/*
*********************************************************************************************************
*                                               uC/OS-II
*                                         The Real-Time Kernel
*
*                        (c) Copyright 1992-1998, Jean J. Labrosse, Plantation, FL
*                                          All Rights Reserved
*
*                                     TI C6414 DSP Specific code
*                                          Little Endian Mode*
*                                      Code Composer Studio V3.1
*
* File         : OS_CPU_C.C
*********************************************************************************************************
*/
#define  OS_CPU_GLOBALS
#include "..\..\..\Project\includes.h"

/*
*********************************************************************************************************
*                                        INITIALIZE A TASK'S STACK
*
* Description: This function is called by either OSTaskCreate() or OSTaskCreateExt() to initialize the
*              stack frame of the task being created.  This function is highly processor specific.
*
* Arguments  : task          is a pointer to the task code
*
*              pdata         is a pointer to a user supplied data area that will be passed to the task
*                            when the task first executes.
*
*              ptos          is a pointer to the top of stack.  It is assumed that 'ptos' points to
*                            a 'free' entry on the task stack.  If OS_STK_GROWTH is set to 1 then
*                            'ptos' will contain the HIGHEST valid address of the stack.  Similarly, if
*                            OS_STK_GROWTH is set to 0, the 'ptos' will contains the LOWEST valid address
*                            of the stack.
*
*              opt           specifies options that can be used to alter the behavior of OSTaskStkInit().
*                            (see uCOS_II.H for OS_TASK_OPT_???).
*
* Returns    : Always returns the location of the new top-of-stack' once the processor registers have
*              been placed on the stack in the proper order.
*
* Note(s)    : Interrupts are enabled when your task starts executing.
*********************************************************************************************************
*/
OS_STK * OSTaskStkInit(void (*task)(void *pd), void *pdata, OS_STK *ptos, INT16U opt)
{
 INIT_STACK_FRAME   *StkFrame, *StackBottom; 
 int * StackFreePointer ;
 
 /* THE SP MUST BE ALIGNED ON AN 8-BYTE BOUNDARY.*/  
 StkFrame =  (INIT_STACK_FRAME   *)  ((int)ptos &~7 ); 
 StackBottom  = StkFrame ;
 StkFrame-- ;  /* to the bottom of the frame, to init the struct. */

 StkFrame->Start_Address = task ;
 
 StkFrame->A0   =   0x0A00     ;
 StkFrame->A1   =   0x0A01     ;
 StkFrame->A2   =   0x0A02     ;
 StkFrame->A3   =   0x0A03     ;
 StkFrame->A4   =   (int) pdata    ; /* the first argument of C function here*/
 StkFrame->A5   =   0x0A05     ;
 StkFrame->A6   =   0x0A06     ;
 StkFrame->A7   =   0x0A07     ;
 StkFrame->A8   =   0x0A08     ;
 StkFrame->A9   =   0x0A09     ;
 StkFrame->A10  =   0x0A10     ;
 StkFrame->A11  =   0x0A11     ;
 StkFrame->A12  =   0x0A12     ;
 StkFrame->A13  =   0x0A13     ;
 StkFrame->A14  =   0x0A14     ;
 StkFrame->A15  =   0x0A15     ;
 StkFrame->A16   =   0x0A16     ;
 StkFrame->A17   =   0x0A17     ;
 StkFrame->A18   =   0x0A18     ;
 StkFrame->A19   =   0x0A19    ;
 StkFrame->A20   =   0x0A20    ;
 StkFrame->A21   =   0x0A21     ;
 StkFrame->A22   =   0x0A22     ;
 StkFrame->A23   =   0x0A23     ;
 StkFrame->A24   =   0x0A24     ;
 StkFrame->A25   =   0x0A25     ;
 StkFrame->A26  =   0x0A26     ;
 StkFrame->A27  =   0x0A27     ;
 StkFrame->A28  =   0x0A28     ;
 StkFrame->A29  =   0x0A29     ;
 StkFrame->A30  =   0x0A30     ;
 StkFrame->A31  =   0x0A31    ;

 StkFrame->B0   =   0x0B00     ;
 StkFrame->B1   =   0x0B01     ;
 StkFrame->B2   =   0x0B02     ;
 StkFrame->B3   =   (int) task ;  //for cosmetic reason
 StkFrame->B4   =   0x0B04     ;
 StkFrame->B5   =   0x0B05     ;
 StkFrame->B6   =   0x0B06     ;
 StkFrame->B7   =   0x0B07     ;
 StkFrame->B8   =   0x0B08     ;
 StkFrame->B9   =   0x0B09     ;
 StkFrame->B10  =   0x0B10     ;
 StkFrame->B11  =   0x0B11     ;
 StkFrame->B12  =   0x0B12     ;
 StkFrame->B13  =   0x0B13     ;
 StkFrame->B14  =   DSP_C6x_GetCurrentDP()  ;   /* Save current data pointer */
 StkFrame->B15  =   (int) StackBottom  ;   /* Save the SP */
 StkFrame->B16   =   0x0B16     ;
 StkFrame->B17   =   0x0B17     ;
 StkFrame->B18   =   0x0B18     ;
 StkFrame->B19   =   0x0B19 ;  
 StkFrame->B20   =   0x0B20     ;
 StkFrame->B21   =   0x0B21     ;
 StkFrame->B22   =   0x0B22     ;
 StkFrame->B23   =   0x0B23     ;
 StkFrame->B24   =   0x0B24     ;
 StkFrame->B25   =   0x0B25     ;
 StkFrame->B26  =   0x0B26     ;
 StkFrame->B27  =   0x0B27     ;
 StkFrame->B28  =   0x0B28     ;
 StkFrame->B29  =   0x0B29     ; 
 StkFrame->B30  =   0x0B30     ;
 StkFrame->B31  =   0x0B31     ;  
   
 StkFrame->AMR = 0 ;  /*default value as it was after reset*/
 StkFrame->CSR = 0x0103 ; /* Little Endian(bit8 = 1); PGIE set 1; GIE set 1 */
  StkFrame->IER = 0x02 ;  /* Just set the NMIF bit */
 StkFrame->IRP = 0xabcdabcd ; /* never return, so any value could used here. */
 
 StackFreePointer = (int *) StkFrame ;
 StackFreePointer-- ; /* Jusr move 4-BYTE(int) to the next free position */

 return ((OS_STK *) StackFreePointer);
}

/*$PAGE*/ /*
*********************************************************************************************************
*                                           HANDLE TIMER TICK ISR
*             - void OSTickISR(void) -
*
* Description: This function is the C6x-DSP Timer0 ISR. And the timer tick should be 10~100 /sec.
*    It also offers the time tick to uC/OS-II.
**********************************************************************************************************
*/
void OSTickISR(void)
{
 DSP_C6x_Save();

 OSIntEnter();
 
 if (OSIntNesting == 1)
  {
   OSTCBCur->OSTCBStkPtr = (OS_STK *) DSP_C6x_GetCurrentSP();
  }
   
 /* You can enable Interrupt again here,
  if want to use nested interrupt..... */
 
 OSTimeTick();
 
 OSIntExit();
 
 DSP_C6x_Resume();
 
 asm (" nop 5"); //important!
   // this can avoid a stack error when compile with the optimization!
}
 
/*$PAGE*/
/*
*********************************************************************************************************
*                                       OS INITIALIZATION HOOK
*                                            (BEGINNING)
*
* Description: This function is called by OSInit() at the beginning of OSInit().
*
* Arguments  : none
*
* Note(s)    : 1) Interrupts should be disabled during this call.
*********************************************************************************************************
*/
#if OS_CPU_HOOKS_EN > 0 && OS_VERSION > 203
void  OSInitHookBegin (void)
{
}
#endif

/*
*********************************************************************************************************
*                                       OS INITIALIZATION HOOK
*                                               (END)
*
* Description: This function is called by OSInit() at the end of OSInit().
*
* Arguments  : none
*
* Note(s)    : 1) Interrupts should be disabled during this call.
*********************************************************************************************************
*/
#if OS_CPU_HOOKS_EN > 0 && OS_VERSION > 203
void  OSInitHookEnd (void)
{
}
#endif

/*$PAGE*/ /*
*********************************************************************************************************
*                                          TASK CREATION HOOK
*
* Description: This function is called when a task is created.
*
* Arguments  : ptcb   is a pointer to the task control block of the task being created.
*
* Note(s)    : 1) Interrupts are disabled during this call.
*********************************************************************************************************
*/
#if OS_CPU_HOOKS_EN > 0
void  OSTaskCreateHook (OS_TCB *ptcb)
{
    ptcb = ptcb;                       /* Prevent compiler warning                                     */
}
#endif

/*
*********************************************************************************************************
*                                           TASK DELETION HOOK
*
* Description: This function is called when a task is deleted.
*
* Arguments  : ptcb   is a pointer to the task control block of the task being deleted.
*
* Note(s)    : 1) Interrupts are disabled during this call.
*********************************************************************************************************
*/
#if OS_CPU_HOOKS_EN > 0
void  OSTaskDelHook (OS_TCB *ptcb)
{
    ptcb = ptcb;                       /* Prevent compiler warning                                     */
}
#endif

/*
*********************************************************************************************************
*                                             IDLE TASK HOOK
*
* Description: This function is called by the idle task.  This hook has been added to allow you to do 
*              such things as STOP the CPU to conserve power.
*
* Arguments  : none
*
* Note(s)    : 1) Interrupts are enabled during this call.
*********************************************************************************************************
*/
#if OS_CPU_HOOKS_EN > 0 && OS_VERSION >= 251
void  OSTaskIdleHook (void)
{
}
#endif

/*
*********************************************************************************************************
*                                           STATISTIC TASK HOOK
*
* Description: This function is called every second by uC/OS-II's statistics task.  This allows your
*              application to add functionality to the statistics task.
*
* Arguments  : none
*********************************************************************************************************
*/

#if OS_CPU_HOOKS_EN > 0
void  OSTaskStatHook (void)
{
}
#endif
/*
*********************************************************************************************************
*                                           TASK SWITCH HOOK
*
* Description: This function is called when a task switch is performed.  This allows you to perform other
*              operations during a context switch.
*
* Arguments  : none
*
* Note(s)    : 1) Interrupts are disabled during this call.
*              2) It is assumed that the global pointer 'OSTCBHighRdy' points to the TCB of the task that
*                 will be 'switched in' (i.e. the highest priority task) and, 'OSTCBCur' points to the
*                 task being switched out (i.e. the preempted task).
*********************************************************************************************************
*/
#if OS_CPU_HOOKS_EN > 0
void  OSTaskSwHook (void)
{
}
#endif

/*
*********************************************************************************************************
*                                           OSTCBInit() HOOK
*
* Description: This function is called by OS_TCBInit() after setting up most of the TCB.
*
* Arguments  : ptcb    is a pointer to the TCB of the task being created.
*
* Note(s)    : 1) Interrupts may or may not be ENABLED during this call.
*********************************************************************************************************
*/
#if OS_CPU_HOOKS_EN > 0 && OS_VERSION > 203
void  OSTCBInitHook (OS_TCB *ptcb)
{
    ptcb = ptcb;                                           /* Prevent Compiler warning                 */
}
#endif

/*
*********************************************************************************************************
*                                               TICK HOOK
*
* Description: This function is called every tick.
*
* Arguments  : none
*
* Note(s)    : 1) Interrupts may or may not be ENABLED during this call.
*********************************************************************************************************
*/
#if OS_CPU_HOOKS_EN > 0
void  OSTimeTickHook (void)
{ 
}
#endif