| /* 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 |
| * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON |
| * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| // 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_ |
