os_cpu_c.c

c的源码

/*
**********************************************************************************************
*                                                uC/OS-II
*                                          The Real-Time Kernel
*                              ADSP-21065L SHARC Specific Code version 1.1
*
* File : OS_CPU_C.C
* By   : Bertrand Hurst, Francois Veuve, Cedric Bornand ([e-mail])
*        CETT - MIS
*        Rte de Galilee 15
*        1400 Yverdon
*        Switzerland
**********************************************************************************************
*/
#ifndef  OS_MASTER_FILE
#include "includes.h"
#endif

/**********************************************************************************************************
*                                        INITIALIZE A TASK'S STACK
*
* Description: Called by OSTaskCreate() or OSTaskCreateExt() to initialize a new task's stack
* Arguments  : task    pointer to the task's code
*              pdata   pointer to the user's data for the first execution
*              ptos    pointer to the top of stack
*              opt     specifies otions given by OStaskInit()
* Returns    : 
**********************************************************************************************************/
void *OSTaskStkInit (void (*task)(void *pd), void *pdata, void *ptos, INT16U opt)
{
    INT32U *stk;

    stk = (void*)ptos;
    opt = opt;                         /* Prevent compiler warning */

    *stk-- = (INT32U)0;                /* Previous frame ptr */
    *stk-- = (INT32U)0;                /* Previous PC */
    *stk-- = (INT32U)ptos;             /* Frame ptr */
    *stk-- = (INT32U)(task);           /* PC */

    /* Registers R0 to R15 */
    *stk-- = (INT32U)0;     *stk-- = (INT32U)0;
    *stk-- = (INT32U)0;     *stk-- = (INT32U)0;
    *stk-- = (INT32U)pdata;            /* Ptr to user's data go into R4 (1st func. param.) */
    *stk-- = (INT32U)0;                /* 2nd and 3rd parameters, if needed, go into R8 and R12 */
    *stk-- = (INT32U)0;     *stk-- = (INT32U)0;
    *stk-- = (INT32U)0;     *stk-- = (INT32U)0;
    *stk-- = (INT32U)0;     *stk-- = (INT32U)0;
    *stk-- = (INT32U)0;     *stk-- = (INT32U)0;
    *stk-- = (INT32U)0;     *stk-- = (INT32U)0;

    /* Registers I8 to I15 */
    *stk-- = (INT32U)0;     *stk-- = (INT32U)0;
    *stk-- = (INT32U)0;     *stk-- = (INT32U)0;
    *stk-- = (INT32U)0;     *stk-- = (INT32U)0;
    *stk-- = (INT32U)0;     *stk-- = (INT32U)0;

    /* Registers M8 to M12 */
    *stk-- = (INT32U)0;     *stk-- = (INT32U)0;
    *stk-- = (INT32U)0;     *stk-- = (INT32U)0;
    *stk-- = (INT32U)0;

    /* Registers I0 to I5 */
    *stk-- = (INT32U)0;     *stk-- = (INT32U)0;
    *stk-- = (INT32U)0;     *stk-- = (INT32U)0;
    *stk-- = (INT32U)0;     *stk-- = (INT32U)0;

    /* Registers M0 to M4 */
    *stk-- = (INT32U)0;     *stk-- = (INT32U)0;
    *stk-- = (INT32U)0;     *stk-- = (INT32U)0;
    *stk-- = (INT32U)0;

    /* Registers MRF, MRB, USTAT1, USTAT2 and ASTAT */
    *stk-- = (INT32U)0;     *stk-- = (INT32U)0;
    *stk-- = (INT32U)0;     *stk-- = (INT32U)0;
    *stk-- = (INT32U)0;     *stk-- = (INT32U)0;
    *stk-- = (INT32U)0;     *stk-- = (INT32U)0;
    *stk-- = (INT32U)0;

    return ((void *)stk);
}

/**********************************************************************************************************
*                                          TASK CREATION HOOK
*
* Description: Called when a task is created. May be used to add new features
* Arguments  : ptcb = ptr to the TCB of the newly created task
**********************************************************************************************************/
void OSTaskCreateHook (OS_TCB *ptcb)
{
    ptcb = ptcb;                       /* Prevent compiler warning */
}
/**********************************************************************************************************
*                                           TASK DELETION HOOK
*
* Description: Called when a task is deleted. May be used to add new features
* Arguments  : ptcb = ptr to the TCB of the just deleted task
**********************************************************************************************************/
void OSTaskDelHook (OS_TCB *ptcb)
{
    ptcb = ptcb;                       /* Prevent compiler warning */
}

/**********************************************************************************************************
*                                           TASK SWITCH HOOK
* Description: Called each time a task switch occurs. May be used to add new features
**********************************************************************************************************/
void OSTaskSwHook (void)
{
}

/**********************************************************************************************************
*                                           STATISTIC TASK HOOK
* Description: Called each second by the statistic's task of uC/OS-II. May be used to add new features
**********************************************************************************************************/
void OSTaskStatHook (void)
{
}

/**********************************************************************************************************
*                                               TICK HOOK
* Description: Called each clock's tick.  May be used to add new features
**********************************************************************************************************/
void OSTimeTickHook (void)
{
}

/**************************************** End of file ****************************************************/