--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/nucleus/iod.c	Fri Oct 16 06:23:26 2020 +0000
@@ -0,0 +1,89 @@
+/*************************************************************************/
+/*                                                                       */
+/*               Copyright Mentor Graphics Corporation 2002              */
+/*                         All Rights Reserved.                          */
+/*                                                                       */
+/* THIS WORK CONTAINS TRADE SECRET AND PROPRIETARY INFORMATION WHICH IS  */
+/* THE PROPERTY OF MENTOR GRAPHICS CORPORATION OR ITS LICENSORS AND IS   */
+/* SUBJECT TO LICENSE TERMS.                                             */
+/*                                                                       */
+/*************************************************************************/
+
+/*************************************************************************/
+/*                                                                       */
+/* FILE NAME                                               VERSION       */
+/*                                                                       */
+/*      iod.c                                          Nucleus PLUS 1.14 */
+/*                                                                       */
+/* COMPONENT                                                             */
+/*                                                                       */
+/*      IO - Input/Output Driver Management                              */
+/*                                                                       */
+/* DESCRIPTION                                                           */
+/*                                                                       */
+/*      This file contains global data structures for use within the     */
+/*      Input/Output Driver Management component.                        */
+/*                                                                       */
+/* DATA STRUCTURES                                                       */
+/*                                                                       */
+/*      IOD_Created_Drivers_List            Pointer to the linked-list   */
+/*                                            of created I/O drivers     */
+/*      IOD_Total_Drivers                   Total number of created      */
+/*                                            I/O drivers                */
+/*      IOD_List_Protect                    I/O driver list protection   */
+/*                                                                       */
+/* FUNCTIONS                                                             */
+/*                                                                       */
+/*      None                                                             */
+/*                                                                       */
+/* DEPENDENCIES                                                          */
+/*                                                                       */
+/*      io_defs.h                           I/O Driver Management consts */
+/*      tc_defs.h                           Thread Control constants     */
+/*                                                                       */
+/* HISTORY                                                               */
+/*                                                                       */
+/*        DATE                    REMARKS                                */
+/*                                                                       */
+/*      03-01-1993      Created initial version 1.0                      */
+/*      04-19-1993      Verified version 1.0                             */
+/*      03-01-1994      Updated copyright notice,                        */
+/*                      resulting in version 1.1                         */
+/*                                                                       */
+/*      03-18-1994      Verified version 1.1                             */
+/*      04-17-1996      updated to version 1.2                           */
+/*      03-24-1998      Released version 1.3                             */
+/*      03-26-1999      Released 1.11m (new release                      */
+/*                        numbering scheme)                              */
+/*      04-17-2002      Released version 1.13m                           */
+/*      11-07-2002      Released version 1.14                            */
+/*************************************************************************/
+#define         NU_SOURCE_FILE
+
+#include        "io_defs.h"                 /* I/O Driver constants      */
+#include        "tc_defs.h"                 /* Thread control constants  */
+
+
+/* IOD_Created_Drivers_List is the head pointer of the linked list of
+   created I/O drivers.  If the list is NU_NULL, there are no I/O drivers
+   created.  */
+
+CS_NODE        *IOD_Created_Drivers_List;
+
+
+/* IOD_Total_Drivers contains the number of currently created
+   I/O drivers.  */
+
+UNSIGNED        IOD_Total_Drivers;
+
+
+/* IOD_List_Protect is a list protection structure used to block any other
+   thread from access to the created drivers list.  */
+
+TC_PROTECT      IOD_List_Protect;
+
+
+
+
+
+