3745c395ec
to kproc_xxx as they actually make whole processes. Thos makes way for us to add REAL kthread_create() and friends that actually make theads. it turns out that most of these calls actually end up being moved back to the thread version when it's added. but we need to make this cosmetic change first. I'd LOVE to do this rename in 7.0 so that we can eventually MFC the new kthread_xxx() calls.
136 lines
4.0 KiB
C
136 lines
4.0 KiB
C
/*-
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* Copyright (c) 2000-2004 Mark R V Murray
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/kthread.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/poll.h>
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#include <sys/queue.h>
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#include <sys/random.h>
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#include <sys/selinfo.h>
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#include <sys/systm.h>
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#include <sys/sysctl.h>
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#include <machine/cpu.h>
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#include <dev/random/randomdev_soft.h>
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static int read_random_phony(void *, int);
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/* Structure holding the desired entropy sources */
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struct harvest_select harvest = { 1, 1, 1, 0 };
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/* hold the address of the routine which is actually called if
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* the randomdev is loaded
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*/
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static void (*reap_func)(u_int64_t, const void *, u_int, u_int, u_int,
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enum esource) = NULL;
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static int (*read_func)(void *, int) = read_random_phony;
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/* Initialise the harvester at load time */
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void
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random_yarrow_init_harvester(void (*reaper)(u_int64_t, const void *, u_int,
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u_int, u_int, enum esource), int (*reader)(void *, int))
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{
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reap_func = reaper;
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read_func = reader;
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}
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/* Deinitialise the harvester at unload time */
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void
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random_yarrow_deinit_harvester(void)
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{
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reap_func = NULL;
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read_func = read_random_phony;
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}
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/* Entropy harvesting routine. This is supposed to be fast; do
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* not do anything slow in here!
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* Implemented as in indirect call to allow non-inclusion of
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* the entropy device.
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*
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* XXXRW: get_cyclecount() is cheap on most modern hardware, where cycle
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* counters are built in, but on older hardware it will do a real time clock
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* read which can be quite expensive.
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*/
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void
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random_harvest(void *entropy, u_int count, u_int bits, u_int frac,
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enum esource origin)
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{
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if (reap_func)
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(*reap_func)(get_cyclecount(), entropy, count, bits, frac,
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origin);
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}
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/* Userland-visible version of read_random */
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int
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read_random(void *buf, int count)
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{
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return ((*read_func)(buf, count));
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}
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/* If the entropy device is not loaded, make a token effort to
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* provide _some_ kind of randomness. This should only be used
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* inside other RNG's, like arc4random(9).
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*/
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static int
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read_random_phony(void *buf, int count)
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{
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u_long randval;
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int size, i;
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/* srandom() is called in kern/init_main.c:proc0_post() */
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/* Fill buf[] with random(9) output */
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for (i = 0; i < count; i+= (int)sizeof(u_long)) {
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randval = random();
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size = MIN(count - i, sizeof(u_long));
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memcpy(&((char *)buf)[i], &randval, (size_t)size);
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}
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return (count);
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}
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/* Helper routine to enable kproc_exit() to work while the module is
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* being (or has been) unloaded.
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* This routine is in this file because it is always linked into the kernel,
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* and will thus never be unloaded. This is critical for unloadable modules
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* that have threads.
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*/
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void
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random_set_wakeup_exit(void *control)
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{
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wakeup(control);
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kproc_exit(0);
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/* NOTREACHED */
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}
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