1 .\" Copyright (c) 2010 Konstantin Belousov <kib@FreeBSD.org>
2 .\" All rights reserved.
4 .\" Redistribution and use in source and binary forms, with or without
5 .\" modification, are permitted provided that the following conditions
7 .\" 1. Redistributions of source code must retain the above copyright
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25 .\" $FreeBSD: src/share/man/man4/aesni.4,v 1.3 2010/09/09 21:37:05 brueffer Exp $
32 .Nd "driver for the RNG module on Intel CPUs"
34 To compile this driver into the kernel,
35 place the following lines in your
36 kernel configuration file:
37 .Bd -ragged -offset indent
41 Alternatively, to load the driver as a
42 module at boot time, place the following line in
44 .Bd -literal -offset indent
48 WARNING: This driver is still untested.
50 Starting with some models of the Ivy Bridge Core i5/i7, Intel processors
51 implement a new set of instructions called RdRand.
52 This set of instructions uses a hardware based RNG providing
53 high-speed true randomness.
55 The processor capability is reported as RDRND in the Features2 line at boot.
58 driver does not attach on systems that lack the required CPU capability.
62 driver continuously feeds entropy to the kernel's random number generator.
70 driver first appeared in
77 .An Alex Hornung Aq Mt alex@alexhornung.com .