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pmap_protect_noctx()
pmap_remove_noctx()
This commit is contained in:
gwr 1997-11-03 22:47:10 +00:00
parent f9356d1960
commit ea35849dac
1 changed files with 57 additions and 19 deletions
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76
sys/arch/sun3/sun3/pmap.c
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@ -1,4 +1,4 @@
/* $NetBSD: pmap.c,v 1.85 1997/11/03 21:55:39 gwr Exp $ */ /* $NetBSD: pmap.c,v 1.86 1997/11/03 22:47:10 gwr Exp $ */
/*- /*-
* Copyright (c) 1996 The NetBSD Foundation, Inc. * Copyright (c) 1996 The NetBSD Foundation, Inc.
@ -3144,7 +3144,7 @@ pmap_protect_mmu(pmap, sva, eva)
} }
#endif #endif
/* Remove write permission on PTEs in the given range. */ /* Remove write permission in the given range. */
for (pgva = sva; pgva < eva; pgva += NBPG) { for (pgva = sva; pgva < eva; pgva += NBPG) {
pte = get_pte(pgva); pte = get_pte(pgva);
if (pte & PG_VALID) { if (pte & PG_VALID) {
@ -3174,9 +3174,8 @@ pmap_protect_noctx(pmap, sva, eva)
pmap_t pmap; pmap_t pmap;
vm_offset_t sva, eva; vm_offset_t sva, eva;
{ {
int pte, sme, ptenum, segnum; int old_ctx, pte, sme, segnum;
vm_offset_t pgva; vm_offset_t pgva, segva;
pmeg_t pmegp;
CHECK_SPL(); CHECK_SPL();
@ -3188,24 +3187,39 @@ pmap_protect_noctx(pmap, sva, eva)
panic("pmap_protect_noctx: null segmap"); panic("pmap_protect_noctx: null segmap");
#endif #endif
segnum = VA_SEGNUM(sva); segva = m68k_trunc_seg(sva);
segnum = VA_SEGNUM(segva);
sme = pmap->pm_segmap[segnum]; sme = pmap->pm_segmap[segnum];
if (sme == SEGINV) if (sme == SEGINV)
return; return;
pmegp = pmeg_p(sme);
/*
* Borrow the EMPTY_CONTEXT so we can access the PMEG
* at its normal virtual address.
*/
old_ctx = get_context();
set_context(EMPTY_CONTEXT);
set_segmap(segva, sme);
/* Remove write permission in the given range. */ /* Remove write permission in the given range. */
for (pgva = sva; pgva < eva; pgva += NBPG) { for (pgva = sva; pgva < eva; pgva += NBPG) {
ptenum = VA_PTE_NUM(pgva); pte = get_pte(pgva);
pte = get_pte_pmeg(sme, ptenum);
if (pte & PG_VALID) { if (pte & PG_VALID) {
/* No cache flush needed. */
if (IS_MAIN_MEM(pte)) { if (IS_MAIN_MEM(pte)) {
save_modref_bits(pte); save_modref_bits(pte);
} }
pte &= ~(PG_WRITE | PG_MODREF); pte &= ~(PG_WRITE | PG_MODREF);
set_pte_pmeg(sme, ptenum, pte); set_pte(pgva, pte);
} }
} }
/*
* Make the EMPTY_CONTEXT really empty again, and
* restore the previous context.
*/
set_segmap(segva, SEGINV);
set_context(old_ctx);
} }
@ -3448,9 +3462,9 @@ pmap_remove_noctx(pmap, sva, eva)
pmap_t pmap; pmap_t pmap;
vm_offset_t sva, eva; vm_offset_t sva, eva;
{ {
int pte, sme, ptenum, segnum;
vm_offset_t pgva;
pmeg_t pmegp; pmeg_t pmegp;
int old_ctx, pte, sme, segnum;
vm_offset_t pgva, segva;
CHECK_SPL(); CHECK_SPL();
@ -3462,17 +3476,26 @@ pmap_remove_noctx(pmap, sva, eva)
panic("pmap_remove_noctx: null segmap"); panic("pmap_remove_noctx: null segmap");
#endif #endif
segnum = VA_SEGNUM(sva); segva = m68k_trunc_seg(sva);
segnum = VA_SEGNUM(segva);
sme = pmap->pm_segmap[segnum]; sme = pmap->pm_segmap[segnum];
if (sme == SEGINV) if (sme == SEGINV)
return; return;
pmegp = pmeg_p(sme); pmegp = pmeg_p(sme);
/* Remove mappings in the given range. */ /*
* Borrow the EMPTY_CONTEXT so we can access the PMEG
* at its normal virtual address.
*/
old_ctx = get_context();
set_context(EMPTY_CONTEXT);
set_segmap(segva, sme);
/* Invalidate the PTEs in the given range. */
for (pgva = sva; pgva < eva; pgva += NBPG) { for (pgva = sva; pgva < eva; pgva += NBPG) {
ptenum = VA_PTE_NUM(pgva); pte = get_pte(pgva);
pte = get_pte_pmeg(sme, ptenum);
if (pte & PG_VALID) { if (pte & PG_VALID) {
/* No cache flush needed. */
if (IS_MAIN_MEM(pte)) { if (IS_MAIN_MEM(pte)) {
save_modref_bits(pte); save_modref_bits(pte);
pv_unlink(pmap, PG_PA(pte), pgva); pv_unlink(pmap, PG_PA(pte), pgva);
@ -3484,13 +3507,28 @@ pmap_remove_noctx(pmap, sva, eva)
pmap, pgva, pte, PG_INVAL); pmap, pgva, pte, PG_INVAL);
} }
#endif #endif
set_pte_pmeg(sme, ptenum, PG_INVAL); set_pte(pgva, PG_INVAL);
pmegp->pmeg_vpages--; pmegp->pmeg_vpages--;
} }
} }
/*
* Make the EMPTY_CONTEXT really empty again, and
* restore the previous context.
*/
set_segmap(segva, SEGINV);
set_context(old_ctx);
if (pmegp->pmeg_vpages <= 0) { if (pmegp->pmeg_vpages <= 0) {
if (is_pmeg_wired(pmegp)) /* We are done with this pmeg. */
panic("pmap: removing wired"); if (is_pmeg_wired(pmegp)) {
#ifdef PMAP_DEBUG
if (pmap_debug & PMD_WIRING) {
db_printf("pmap: removing wired pmeg: %p\n", pmegp);
Debugger();
}
#endif /* PMAP_DEBUG */
}
pmap->pm_segmap[segnum] = SEGINV; pmap->pm_segmap[segnum] = SEGINV;
pmeg_free(pmegp); pmeg_free(pmegp);