2 * Copyright (c) 2004 Mark R V Murray
5 * Redistribution and use in source and binary forms, with or without
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.
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.
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.
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
31 #include <sys/types.h>
32 #include <sys/param.h>
33 #include <sys/malloc.h>
34 #include <sys/random.h>
35 #include <sys/selinfo.h>
36 #include <sys/stdint.h>
37 #include <sys/sysctl.h>
39 #if defined(__i386__) && !defined(PC98)
40 #include <machine/cpufunc.h>
41 #include <machine/cputypes.h>
44 #include <dev/random/randomdev.h>
45 #include <dev/random/randomdev_soft.h>
46 #include <dev/random/nehemiah.h>
49 random_ident_hardware(struct random_systat *systat)
51 #if defined(__i386__) && !defined(PC98)
55 /* Set default to software */
56 *systat = random_yarrow;
58 /* Then go looking for hardware */
59 #if defined(__i386__) && !defined(PC98)
60 if (cpu_class < CPUCLASS_586)
63 if ((regs[0] & 0xf) >= 3) {
64 do_cpuid(0xc0000000, regs);
65 if (regs[0] == 0xc0000001) {
66 do_cpuid(0xc0000001, regs);
67 if ((regs[3] & 0x0c) == 0x0c)
68 *systat = random_nehemiah;