kernel: implement globally-unique object ids

kernel/object.c

@@ -7,6 +7,20 @@
 static struct queue object_types;
 static spin_lock_t object_types_lock = SPIN_LOCK_INIT;
 
+static koid_t koid_alloc(void)
+{
+	static koid_t counter = 0;
+	static spin_lock_t lock = SPIN_LOCK_INIT;
+
+	unsigned long flags;
+	spin_lock_irqsave(&lock, &flags);
+	koid_t result = counter;
+	counter++;
+	spin_unlock_irqrestore(&lock, flags);
+
+	return result;
+}
+
 kern_status_t object_bootstrap(void)
 {
 	return KERN_OK;
@@ -53,6 +67,7 @@ struct object *object_create(struct object_type *type)
 	struct object *obj = (struct object *)((unsigned char *)obj_buf
 	                                       + type->ob_header_offset);
 
+	obj->ob_id = koid_alloc();
 	obj->ob_type = type;
 	obj->ob_lock = SPIN_LOCK_INIT;
 	obj->ob_magic = OBJECT_MAGIC;