2 * EFI application loader
4 * Copyright (c) 2016 Alexander Graf
6 * SPDX-License-Identifier: GPL-2.0+
11 #include <dm/device.h>
12 #include <efi_loader.h>
15 #include <libfdt_env.h>
17 #include <asm/global_data.h>
18 #include <asm-generic/sections.h>
19 #include <linux/linkage.h>
21 DECLARE_GLOBAL_DATA_PTR
;
24 * When booting using the "bootefi" command, we don't know which
25 * physical device the file came from. So we create a pseudo-device
26 * called "bootefi" with the device path /bootefi.
28 * In addition to the originating device we also declare the file path
29 * of "bootefi" based loads to be /bootefi.
31 static struct efi_device_path_file_path bootefi_image_path
[] = {
33 .dp
.type
= DEVICE_PATH_TYPE_MEDIA_DEVICE
,
34 .dp
.sub_type
= DEVICE_PATH_SUB_TYPE_FILE_PATH
,
35 .dp
.length
= sizeof(bootefi_image_path
[0]),
36 .str
= { 'b','o','o','t','e','f','i' },
38 .dp
.type
= DEVICE_PATH_TYPE_END
,
39 .dp
.sub_type
= DEVICE_PATH_SUB_TYPE_END
,
40 .dp
.length
= sizeof(bootefi_image_path
[0]),
44 static struct efi_device_path_file_path bootefi_device_path
[] = {
46 .dp
.type
= DEVICE_PATH_TYPE_MEDIA_DEVICE
,
47 .dp
.sub_type
= DEVICE_PATH_SUB_TYPE_FILE_PATH
,
48 .dp
.length
= sizeof(bootefi_image_path
[0]),
49 .str
= { 'b','o','o','t','e','f','i' },
51 .dp
.type
= DEVICE_PATH_TYPE_END
,
52 .dp
.sub_type
= DEVICE_PATH_SUB_TYPE_END
,
53 .dp
.length
= sizeof(bootefi_image_path
[0]),
57 static efi_status_t EFIAPI
bootefi_open_dp(void *handle
, efi_guid_t
*protocol
,
58 void **protocol_interface
, void *agent_handle
,
59 void *controller_handle
, uint32_t attributes
)
61 *protocol_interface
= bootefi_device_path
;
65 /* The EFI loaded_image interface for the image executed via "bootefi" */
66 static struct efi_loaded_image loaded_image_info
= {
67 .device_handle
= bootefi_device_path
,
68 .file_path
= bootefi_image_path
,
71 /* The EFI object struct for the image executed via "bootefi" */
72 static struct efi_object loaded_image_info_obj
= {
73 .handle
= &loaded_image_info
,
77 * When asking for the loaded_image interface, just
78 * return handle which points to loaded_image_info
80 .guid
= &efi_guid_loaded_image
,
81 .open
= &efi_return_handle
,
85 * When asking for the device path interface, return
88 .guid
= &efi_guid_device_path
,
89 .open
= &bootefi_open_dp
,
94 /* The EFI object struct for the device the "bootefi" image was loaded from */
95 static struct efi_object bootefi_device_obj
= {
96 .handle
= bootefi_device_path
,
99 /* When asking for the device path interface, return
100 * bootefi_device_path */
101 .guid
= &efi_guid_device_path
,
102 .open
= &bootefi_open_dp
,
107 static void *copy_fdt(void *fdt
)
109 u64 fdt_size
= fdt_totalsize(fdt
);
110 unsigned long fdt_ram_start
= -1L, fdt_pages
;
115 for (i
= 0; i
< CONFIG_NR_DRAM_BANKS
; i
++) {
116 u64 ram_start
= gd
->bd
->bi_dram
[i
].start
;
117 u64 ram_size
= gd
->bd
->bi_dram
[i
].size
;
122 if (ram_start
< fdt_ram_start
)
123 fdt_ram_start
= ram_start
;
126 /* Give us at least 4kb breathing room */
127 fdt_size
= ALIGN(fdt_size
+ 4096, 4096);
128 fdt_pages
= fdt_size
>> EFI_PAGE_SHIFT
;
130 /* Safe fdt location is at 128MB */
131 new_fdt_addr
= fdt_ram_start
+ (128 * 1024 * 1024) + fdt_size
;
132 if (efi_allocate_pages(1, EFI_BOOT_SERVICES_DATA
, fdt_pages
,
133 &new_fdt_addr
) != EFI_SUCCESS
) {
134 /* If we can't put it there, put it somewhere */
135 new_fdt_addr
= (ulong
)memalign(4096, fdt_size
);
137 new_fdt
= (void*)(ulong
)new_fdt_addr
;
138 memcpy(new_fdt
, fdt
, fdt_totalsize(fdt
));
139 fdt_set_totalsize(new_fdt
, fdt_size
);
145 * Load an EFI payload into a newly allocated piece of memory, register all
146 * EFI objects it would want to access and jump to it.
148 static unsigned long do_bootefi_exec(void *efi
, void *fdt
)
150 ulong (*entry
)(void *image_handle
, struct efi_system_table
*st
)
152 ulong fdt_pages
, fdt_size
, fdt_start
, fdt_end
;
153 bootm_headers_t img
= { 0 };
156 * gd lives in a fixed register which may get clobbered while we execute
157 * the payload. So save it here and restore it on every callback entry
161 if (fdt
&& !fdt_check_header(fdt
)) {
162 /* Prepare fdt for payload */
165 if (image_setup_libfdt(&img
, fdt
, 0, NULL
)) {
166 printf("ERROR: Failed to process device tree\n");
170 /* Link to it in the efi tables */
171 systab
.tables
[0].guid
= EFI_FDT_GUID
;
172 systab
.tables
[0].table
= fdt
;
173 systab
.nr_tables
= 1;
175 /* And reserve the space in the memory map */
176 fdt_start
= ((ulong
)fdt
) & ~EFI_PAGE_MASK
;
177 fdt_end
= ((ulong
)fdt
) + fdt_totalsize(fdt
);
178 fdt_size
= (fdt_end
- fdt_start
) + EFI_PAGE_MASK
;
179 fdt_pages
= fdt_size
>> EFI_PAGE_SHIFT
;
180 /* Give a bootloader the chance to modify the device tree */
182 efi_add_memory_map(fdt_start
, fdt_pages
,
183 EFI_BOOT_SERVICES_DATA
, true);
185 printf("WARNING: Invalid device tree, expect boot to fail\n");
186 systab
.nr_tables
= 0;
189 /* Load the EFI payload */
190 entry
= efi_load_pe(efi
, &loaded_image_info
);
194 /* Initialize and populate EFI object list */
195 INIT_LIST_HEAD(&efi_obj_list
);
196 list_add_tail(&loaded_image_info_obj
.link
, &efi_obj_list
);
197 list_add_tail(&bootefi_device_obj
.link
, &efi_obj_list
);
198 #ifdef CONFIG_PARTITIONS
205 void *nethandle
= loaded_image_info
.device_handle
;
206 efi_net_register(&nethandle
);
208 if (!memcmp(bootefi_device_path
[0].str
, "N\0e\0t", 6))
209 loaded_image_info
.device_handle
= nethandle
;
211 loaded_image_info
.device_handle
= bootefi_device_path
;
213 #ifdef CONFIG_GENERATE_SMBIOS_TABLE
214 efi_smbios_register();
217 /* Initialize EFI runtime services */
218 efi_reset_system_init();
221 /* Call our payload! */
222 debug("%s:%d Jumping to 0x%lx\n", __func__
, __LINE__
, (long)entry
);
224 if (setjmp(&loaded_image_info
.exit_jmp
)) {
225 efi_status_t status
= loaded_image_info
.exit_status
;
226 return status
== EFI_SUCCESS
? 0 : -EINVAL
;
229 return entry(&loaded_image_info
, &systab
);
233 /* Interpreter command to boot an arbitrary EFI image from memory */
234 static int do_bootefi(cmd_tbl_t
*cmdtp
, int flag
, int argc
, char * const argv
[])
237 unsigned long addr
, fdt_addr
= 0;
241 return CMD_RET_USAGE
;
244 addr
= simple_strtoul(saddr
, NULL
, 16);
248 fdt_addr
= simple_strtoul(sfdt
, NULL
, 16);
251 printf("## Starting EFI application at %08lx ...\n", addr
);
252 r
= do_bootefi_exec((void *)addr
, (void*)fdt_addr
);
253 printf("## Application terminated, r = %d\n", r
);
261 #ifdef CONFIG_SYS_LONGHELP
262 static char bootefi_help_text
[] =
263 "<image address> [fdt address]\n"
264 " - boot EFI payload stored at address <image address>.\n"
265 " If specified, the device tree located at <fdt address> gets\n"
266 " exposed as EFI configuration table.\n";
270 bootefi
, 3, 0, do_bootefi
,
271 "Boots an EFI payload from memory",
275 void efi_set_bootdev(const char *dev
, const char *devnr
, const char *path
)
277 __maybe_unused
struct blk_desc
*desc
;
278 char devname
[32] = { 0 }; /* dp->str is u16[32] long */
281 #if defined(CONFIG_BLK) || defined(CONFIG_ISO_PARTITION)
282 desc
= blk_get_dev(dev
, simple_strtol(devnr
, NULL
, 10));
287 snprintf(devname
, sizeof(devname
), "%s", desc
->bdev
->name
);
292 /* Assemble the condensed device name we use in efi_disk.c */
293 snprintf(devname
, sizeof(devname
), "%s%s", dev
, devnr
);
296 colon
= strchr(devname
, ':');
298 #ifdef CONFIG_ISO_PARTITION
299 /* For ISOs we create partition block devices */
300 if (desc
&& (desc
->type
!= DEV_TYPE_UNKNOWN
) &&
301 (desc
->part_type
== PART_TYPE_ISO
)) {
303 snprintf(devname
, sizeof(devname
), "%s:1", devname
);
312 /* Patch bootefi_device_path to the target device */
313 memset(bootefi_device_path
[0].str
, 0, sizeof(bootefi_device_path
[0].str
));
314 ascii2unicode(bootefi_device_path
[0].str
, devname
);
316 /* Patch bootefi_image_path to the target file path */
317 memset(bootefi_image_path
[0].str
, 0, sizeof(bootefi_image_path
[0].str
));
318 if (strcmp(dev
, "Net")) {
319 /* Add leading / to fs paths, because they're absolute */
320 snprintf(devname
, sizeof(devname
), "/%s", path
);
322 snprintf(devname
, sizeof(devname
), "%s", path
);
324 ascii2unicode(bootefi_image_path
[0].str
, devname
);