67 lines
2.2 KiB
C
67 lines
2.2 KiB
C
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/*-
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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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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/selinfo.h>
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#include <dev/random/randomdev.h>
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static int random_nehemiah_read(void *, int);
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struct random_systat random_nehemiah = {
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.ident = "Hardware, VIA Nehemiah",
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.init = (random_init_func_t *)random_null_func,
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.deinit = (random_deinit_func_t *)random_null_func,
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.read = random_nehemiah_read,
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.write = (random_write_func_t *)random_null_func,
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.reseed = (random_reseed_func_t *)random_null_func,
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.seeded = 1,
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};
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/* ARGSUSED */
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static int
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random_nehemiah_read(void *buf, int c)
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{
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#if (defined(__GNUC__) || defined(__INTEL_COMPILER)) && defined(__i386__)
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int count = c;
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int rate = 0;
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/* VIA C3 Nehemiah "rep; xstore" */
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__asm __volatile("rep; .byte 0x0f, 0xa7, 0xc0"
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: "+D" (buf), "+c" (count), "=d" (rate)
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:
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: "memory");
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#endif
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return (c);
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}
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