--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/nucleus/hid.c	Fri May 15 01:28:16 2020 +0000
@@ -0,0 +1,99 @@
+/*************************************************************************/
+/*                                                                       */
+/*               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       */
+/*                                                                       */
+/*      hid.c                                          Nucleus PLUS 1.14 */
+/*                                                                       */
+/* COMPONENT                                                             */
+/*                                                                       */
+/*      HI - History Management                                          */
+/*                                                                       */
+/* DESCRIPTION                                                           */
+/*                                                                       */
+/*      This file contains global data structures for use within the     */
+/*      History Management component.                                    */
+/*                                                                       */
+/* DATA STRUCTURES                                                       */
+/*                                                                       */
+/*      HID_History_Enable                  History saving enabled flag  */
+/*      HID_Write_Index                     Current write index into     */
+/*                                            history table              */
+/*      HID_Read_Index                      Current read index into      */
+/*                                            history table              */
+/*      HID_Entry_Count                     Number of entries in the     */
+/*                                            table counter              */
+/*      HID_History_Protect                 History protection           */
+/*                                                                       */
+/* FUNCTIONS                                                             */
+/*                                                                       */
+/*      None                                                             */
+/*                                                                       */
+/* DEPENDENCIES                                                          */
+/*                                                                       */
+/*      hi_defs.h                           History Management 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        "hi_defs.h"                 /* History constants         */
+
+
+/* HID_History_Enable is a flag that indicates whether or not history saving
+   is enabled.  If this value is NU_FALSE, history saving is disabled.
+   Otherwise, history saving is enabled.  */
+
+INT     HID_History_Enable;
+
+
+/* HID_Write_Index is the index of the next available entry in the history
+   table.  */
+
+INT     HID_Write_Index;
+
+
+/* HID_Read_Index is the index of the oldest entry in the history table.  */
+
+INT     HID_Read_Index;
+
+
+/* HID_Entry_Count keeps track of the number of entries currently
+   in the history table.  */
+
+INT     HID_Entry_Count;
+
+
+/* HID_History_Protect is a protection structure used to block any other
+   thread from access to the history data structures.  */
+
+TC_PROTECT      HID_History_Protect;
+
+
+
+