Scheduler and multiple threads

src/kernel/include/proc.h

@@ -5,12 +5,21 @@ struct thread
 {
     struct thread *q_next;
     uint64_t tid;
-    void *stack;
+    void *stack_ptr;
     uint64_t state;
+    uint8_t stack[];
 };
 
+// proc/thread.c
+extern struct thread *current_thread;
+
 // proc/swtch.S
 void *switch_stack(void *out, void *in);
 
 // proc/thread.c
+struct thread *new_thread(void (*function)(void));
+struct thread *thread();
+
+// proc/scheduler.c
+void scheduler_insert(struct thread *new);
 void start_scheduler();