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always map kernel text read-only.

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This commit is contained in:
chs 2005-02-05 23:50:05 +00:00
parent 42c10f81be
commit 86688c638a
1 changed files with 12 additions and 8 deletions
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20
sys/arch/mac68k/mac68k/pmap_bootstrap.c
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@ -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 @@ pmap_bootstrap(paddr_t nextpa, paddr_t firstpa)
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 @@ pmap_bootstrap(paddr_t nextpa, paddr_t firstpa)
*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;