2 * Unified UUID/GUID definition
4 * Copyright (C) 2009, Intel Corp.
5 * Huang Ying <ying.huang@intel.com>
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License version
9 * 2 as published by the Free Software Foundation;
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #include <linux/kernel.h>
22 #include <linux/export.h>
23 #include <linux/uuid.h>
24 #include <linux/random.h>
26 /***************************************************************
27 * Random UUID interface
29 * Used here for a Boot ID, but can be useful for other kernel
31 ***************************************************************/
34 * Generate random UUID
36 void generate_random_uuid(unsigned char uuid
[16])
38 get_random_bytes(uuid
, 16);
39 /* Set UUID version to 4 --- truly random generation */
40 uuid
[6] = (uuid
[6] & 0x0F) | 0x40;
41 /* Set the UUID variant to DCE */
42 uuid
[8] = (uuid
[8] & 0x3F) | 0x80;
44 EXPORT_SYMBOL(generate_random_uuid
);
46 static void __uuid_gen_common(__u8 b
[16])
50 b
[8] = (b
[8] & 0x3F) | 0x80;
53 void uuid_le_gen(uuid_le
*lu
)
55 __uuid_gen_common(lu
->b
);
56 /* version 4 : random generation */
57 lu
->b
[7] = (lu
->b
[7] & 0x0F) | 0x40;
59 EXPORT_SYMBOL_GPL(uuid_le_gen
);
61 void uuid_be_gen(uuid_be
*bu
)
63 __uuid_gen_common(bu
->b
);
64 /* version 4 : random generation */
65 bu
->b
[6] = (bu
->b
[6] & 0x0F) | 0x40;
67 EXPORT_SYMBOL_GPL(uuid_be_gen
);