2 files changed, 20 insertions, 1 deletions

diff --git a/sys/dev/randomdev/randomdev.c b/sys/dev/randomdev/randomdev.c
index ff5e481d6689c..c84f4bd670305 100644
--- a/sys/dev/randomdev/randomdev.c
+++ b/sys/dev/randomdev/randomdev.c
@@ -117,7 +117,7 @@ random_write(dev_t dev, struct uio *uio, int flag)
 		error = uiomove(random_buf, c, uio);
 		if (error)
 			break;
-		/* write_random(random_buf, c); */
+		write_random(random_buf, c);
 	}
 	free(random_buf, M_TEMP);
 	return error;
diff --git a/sys/dev/randomdev/yarrow.c b/sys/dev/randomdev/yarrow.c
index c6ae4481a0ebd..e5174d9cc9b5d 100644
--- a/sys/dev/randomdev/yarrow.c
+++ b/sys/dev/randomdev/yarrow.c
@@ -274,6 +274,25 @@ read_random(char *buf, u_int count)
 	return retval;
 }
 
+void
+write_random(char *buf, u_int count)
+{
+	u_int i;
+	intrmask_t mask;
+	struct timespec nanotime;
+
+	/* The reseed task must not be jumped on */
+	mask = splsofttq();
+	for (i = 0; i < count/sizeof(u_int64_t); i++) {
+		getnanotime(&nanotime);
+		random_harvest_internal(&nanotime,
+			*(u_int64_t *)&buf[i*sizeof(u_int64_t)],
+			0, 0, RANDOM_WRITE);
+	}
+	reseed(FAST);
+	splx(mask);
+}
+
 static void
 generator_gate(void)
 {