Start on XHCI struct

src/hulk/pci.d

@@ -5,6 +5,7 @@ import hulk.klog;
 import hulk.hurl;
 import hulk.hurl.a1;
 import hulk.range;
+import hulk.usb.xhci;
 
 struct Pci
 {
@@ -125,6 +126,35 @@ struct Pci
                 }
             }
         }
+
+        private void spawn_device_instance()
+        {
+            switch (class_id)
+            {
+            case SerialBusController.ID:
+                switch (subclass_id)
+                {
+                case SerialBusController.USBController.ID:
+                    switch (if_id)
+                    {
+                    case SerialBusController.USBController.XHCIController.ID:
+                        XHCI.build(&this);
+                        break;
+
+                    default:
+                        break;
+                    }
+                    break;
+
+                default:
+                    break;
+                }
+                break;
+
+            default:
+                break;
+            }
+        }
     }
 
     struct SerialBusController