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Linux/lib/uuid.c

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  1 /*
  2  * Unified UUID/GUID definition
  3  *
  4  * Copyright (C) 2009, Intel Corp.
  5  *      Huang Ying <ying.huang@intel.com>
  6  *
  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;
 10  *
 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.
 15  *
 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
 19  */
 20 
 21 #include <linux/kernel.h>
 22 #include <linux/export.h>
 23 #include <linux/uuid.h>
 24 #include <linux/random.h>
 25 
 26 static void __uuid_gen_common(__u8 b[16])
 27 {
 28         int i;
 29         u32 r;
 30 
 31         for (i = 0; i < 4; i++) {
 32                 r = random32();
 33                 memcpy(b + i * 4, &r, 4);
 34         }
 35         /* reversion 0b10 */
 36         b[8] = (b[8] & 0x3F) | 0x80;
 37 }
 38 
 39 void uuid_le_gen(uuid_le *lu)
 40 {
 41         __uuid_gen_common(lu->b);
 42         /* version 4 : random generation */
 43         lu->b[7] = (lu->b[7] & 0x0F) | 0x40;
 44 }
 45 EXPORT_SYMBOL_GPL(uuid_le_gen);
 46 
 47 void uuid_be_gen(uuid_be *bu)
 48 {
 49         __uuid_gen_common(bu->b);
 50         /* version 4 : random generation */
 51         bu->b[6] = (bu->b[6] & 0x0F) | 0x40;
 52 }
 53 EXPORT_SYMBOL_GPL(uuid_be_gen);
 54 

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