183 static void jent_apt_init(struct rand_data *ec, unsigned int osr)  in jent_apt_init()  argument
190 		ec->apt_cutoff = jent_apt_cutoff_lookup[  in jent_apt_init()
192 		ec->apt_cutoff_permanent = jent_apt_cutoff_permanent_lookup[  in jent_apt_init()
195 		ec->apt_cutoff = jent_apt_cutoff_lookup[osr - 1];  in jent_apt_init()
196 		ec->apt_cutoff_permanent =  in jent_apt_init()
203  * @ec [in] Reference to entropy collector
205 static void jent_apt_reset(struct rand_data *ec, unsigned int delta_masked)  in jent_apt_reset()  argument
208 	ec->apt_count = 0;  in jent_apt_reset()
209 	ec->apt_base = delta_masked;  in jent_apt_reset()
210 	ec->apt_observations = 0;  in jent_apt_reset()
216  * @ec [in] Reference to entropy collector
219 static void jent_apt_insert(struct rand_data *ec, unsigned int delta_masked)  in jent_apt_insert()  argument
222 	if (!ec->apt_base_set) {  in jent_apt_insert()
223 		ec->apt_base = delta_masked;  in jent_apt_insert()
224 		ec->apt_base_set = 1;  in jent_apt_insert()
228 	if (delta_masked == ec->apt_base) {  in jent_apt_insert()
229 		ec->apt_count++;  in jent_apt_insert()
231 		/* Note, ec->apt_count starts with one. */  in jent_apt_insert()
232 		if (ec->apt_count >= ec->apt_cutoff_permanent)  in jent_apt_insert()
233 			ec->health_failure |= JENT_APT_FAILURE_PERMANENT;  in jent_apt_insert()
234 		else if (ec->apt_count >= ec->apt_cutoff)  in jent_apt_insert()
235 			ec->health_failure |= JENT_APT_FAILURE;  in jent_apt_insert()
238 	ec->apt_observations++;  in jent_apt_insert()
240 	if (ec->apt_observations >= JENT_APT_WINDOW_SIZE)  in jent_apt_insert()
241 		jent_apt_reset(ec, delta_masked);  in jent_apt_insert()
263  * @ec [in] Reference to entropy collector
266 static void jent_rct_insert(struct rand_data *ec, int stuck)  in jent_rct_insert()  argument
269 		ec->rct_count++;  in jent_rct_insert()
281 		 * Note, ec->rct_count (which equals to value B in the pseudo  in jent_rct_insert()
287 		if ((unsigned int)ec->rct_count >= (60 * ec->osr)) {  in jent_rct_insert()
288 			ec->rct_count = -1;  in jent_rct_insert()
289 			ec->health_failure |= JENT_RCT_FAILURE_PERMANENT;  in jent_rct_insert()
290 		} else if ((unsigned int)ec->rct_count >= (30 * ec->osr)) {  in jent_rct_insert()
291 			ec->rct_count = -1;  in jent_rct_insert()
292 			ec->health_failure |= JENT_RCT_FAILURE;  in jent_rct_insert()
296 		ec->rct_count = 0;  in jent_rct_insert()
315  * @ec [in] Reference to entropy collector
322 static int jent_stuck(struct rand_data *ec, __u64 current_delta)  in jent_stuck()  argument
324 	__u64 delta2 = jent_delta(ec->last_delta, current_delta);  in jent_stuck()
325 	__u64 delta3 = jent_delta(ec->last_delta2, delta2);  in jent_stuck()
327 	ec->last_delta = current_delta;  in jent_stuck()
328 	ec->last_delta2 = delta2;  in jent_stuck()
334 	jent_apt_insert(ec, current_delta);  in jent_stuck()
338 		jent_rct_insert(ec, 1);  in jent_stuck()
343 	jent_rct_insert(ec, 0);  in jent_stuck()
351  * @ec [in] Reference to entropy collector
360 static unsigned int jent_health_failure(struct rand_data *ec)  in jent_health_failure()  argument
366 	return ec->health_failure;  in jent_health_failure()
416  * ec [in] entropy collector
423 static int jent_condition_data(struct rand_data *ec, __u64 time, int stuck)  in jent_condition_data()  argument
432 		ec->rct_count,  in jent_condition_data()
433 		ec->apt_observations,  in jent_condition_data()
434 		ec->apt_count,  in jent_condition_data()
435 		ec->apt_base  in jent_condition_data()
438 	return jent_hash_time(ec->hash_state, time, (u8 *)&addtl, sizeof(addtl),  in jent_condition_data()
457  * to reliably access either L3 or memory, the ec->mem memory must be quite
460  * @ec [in] Reference to the entropy collector with the memory access data -- if
466 static void jent_memaccess(struct rand_data *ec, __u64 loop_cnt)  in jent_memaccess()  argument
475 	if (NULL == ec || NULL == ec->mem)  in jent_memaccess()
477 	wrap = ec->memblocksize * ec->memblocks;  in jent_memaccess()
486 	for (i = 0; i < (ec->memaccessloops + acc_loop_cnt); i++) {  in jent_memaccess()
487 		unsigned char *tmpval = ec->mem + ec->memlocation;  in jent_memaccess()
499 		ec->memlocation = ec->memlocation + ec->memblocksize - 1;  in jent_memaccess()
500 		ec->memlocation = ec->memlocation % wrap;  in jent_memaccess()
516  * @ec [in] Reference to entropy collector
520 static int jent_measure_jitter(struct rand_data *ec, __u64 *ret_current_delta)  in jent_measure_jitter()  argument
527 	jent_memaccess(ec, 0);  in jent_measure_jitter()
534 	current_delta = jent_delta(ec->prev_time, time);  in jent_measure_jitter()
535 	ec->prev_time = time;  in jent_measure_jitter()
538 	stuck = jent_stuck(ec, current_delta);  in jent_measure_jitter()
541 	if (jent_condition_data(ec, current_delta, stuck))  in jent_measure_jitter()
555  * @ec [in] Reference to entropy collector
557 static void jent_gen_entropy(struct rand_data *ec)  in jent_gen_entropy()  argument
565 	jent_measure_jitter(ec, NULL);  in jent_gen_entropy()
567 	while (!jent_health_failure(ec)) {  in jent_gen_entropy()
569 		if (jent_measure_jitter(ec, NULL))  in jent_gen_entropy()
576 		if (++k >= ((DATA_SIZE_BITS + safety_factor) * ec->osr))  in jent_gen_entropy()
591  * @ec [in] Reference to entropy collector
604 int jent_read_entropy(struct rand_data *ec, unsigned char *data,  in jent_read_entropy()  argument
609 	if (!ec)  in jent_read_entropy()
615 		jent_gen_entropy(ec);  in jent_read_entropy()
617 		health_test_result = jent_health_failure(ec);  in jent_read_entropy()
631 			if (jent_entropy_init(0, 0, NULL, ec)) {  in jent_read_entropy()
633 				ec->health_failure &=  in jent_read_entropy()
643 		if (jent_read_random_block(ec->hash_state, p, tocopy))  in jent_read_entropy()
711 	 * If caller provides an allocated ec, reuse it which implies that the  in jent_entropy_init()
715 	struct rand_data *ec = p_ec;  in jent_entropy_init()  local
719 	if (!ec) {  in jent_entropy_init()
720 		ec = jent_entropy_collector_alloc(osr, flags, hash_state);  in jent_entropy_init()
721 		if (!ec)  in jent_entropy_init()
726 		jent_apt_reset(ec, 0);  in jent_entropy_init()
728 		ec->apt_base_set = 0;  in jent_entropy_init()
730 		ec->rct_count = 0;  in jent_entropy_init()
732 		ec->health_failure &= (~JENT_RCT_FAILURE);  in jent_entropy_init()
733 		ec->health_failure &= (~JENT_APT_FAILURE);  in jent_entropy_init()
766 		jent_measure_jitter(ec, &delta);  in jent_entropy_init()
767 		end_time = ec->prev_time;  in jent_entropy_init()
768 		start_time = ec->prev_time - delta;  in jent_entropy_init()
814 	health_test_result = jent_health_failure(ec);  in jent_entropy_init()
823 		jent_entropy_collector_free(ec);  in jent_entropy_init()