Module Name: src
Committed By: christos
Date: Mon Jan 12 16:34:39 UTC 2015
Modified Files:
src/sys/arch/x86/x86: cpu.c
Log Message:
PR/49104: Jarle Greipsland: Don't touch cr4 in cpus that don't have it.
XXX: pullup-7
To generate a diff of this commit:
cvs rdiff -u -r1.112 -r1.113 src/sys/arch/x86/x86/cpu.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/arch/x86/x86/cpu.c
diff -u src/sys/arch/x86/x86/cpu.c:1.112 src/sys/arch/x86/x86/cpu.c:1.113
--- src/sys/arch/x86/x86/cpu.c:1.112 Mon Dec 8 10:22:47 2014
+++ src/sys/arch/x86/x86/cpu.c Mon Jan 12 11:34:39 2015
@@ -1,4 +1,4 @@
-/* $NetBSD: cpu.c,v 1.112 2014/12/08 15:22:47 msaitoh Exp $ */
+/* $NetBSD: cpu.c,v 1.113 2015/01/12 16:34:39 christos Exp $ */
/*-
* Copyright (c) 2000-2012 NetBSD Foundation, Inc.
@@ -62,7 +62,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: cpu.c,v 1.112 2014/12/08 15:22:47 msaitoh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: cpu.c,v 1.113 2015/01/12 16:34:39 christos Exp $");
#include "opt_ddb.h"
#include "opt_mpbios.h" /* for MPDEBUG */
@@ -551,11 +551,10 @@ cpu_childdetached(device_t self, device_
void
cpu_init(struct cpu_info *ci)
{
- uint32_t cr4;
+ uint32_t cr4 = 0;
lcr0(rcr0() | CR0_WP);
- cr4 = rcr4();
/*
* On a P6 or above, enable global TLB caching if the
* hardware supports it.
@@ -580,7 +579,10 @@ cpu_init(struct cpu_info *ci)
if (cpu_feature[1] & CPUID2_XSAVE)
cr4 |= CR4_OSXSAVE;
- lcr4(cr4);
+ if (cr4) {
+ cr4 |= rcr4();
+ lcr4(cr4);
+ }
/* If xsave is enabled, enable all fpu features */
if (cr4 & CR4_OSXSAVE)
