2 * Copyright (c) 2013-2015 Mark R V Murray
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6 * modification, are permitted provided that the following conditions
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.
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13 * documentation and/or other materials provided with the distribution.
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29 #ifndef SYS_DEV_RANDOM_RANDOM_HARVESTQ_H_INCLUDED
30 #define SYS_DEV_RANDOM_RANDOM_HARVESTQ_H_INCLUDED
32 #define HARVESTSIZE 2 /* Max length in words of each harvested entropy unit */
34 /* These are used to queue harvested packets of entropy. The entropy
35 * buffer size is pretty arbitrary.
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_bits; /* stats about the entropy */
42 uint8_t he_destination; /* destination pool of this entropy */
43 uint8_t he_source; /* origin of the entropy */
46 void read_rate_increment(u_int);
48 #define RANDOM_HARVESTQ_BOOT_ENTROPY_FILE "/boot/entropy"
50 #define RANDOM_HARVEST_INIT_LOCK(x) mtx_init(&harvest_context.hc_mtx, "entropy harvest mutex", NULL, MTX_SPIN)
51 #define RANDOM_HARVEST_LOCK(x) mtx_lock_spin(&harvest_context.hc_mtx)
52 #define RANDOM_HARVEST_UNLOCK(x) mtx_unlock_spin(&harvest_context.hc_mtx)
54 #endif /* SYS_DEV_RANDOM_RANDOM_HARVESTQ_H_INCLUDED */