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me_free(): it makes no sense to try and update the ref/mod PTE bits here.

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This commit is contained in:
pk 2003-06-28 09:51:04 +00:00
parent 501a19cbfa
commit 75fe06e6e3
1 changed files with 36 additions and 33 deletions
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69
sys/arch/sparc/sparc/pmap.c
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@ -1,4 +1,4 @@
/* $NetBSD: pmap.c,v 1.259 2003/06/27 16:44:03 pk Exp $ */
/* $NetBSD: pmap.c,v 1.260 2003/06/28 09:51:04 pk Exp $ */
/*
* Copyright (c) 1996
@ -1574,6 +1574,12 @@ me_alloc(mh, newpm, newvreg, newvseg)
sp = &rp->rg_segmap[me->me_vseg];
pte = sp->sg_pte;
#ifdef DEBUG
if (sp->sg_pmeg != me->me_cookie)
panic("me_alloc: wrong sg_pmeg (%d != %d)",
sp->sg_pmeg, me->me_cookie);
#endif
/*
* The PMEG must be mapped into some context so that we can
* read its PTEs. Use its current context if it has one;
@ -1605,19 +1611,24 @@ me_alloc(mh, newpm, newvreg, newvseg)
*/
write_user_windows();
if (CTX_USABLE(pm,rp)) {
va = VSTOVA(me->me_vreg, me->me_vseg);
#ifdef DEBUG
if (getsegmap(va) != me->me_cookie)
panic("me_alloc: wrong pmeg in MMU (%ld != %d)",
getsegmap(va), me->me_cookie);
#endif
setcontext4(pm->pm_ctxnum);
cache_flush_segment(me->me_vreg, me->me_vseg, pm->pm_ctxnum);
va = VSTOVA(me->me_vreg,me->me_vseg);
} else {
va = 0;
setcontext4(0);
if (HASSUN4_MMU3L)
setregmap(0, tregion);
setsegmap(0, me->me_cookie);
setregmap(va, tregion);
setsegmap(va, me->me_cookie);
/*
* No cache flush needed: it happened earlier when
* the old context was taken.
*/
va = 0;
}
/*
@ -1664,11 +1675,7 @@ me_alloc(mh, newpm, newvreg, newvseg)
* Free an MMU entry.
*
* Assumes the corresponding pmap is already locked.
* Does NOT flush cache, but does record ref and mod bits.
* The rest of each PTE is discarded.
* CALLER MUST SET CONTEXT to pm->pm_ctxnum (if pmap has
* a context) or to 0 (if not). Caller must also update
* pm->pm_segmap and (possibly) the hardware.
* Caller must update hardware.
*/
void
me_free(pm, pmeg)
@ -1676,11 +1683,12 @@ me_free(pm, pmeg)
u_int pmeg;
{
struct mmuentry *me = &mmusegments[pmeg];
int i, va, tpte;
int vr;
struct regmap *rp;
#ifdef DEBUG
int i, va, tpte, ctx;
#endif
vr = me->me_vreg;
rp = &pm->pm_regmap[me->me_vreg];
#ifdef DEBUG
if (pmapdebug & PDB_MMU_ALLOC)
@ -1690,32 +1698,27 @@ me_free(pm, pmeg)
panic("me_free: wrong mmuentry");
if (pm != me->me_pmap)
panic("me_free: pm != me_pmap");
#endif
if (rp->rg_segmap[me->me_vseg].sg_pmeg != pmeg &&
rp->rg_segmap[me->me_vseg].sg_pmeg != seginval)
panic("me_free: wrong sg_pmeg (%d != %d)",
rp->rg_segmap[me->me_vseg].sg_pmeg, pmeg);
rp = &pm->pm_regmap[vr];
/* just like me_alloc, but no cache flush, and context already set */
if (CTX_USABLE(pm,rp)) {
va = VSTOVA(vr,me->me_vseg);
} else {
#ifdef DEBUG
if (getcontext4() != 0) panic("me_free: ctx != 0");
#endif
if (HASSUN4_MMU3L)
setregmap(0, tregion);
setsegmap(0, me->me_cookie);
va = 0;
}
/* check for spurious mappings (using temp. mapping in context 0) */
ctx = getcontext4();
setcontext4(0);
if (HASSUN4_MMU3L)
setregmap(0, tregion);
setsegmap(0, me->me_cookie);
va = 0;
i = NPTESG;
do {
tpte = getpte4(va);
if ((tpte & (PG_V | PG_TYPE)) == (PG_V | PG_OBMEM)) {
struct vm_page *pg;
if ((pg = pvhead4_4c(tpte)) != NULL)
VM_MDPAGE_PVHEAD(pg)->pv_flags |= MR4_4C(tpte);
}
if ((tpte & PG_V) == PG_V)
panic("me_free: segment not clean (pte=%x)", tpte);
va += NBPG;
} while (--i > 0);
setcontext4(ctx);
#endif /* DEBUG */
/* take mmu entry off pmap chain */
TAILQ_REMOVE(&pm->pm_seglist, me, me_pmchain);