149 static void jent_apt_reset(struct rand_data *ec, unsigned int delta_masked)  in jent_apt_reset()  argument
152 	ec->apt_count = 0;  in jent_apt_reset()
153 	ec->apt_base = delta_masked;  in jent_apt_reset()
154 	ec->apt_observations = 0;  in jent_apt_reset()
163 static void jent_apt_insert(struct rand_data *ec, unsigned int delta_masked)  in jent_apt_insert()  argument
166 	if (!ec->apt_base_set) {  in jent_apt_insert()
167 		ec->apt_base = delta_masked;  in jent_apt_insert()
168 		ec->apt_base_set = 1;  in jent_apt_insert()
172 	if (delta_masked == ec->apt_base) {  in jent_apt_insert()
173 		ec->apt_count++;  in jent_apt_insert()
175 		if (ec->apt_count >= JENT_APT_CUTOFF)  in jent_apt_insert()
176 			ec->health_failure = 1;  in jent_apt_insert()
179 	ec->apt_observations++;  in jent_apt_insert()
181 	if (ec->apt_observations >= JENT_APT_WINDOW_SIZE)  in jent_apt_insert()
182 		jent_apt_reset(ec, delta_masked);  in jent_apt_insert()
207 static void jent_rct_insert(struct rand_data *ec, int stuck)  in jent_rct_insert()  argument
213 	if (ec->rct_count < 0)  in jent_rct_insert()
217 		ec->rct_count++;  in jent_rct_insert()
233 		if ((unsigned int)ec->rct_count >= (31 * ec->osr)) {  in jent_rct_insert()
234 			ec->rct_count = -1;  in jent_rct_insert()
235 			ec->health_failure = 1;  in jent_rct_insert()
238 		ec->rct_count = 0;  in jent_rct_insert()
251 static int jent_rct_failure(struct rand_data *ec)  in jent_rct_failure()  argument
253 	if (ec->rct_count < 0)  in jent_rct_failure()
280 static int jent_stuck(struct rand_data *ec, __u64 current_delta)  in jent_stuck()  argument
282 	__u64 delta2 = jent_delta(ec->last_delta, current_delta);  in jent_stuck()
283 	__u64 delta3 = jent_delta(ec->last_delta2, delta2);  in jent_stuck()
285 	ec->last_delta = current_delta;  in jent_stuck()
286 	ec->last_delta2 = delta2;  in jent_stuck()
292 	jent_apt_insert(ec, current_delta);  in jent_stuck()
296 		jent_rct_insert(ec, 1);  in jent_stuck()
301 	jent_rct_insert(ec, 0);  in jent_stuck()
315 static int jent_health_failure(struct rand_data *ec)  in jent_health_failure()  argument
321 	return ec->health_failure;  in jent_health_failure()
340 static __u64 jent_loop_shuffle(struct rand_data *ec,  in jent_loop_shuffle()  argument
353 	if (ec)  in jent_loop_shuffle()
354 		time ^= ec->data;  in jent_loop_shuffle()
396 static void jent_lfsr_time(struct rand_data *ec, __u64 time, __u64 loop_cnt,  in jent_lfsr_time()  argument
405 		jent_loop_shuffle(ec, MAX_FOLD_LOOP_BIT, MIN_FOLD_LOOP_BIT);  in jent_lfsr_time()
414 		new = ec->data;  in jent_lfsr_time()
450 		ec->data = new;  in jent_lfsr_time()
477 static void jent_memaccess(struct rand_data *ec, __u64 loop_cnt)  in jent_memaccess()  argument
484 		jent_loop_shuffle(ec, MAX_ACC_LOOP_BIT, MIN_ACC_LOOP_BIT);  in jent_memaccess()
486 	if (NULL == ec || NULL == ec->mem)  in jent_memaccess()
488 	wrap = ec->memblocksize * ec->memblocks;  in jent_memaccess()
497 	for (i = 0; i < (ec->memaccessloops + acc_loop_cnt); i++) {  in jent_memaccess()
498 		unsigned char *tmpval = ec->mem + ec->memlocation;  in jent_memaccess()
510 		ec->memlocation = ec->memlocation + ec->memblocksize - 1;  in jent_memaccess()
511 		ec->memlocation = ec->memlocation % wrap;  in jent_memaccess()
531 static int jent_measure_jitter(struct rand_data *ec)  in jent_measure_jitter()  argument
538 	jent_memaccess(ec, 0);  in jent_measure_jitter()
545 	current_delta = jent_delta(ec->prev_time, time);  in jent_measure_jitter()
546 	ec->prev_time = time;  in jent_measure_jitter()
549 	stuck = jent_stuck(ec, current_delta);  in jent_measure_jitter()
552 	jent_lfsr_time(ec, current_delta, 0, stuck);  in jent_measure_jitter()
563 static void jent_gen_entropy(struct rand_data *ec)  in jent_gen_entropy()  argument
571 	jent_measure_jitter(ec);  in jent_gen_entropy()
575 		if (jent_measure_jitter(ec))  in jent_gen_entropy()
582 		if (++k >= ((DATA_SIZE_BITS + safety_factor) * ec->osr))  in jent_gen_entropy()
610 int jent_read_entropy(struct rand_data *ec, unsigned char *data,  in jent_read_entropy()  argument
615 	if (!ec)  in jent_read_entropy()
621 		jent_gen_entropy(ec);  in jent_read_entropy()
623 		if (jent_health_failure(ec)) {  in jent_read_entropy()
626 			if (jent_rct_failure(ec))  in jent_read_entropy()
642 			jent_apt_reset(ec, 0);  in jent_read_entropy()
643 			ec->apt_base_set = 0;  in jent_read_entropy()
646 			ec->rct_count = 0;  in jent_read_entropy()
649 			ec->health_failure = 0;  in jent_read_entropy()
662 		jent_memcpy(p, &ec->data, tocopy);  in jent_read_entropy()
725 	struct rand_data ec = { 0 };  in jent_entropy_init()  local
728 	ec.osr = 1;  in jent_entropy_init()
765 		ec.prev_time = time;  in jent_entropy_init()
766 		jent_lfsr_time(&ec, time, 0, 0);  in jent_entropy_init()
781 		stuck = jent_stuck(&ec, delta);  in jent_entropy_init()
807 				jent_apt_reset(&ec,  in jent_entropy_init()
809 				if (jent_health_failure(&ec))  in jent_entropy_init()
815 		if (jent_rct_failure(&ec))  in jent_entropy_init()