Index: uspace/lib/drv/generic/remote_usbhc.c
===================================================================
--- uspace/lib/drv/generic/remote_usbhc.c	(revision 7dfc06fa1782dda3da24feb0e244e9bfadcc016e)
+++ uspace/lib/drv/generic/remote_usbhc.c	(revision 2ad98fd4dfa51ea9b7bd803a6936edde014786ae)
@@ -533,21 +533,32 @@
 	}
 
-#define INIT_FROM_HIGH_DATA(type, var, arg_no) \
-	type var = (type) DEV_IPC_GET_ARG##arg_no(*call) / 256
-#define INIT_FROM_LOW_DATA(type, var, arg_no) \
-	type var = (type) DEV_IPC_GET_ARG##arg_no(*call) % 256
-
-	INIT_FROM_HIGH_DATA(usb_address_t, address, 1);
-	INIT_FROM_LOW_DATA(usb_endpoint_t, endpoint, 1);
-	INIT_FROM_HIGH_DATA(usb_transfer_type_t, transfer_type, 2);
-	INIT_FROM_LOW_DATA(usb_direction_t, direction, 2);
-
-#undef INIT_FROM_HIGH_DATA
-#undef INIT_FROM_LOW_DATA
-
-	size_t max_packet_size = (size_t) DEV_IPC_GET_ARG3(*call);
-	unsigned int interval  = (unsigned int) DEV_IPC_GET_ARG4(*call);
-
-	int rc = usb_iface->register_endpoint(fun, address, endpoint,
+#define _INIT_FROM_HIGH_DATA2(type, var, arg_no) \
+	type var = (type) DEV_IPC_GET_ARG##arg_no(*call) / (1 << 16)
+#define _INIT_FROM_LOW_DATA2(type, var, arg_no) \
+	type var = (type) DEV_IPC_GET_ARG##arg_no(*call) % (1 << 16)
+#define _INIT_FROM_HIGH_DATA3(type, var, arg_no) \
+	type var = (type) DEV_IPC_GET_ARG##arg_no(*call) / (1 << 16)
+#define _INIT_FROM_MIDDLE_DATA3(type, var, arg_no) \
+	type var = (type) (DEV_IPC_GET_ARG##arg_no(*call) / (1 << 8)) % (1 << 8)
+#define _INIT_FROM_LOW_DATA3(type, var, arg_no) \
+	type var = (type) DEV_IPC_GET_ARG##arg_no(*call) % (1 << 8)
+
+	_INIT_FROM_HIGH_DATA2(usb_address_t, address, 1);
+	_INIT_FROM_LOW_DATA2(usb_endpoint_t, endpoint, 1);
+
+	_INIT_FROM_HIGH_DATA3(usb_speed_t, speed, 2);
+	_INIT_FROM_MIDDLE_DATA3(usb_transfer_type_t, transfer_type, 2);
+	_INIT_FROM_LOW_DATA3(usb_direction_t, direction, 2);
+
+	_INIT_FROM_HIGH_DATA2(size_t, max_packet_size, 3);
+	_INIT_FROM_LOW_DATA2(unsigned int, interval, 3);
+
+#undef _INIT_FROM_HIGH_DATA2
+#undef _INIT_FROM_LOW_DATA2
+#undef _INIT_FROM_HIGH_DATA3
+#undef _INIT_FROM_MIDDLE_DATA3
+#undef _INIT_FROM_LOW_DATA3
+
+	int rc = usb_iface->register_endpoint(fun, address, speed, endpoint,
 	    transfer_type, direction, max_packet_size, interval);