[src/trunk]: src/sys/arch/amd64/amd64 simplify

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

details:   https://anonhg.NetBSD.org/src/rev/61999dfab9e9
branches:  trunk
changeset: 356224:61999dfab9e9
user:      maxv <maxv%NetBSD.org@localhost>
date:      Sun Sep 10 10:51:13 2017 +0000

description:
simplify

diffstat:

 sys/arch/amd64/amd64/gdt.c |  17 ++++++++---------
 1 files changed, 8 insertions(+), 9 deletions(-)

diffs (49 lines):

diff -r d6e7a586653d -r 61999dfab9e9 sys/arch/amd64/amd64/gdt.c
--- a/sys/arch/amd64/amd64/gdt.c        Sun Sep 10 10:13:47 2017 +0000
+++ b/sys/arch/amd64/amd64/gdt.c        Sun Sep 10 10:51:13 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: gdt.c,v 1.42 2017/09/06 12:39:18 bouyer Exp $  */
+/*     $NetBSD: gdt.c,v 1.43 2017/09/10 10:51:13 maxv Exp $    */
 
 /*
  * Copyright (c) 1996, 1997, 2009 The NetBSD Foundation, Inc.
@@ -37,7 +37,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: gdt.c,v 1.42 2017/09/06 12:39:18 bouyer Exp $");
+__KERNEL_RCSID(0, "$NetBSD: gdt.c,v 1.43 2017/09/10 10:51:13 maxv Exp $");
 
 #include "opt_multiprocessor.h"
 #include "opt_xen.h"
@@ -300,12 +300,12 @@
 lgdt(struct region_descriptor *desc)
 {
        paddr_t frames[16];
-       int i;
+       size_t i;
        vaddr_t va;
 
        /*
-        * XXX: Xen even checks descriptors AFTER limit.
-        * Zero out last frame after limit if needed.
+        * Xen even checks descriptors AFTER limit. Zero out last frame after
+        * limit if needed.
         */
        va = desc->rd_base + desc->rd_limit + 1;
        memset((void *)va, 0, roundup(va, PAGE_SIZE) - va);
@@ -315,11 +315,10 @@
         * Xen. Mark pages R/O too, otherwise Xen will refuse to use them.
         */
        for (i = 0; i < roundup(desc->rd_limit, PAGE_SIZE) >> PAGE_SHIFT; i++) {
-               frames[i] = ((paddr_t) xpmap_ptetomach(
-                   (pt_entry_t *)(desc->rd_base + (i << PAGE_SHIFT)))) >>
+               va = desc->rd_base + (i << PAGE_SHIFT);
+               frames[i] = ((paddr_t)xpmap_ptetomach((pt_entry_t *)va)) >>
                    PAGE_SHIFT;
-               pmap_pte_clearbits(kvtopte(desc->rd_base + (i << PAGE_SHIFT)),
-                   PG_RW);
+               pmap_pte_clearbits(kvtopte(va), PG_RW);
        }
 
        if (HYPERVISOR_set_gdt(frames, (desc->rd_limit + 1) >> 3))