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Diffstat (limited to 'src/tpm2/PlatformClock.h')
| -rw-r--r-- | src/tpm2/PlatformClock.h | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/src/tpm2/PlatformClock.h b/src/tpm2/PlatformClock.h new file mode 100644 index 0000000..8f6ebb9 --- /dev/null +++ b/src/tpm2/PlatformClock.h @@ -0,0 +1,89 @@ +/********************************************************************************/ +/* */ +/* 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 */ +/* information on specification licensing rights available through TCG */ +/* membership agreements. */ +/* */ +/* - THIS SPECIFICATION IS PROVIDED "AS IS" WITH NO EXPRESS OR IMPLIED */ +/* WARRANTIES WHATSOEVER, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR */ +/* FITNESS FOR A PARTICULAR PURPOSE, ACCURACY, COMPLETENESS, OR */ +/* NONINFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS, OR ANY WARRANTY */ +/* OTHERWISE ARISING OUT OF ANY PROPOSAL, SPECIFICATION OR SAMPLE. */ +/* */ +/* - Without limitation, TCG and its members and licensors disclaim all */ +/* liability, including liability for infringement of any proprietary */ +/* rights, relating to use of information in this specification and to the */ +/* implementation of this specification, and TCG disclaims all liability for */ +/* cost of procurement of substitute goods or services, lost profits, loss */ +/* of use, loss of data or any incidental, consequential, direct, indirect, */ +/* or special damages, whether under contract, tort, warranty or otherwise, */ +/* arising in any way out of use or reliance upon this specification or any */ +/* information herein. */ +/* */ +/* (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_ |