Overhaul the entropy device:

o Each source gets its own queue, which is a FIFO, not a ring buffer.
  The FIFOs are implemented with the sys/queue.h macros. The separation
  is so that a low entropy/high rate source can't swamp the harvester
  with low-grade entropy and destroy the reseeds.

o Each FIFO is limited to 256 (set as a macro, so adjustable) events
  queueable. Full FIFOs are ignored by the harvester. This is to
  prevent memory wastage, and helps to keep the kernel thread CPU
  usage within reasonable limits.

o There is no need to break up the event harvesting into ${burst}
  sized chunks, so retire that feature.

o Break the device away from its roots with the memory device, and
  allow it to get its major number automagically.

1 files changed, 4 insertions, 1 deletions

diff --git a/sys/dev/random/randomdev.h b/sys/dev/random/randomdev.h
index 359dc26..aa23fc8 100644
--- a/sys/dev/random/randomdev.h
+++ b/sys/dev/random/randomdev.h
@@ -46,14 +46,17 @@
 
 SYSCTL_DECL(_kern_random);
 
+MALLOC_DECLARE(M_ENTROPY);
+
 /* These are used to queue harvested packets of entropy. The entropy
  * buffer size is pretty arbitrary.
  */
 struct harvest {
-	u_int64_t somecounter;		/* fast counter for clock jitter */
+	uintmax_t somecounter;		/* fast counter for clock jitter */
 	u_char entropy[HARVESTSIZE];	/* the harvested entropy */
 	u_int size, bits, frac;		/* stats about the entropy */
 	enum esource source;		/* stats about the entropy */
+	STAILQ_ENTRY(harvest) next;	/* next item on the list */
 };
 
 void random_init(void);