153  * @ec [in] Reference to entropy collector
155 static void jent_apt_reset(struct rand_data *ec, unsigned int delta_masked)  in jent_apt_reset()  argument
158 	ec->apt_count = 0;  in jent_apt_reset()
159 	ec->apt_base = delta_masked;  in jent_apt_reset()
160 	ec->apt_observations = 0;  in jent_apt_reset()
166  * @ec [in] Reference to entropy collector
169 static void jent_apt_insert(struct rand_data *ec, unsigned int delta_masked)  in jent_apt_insert()  argument
172 	if (!ec->apt_base_set) {  in jent_apt_insert()
173 		ec->apt_base = delta_masked;  in jent_apt_insert()
174 		ec->apt_base_set = 1;  in jent_apt_insert()
178 	if (delta_masked == ec->apt_base)  in jent_apt_insert()
179 		ec->apt_count++;  in jent_apt_insert()
181 	ec->apt_observations++;  in jent_apt_insert()
183 	if (ec->apt_observations >= JENT_APT_WINDOW_SIZE)  in jent_apt_insert()
184 		jent_apt_reset(ec, delta_masked);  in jent_apt_insert()
188 static int jent_apt_permanent_failure(struct rand_data *ec)  in jent_apt_permanent_failure()  argument
190 	return (ec->apt_count >= JENT_APT_CUTOFF_PERMANENT) ? 1 : 0;  in jent_apt_permanent_failure()
193 static int jent_apt_failure(struct rand_data *ec)  in jent_apt_failure()  argument
195 	return (ec->apt_count >= JENT_APT_CUTOFF) ? 1 : 0;  in jent_apt_failure()
217  * @ec [in] Reference to entropy collector
220 static void jent_rct_insert(struct rand_data *ec, int stuck)  in jent_rct_insert()  argument
223 		ec->rct_count++;  in jent_rct_insert()
226 		ec->rct_count = 0;  in jent_rct_insert()
245  * @ec [in] Reference to entropy collector
252 static int jent_stuck(struct rand_data *ec, __u64 current_delta)  in jent_stuck()  argument
254 	__u64 delta2 = jent_delta(ec->last_delta, current_delta);  in jent_stuck()
255 	__u64 delta3 = jent_delta(ec->last_delta2, delta2);  in jent_stuck()
257 	ec->last_delta = current_delta;  in jent_stuck()
258 	ec->last_delta2 = delta2;  in jent_stuck()
264 	jent_apt_insert(ec, current_delta);  in jent_stuck()
268 		jent_rct_insert(ec, 1);  in jent_stuck()
273 	jent_rct_insert(ec, 0);  in jent_stuck()
279 static int jent_rct_permanent_failure(struct rand_data *ec)  in jent_rct_permanent_failure()  argument
281 	return (ec->rct_count >= JENT_RCT_CUTOFF_PERMANENT) ? 1 : 0;  in jent_rct_permanent_failure()
284 static int jent_rct_failure(struct rand_data *ec)  in jent_rct_failure()  argument
286 	return (ec->rct_count >= JENT_RCT_CUTOFF) ? 1 : 0;  in jent_rct_failure()
290 static int jent_health_failure(struct rand_data *ec)  in jent_health_failure()  argument
292 	return jent_rct_failure(ec) | jent_apt_failure(ec);  in jent_health_failure()
295 static int jent_permanent_health_failure(struct rand_data *ec)  in jent_permanent_health_failure()  argument
297 	return jent_rct_permanent_failure(ec) | jent_apt_permanent_failure(ec);  in jent_permanent_health_failure()
347  * ec [in] entropy collector
354 static int jent_condition_data(struct rand_data *ec, __u64 time, int stuck)  in jent_condition_data()  argument
363 		ec->rct_count,  in jent_condition_data()
364 		ec->apt_observations,  in jent_condition_data()
365 		ec->apt_count,  in jent_condition_data()
366 		ec->apt_base  in jent_condition_data()
369 	return jent_hash_time(ec->hash_state, time, (u8 *)&addtl, sizeof(addtl),  in jent_condition_data()
388  * to reliably access either L3 or memory, the ec->mem memory must be quite
391  * @ec [in] Reference to the entropy collector with the memory access data -- if
397 static void jent_memaccess(struct rand_data *ec, __u64 loop_cnt)  in jent_memaccess()  argument
406 	if (NULL == ec || NULL == ec->mem)  in jent_memaccess()
408 	wrap = ec->memblocksize * ec->memblocks;  in jent_memaccess()
417 	for (i = 0; i < (ec->memaccessloops + acc_loop_cnt); i++) {  in jent_memaccess()
418 		unsigned char *tmpval = ec->mem + ec->memlocation;  in jent_memaccess()
430 		ec->memlocation = ec->memlocation + ec->memblocksize - 1;  in jent_memaccess()
431 		ec->memlocation = ec->memlocation % wrap;  in jent_memaccess()
447  * @ec [in] Reference to entropy collector
451 static int jent_measure_jitter(struct rand_data *ec)  in jent_measure_jitter()  argument
458 	jent_memaccess(ec, 0);  in jent_measure_jitter()
465 	current_delta = jent_delta(ec->prev_time, time);  in jent_measure_jitter()
466 	ec->prev_time = time;  in jent_measure_jitter()
469 	stuck = jent_stuck(ec, current_delta);  in jent_measure_jitter()
472 	if (jent_condition_data(ec, current_delta, stuck))  in jent_measure_jitter()
482  * @ec [in] Reference to entropy collector
484 static void jent_gen_entropy(struct rand_data *ec)  in jent_gen_entropy()  argument
492 	jent_measure_jitter(ec);  in jent_gen_entropy()
494 	while (!jent_health_failure(ec)) {  in jent_gen_entropy()
496 		if (jent_measure_jitter(ec))  in jent_gen_entropy()
503 		if (++k >= ((DATA_SIZE_BITS + safety_factor) * ec->osr))  in jent_gen_entropy()
518  * @ec [in] Reference to entropy collector
531 int jent_read_entropy(struct rand_data *ec, unsigned char *data,  in jent_read_entropy()  argument
536 	if (!ec)  in jent_read_entropy()
542 		jent_gen_entropy(ec);  in jent_read_entropy()
544 		if (jent_permanent_health_failure(ec)) {  in jent_read_entropy()
552 		} else if (jent_health_failure(ec)) {  in jent_read_entropy()
557 			if (jent_entropy_init(ec->hash_state))  in jent_read_entropy()
567 		if (jent_read_random_block(ec->hash_state, p, tocopy))  in jent_read_entropy()
634 	struct rand_data ec = { 0 };  in jent_entropy_init()  local
637 	ec.osr = 1;  in jent_entropy_init()
638 	ec.hash_state = hash_state;  in jent_entropy_init()
675 		ec.prev_time = time;  in jent_entropy_init()
676 		jent_condition_data(&ec, time, 0);  in jent_entropy_init()
691 		stuck = jent_stuck(&ec, delta);  in jent_entropy_init()
717 				jent_apt_reset(&ec,  in jent_entropy_init()
723 		if (jent_health_failure(&ec))  in jent_entropy_init()