[src/trunk]: src/sys/arch/x86/x86 Add #ifdef, for i386 not to panic.

[maxv <maxv%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/c50925da0705
branches:  trunk
changeset: 831455:c50925da0705
user:      maxv <maxv%NetBSD.org@localhost>
date:      Sat Mar 31 07:15:47 2018 +0000

description:
Add #ifdef, for i386 not to panic.

diffstat:

 sys/arch/x86/x86/spectre.c |  9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diffs (31 lines):

diff -r f9f18c86d84f -r c50925da0705 sys/arch/x86/x86/spectre.c
--- a/sys/arch/x86/x86/spectre.c        Sat Mar 31 06:34:51 2018 +0000
+++ b/sys/arch/x86/x86/spectre.c        Sat Mar 31 07:15:47 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: spectre.c,v 1.5 2018/03/29 07:21:24 maxv Exp $ */
+/*     $NetBSD: spectre.c,v 1.6 2018/03/31 07:15:47 maxv Exp $ */
 
 /*
  * Copyright (c) 2018 NetBSD Foundation, Inc.
@@ -34,7 +34,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: spectre.c,v 1.5 2018/03/29 07:21:24 maxv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: spectre.c,v 1.6 2018/03/31 07:15:47 maxv Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -94,7 +94,12 @@
                        x86_cpuid(7, descs);
                        if (descs[3] & CPUID_SEF_IBRS) {
                                /* descs[3] = %edx */
+#ifdef __x86_64__
                                mitigation_method = MITIGATION_INTEL_IBRS;
+#else
+                               /* IBRS not supported on i386. */
+                               mitigation_method = MITIGATION_NONE;
+#endif
                                return;
                        }
                }