From 7e9aef235a685d309e9287d47513511a09fd7da8 Mon Sep 17 00:00:00 2001
From: Marius Strobl <marius@FreeBSD.org>
Date: Sun, 2 May 2010 12:08:15 +0000
Subject: [PATCH] Add a hack for SPARC64 V CPUs, which set some undocumented
 bits in the first data word.

---
 sys/sparc64/sparc64/interrupt.S | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/sys/sparc64/sparc64/interrupt.S b/sys/sparc64/sparc64/interrupt.S
index 75a97275301..b71a05da98d 100644
--- a/sys/sparc64/sparc64/interrupt.S
+++ b/sys/sparc64/sparc64/interrupt.S
@@ -83,8 +83,11 @@ ENTRY(intr_vector)
 	 * The 2nd word points to code to execute and the 3rd is an argument
 	 * to pass.  Jump to it.
 	 */
-	brnz,a,pt %g3, 1f
-	 nop
+	brnz,pt %g3, 1f
+	/*
+	 * NB: Zeus CPUs set some undocumented bits in the first data word.
+	 */
+	 and	%g3, IV_MAX - 1, %g3
 	jmpl	%g4, %g0
 	 nop
 	/* NOTREACHED */