Provide keyboard entropy harvesting for PCVT users.

sys/i386/isa/pcvt/pcvt_hdr.h

@@ -59,6 +59,7 @@
 #include <sys/uio.h>
 #include <sys/callout.h>
 #include <sys/kernel.h>
+#include <sys/random.h>
 #include <sys/syslog.h>
 #include <sys/malloc.h>
 #include <sys/time.h>

sys/i386/isa/pcvt/pcvt_kbd.c

@@ -751,6 +751,8 @@ sgetc(int noblock)
 	{
 		keybuf[0] = dt;
 
+		random_harvest(keybuf, sizeof(keybuf), 1, 0, RANDOM_KEYBOARD);
+
 		return ((u_char *)keybuf);
 	}
 
@@ -825,6 +827,8 @@ sgetc(int noblock)
 	/* got a normal scan key */
 regular:
 
+	random_harvest(&dt, sizeof(dt), 1, 0, RANDOM_KEYBOARD);
+
 #if PCVT_SCANSET == 1
 	kbd_status.breakseen = dt & 0x80 ? 1 : 0;
 	dt &= 0x7f;