_device_path_file_path bootefi_device_path
[] = {
39 .dp
.type
= DEVICE_PATH_TYPE_MEDIA_DEVICE
,
40 .dp
.sub_type
= DEVICE_PATH_SUB_TYPE_FILE_PATH
,
41 .dp
.length
= sizeof(bootefi_image_path
[0]),
42 .str
= { 'b','o','o','t','e','f','i' },
44 .dp
.type
= DEVICE_PATH_TYPE_END
,
45 .dp
.sub_type
= DEVICE_PATH_SUB_TYPE_END
,
46 .dp
.length
= sizeof(bootefi_image_path
[0]),
50 static efi_status_t
bootefi_open_dp(void *handle
, efi_guid_t
*protocol
,
51 void **protocol_interface
, void *agent_handle
,
52 void *controller_handle
, uint32_t attributes
)
54 *protocol_interface
= bootefi_device_path
;
58 /* The EFI loaded_image interface for the image executed via "bootefi" */
59 static struct efi_loaded_image loaded_image_info
= {
60 .device_handle
= bootefi_device_path
,
61 .file_path
= bootefi_image_path
,
64 /* The EFI object struct for the image executed via "bootefi" */
65 static struct efi_object loaded_image_info_obj
= {
66 .handle
= &loaded_image_info
,
70 * When asking for the loaded_image interface, just
71 * return handle which points to loaded_image_info
73 .guid
= &efi_guid_loaded_image
,
74 .open
= &efi_return_handle
,
78 * When asking for the device path interface, return
81 .guid
= &efi_guid_device_path
,
82 .open
= &bootefi_open_dp
,
87 /* The EFI object struct for the device the "bootefi" image was loaded from */
88 static struct efi_object bootefi_device_obj
= {
89 .handle
= bootefi_device_path
,
92 /* When asking for the device path interface, return
93 * bootefi_device_path */
94 .guid
= &efi_guid_device_path
,
95 .open
= &bootefi_open_dp
,
101 * Load an EFI payload into a newly allocated piece of memory, register all
102 * EFI objects it would want to access and jump to it.
104 static unsigned long do_bootefi_exec(void *efi
)
106 ulong (*entry
)(void *image_handle
, struct efi_system_table
*st
);
107 ulong fdt_pages
, fdt_size
, fdt_start
, fdt_end
;
108 bootm_headers_t img
= { 0 };
111 * gd lives in a fixed register which may get clobbered while we execute
112 * the payload. So save it here and restore it on every callback entry
116 /* Update system table to point to our currently loaded FDT */
119 /* Prepare fdt for payload */
120 if (image_setup_libfdt(&img
, working_fdt
, 0, NULL
)) {
121 printf("ERROR: Failed to process device tree\n");
125 /* Link to it in the efi tables */
126 systab
.tables
[0].guid
= EFI_FDT_GUID
;
127 systab
.tables
[0].table
= working_fdt
;
128 systab
.nr_tables
= 1;
130 /* And reserve the space in the memory map */
131 fdt_start
= ((ulong
)working_fdt
) & ~EFI_PAGE_MASK
;
132 fdt_end
= ((ulong
)working_fdt
) + fdt_totalsize(working_fdt
);
133 fdt_size
= (fdt_end
- fdt_start
) + EFI_PAGE_MASK
;
134 fdt_pages
= fdt_size
>> EFI_PAGE_SHIFT
;
135 /* Give a bootloader the chance to modify the device tree */
137 efi_add_memory_map(fdt_start
, fdt_pages
,
138 EFI_BOOT_SERVICES_DATA
, true);
141 printf("WARNING: No device tree loaded, expect boot to fail\n");
142 systab
.nr_tables
= 0;
145 /* Load the EFI payload */
146 entry
= efi_load_pe(efi
, &loaded_image_info
);
150 /* Initialize and populate EFI object list */
151 INIT_LIST_HEAD(&efi_obj_list
);
152 list_add_tail(&loaded_image_info_obj
.link
, &efi_obj_list
);
153 list_add_tail(&bootefi_device_obj
.link
, &efi_obj_list
);
154 #ifdef CONFIG_PARTITIONS
161 /* Call our payload! */
163 printf("%s:%d Jumping to 0x%lx\n", __func__
, __LINE__
, (long)entry
);
165 return entry(&loaded_image_info
, &systab
);
169 /* Interpreter command to boot an arbitrary EFI image from memory */
170 static int do_bootefi(cmd_tbl_t
*cmdtp
, int flag
, int argc
, char * const argv
[])
180 addr
= simple_strtoul(saddr
, NULL
, 16);
182 printf("## Starting EFI application at 0x%08lx ...\n", addr
);
183 r
= do_bootefi_exec((void *)addr
);
184 printf("## Application terminated, r = %d\n", r
);
192 #ifdef CONFIG_SYS_LONGHELP
193 static char bootefi_help_text
[] =
195 " - boot EFI payload stored at address <image address>\n"
197 "Since most EFI payloads want to have a device tree provided, please\n"
198 "make sure you load a device tree using the fdt addr command before\n"
199 "executing bootefi.\n";
203 bootefi
, 2, 0, do_bootefi
,
204 "Boots an EFI payload from memory\n",
208 void efi_set_bootdev(const char *dev
, const char *devnr
, const char *path
)
210 __maybe_unused
struct blk_desc
*desc
;
211 char devname
[32] = { 0 }; /* dp->str is u16[32] long */
214 /* Assemble the condensed device name we use in efi_disk.c */
215 snprintf(devname
, sizeof(devname
), "%s%s", dev
, devnr
);
216 colon
= strchr(devname
, ':');
218 #ifdef CONFIG_ISO_PARTITION
219 /* For ISOs we create partition block devices */
220 desc
= blk_get_dev(dev
, simple_strtol(devnr
, NULL
, 10));
221 if (desc
&& (desc
->type
!= DEV_TYPE_UNKNOWN
) &&
222 (desc
->part_type
== PART_TYPE_ISO
)) {
224 snprintf(devname
, sizeof(devname
), "%s%s:1", dev
,
233 /* Patch bootefi_device_path to the target device */
234 memset(bootefi_device_path
[0].str
, 0, sizeof(bootefi_device_path
[0].str
));
235 ascii2unicode(bootefi_device_path
[0].str
, devname
);
237 /* Patch bootefi_image_path to the target file path */
238 memset(bootefi_image_path
[0].str
, 0, sizeof(bootefi_image_path
[0].str
));
239 snprintf(devname
, sizeof(devname
), "%s", path
);
240 ascii2unicode(bootefi_image_path
[0].str
, devname
);