From 30ec5015b12bd772c68105481875014b3e92fd1e Mon Sep 17 00:00:00 2001
From: thorpej <thorpej@NetBSD.org>
Date: Tue, 29 Sep 1998 07:01:16 +0000
Subject: [PATCH] In exception_return(), if MULTIPROCESSOR, skip software
 interrupts, ASTs, and floating point handling if we're not the primary CPU.

---
 sys/arch/alpha/alpha/locore.s | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/sys/arch/alpha/alpha/locore.s b/sys/arch/alpha/alpha/locore.s
index ddb7ccbdbd6e..d369ccba47ad 100644
--- a/sys/arch/alpha/alpha/locore.s
+++ b/sys/arch/alpha/alpha/locore.s
@@ -1,4 +1,4 @@
-/* $NetBSD: locore.s,v 1.51 1998/09/24 23:28:18 thorpej Exp $ */
+/* $NetBSD: locore.s,v 1.52 1998/09/29 07:01:16 thorpej Exp $ */
 
 /*
  * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
@@ -34,7 +34,7 @@
 
 #include <machine/asm.h>
 
-__KERNEL_RCSID(0, "$NetBSD: locore.s,v 1.51 1998/09/24 23:28:18 thorpej Exp $");
+__KERNEL_RCSID(0, "$NetBSD: locore.s,v 1.52 1998/09/29 07:01:16 thorpej Exp $");
 
 #ifndef EVCNT_COUNTERS
 #include <machine/intrcnt.h>
@@ -246,6 +246,20 @@ LEAF(exception_return, 1)			/* XXX should be NESTED */
 	br	pv, Ler1
 Ler1:	LDGP(pv)
 
+#if defined(MULTIPROCESSOR)
+	/* XXX XXX XXX */
+	/*
+	 * Check the current processor ID.  If we're not the primary
+	 * CPU, then just restore registers and bail out.
+	 */
+	call_pal PAL_OSF1_whami
+	lda	t0, hwrpb
+	ldq	t0, 0(t0)
+	ldq	t1, RPB_PRIMARY_CPU_ID(t0)
+	cmpeq	t1, v0, t0
+	beq	t0, Lrestoreregs		/* == 0: bail out now */
+#endif
+
 	ldq	s1, (FRAME_PS * 8)(sp)		/* get the saved PS */
 	and	s1, ALPHA_PSL_IPL_MASK, t0	/* look at the saved IPL */
 	bne	t0, Lrestoreregs		/* != 0: can't do AST or SIR */