void
ARMVMTranslationMap32Bit::UnmapPages(VMArea* area, addr_t base, size_t size,
bool updatePageQueue)
{
if (size == 0)
return;
addr_t start = base;
addr_t end = base + size - 1;
TRACE("ARMVMTranslationMap32Bit::UnmapPages(%p, %#" B_PRIxADDR ", %#"
B_PRIxADDR ")\n", area, start, end);
page_directory_entry* pd = fPagingStructures->pgdir_virt;
VMAreaMappings queue;
RecursiveLocker locker(fLock);
do {
int index = VADDR_TO_PDENT(start);
if ((pd[index] & ARM_PDE_TYPE_MASK) == 0) {
// no page table here, move the start up to access the next page
// table
start = ROUNDUP(start + 1, kPageTableAlignment);
continue;
}
Thread* thread = thread_get_current_thread();
ThreadCPUPinner pinner(thread);
page_table_entry* pt = (page_table_entry*)fPageMapper->GetPageTableAt(
pd[index] & ARM_PDE_ADDRESS_MASK);
for (index = VADDR_TO_PTENT(start); (index < 1024) && (start < end);
index++, start += B_PAGE_SIZE) {
page_table_entry oldEntry
= ARMPagingMethod32Bit::ClearPageTableEntry(&pt[index]);
if ((oldEntry & ARM_PTE_TYPE_MASK) == 0)
continue;
fMapCount--;
if (true /*(oldEntry & ARM_PTE_ACCESSED) != 0*/) { // XXX IRA
// Note, that we only need to invalidate the address, if the
// accessed flags was set, since only then the entry could have
// been in any TLB.
InvalidatePage(start);
}
if (area->cache_type != CACHE_TYPE_DEVICE) {
// get the page
vm_page* page = vm_lookup_page(
(oldEntry & ARM_PTE_ADDRESS_MASK) / B_PAGE_SIZE);
ASSERT(page != NULL);
DEBUG_PAGE_ACCESS_START(page);
// transfer the accessed/dirty flags to the page
if (/*(oldEntry & ARM_PTE_ACCESSED) != 0*/ true) // XXX IRA
page->accessed = true;
if (/*(oldEntry & ARM_PTE_DIRTY) != 0 */ true)
page->modified = true;
// remove the mapping object/decrement the wired_count of the
// page
if (area->wiring == B_NO_LOCK) {
vm_page_mapping* mapping = NULL;
vm_page_mappings::Iterator iterator
= page->mappings.GetIterator();
while ((mapping = iterator.Next()) != NULL) {
if (mapping->area == area)
break;
}
ASSERT(mapping != NULL);
area->mappings.Remove(mapping);
page->mappings.Remove(mapping);
queue.Add(mapping);
} else
page->DecrementWiredCount();
if (!page->IsMapped()) {
atomic_add(&gMappedPagesCount, -1);
if (updatePageQueue) {
if (page->Cache()->temporary)
vm_page_set_state(page, PAGE_STATE_INACTIVE);
else if (page->modified)
vm_page_set_state(page, PAGE_STATE_MODIFIED);
else
vm_page_set_state(page, PAGE_STATE_CACHED);
}
}
DEBUG_PAGE_ACCESS_END(page);
}
}
Flush();
// flush explicitly, since we directly use the lock
} while (start != 0 && start < end);
// TODO: As in UnmapPage() we can lose page dirty flags here. ATM it's not
// really critical here, as in all cases this method is used, the unmapped
// area range is unmapped for good (resized/cut) and the pages will likely
// be freed.
locker.Unlock();
// free removed mappings
bool isKernelSpace = area->address_space == VMAddressSpace::Kernel();
uint32 freeFlags = CACHE_DONT_WAIT_FOR_MEMORY
| (isKernelSpace ? CACHE_DONT_LOCK_KERNEL_SPACE : 0);
while (vm_page_mapping* mapping = queue.RemoveHead())
object_cache_free(gPageMappingsObjectCache, mapping, freeFlags);
}
void
X86VMTranslationMap64Bit::UnmapPages(VMArea* area, addr_t base, size_t size,
bool updatePageQueue)
{
if (size == 0)
return;
addr_t start = base;
addr_t end = base + size - 1;
TRACE("X86VMTranslationMap64Bit::UnmapPages(%p, %#" B_PRIxADDR ", %#"
B_PRIxADDR ")\n", area, start, end);
VMAreaMappings queue;
RecursiveLocker locker(fLock);
ThreadCPUPinner pinner(thread_get_current_thread());
do {
uint64* pageTable = X86PagingMethod64Bit::PageTableForAddress(
fPagingStructures->VirtualPML4(), start, fIsKernelMap, false,
NULL, fPageMapper, fMapCount);
if (pageTable == NULL) {
// Move on to the next page table.
start = ROUNDUP(start + 1, k64BitPageTableRange);
continue;
}
for (uint32 index = start / B_PAGE_SIZE % k64BitTableEntryCount;
index < k64BitTableEntryCount && start < end;
index++, start += B_PAGE_SIZE) {
uint64 oldEntry = X86PagingMethod64Bit::ClearTableEntry(
&pageTable[index]);
if ((oldEntry & X86_64_PTE_PRESENT) == 0)
continue;
fMapCount--;
if ((oldEntry & X86_64_PTE_ACCESSED) != 0) {
// Note, that we only need to invalidate the address, if the
// accessed flags was set, since only then the entry could have
// been in any TLB.
InvalidatePage(start);
}
if (area->cache_type != CACHE_TYPE_DEVICE) {
// get the page
vm_page* page = vm_lookup_page(
(oldEntry & X86_64_PTE_ADDRESS_MASK) / B_PAGE_SIZE);
ASSERT(page != NULL);
DEBUG_PAGE_ACCESS_START(page);
// transfer the accessed/dirty flags to the page
if ((oldEntry & X86_64_PTE_ACCESSED) != 0)
page->accessed = true;
if ((oldEntry & X86_64_PTE_DIRTY) != 0)
page->modified = true;
// remove the mapping object/decrement the wired_count of the
// page
if (area->wiring == B_NO_LOCK) {
vm_page_mapping* mapping = NULL;
vm_page_mappings::Iterator iterator
= page->mappings.GetIterator();
while ((mapping = iterator.Next()) != NULL) {
if (mapping->area == area)
break;
}
ASSERT(mapping != NULL);
area->mappings.Remove(mapping);
page->mappings.Remove(mapping);
queue.Add(mapping);
} else
page->DecrementWiredCount();
if (!page->IsMapped()) {
atomic_add(&gMappedPagesCount, -1);
if (updatePageQueue) {
if (page->Cache()->temporary)
vm_page_set_state(page, PAGE_STATE_INACTIVE);
else if (page->modified)
vm_page_set_state(page, PAGE_STATE_MODIFIED);
else
vm_page_set_state(page, PAGE_STATE_CACHED);
}
}
DEBUG_PAGE_ACCESS_END(page);
}
}
Flush();
// flush explicitly, since we directly use the lock
} while (start != 0 && start < end);
// TODO: As in UnmapPage() we can lose page dirty flags here. ATM it's not
// really critical here, as in all cases this method is used, the unmapped
// area range is unmapped for good (resized/cut) and the pages will likely
// be freed.
locker.Unlock();
// free removed mappings
bool isKernelSpace = area->address_space == VMAddressSpace::Kernel();
uint32 freeFlags = CACHE_DONT_WAIT_FOR_MEMORY
| (isKernelSpace ? CACHE_DONT_LOCK_KERNEL_SPACE : 0);
while (vm_page_mapping* mapping = queue.RemoveHead())
object_cache_free(gPageMappingsObjectCache, mapping, freeFlags);
}