starting to work on pty drivers, fork(), and scheduler redesign

kernel/memory/mm.h

@@ -21,6 +21,7 @@ void* p_alloc_frame();
 uint32_t total_free_memory();
 
 void* create_task_pd();
+void* clone_task_pd();
 
 void map_page(uint32_t vaddr, uint32_t paddr, uint32_t flags);