void
ARMVMTranslationMap32Bit::UnmapArea(VMArea* area, bool deletingAddressSpace,
bool ignoreTopCachePageFlags)
{
if (area->cache_type == CACHE_TYPE_DEVICE || area->wiring != B_NO_LOCK) {
ARMVMTranslationMap32Bit::UnmapPages(area, area->Base(), area->Size(),
true);
return;
}
bool unmapPages = !deletingAddressSpace || !ignoreTopCachePageFlags;
page_directory_entry* pd = fPagingStructures->pgdir_virt;
RecursiveLocker locker(fLock);
VMAreaMappings mappings;
mappings.MoveFrom(&area->mappings);
for (VMAreaMappings::Iterator it = mappings.GetIterator();
vm_page_mapping* mapping = it.Next();) {
vm_page* page = mapping->page;
page->mappings.Remove(mapping);
VMCache* cache = page->Cache();
bool pageFullyUnmapped = false;
if (!page->IsMapped()) {
atomic_add(&gMappedPagesCount, -1);
pageFullyUnmapped = true;
}
if (unmapPages || cache != area->cache) {
addr_t address = area->Base()
+ ((page->cache_offset * B_PAGE_SIZE) - area->cache_offset);
int index = VADDR_TO_PDENT(address);
if ((pd[index] & ARM_PDE_TYPE_MASK) == 0) {
panic("page %p has mapping for area %p (%#" B_PRIxADDR "), but "
"has no page dir entry", page, area, address);
continue;
}
ThreadCPUPinner pinner(thread_get_current_thread());
page_table_entry* pt
= (page_table_entry*)fPageMapper->GetPageTableAt(
pd[index] & ARM_PDE_ADDRESS_MASK);
page_table_entry oldEntry
= ARMPagingMethod32Bit::ClearPageTableEntry(
&pt[VADDR_TO_PTENT(address)]);
pinner.Unlock();
if ((oldEntry & ARM_PTE_TYPE_MASK) == 0) {
panic("page %p has mapping for area %p (%#" B_PRIxADDR "), but "
"has no page table entry", page, area, address);
continue;
}
// transfer the accessed/dirty flags to the page and invalidate
// the mapping, if necessary
if (true /*(oldEntry & ARM_PTE_ACCESSED) != 0*/) { // XXX IRA
page->accessed = true;
if (!deletingAddressSpace)
InvalidatePage(address);
}
if (true /*(oldEntry & ARM_PTE_DIRTY) != 0*/)
page->modified = true;
if (pageFullyUnmapped) {
DEBUG_PAGE_ACCESS_START(page);
if (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);
}
}
fMapCount--;
}
Flush();
// flush explicitely, since we directly use the lock
locker.Unlock();
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 = mappings.RemoveHead())
object_cache_free(gPageMappingsObjectCache, mapping, freeFlags);
}
void
X86VMTranslationMap64Bit::UnmapArea(VMArea* area, bool deletingAddressSpace,
bool ignoreTopCachePageFlags)
{
TRACE("X86VMTranslationMap64Bit::UnmapArea(%p)\n", area);
if (area->cache_type == CACHE_TYPE_DEVICE || area->wiring != B_NO_LOCK) {
X86VMTranslationMap64Bit::UnmapPages(area, area->Base(), area->Size(),
true);
return;
}
bool unmapPages = !deletingAddressSpace || !ignoreTopCachePageFlags;
RecursiveLocker locker(fLock);
ThreadCPUPinner pinner(thread_get_current_thread());
VMAreaMappings mappings;
mappings.MoveFrom(&area->mappings);
for (VMAreaMappings::Iterator it = mappings.GetIterator();
vm_page_mapping* mapping = it.Next();) {
vm_page* page = mapping->page;
page->mappings.Remove(mapping);
VMCache* cache = page->Cache();
bool pageFullyUnmapped = false;
if (!page->IsMapped()) {
atomic_add(&gMappedPagesCount, -1);
pageFullyUnmapped = true;
}
if (unmapPages || cache != area->cache) {
addr_t address = area->Base()
+ ((page->cache_offset * B_PAGE_SIZE) - area->cache_offset);
uint64* entry = X86PagingMethod64Bit::PageTableEntryForAddress(
fPagingStructures->VirtualPML4(), address, fIsKernelMap,
false, NULL, fPageMapper, fMapCount);
if (entry == NULL) {
panic("page %p has mapping for area %p (%#" B_PRIxADDR "), but "
"has no page table", page, area, address);
continue;
}
uint64 oldEntry = X86PagingMethod64Bit::ClearTableEntry(entry);
if ((oldEntry & X86_64_PTE_PRESENT) == 0) {
panic("page %p has mapping for area %p (%#" B_PRIxADDR "), but "
"has no page table entry", page, area, address);
continue;
}
// transfer the accessed/dirty flags to the page and invalidate
// the mapping, if necessary
if ((oldEntry & X86_64_PTE_ACCESSED) != 0) {
page->accessed = true;
if (!deletingAddressSpace)
InvalidatePage(address);
}
if ((oldEntry & X86_64_PTE_DIRTY) != 0)
page->modified = true;
if (pageFullyUnmapped) {
DEBUG_PAGE_ACCESS_START(page);
if (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);
}
}
fMapCount--;
}
Flush();
// flush explicitely, since we directly use the lock
locker.Unlock();
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 = mappings.RemoveHead())
object_cache_free(gPageMappingsObjectCache, mapping, freeFlags);
}
