kernel/vm/vm.cpp

4713 	Returns \c B_OK with \c context.restart set to \c true, if the functions
4716 	Returns \c B_OK with \c context.restart set to \c false, if the page was
4717 	found. It is returned in \c context.page. The address space will still be
4722 fault_get_page(PageFaultContext& context)
4724 	VMCache* cache = context.topCache;
4733 		page = cache->LookupPage(context.cacheOffset);
4736 			context.UnlockAll(cache);
4741 			context.restart = true;
4751 		if (cache->HasPage(context.cacheOffset)) {
4753 			page = vm_page_allocate_page(&context.reservation,
4755 			cache->InsertPage(page, context.cacheOffset);
4760 			context.UnlockAll();
4767 			status_t status = cache->Read(context.cacheOffset, &vec, 1,
4794 			context.restart = true;
4798 		cache = context.cacheChainLocker.LockSourceCache();
4805 		cache = context.isWrite ? context.topCache : lastCache;
4808 		page = vm_page_allocate_page(&context.reservation,
4814 		cache->InsertPage(page, context.cacheOffset);
4815 		context.pageAllocated = true;
4816 	} else if (page->Cache() != context.topCache && context.isWrite) {
4824 		page = vm_page_allocate_page(&context.reservation, PAGE_STATE_ACTIVE);
4830 		context.cacheChainLocker.UnlockKeepRefs(true);
4836 		context.cacheChainLocker.RelockCaches(true);
4840 		context.topCache->InsertPage(page, context.cacheOffset);
4841 		context.pageAllocated = true;
4845 	context.page = page;
4869 	PageFaultContext context(addressSpace, isWrite);
4879 	size_t reservePages = 2 + context.map->MaxPagesNeededToMap(originalAddress,
4881 	context.addressSpaceLocker.Unlock();
4882 	vm_page_reserve_pages(&context.reservation, reservePages,
4887 		context.addressSpaceLocker.Lock();
4941 		context.Prepare(vm_area_get_locked_cache(area),
4950 			status = context.topCache->Fault(addressSpace, context.cacheOffset);
4958 		status = fault_get_page(context);
4964 		if (context.restart)
4969 		TPF(PageFaultDone(area->id, context.topCache, context.page->Cache(),
4970 			context.page));
4976 		if (context.page->Cache() != context.topCache && !isWrite)
4983 		context.map->Lock();
4988 		if (context.map->Query(address, &physicalAddress, &flags) == B_OK
4994 			if (mappedPage == context.page) {
4995 				context.map->ProtectPage(area, address, newProtection);
5004 		context.map->Unlock();
5017 				if (context.pageAllocated) {
5022 					context.topCache->RemovePage(context.page);
5023 					vm_page_free_etc(context.topCache, context.page,
5024 						&context.reservation);
5026 					DEBUG_PAGE_ACCESS_END(context.page);
5028 				context.UnlockAll();
5048 			if (map_page(area, context.page, address, newProtection,
5049 					&context.reservation) != B_OK) {
5056 				DEBUG_PAGE_ACCESS_END(context.page);
5058 				context.UnlockAll();
5074 		} else if (context.page->State() == PAGE_STATE_INACTIVE)
5075 			vm_page_set_state(context.page, PAGE_STATE_ACTIVE);
5079 			increment_page_wired_count(context.page);
5080 			*wirePage = context.page;
5083 		DEBUG_PAGE_ACCESS_END(context.page);