147  * @ec [in] Reference to entropy collector
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()
160  * @ec [in] Reference to entropy collector
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()
204  * @ec [in] Reference to entropy collector
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()
228 		 * Note, ec->rct_count (which equals to value B in the pseudo  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()
245  * @ec [in] Reference to entropy collector
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()
273  * @ec [in] Reference to entropy collector
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()
309  * @ec [in] Reference to entropy collector
315 static int jent_health_failure(struct rand_data *ec)  in jent_health_failure()  argument
317 	return ec->health_failure;  in jent_health_failure()
329  * @ec entropy collector struct -- may be NULL
336 static __u64 jent_loop_shuffle(struct rand_data *ec,  in jent_loop_shuffle()  argument
349 	if (ec)  in jent_loop_shuffle()
350 		time ^= ec->data;  in jent_loop_shuffle()
381  * @ec [in] entropy collector struct
388  * updated ec->data
392 static void jent_lfsr_time(struct rand_data *ec, __u64 time, __u64 loop_cnt,  in jent_lfsr_time()  argument
401 		jent_loop_shuffle(ec, MAX_FOLD_LOOP_BIT, MIN_FOLD_LOOP_BIT);  in jent_lfsr_time()
410 		new = ec->data;  in jent_lfsr_time()
446 		ec->data = new;  in jent_lfsr_time()
464  * to reliably access either L3 or memory, the ec->mem memory must be quite
467  * @ec [in] Reference to the entropy collector with the memory access data -- if
473 static void jent_memaccess(struct rand_data *ec, __u64 loop_cnt)  in jent_memaccess()  argument
480 		jent_loop_shuffle(ec, MAX_ACC_LOOP_BIT, MIN_ACC_LOOP_BIT);  in jent_memaccess()
482 	if (NULL == ec || NULL == ec->mem)  in jent_memaccess()
484 	wrap = ec->memblocksize * ec->memblocks;  in jent_memaccess()
493 	for (i = 0; i < (ec->memaccessloops + acc_loop_cnt); i++) {  in jent_memaccess()
494 		unsigned char *tmpval = ec->mem + ec->memlocation;  in jent_memaccess()
506 		ec->memlocation = ec->memlocation + ec->memblocksize - 1;  in jent_memaccess()
507 		ec->memlocation = ec->memlocation % wrap;  in jent_memaccess()
523  * @ec [in] Reference to entropy collector
527 static int jent_measure_jitter(struct rand_data *ec)  in jent_measure_jitter()  argument
534 	jent_memaccess(ec, 0);  in jent_measure_jitter()
541 	current_delta = jent_delta(ec->prev_time, time);  in jent_measure_jitter()
542 	ec->prev_time = time;  in jent_measure_jitter()
545 	stuck = jent_stuck(ec, current_delta);  in jent_measure_jitter()
548 	jent_lfsr_time(ec, current_delta, 0, stuck);  in jent_measure_jitter()
557  * @ec [in] Reference to entropy collector
559 static void jent_gen_entropy(struct rand_data *ec)  in jent_gen_entropy()  argument
567 	jent_measure_jitter(ec);  in jent_gen_entropy()
569 	while (!jent_health_failure(ec)) {  in jent_gen_entropy()
571 		if (jent_measure_jitter(ec))  in jent_gen_entropy()
578 		if (++k >= ((DATA_SIZE_BITS + safety_factor) * ec->osr))  in jent_gen_entropy()
593  * @ec [in] Reference to entropy collector
606 int jent_read_entropy(struct rand_data *ec, unsigned char *data,  in jent_read_entropy()  argument
611 	if (!ec)  in jent_read_entropy()
617 		jent_gen_entropy(ec);  in jent_read_entropy()
619 		if (jent_health_failure(ec)) {  in jent_read_entropy()
622 			if (jent_rct_failure(ec))  in jent_read_entropy()
638 			jent_apt_reset(ec, 0);  in jent_read_entropy()
639 			ec->apt_base_set = 0;  in jent_read_entropy()
642 			ec->rct_count = 0;  in jent_read_entropy()
645 			ec->health_failure = 0;  in jent_read_entropy()
658 		jent_memcpy(p, &ec->data, tocopy);  in jent_read_entropy()
721 	struct rand_data ec = { 0 };  in jent_entropy_init()  local
724 	ec.osr = 1;  in jent_entropy_init()
761 		ec.prev_time = time;  in jent_entropy_init()
762 		jent_lfsr_time(&ec, time, 0, 0);  in jent_entropy_init()
777 		stuck = jent_stuck(&ec, delta);  in jent_entropy_init()
803 				jent_apt_reset(&ec,  in jent_entropy_init()
805 				if (jent_health_failure(&ec))  in jent_entropy_init()
811 		if (jent_rct_failure(&ec))  in jent_entropy_init()