aboutsummaryrefslogtreecommitdiff
path: root/cmd/bootefi.c
blob: 3619a20e64337838c3496086ffaeb41eb77e5d94 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
// SPDX-License-Identifier: GPL-2.0+
/*
 *  EFI application loader
 *
 *  Copyright (c) 2016 Alexander Graf
 */

#include <common.h>
#include <bootm.h>
#include <charset.h>
#include <command.h>
#include <dm.h>
#include <efi_loader.h>
#include <efi_selftest.h>
#include <errno.h>
#include <linux/libfdt.h>
#include <linux/libfdt_env.h>
#include <mapmem.h>
#include <memalign.h>
#include <asm/global_data.h>
#include <asm-generic/sections.h>
#include <asm-generic/unaligned.h>
#include <linux/linkage.h>

DECLARE_GLOBAL_DATA_PTR;

static struct efi_device_path *bootefi_image_path;
static struct efi_device_path *bootefi_device_path;

/*
 * Allow unaligned memory access.
 *
 * This routine is overridden by architectures providing this feature.
 */
void __weak allow_unaligned(void)
{
}

/*
 * Set the load options of an image from an environment variable.
 *
 * @loaded_image_info:	the image
 * @env_var:		name of the environment variable
 */
static void set_load_options(struct efi_loaded_image *loaded_image_info,
			     const char *env_var)
{
	size_t size;
	const char *env = env_get(env_var);
	u16 *pos;

	loaded_image_info->load_options = NULL;
	loaded_image_info->load_options_size = 0;
	if (!env)
		return;
	size = utf8_utf16_strlen(env) + 1;
	loaded_image_info->load_options = calloc(size, sizeof(u16));
	if (!loaded_image_info->load_options) {
		printf("ERROR: Out of memory\n");
		return;
	}
	pos = loaded_image_info->load_options;
	utf8_utf16_strcpy(&pos, env);
	loaded_image_info->load_options_size = size * 2;
}

/**
 * copy_fdt() - Copy the device tree to a new location available to EFI
 *
 * The FDT is copied to a suitable location within the EFI memory map.
 * Additional 12 KiB are added to the space in case the device tree needs to be
 * expanded later with fdt_open_into().
 *
 * @fdtp:	On entry a pointer to the flattened device tree.
 *		On exit a pointer to the copy of the flattened device tree.
 *		FDT start
 * Return:	status code
 */
static efi_status_t copy_fdt(void **fdtp)
{
	unsigned long fdt_ram_start = -1L, fdt_pages;
	efi_status_t ret = 0;
	void *fdt, *new_fdt;
	u64 new_fdt_addr;
	uint fdt_size;
	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 12 KiB of breathing room in case the device tree
	 * needs to be expanded later.
	 */
	fdt = *fdtp;
	fdt_pages = efi_size_in_pages(fdt_totalsize(fdt) + 0x3000);
	fdt_size = fdt_pages << EFI_PAGE_SHIFT;

	/*
	 * Safe fdt location is at 127 MiB.
	 * On the sandbox convert from the sandbox address space.
	 */
	new_fdt_addr = (uintptr_t)map_sysmem(fdt_ram_start + 0x7f00000 +
					     fdt_size, 0);
	ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
				 EFI_RUNTIME_SERVICES_DATA, fdt_pages,
				 &new_fdt_addr);
	if (ret != EFI_SUCCESS) {
		/* If we can't put it there, put it somewhere */
		new_fdt_addr = (ulong)memalign(EFI_PAGE_SIZE, fdt_size);
		ret = efi_allocate_pages(EFI_ALLOCATE_MAX_ADDRESS,
					 EFI_RUNTIME_SERVICES_DATA, fdt_pages,
					 &new_fdt_addr);
		if (ret != EFI_SUCCESS) {
			printf("ERROR: Failed to reserve space for FDT\n");
			goto done;
		}
	}
	new_fdt = (void *)(uintptr_t)new_fdt_addr;
	memcpy(new_fdt, fdt, fdt_totalsize(fdt));
	fdt_set_totalsize(new_fdt, fdt_size);

	*fdtp = (void *)(uintptr_t)new_fdt_addr;
done:
	return ret;
}

/*
 * efi_carve_out_dt_rsv() - Carve out DT reserved memory ranges
 *
 * The mem_rsv entries of the FDT are added to the memory map. Any failures are
 * ignored because this is not critical and we would rather continue to try to
 * boot.
 *
 * @fdt: Pointer to device tree
 */
static void efi_carve_out_dt_rsv(void *fdt)
{
	int nr_rsv, i;
	uint64_t addr, size, pages;

	nr_rsv = fdt_num_mem_rsv(fdt);

	/* Look for an existing entry and add it to the efi mem map. */
	for (i = 0; i < nr_rsv; i++) {
		if (fdt_get_mem_rsv(fdt, i, &addr, &size) != 0)
			continue;

		/* Convert from sandbox address space. */
		addr = (uintptr_t)map_sysmem(addr, 0);

		pages = efi_size_in_pages(size + (addr & EFI_PAGE_MASK));
		addr &= ~EFI_PAGE_MASK;
		if (!efi_add_memory_map(addr, pages, EFI_RESERVED_MEMORY_TYPE,
					false))
			printf("FDT memrsv map %d: Failed to add to map\n", i);
	}
}

static efi_status_t efi_install_fdt(ulong fdt_addr)
{
	bootm_headers_t img = { 0 };
	efi_status_t ret;
	void *fdt;

	fdt = map_sysmem(fdt_addr, 0);
	if (fdt_check_header(fdt)) {
		printf("ERROR: invalid device tree\n");
		return EFI_INVALID_PARAMETER;
	}

	/* Create memory reservation as indicated by the device tree */
	efi_carve_out_dt_rsv(fdt);

	/* Prepare fdt for payload */
	ret = copy_fdt(&fdt);
	if (ret)
		return ret;

	if (image_setup_libfdt(&img, fdt, 0, NULL)) {
		printf("ERROR: failed to process device tree\n");
		return EFI_LOAD_ERROR;
	}

	/* Link to it in the efi tables */
	ret = efi_install_configuration_table(&efi_guid_fdt, fdt);
	if (ret != EFI_SUCCESS)
		return EFI_OUT_OF_RESOURCES;

	return ret;
}

static efi_status_t bootefi_run_prepare(const char *load_options_path,
		struct efi_device_path *device_path,
		struct efi_device_path *image_path,
		struct efi_loaded_image_obj **image_objp,
		struct efi_loaded_image **loaded_image_infop)
{
	efi_status_t ret;

	ret = efi_setup_loaded_image(device_path, image_path, image_objp,
				     loaded_image_infop);
	if (ret != EFI_SUCCESS)
		return ret;

	/* Transfer environment variable as load options */
	set_load_options(*loaded_image_infop, load_options_path);

	return 0;
}

/**
 * bootefi_run_finish() - finish up after running an EFI test
 *
 * @loaded_image_info: Pointer to a struct which holds the loaded image info
 * @image_objj: Pointer to a struct which holds the loaded image object
 */
static void bootefi_run_finish(struct efi_loaded_image_obj *image_obj,
			       struct efi_loaded_image *loaded_image_info)
{
	efi_restore_gd();
	free(loaded_image_info->load_options);
	efi_delete_handle(&image_obj->header);
}

/**
 * do_bootefi_exec() - execute EFI binary
 *
 * @efi:		address of the binary
 * @device_path:	path of the device from which the binary was loaded
 * @image_path:		device path of the binary
 * Return:		status code
 *
 * Load the EFI binary into a newly assigned memory unwinding the relocation
 * information, install the loaded image protocol, and call the binary.
 */
static efi_status_t do_bootefi_exec(void *efi,
				    struct efi_device_path *device_path,
				    struct efi_device_path *image_path)
{
	efi_handle_t mem_handle = NULL;
	struct efi_device_path *memdp = NULL;
	efi_status_t ret;
	struct efi_loaded_image_obj *image_obj = NULL;
	struct efi_loaded_image *loaded_image_info = NULL;

	/*
	 * Special case for efi payload not loaded from disk, such as
	 * 'bootefi hello' or for example payload loaded directly into
	 * memory via JTAG, etc:
	 */
	if (!device_path && !image_path) {
		printf("WARNING: using memory device/image path, this may confuse some payloads!\n");
		/* actual addresses filled in after efi_load_pe() */
		memdp = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE, 0, 0);
		device_path = image_path = memdp;
		/*
		 * Grub expects that the device path of the loaded image is
		 * installed on a handle.
		 */
		ret = efi_create_handle(&mem_handle);
		if (ret != EFI_SUCCESS)
			return ret; /* TODO: leaks device_path */
		ret = efi_add_protocol(mem_handle, &efi_guid_device_path,
				       device_path);
		if (ret != EFI_SUCCESS)
			goto err_add_protocol;
	} else {
		assert(device_path && image_path);
	}

	ret = bootefi_run_prepare("bootargs", device_path, image_path,
				  &image_obj, &loaded_image_info);
	if (ret)
		goto err_prepare;

	/* Load the EFI payload */
	ret = efi_load_pe(image_obj, efi, loaded_image_info);
	if (ret != EFI_SUCCESS)
		goto err_prepare;

	if (memdp) {
		struct efi_device_path_memory *mdp = (void *)memdp;
		mdp->memory_type = loaded_image_info->image_code_type;
		mdp->start_address = (uintptr_t)loaded_image_info->image_base;
		mdp->end_address = mdp->start_address +
				loaded_image_info->image_size;
	}

	/* we don't support much: */
	env_set("efi_8be4df61-93ca-11d2-aa0d-00e098032b8c_OsIndicationsSupported",
		"{ro,boot}(blob)0000000000000000");

	/* Call our payload! */
	debug("%s: Jumping to 0x%p\n", __func__, image_obj->entry);
	ret = EFI_CALL(efi_start_image(&image_obj->header, NULL, NULL));

err_prepare:
	/* image has returned, loaded-image obj goes *poof*: */
	bootefi_run_finish(image_obj, loaded_image_info);

err_add_protocol:
	if (mem_handle)
		efi_delete_handle(mem_handle);

	return ret;
}

#ifdef CONFIG_CMD_BOOTEFI_SELFTEST
/**
 * bootefi_test_prepare() - prepare to run an EFI test
 *
 * Prepare to run a test as if it were provided by a loaded image.
 *
 * @image_objp:		pointer to be set to the loaded image handle
 * @loaded_image_infop:	pointer to be set to the loaded image protocol
 * @path:		dummy file path used to construct the device path
 *			set in the loaded image protocol
 * @load_options_path:	name of a U-Boot environment variable. Its value is
 *			set as load options in the loaded image protocol.
 * Return:		status code
 */
static efi_status_t bootefi_test_prepare
		(struct efi_loaded_image_obj **image_objp,
		 struct efi_loaded_image **loaded_image_infop, const char *path,
		 const char *load_options_path)
{
	efi_status_t ret;

	/* Construct a dummy device path */
	bootefi_device_path = efi_dp_from_mem(EFI_RESERVED_MEMORY_TYPE, 0, 0);
	if (!bootefi_device_path)
		return EFI_OUT_OF_RESOURCES;

	bootefi_image_path = efi_dp_from_file(NULL, 0, path);
	if (!bootefi_image_path) {
		ret = EFI_OUT_OF_RESOURCES;
		goto failure;
	}

	ret = bootefi_run_prepare(load_options_path, bootefi_device_path,
				  bootefi_image_path, image_objp,
				  loaded_image_infop);
	if (ret == EFI_SUCCESS)
		return ret;

	efi_free_pool(bootefi_image_path);
	bootefi_image_path = NULL;
failure:
	efi_free_pool(bootefi_device_path);
	bootefi_device_path = NULL;
	return ret;
}

#endif /* CONFIG_CMD_BOOTEFI_SELFTEST */

static int do_bootefi_bootmgr_exec(void)
{
	struct efi_device_path *device_path, *file_path;
	void *addr;
	efi_status_t r;

	addr = efi_bootmgr_load(&device_path, &file_path);
	if (!addr)
		return 1;

	printf("## Starting EFI application at %p ...\n", addr);
	r = do_bootefi_exec(addr, device_path, file_path);
	printf("## Application terminated, r = %lu\n",
	       r & ~EFI_ERROR_MASK);

	if (r != EFI_SUCCESS)
		return 1;

	return 0;
}

/* 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[])
{
	unsigned long addr;
	char *saddr;
	efi_status_t r;
	unsigned long fdt_addr;

	/* Allow unaligned memory access */
	allow_unaligned();

	switch_to_non_secure_mode();

	/* Initialize EFI drivers */
	r = efi_init_obj_list();
	if (r != EFI_SUCCESS) {
		printf("Error: Cannot set up EFI drivers, r = %lu\n",
		       r & ~EFI_ERROR_MASK);
		return CMD_RET_FAILURE;
	}

	if (argc < 2)
		return CMD_RET_USAGE;

	if (argc > 2) {
		fdt_addr = simple_strtoul(argv[2], NULL, 16);
		if (!fdt_addr && *argv[2] != '0')
			return CMD_RET_USAGE;
		/* Install device tree */
		r = efi_install_fdt(fdt_addr);
		if (r != EFI_SUCCESS) {
			printf("ERROR: failed to install device tree\n");
			return CMD_RET_FAILURE;
		}
	} else {
		/* Remove device tree. EFI_NOT_FOUND can be ignored here */
		efi_install_configuration_table(&efi_guid_fdt, NULL);
		printf("WARNING: booting without device tree\n");
	}
#ifdef CONFIG_CMD_BOOTEFI_HELLO
	if (!strcmp(argv[1], "hello")) {
		ulong size = __efi_helloworld_end - __efi_helloworld_begin;

		saddr = env_get("loadaddr");
		if (saddr)
			addr = simple_strtoul(saddr, NULL, 16);
		else
			addr = CONFIG_SYS_LOAD_ADDR;
		memcpy(map_sysmem(addr, size), __efi_helloworld_begin, size);
	} else
#endif
#ifdef CONFIG_CMD_BOOTEFI_SELFTEST
	if (!strcmp(argv[1], "selftest")) {
		struct efi_loaded_image_obj *image_obj;
		struct efi_loaded_image *loaded_image_info;

		r = bootefi_test_prepare(&image_obj, &loaded_image_info,
					 "\\selftest", "efi_selftest");
		if (r != EFI_SUCCESS)
			return CMD_RET_FAILURE;

		/* Execute the test */
		r = EFI_CALL(efi_selftest(&image_obj->header, &systab));
		bootefi_run_finish(image_obj, loaded_image_info);
		return r != EFI_SUCCESS;
	} else
#endif
	if (!strcmp(argv[1], "bootmgr")) {
		return do_bootefi_bootmgr_exec();
	} else {
		saddr = argv[1];

		addr = simple_strtoul(saddr, NULL, 16);
		/* Check that a numeric value was passed */
		if (!addr && *saddr != '0')
			return CMD_RET_USAGE;

	}

	printf("## Starting EFI application at %08lx ...\n", addr);
	r = do_bootefi_exec(map_sysmem(addr, 0), bootefi_device_path,
			    bootefi_image_path);
	printf("## Application terminated, r = %lu\n",
	       r & ~EFI_ERROR_MASK);

	if (r != EFI_SUCCESS)
		return 1;
	else
		return 0;
}

#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"
#ifdef CONFIG_CMD_BOOTEFI_HELLO
	"bootefi hello\n"
	"  - boot a sample Hello World application stored within U-Boot\n"
#endif
#ifdef CONFIG_CMD_BOOTEFI_SELFTEST
	"bootefi selftest [fdt address]\n"
	"  - boot an EFI selftest application stored within U-Boot\n"
	"    Use environment variable efi_selftest to select a single test.\n"
	"    Use 'setenv efi_selftest list' to enumerate all tests.\n"
#endif
	"bootefi bootmgr [fdt addr]\n"
	"  - load and boot EFI payload based on BootOrder/BootXXXX variables.\n"
	"\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)
{
	struct efi_device_path *device, *image;
	efi_status_t ret;

	/* efi_set_bootdev is typically called repeatedly, recover memory */
	efi_free_pool(bootefi_device_path);
	efi_free_pool(bootefi_image_path);

	ret = efi_dp_from_name(dev, devnr, path, &device, &image);
	if (ret == EFI_SUCCESS) {
		bootefi_device_path = device;
		bootefi_image_path = image;
	} else {
		bootefi_device_path = NULL;
		bootefi_image_path = NULL;
	}
}