1 /*
2 * Copyright © 2016 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 */
23
24 #ifndef IGT_RAND_H
25 #define IGT_RAND_H
26
27 #include <stdint.h>
28
29 uint32_t hars_petruska_f54_1_random(uint32_t *state);
30
31 uint32_t hars_petruska_f54_1_random_seed(uint32_t seed);
32 uint32_t hars_petruska_f54_1_random_unsafe(void);
33
hars_petruska_f54_1_random_perturb(uint32_t xor)34 static inline void hars_petruska_f54_1_random_perturb(uint32_t xor)
35 {
36 uint32_t seed = hars_petruska_f54_1_random_seed(0) ^ xor;
37 hars_petruska_f54_1_random_seed(seed);
38 hars_petruska_f54_1_random_seed(hars_petruska_f54_1_random_unsafe());
39 }
40
41 /* Returns: pseudo-random number in interval [0, ep_ro) */
hars_petruska_f54_1_random_unsafe_max(uint32_t ep_ro)42 static inline uint32_t hars_petruska_f54_1_random_unsafe_max(uint32_t ep_ro)
43 {
44 return ((uint64_t)hars_petruska_f54_1_random_unsafe() * ep_ro) >> 32;
45 }
46
47 #endif /* IGT_RAND_H */
48