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 * $FreeBSD$ 27 */ 28 29 #ifndef SYS_DEV_RANDOM_RANDOM_HARVESTQ_H_INCLUDED 30 #define SYS_DEV_RANDOM_RANDOM_HARVESTQ_H_INCLUDED 31 32 #define HARVESTSIZE 2 /* Max length in words of each harvested entropy unit */ 33 34 /* These are used to queue harvested packets of entropy. The entropy 35 * buffer size is pretty arbitrary. 36 */ 37 struct harvest_event { 38 uint32_t he_somecounter; /* fast counter for clock jitter */ 39 uint32_t he_entropy[HARVESTSIZE];/* some harvested entropy */ 40 uint8_t he_size; /* harvested entropy byte count */ 41 uint8_t he_destination; /* destination pool of this entropy */ 42 uint8_t he_source; /* origin of the entropy */ 43 }; 44 45 #define RANDOM_HARVEST_INIT_LOCK(x) mtx_init(&harvest_context.hc_mtx, "entropy harvest mutex", NULL, MTX_SPIN) 46 #define RANDOM_HARVEST_LOCK(x) mtx_lock_spin(&harvest_context.hc_mtx) 47 #define RANDOM_HARVEST_UNLOCK(x) mtx_unlock_spin(&harvest_context.hc_mtx) 48 49 #endif /* SYS_DEV_RANDOM_RANDOM_HARVESTQ_H_INCLUDED */ 50