Function CheckUsermodePointer

Kernel/src/arch/x86_64/paging.cpp:218–238

	}

	bool CheckUsermodePointer(uintptr_t addr, uint64_t len, address_space_t* addressSpace){
		if(addr >> 48) return 0; // Non-canonical or higher-half address

		if(!(addressSpace->pageDirs[PDPT_GET_INDEX(addr)][PAGE_DIR_GET_INDEX(addr)] & (PAGE_PRESENT))){
			return 0;
		}
		
		if(!(addressSpace->pageDirs[PDPT_GET_INDEX(addr + len)][PAGE_DIR_GET_INDEX(addr + len)] & (PAGE_PRESENT))){
			return 0;
		}

		if(!((addressSpace->pageTables[PDPT_GET_INDEX(addr)][PAGE_DIR_GET_INDEX(addr)][PAGE_TABLE_GET_INDEX(addr)] & (PAGE_PRESENT)) && addressSpace->pageTables[PDPT_GET_INDEX(addr)][PAGE_DIR_GET_INDEX(addr)][PAGE_TABLE_GET_INDEX(addr)] & (PAGE_USER))){
			return 0;
		}
		
		if(!((addressSpace->pageTables[PDPT_GET_INDEX(addr + len)][PAGE_DIR_GET_INDEX(addr + len)][PAGE_TABLE_GET_INDEX(addr + len)] & (PAGE_PRESENT)) && addressSpace->pageTables[PDPT_GET_INDEX(addr + len)][PAGE_DIR_GET_INDEX(addr + len)][PAGE_TABLE_GET_INDEX(addr + len)] & (PAGE_USER))){
			return 0;
		}

		return 1;
	}

	page_table_t AllocatePageTable(){
		void* virt = KernelAllocate4KPages(1);