[src/trunk]: src/sys/arch/i386/i386 Fix "use before init" of *idt.

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

details:   https://anonhg.NetBSD.org/src/rev/b10c61ae4bb2
branches:  trunk
changeset: 433705:b10c61ae4bb2
user:      cherry <cherry%NetBSD.org@localhost>
date:      Sat Sep 29 07:00:20 2018 +0000

description:
Fix "use before init" of *idt.
This should fix boot time pagefaulting and panic(9)
on XEN kernels due to the boottime idt API reorg.

diffstat:

 sys/arch/i386/i386/machdep.c |  8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diffs (34 lines):

diff -r c2d032a23cdb -r b10c61ae4bb2 sys/arch/i386/i386/machdep.c
--- a/sys/arch/i386/i386/machdep.c      Sat Sep 29 06:48:22 2018 +0000
+++ b/sys/arch/i386/i386/machdep.c      Sat Sep 29 07:00:20 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: machdep.c,v 1.810 2018/09/23 15:28:48 cherry Exp $     */
+/*     $NetBSD: machdep.c,v 1.811 2018/09/29 07:00:20 cherry Exp $     */
 
 /*
  * Copyright (c) 1996, 1997, 1998, 2000, 2004, 2006, 2008, 2009, 2017
@@ -67,7 +67,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.810 2018/09/23 15:28:48 cherry Exp $");
+__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.811 2018/09/29 07:00:20 cherry Exp $");
 
 #include "opt_beep.h"
 #include "opt_compat_freebsd.h"
@@ -1307,13 +1307,13 @@
        memset((void *)gdt_vaddr, 0, PAGE_SIZE);
        memset((void *)ldt_vaddr, 0, PAGE_SIZE);
 
-#ifndef XEN
        pmap_kenter_pa(pentium_idt_vaddr, idt_paddr, VM_PROT_READ, 0);
        pmap_update(pmap_kernel());
        pentium_idt = (union descriptor *)pentium_idt_vaddr;
+       idt = (idt_descriptor_t *)idt_vaddr;
 
+#ifndef XEN    
        tgdt = gdtstore;
-       idt = (struct gate_descriptor *)idt_vaddr;
        gdtstore = (union descriptor *)gdt_vaddr;
        ldtstore = (union descriptor *)ldt_vaddr;