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Implement pmap_clear_modify() and pmap_is_modified()

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This commit is contained in:
reinoud 2011-08-30 10:58:41 +00:00
parent 6661de3650
commit d3eeac5866
1 changed files with 34 additions and 8 deletions
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42
sys/arch/usermode/usermode/pmap.c
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@ -1,4 +1,4 @@
/* $NetBSD: pmap.c,v 1.42 2011/08/30 10:44:06 reinoud Exp $ */
/* $NetBSD: pmap.c,v 1.43 2011/08/30 10:58:41 reinoud Exp $ */
/*-
* Copyright (c) 2011 Reinoud Zandijk <reinoud@NetBSD.org>
@ -27,7 +27,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.42 2011/08/30 10:44:06 reinoud Exp $");
__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.43 2011/08/30 10:58:41 reinoud Exp $");
#include "opt_memsize.h"
#include "opt_kmempages.h"
@ -832,10 +832,29 @@ aprint_debug("pmap_page_protect not implemented\n");
}
bool
pmap_clear_modify(struct vm_page *pg)
pmap_clear_modify(struct vm_page *page)
{
aprint_debug("pmap_clear_modify not implemented\n");
return true;
struct pv_entry *pv;
uintptr_t ppn;
bool rv;
ppn = atop(VM_PAGE_TO_PHYS(page));
rv = pmap_is_modified(page);
aprint_debug("pmap_clear_modify page %"PRIiPTR"\n", ppn);
/* if marked modified, clear it in all the pmap's referencing it */
if (rv) {
/* if its marked modified in a kernel mapping, don't clear it */
for (pv = &pv_table[ppn]; pv != NULL; pv = pv->pv_next)
if (pv->pv_pmap == pmap_kernel() &&
(pv->pv_prot & VM_PROT_WRITE))
return rv;
/* clear it */
pv_table[ppn].pv_pflags &= ~PV_MODIFIED;
pmap_update_page(ppn);
}
return rv;
}
bool
@ -846,10 +865,17 @@ aprint_debug("pmap_clear_reference not implemented\n");
}
bool
pmap_is_modified(struct vm_page *pg)
pmap_is_modified(struct vm_page *page)
{
aprint_debug("pmap_is_modified not implemented\n");
return false;
intptr_t ppn;
bool rv;
ppn = atop(VM_PAGE_TO_PHYS(page));
rv = (pv_table[ppn].pv_pflags & PV_MODIFIED) != 0;
aprint_debug("pmap_is_modified page %"PRIiPTR" : %s\n", ppn, rv?"yes":"no");
return rv;
}
bool