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/********************************************************************************/
/* */
/* Platform Clock . */
/* Written by Ken Goldman */
/* IBM Thomas J. Watson Research Center */
/* $Id: PlatformClock.h 1594 2020-03-26 22:15:48Z kgoldman $ */
/* */
/* Licenses and Notices */
/* */
/* 1. Copyright Licenses: */
/* */
/* - Trusted Computing Group (TCG) grants to the user of the source code in */
/* this specification (the "Source Code") a worldwide, irrevocable, */
/* nonexclusive, royalty free, copyright license to reproduce, create */
/* derivative works, distribute, display and perform the Source Code and */
/* derivative works thereof, and to grant others the rights granted herein. */
/* */
/* - The TCG grants to the user of the other parts of the specification */
/* (other than the Source Code) the rights to reproduce, distribute, */
/* display, and perform the specification solely for the purpose of */
/* developing products based on such documents. */
/* */
/* 2. Source Code Distribution Conditions: */
/* */
/* - Redistributions of Source Code must retain the above copyright licenses, */
/* this list of conditions and the following disclaimers. */
/* */
/* - Redistributions in binary form must reproduce the above copyright */
/* licenses, this list of conditions and the following disclaimers in the */
/* documentation and/or other materials provided with the distribution. */
/* */
/* 3. Disclaimers: */
/* */
/* - THE COPYRIGHT LICENSES SET FORTH ABOVE DO NOT REPRESENT ANY FORM OF */
/* LICENSE OR WAIVER, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, WITH */
/* RESPECT TO PATENT RIGHTS HELD BY TCG MEMBERS (OR OTHER THIRD PARTIES) */
/* THAT MAY BE NECESSARY TO IMPLEMENT THIS SPECIFICATION OR OTHERWISE. */
/* Contact TCG Administration (admin@trustedcomputinggroup.org) for */
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/* liability, including liability for infringement of any proprietary */
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/* */
/* (c) Copyright IBM Corp. and others, 2019 - 2020 */
/* */
/********************************************************************************/
// 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_
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