hic.c

nucleus plus ARM9 source code

/*      Application                                                      */
/*                                                                       */
/* CALLS                                                                 */
/*                                                                       */
/*      TCC_Current_HISR_Pointer            Retrieve current HISR pointer*/
/*      TCC_Current_Task_Pointer            Retrieve current task pointer*/
/*      TCT_Get_Current_Protect             Pickup current protection    */
/*      TCT_Protect                         Protect history structures   */
/*      TCT_Set_Current_Protect             Set current protection       */
/*      TCT_Unprotect                       Release history protection   */
/*      TCT_Unprotect_Specific              Release history protection   */
/*      TMT_Retrieve_Clock                  Retrieve system clock        */
/*                                                                       */
/* INPUTS                                                                */
/*                                                                       */
/*      param1                              First history parameter      */
/*      param2                              Second history parameter     */
/*      param3                              Third history parameter      */
/*                                                                       */
/* OUTPUTS                                                               */
/*                                                                       */
/*      None                                                             */
/*                                                                       */
/* HISTORY                                                               */
/*                                                                       */
/*         DATE                    REMARKS                               */
/*                                                                       */
/*      03-01-1993      Created initial version 1.0                      */
/*      04-19-1993      Verified version 1.0                             */
/*      03-01-1994      Modified protection logic,                       */
/*                        resulting in version 1.1                       */
/*                                                                       */
/*      03-18-1994      Verified version 1.1                             */
/*                                                                       */
/*************************************************************************/
VOID  HIC_Make_History_Entry(DATA_ELEMENT id, UNSIGNED param1,
                                        UNSIGNED param2, UNSIGNED param3)
{
TC_PROTECT              *save_protect;      /* Save protect pointer     */
HI_HISTORY_ENTRY        *pointer;           /* Quick access pointer     */
NU_SUPERV_USER_VARIABLES

    /* Switch to supervisor mode */
    NU_SUPERVISOR_MODE();

    /* If we are not in initialization, get the current protection state */
    if (INC_Initialize_State ==  INC_END_INITIALIZE)

        /* Pickup current protection.  */
        save_protect =  TCT_Get_Current_Protect();

    else
        /* we are in initialization, just clear save_protect */
        save_protect = 0;

    /* Protect the history data structures.  */
    TCT_Protect(&HID_History_Protect);

    /* Determine if history saving is enabled.  */
    if (HID_History_Enable)
    {

        /* Yes, history saving is enabled.  */

        /* Build a pointer to the next location to write to in the table. */
        pointer =  &HIC_History_Table[HID_Write_Index];

        /* Place the necessary information into the history table at the
           current location.  */
        pointer -> hi_id =      id;
        pointer -> hi_param1 =  param1;
        pointer -> hi_param2 =  param2;
        pointer -> hi_param3 =  param3;
        pointer -> hi_time =    TMT_Retrieve_Clock();

        /* Now determine what thread we are currently in.  */
        if ((pointer -> hi_thread =
                (VOID *) TCC_Current_Task_Pointer()) != NU_NULL)

            /* Task thread.  Set the caller flag accordingly.  */
            pointer -> hi_caller =  HI_TASK;

        else if ((pointer -> hi_thread =
                (VOID *) TCC_Current_HISR_Pointer()) != NU_NULL)

            /* HISR thread.  Set the caller flag accordingly.  */
            pointer -> hi_caller =  HI_HISR;

        else

            /* Neither a task or HISR, it caller must be initialization.  */
            pointer -> hi_caller =  HI_INITIALIZE;

        /* Move the write index.  */
        HID_Write_Index++;

        /* Check for a wrap condition on the write index.  */
        if (HID_Write_Index >= HI_MAX_ENTRIES)

            /* Wrap condition present, adjust the write index to the top of the
               table.  */
            HID_Write_Index =  0;

        /* Increment the entries counter, if the maximum has not yet been
           reached.  */
        if (HID_Entry_Count < HI_MAX_ENTRIES)

            /* Increment the total entries counter.  */
            HID_Entry_Count++;
        else

            /* Drag the read index along with the write index.  */
            HID_Read_Index =  HID_Write_Index;
    }

    /* Determine if there was protection in force before call.  */
    if (save_protect)
    {

        /* Make saved protection the current again.  */
        TCT_Set_Current_Protect(save_protect);

        /* Release the history protection.  */
        TCT_Unprotect_Specific(&HID_History_Protect);
    }
    else

        /* Release protection.  */
        TCT_Unprotect();

    /* Return to user mode */
    NU_USER_MODE();
}


/*************************************************************************/
/*                                                                       */
/* FUNCTION                                                              */
/*                                                                       */
/*      HIC_Retrieve_History_Entry                                       */
/*                                                                       */
/* DESCRIPTION                                                           */
/*                                                                       */
/*      This function retrieves the next oldest entry in the history     */
/*      table.  If no more entries are available, an error status is     */
/*      returned.                                                        */
/*                                                                       */
/* CALLED BY                                                             */
/*                                                                       */
/*      Application                                                      */
/*                                                                       */
/* CALLS                                                                 */
/*                                                                       */
/*      TCT_Protect                         Protect history structures   */
/*      TCT_Unprotect                       Release history protection   */
/*                                                                       */
/* INPUTS                                                                */
/*                                                                       */
/*      id                                  Destination for entry id     */
/*      param1                              Destination for parameter 1  */
/*      param2                              Destination for parameter 2  */
/*      param3                              Destination for parameter 3  */
/*      time                                Destination for time of entry*/
/*      task                                Destination of task pointer  */
/*      hisr                                Destination of hisr pointer  */
/*                                                                       */
/* OUTPUTS                                                               */
/*                                                                       */
/*      None                                                             */
/*                                                                       */
/* HISTORY                                                               */
/*                                                                       */
/*         DATE                    REMARKS                               */
/*                                                                       */
/*      03-01-1993      Created initial version 1.0                      */
/*      04-19-1993      Verified version 1.0                             */
/*                                                                       */
/*************************************************************************/
STATUS  HIC_Retrieve_History_Entry(DATA_ELEMENT *id, UNSIGNED *param1,
                                        UNSIGNED *param2, UNSIGNED *param3,
                                        UNSIGNED *time, NU_TASK **task,
                                        NU_HISR **hisr)
{

STATUS                  status;             /* Completion status        */
HI_HISTORY_ENTRY        *pointer;           /* Quick access pointer     */
NU_SUPERV_USER_VARIABLES

    /* Switch to supervisor mode */
    NU_SUPERVISOR_MODE();

    /* Initialize status.  */
    status =  NU_SUCCESS;

    /* Protect the history data structures.  */
    TCT_Protect(&HID_History_Protect);

    /* Determine if there is an entry in the history log.  */
    if (HID_Entry_Count)
    {

        /* Yes, there is at least one entry in the history log.  */

        /* Build a pointer to the next location to read from in the table. */
        pointer =  &HIC_History_Table[HID_Read_Index];

        /* Place the necessary information into the history table at the
           current location.  */
        *id =           pointer -> hi_id;
        *param1 =       pointer -> hi_param1;
        *param2 =       pointer -> hi_param2;
        *param3 =       pointer -> hi_param3;
        *time =         pointer -> hi_time;

        /* Now determine what thread the entry was made from.  */
        if (pointer -> hi_caller == HI_TASK)
        {

            /* Setup the task return parameter.  */
            *task =     (NU_TASK *) pointer -> hi_thread;
            *hisr =     NU_NULL;
        }
        else
        {

            /* In either HISR or initialize case place the thread value
               in the HISR return parameter.  */
            *hisr =     (NU_HISR *) pointer -> hi_thread;
            *task =     NU_NULL;
        }

        /* Move the read index.  */
        HID_Read_Index++;

        /* Check for a wrap condition on the read index.  */
        if (HID_Read_Index >= HI_MAX_ENTRIES)

            /* Wrap condition present, adjust the read index to the top of the
               table.  */
            HID_Read_Index =  0;

        /* Decrement the entries counter.  */
        HID_Entry_Count--;
    }
    else

        /* Return the end of history log status.  */
        status =  NU_END_OF_LOG;

    /* Release protection.  */
    TCT_Unprotect();

    /* Return to user mode */
    NU_USER_MODE();

    /* Return completion status to the caller.  */
    return(status);
}