[Midnightbsd-cvs] src [6602] trunk/sys/dev/random/probe.c: add tunable to disable hardware random number generator and default to 0 (no hardware random)

[laffer1 at midnightbsd.org]

Revision: 6602
          http://svnweb.midnightbsd.org/src/?rev=6602
Author:   laffer1
Date:     2014-01-15 20:45:51 -0500 (Wed, 15 Jan 2014)
Log Message:
-----------
add tunable to disable hardware random number generator and default to 0 (no hardware random)

Modified Paths:
--------------
    trunk/sys/dev/random/probe.c

Modified: trunk/sys/dev/random/probe.c
===================================================================
--- trunk/sys/dev/random/probe.c	2014-01-15 00:57:52 UTC (rev 6601)
+++ trunk/sys/dev/random/probe.c	2014-01-16 01:45:51 UTC (rev 6602)
@@ -30,6 +30,8 @@
 
 #include <sys/types.h>
 #include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
 #include <sys/malloc.h>
 #include <sys/random.h>
 #include <sys/selinfo.h>
@@ -57,7 +59,12 @@
 	/* Then go looking for hardware */
 #if defined(__amd64__) || (defined(__i386__) && !defined(PC98))
 	if (via_feature_rng & VIA_HAS_RNG) {
-		*systat = random_nehemiah;
+		int enable;
+
+		enable = 0;
+		TUNABLE_INT_FETCH("hw.nehemiah_rng_enable", &enable);
+		if (enable)
+			*systat = random_nehemiah;
 	}
 #endif
 }