[src/trunk]: src/sys/arch/mac68k/mac68k always map kernel text read-only.

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

details:   https://anonhg.NetBSD.org/src/rev/dffec59ae476
branches:  trunk
changeset: 573708:dffec59ae476
user:      chs <chs%NetBSD.org@localhost>
date:      Sat Feb 05 23:50:05 2005 +0000

description:
always map kernel text read-only.

diffstat:

 sys/arch/mac68k/mac68k/pmap_bootstrap.c |  20 ++++++++++++--------
 1 files changed, 12 insertions(+), 8 deletions(-)

diffs (51 lines):

diff -r aeb44aa4f806 -r dffec59ae476 sys/arch/mac68k/mac68k/pmap_bootstrap.c
--- a/sys/arch/mac68k/mac68k/pmap_bootstrap.c   Sat Feb 05 23:48:49 2005 +0000
+++ b/sys/arch/mac68k/mac68k/pmap_bootstrap.c   Sat Feb 05 23:50:05 2005 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pmap_bootstrap.c,v 1.61 2005/01/15 16:00:59 chs Exp $  */
+/*     $NetBSD: pmap_bootstrap.c,v 1.62 2005/02/05 23:50:05 chs Exp $  */
 
 /* 
  * Copyright (c) 1991, 1993
@@ -36,7 +36,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: pmap_bootstrap.c,v 1.61 2005/01/15 16:00:59 chs Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pmap_bootstrap.c,v 1.62 2005/02/05 23:50:05 chs Exp $");
 
 #include "opt_ddb.h"
 #include "opt_kgdb.h"
@@ -130,6 +130,7 @@
        int i;
        st_entry_t protoste, *ste;
        pt_entry_t protopte, *pte, *epte;
+       extern char start[];
 
        vidlen = m68k_round_page(((videosize >> 16) & 0xffff) * videorowbytes +
            m68k_page_offset(mac68k_vidphys));
@@ -354,15 +355,18 @@
                *pte++ = PG_NV;
 
        /*
-        * Validate PTEs for kernel text (RO)
+        * Validate PTEs for kernel text (RO).
+        * Pages up to "start" must be writable for the ROM.
         */
        pte = &(PA2VA(kptpa, u_int *))[m68k_btop(KERNBASE)];
+       epte = &pte[m68k_btop(m68k_round_page(start))];
+       protopte = firstpa | PG_RW | PG_V;
+       while (pte < epte) {
+               *pte++ = protopte;
+               protopte += PAGE_SIZE;
+       }
        epte = &pte[m68k_btop(m68k_trunc_page(&etext))];
-#if defined(KGDB) || defined(DDB)
-       protopte = firstpa | PG_RW | PG_V;      /* XXX RW for now */
-#else
-       protopte = firstpa | PG_RO | PG_V;
-#endif
+       protopte = (protopte & ~PG_PROT) | PG_RO;
        while (pte < epte) {
                *pte++ = protopte;
                protopte += PAGE_SIZE;