/***************************************************************************
 * Copyright (c) 2024 Microsoft Corporation 
 * 
 * This program and the accompanying materials are made available under the
 * terms of the MIT License which is available at
 * https://opensource.org/licenses/MIT.
 * 
 * SPDX-License-Identifier: MIT
 **************************************************************************/

/**************************************************************************/
/**************************************************************************/
/**                                                                       */ 
/** Thread-Metric Component                                               */
/**                                                                       */
/**   Interrupt Preemption Processing Test                                */
/**                                                                       */
/**************************************************************************/
/**************************************************************************/


/**************************************************************************/ 
/*                                                                        */ 
/*  FUNCTION                                               RELEASE        */ 
/*                                                                        */ 
/*    tm_interrupt_preemption_processing_test             PORTABLE C      */ 
/*                                                           6.1.7        */ 
/*  AUTHOR                                                                */ 
/*                                                                        */ 
/*    William E. Lamie, Microsoft Corporation                             */ 
/*                                                                        */ 
/*  DESCRIPTION                                                           */ 
/*                                                                        */ 
/*    This file defines the preemptive scheduling test.                   */
/*                                                                        */ 
/*  RELEASE HISTORY                                                       */ 
/*                                                                        */ 
/*    DATE              NAME                      DESCRIPTION             */ 
/*                                                                        */ 
/*  10-15-2021     William E. Lamie         Initial Version 6.1.7         */
/*                                                                        */ 
/**************************************************************************/ 

#include "tm_api.h"


/* Define the counters used in the demo application...  */

unsigned long   tm_interrupt_preemption_thread_0_counter;
unsigned long   tm_interrupt_preemption_thread_1_counter;
unsigned long   tm_interrupt_preemption_handler_counter;


/* Define the test thread prototypes.  */

void            tm_interrupt_preemption_thread_0_entry(void);
void            tm_interrupt_preemption_thread_1_entry(void);
void            tm_interrupt_preemption_handler_entry(void);


/* Define the reporting thread prototype.  */

void            tm_interrupt_preemption_thread_report(void);


/* Define the interrupt handler.  This must be called from the RTOS.  */

void            tm_interrupt_preemption_handler(void);


/* Define the initialization prototype.  */

void            tm_interrupt_preemption_processing_initialize(void);


/* Define main entry point.  */

void tm_main()
{

    /* Initialize the test.  */
    tm_initialize(tm_interrupt_preemption_processing_initialize);
}


/* Define the interrupt processing test initialization.  */

void  tm_interrupt_preemption_processing_initialize(void)
{

    /* Create interrupt thread at priority 3.  */
    tm_thread_create(0, 3, tm_interrupt_preemption_thread_0_entry);

    /* Create thread that generates the interrupt at priority 10.  */
    tm_thread_create(1, 10, tm_interrupt_preemption_thread_1_entry);

    /* Resume just thread 1.  */
    tm_thread_resume(1);

    /* Create the reporting thread. It will preempt the other 
       threads and print out the test results.  */
    tm_thread_create(5, 2, tm_interrupt_preemption_thread_report);
    tm_thread_resume(5);
}


/* Define the interrupt thread.  This thread is resumed from the 
   interrupt handler.  It runs and suspends.  */
void  tm_interrupt_preemption_thread_0_entry(void)
{

    while(1)
    {

        /* Increment this thread's counter.  */
        tm_interrupt_preemption_thread_0_counter++;

        /* Suspend. This will allow the thread generating the 
           interrupt to run again.  */
        tm_thread_suspend(0);
    }
}

/* Define the thread that generates the interrupt.  */
void  tm_interrupt_preemption_thread_1_entry(void)
{

    while(1)
    {

        /* Force an interrupt. The underlying RTOS must see that the 
           the interrupt handler is called from the appropriate software
           interrupt or trap. */
        TM_CAUSE_INTERRUPT

        /* We won't get back here until the interrupt processing is complete,
           including the execution of the higher priority thread made ready
           by the interrupt.  */

        /* Increment this thread's counter.  */
        tm_interrupt_preemption_thread_1_counter++;
    }
}


/* Define the interrupt handler.  This must be called from the RTOS trap handler.
   To be fair, it must behave just like a processor interrupt, i.e. it must save
   the full context of the interrupted thread during the preemption processing. */
void  tm_interrupt_preemption_handler(void)
{

    /* Increment the interrupt count.  */
    tm_interrupt_preemption_handler_counter++;

    /* Resume the higher priority thread from the ISR.  */
    tm_thread_resume(0);
}


/* Define the interrupt test reporting thread.  */
void  tm_interrupt_preemption_thread_report(void)
{

unsigned long   total;
unsigned long   relative_time;
unsigned long   last_total;
unsigned long   average;


    /* Initialize the last total.  */
    last_total =  0;

    /* Initialize the relative time.  */
    relative_time =  0;

    while(1)
    {

        /* Sleep to allow the test to run.  */
        tm_thread_sleep(TM_TEST_DURATION);

        /* Increment the relative time.  */
        relative_time =  relative_time + TM_TEST_DURATION;

        /* Print results to the stdio window.  */
        printf("**** Thread-Metric Interrupt Preemption Processing Test **** Relative Time: %lu\n", relative_time);

        /* Calculate the total of all the counters.  */
        total =  tm_interrupt_preemption_thread_0_counter + tm_interrupt_preemption_thread_1_counter + tm_interrupt_preemption_handler_counter;

        /* Calculate the average of all the counters.  */
        average =  total/3;

        /* See if there are any errors.  */
        if ((tm_interrupt_preemption_thread_0_counter < (average - 1)) || 
            (tm_interrupt_preemption_thread_0_counter > (average + 1)) ||
            (tm_interrupt_preemption_thread_1_counter < (average - 1)) || 
            (tm_interrupt_preemption_thread_1_counter > (average + 1)) ||
            (tm_interrupt_preemption_handler_counter < (average - 1)) || 
            (tm_interrupt_preemption_handler_counter > (average + 1)))
        {

            printf("ERROR: Invalid counter value(s). Interrupt processing test has failed!\n");
        }

        /* Show the total interrupts for the time period.  */
        printf("Time Period Total:  %lu\n\n", tm_interrupt_preemption_handler_counter - last_total);

        /* Save the last total number of interrupts.  */
        last_total =  tm_interrupt_preemption_handler_counter;
    }
}