Re: /dev/random lacks entropy on sparc64

["David S. Miller" <davem@redhat.com>]

On Mon, 09 Aug 2004 23:59:20 +0100
Richard Mortimer <richm@oldelvet.org.uk> wrote:

> I suspect that the patch needs some more work (probably shouldn't use
> assembly directly in drivers/char/random.c). I'm not sure whether we
> should really be calling something like tick_ops->get_tick().

I think we should.  Also, you forgot to shift down the
high bits before xor'ing it into 'num'.

I would use this patch.

=== drivers/char/random.c 1.19 vs edited ==--- 1.19/drivers/char/random.c	2003-12-12 07:18:03 -08:00
+++ edited/drivers/char/random.c	2004-08-09 16:04:44 -07:00
@@ -750,6 +750,11 @@
 	__u32 high;
 	rdtsc(time, high);
 	num ^= high;
+#elif defined (__sparc_v9__)
+	unsigned long tick = tick_ops->get_tick();
+
+	time = (unsigned int) tick;
+	num ^= (tick >> 32UL);
 #else
 	time = jiffies;
 #endif