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Make sure that we pmap_update AFTER modifying the page table entries.

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The P6 can do a serious job of reordering code, and our stuff could
execute incorrectly.
This commit is contained in:
John Dyson 1996-03-13 00:39:45 +00:00
parent da1842c866
commit 3ce8e60f5b
2 changed files with 14 additions and 14 deletions
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14
sys/amd64/amd64/pmap.c
View file

@ -39,7 +39,7 @@
* SUCH DAMAGE.
*
* from: @(#)pmap.c 7.7 (Berkeley) 5/12/91
* $Id: pmap.c,v 1.79 1996/03/10 23:06:00 dyson Exp $
* $Id: pmap.c,v 1.80 1996/03/11 05:55:56 hsu Exp $
*/
/*
@ -1457,9 +1457,9 @@ validate:
* to update the pte.
*/
if ((origpte & ~(PG_M|PG_U)) != newpte) {
*pte = (pt_entry_t) newpte;
if (origpte)
pmap_update_1pg(va);
*pte = (pt_entry_t) newpte;
}
if (origpte == 0) {
@ -1493,9 +1493,9 @@ pmap_qenter(va, m, count)
pt_entry_t npte = (pt_entry_t) ((int) (VM_PAGE_TO_PHYS(m[i]) | PG_RW | PG_V));
pt_entry_t opte;
pte = vtopte(tva);
if ((opte = *pte) && (opte != npte))
pmap_update_1pg(tva);
opte = *pte;
*pte = npte;
if (opte) pmap_update_1pg(tva);
}
}
/*
@ -1529,13 +1529,13 @@ pmap_kenter(va, pa)
register vm_offset_t pa;
{
register pt_entry_t *pte;
pt_entry_t npte;
pt_entry_t npte, opte;
npte = (pt_entry_t) ((int) (pa | PG_RW | PG_V));
pte = vtopte(va);
if (*pte)
pmap_update_1pg(va);
opte = *pte;
*pte = npte;
if (opte) pmap_update_1pg(va);
}
/*

14
sys/i386/i386/pmap.c
View file

@ -39,7 +39,7 @@
* SUCH DAMAGE.
*
* from: @(#)pmap.c 7.7 (Berkeley) 5/12/91
* $Id: pmap.c,v 1.79 1996/03/10 23:06:00 dyson Exp $
* $Id: pmap.c,v 1.80 1996/03/11 05:55:56 hsu Exp $
*/
/*
@ -1457,9 +1457,9 @@ validate:
* to update the pte.
*/
if ((origpte & ~(PG_M|PG_U)) != newpte) {
*pte = (pt_entry_t) newpte;
if (origpte)
pmap_update_1pg(va);
*pte = (pt_entry_t) newpte;
}
if (origpte == 0) {
@ -1493,9 +1493,9 @@ pmap_qenter(va, m, count)
pt_entry_t npte = (pt_entry_t) ((int) (VM_PAGE_TO_PHYS(m[i]) | PG_RW | PG_V));
pt_entry_t opte;
pte = vtopte(tva);
if ((opte = *pte) && (opte != npte))
pmap_update_1pg(tva);
opte = *pte;
*pte = npte;
if (opte) pmap_update_1pg(tva);
}
}
/*
@ -1529,13 +1529,13 @@ pmap_kenter(va, pa)
register vm_offset_t pa;
{
register pt_entry_t *pte;
pt_entry_t npte;
pt_entry_t npte, opte;
npte = (pt_entry_t) ((int) (pa | PG_RW | PG_V));
pte = vtopte(va);
if (*pte)
pmap_update_1pg(va);
opte = *pte;
*pte = npte;
if (opte) pmap_update_1pg(va);
}
/*