1/*-
2 * Copyright (c) 2000 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 * $FreeBSD$
27 */
28
29#ifndef	_SYS_RANDOM_H_
30#define	_SYS_RANDOM_H_
31
32#ifdef _KERNEL
33
34int read_random(void *, int);
35
36/*
37 * Note: if you add or remove members of esource, remember to also update the
38 * KASSERT regarding what valid members are in random_harvest_internal().
39 */
40enum esource {
41	RANDOM_START = 0,
42	RANDOM_WRITE = 0,
43	RANDOM_KEYBOARD,
44	RANDOM_MOUSE,
45	RANDOM_NET,
46	RANDOM_INTERRUPT,
47	RANDOM_PURE,
48	ENTROPYSOURCE
49};
50void random_harvest(void *, u_int, u_int, u_int, enum esource);
51
52/* Allow the sysadmin to select the broad category of
53 * entropy types to harvest
54 */
55struct harvest_select {
56	int ethernet;
57	int point_to_point;
58	int interrupt;
59	int swi;
60};
61
62extern struct harvest_select harvest;
63
64#endif /* _KERNEL */
65
66#endif /* _SYS_RANDOM_H_ */
67