os_cpu_c.c

摩托罗拉MMC2107在ucosII的移植代码

/*
*********************************************************************************************************
*                                               uC/OS-II
*                                         The Real-Time Kernel
*
*                                       M.CORE Specific code
*
* File : OS_CPU_C.C
* By   : Kerby Suhre
*********************************************************************************************************
*/

#include "includes.h"
#include "plibdefs_mmc2107.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.
*********************************************************************************************************
*/

OS_STK *OSTaskStkInit (void (*task)(void *pd), void *pdata, OS_STK *ptos, INT16U opt)
{
    INT32U	 *stk;


    opt    = opt;							/* 'opt' is not used, prevent warning                  	*/
    stk    = (INT32U *)ptos;               	/* Load stack pointer                                  	*/
    *--stk = (INT32U)(0x00000000);     		/* R15 (Link register)									*/
    *--stk = (INT32U)(0x00000000);     		/* R14 (Non-volatile)									*/
    *--stk = (INT32U)(0x00000000);     		/* R13 (Non-volatile)									*/
    *--stk = (INT32U)(0x00000000);     		/* R12 (Non-volatile)									*/
    *--stk = (INT32U)(0x00000000);     		/* R11 (Non-volatile)									*/
    *--stk = (INT32U)(0x00000000);     		/* R10 (Non-volatile)									*/
    *--stk = (INT32U)(0x00000000);     		/* R9 (Non-volatile)									*/
    *--stk = (INT32U)(0x00000000);     		/* R8 (Non-volatile)									*/
    *--stk = (INT32U)(0x00000000);     		/* R7 (Volatile 6th argument)                          	*/
    *--stk = (INT32U)(0x00000000);     		/* R6 (Volatile 5th argument)                          	*/
    *--stk = (INT32U)(0x00000000);     		/* R5 (Volatile 4th argument)                          	*/
    *--stk = (INT32U)(0x00000000);     		/* R4 (Volatile 3rd argument)                          	*/
    *--stk = (INT32U)(0x00000000);     		/* R3 (Volatile 2nd argument)                          	*/
    *--stk = (INT32U)(pdata);          		/* R2 (Volatile 1st argument)                          	*/
    *--stk = (INT32U)(0x00000000);			/* R1 (Volatile data)                                  	*/
    *--stk = (INT32U)(0x80000150);			/* PSR (Supervisor mode, exceptions enabled)           	*/
    *--stk = (INT32U)(task);				/* PC (Program counter)                                	*/
    return ((void *)stk);
}

/*$PAGE*/
#if OS_CPU_HOOKS_EN
/*
*********************************************************************************************************
*                                          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)
{
}

/*
*********************************************************************************************************
*                                           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)
{
}

/*
*********************************************************************************************************
*                                               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)
{
}

/*
*********************************************************************************************************
*                                               HOOK BEGIN
*
* Description: This function is called at the beginning of "OSInit" in OS versions gerater than 2.03.
*
* Arguments  : none
*
* Note(s)    : 1) Interrupts may or may not be ENABLED during this call.
*********************************************************************************************************
*/
void OSInitHookBegin (void)
{
}

/*
*********************************************************************************************************
*                                               HOOK END
*
* Description: This function is called at the end of "OSInit"
*              in OS versions starting from 2.04.
*
* Arguments  : none
*
* Note(s)    : 1) Interrupts may or may not be ENABLED during this call.
*********************************************************************************************************
*/
void OSInitHookEnd (void)
{
}

/*
*********************************************************************************************************
*                                               HOOK TCB INIT
*
* Description: This function is called at the end of "OSTCBInit" before "OSTaskCreateHook" call
*              in OS versions starting from 2.04.
*
* Arguments  : ptcb   is a pointer to the task control block of the task being deleted.
*
* Note(s)    : 1) Interrupts may or may not be ENABLED during this call.
*********************************************************************************************************
*/
void OSTCBInitHook (OS_TCB *ptcb)
{
    ptcb = ptcb;                       /* Prevent compiler warning                                     */
}

/*
*********************************************************************************************************
*                                               HOOK Task Idle
*
* Description: This function is called before CPU goes STOP.
*              in OS versions starting from 2.51.
*
* Arguments  : none
*
*********************************************************************************************************
*/
void OSTaskIdleHook (void)
{
}
#endif