From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- Documentation/hw_random.txt | 69 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 69 insertions(+) create mode 100644 Documentation/hw_random.txt (limited to 'Documentation/hw_random.txt') diff --git a/Documentation/hw_random.txt b/Documentation/hw_random.txt new file mode 100644 index 000000000000..bb58c36b5845 --- /dev/null +++ b/Documentation/hw_random.txt @@ -0,0 +1,69 @@ + Hardware driver for Intel/AMD/VIA Random Number Generators (RNG) + Copyright 2000,2001 Jeff Garzik + Copyright 2000,2001 Philipp Rumpf + +Introduction: + + The hw_random device driver is software that makes use of a + special hardware feature on your CPU or motherboard, + a Random Number Generator (RNG). + + In order to make effective use of this device driver, you + should download the support software as well. Download the + latest version of the "rng-tools" package from the + hw_random driver's official Web site: + + http://sourceforge.net/projects/gkernel/ + +About the Intel RNG hardware, from the firmware hub datasheet: + + The Firmware Hub integrates a Random Number Generator (RNG) + using thermal noise generated from inherently random quantum + mechanical properties of silicon. When not generating new random + bits the RNG circuitry will enter a low power state. Intel will + provide a binary software driver to give third party software + access to our RNG for use as a security feature. At this time, + the RNG is only to be used with a system in an OS-present state. + +Theory of operation: + + Character driver. Using the standard open() + and read() system calls, you can read random data from + the hardware RNG device. This data is NOT CHECKED by any + fitness tests, and could potentially be bogus (if the + hardware is faulty or has been tampered with). Data is only + output if the hardware "has-data" flag is set, but nevertheless + a security-conscious person would run fitness tests on the + data before assuming it is truly random. + + /dev/hwrandom is char device major 10, minor 183. + +Driver notes: + + * FIXME: support poll(2) + + NOTE: request_mem_region was removed, for two reasons: + 1) Only one RNG is supported by this driver, 2) The location + used by the RNG is a fixed location in MMIO-addressable memory, + 3) users with properly working BIOS e820 handling will always + have the region in which the RNG is located reserved, so + request_mem_region calls always fail for proper setups. + However, for people who use mem=XX, BIOS e820 information is + -not- in /proc/iomem, and request_mem_region(RNG_ADDR) can + succeed. + +Driver details: + + Based on: + Intel 82802AB/82802AC Firmware Hub (FWH) Datasheet + May 1999 Order Number: 290658-002 R + + Intel 82802 Firmware Hub: Random Number Generator + Programmer's Reference Manual + December 1999 Order Number: 298029-001 R + + Intel 82802 Firmware HUB Random Number Generator Driver + Copyright (c) 2000 Matt Sottek + + Special thanks to Matt Sottek. I did the "guts", he + did the "brains" and all the testing. -- cgit