1 /*-
2 * Copyright (c) 2013-2015, 2017 Mark R V Murray
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer
10 * in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #ifndef SYS_DEV_RANDOM_RANDOM_HARVESTQ_H_INCLUDED
28 #define SYS_DEV_RANDOM_RANDOM_HARVESTQ_H_INCLUDED
29
30 #include <sys/types.h>
31 #include <machine/cpu.h>
32
33 #define HARVESTSIZE 2 /* Max length in words of each harvested entropy unit */
34
35 /* These are used to queue harvested packets of entropy. The entropy
36 * buffer size is pretty arbitrary.
37 */
38 struct harvest_event {
39 uint32_t he_somecounter; /* fast counter for clock jitter */
40 uint32_t he_entropy[HARVESTSIZE];/* some harvested entropy */
41 uint8_t he_size; /* harvested entropy byte count */
42 uint8_t he_destination; /* destination pool of this entropy */
43 uint8_t he_source; /* origin of the entropy */
44 };
45
46 static inline uint32_t
random_get_cyclecount(void)47 random_get_cyclecount(void)
48 {
49 return ((uint32_t)get_cyclecount());
50 }
51
52 #endif /* SYS_DEV_RANDOM_RANDOM_HARVESTQ_H_INCLUDED */
53