1) example (partially humorous random_adaptor, that I call "EXAMPLE")

 * It's not meant to be used in a real system, it's there to show how
   the basics of how to create interfaces for random_adaptors. Perhaps
   it should belong in a manual page

2) Move probe.c's functionality in to random_adaptors.c
 * rename random_ident_hardware() to random_adaptor_choose()

3) Introduce a new way to choose (or select) random_adaptors via tunable
"rngs_want" It's a list of comma separated names of adaptors, ordered
by preferences. I.e.:
rngs_want="yarrow,rdrand"

Such setting would cause yarrow to be preferred to rdrand. If neither of
them are available (or registered), then system will default to
something reasonable (currently yarrow). If yarrow is not present, then
we fall back to the adaptor that's first on the list of registered
adaptors.

4) Introduce a way where RNGs can play a role of entropy source. This is
mostly useful for HW rngs.

The way I envision this is that every HW RNG will use this
functionality by default. Functionality to disable this is also present.
I have an example of how to use this in random_adaptor_example.c (see
modload event, and init function)

5) fix kern.random.adaptors from
kern.random.adaptors: yarrowpanicblock
to
kern.random.adaptors: yarrow,panic,block

6) add kern.random.active_adaptor to indicate currently selected
adaptor:
root@freebsd04:~ # sysctl kern.random.active_adaptor
kern.random.active_adaptor: yarrow

Submitted by:	Arthur Mesh <arthurmesh@gmail.com>

1 files changed, 0 insertions, 62 deletions

diff --git a/sys/dev/random/probe.c b/sys/dev/random/probe.c
deleted file mode 100644
index 7039b92..0000000
--- a/sys/dev/random/probe.c
+++ /dev/null
@@ -1,62 +0,0 @@
-/*-
- * Copyright (c) 2004 Mark R V Murray
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer
- *    in this position and unchanged.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- */
-
-#include <sys/cdefs.h>
-__FBSDID("$FreeBSD$");
-
-#if defined(__amd64__) || defined(__i386__)
-#include "opt_cpu.h"
-#endif
-
-#include <sys/param.h>
-#include <sys/systm.h>
-#include <sys/kernel.h>
-#include <sys/selinfo.h>
-
-#include <dev/random/random_adaptors.h>
-#include <dev/random/randomdev.h>
-
-void
-random_ident_hardware(struct random_adaptor **adaptor)
-{
-	struct random_adaptor *tmp;
-	int enable;
-
-	/* Set default to software (yarrow) */
-	*adaptor = random_adaptor_get("yarrow");
-
-	/* Then go looking for hardware */
-	enable = 1;
-	TUNABLE_INT_FETCH("hw.nehemiah_rng_enable", &enable);
-	if (enable && (tmp = random_adaptor_get("nehemiah")))
-		*adaptor = tmp;
-
-	enable = 1;
-	TUNABLE_INT_FETCH("hw.ivy_rng_enable", &enable);
-	if (enable && (tmp = random_adaptor_get("rdrand")))
-		*adaptor = tmp;
-}