Decouple yarrow from random(4) device.

* Make Yarrow an optional kernel component -- enabled by "YARROW_RNG" option.
  The files sha2.c, hash.c, randomdev_soft.c and yarrow.c comprise yarrow.

* random(4) device doesn't really depend on rijndael-*.  Yarrow, however, does.

* Add random_adaptors.[ch] which is basically a store of random_adaptor's.
  random_adaptor is basically an adapter that plugs in to random(4).
  random_adaptor can only be plugged in to random(4) very early in bootup.
  Unplugging random_adaptor from random(4) is not supported, and is probably a
  bad idea anyway, due to potential loss of entropy pools.
  We currently have 3 random_adaptors:
  + yarrow
  + rdrand (ivy.c)
  + nehemeiah

* Remove platform dependent logic from probe.c, and move it into
  corresponding registration routines of each random_adaptor provider.
  probe.c doesn't do anything other than picking a specific random_adaptor
  from a list of registered ones.

* If the kernel doesn't have any random_adaptor adapters present then the
  creation of /dev/random is postponed until next random_adaptor is kldload'ed.

* Fix randomdev_soft.c to refer to its own random_adaptor, instead of a
  system wide one.

Submitted by: arthurmesh@gmail.com, obrien
Obtained from: Juniper Networks
Reviewed by: obrien

1 files changed, 1 insertions, 1 deletions

diff --git a/sys/arm/conf/HL201 b/sys/arm/conf/HL201
index 1294f1a..a2eee41 100644
--- a/sys/arm/conf/HL201
+++ b/sys/arm/conf/HL201
@@ -67,6 +67,7 @@ options 	RWLOCK_NOINLINE
 options 	NO_FFS_SNAPSHOT
 options 	NO_SWAPPING
 device		random
+options 	YARROW_RNG		# Yarrow software RNG
 device		loop
 device		ether
 device		uart
@@ -129,4 +130,3 @@ device		pass		# Passthrough device (direct SCSI access)
 #device		wlan_tkip	# 802.11 TKIP support
 #device		wlan_amrr	# AMRR transmit rate control algorithm
 options 	ROOTDEVNAME=\"ufs:da0s1a\"
-