os_cpu_c.c

Renesas(Hitachi SuperH)SH7708的UCOS2源码,uC/OS-II 版本2.52.

/*
*********************************************************************************************************
*                                               uC/OS-II
*                                         The Real-Time Kernel
*
*                        (c) Copyright 1992-1998, Jean J. Labrosse, Plantation, FL
*                                          All Rights Reserved
*
*
*                                       Hitachi SH3
*
*
* File : OS_CPU_C.C
* By : Kuan, Yeou-Fuh
*********************************************************************************************************
*/

#define  OS_CPU_GLOBALS
#include "includes.h"

#define SR_STARTUP_INTS_ON      0x60000000
#define SR_STARTUP_INTS_OFF     0x600000F0

/* Variable to store current interrupt level */
INT32U vect_level;

/*
*********************************************************************************************************
*                                        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().
*
*
* 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);
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) SR_STARTUP_INTS_ON;    /* SSR  */
    *--stk = (INT32U) task;                  /* SPC  */
    *--stk = 0L;                             /* macl */
    *--stk = 0L;                             /* mach */
    *--stk = 0L;                             /* gbr  */
    *--stk = 0L;                             /* pr   */
    *--stk = 0L;                             /* r0   */
    *--stk = 0L;                             /* r1   */
    *--stk = 0L;                             /* r2   */
    *--stk = 0L;                             /* r3   */
    *--stk = (INT32U) pdata;                 /* pass pdata in register r4 */
    *--stk = 0L;                             /* r5   */
    *--stk = 0L;                             /* r6   */
    *--stk = 0L;                             /* r7   */
    *--stk = 0L;                             /* r8   */
    *--stk = 0L;                             /* r9   */
    *--stk = 0L;                             /* r10  */
    *--stk = 0L;                             /* r11  */
    *--stk = 0L;                             /* r12  */
    *--stk = 0L;                             /* r13  */
    *--stk = 0L;                             /* r14  */

    return ((void *)stk);
}

#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)
{
}

void OSTaskIdleHook(void)
{
}
void OSInitHookBegin(void)
{
}

void OSInitHookEnd(void)
{
}
void OSTCBInitHook(OS_TCB *ptcb)
{
    ptcb = ptcb;                       /* Prevent compiler warning                                     */
}


#endif