[J-u-boot.git] / lib / uuid.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright 2011 Calxeda, Inc.
 */

#include <common.h>
#include <env.h>
#include <time.h>
#include <linux/ctype.h>
#include <errno.h>
#include <common.h>
#include <asm/io.h>
#include <part_efi.h>
#include <malloc.h>

/*
 * UUID - Universally Unique IDentifier - 128 bits unique number.
 *        There are 5 versions and one variant of UUID defined by RFC4122
 *        specification. A UUID contains a set of fields. The set varies
 *        depending on the version of the UUID, as shown below:
 *        - time, MAC address(v1),
 *        - user ID(v2),
 *        - MD5 of name or URL(v3),
 *        - random data(v4),
 *        - SHA-1 of name or URL(v5),
 *
 * Layout of UUID:
 * timestamp - 60-bit: time_low, time_mid, time_hi_and_version
 * version   - 4 bit (bit 4 through 7 of the time_hi_and_version)
 * clock seq - 14 bit: clock_seq_hi_and_reserved, clock_seq_low
 * variant:  - bit 6 and 7 of clock_seq_hi_and_reserved
 * node      - 48 bit
 *
 * source: https://www.ietf.org/rfc/rfc4122.txt
 *
 * UUID binary format (16 bytes):
 *
 * 4B-2B-2B-2B-6B (big endian - network byte order)
 *
 * UUID string is 36 length of characters (36 bytes):
 *
 * 0        9    14   19   24
 * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
 *    be     be   be   be       be
 *
 * where x is a hexadecimal character. Fields are separated by '-'s.
 * When converting to a binary UUID, le means the field should be converted
 * to little endian and be means it should be converted to big endian.
 *
 * UUID is also used as GUID (Globally Unique Identifier) with the same binary
 * format but it differs in string format like below.
 *
 * GUID:
 * 0        9    14   19   24
 * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
 *    le     le   le   be       be
 *
 * GUID is used e.g. in GPT (GUID Partition Table) as a partiions unique id.
 */
int uuid_str_valid(const char *uuid)
{
	int i, valid;

	if (uuid == NULL)
		return 0;

	for (i = 0, valid = 1; uuid[i] && valid; i++) {
		switch (i) {
		case 8: case 13: case 18: case 23:
			valid = (uuid[i] == '-');
			break;
		default:
			valid = isxdigit(uuid[i]);
			break;
		}
	}

	if (i != UUID_STR_LEN || !valid)
		return 0;

	return 1;
}

#ifdef CONFIG_PARTITION_TYPE_GUID
static const struct {
	const char *string;
	efi_guid_t guid;
} list_guid[] = {
	{"system",	PARTITION_SYSTEM_GUID},
	{"mbr",		LEGACY_MBR_PARTITION_GUID},
	{"msft",	PARTITION_MSFT_RESERVED_GUID},
	{"data",	PARTITION_BASIC_DATA_GUID},
	{"linux",	PARTITION_LINUX_FILE_SYSTEM_DATA_GUID},
	{"raid",	PARTITION_LINUX_RAID_GUID},
	{"swap",	PARTITION_LINUX_SWAP_GUID},
	{"lvm",		PARTITION_LINUX_LVM_GUID}
};

/*
 * uuid_guid_get_bin() - this function get GUID bin for string
 *
 * @param guid_str - pointer to partition type string
 * @param guid_bin - pointer to allocated array for big endian output [16B]
 */
int uuid_guid_get_bin(const char *guid_str, unsigned char *guid_bin)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(list_guid); i++) {
		if (!strcmp(list_guid[i].string, guid_str)) {
			memcpy(guid_bin, &list_guid[i].guid, 16);
			return 0;
		}
	}
	return -ENODEV;
}

/*
 * uuid_guid_get_str() - this function get string for GUID.
 *
 * @param guid_bin - pointer to string with partition type guid [16B]
 * @param guid_str - pointer to allocated partition type string [7B]
 */
int uuid_guid_get_str(unsigned char *guid_bin, char *guid_str)
{
	int i;

	*guid_str = 0;
	for (i = 0; i < ARRAY_SIZE(list_guid); i++) {
		if (!memcmp(list_guid[i].guid.b, guid_bin, 16)) {
			strcpy(guid_str, list_guid[i].string);
			return 0;
		}
	}
	return -ENODEV;
}
#endif

/*
 * uuid_str_to_bin() - convert string UUID or GUID to big endian binary data.
 *
 * @param uuid_str - pointer to UUID or GUID string [37B] or GUID shorcut
 * @param uuid_bin - pointer to allocated array for big endian output [16B]
 * @str_format     - UUID string format: 0 - UUID; 1 - GUID
 */
int uuid_str_to_bin(char *uuid_str, unsigned char *uuid_bin, int str_format)
{
	uint16_t tmp16;
	uint32_t tmp32;
	uint64_t tmp64;

	if (!uuid_str_valid(uuid_str)) {
#ifdef CONFIG_PARTITION_TYPE_GUID
		if (!uuid_guid_get_bin(uuid_str, uuid_bin))
			return 0;
#endif
		return -EINVAL;
	}

	if (str_format == UUID_STR_FORMAT_STD) {
		tmp32 = cpu_to_be32(simple_strtoul(uuid_str, NULL, 16));
		memcpy(uuid_bin, &tmp32, 4);

		tmp16 = cpu_to_be16(simple_strtoul(uuid_str + 9, NULL, 16));
		memcpy(uuid_bin + 4, &tmp16, 2);

		tmp16 = cpu_to_be16(simple_strtoul(uuid_str + 14, NULL, 16));
		memcpy(uuid_bin + 6, &tmp16, 2);
	} else {
		tmp32 = cpu_to_le32(simple_strtoul(uuid_str, NULL, 16));
		memcpy(uuid_bin, &tmp32, 4);

		tmp16 = cpu_to_le16(simple_strtoul(uuid_str + 9, NULL, 16));
		memcpy(uuid_bin + 4, &tmp16, 2);

		tmp16 = cpu_to_le16(simple_strtoul(uuid_str + 14, NULL, 16));
		memcpy(uuid_bin + 6, &tmp16, 2);
	}

	tmp16 = cpu_to_be16(simple_strtoul(uuid_str + 19, NULL, 16));
	memcpy(uuid_bin + 8, &tmp16, 2);

	tmp64 = cpu_to_be64(simple_strtoull(uuid_str + 24, NULL, 16));
	memcpy(uuid_bin + 10, (char *)&tmp64 + 2, 6);

	return 0;
}

/*
 * uuid_bin_to_str() - convert big endian binary data to string UUID or GUID.
 *
 * @param uuid_bin:	pointer to binary data of UUID (big endian) [16B]
 * @param uuid_str:	pointer to allocated array for output string [37B]
 * @str_format:		bit 0: 0 - UUID; 1 - GUID
 *			bit 1: 0 - lower case; 2 - upper case
 */
void uuid_bin_to_str(unsigned char *uuid_bin, char *uuid_str, int str_format)
{
	const u8 uuid_char_order[UUID_BIN_LEN] = {0, 1, 2, 3, 4, 5, 6, 7, 8,
						  9, 10, 11, 12, 13, 14, 15};
	const u8 guid_char_order[UUID_BIN_LEN] = {3, 2, 1, 0, 5, 4, 7, 6, 8,
						  9, 10, 11, 12, 13, 14, 15};
	const u8 *char_order;
	const char *format;
	int i;

	/*
	 * UUID and GUID bin data - always in big endian:
	 * 4B-2B-2B-2B-6B
	 * be be be be be
	 */
	if (str_format & UUID_STR_FORMAT_GUID)
		char_order = guid_char_order;
	else
		char_order = uuid_char_order;
	if (str_format & UUID_STR_UPPER_CASE)
		format = "%02X";
	else
		format = "%02x";

	for (i = 0; i < 16; i++) {
		sprintf(uuid_str, format, uuid_bin[char_order[i]]);
		uuid_str += 2;
		switch (i) {
		case 3:
		case 5:
		case 7:
		case 9:
			*uuid_str++ = '-';
			break;
		}
	}
}

/*
 * gen_rand_uuid() - this function generates a random binary UUID version 4.
 *                   In this version all fields beside 4 bits of version and
 *                   2 bits of variant are randomly generated.
 *
 * @param uuid_bin - pointer to allocated array [16B]. Output is in big endian.
*/
#if defined(CONFIG_RANDOM_UUID) || defined(CONFIG_CMD_UUID)
void gen_rand_uuid(unsigned char *uuid_bin)
{
	u32 ptr[4];
	struct uuid *uuid = (struct uuid *)ptr;
	int i;

	srand(get_ticks() + rand());

	/* Set all fields randomly */
	for (i = 0; i < 4; i++)
		ptr[i] = rand();

	clrsetbits_be16(&uuid->time_hi_and_version,
			UUID_VERSION_MASK,
			UUID_VERSION << UUID_VERSION_SHIFT);

	clrsetbits_8(&uuid->clock_seq_hi_and_reserved,
		     UUID_VARIANT_MASK,
		     UUID_VARIANT << UUID_VARIANT_SHIFT);

	memcpy(uuid_bin, uuid, 16);
}

/*
 * gen_rand_uuid_str() - this function generates UUID v4 (random) in two string
 *                       formats UUID or GUID.
 *
 * @param uuid_str - pointer to allocated array [37B].
 * @param          - uuid output type: UUID - 0, GUID - 1
 */
void gen_rand_uuid_str(char *uuid_str, int str_format)
{
	unsigned char uuid_bin[UUID_BIN_LEN];

	/* Generate UUID (big endian) */
	gen_rand_uuid(uuid_bin);

	/* Convert UUID bin to UUID or GUID formated STRING  */
	uuid_bin_to_str(uuid_bin, uuid_str, str_format);
}

#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_CMD_UUID)
int do_uuid(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	char uuid[UUID_STR_LEN + 1];
	int str_format;

	if (!strcmp(argv[0], "uuid"))
		str_format = UUID_STR_FORMAT_STD;
	else
		str_format = UUID_STR_FORMAT_GUID;

	if (argc > 2)
		return CMD_RET_USAGE;

	gen_rand_uuid_str(uuid, str_format);

	if (argc == 1)
		printf("%s\n", uuid);
	else
		env_set(argv[1], uuid);

	return CMD_RET_SUCCESS;
}

U_BOOT_CMD(uuid, CONFIG_SYS_MAXARGS, 1, do_uuid,
	   "UUID - generate random Universally Unique Identifier",
	   "[<varname>]\n"
	   "Argument:\n"
	   "varname: for set result in a environment variable\n"
	   "e.g. uuid uuid_env"
);

U_BOOT_CMD(guid, CONFIG_SYS_MAXARGS, 1, do_uuid,
	   "GUID - generate Globally Unique Identifier based on random UUID",
	   "[<varname>]\n"
	   "Argument:\n"
	   "varname: for set result in a environment variable\n"
	   "e.g. guid guid_env"
);
#endif /* CONFIG_CMD_UUID */
#endif /* CONFIG_RANDOM_UUID || CONFIG_CMD_UUID */
Commit	Line	Data
83d290c5	1	// SPDX-License-Identifier: GPL-2.0+
e11938ea JH	2	/*
e11938ea JH	3	* Copyright 2011 Calxeda, Inc.
e11938ea JH	4	*/
e11938ea JH	5
89c8230d	6	#include <common.h>
9fb625ce	7	#include <env.h>
1045315d	8	#include <time.h>
e11938ea	9	#include <linux/ctype.h>
a96a0e61 PM	10	#include <errno.h>
a96a0e61 PM	11	#include <common.h>
d718ded0 PM	12	#include <asm/io.h>
	13	#include <part_efi.h>
	14	#include <malloc.h>
e11938ea JH	15
e11938ea JH	16	/*
a96a0e61 PM	17	* UUID - Universally Unique IDentifier - 128 bits unique number.
a96a0e61 PM	18	* There are 5 versions and one variant of UUID defined by RFC4122
4e4815fe PM	19	* specification. A UUID contains a set of fields. The set varies
	20	* depending on the version of the UUID, as shown below:
	21	* - time, MAC address(v1),
	22	* - user ID(v2),
	23	* - MD5 of name or URL(v3),
	24	* - random data(v4),
	25	* - SHA-1 of name or URL(v5),
	26	*
	27	* Layout of UUID:
	28	* timestamp - 60-bit: time_low, time_mid, time_hi_and_version
	29	* version - 4 bit (bit 4 through 7 of the time_hi_and_version)
	30	* clock seq - 14 bit: clock_seq_hi_and_reserved, clock_seq_low
	31	* variant: - bit 6 and 7 of clock_seq_hi_and_reserved
	32	* node - 48 bit
	33	*
	34	* source: https://www.ietf.org/rfc/rfc4122.txt
a96a0e61 PM	35	*
	36	* UUID binary format (16 bytes):
	37	*
	38	* 4B-2B-2B-2B-6B (big endian - network byte order)
	39	*
	40	* UUID string is 36 length of characters (36 bytes):
	41	*
	42	* 0 9 14 19 24
	43	* xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
	44	* be be be be be
	45	*
	46	* where x is a hexadecimal character. Fields are separated by '-'s.
	47	* When converting to a binary UUID, le means the field should be converted
	48	* to little endian and be means it should be converted to big endian.
e11938ea	49	*
a96a0e61 PM	50	* UUID is also used as GUID (Globally Unique Identifier) with the same binary
a96a0e61 PM	51	* format but it differs in string format like below.
e11938ea	52	*
a96a0e61	53	* GUID:
e11938ea JH	54	* 0 9 14 19 24
	55	* xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
	56	* le le le be be
a96a0e61 PM	57	*
a96a0e61 PM	58	* GUID is used e.g. in GPT (GUID Partition Table) as a partiions unique id.
e11938ea	59	*/
e11938ea JH	60	int uuid_str_valid(const char *uuid)
	61	{
	62	int i, valid;
	63
	64	if (uuid == NULL)
	65	return 0;
	66
	67	for (i = 0, valid = 1; uuid[i] && valid; i++) {
	68	switch (i) {
	69	case 8: case 13: case 18: case 23:
	70	valid = (uuid[i] == '-');
	71	break;
	72	default:
	73	valid = isxdigit(uuid[i]);
	74	break;
	75	}
	76	}
	77
d718ded0	78	if (i != UUID_STR_LEN \|\| !valid)
e11938ea JH	79	return 0;
	80
	81	return 1;
	82	}
	83
bcb41dca PD	84	#ifdef CONFIG_PARTITION_TYPE_GUID
	85	static const struct {
	86	const char *string;
	87	efi_guid_t guid;
	88	} list_guid[] = {
	89	{"system", PARTITION_SYSTEM_GUID},
	90	{"mbr", LEGACY_MBR_PARTITION_GUID},
	91	{"msft", PARTITION_MSFT_RESERVED_GUID},
	92	{"data", PARTITION_BASIC_DATA_GUID},
	93	{"linux", PARTITION_LINUX_FILE_SYSTEM_DATA_GUID},
	94	{"raid", PARTITION_LINUX_RAID_GUID},
	95	{"swap", PARTITION_LINUX_SWAP_GUID},
	96	{"lvm", PARTITION_LINUX_LVM_GUID}
	97	};
	98
	99	/*
	100	* uuid_guid_get_bin() - this function get GUID bin for string
	101	*
	102	* @param guid_str - pointer to partition type string
	103	* @param guid_bin - pointer to allocated array for big endian output [16B]
	104	*/
	105	int uuid_guid_get_bin(const char guid_str, unsigned char guid_bin)
	106	{
	107	int i;
	108
	109	for (i = 0; i < ARRAY_SIZE(list_guid); i++) {
	110	if (!strcmp(list_guid[i].string, guid_str)) {
	111	memcpy(guid_bin, &list_guid[i].guid, 16);
	112	return 0;
	113	}
	114	}
	115	return -ENODEV;
	116	}
	117
	118	/*
	119	* uuid_guid_get_str() - this function get string for GUID.
	120	*
	121	* @param guid_bin - pointer to string with partition type guid [16B]
	122	* @param guid_str - pointer to allocated partition type string [7B]
	123	*/
	124	int uuid_guid_get_str(unsigned char guid_bin, char guid_str)
	125	{
	126	int i;
	127
	128	*guid_str = 0;
	129	for (i = 0; i < ARRAY_SIZE(list_guid); i++) {
	130	if (!memcmp(list_guid[i].guid.b, guid_bin, 16)) {
	131	strcpy(guid_str, list_guid[i].string);
	132	return 0;
	133	}
	134	}
	135	return -ENODEV;
	136	}
	137	#endif
	138
d718ded0 PM	139	/*
	140	* uuid_str_to_bin() - convert string UUID or GUID to big endian binary data.
	141	*
bcb41dca	142	* @param uuid_str - pointer to UUID or GUID string [37B] or GUID shorcut
d718ded0 PM	143	* @param uuid_bin - pointer to allocated array for big endian output [16B]
	144	* @str_format - UUID string format: 0 - UUID; 1 - GUID
	145	*/
	146	int uuid_str_to_bin(char uuid_str, unsigned char uuid_bin, int str_format)
e11938ea JH	147	{
	148	uint16_t tmp16;
	149	uint32_t tmp32;
	150	uint64_t tmp64;
	151
bcb41dca PD	152	if (!uuid_str_valid(uuid_str)) {
	153	#ifdef CONFIG_PARTITION_TYPE_GUID
	154	if (!uuid_guid_get_bin(uuid_str, uuid_bin))
	155	return 0;
	156	#endif
a96a0e61	157	return -EINVAL;
bcb41dca	158	}
a96a0e61	159
d718ded0 PM	160	if (str_format == UUID_STR_FORMAT_STD) {
	161	tmp32 = cpu_to_be32(simple_strtoul(uuid_str, NULL, 16));
	162	memcpy(uuid_bin, &tmp32, 4);
e11938ea	163
d718ded0 PM	164	tmp16 = cpu_to_be16(simple_strtoul(uuid_str + 9, NULL, 16));
d718ded0 PM	165	memcpy(uuid_bin + 4, &tmp16, 2);
e11938ea	166
d718ded0 PM	167	tmp16 = cpu_to_be16(simple_strtoul(uuid_str + 14, NULL, 16));
	168	memcpy(uuid_bin + 6, &tmp16, 2);
	169	} else {
	170	tmp32 = cpu_to_le32(simple_strtoul(uuid_str, NULL, 16));
	171	memcpy(uuid_bin, &tmp32, 4);
e11938ea	172
d718ded0 PM	173	tmp16 = cpu_to_le16(simple_strtoul(uuid_str + 9, NULL, 16));
d718ded0 PM	174	memcpy(uuid_bin + 4, &tmp16, 2);
e11938ea	175
d718ded0 PM	176	tmp16 = cpu_to_le16(simple_strtoul(uuid_str + 14, NULL, 16));
	177	memcpy(uuid_bin + 6, &tmp16, 2);
	178	}
	179
	180	tmp16 = cpu_to_be16(simple_strtoul(uuid_str + 19, NULL, 16));
	181	memcpy(uuid_bin + 8, &tmp16, 2);
e11938ea	182
d718ded0 PM	183	tmp64 = cpu_to_be64(simple_strtoull(uuid_str + 24, NULL, 16));
d718ded0 PM	184	memcpy(uuid_bin + 10, (char *)&tmp64 + 2, 6);
a96a0e61 PM	185
	186	return 0;
	187	}
	188
d718ded0 PM	189	/*
	190	* uuid_bin_to_str() - convert big endian binary data to string UUID or GUID.
	191	*
3bad256f HS	192	* @param uuid_bin: pointer to binary data of UUID (big endian) [16B]
	193	* @param uuid_str: pointer to allocated array for output string [37B]
	194	* @str_format: bit 0: 0 - UUID; 1 - GUID
	195	* bit 1: 0 - lower case; 2 - upper case
d718ded0 PM	196	*/
d718ded0 PM	197	void uuid_bin_to_str(unsigned char uuid_bin, char uuid_str, int str_format)
a96a0e61	198	{
d718ded0 PM	199	const u8 uuid_char_order[UUID_BIN_LEN] = {0, 1, 2, 3, 4, 5, 6, 7, 8,
	200	9, 10, 11, 12, 13, 14, 15};
	201	const u8 guid_char_order[UUID_BIN_LEN] = {3, 2, 1, 0, 5, 4, 7, 6, 8,
	202	9, 10, 11, 12, 13, 14, 15};
	203	const u8 *char_order;
3bad256f	204	const char *format;
a96a0e61 PM	205	int i;
a96a0e61 PM	206
d718ded0 PM	207	/*
	208	* UUID and GUID bin data - always in big endian:
	209	* 4B-2B-2B-2B-6B
	210	* be be be be be
	211	*/
3bad256f HS	212	if (str_format & UUID_STR_FORMAT_GUID)
	213	char_order = guid_char_order;
	214	else
d718ded0	215	char_order = uuid_char_order;
3bad256f HS	216	if (str_format & UUID_STR_UPPER_CASE)
3bad256f HS	217	format = "%02X";
d718ded0	218	else
3bad256f	219	format = "%02x";
d718ded0	220
a96a0e61	221	for (i = 0; i < 16; i++) {
3bad256f	222	sprintf(uuid_str, format, uuid_bin[char_order[i]]);
d718ded0	223	uuid_str += 2;
a96a0e61 PM	224	switch (i) {
	225	case 3:
	226	case 5:
	227	case 7:
	228	case 9:
d718ded0	229	*uuid_str++ = '-';
a96a0e61 PM	230	break;
	231	}
	232	}
e11938ea	233	}
4e4815fe PM	234
	235	/*
	236	* gen_rand_uuid() - this function generates a random binary UUID version 4.
	237	* In this version all fields beside 4 bits of version and
	238	* 2 bits of variant are randomly generated.
	239	*
	240	* @param uuid_bin - pointer to allocated array [16B]. Output is in big endian.
	241	*/
89c8230d	242	#if defined(CONFIG_RANDOM_UUID) \|\| defined(CONFIG_CMD_UUID)
4e4815fe PM	243	void gen_rand_uuid(unsigned char *uuid_bin)
4e4815fe PM	244	{
a1b633df HS	245	u32 ptr[4];
a1b633df HS	246	struct uuid uuid = (struct uuid )ptr;
4e4815fe PM	247	int i;
4e4815fe PM	248
4ccf678f ER	249	srand(get_ticks() + rand());
4ccf678f ER	250
4e4815fe	251	/* Set all fields randomly */
a1b633df HS	252	for (i = 0; i < 4; i++)
a1b633df HS	253	ptr[i] = rand();
4e4815fe	254
a1b633df	255	clrsetbits_be16(&uuid->time_hi_and_version,
4e4815fe PM	256	UUID_VERSION_MASK,
	257	UUID_VERSION << UUID_VERSION_SHIFT);
	258
a1b633df	259	clrsetbits_8(&uuid->clock_seq_hi_and_reserved,
4e4815fe PM	260	UUID_VARIANT_MASK,
	261	UUID_VARIANT << UUID_VARIANT_SHIFT);
	262
a1b633df	263	memcpy(uuid_bin, uuid, 16);
4e4815fe PM	264	}
	265
	266	/*
	267	* gen_rand_uuid_str() - this function generates UUID v4 (random) in two string
	268	* formats UUID or GUID.
	269	*
	270	* @param uuid_str - pointer to allocated array [37B].
	271	* @param - uuid output type: UUID - 0, GUID - 1
	272	*/
	273	void gen_rand_uuid_str(char *uuid_str, int str_format)
	274	{
	275	unsigned char uuid_bin[UUID_BIN_LEN];
	276
	277	/* Generate UUID (big endian) */
	278	gen_rand_uuid(uuid_bin);
	279
	280	/* Convert UUID bin to UUID or GUID formated STRING */
	281	uuid_bin_to_str(uuid_bin, uuid_str, str_format);
	282	}
89c8230d	283
05f6da3f	284	#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_CMD_UUID)
89c8230d PM	285	int do_uuid(cmd_tbl_t cmdtp, int flag, int argc, char const argv[])
	286	{
	287	char uuid[UUID_STR_LEN + 1];
	288	int str_format;
	289
	290	if (!strcmp(argv[0], "uuid"))
	291	str_format = UUID_STR_FORMAT_STD;
	292	else
	293	str_format = UUID_STR_FORMAT_GUID;
	294
	295	if (argc > 2)
	296	return CMD_RET_USAGE;
	297
	298	gen_rand_uuid_str(uuid, str_format);
	299
	300	if (argc == 1)
	301	printf("%s\n", uuid);
	302	else
382bee57	303	env_set(argv[1], uuid);
89c8230d PM	304
	305	return CMD_RET_SUCCESS;
	306	}
	307
	308	U_BOOT_CMD(uuid, CONFIG_SYS_MAXARGS, 1, do_uuid,
	309	"UUID - generate random Universally Unique Identifier",
	310	"[<varname>]\n"
	311	"Argument:\n"
	312	"varname: for set result in a environment variable\n"
	313	"e.g. uuid uuid_env"
	314	);
	315
	316	U_BOOT_CMD(guid, CONFIG_SYS_MAXARGS, 1, do_uuid,
	317	"GUID - generate Globally Unique Identifier based on random UUID",
	318	"[<varname>]\n"
	319	"Argument:\n"
	320	"varname: for set result in a environment variable\n"
	321	"e.g. guid guid_env"
	322	);
39206382 PM	323	#endif /* CONFIG_CMD_UUID */
39206382 PM	324	#endif /* CONFIG_RANDOM_UUID \|\| CONFIG_CMD_UUID */