/* Microsoft Reference Implementation for TPM 2.0
 *
 *  The copyright in this software is being made available under the BSD License,
 *  included below. This software may be subject to other third party and
 *  contributor rights, including patent rights, and no such rights are granted
 *  under this license.
 *
 *  Copyright (c) Microsoft Corporation
 *
 *  All rights reserved.
 *
 *  BSD License
 *
 *  Redistribution and use in source and binary forms, with or without modification,
 *  are permitted provided that the following conditions are met:
 *
 *  Redistributions of source code must retain the above copyright notice, this list
 *  of conditions and the following disclaimer.
 *
 *  Redistributions in binary form must reproduce the above copyright notice, this
 *  list of conditions and the following disclaimer in the documentation and/or
 *  other materials provided with the distribution.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ""AS IS""
 *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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 */
// 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_