[src/trunk]: src/sys/arch/x86/x86 use tlbflush() instead of writing to %cr3, ...

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

details:   https://anonhg.NetBSD.org/src/rev/ddfce08c0418
branches:  trunk
changeset: 320890:ddfce08c0418
user:      jdolecek <jdolecek%NetBSD.org@localhost>
date:      Sun Mar 04 10:02:10 2018 +0000

description:
use tlbflush() instead of writing to %cr3, so it's more clear what code does

diffstat:

 sys/arch/x86/x86/mtrr_i686.c |  11 +++++------
 1 files changed, 5 insertions(+), 6 deletions(-)

diffs (46 lines):

diff -r d60656c4aafe -r ddfce08c0418 sys/arch/x86/x86/mtrr_i686.c
--- a/sys/arch/x86/x86/mtrr_i686.c      Sun Mar 04 08:04:59 2018 +0000
+++ b/sys/arch/x86/x86/mtrr_i686.c      Sun Mar 04 10:02:10 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: mtrr_i686.c,v 1.29 2017/06/01 02:45:08 chs Exp $ */
+/*     $NetBSD: mtrr_i686.c,v 1.30 2018/03/04 10:02:10 jdolecek Exp $ */
 
 /*-
  * Copyright (c) 2000, 2011 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: mtrr_i686.c,v 1.29 2017/06/01 02:45:08 chs Exp $");
+__KERNEL_RCSID(0, "$NetBSD: mtrr_i686.c,v 1.30 2018/03/04 10:02:10 jdolecek Exp $");
 
 #include "opt_multiprocessor.h"
 
@@ -170,7 +170,7 @@
         * much. Need to change the prototypes of l/rcr0 too if you
         * want to correct it. */
        uint32_t cr0;
-       vaddr_t cr3, cr4;
+       vaddr_t cr4;
        uint32_t origcr0;
        vaddr_t origcr4;
 
@@ -221,8 +221,7 @@
         * to CR3)
         */
 
-       cr3 = rcr3();
-       lcr3(cr3);
+       tlbflush();
 
        /*
         * 8. Disable all range registers (by clearing the E flag in
@@ -262,7 +261,7 @@
         */
 
        wbinvd();
-       lcr3(cr3);
+       tlbflush();
 
        /*
         * 12. Enter the normal cache mode to reenable caching (set the CD and