/********************************************************************************/
/*										*/
/*				Platform Clock			.     		*/
/*			     Written by Ken Goldman				*/
/*		       IBM Thomas J. Watson Research Center			*/
/*            $Id: PlatformClock.h 1594 2020-03-26 22:15:48Z kgoldman $		*/
/*										*/
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/********************************************************************************/

// C.16 PlatformClock.h This file contains the instance data for the Platform module. It is
// collected in this file so that the state of the module is easier to manage.
#ifndef _PLATFORM_CLOCK_H_
#define _PLATFORM_CLOCK_H_
#ifdef _MSC_VER
#include <sys/types.h>
#include <sys/timeb.h>
#else
#include <sys/time.h>
#include <time.h>
#endif
// CLOCK_NOMINAL is the number of hardware ticks per mS. A value of 300000 means that the nominal
// clock rate used to drive the hardware clock is 30 MHz. The adjustment rates are used to determine
// the conversion of the hardware ticks to internal hardware clock value. In practice, we would
// expect that there would be a hardware register will accumulated mS. It would be incremented by
// the output of a pre-scaler. The pre-scaler would divide the ticks from the clock by some value
// that would compensate for the difference between clock time and real time. The code in Clock does
// the emulation of this function.
#define     CLOCK_NOMINAL           30000
// A 1% change in rate is 300 counts
#define     CLOCK_ADJUST_COARSE     300
// A 0.1% change in rate is 30 counts
#define     CLOCK_ADJUST_MEDIUM     30
// A minimum change in rate is 1 count
#define     CLOCK_ADJUST_FINE       1
// The clock tolerance is +/-15% (4500 counts) Allow some guard band (16.7%)
#define     CLOCK_ADJUST_LIMIT      5000
#endif // _PLATFORM_CLOCK_H_