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>
16 #include <asm/global_data.h>
18 DECLARE_GLOBAL_DATA_PTR
;
21 * When booting using the "bootefi" command, we don't know which
22 * physical device the file came from. So we create a pseudo-device
23 * called "bootefi" with the device path /bootefi.
25 * In addition to the originating device we also declare the file path
26 * of "bootefi" based loads to be /bootefi.
28 static struct efi_device_path_file_path bootefi_image_path
[] = {
30 .dp
.type
= DEVICE_PATH_TYPE_MEDIA_DEVICE
,
31 .dp
.sub_type
= DEVICE_PATH_SUB_TYPE_FILE_PATH
,
32 .dp
.length
= sizeof(bootefi_image_path
[0]),
33 .str
= { 'b','o','o','t','e','f','i' },
35 .dp
.type
= DEVICE_PATH_TYPE_END
,
36 .dp
.sub_type
= DEVICE_PATH_SUB_TYPE_END
,
37 .dp
.length
= sizeof(bootefi_image_path
[0]),
41 static struct efi_device_path_file_path bootefi_device_path
[] = {
43 .dp
.type
= DEVICE_PATH_TYPE_MEDIA_DEVICE
,
44 .dp
.sub_type
= DEVICE_PATH_SUB_TYPE_FILE_PATH
,
45 .dp
.length
= sizeof(bootefi_image_path
[0]),
46 .str
= { 'b','o','o','t','e','f','i' },
48 .dp
.type
= DEVICE_PATH_TYPE_END
,
49 .dp
.sub_type
= DEVICE_PATH_SUB_TYPE_END
,
50 .dp
.length
= sizeof(bootefi_image_path
[0]),
54 static efi_status_t
bootefi_open_dp(void *handle
, efi_guid_t
*protocol
,
55 void **protocol_interface
, void *agent_handle
,
56 void *controller_handle
, uint32_t attributes
)
58 *protocol_interface
= bootefi_device_path
;
62 /* The EFI loaded_image interface for the image executed via "bootefi" */
63 static struct efi_loaded_image loaded_image_info
= {
64 .device_handle
= bootefi_device_path
,
65 .file_path
= bootefi_image_path
,
68 /* The EFI object struct for the image executed via "bootefi" */
69 static struct efi_object loaded_image_info_obj
= {
70 .handle
= &loaded_image_info
,
74 * When asking for the loaded_image interface, just
75 * return handle which points to loaded_image_info
77 .guid
= &efi_guid_loaded_image
,
78 .open
= &efi_return_handle
,
82 * When asking for the device path interface, return
85 .guid
= &efi_guid_device_path
,
86 .open
= &bootefi_open_dp
,
91 /* The EFI object struct for the device the "bootefi" image was loaded from */
92 static struct efi_object bootefi_device_obj
= {
93 .handle
= bootefi_device_path
,
96 /* When asking for the device path interface, return
97 * bootefi_device_path */
98 .guid
= &efi_guid_device_path
,
99 .open
= &bootefi_open_dp
,
104 static void *copy_fdt(void *fdt
)
106 u64 fdt_size
= fdt_totalsize(fdt
);
107 unsigned long fdt_ram_start
= -1L, fdt_pages
;
112 for (i
= 0; i
< CONFIG_NR_DRAM_BANKS
; i
++) {
113 u64 ram_start
= gd
->bd
->bi_dram
[i
].start
;
114 u64 ram_size
= gd
->bd
->bi_dram
[i
].size
;
119 if (ram_start
< fdt_ram_start
)
120 fdt_ram_start
= ram_start
;
123 /* Give us at least 4kb breathing room */
124 fdt_size
= ALIGN(fdt_size
+ 4096, 4096);
125 fdt_pages
= fdt_size
>> EFI_PAGE_SHIFT
;
127 /* Safe fdt location is at 128MB */
128 new_fdt_addr
= fdt_ram_start
+ (128 * 1024 * 1024) + fdt_size
;
129 if (efi_allocate_pages(1, EFI_BOOT_SERVICES_DATA
, fdt_pages
,
130 &new_fdt_addr
) != EFI_SUCCESS
) {
131 /* If we can't put it there, put it somewhere */
132 new_fdt_addr
= (ulong
)memalign(4096, fdt_size
);
134 new_fdt
= (void*)(ulong
)new_fdt_addr
;
135 memcpy(new_fdt
, fdt
, fdt_totalsize(fdt
));
136 fdt_set_totalsize(new_fdt
, fdt_size
);
142 * Load an EFI payload into a newly allocated piece of memory, register all
143 * EFI objects it would want to access and jump to it.
145 static unsigned long do_bootefi_exec(void *efi
, void *fdt
)
147 ulong (*entry
)(void *image_handle
, struct efi_system_table
*st
);
148 ulong fdt_pages
, fdt_size
, fdt_start
, fdt_end
;
149 bootm_headers_t img
= { 0 };
152 * gd lives in a fixed register which may get clobbered while we execute
153 * the payload. So save it here and restore it on every callback entry
157 if (fdt
&& !fdt_check_header(fdt
)) {
158 /* Prepare fdt for payload */
161 if (image_setup_libfdt(&img
, fdt
, 0, NULL
)) {
162 printf("ERROR: Failed to process device tree\n");
166 /* Link to it in the efi tables */
167 systab
.tables
[0].guid
= EFI_FDT_GUID
;
168 systab
.tables
[0].table
= fdt
;
169 systab
.nr_tables
= 1;
171 /* And reserve the space in the memory map */
172 fdt_start
= ((ulong
)fdt
) & ~EFI_PAGE_MASK
;
173 fdt_end
= ((ulong
)fdt
) + fdt_totalsize(fdt
);
174 fdt_size
= (fdt_end
- fdt_start
) + EFI_PAGE_MASK
;
175 fdt_pages
= fdt_size
>> EFI_PAGE_SHIFT
;
176 /* Give a bootloader the chance to modify the device tree */
178 efi_add_memory_map(fdt_start
, fdt_pages
,
179 EFI_BOOT_SERVICES_DATA
, true);
181 printf("WARNING: Invalid device tree, expect boot to fail\n");
182 systab
.nr_tables
= 0;
185 /* Load the EFI payload */
186 entry
= efi_load_pe(efi
, &loaded_image_info
);
190 /* Initialize and populate EFI object list */
191 INIT_LIST_HEAD(&efi_obj_list
);
192 list_add_tail(&loaded_image_info_obj
.link
, &efi_obj_list
);
193 list_add_tail(&bootefi_device_obj
.link
, &efi_obj_list
);
194 #ifdef CONFIG_PARTITIONS
201 void *nethandle
= loaded_image_info
.device_handle
;
202 efi_net_register(&nethandle
);
204 if (!memcmp(bootefi_device_path
[0].str
, "N\0e\0t", 6))
205 loaded_image_info
.device_handle
= nethandle
;
208 /* Call our payload! */
210 printf("%s:%d Jumping to 0x%lx\n", __func__
, __LINE__
, (long)entry
);
212 return entry(&loaded_image_info
, &systab
);
216 /* Interpreter command to boot an arbitrary EFI image from memory */
217 static int do_bootefi(cmd_tbl_t
*cmdtp
, int flag
, int argc
, char * const argv
[])
220 unsigned long addr
, fdt_addr
= 0;
227 addr
= simple_strtoul(saddr
, NULL
, 16);
231 fdt_addr
= simple_strtoul(sfdt
, NULL
, 16);
234 printf("## Starting EFI application at 0x%08lx ...\n", addr
);
235 r
= do_bootefi_exec((void *)addr
, (void*)fdt_addr
);
236 printf("## Application terminated, r = %d\n", r
);
244 #ifdef CONFIG_SYS_LONGHELP
245 static char bootefi_help_text
[] =
246 "<image address> [fdt address]\n"
247 " - boot EFI payload stored at address <image address>.\n"
248 " If specified, the device tree located at <fdt address> gets\n"
249 " exposed as EFI configuration table.\n";
253 bootefi
, 3, 0, do_bootefi
,
254 "Boots an EFI payload from memory\n",
258 void efi_set_bootdev(const char *dev
, const char *devnr
, const char *path
)
260 __maybe_unused
struct blk_desc
*desc
;
261 char devname
[32] = { 0 }; /* dp->str is u16[32] long */
264 /* Assemble the condensed device name we use in efi_disk.c */
265 snprintf(devname
, sizeof(devname
), "%s%s", dev
, devnr
);
266 colon
= strchr(devname
, ':');
268 #ifdef CONFIG_ISO_PARTITION
269 /* For ISOs we create partition block devices */
270 desc
= blk_get_dev(dev
, simple_strtol(devnr
, NULL
, 10));
271 if (desc
&& (desc
->type
!= DEV_TYPE_UNKNOWN
) &&
272 (desc
->part_type
== PART_TYPE_ISO
)) {
274 snprintf(devname
, sizeof(devname
), "%s%s:1", dev
,
283 /* Patch bootefi_device_path to the target device */
284 memset(bootefi_device_path
[0].str
, 0, sizeof(bootefi_device_path
[0].str
));
285 ascii2unicode(bootefi_device_path
[0].str
, devname
);
287 /* Patch bootefi_image_path to the target file path */
288 memset(bootefi_image_path
[0].str
, 0, sizeof(bootefi_image_path
[0].str
));
289 snprintf(devname
, sizeof(devname
), "%s", path
);
290 ascii2unicode(bootefi_image_path
[0].str
, devname
);