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69 lines
3.0 KiB
69 lines
3.0 KiB
/* Microsoft Reference Implementation for TPM 2.0
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*
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* The copyright in this software is being made available under the BSD License,
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* included below. This software may be subject to other third party and
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* contributor rights, including patent rights, and no such rights are granted
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* under this license.
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*
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* Copyright (c) Microsoft Corporation
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*
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* All rights reserved.
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*
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* BSD License
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this list
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* of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice, this
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* list of conditions and the following disclaimer in the documentation and/or
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* other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ""AS IS""
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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// This file contains the instance data for the Platform module. It is collected
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// in this file so that the state of the module is easier to manage.
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#ifndef _PLATFORM_CLOCK_H_
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#define _PLATFORM_CLOCK_H_
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#ifdef _MSC_VER
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#include <sys/types.h>
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#include <sys/timeb.h>
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#else
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#include <sys/time.h>
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#include <time.h>
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#endif
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// CLOCK_NOMINAL is the number of hardware ticks per mS. A value of 300000 means
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// that the nominal clock rate used to drive the hardware clock is 30 MHz. The
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// adjustment rates are used to determine the conversion of the hardware ticks to
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// internal hardware clock value. In practice, we would expect that there would be
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// a hardware register will accumulated mS. It would be incremented by the output
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// of a pre-scaler. The pre-scaler would divide the ticks from the clock by some
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// value that would compensate for the difference between clock time and real time.
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// The code in Clock does the emulation of this function.
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#define CLOCK_NOMINAL 30000
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// A 1% change in rate is 300 counts
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#define CLOCK_ADJUST_COARSE 300
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// A 0.1% change in rate is 30 counts
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#define CLOCK_ADJUST_MEDIUM 30
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// A minimum change in rate is 1 count
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#define CLOCK_ADJUST_FINE 1
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// The clock tolerance is +/-15% (4500 counts)
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// Allow some guard band (16.7%)
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#define CLOCK_ADJUST_LIMIT 5000
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#endif // _PLATFORM_CLOCK_H_
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