15  * UUID - Universally Unique IDentifier - 128 bits unique number.
16  *        There are 5 versions and one variant of UUID defined by RFC4122
17  *        specification. A UUID contains a set of fields. The set varies
18  *        depending on the version of the UUID, as shown below:
25  * Layout of UUID:
34  * UUID binary format (16 bytes):
38  * UUID string is 36 length of characters (36 bytes):
45  * When converting to a binary UUID, le means the field should be converted
48  * UUID is also used as GUID (Globally Unique Identifier) with the same binary
58 int uuid_str_valid(const char *uuid)  in uuid_str_valid()  argument
62 	if (uuid == NULL)  in uuid_str_valid()
65 	for (i = 0, valid = 1; uuid[i] && valid; i++) {  in uuid_str_valid()
68 			valid = (uuid[i] == '-');  in uuid_str_valid()
71 			valid = isxdigit(uuid[i]);  in uuid_str_valid()
138  * uuid_str_to_bin() - convert string UUID or GUID to big endian binary data.
140  * @param uuid_str - pointer to UUID or GUID string [37B] or GUID shorcut
142  * @str_format     - UUID string format: 0 - UUID; 1 - GUID
188  * uuid_bin_to_str() - convert big endian binary data to string UUID or GUID.
190  * @param uuid_bin - pointer to binary data of UUID (big endian) [16B]
192  * @str_format     - UUID string format: 0 - UUID; 1 - GUID
204 	 * UUID and GUID bin data - always in big endian:  in uuid_bin_to_str()
228  * gen_rand_uuid() - this function generates a random binary UUID version 4.
237 	struct uuid uuid;  in gen_rand_uuid()  local
238 	unsigned int *ptr = (unsigned int *)&uuid;  in gen_rand_uuid()
242 	for (i = 0; i < sizeof(struct uuid) / sizeof(*ptr); i++)  in gen_rand_uuid()
245 	clrsetbits_be16(&uuid.time_hi_and_version,  in gen_rand_uuid()
249 	clrsetbits_8(&uuid.clock_seq_hi_and_reserved,  in gen_rand_uuid()
253 	memcpy(uuid_bin, &uuid, sizeof(struct uuid));  in gen_rand_uuid()
257  * gen_rand_uuid_str() - this function generates UUID v4 (random) in two string
258  *                       formats UUID or GUID.
261  * @param          - uuid output type: UUID - 0, GUID - 1
267 	/* Generate UUID (big endian) */  in gen_rand_uuid_str()
270 	/* Convert UUID bin to UUID or GUID formated STRING  */  in gen_rand_uuid_str()
277 	char uuid[UUID_STR_LEN + 1];  in do_uuid()  local
280 	if (!strcmp(argv[0], "uuid"))  in do_uuid()
288 	gen_rand_uuid_str(uuid, str_format);  in do_uuid()
291 		printf("%s\n", uuid);  in do_uuid()
293 		env_set(argv[1], uuid);  in do_uuid()
298 U_BOOT_CMD(uuid, CONFIG_SYS_MAXARGS, 1, do_uuid,
299 	   "UUID - generate random Universally Unique Identifier",
303 	   "e.g. uuid uuid_env"
307 	   "GUID - generate Globally Unique Identifier based on random UUID",