1/*-
2 * Copyright (c) 2013 Arthur Mesh <arthurmesh@gmail.com>
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_DEV_RANDOM_RANDOM_ADAPTORS_H_INCLUDED
30#define SYS_DEV_RANDOM_RANDOM_ADAPTORS_H_INCLUDED
31
32#include <sys/eventhandler.h>
33
34MALLOC_DECLARE(M_ENTROPY);
35
36struct random_adaptors {
37	LIST_ENTRY(random_adaptors) entries;	/* list of providers */
38	const char		*name;		/* name of random adaptor */
39	struct random_adaptor	*rsp;
40};
41
42struct random_adaptor *random_adaptor_get(const char *);
43int random_adaptor_register(const char *, struct random_adaptor *);
44void random_adaptor_choose(struct random_adaptor **);
45
46extern struct random_adaptor *random_adaptor;
47
48/*
49 * random_adaptor's should be registered prior to
50 * random module (SI_SUB_DRIVERS/SI_ORDER_MIDDLE)
51 */
52#define RANDOM_ADAPTOR_MODULE(name, modevent, ver)		\
53    static moduledata_t name##_mod = {				\
54	#name,							\
55	modevent,						\
56	0							\
57    };								\
58    DECLARE_MODULE(name, name##_mod, SI_SUB_DRIVERS,		\
59		   SI_ORDER_SECOND);				\
60    MODULE_VERSION(name, ver);					\
61    MODULE_DEPEND(name, random, 1, 1, 1);
62
63typedef void (*random_adaptor_attach_hook)(void *, struct random_adaptor *);
64EVENTHANDLER_DECLARE(random_adaptor_attach, random_adaptor_attach_hook);
65
66/* kern.random sysctls */
67#ifdef SYSCTL_DECL	/* from sysctl.h */
68SYSCTL_DECL(_kern_random);
69#endif /* SYSCTL_DECL */
70
71#endif /* SYS_DEV_RANDOM_RANDOM_ADAPTORS_H_INCLUDED */
72