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For armv6(VIPT), change the rules for mapping via kenter_pa. Allow readonly 

pages to be mapped by different cache color indexes.
This commit is contained in:
matt 2008-07-03 06:13:41 +00:00
parent 52956f334c
commit 6a96a3909c
1 changed files with 43 additions and 14 deletions
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57
sys/arch/arm/arm32/pmap.c
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@ -1,4 +1,4 @@
/* $NetBSD: pmap.c,v 1.178 2008/06/24 22:00:32 scw Exp $ */
/* $NetBSD: pmap.c,v 1.179 2008/07/03 06:13:41 matt Exp $ */
/*
* Copyright 2003 Wasabi Systems, Inc.
@ -211,7 +211,7 @@
#include <machine/param.h>
#include <arm/arm32/katelib.h>
__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.178 2008/06/24 22:00:32 scw Exp $");
__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.179 2008/07/03 06:13:41 matt Exp $");
#ifdef PMAP_DEBUG
@ -1811,11 +1811,17 @@ pmap_vac_me_harder(struct vm_page *pg, pmap_t pm, vaddr_t va)
tst_mask = pv->pv_va;
pv = pv->pv_next;
}
tst_mask &= arm_cache_prefer_mask;
for (; pv && !bad_alias; pv = pv->pv_next) {
/* if there's a bad alias, stop checking. */
if (tst_mask != (pv->pv_va & arm_cache_prefer_mask))
bad_alias = true;
/*
* Only check for a bad alias if we have writable mappings.
*/
if (pg->mdpage.urw_mappings + pg->mdpage.krw_mappings > 0
|| (pg->mdpage.pvh_attrs & PVF_KENTRY)) {
tst_mask &= arm_cache_prefer_mask;
for (; pv && !bad_alias; pv = pv->pv_next) {
/* if there's a bad alias, stop checking. */
if (tst_mask != (pv->pv_va & arm_cache_prefer_mask))
bad_alias = true;
}
}
/* If no conflicting colors, set everything back to cached */
if (!bad_alias) {
@ -1847,7 +1853,13 @@ pmap_vac_me_harder(struct vm_page *pg, pmap_t pm, vaddr_t va)
pg->mdpage.pvh_attrs |= PVF_COLORED
| (va & arm_cache_prefer_mask);
return;
} else if (!((pg->mdpage.pvh_attrs ^ va) & arm_cache_prefer_mask)) {
} else if (!((pg->mdpage.pvh_attrs ^ va) & arm_cache_prefer_mask)
/*
* If the VA matches the existing color or if all the mappings
* are read-only, don't do anything.
*/
|| (pg->mdpage.urw_mappings + pg->mdpage.krw_mappings == 0
&& (pg->mdpage.pvh_attrs & PVF_KENTRY) == 0)) {
if (pm == NULL) {
pg->mdpage.pvh_attrs &= PAGE_SIZE - 1;
pg->mdpage.pvh_attrs |= va;
@ -3094,9 +3106,21 @@ pmap_kenter_pa(vaddr_t va, paddr_t pa, vm_prot_t prot)
#ifdef PMAP_CACHE_VIPT
if (pg) {
simple_lock(&pg->mdpage.pvh_slock);
KASSERT((pg->mdpage.pvh_attrs & PVF_KENTRY) == 0);
pg->mdpage.pvh_attrs |= PVF_KENTRY;
pmap_vac_me_harder(pg, NULL, va);
if (prot & VM_PROT_WRITE) {
/*
* If they want a writeable page, make sure it
* isn't already mapped in the kernel.
*/
KASSERT((pg->mdpage.pvh_attrs & PVF_KENTRY) == 0);
KASSERT(pg->mdpage.kro_mappings == 0);
pg->mdpage.pvh_attrs |= PVF_KENTRY;
pmap_vac_me_harder(pg, NULL, va);
} else {
KASSERT(pg->mdpage.krw_mappings == 0);
KASSERT(pg->mdpage.urw_mappings == 0);
KASSERT((pg->mdpage.pvh_attrs & PVF_NC) == 0);
pg->mdpage.kro_mappings++;
}
simple_unlock(&pg->mdpage.pvh_slock);
}
#endif
@ -3137,7 +3161,6 @@ pmap_kremove(vaddr_t va, vsize_t len)
opg = PHYS_TO_VM_PAGE(l2pte_pa(opte));
if (opg) {
simple_lock(&opg->mdpage.pvh_slock);
KASSERT(opg->mdpage.pvh_attrs & PVF_KENTRY);
if (PV_IS_EXEC_P(opg->mdpage.pvh_attrs)
&& !(opg->mdpage.pvh_attrs & PVF_NC)) {
if (opg->mdpage.pvh_list == NULL) {
@ -3150,8 +3173,14 @@ pmap_kremove(vaddr_t va, vsize_t len)
}
}
KASSERT(opg->mdpage.pvh_attrs & (PVF_COLORED|PVF_NC));
opg->mdpage.pvh_attrs &= ~PVF_KENTRY;
pmap_vac_me_harder(opg, NULL, 0);
if (L2_AP(AP_W) & opte) {
KASSERT(opg->mdpage.pvh_attrs & PVF_KENTRY);
opg->mdpage.pvh_attrs &= ~PVF_KENTRY;
pmap_vac_me_harder(opg, NULL, 0);
} else {
KASSERT(opg->mdpage.kro_mappings > 0);
opg->mdpage.kro_mappings--;
}
simple_unlock(&opg->mdpage.pvh_slock);
}
#endif