The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/random/random_harvestq.h

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    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: head/sys/dev/random/random_harvestq.h 338324 2018-08-26 12:51:46Z markm $
   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 void read_rate_increment(u_int);
   46 
   47 #define RANDOM_HARVEST_INIT_LOCK(x)     mtx_init(&harvest_context.hc_mtx, "entropy harvest mutex", NULL, MTX_SPIN)
   48 #define RANDOM_HARVEST_LOCK(x)          mtx_lock_spin(&harvest_context.hc_mtx)
   49 #define RANDOM_HARVEST_UNLOCK(x)        mtx_unlock_spin(&harvest_context.hc_mtx)
   50 
   51 #endif /* SYS_DEV_RANDOM_RANDOM_HARVESTQ_H_INCLUDED */

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