Those commands basis on implementation of random UUID generator version 4 which is described in RFC4122. The same algorithm is used for generation both ids but string representation is different as below.
char: 0 9 14 19 24 36 xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx UUID: be be be be be GUID: le le le be be Commands usage: - uuid <varname(optional)> - guid <varname(optional)> The result is saved in environment as a "varname" variable if argument is given, if not then its printed. New config: - CONFIG_CMD_UUID Signed-off-by: Przemyslaw Marczak <p.marc...@samsung.com> Cc: Stephen Warren <swar...@nvidia.com> Cc: Lukasz Majewski <l.majew...@samsung.com> Cc: tr...@ti.com --- Changes v4: - new commit --- README | 2 +- include/common.h | 4 +++- lib/Makefile | 2 ++ lib/uuid.c | 44 +++++++++++++++++++++++++++++++++++++++++++- 4 files changed, 49 insertions(+), 3 deletions(-) diff --git a/README b/README index 216f0c7..f69b94e 100644 --- a/README +++ b/README @@ -1012,7 +1012,7 @@ The following options need to be configured: CONFIG_CMD_CDP * Cisco Discover Protocol support CONFIG_CMD_MFSL * Microblaze FSL support CONFIG_CMD_XIMG Load part of Multi Image - + CONFIG_CMD_UUID * Generate random UUID or GUID string EXAMPLE: If you want all functions except of network support you can write: diff --git a/include/common.h b/include/common.h index deb08f2..de748f1 100644 --- a/include/common.h +++ b/include/common.h @@ -831,7 +831,9 @@ char * strmhz(char *buf, unsigned long hz); #if defined(CONFIG_RANDOM_MACADDR) || \ defined(CONFIG_BOOTP_RANDOM_DELAY) || \ defined(CONFIG_CMD_LINK_LOCAL) || \ - defined(CONFIG_RANDOM_UUID) + defined(CONFIG_RANDOM_UUID) || \ + defined(CONFIG_CMD_UUID) + #define RAND_MAX -1U void srand(unsigned int seed); unsigned int rand(void); diff --git a/lib/Makefile b/lib/Makefile index fd75e80..b85c825 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -65,6 +65,8 @@ obj-$(CONFIG_PARTITION_UUIDS) += uuid.o obj-y += vsprintf.o obj-$(CONFIG_RANDOM_UUID) += uuid.o obj-$(CONFIG_RANDOM_UUID) += rand.o +obj-$(CONFIG_CMD_UUID) += uuid.o +obj-$(CONFIG_CMD_UUID) += rand.o obj-$(CONFIG_RANDOM_MACADDR) += rand.o obj-$(CONFIG_BOOTP_RANDOM_DELAY) += rand.o obj-$(CONFIG_CMD_LINK_LOCAL) += rand.o diff --git a/lib/uuid.c b/lib/uuid.c index d3ba60e..0112b03 100644 --- a/lib/uuid.c +++ b/lib/uuid.c @@ -4,6 +4,7 @@ * SPDX-License-Identifier: GPL-2.0+ */ +#include <common.h> #include <linux/ctype.h> #include <errno.h> #include <common.h> @@ -172,7 +173,7 @@ void uuid_bin_to_str(unsigned char *uuid_bin, char *uuid_str, * * @param uuid_bin - pointer to allocated array [16B]. Output is in big endian. */ -#ifdef CONFIG_RANDOM_UUID +#if defined(CONFIG_RANDOM_UUID) || defined(CONFIG_CMD_UUID) void gen_rand_uuid(unsigned char *uuid_bin) { struct uuid uuid; @@ -211,4 +212,45 @@ void gen_rand_uuid_str(char *uuid_str, uuid_str_t str_format) /* Convert UUID bin to UUID or GUID formated STRING */ uuid_bin_to_str(uuid_bin, uuid_str, str_format); } + +#ifdef CONFIG_CMD_UUID +int do_uuid(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) +{ + char uuid[UUID_STR_LEN + 1]; + uuid_str_t str_format; + + if (!strcmp(argv[0], "uuid")) + str_format = UUID_STR_FORMAT_STD; + else + str_format = UUID_STR_FORMAT_GUID; + + if (argc == 1) { + gen_rand_uuid_str(uuid, str_format); + printf("%s\n", uuid); + } else if (argc == 2) { + gen_rand_uuid_str(uuid, str_format); + setenv(argv[1], uuid); + } else { + return CMD_RET_USAGE; + } + + return CMD_RET_SUCCESS; +} + +U_BOOT_CMD(uuid, CONFIG_SYS_MAXARGS, 1, do_uuid, + "UUID - generate Universally Unique Identifier version 4", + "<varname(optional)>\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 UUID version 4", + "<varname(optional)>\n" + "Argument:\n" + "varname: for set result in a environment variable\n" + "e.g. guid guid_env" +); +#endif #endif -- 1.9.0 _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot