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+#ifndef CYGONCE_IO_WALLCLOCK_HXX
+#define CYGONCE_IO_WALLCLOCK_HXX
+
+//==========================================================================
+//
+//      wallclock.hxx
+//
+//      Wallclock 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:          1999-03-05
+// Purpose:       Wall Clock declarations
+// Description:   This file defines the interface to the wall clock device
+//                that provides real time stamps. Actual implementations of
+//                this driver can be found in devs/wallclock.
+// Usage:         #include <cyg/io/wallclock.hxx>
+//
+//####DESCRIPTIONEND####
+//
+//==========================================================================
+
+#include <cyg/infra/cyg_type.h>
+
+// -------------------------------------------------------------------------
+// Wallclock class
+
+class Cyg_WallClock
+{
+
+public:
+
+    Cyg_WallClock();
+
+    // Returns the number of seconds elapsed since 1970-01-01 00:00:00.
+    // This may involve reading the hardware, so it may take anything
+    // up to a second to complete.
+    cyg_uint32 get_current_time();
+
+    // Sets the clock. Argument is seconds elapsed since 1970-01-01 00:00:00.
+    // This may involve writing to the hardware, so it may take
+    // anything up to a second to complete.
+    void set_current_time( cyg_uint32 time_stamp );
+
+    // A static pointer to the single system defined wall clock device.
+    static Cyg_WallClock *wallclock;
+
+private:
+
+    // Functions implemented by the hardware-specific part of the
+    // driver.
+
+    // Note: While the API specifies elapsed time since 1970-01-01
+    // 00:00:00 this is only an actual requirement if the driver is
+    // used in set-get mode - in init-get mode, the upper layer of the
+    // driver only needs to know the number of elapsed seconds between
+    // the init_hw_seconds and get_hw_seconds calls; the hardware
+    // epoch base is factored out, so the driver can use any base
+    // desired (see the emulated device).
+
+#ifndef CYGSEM_WALLCLOCK_SET_GET_MODE
+    // Called to initialize the hardware clock to a known sane state.
+    void init_hw_seconds( void );
+#endif
+
+    // Returns the number of seconds elapsed since 1970-01-01 00:00:00.
+    // (or any desired epoch when in init-get mode)
+    cyg_uint32 get_hw_seconds( void );
+
+#ifdef CYGSEM_WALLCLOCK_SET_GET_MODE
+    // Sets the clock. Argument is seconds elapsed since 1970-01-01 00:00:00.
+    void set_hw_seconds( cyg_uint32 secs );
+#endif
+};
+
+#ifdef __CYGBLD_DRIVER_PRIVATE
+
+// -------------------------------------------------------------------------
+// Some helper functions
+
+// This function is from the Linux kernel.
+//
+// Converts Gregorian date to seconds since 1970-01-01 00:00:00.
+// Assumes input in normal date format, i.e. 1980-12-31 23:59:59
+// => year=1980, mon=12, day=31, hour=23, min=59, sec=59.
+//
+// This algorithm was first published by Gauss (I think).
+//
+// WARNING: this function will overflow on 2106-02-07 06:28:16 on
+// machines were long is 32-bit! (However, as time_t is signed, we
+// will already get problems at other places on 2038-01-19 03:14:08)
+static cyg_uint32
+_simple_mktime(cyg_uint32 year, cyg_uint32 mon,
+		     cyg_uint32 day, cyg_uint32 hour,
+		     cyg_uint32 min, cyg_uint32 sec)
+{
+	if (0 >= (int) (mon -= 2)) {	/* 1..12 -> 11,12,1..10 */
+		mon += 12;	/* Puts Feb last since it has leap day */
+		year -= 1;
+	}
+	return (((
+		(cyg_uint32)(year/4 - year/100 + year/400 + 367*mon/12 + day) +
+		year*365 - 719499
+		)*24 + hour /* now have hours */
+		)*60 + min /* now have minutes */
+		)*60 + sec; /* finally seconds */
+}
+
+//-----------------------------------------------------------------------------
+// BCD helper macros
+#define TO_BCD(x) (((x/10)<<4) | (x%10))
+#define TO_DEC(x) (((x>>4)*10) + (x&0xf))
+
+
+// -------------------------------------------------------------------------
+#endif // __CYGBLD_DRIVER_PRIVATE
+
+#endif // ifndef CYGONCE_DEVS_WALLCLOCK_HXX
+// EOF wallclock.hxx