upstream/opnsense-src
1
0
Fork 0
mirror of https://github.com/opnsense/src.git synced 2026-05-28 04:12:45 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

Fix pmap_enter_quick() to stop it hanging when the level 2 pte exists

Browse source 
but isn't valid.

Reimplement pmap_remove() to be much more efficient at removing large
stretches of addresses.

As part of reimplementing pmap_remove() fix pmap_protect() so that it stands
a hope of working.
This commit is contained in:
Doug Rabson 1998-07-24 09:43:27 +00:00
parent a07f318f8c
commit 72c36e1413
1 changed files with 28 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

35
sys/alpha/alpha/pmap.c
View file

@ -43,7 +43,7 @@
* from: @(#)pmap.c 7.7 (Berkeley) 5/12/91
* from: i386 Id: pmap.c,v 1.193 1998/04/19 15:22:48 bde Exp
* with some ideas from NetBSD's alpha pmap
* $Id: pmap.c,v 1.3 1998/07/12 16:13:54 dfr Exp $
* $Id: pmap.c,v 1.4 1998/07/15 20:07:33 dfr Exp $
*/
/*
@ -214,8 +214,8 @@ pmap_break(void)
#define ALPHA_L1SIZE (1L << ALPHA_L1SHIFT)
#define ALPHA_L2SIZE (1L << ALPHA_L2SHIFT)
#define alpha_l1trunc(va) ((va) & (ALPHA_L1SIZE-1))
#define alpha_l2trunc(va) ((va) & (ALPHA_L2SIZE-1))
#define alpha_l1trunc(va) ((va) & ~(ALPHA_L1SIZE-1))
#define alpha_l2trunc(va) ((va) & ~(ALPHA_L2SIZE-1))
/*
* Get PDEs and PTEs for user/kernel address space
@ -1761,7 +1761,7 @@ pmap_remove_page(pmap_t pmap, vm_offset_t va)
void
pmap_remove(pmap_t pmap, vm_offset_t sva, vm_offset_t eva)
{
vm_offset_t va;
vm_offset_t va, nva1, nva2;
if (pmap == NULL)
return;
@ -1769,8 +1769,29 @@ pmap_remove(pmap_t pmap, vm_offset_t sva, vm_offset_t eva)
if (pmap->pm_stats.resident_count == 0)
return;
for (va = sva; va < eva; va += PAGE_SIZE)
pmap_remove_page(pmap, va);
/*
* special handling of removing one page. a very
* common operation and easy to short circuit some
* code.
*/
if (sva + PAGE_SIZE == eva) {
pmap_remove_page(pmap, sva);
return;
}
for (va = sva; va < eva; va = nva1) {
nva1 = alpha_l1trunc(va + ALPHA_L1SIZE - 1);
if (!pmap_pte_v(pmap_lev1pte(pmap, va)))
continue;
for (; va < eva && va < nva1; va = nva2) {
nva2 = alpha_l2trunc(va + ALPHA_L2SIZE - 1);
if (!pmap_pte_v(pmap_lev2pte(pmap, va)))
continue;
for (; va < eva && va < nva2; va += PAGE_SIZE)
pmap_remove_page(pmap, va);
}
}
}
/*
@ -2102,7 +2123,7 @@ retry:
* If the level 2 page table is mapped, we just increment
* the hold count, and activate it.
*/
if (l2pte) {
if (l2pte && pmap_pte_v(l2pte)) {
if (pmap->pm_ptphint &&
(pmap->pm_ptphint->pindex == ptepindex)) {
mpte = pmap->pm_ptphint;