/*
*********************************************************************************************************
* 文件: OS_CPU_C.C.
* 描述: uC/OS-II在 44B0X 上的移植代碼 C 語言部分,包括任務(wù)堆棧初始化代碼和鉤子函數(shù)等.
* 編寫:  
*********************************************************************************************************
*/
#include "2440addr.h"
#include "Includes.h"
#define  OS_CPU_GLOBALS


/*
*********************************************************************************************************
*                                        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)    : 1) XIRQ interrupts are disabled when your task starts executing. You can change this by 
*                 clearing BIT6 in the CCR.
*              2) The STOP instruction is disabled when your task starts executing.  You can change this
*                 by clearing BIT7 in the CCR.
*              3) The other interrupts (i.e. maskable interrupts) are enabled when your task starts
*                 executing.  You can change this by setting BIT4 in the CCR.
*              4) You can change pass the above options in the 'opt' argument.  You MUST only use the
*                 upper 8 bits of 'opt' because the lower bits are reserved by uC/OS-II.  If you make
*                 changes to the code below, you will need to ensure that it doesn't affect the behaviour
*                 of OSTaskIdle() and OSTaskStat().
*              5) Registers are initialized to make them easy to differentiate with a debugger.
*              6) All your tasks are assumed to be in NON-PAGED memory.  However, the tasks can call
*                 functions in PAGED memory and if a context switch occurs, the proper page will be
*                 saved/restored by uC/OS-II.  Page #0 is stored onto the task's stack as a 'dummy'
*                 value.
*********************************************************************************************************
*/
OS_STK *OSTaskStkInit (void (*task)(void *pd), void *p_arg, OS_STK *ptos, INT16U opt)
{
    OS_STK *stk;

    opt      = opt;                 /* 'opt' is not used, prevent warning                      */
    
    stk      = ptos;                /* Load stack pointer                                      */
    
    *(stk)   = (OS_STK)task;        /* Entry Point                                             */
    *(--stk) = (INT32U)0;         	/* LR                                                      */
    *(--stk) = (INT32U)0;         	/* R12                                                     */
    *(--stk) = (INT32U)0;         	/* R11                                                     */
    *(--stk) = (INT32U)0;         	/* R10                                                     */
    *(--stk) = (INT32U)0;         	/* R9                                                      */
    *(--stk) = (INT32U)0;         	/* R8                                                      */
    *(--stk) = (INT32U)0;         	/* R7                                                      */
    *(--stk) = (INT32U)0;         	/* R6                                                      */
    *(--stk) = (INT32U)0;         	/* R5                                                      */
    *(--stk) = (INT32U)0;         	/* R4                                                      */
    *(--stk) = (INT32U)0;         	/* R3                                                      */
    *(--stk) = (INT32U)0;         	/* R2                                                      */
    *(--stk) = (INT32U)0;         	/* R1                                                      */
    *(--stk) = (INT32U)p_arg;		/* R0 : argument                                           */
    *(--stk) = (INT32U)0x00000013L; /* CPSR  (SVC mode, Enable both IRQ and FIQ interrupts)    */
 									         
    return (stk);
}

#if OS_CPU_HOOKS_EN
/*
*********************************************************************************************************
*                                       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_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_VERSION > 203
void OSInitHookEnd (void)
{
}
#endif

/*
*********************************************************************************************************
*                                          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.
*********************************************************************************************************
*/
void OSTaskCreateHook (OS_TCB *ptcb)
{
    ptcb = ptcb;                       /* Prevent compiler warning                                     */
}

/*
*********************************************************************************************************
*                                           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.
*********************************************************************************************************
*/
void OSTaskDelHook (OS_TCB *ptcb)
{
    ptcb = ptcb;                       /* Prevent compiler warning                                     */
}

/*
*********************************************************************************************************
*                                           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).
*********************************************************************************************************
*/
void OSTaskSwHook (void)
{
   Uart_Printf("%d\n",OSPrioHighRdy);
}

/*
*********************************************************************************************************
*                                           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
*********************************************************************************************************
*/
void OSTaskStatHook (void)
{
}

/*
*********************************************************************************************************
*                                           OSTCBInit() HOOK
*
* Description: This function is called by OSTCBInit() 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_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.
*********************************************************************************************************
*/
void OSTimeTickHook (void)
{
  //Uart_Printf("t");	
}

/*
*********************************************************************************************************
*                                             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_VERSION >= 251
void OSTaskIdleHook (void)
{
   Uart_Printf("b"); 	
}
#endif
#endif
/*********************************************************************************************************
**                            End Of File
********************************************************************************************************/