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/*-
* Copyright (c) 2013-2015 Mark R V Murray
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer
* in this position and unchanged.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef SYS_DEV_RANDOM_RANDOM_HARVESTQ_H_INCLUDED
#define SYS_DEV_RANDOM_RANDOM_HARVESTQ_H_INCLUDED
#define HARVESTSIZE 2 /* Max length in words of each harvested entropy unit */
/* These are used to queue harvested packets of entropy. The entropy
* buffer size is pretty arbitrary.
*/
struct harvest_event {
uint32_t he_somecounter; /* fast counter for clock jitter */
uint32_t he_entropy[HARVESTSIZE];/* some harvested entropy */
uint8_t he_size; /* harvested entropy byte count */
uint8_t he_bits; /* stats about the entropy */
uint8_t he_destination; /* destination pool of this entropy */
uint8_t he_source; /* origin of the entropy */
} __packed;
void read_rate_increment(u_int);
#define RANDOM_HARVESTQ_BOOT_ENTROPY_FILE "/boot/entropy"
#define RANDOM_HARVEST_INIT_LOCK(x) mtx_init(&harvest_context.hc_mtx, "entropy harvest mutex", NULL, MTX_SPIN)
#define RANDOM_HARVEST_LOCK(x) mtx_lock_spin(&harvest_context.hc_mtx)
#define RANDOM_HARVEST_UNLOCK(x) mtx_unlock_spin(&harvest_context.hc_mtx)
#endif /* SYS_DEV_RANDOM_RANDOM_HARVESTQ_H_INCLUDED */
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