/*
   * Unified UUID/GUID definition
   *
   * Copyright (C) 2009, Intel Corp.
   *	Huang Ying <ying.huang@intel.com>
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License version
   * 2 as published by the Free Software Foundation;
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   */
  
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/uuid.h>
  #include <linux/random.h>
  
  static void __uuid_gen_common(__u8 b[16])
  {
  	int i;
  	u32 r;
  
  	for (i = 0; i < 4; i++) {
  		r = random32();
  		memcpy(b + i * 4, &r, 4);
  	}
  	/* reversion 0b10 */
  	b[8] = (b[8] & 0x3F) | 0x80;
  }
  
  void uuid_le_gen(uuid_le *lu)
  {
  	__uuid_gen_common(lu->b);
  	/* version 4 : random generation */
  	lu->b[7] = (lu->b[7] & 0x0F) | 0x40;
  }
  EXPORT_SYMBOL_GPL(uuid_le_gen);
  
  void uuid_be_gen(uuid_be *bu)
  {
  	__uuid_gen_common(bu->b);
  	/* version 4 : random generation */
  	bu->b[6] = (bu->b[6] & 0x0F) | 0x40;
  }
  EXPORT_SYMBOL_GPL(uuid_be_gen);