* Copyright 2010, Ingo Weinhold, ingo_weinhold@gmx.de.
* Distributed under the terms of the MIT License.
*/
#include <vm/VMTranslationMap.h>
#include <vm/vm_page.h>
#include <vm/vm_priv.h>
#include <vm/VMArea.h>
VMTranslationMap::VMTranslationMap()
:
fMapCount(0)
{
recursive_lock_init(&fLock, "translation map");
}
VMTranslationMap::~VMTranslationMap()
{
recursive_lock_destroy(&fLock);
}
The default implementation just iterates over all virtual pages of the
range and calls UnmapPage(). This is obviously not particularly efficient.
*/
void
VMTranslationMap::UnmapPages(VMArea* area, addr_t base, size_t size,
bool updatePageQueue)
{
ASSERT(base % B_PAGE_SIZE == 0);
ASSERT(size % B_PAGE_SIZE == 0);
addr_t address = base;
addr_t end = address + size;
#if DEBUG_PAGE_ACCESS
for (; address != end; address += B_PAGE_SIZE) {
addr_t physicalAddress;
uint32 flags;
if (Query(address, &physicalAddress, &flags) == B_OK
&& (flags & PAGE_PRESENT) == 0) {
vm_page* page = vm_lookup_page(physicalAddress / B_PAGE_SIZE);
if (page != NULL) {
DEBUG_PAGE_ACCESS_START(page);
UnmapPage(area, address, updatePageQueue);
DEBUG_PAGE_ACCESS_END(page);
} else
UnmapPage(area, address, updatePageQueue);
}
}
#else
for (; address != end; address += B_PAGE_SIZE)
UnmapPage(area, address, updatePageQueue);
#endif
}
If \a deletingAddressSpace is \c true, the address space the area belongs to
is in the process of being destroyed and isn't used by anyone anymore. For
some architectures this can be used for optimizations (e.g. not unmapping
pages or at least not needing to invalidate TLB entries).
If \a ignoreTopCachePageFlags is \c true, the area is in the process of
being destroyed and its top cache is otherwise unreferenced. I.e. all mapped
pages that live in the top cache area going to be freed and the page
accessed and modified flags don't need to be propagated.
The default implementation just iterates over all virtual pages of the
area and calls UnmapPage(). This is obviously not particularly efficient.
*/
void
VMTranslationMap::UnmapArea(VMArea* area, bool deletingAddressSpace,
bool ignoreTopCachePageFlags)
{
addr_t address = area->Base();
addr_t end = address + area->Size();
#if DEBUG_PAGE_ACCESS
for (; address != end; address += B_PAGE_SIZE) {
addr_t physicalAddress;
uint32 flags;
if (Query(address, &physicalAddress, &flags) == B_OK
&& (flags & PAGE_PRESENT) == 0) {
vm_page* page = vm_lookup_page(physicalAddress / B_PAGE_SIZE);
if (page != NULL) {
DEBUG_PAGE_ACCESS_START(page);
UnmapPage(area, address, true);
DEBUG_PAGE_ACCESS_END(page);
} else
UnmapPage(area, address, true);
}
}
#else
for (; address != end; address += B_PAGE_SIZE)
UnmapPage(area, address, true);
#endif
}
VMPhysicalPageMapper::VMPhysicalPageMapper()
{
}
VMPhysicalPageMapper::~VMPhysicalPageMapper()
{
}
