[u-boot.git] / cmd / bootefi.c

/*
 *  EFI application loader
 *
 *  Copyright (c) 2016 Alexander Graf
 *
 *  SPDX-License-Identifier:     GPL-2.0+
 */

#include <common.h>
#include <command.h>
#include <efi_loader.h>
#include <errno.h>
#include <libfdt.h>
#include <libfdt_env.h>
#include <memalign.h>
#include <asm/global_data.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 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);
	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;
#endif

	/* 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 1;
	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;

	/* 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 */
	desc = blk_get_dev(dev, simple_strtol(devnr, NULL, 10));
	if (desc && (desc->type != DEV_TYPE_UNKNOWN) &&
	    (desc->part_type == PART_TYPE_ISO)) {
		if (!colon)
			snprintf(devname, sizeof(devname), "%s%s:1", dev,
				 devnr);
		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);
}
Commit	Line	Data
b9939336 AG	1	/*
	2	* EFI application loader
	3	*
	4	* Copyright (c) 2016 Alexander Graf
	5	*
	6	* SPDX-License-Identifier: GPL-2.0+
	7	*/
	8
	9	#include <common.h>
	10	#include <command.h>
	11	#include <efi_loader.h>
	12	#include <errno.h>
	13	#include <libfdt.h>
	14	#include <libfdt_env.h>
ad0c1a3d	15	#include <memalign.h>
0d9d501f AG	16	#include <asm/global_data.h>
	17
	18	DECLARE_GLOBAL_DATA_PTR;
b9939336 AG	19
	20	/*
	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.
	24	*
	25	* In addition to the originating device we also declare the file path
	26	* of "bootefi" based loads to be /bootefi.
	27	*/
0f4060eb	28	static struct efi_device_path_file_path bootefi_image_path[] = {
b9939336 AG	29	{
	30	.dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE,
	31	.dp.sub_type = DEVICE_PATH_SUB_TYPE_FILE_PATH,
0f4060eb	32	.dp.length = sizeof(bootefi_image_path[0]),
b9939336 AG	33	.str = { 'b','o','o','t','e','f','i' },
	34	}, {
	35	.dp.type = DEVICE_PATH_TYPE_END,
	36	.dp.sub_type = DEVICE_PATH_SUB_TYPE_END,
0f4060eb	37	.dp.length = sizeof(bootefi_image_path[0]),
b9939336 AG	38	}
	39	};
	40
c07ad7c0 AG	41	static struct efi_device_path_file_path bootefi_device_path[] = {
	42	{
	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' },
	47	}, {
	48	.dp.type = DEVICE_PATH_TYPE_END,
	49	.dp.sub_type = DEVICE_PATH_SUB_TYPE_END,
	50	.dp.length = sizeof(bootefi_image_path[0]),
	51	}
	52	};
	53
b9939336 AG	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)
	57	{
c07ad7c0	58	*protocol_interface = bootefi_device_path;
b9939336 AG	59	return EFI_SUCCESS;
	60	}
	61
	62	/* The EFI loaded_image interface for the image executed via "bootefi" */
	63	static struct efi_loaded_image loaded_image_info = {
c07ad7c0	64	.device_handle = bootefi_device_path,
0f4060eb	65	.file_path = bootefi_image_path,
b9939336 AG	66	};
	67
	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,
	71	.protocols = {
	72	{
	73	/*
	74	* When asking for the loaded_image interface, just
	75	* return handle which points to loaded_image_info
	76	*/
	77	.guid = &efi_guid_loaded_image,
	78	.open = &efi_return_handle,
	79	},
	80	{
	81	/*
	82	* When asking for the device path interface, return
c07ad7c0	83	* bootefi_device_path
b9939336 AG	84	*/
	85	.guid = &efi_guid_device_path,
	86	.open = &bootefi_open_dp,
	87	},
	88	},
	89	};
	90
	91	/* The EFI object struct for the device the "bootefi" image was loaded from */
	92	static struct efi_object bootefi_device_obj = {
c07ad7c0	93	.handle = bootefi_device_path,
b9939336 AG	94	.protocols = {
	95	{
	96	/* When asking for the device path interface, return
c07ad7c0	97	* bootefi_device_path */
b9939336 AG	98	.guid = &efi_guid_device_path,
	99	.open = &bootefi_open_dp,
	100	}
	101	},
	102	};
	103
0d9d501f AG	104	static void copy_fdt(void fdt)
	105	{
	106	u64 fdt_size = fdt_totalsize(fdt);
ad0c1a3d AG	107	unsigned long fdt_ram_start = -1L, fdt_pages;
ad0c1a3d AG	108	u64 new_fdt_addr;
0d9d501f	109	void *new_fdt;
ad0c1a3d	110	int i;
0d9d501f	111
ad0c1a3d AG	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;
0d9d501f	115
ad0c1a3d AG	116	if (!ram_size)
	117	continue;
	118
	119	if (ram_start < fdt_ram_start)
	120	fdt_ram_start = ram_start;
	121	}
	122
	123	/* Give us at least 4kb breathing room */
	124	fdt_size = ALIGN(fdt_size + 4096, 4096);
	125	fdt_pages = fdt_size >> EFI_PAGE_SHIFT;
	126
	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);
	133	}
	134	new_fdt = (void*)(ulong)new_fdt_addr;
0d9d501f AG	135	memcpy(new_fdt, fdt, fdt_totalsize(fdt));
	136	fdt_set_totalsize(new_fdt, fdt_size);
	137
	138	return new_fdt;
	139	}
	140
b9939336 AG	141	/*
	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.
	144	*/
1c39809b	145	static unsigned long do_bootefi_exec(void efi, void fdt)
b9939336 AG	146	{
	147	ulong (entry)(void image_handle, struct efi_system_table *st);
	148	ulong fdt_pages, fdt_size, fdt_start, fdt_end;
dea2174d	149	bootm_headers_t img = { 0 };
b9939336 AG	150
	151	/*
	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
	154	*/
	155	efi_save_gd();
	156
1c39809b	157	if (fdt && !fdt_check_header(fdt)) {
dea2174d	158	/* Prepare fdt for payload */
0d9d501f AG	159	fdt = copy_fdt(fdt);
	160
	161	if (image_setup_libfdt(&img, fdt, 0, NULL)) {
dea2174d AG	162	printf("ERROR: Failed to process device tree\n");
	163	return -EINVAL;
	164	}
	165
	166	/* Link to it in the efi tables */
b9939336	167	systab.tables[0].guid = EFI_FDT_GUID;
0d9d501f	168	systab.tables[0].table = fdt;
b9939336 AG	169	systab.nr_tables = 1;
	170
	171	/* And reserve the space in the memory map */
0d9d501f AG	172	fdt_start = ((ulong)fdt) & ~EFI_PAGE_MASK;
0d9d501f AG	173	fdt_end = ((ulong)fdt) + fdt_totalsize(fdt);
b9939336 AG	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 */
	177	fdt_pages += 2;
	178	efi_add_memory_map(fdt_start, fdt_pages,
	179	EFI_BOOT_SERVICES_DATA, true);
b9939336	180	} else {
1c39809b	181	printf("WARNING: Invalid device tree, expect boot to fail\n");
b9939336 AG	182	systab.nr_tables = 0;
	183	}
	184
	185	/* Load the EFI payload */
	186	entry = efi_load_pe(efi, &loaded_image_info);
	187	if (!entry)
	188	return -ENOENT;
	189
	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
	195	efi_disk_register();
	196	#endif
be8d3241 AG	197	#ifdef CONFIG_LCD
	198	efi_gop_register();
	199	#endif
0efe1bcf AG	200	#ifdef CONFIG_NET
	201	void *nethandle = loaded_image_info.device_handle;
	202	efi_net_register(&nethandle);
	203
	204	if (!memcmp(bootefi_device_path[0].str, "N\0e\0t", 6))
	205	loaded_image_info.device_handle = nethandle;
	206	#endif
b9939336 AG	207
b9939336 AG	208	/* Call our payload! */
edcef3ba	209	debug("%s:%d Jumping to 0x%lx\n", __func__, __LINE__, (long)entry);
a86aeaf2 AG	210
	211	if (setjmp(&loaded_image_info.exit_jmp)) {
	212	efi_status_t status = loaded_image_info.exit_status;
	213	return status == EFI_SUCCESS ? 0 : -EINVAL;
	214	}
	215
b9939336 AG	216	return entry(&loaded_image_info, &systab);
	217	}
	218
	219
	220	/* Interpreter command to boot an arbitrary EFI image from memory */
	221	static int do_bootefi(cmd_tbl_t cmdtp, int flag, int argc, char const argv[])
	222	{
1c39809b AG	223	char saddr, sfdt;
1c39809b AG	224	unsigned long addr, fdt_addr = 0;
b9939336 AG	225	int r = 0;
	226
	227	if (argc < 2)
	228	return 1;
	229	saddr = argv[1];
	230
	231	addr = simple_strtoul(saddr, NULL, 16);
	232
1c39809b AG	233	if (argc > 2) {
	234	sfdt = argv[2];
	235	fdt_addr = simple_strtoul(sfdt, NULL, 16);
	236	}
	237
b9939336	238	printf("## Starting EFI application at 0x%08lx ...\n", addr);
1c39809b	239	r = do_bootefi_exec((void )addr, (void)fdt_addr);
b9939336 AG	240	printf("## Application terminated, r = %d\n", r);
	241
	242	if (r != 0)
	243	r = 1;
	244
	245	return r;
	246	}
	247
	248	#ifdef CONFIG_SYS_LONGHELP
	249	static char bootefi_help_text[] =
1c39809b AG	250	"<image address> [fdt address]\n"
	251	" - boot EFI payload stored at address <image address>.\n"
	252	" If specified, the device tree located at <fdt address> gets\n"
	253	" exposed as EFI configuration table.\n";
b9939336 AG	254	#endif
	255
	256	U_BOOT_CMD(
1c39809b	257	bootefi, 3, 0, do_bootefi,
92dfd922	258	"Boots an EFI payload from memory",
b9939336 AG	259	bootefi_help_text
b9939336 AG	260	);
0f4060eb	261
c07ad7c0	262	void efi_set_bootdev(const char dev, const char devnr, const char *path)
0f4060eb	263	{
8c3df0bf	264	__maybe_unused struct blk_desc *desc;
ecbe1a07	265	char devname[32] = { 0 }; /* dp->str is u16[32] long */
0f4060eb AG	266	char *colon;
	267
	268	/* Assemble the condensed device name we use in efi_disk.c */
	269	snprintf(devname, sizeof(devname), "%s%s", dev, devnr);
	270	colon = strchr(devname, ':');
8c3df0bf AG	271
	272	#ifdef CONFIG_ISO_PARTITION
	273	/* For ISOs we create partition block devices */
	274	desc = blk_get_dev(dev, simple_strtol(devnr, NULL, 10));
	275	if (desc && (desc->type != DEV_TYPE_UNKNOWN) &&
	276	(desc->part_type == PART_TYPE_ISO)) {
	277	if (!colon)
	278	snprintf(devname, sizeof(devname), "%s%s:1", dev,
	279	devnr);
	280	colon = NULL;
	281	}
	282	#endif
	283
0f4060eb AG	284	if (colon)
	285	*colon = '\0';
	286
c07ad7c0 AG	287	/* Patch bootefi_device_path to the target device */
	288	memset(bootefi_device_path[0].str, 0, sizeof(bootefi_device_path[0].str));
	289	ascii2unicode(bootefi_device_path[0].str, devname);
	290
	291	/* Patch bootefi_image_path to the target file path */
0f4060eb	292	memset(bootefi_image_path[0].str, 0, sizeof(bootefi_image_path[0].str));
49271666 AG	293	if (strcmp(dev, "Net")) {
	294	/* Add leading / to fs paths, because they're absolute */
	295	snprintf(devname, sizeof(devname), "/%s", path);
	296	} else {
	297	snprintf(devname, sizeof(devname), "%s", path);
	298	}
0f4060eb AG	299	ascii2unicode(bootefi_image_path[0].str, devname);
0f4060eb AG	300	}