[src/trunk]: src/sys/arch/sun2/sun2 Don't unmap the PROM's first four physica...

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

details:   https://anonhg.NetBSD.org/src/rev/c01e3b0b17d0
branches:  trunk
changeset: 511796:c01e3b0b17d0
user:      fredette <fredette%NetBSD.org@localhost>
date:      Wed Jun 27 03:41:27 2001 +0000

description:
Don't unmap the PROM's first four physical/virtual pages
inside pmap_bootstrap, instead we will wait until we have
installed our vector table.

diffstat:

 sys/arch/sun2/sun2/pmap.c |  11 ++++++-----
 1 files changed, 6 insertions(+), 5 deletions(-)

diffs (27 lines):

diff -r 7c760f1cd0f5 -r c01e3b0b17d0 sys/arch/sun2/sun2/pmap.c
--- a/sys/arch/sun2/sun2/pmap.c Wed Jun 27 03:32:49 2001 +0000
+++ b/sys/arch/sun2/sun2/pmap.c Wed Jun 27 03:41:27 2001 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pmap.c,v 1.12 2001/06/19 12:59:17 wiz Exp $    */
+/*     $NetBSD: pmap.c,v 1.13 2001/06/27 03:41:27 fredette Exp $       */
 
 /*-
  * Copyright (c) 1996 The NetBSD Foundation, Inc.
@@ -1684,12 +1684,13 @@
 
        /*
         * Physical/virtual pages zero through three are used by the 
-        * PROM.  prom_init has already saved the PTEs, now we get
-        * to unmap the pages.
+        * PROM.  prom_init has already saved the PTEs, but we don't
+        * want to unmap the pages until we've installed our own
+        * vector table - just in case something happens before then
+        * and we drop into the PROM.
         */
        eva = va + NBPG * 4;
-       for(; va < eva; va += NBPG)
-               set_pte(va, PG_INVAL);
+       va = eva;
 
        /*
         * We use pages four through seven for the msgbuf.