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Update pmap_clearbit to flush the cache if the area is being made readonly. Also only do this and the tlb flush if the pmap is the current pmap.

This commit is contained in:
chris 2001-09-13 22:45:23 +00:00
parent 6813f628ef
commit 5695ad388d
1 changed files with 42 additions and 6 deletions
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48
sys/arch/arm/arm32/pmap.c
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@ -1,4 +1,4 @@
/* $NetBSD: pmap.c,v 1.20 2001/09/10 23:40:02 chris Exp $ */
/* $NetBSD: pmap.c,v 1.21 2001/09/13 22:45:23 chris Exp $ */
/*
* Copyright (c) 2001 Richard Earnshaw
@ -142,7 +142,7 @@
#include <machine/param.h>
#include <machine/katelib.h>
__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.20 2001/09/10 23:40:02 chris Exp $");
__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.21 2001/09/13 22:45:23 chris Exp $");
#ifdef PMAP_DEBUG
#define PDEBUG(_lev_,_stat_) \
if (pmap_debug_level >= (_lev_)) \
@ -1770,6 +1770,7 @@ pmap_clean_page(pv, is_src)
/* This doesn't work, because pmap_protect
doesn't flush changes on pages that it
has write-protected. */
/* If the page is not writeable and this
is the source, then there is no need
to flush it from the cache. */
@ -3161,10 +3162,13 @@ pmap_clearbit(pa, maskbits)
struct pv_head *pvh;
pt_entry_t *pte;
vaddr_t va;
int bank, off;
int bank, off, tlbentry;
PDEBUG(1, printf("pmap_clearbit: pa=%08lx mask=%08x\n",
pa, maskbits));
tlbentry = 0;
if ((bank = vm_physseg_find(atop(pa), &off)) == -1)
return;
PMAP_HEAD_TO_MAP_LOCK();
@ -3200,14 +3204,46 @@ pmap_clearbit(pa, maskbits)
pte = pmap_pte(pv->pv_pmap, va);
KASSERT(pte != NULL);
if (maskbits & (PT_Wr|PT_M))
*pte &= ~PT_AP(AP_W);
{
if ((pv->pv_flags & PT_NC))
{
/*
* entry is not cacheable, so reenable the cache,
* nothing to flush
*/
*pte |= (PT_C | PT_B);
pv->pv_flags &= ~PT_NC;
} else {
/*
* entry is cacheable check if pmap is current if it
* is flush it, otherwise it won't be in the cache
*/
if (pmap_is_curpmap(pv->pv_pmap))
{
/* entry is in current pmap purge it */
cpu_cache_purgeID_rng(pv->pv_va, NBPG);
}
}
/* make the pte read only */
*pte &= ~PT_AP(AP_W);
if (pmap_is_curpmap(pv->pv_pmap))
/*
* if we had cacheable pte's we'd clean the pte out to
* memory here
*/
/*
* flush tlb entry as it's in the current pmap
*/
cpu_tlb_flushID_SE(pv->pv_va);
}
if (maskbits & PT_H)
*pte = (*pte & ~L2_MASK) | L2_INVAL;
}
simple_unlock(&pvh->pvh_lock);
PMAP_HEAD_TO_MAP_UNLOCK();
cpu_tlb_flushID();
}