--- zzzz-none-000/linux-4.4.60/drivers/char/random.c	2017-04-08 07:53:53.000000000 +0000
+++ scorpion-7490-727/linux-4.4.60/drivers/char/random.c	2021-02-04 17:41:59.000000000 +0000
@@ -139,6 +139,9 @@
  * that might otherwise be identical and have very little entropy
  * available to them (particularly common in the embedded world).
  *
+ *      void random_input_words(__u32 *buf, size_t wordcount, int ent_count)
+ *      int random_input_wait(void);
+ *
  * add_input_randomness() uses the input layer interrupt timing, as well as
  * the event type information from the hardware.
  *
@@ -152,6 +155,13 @@
  * seek times do not make for good sources of entropy, as their seek
  * times are usually fairly consistent.
  *
+ * random_input_words() just provides a raw block of entropy to the input
+ * pool, such as from a hardware entropy generator.
+ *
+ * random_input_wait() suspends the caller until such time as the
+ * entropy pool falls below the write threshold, and returns a count of how
+ * much entropy (in bits) is needed to sustain the pool.
+ *
  * All of these routines try to estimate how many bits of randomness a
  * particular randomness source.  They do this by keeping track of the
  * first and second order deltas of the event timings.
@@ -962,6 +972,61 @@
 EXPORT_SYMBOL_GPL(add_disk_randomness);
 #endif
 
+/*
+ * random_input_words - add bulk entropy to pool
+ *
+ * @buf: buffer to add
+ * @wordcount: number of __u32 words to add
+ * @ent_count: total amount of entropy (in bits) to credit
+ *
+ * this provides bulk input of entropy to the input pool
+ *
+ */
+void random_input_words(__u32 *buf, size_t wordcount, int ent_count)
+{
+	mix_pool_bytes(&input_pool, buf, wordcount*4);
+
+	credit_entropy_bits(&input_pool, ent_count);
+
+	/*
+	 * Wake up waiting processes if we have enough
+	 * entropy.
+	 */
+	if (input_pool.entropy_count >= random_read_wakeup_bits)
+		wake_up_interruptible(&random_read_wait);
+}
+EXPORT_SYMBOL(random_input_words);
+
+/*
+ * random_input_wait - wait until random needs entropy
+ *
+ * this function sleeps until the /dev/random subsystem actually
+ * needs more entropy, and then return the amount of entropy
+ * that it would be nice to have added to the system.
+ */
+int random_input_wait(void)
+{
+	int count;
+
+	wait_event_interruptible(random_write_wait, 
+			 input_pool.entropy_count < random_write_wakeup_bits);
+
+	count = random_write_wakeup_bits - input_pool.entropy_count;
+
+        /* likely we got woken up due to a signal */
+	if (count <= 0) count = random_read_wakeup_bits; 
+
+	pr_debug("requesting %d bits from input_wait()er %d<%d\n",
+		  count,
+		  input_pool.entropy_count, random_write_wakeup_bits);
+
+	return count;
+}
+EXPORT_SYMBOL(random_input_wait);
+
+
+#define EXTRACT_SIZE 10
+
 /*********************************************************************
  *
  * Entropy extraction routines
@@ -1467,7 +1532,7 @@
 	if (unlikely(nonblocking_pool.initialized == 0) &&
 	    maxwarn > 0) {
 		maxwarn--;
-		printk(KERN_NOTICE "random: %s: uninitialized urandom read "
+		pr_debug(KERN_NOTICE "random: %s: uninitialized urandom read "
 		       "(%zd bytes read, %d bits of entropy available)\n",
 		       current->comm, nbytes, nonblocking_pool.entropy_total);
 	}