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@@ -0,0 +1,113 @@
+//==========================================================================
+//
+//      devs/wallclock/emulate.cxx
+//
+//      Wallclock emulation implementation
+//
+//==========================================================================
+//####COPYRIGHTBEGIN####
+//
+// -------------------------------------------
+// The contents of this file are subject to the Cygnus eCos Public License
+// Version 1.0 (the "License"); you may not use this file except in
+// compliance with the License.  You may obtain a copy of the License at
+// http://sourceware.cygnus.com/ecos
+// 
+// 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 Cygnus Operating System, released
+// September 30, 1998.
+// 
+// The Initial Developer of the Original Code is Cygnus.  Portions created
+// by Cygnus are Copyright (C) 1998 Cygnus Solutions.  All Rights Reserved.
+// -------------------------------------------
+//
+//####COPYRIGHTEND####
+//==========================================================================
+//#####DESCRIPTIONBEGIN####
+//
+// Author(s):   nickg
+// Contributors:  nickg
+// Date:        1998-07-14
+// Purpose:     Wallclock emulation
+//
+//####DESCRIPTIONEND####
+//
+//==========================================================================
+
+#include <pkgconf/wallclock.h>  // Wallclock device config
+
+#include <cyg/infra/cyg_type.h> // Common type definitions and support
+#include <cyg/hal/hal_diag.h>   // HAL diagnostic output
+
+#include <cyg/devs/wallclock.hxx>
+
+#include <cyg/kernel/sched.hxx>
+#include <cyg/kernel/clock.hxx>
+
+#include <cyg/kernel/sched.inl>
+
+#ifdef CYGIMP_WALLCLOCK_EMULATE
+
+/*---------------------------------------------------------------------------*/
+// Local static variables
+
+static Cyg_WallClock wallclock_instance CYG_INIT_PRIORITY( CLOCK );
+
+static cyg_tick_count epoch_ticks;
+
+static cyg_uint32 epoch_time_stamp;
+
+Cyg_WallClock *Cyg_WallClock::wallclock;
+
+/*---------------------------------------------------------------------------*/
+// Constructor
+
+Cyg_WallClock::Cyg_WallClock()
+{
+    // install instance pointer
+    wallclock = &wallclock_instance;
+}
+
+/*---------------------------------------------------------------------------*/
+// Returns the current timestamp. This may involve reading the
+// hardware, so it may take anything up to a second to complete.
+
+cyg_uint32 Cyg_WallClock::get_current_time()
+{
+    Cyg_Clock::cyg_resolution res = Cyg_Clock::real_time_clock->get_resolution();
+        
+    Cyg_Scheduler::lock();
+
+    cyg_tick_count diff = Cyg_Clock::real_time_clock->current_value()
+                          - epoch_ticks;
+
+    diff = ( diff * res.dividend ) / ( res.divisor * 1000000000LL ) ;
+    
+    Cyg_Scheduler::unlock();
+
+    return epoch_time_stamp + diff;
+}
+
+/*---------------------------------------------------------------------------*/
+// Sets the value of the timestamp relative to now. This may involve
+// writing to the hardware, so it may take anything up to a second to
+// complete.
+void Cyg_WallClock::set_current_time( cyg_uint32 time_stamp )
+{
+    Cyg_Scheduler::lock();
+
+    epoch_time_stamp    = time_stamp;
+    epoch_ticks         = Cyg_Clock::real_time_clock->current_value();
+
+    Cyg_Scheduler::unlock();
+}
+
+/*---------------------------------------------------------------------------*/
+
+#endif
+/*---------------------------------------------------------------------------*/
+/* End of devs/wallclock/emulate.cxx */