Increase the efficiency of pmap_l{2,3}pte() somewhat, by allowing the
caller to pass an optional 3rd argument, which is the previous level PTE corresponding the virtual address. If this argument is non-NULL, the table walk otherwise necessary will be bypassed.
This commit is contained in:
thorpej
parent
a53c1863fe
commit
30188853dc
@ -1,4 +1,4 @@
|
||||
/* $NetBSD: pmap.c,v 1.31 1998/04/15 00:46:57 mjacob Exp $ */
|
||||
/* $NetBSD: pmap.c,v 1.32 1998/04/27 19:07:03 thorpej Exp $ */
|
||||
|
||||
/*-
|
||||
* Copyright (c) 1998 The NetBSD Foundation, Inc.
|
||||
@ -161,7 +161,7 @@
|
||||
|
||||
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
|
||||
|
||||
__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.31 1998/04/15 00:46:57 mjacob Exp $");
|
||||
__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.32 1998/04/27 19:07:03 thorpej Exp $");
|
||||
|
||||
#include <sys/param.h>
|
||||
#include <sys/systm.h>
|
||||
@ -611,17 +611,21 @@ do { \
|
||||
#ifdef DEBUG
|
||||
#define PMAP_KERNEL_PTE(va) \
|
||||
({ \
|
||||
if (pmap_pte_v(pmap_l1pte(pmap_kernel(), va)) == 0) { \
|
||||
pt_entry_t *l1pte_, *l2pte_; \
|
||||
\
|
||||
l1pte_ = pmap_l1pte(pmap_kernel(), va); \
|
||||
if (pmap_pte_v(l1pte_) == 0) { \
|
||||
printf("kernel level 1 PTE not valid, va 0x%lx " \
|
||||
"(line %ld)\n", (va), __LINE__); \
|
||||
panic("PMAP_KERNEL_PTE"); \
|
||||
} \
|
||||
if (pmap_pte_v(pmap_l2pte(pmap_kernel(), va)) == 0) { \
|
||||
l2pte_ = pmap_l2pte(pmap_kernel(), va, l1pte_); \
|
||||
if (pmap_pte_v(l2pte_) == 0) { \
|
||||
printf("kernel level 2 PTE not valid, va 0x%lx " \
|
||||
"(line %ld)\n", (va), __LINE__); \
|
||||
panic("PMAP_KERNEL_PTE"); \
|
||||
} \
|
||||
pmap_l3pte(pmap_kernel(), va); \
|
||||
pmap_l3pte(pmap_kernel(), va, l2pte_); \
|
||||
})
|
||||
#else
|
||||
#define PMAP_KERNEL_PTE(va) (&VPT[VPT_INDEX((va))])
|
||||
@ -1153,7 +1157,7 @@ pmap_remove(pmap, sva, eva)
|
||||
register pmap_t pmap;
|
||||
register vm_offset_t sva, eva;
|
||||
{
|
||||
register pt_entry_t *pte;
|
||||
register pt_entry_t *l1pte, *l2pte, *l3pte;
|
||||
|
||||
#ifdef DEBUG
|
||||
if (pmapdebug & (PDB_FOLLOW|PDB_REMOVE|PDB_PROTECT))
|
||||
@ -1171,7 +1175,8 @@ pmap_remove(pmap, sva, eva)
|
||||
/*
|
||||
* If level 1 mapping is invalid, just skip it.
|
||||
*/
|
||||
if (pmap_pte_v(pmap_l1pte(pmap, sva)) == 0) {
|
||||
l1pte = pmap_l1pte(pmap, sva);
|
||||
if (pmap_pte_v(l1pte) == 0) {
|
||||
sva = alpha_trunc_l1seg(sva) + ALPHA_L1SEG_SIZE;
|
||||
continue;
|
||||
}
|
||||
@ -1179,7 +1184,8 @@ pmap_remove(pmap, sva, eva)
|
||||
/*
|
||||
* If level 2 mapping is invalid, just skip it.
|
||||
*/
|
||||
if (pmap_pte_v(pmap_l2pte(pmap, sva)) == 0) {
|
||||
l2pte = pmap_l2pte(pmap, sva, l1pte);
|
||||
if (pmap_pte_v(l2pte) == 0) {
|
||||
sva = alpha_trunc_l2seg(sva) + ALPHA_L2SEG_SIZE;
|
||||
continue;
|
||||
}
|
||||
@ -1187,9 +1193,9 @@ pmap_remove(pmap, sva, eva)
|
||||
/*
|
||||
* Invalidate the mapping if it's valid.
|
||||
*/
|
||||
pte = pmap_l3pte(pmap, sva);
|
||||
if (pmap_pte_v(pte))
|
||||
pmap_remove_mapping(pmap, sva, pte);
|
||||
l3pte = pmap_l3pte(pmap, sva, l2pte);
|
||||
if (pmap_pte_v(l3pte))
|
||||
pmap_remove_mapping(pmap, sva, l3pte);
|
||||
sva += PAGE_SIZE;
|
||||
}
|
||||
}
|
||||
@ -1264,9 +1270,9 @@ pmap_page_protect(pa, prot)
|
||||
|
||||
nextpv = LIST_NEXT(pv, pv_list);
|
||||
|
||||
pte = pmap_l3pte(pv->pv_pmap, pv->pv_va);
|
||||
pte = pmap_l3pte(pv->pv_pmap, pv->pv_va, NULL);
|
||||
#ifdef DEBUG
|
||||
if (pmap_pte_v(pmap_l2pte(pv->pv_pmap, pv->pv_va)) == 0 ||
|
||||
if (pmap_pte_v(pmap_l2pte(pv->pv_pmap, pv->pv_va, NULL)) == 0 ||
|
||||
pmap_pte_pa(pte) != pa)
|
||||
panic("pmap_page_protect: bad mapping");
|
||||
#endif
|
||||
@ -1301,7 +1307,7 @@ pmap_protect(pmap, sva, eva, prot)
|
||||
register vm_offset_t sva, eva;
|
||||
vm_prot_t prot;
|
||||
{
|
||||
register pt_entry_t *pte, bits;
|
||||
register pt_entry_t *l1pte, *l2pte, *l3pte, bits;
|
||||
boolean_t isactive;
|
||||
boolean_t hadasm;
|
||||
|
||||
@ -1333,7 +1339,8 @@ pmap_protect(pmap, sva, eva, prot)
|
||||
/*
|
||||
* If level 1 mapping is invalid, just skip it.
|
||||
*/
|
||||
if (pmap_pte_v(pmap_l1pte(pmap, sva)) == 0) {
|
||||
l1pte = pmap_l1pte(pmap, sva);
|
||||
if (pmap_pte_v(l1pte) == 0) {
|
||||
sva = alpha_trunc_l1seg(sva) + ALPHA_L1SEG_SIZE;
|
||||
continue;
|
||||
}
|
||||
@ -1341,7 +1348,8 @@ pmap_protect(pmap, sva, eva, prot)
|
||||
/*
|
||||
* If level 2 mapping is invalid, just skip it.
|
||||
*/
|
||||
if (pmap_pte_v(pmap_l2pte(pmap, sva)) == 0) {
|
||||
l2pte = pmap_l2pte(pmap, sva, l1pte);
|
||||
if (pmap_pte_v(l2pte) == 0) {
|
||||
sva = alpha_trunc_l2seg(sva) + ALPHA_L2SEG_SIZE;
|
||||
continue;
|
||||
}
|
||||
@ -1350,10 +1358,10 @@ pmap_protect(pmap, sva, eva, prot)
|
||||
* Change protection on mapping if it is valid and doesn't
|
||||
* already have the correct protection.
|
||||
*/
|
||||
pte = pmap_l3pte(pmap, sva);
|
||||
if (pmap_pte_v(pte) && pmap_pte_prot_chg(pte, bits)) {
|
||||
hadasm = (pmap_pte_asm(pte) != 0);
|
||||
pmap_pte_set_prot(pte, bits);
|
||||
l3pte = pmap_l3pte(pmap, sva, l2pte);
|
||||
if (pmap_pte_v(l3pte) && pmap_pte_prot_chg(l3pte, bits)) {
|
||||
hadasm = (pmap_pte_asm(l3pte) != 0);
|
||||
pmap_pte_set_prot(l3pte, bits);
|
||||
PMAP_INVALIDATE_TLB(pmap, sva, hadasm, isactive,
|
||||
(prot & VM_PROT_EXECUTE) != 0);
|
||||
#ifdef PMAPSTATS
|
||||
@ -1361,7 +1369,7 @@ pmap_protect(pmap, sva, eva, prot)
|
||||
#endif
|
||||
}
|
||||
#ifdef PMAPSTATS
|
||||
else if (pmap_pte_v(pte)) {
|
||||
else if (pmap_pte_v(l3pte)) {
|
||||
if (isro)
|
||||
protect_stats.alreadyro++;
|
||||
else
|
||||
@ -1470,7 +1478,7 @@ pmap_enter(pmap, va, pa, prot, wired)
|
||||
* A reference will be added to the level 3 table when
|
||||
* the mapping is validated.
|
||||
*/
|
||||
l2pte = pmap_l2pte(pmap, va);
|
||||
l2pte = pmap_l2pte(pmap, va, l1pte);
|
||||
if (pmap_pte_v(l2pte) == 0) {
|
||||
pmap_alloc_ptpage(pmap, l2pte);
|
||||
pmap_ptpage_addref(l2pte);
|
||||
@ -1485,7 +1493,7 @@ pmap_enter(pmap, va, pa, prot, wired)
|
||||
/*
|
||||
* Get the PTE that will map the page.
|
||||
*/
|
||||
pte = pmap_l3pte(pmap, va);
|
||||
pte = pmap_l3pte(pmap, va, l2pte);
|
||||
}
|
||||
|
||||
/*
|
||||
@ -1769,14 +1777,14 @@ pmap_change_wiring(pmap, va, wired)
|
||||
if (pmap == NULL)
|
||||
return;
|
||||
|
||||
pte = pmap_l3pte(pmap, va);
|
||||
pte = pmap_l3pte(pmap, va, NULL);
|
||||
#ifdef DEBUG
|
||||
/*
|
||||
* Page table page is not allocated.
|
||||
* Should this ever happen? Ignore it for now,
|
||||
* we don't want to force allocation of unnecessary PTE pages.
|
||||
*/
|
||||
if (pmap_pte_v(pmap_l2pte(pmap, va)) == 0) {
|
||||
if (pmap_pte_v(pmap_l2pte(pmap, va, NULL)) == 0) {
|
||||
if (pmapdebug & PDB_PARANOIA)
|
||||
printf("pmap_change_wiring: invalid STE for %lx\n", va);
|
||||
return;
|
||||
@ -1815,7 +1823,7 @@ pmap_extract(pmap, va)
|
||||
register pmap_t pmap;
|
||||
vm_offset_t va;
|
||||
{
|
||||
pt_entry_t *pte;
|
||||
pt_entry_t *l1pte, *l2pte, *l3pte;
|
||||
register vm_offset_t pa;
|
||||
|
||||
#ifdef DEBUG
|
||||
@ -1824,16 +1832,19 @@ pmap_extract(pmap, va)
|
||||
#endif
|
||||
pa = 0;
|
||||
|
||||
if (pmap_pte_v(pmap_l1pte(pmap, va)) == 0)
|
||||
goto out;
|
||||
if (pmap_pte_v(pmap_l2pte(pmap, va)) == 0)
|
||||
l1pte = pmap_l1pte(pmap, va);
|
||||
if (pmap_pte_v(l1pte) == 0)
|
||||
goto out;
|
||||
|
||||
pte = pmap_l3pte(pmap, va);
|
||||
if (pmap_pte_v(pte) == 0)
|
||||
l2pte = pmap_l2pte(pmap, va, l1pte);
|
||||
if (pmap_pte_v(l2pte) == 0)
|
||||
goto out;
|
||||
|
||||
pa = pmap_pte_pa(pte) | (va & PGOFSET);
|
||||
l3pte = pmap_l3pte(pmap, va, l2pte);
|
||||
if (pmap_pte_v(l3pte) == 0)
|
||||
goto out;
|
||||
|
||||
pa = pmap_pte_pa(l3pte) | (va & PGOFSET);
|
||||
|
||||
out:
|
||||
#ifdef DEBUG
|
||||
@ -2333,7 +2344,7 @@ pmap_remove_mapping(pmap, va, pte)
|
||||
* PTE not provided, compute it from pmap and va.
|
||||
*/
|
||||
if (pte == PT_ENTRY_NULL) {
|
||||
pte = pmap_l3pte(pmap, va);
|
||||
pte = pmap_l3pte(pmap, va, NULL);
|
||||
if (pmap_pte_v(pte) == 0)
|
||||
return;
|
||||
}
|
||||
@ -2371,7 +2382,7 @@ pmap_remove_mapping(pmap, va, pte)
|
||||
pt_entry_t *l1pte, *l2pte;
|
||||
|
||||
l1pte = pmap_l1pte(pmap, va);
|
||||
l2pte = pmap_l2pte(pmap, va);
|
||||
l2pte = pmap_l2pte(pmap, va, l1pte);
|
||||
|
||||
/*
|
||||
* Delete the reference on the level 3 table.
|
||||
@ -2510,7 +2521,7 @@ pmap_changebit(pa, bit, setem)
|
||||
#endif
|
||||
}
|
||||
|
||||
pte = pmap_l3pte(pv->pv_pmap, va);
|
||||
pte = pmap_l3pte(pv->pv_pmap, va, NULL);
|
||||
if (setem)
|
||||
npte = *pte | bit;
|
||||
else
|
||||
@ -2575,7 +2586,7 @@ pmap_emulate_reference(p, v, user, write)
|
||||
if (p->p_vmspace == NULL)
|
||||
panic("pmap_emulate_reference: bad p_vmspace");
|
||||
#endif
|
||||
pte = pmap_l3pte(p->p_vmspace->vm_map.pmap, v);
|
||||
pte = pmap_l3pte(p->p_vmspace->vm_map.pmap, v, NULL);
|
||||
}
|
||||
#ifdef DEBUG
|
||||
if (pmapdebug & PDB_FOLLOW) {
|
||||
|
||||
@ -1,4 +1,4 @@
|
||||
/* $NetBSD: pmap.h,v 1.14 1998/04/15 21:42:24 mjacob Exp $ */
|
||||
/* $NetBSD: pmap.h,v 1.15 1998/04/27 19:07:03 thorpej Exp $ */
|
||||
|
||||
/*-
|
||||
* Copyright (c) 1998 The NetBSD Foundation, Inc.
|
||||
@ -215,42 +215,48 @@ do { \
|
||||
|
||||
#define pmap_pte_prot_chg(pte, np) ((np) ^ pmap_pte_prot(pte))
|
||||
|
||||
static __inline pt_entry_t *pmap_l2pte __P((pmap_t, vm_offset_t));
|
||||
static __inline pt_entry_t *pmap_l3pte __P((pmap_t, vm_offset_t));
|
||||
static __inline pt_entry_t *pmap_l2pte __P((pmap_t, vm_offset_t, pt_entry_t *));
|
||||
static __inline pt_entry_t *pmap_l3pte __P((pmap_t, vm_offset_t, pt_entry_t *));
|
||||
|
||||
#define pmap_l1pte(pmap, v) \
|
||||
(&(pmap)->pm_lev1map[l1pte_index((vm_offset_t)(v))])
|
||||
|
||||
static __inline pt_entry_t *
|
||||
pmap_l2pte(pmap, v)
|
||||
pmap_l2pte(pmap, v, l1pte)
|
||||
pmap_t pmap;
|
||||
vm_offset_t v;
|
||||
pt_entry_t *l1pte;
|
||||
{
|
||||
pt_entry_t *l1pte, *lev2map;
|
||||
pt_entry_t *lev2map;
|
||||
|
||||
l1pte = pmap_l1pte(pmap, v);
|
||||
if (pmap_pte_v(l1pte) == 0)
|
||||
return (NULL);
|
||||
if (l1pte == NULL) {
|
||||
l1pte = pmap_l1pte(pmap, v);
|
||||
if (pmap_pte_v(l1pte) == 0)
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
lev2map = (pt_entry_t *)ALPHA_PHYS_TO_K0SEG(pmap_pte_pa(l1pte));
|
||||
return (&lev2map[l2pte_index(v)]);
|
||||
}
|
||||
|
||||
static __inline pt_entry_t *
|
||||
pmap_l3pte(pmap, v)
|
||||
pmap_l3pte(pmap, v, l2pte)
|
||||
pmap_t pmap;
|
||||
vm_offset_t v;
|
||||
pt_entry_t *l2pte;
|
||||
{
|
||||
pt_entry_t *l1pte, *lev2map, *l2pte, *lev3map;
|
||||
pt_entry_t *l1pte, *lev2map, *lev3map;
|
||||
|
||||
l1pte = pmap_l1pte(pmap, v);
|
||||
if (pmap_pte_v(l1pte) == 0)
|
||||
return (NULL);
|
||||
if (l2pte == NULL) {
|
||||
l1pte = pmap_l1pte(pmap, v);
|
||||
if (pmap_pte_v(l1pte) == 0)
|
||||
return (NULL);
|
||||
|
||||
lev2map = (pt_entry_t *)ALPHA_PHYS_TO_K0SEG(pmap_pte_pa(l1pte));
|
||||
l2pte = &lev2map[l2pte_index(v)];
|
||||
if (pmap_pte_v(l2pte) == 0)
|
||||
return (NULL);
|
||||
lev2map = (pt_entry_t *)ALPHA_PHYS_TO_K0SEG(pmap_pte_pa(l1pte));
|
||||
l2pte = &lev2map[l2pte_index(v)];
|
||||
if (pmap_pte_v(l2pte) == 0)
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
lev3map = (pt_entry_t *)ALPHA_PHYS_TO_K0SEG(pmap_pte_pa(l2pte));
|
||||
return (&lev3map[l3pte_index(v)]);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user