/*
Amazon FreeRTOS
Copyright (C) 2017 Amazon.com, Inc. or its affiliates.  All Rights Reserved.

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

 http://aws.amazon.com/freertos
 http://www.FreeRTOS.org
*/


/*
 * Utility functions required to gather run time statistics.  See:
 * http://www.freertos.org/rtos-run-time-stats.html
 *
 * Note that this is a simulated port, where simulated time is a lot slower than
 * real time, therefore the run time counter values have no real meaningful
 * units.
 *
 * Also note that it is assumed this demo is going to be used for short periods
 * of time only, and therefore timer overflows are not handled.
 */

/* FreeRTOS includes. */
#include <FreeRTOS.h>

/* Variables used in the creation of the run time stats time base.  Run time
 * stats record how much time each task spends in the Running state. */
static long long llInitialRunTimeCounterValue = 0LL, llTicksPerHundedthMillisecond = 0LL;

/*-----------------------------------------------------------*/

void vConfigureTimerForRunTimeStats( void )
{
    LARGE_INTEGER liPerformanceCounterFrequency, liInitialRunTimeValue;

    /* Initialise the variables used to create the run time stats time base.
     * Run time stats record how much time each task spends in the Running
     * state. */

    if( QueryPerformanceFrequency( &liPerformanceCounterFrequency ) == 0 )
    {
        llTicksPerHundedthMillisecond = 1;
    }
    else
    {
        /* How many times does the performance counter increment in 1/100th
         * millisecond. */
        llTicksPerHundedthMillisecond = liPerformanceCounterFrequency.QuadPart / 100000LL;

        /* What is the performance counter value now, this will be subtracted
         * from readings taken at run time. */
        QueryPerformanceCounter( &liInitialRunTimeValue );
        llInitialRunTimeCounterValue = liInitialRunTimeValue.QuadPart;
    }
}
/*-----------------------------------------------------------*/

unsigned long ulGetRunTimeCounterValue( void )
{
    LARGE_INTEGER liCurrentCount;
    unsigned long ulReturn;

    /* What is the performance counter value now? */
    QueryPerformanceCounter( &liCurrentCount );

    /* Subtract the performance counter value reading taken when the
     * application started to get a count from that reference point, then
     * scale to (simulated) 1/100ths of a millisecond. */
    if( llTicksPerHundedthMillisecond == 0 )
    {
        /* The trace macros can call this function before the kernel has been
         * started, in which case llTicksPerHundedthMillisecond will not have been
         * initialised. */
        ulReturn = 0;
    }
    else
    {
        ulReturn = ( unsigned long )
                   ( ( liCurrentCount.QuadPart - llInitialRunTimeCounterValue ) /
                     llTicksPerHundedthMillisecond );
    }

    return ulReturn;
}
/*-----------------------------------------------------------*/