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implement pmap_clear_modify() correctly.

This commit is contained in:
chs 2001-06-07 05:29:13 +00:00
parent ff5871412e
commit 762bab2606
1 changed files with 24 additions and 6 deletions
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30
sys/arch/vax/vax/pmap.c
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@ -1,4 +1,4 @@
/* $NetBSD: pmap.c,v 1.102 2001/06/06 06:23:13 chs Exp $ */
/* $NetBSD: pmap.c,v 1.103 2001/06/07 05:29:13 chs Exp $ */
/*
* Copyright (c) 1994, 1998, 1999 Ludd, University of Lule}, Sweden.
* All rights reserved.
@ -1209,7 +1209,8 @@ boolean_t
pmap_clear_modify(struct vm_page *pg)
{
paddr_t pa = VM_PAGE_TO_PHYS(pg);
struct pv_entry *pv;
struct pv_entry *pv;
boolean_t rv = FALSE;
#ifdef DEBUG
if (IOSPACE(pa))
@ -1221,22 +1222,39 @@ pmap_clear_modify(struct vm_page *pg)
if (startpmapdebug)
printf("pmap_clear_modify: pa %lx pv_entry %p\n", pa, pv);
#endif
PVTABLE_LOCK;
if (pv->pv_attr & PG_M) {
rv = TRUE;
}
pv->pv_attr &= ~PG_M;
PVTABLE_LOCK;
if (pv->pv_pte)
if (pv->pv_pte) {
if (pv->pv_pte[0].pg_m | pv->pv_pte[1].pg_m |
pv->pv_pte[2].pg_m | pv->pv_pte[3].pg_m |
pv->pv_pte[4].pg_m | pv->pv_pte[5].pg_m |
pv->pv_pte[6].pg_m | pv->pv_pte[7].pg_m) {
rv = TRUE;
}
pv->pv_pte[0].pg_m = pv->pv_pte[1].pg_m =
pv->pv_pte[2].pg_m = pv->pv_pte[3].pg_m =
pv->pv_pte[4].pg_m = pv->pv_pte[5].pg_m =
pv->pv_pte[6].pg_m = pv->pv_pte[7].pg_m = 0;
}
while ((pv = pv->pv_next))
while ((pv = pv->pv_next)) {
if (pv->pv_pte[0].pg_m | pv->pv_pte[1].pg_m |
pv->pv_pte[2].pg_m | pv->pv_pte[3].pg_m |
pv->pv_pte[4].pg_m | pv->pv_pte[5].pg_m |
pv->pv_pte[6].pg_m | pv->pv_pte[7].pg_m) {
rv = TRUE;
}
pv->pv_pte[0].pg_m = pv->pv_pte[1].pg_m =
pv->pv_pte[2].pg_m = pv->pv_pte[3].pg_m =
pv->pv_pte[4].pg_m = pv->pv_pte[5].pg_m =
pv->pv_pte[6].pg_m = pv->pv_pte[7].pg_m = 0;
}
PVTABLE_UNLOCK;
return TRUE; /* XXX */
return rv;
}
/*