Differential D32725 Diff 97653 sys/dev/random/random_harvestq.c

Changeset View

Standalone View

sys/dev/random/random_harvestq.c

	Show First 20 Lines • Show All 517 Lines • ▼ Show 20 Lines
	*/			*/
	void			void
	random_harvest_queue_(const void *entropy, u_int size, enum random_entropy_source origin)			random_harvest_queue_(const void *entropy, u_int size, enum random_entropy_source origin)
	{			{
	struct harvest_event *event;			struct harvest_event *event;
	u_int ring_in;			u_int ring_in;

	KASSERT(origin >= RANDOM_START && origin < ENTROPYSOURCE, ("%s: origin %d invalid\n", __func__, origin));			KASSERT(origin >= RANDOM_START && origin < ENTROPYSOURCE, ("%s: origin %d invalid\n", __func__, origin));

				/* Do a very dirty check to avoid taking lock if not necessary */
				if (((harvest_context.hc_entropy_ring.in + 1) % RANDOM_RING_MAX)
				== harvest_context.hc_entropy_ring.out)
				return;

	RANDOM_HARVEST_LOCK();			RANDOM_HARVEST_LOCK();
	ring_in = (harvest_context.hc_entropy_ring.in + 1)%RANDOM_RING_MAX;			ring_in = (harvest_context.hc_entropy_ring.in + 1)%RANDOM_RING_MAX;
	if (ring_in != harvest_context.hc_entropy_ring.out) {			if (ring_in != harvest_context.hc_entropy_ring.out) {
	/* The ring is not full */			/* The ring is not full */
	event = harvest_context.hc_entropy_ring.ring + ring_in;			event = harvest_context.hc_entropy_ring.ring + ring_in;
	event->he_somecounter = (uint32_t)get_cyclecount();			event->he_somecounter = (uint32_t)get_cyclecount();
	event->he_source = origin;			event->he_source = origin;
	event->he_destination = harvest_context.hc_destination[origin]++;			event->he_destination = harvest_context.hc_destination[origin]++;
	▲ Show 20 Lines • Show All 136 Lines • Show Last 20 Lines