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@@ -0,0 +1,159 @@
+#ifndef CYGONCE_DEVS_WATCHDOG_HXX
+#define CYGONCE_DEVS_WATCHDOG_HXX
+
+//==========================================================================
+//
+//      watchdog.hxx
+//
+//      Watchdog interface declaration
+//
+//==========================================================================
+//####COPYRIGHTBEGIN####
+//                                                                          
+// -------------------------------------------                              
+// The contents of this file are subject to the Red Hat eCos Public License 
+// Version 1.1 (the "License"); you may not use this file except in         
+// compliance with the License.  You may obtain a copy of the License at    
+// http://www.redhat.com/                                                   
+//                                                                          
+// Software distributed under the License is distributed on an "AS IS"      
+// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the 
+// License for the specific language governing rights and limitations under 
+// the License.                                                             
+//                                                                          
+// The Original Code is eCos - Embedded Configurable Operating System,      
+// released September 30, 1998.                                             
+//                                                                          
+// The Initial Developer of the Original Code is Red Hat.                   
+// Portions created by Red Hat are                                          
+// Copyright (C) 1998, 1999, 2000 Red Hat, Inc.                             
+// All Rights Reserved.                                                     
+// -------------------------------------------                              
+//                                                                          
+//####COPYRIGHTEND####
+//==========================================================================
+//#####DESCRIPTIONBEGIN####
+//
+// Author(s):   nickg
+// Contributors:        nickg
+// Date:        1998-07-14
+// Purpose:     Watchdog declarations
+// Description: This file defines the interface to the watchdog device
+//              that provides timer based recovery from software and
+//              hardware faults.
+// Usage:       #include <cyg/devs/watchdog.hxx>
+//
+//####DESCRIPTIONEND####
+//
+//==========================================================================
+
+#include <cyg/kernel/ktypes.h>
+#include <cyg/infra/cyg_ass.h>            // assertion macros
+
+class Cyg_Watchdog_Action;
+
+// -------------------------------------------------------------------------
+// Watchdog class
+
+class Cyg_Watchdog
+{
+
+    Cyg_Watchdog_Action         *action_list;
+
+    cyg_uint64                  resolution;
+    
+public:
+
+    Cyg_Watchdog();
+
+    // Return time interval allowed between resets before watchdog
+    // triggers, in nanoseconds.
+    cyg_uint64 get_resolution( void );
+    
+    // Start the watchdog running.
+    void start( void );
+
+    // Reset watchdog timer. This needs to be called regularly to prevent
+    // the watchdog firing.
+    void reset( void );
+
+#ifndef CYGSEM_WATCHDOG_RESETS_ON_TIMEOUT    
+    // Trigger the watchdog as if the timer had expired.
+    void trigger( void );
+
+    // Register an action routine that will be called when the timer
+    // triggers.
+    void install_action( Cyg_Watchdog_Action *wdaction );
+
+    // Deregister a previously registered action routine.
+    void uninstall_action( Cyg_Watchdog_Action *wdaction );
+#endif
+    
+    // A static instance of the single system defined watchdog device.
+    static Cyg_Watchdog watchdog;
+
+private:
+    void init_hw( void );
+};
+
+#ifndef CYGSEM_WATCHDOG_RESETS_ON_TIMEOUT    
+// -------------------------------------------------------------------------
+// Watchdog action class
+
+class Cyg_Watchdog_Action
+{
+    friend class Cyg_Watchdog;
+
+    Cyg_Watchdog_Action         *next;          // link in chain
+    
+    void (*action)( CYG_ADDRWORD data );        // action function
+
+    CYG_ADDRWORD data;                          // data argument
+    
+public:
+
+    Cyg_Watchdog_Action(
+        void (*action)( CYG_ADDRWORD data ),
+        CYG_ADDRWORD data
+        );
+
+    ~Cyg_Watchdog_Action();
+
+    void install();
+    
+    void uninstall();
+};
+
+// -------------------------------------------------------------------------
+// Cyg_Watchdog_Action inlines
+
+inline Cyg_Watchdog_Action::Cyg_Watchdog_Action(
+    void (*action_arg)( CYG_ADDRWORD data ),
+    CYG_ADDRWORD data_arg
+    )
+{
+    next        = NULL;
+    action      = action_arg;
+    data        = data_arg;
+}
+
+inline Cyg_Watchdog_Action::~Cyg_Watchdog_Action()
+{
+    Cyg_Watchdog::watchdog.uninstall_action( this );
+}
+
+inline void Cyg_Watchdog_Action::install()
+{
+    Cyg_Watchdog::watchdog.install_action( this );    
+}
+
+inline void Cyg_Watchdog_Action::uninstall()
+{
+    Cyg_Watchdog::watchdog.uninstall_action( this );    
+}
+
+#endif // CYGSEM_WATCHDOG_RESETS_ON_TIMEOUT
+
+// -------------------------------------------------------------------------
+#endif // ifndef CYGONCE_DEVS_WATCHDOG_HXX
+// EOF watchdog.hxx