/**************************************************************************/
/*                                                                        */
/*       Copyright (c) Microsoft Corporation. All rights reserved.        */
/*                                                                        */
/*       This software is licensed under the Microsoft Software License   */
/*       Terms for Microsoft Azure RTOS. Full text of the license can be  */
/*       found in the LICENSE file at https://aka.ms/AzureRTOS_EULA       */
/*       and in the root directory of this software.                      */
/*                                                                        */
/**************************************************************************/


/**************************************************************************/
/**************************************************************************/
/**                                                                       */
/** ThreadX Component                                                     */
/**                                                                       */
/**   Initialize                                                          */
/**                                                                       */
/**************************************************************************/
/**************************************************************************/

#define TX_SOURCE_CODE


/* Include necessary system files.  */

#include "tx_api.h"
#include "tx_initialize.h"
#include "tx_thread.h"
#include "tx_timer.h"


/* Define any port-specific scheduling data structures.  */

TX_PORT_SPECIFIC_DATA


#ifdef TX_SAFETY_CRITICAL
TX_SAFETY_CRITICAL_EXCEPTION_HANDLER
#endif


/**************************************************************************/
/*                                                                        */
/*  FUNCTION                                               RELEASE        */
/*                                                                        */
/*    _tx_initialize_kernel_enter                         PORTABLE C      */
/*                                                           6.0          */
/*  AUTHOR                                                                */
/*                                                                        */
/*    William E. Lamie, Microsoft Corporation                             */
/*                                                                        */
/*  DESCRIPTION                                                           */
/*                                                                        */
/*    This function is the first ThreadX function called during           */
/*    initialization.  It is called from the application's "main()"       */
/*    function.  It is important to note that this routine never          */
/*    returns.  The processing of this function is relatively simple:     */
/*    it calls several ThreadX initialization functions (if needed),      */
/*    calls the application define function, and then invokes the         */
/*    scheduler.                                                          */
/*                                                                        */
/*  INPUT                                                                 */
/*                                                                        */
/*    None                                                                */
/*                                                                        */
/*  OUTPUT                                                                */
/*                                                                        */
/*    None                                                                */
/*                                                                        */
/*  CALLS                                                                 */
/*                                                                        */
/*    _tx_initialize_low_level          Low-level initialization          */
/*    _tx_initialize_high_level         High-level initialization         */
/*    tx_application_define             Application define function       */
/*    _tx_thread_scheduler              ThreadX scheduling loop           */
/*                                                                        */
/*  CALLED BY                                                             */
/*                                                                        */
/*    main                              Application main program          */
/*                                                                        */
/*  RELEASE HISTORY                                                       */
/*                                                                        */
/*    DATE              NAME                      DESCRIPTION             */
/*                                                                        */
/*  05-19-2020     William E. Lamie         Initial Version 6.0           */
/*                                                                        */
/**************************************************************************/
VOID  _tx_initialize_kernel_enter(VOID)
{

    /* Determine if the compiler has pre-initialized ThreadX.  */
    if (_tx_thread_system_state != TX_INITIALIZE_ALMOST_DONE)
    {

        /* No, the initialization still needs to take place.  */

        /* Ensure that the system state variable is set to indicate 
           initialization is in progress.  Note that this variable is 
           later used to represent interrupt nesting.  */
        _tx_thread_system_state =  TX_INITIALIZE_IN_PROGRESS;

        /* Call any port specific preprocessing.  */
        TX_PORT_SPECIFIC_PRE_INITIALIZATION

        /* Invoke the low-level initialization to handle all processor specific
           initialization issues.  */
        _tx_initialize_low_level();
    
        /* Invoke the high-level initialization to exercise all of the 
           ThreadX components and the application's initialization 
           function.  */
        _tx_initialize_high_level();

        /* Call any port specific post-processing.  */
        TX_PORT_SPECIFIC_POST_INITIALIZATION
    }

    /* Optional processing extension.  */
    TX_INITIALIZE_KERNEL_ENTER_EXTENSION

    /* Ensure that the system state variable is set to indicate 
       initialization is in progress.  Note that this variable is 
       later used to represent interrupt nesting.  */
    _tx_thread_system_state =  TX_INITIALIZE_IN_PROGRESS;

    /* Call the application provided initialization function.  Pass the
       first available memory address to it.  */
    tx_application_define(_tx_initialize_unused_memory);

    /* Set the system state in preparation for entering the thread 
       scheduler.  */
    _tx_thread_system_state =  TX_INITIALIZE_IS_FINISHED;

    /* Call any port specific pre-scheduler processing.  */
    TX_PORT_SPECIFIC_PRE_SCHEDULER_INITIALIZATION

    /* Enter the scheduling loop to start executing threads!  */
    _tx_thread_schedule();

#ifdef TX_SAFETY_CRITICAL

    /* If we ever get here, raise safety critical exception.  */
    TX_SAFETY_CRITICAL_EXCEPTION(__FILE__, __LINE__, 0);
#endif
}

