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Panic if access_type has bits not in prot.

This commit is contained in:
mycroft 1999-03-29 05:31:24 +00:00
parent 4924ddc041
commit e3c8daf920
1 changed files with 6 additions and 11 deletions
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17
sys/arch/alpha/alpha/pmap.c
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@ -1,4 +1,4 @@
/* $NetBSD: pmap.c,v 1.87 1999/03/27 02:48:32 thorpej Exp $ */
/* $NetBSD: pmap.c,v 1.88 1999/03/29 05:31:24 mycroft Exp $ */
/*-
* Copyright (c) 1998, 1999 The NetBSD Foundation, Inc.
@ -155,7 +155,7 @@
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.87 1999/03/27 02:48:32 thorpej Exp $");
__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.88 1999/03/29 05:31:24 mycroft Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -1773,15 +1773,10 @@ pmap_enter(pmap, va, pa, prot, wired, access_type)
if (managed) {
struct pv_head *pvh = pa_to_pvh(pa);
/*
* An obvious question here is why a page would be entered in
* response to a fault, but with permissions less than those
* requested. This can happen in the case of a copy-on-write
* page that's not currently mapped being accessed; the first
* fault will map the original page read-only, and another
* fault will be taken to do the copy and make it read-write.
*/
access_type &= prot;
#ifdef DIAGNOSTIC
if (access_type & ~prot)
panic("pmap_enter: access_type exceeds prot");
#endif
if (access_type & VM_PROT_WRITE)
pvh->pvh_attrs |= (PGA_REFERENCED|PGA_MODIFIED);
else if (access_type & VM_PROT_ALL)