kernel: add initial object manager definitions

obj/object.c

@@ -0,0 +1,109 @@
+#include <socks/object.h>
+#include <socks/queue.h>
+#include <socks/locks.h>
+
+#define HAS_OP(obj, opname) ((obj)->ob_type->ob_ops && (obj)->ob_type->ob_ops->opname)
+
+static queue_t object_types;
+static spin_lock_t object_types_lock = SPIN_LOCK_INIT;
+
+kern_status_t object_bootstrap(void)
+{
+	init_set_objects();
+	init_global_namespace();
+	return KERN_OK;
+}
+
+kern_status_t object_type_register(object_type_t *p)
+{
+	unsigned long flags;
+	spin_lock_irqsave(&object_types_lock, &flags);
+	queue_push_back(&object_types, &p->ob_list);
+	spin_unlock_irqrestore(&object_types_lock, flags);
+
+	p->ob_cache.c_name = p->ob_name;
+	p->ob_cache.c_obj_size = sizeof(object_t) + p->ob_size;
+	p->ob_cache.c_page_order = VM_PAGE_16K;
+	
+	vm_cache_init(&p->ob_cache);
+	p->ob_flags |= OBJTYPE_INIT;
+	
+	return KERN_OK;
+}
+
+kern_status_t object_type_unregister(object_type_t *p)
+{
+	unsigned long flags;
+	spin_lock_irqsave(&object_types_lock, &flags);
+	queue_delete(&object_types, &p->ob_list);
+	spin_unlock_irqrestore(&object_types_lock, flags);
+
+	return KERN_OK;
+}
+
+object_t *object_create(object_type_t *type)
+{
+	if (!(type->ob_flags & OBJTYPE_INIT)) {
+		return NULL;
+	}
+	
+	vm_cache_t *cache = &type->ob_cache;
+	object_t *obj = vm_cache_alloc(cache, 0);
+	if (!obj) {
+		return NULL;
+	}
+
+	obj->ob_lock = SPIN_LOCK_INIT;
+	obj->ob_magic = OBJECT_MAGIC;
+	obj->ob_refcount = 1;
+	obj->ob_handles = 0;
+	
+	return obj;
+}
+
+object_t *object_ref(object_t *obj)
+{
+	obj->ob_refcount++;
+	return obj;
+}
+
+void object_deref(object_t *obj)
+{
+	unsigned long flags;
+	spin_lock_irqsave(&obj->ob_lock, &flags);
+	
+	if (obj->ob_refcount == 0) {
+		spin_unlock_irqrestore(&obj->ob_lock, flags);
+		return;
+	}
+
+	obj->ob_refcount--;
+
+	if (obj->ob_refcount > 0) {
+		spin_unlock_irqrestore(&obj->ob_lock, flags);
+		return;
+	}
+
+	if (HAS_OP(obj, delete)) {
+		obj->ob_type->ob_ops->delete(obj);
+	}
+
+	vm_cache_free(&obj->ob_type->ob_cache, obj);
+
+	spin_unlock_irqrestore(&obj->ob_lock, flags);
+}
+
+void *object_data(object_t *obj)
+{
+	return (char *)obj + sizeof *obj;
+}
+
+object_t *object_header(void *p)
+{
+	object_t *obj = (object_t *)((char *)p - sizeof *obj);
+	if (obj->ob_magic != OBJECT_MAGIC) {
+		return NULL;
+	}
+
+	return obj;
+}