projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| fab1c232 HY |
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/module.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); |