94 lines
2.7 KiB
C
94 lines
2.7 KiB
C
/*-
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* Copyright (c) 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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#if defined(__amd64__) || (defined(__i386__) && !defined(PC98))
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#include "opt_cpu.h"
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#endif
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/random.h>
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#include <sys/selinfo.h>
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#include <sys/sysctl.h>
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#if defined(__amd64__) || (defined(__i386__) && !defined(PC98))
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#include <machine/cpufunc.h>
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#include <machine/cputypes.h>
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#include <machine/md_var.h>
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#include <machine/specialreg.h>
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#endif
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#include <dev/random/randomdev.h>
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#include <dev/random/randomdev_soft.h>
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#if defined(__amd64__) || (defined(__i386__) && !defined(PC98))
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#ifdef PADLOCK_RNG
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extern struct random_systat random_nehemiah;
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#endif
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#ifdef RDRAND_RNG
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extern struct random_systat random_ivy;
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#endif
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#endif
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void
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random_ident_hardware(struct random_systat *systat)
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{
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/* Set default to software */
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*systat = random_yarrow;
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/* Then go looking for hardware */
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#if defined(__amd64__) || (defined(__i386__) && !defined(PC98))
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#ifdef PADLOCK_RNG
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if (via_feature_rng & VIA_HAS_RNG) {
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int enable;
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enable = 1;
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TUNABLE_INT_FETCH("hw.nehemiah_rng_enable", &enable);
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if (enable)
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*systat = random_nehemiah;
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}
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#endif
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#ifdef RDRAND_RNG
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if (cpu_feature2 & CPUID2_RDRAND) {
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int enable;
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enable = 1;
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TUNABLE_INT_FETCH("hw.ivy_rng_enable", &enable);
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if (enable)
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*systat = random_ivy;
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}
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#endif
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#endif
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}
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