os_core.c

用于使用S3C44B0x开发的人员移植uCOS-

                    OS_TASK_IDLE_STK_SIZE, 
                    (void *)0,                                 /* No TCB extension                     */
                    OS_TASK_OPT_STK_CHK | OS_TASK_OPT_STK_CLR);/* Enable stack checking + clear stack  */
    #else
    OSTaskCreate(OSTaskIdle, (void *)0, &OSTaskIdleStk[OS_TASK_IDLE_STK_SIZE - 1], OS_IDLE_PRIO);
    #endif
#else
    #if OS_TASK_CREATE_EXT_EN
    OSTaskCreateExt(OSTaskIdle, 
                    (void *)0,                                 /* No arguments passed to OSTaskIdle()  */
                    &OSTaskIdleStk[0],                         /* Set Top-Of-Stack                     */
                    OS_IDLE_PRIO,                              /* Lowest priority level                */
                    OS_TASK_IDLE_ID,
                    &OSTaskIdleStk[OS_TASK_IDLE_STK_SIZE - 1], /* Set Bottom-Of-Stack                  */
                    OS_TASK_IDLE_STK_SIZE, 
                    (void *)0,                                 /* No TCB extension                     */
                    OS_TASK_OPT_STK_CHK | OS_TASK_OPT_STK_CLR);/* Enable stack checking + clear stack  */
    #else
    OSTaskCreate(OSTaskIdle, (void *)0, &OSTaskIdleStk[0], OS_IDLE_PRIO);
    #endif
#endif

#if OS_TASK_STAT_EN 
    #if OS_TASK_CREATE_EXT_EN
        #if OS_STK_GROWTH == 1
        OSTaskCreateExt(OSTaskStat, 
                        (void *)0,                                /* No args passed to OSTaskStat()    */
                        &OSTaskStatStk[OS_TASK_STAT_STK_SIZE - 1],/* Set Top-Of-Stack                  */
                        OS_STAT_PRIO,                             /* One higher than the idle task     */
                        OS_TASK_STAT_ID,
                        &OSTaskStatStk[0],                        /* Set Bottom-Of-Stack               */
                        OS_TASK_STAT_STK_SIZE, 
                        (void *)0,                                /* No TCB extension                  */
                        OS_TASK_OPT_STK_CHK | OS_TASK_OPT_STK_CLR);  /* Enable stack checking + clear  */
        #else
        OSTaskCreateExt(OSTaskStat, 
                        (void *)0,                                /* No args passed to OSTaskStat()    */
                        &OSTaskStatStk[0],                        /* Set Top-Of-Stack                  */
                        OS_STAT_PRIO,                             /* One higher than the idle task     */
                        OS_TASK_STAT_ID,
                        &OSTaskStatStk[OS_TASK_STAT_STK_SIZE - 1],/* Set Bottom-Of-Stack               */
                        OS_TASK_STAT_STK_SIZE, 
                        (void *)0,                                /* No TCB extension                  */
                        OS_TASK_OPT_STK_CHK | OS_TASK_OPT_STK_CLR);  /* Enable stack checking + clear  */
        #endif
    #else
        #if OS_STK_GROWTH == 1
        OSTaskCreate(OSTaskStat, 
                     (void *)0,                                   /* No args passed to OSTaskStat()    */
                     &OSTaskStatStk[OS_TASK_STAT_STK_SIZE - 1],   /* Set Top-Of-Stack                  */
                     OS_STAT_PRIO);                               /* One higher than the idle task     */
        #else
        OSTaskCreate(OSTaskStat, 
                     (void *)0,                                   /* No args passed to OSTaskStat()    */
                     &OSTaskStatStk[0],                           /* Set Top-Of-Stack                  */
                     OS_STAT_PRIO);                               /* One higher than the idle task     */
        #endif
    #endif
#endif
}
/*$PAGE*/
/*
*********************************************************************************************************
*                                              ENTER ISR
*
* Description: This function is used to notify uC/OS-II that you are about to service an interrupt
*              service routine (ISR).  This allows uC/OS-II to keep track of interrupt nesting and thus
*              only perform rescheduling at the last nested ISR.
*
* Arguments  : none
*
* Returns    : none
*
* Notes      : 1) Your ISR can directly increment OSIntNesting without calling this function because 
*                 OSIntNesting has been declared 'global'.  You MUST, however, be sure that the increment
*                 is performed 'indivisibly' by your processor to ensure proper access to this critical
*                 resource.
*              2) You MUST still call OSIntExit() even though you increment OSIntNesting directly.
*              3) You MUST invoke OSIntEnter() and OSIntExit() in pair.  In other words, for every call
*                 to OSIntEnter() at the beginning of the ISR you MUST have a call to OSIntExit() at the
*                 end of the ISR.
*********************************************************************************************************
*/

void OSIntEnter (void)
{
    OS_ENTER_CRITICAL();
    OSIntNesting++;                              /* Increment ISR nesting level                        */
    OS_EXIT_CRITICAL();
}
/*$PAGE*/
/*
*********************************************************************************************************
*                                               EXIT ISR
*
* Description: This function is used to notify uC/OS-II that you have completed serviving an ISR.  When 
*              the last nested ISR has completed, uC/OS-II will call the scheduler to determine whether
*              a new, high-priority task, is ready to run.
*
* Arguments  : none
*
* Returns    : none
*
* Notes      : 1) You MUST invoke OSIntEnter() and OSIntExit() in pair.  In other words, for every call
*                 to OSIntEnter() at the beginning of the ISR you MUST have a call to OSIntExit() at the
*                 end of the ISR.
*              2) Rescheduling is prevented when the scheduler is locked (see OSSchedLock())
*********************************************************************************************************
*/

void OSIntExit (void)
{
    OS_ENTER_CRITICAL();
    if ((--OSIntNesting | OSLockNesting) == 0) { /* Reschedule only if all ISRs completed & not locked */
        OSIntExitY    = OSUnMapTbl[OSRdyGrp];
        OSPrioHighRdy = (INT8U)((OSIntExitY << 3) + OSUnMapTbl[OSRdyTbl[OSIntExitY]]);
        if (OSPrioHighRdy != OSPrioCur) {        /* No context switch if current task is highest ready */
            OSTCBHighRdy  = OSTCBPrioTbl[OSPrioHighRdy];
            OSCtxSwCtr++;                        /* Keep track of the number of context switches       */
            OSIntCtxSw();                        /* Perform interrupt level context switch             */
        }
    }
    OS_EXIT_CRITICAL();
}

void OSExIntExit (void)
{
    if ((--OSIntNesting | OSLockNesting) == 0) { /* Reschedule only if all ISRs completed & not locked */
        OSIntExitY    = OSUnMapTbl[OSRdyGrp];
        OSPrioHighRdy = (INT8U)((OSIntExitY << 3) + OSUnMapTbl[OSRdyTbl[OSIntExitY]]);
        if (OSPrioHighRdy != OSPrioCur) {        /* No context switch if current task is highest ready */
            OSTCBHighRdy  = OSTCBPrioTbl[OSPrioHighRdy];
            OSCtxSwCtr++;                        /* Keep track of the number of context switches       */
            OSIntCtxSw();                        /* Perform interrupt level context switch             */
        }
    }
}

/*$PAGE*/
/*
*********************************************************************************************************
*                                              SCHEDULER
*
* Description: This function is called by other uC/OS-II services to determine whether a new, high
*              priority task has been made ready to run.  This function is invoked by TASK level code
*              and is not used to reschedule tasks from ISRs (see OSIntExit() for ISR rescheduling).
*
* Arguments  : none
*
* Returns    : none
*
* Notes      : 1) This function is INTERNAL to uC/OS-II and your application should not call it.
*              2) Rescheduling is prevented when the scheduler is locked (see OSSchedLock())
*********************************************************************************************************
*/

void OSSched (void)
{
    INT8U y;


    OS_ENTER_CRITICAL();
    if ((OSLockNesting | OSIntNesting) == 0) {   /* Task scheduling must be enabled and not ISR level  */
        y             = OSUnMapTbl[OSRdyGrp];    /* Get pointer to highest priority task ready to run  */
        OSPrioHighRdy = (INT8U)((y << 3) + OSUnMapTbl[OSRdyTbl[y]]);
        if (OSPrioHighRdy != OSPrioCur) {         /* No context switch if current task is highest ready */
            OSTCBHighRdy = OSTCBPrioTbl[OSPrioHighRdy];
            OSCtxSwCtr++;                        /* Increment context switch counter                   */
            OS_TASK_SW();                        /* Perform a context switch                           */
        }
    }
    OS_EXIT_CRITICAL();
}

void OSIntSched (void)
{
    INT8U y;


    if ((OSLockNesting | OSIntNesting) == 0) {   /* Task scheduling must be enabled and not ISR level  */
        y             = OSUnMapTbl[OSRdyGrp];    /* Get pointer to highest priority task ready to run  */
        OSPrioHighRdy = (INT8U)((y << 3) + OSUnMapTbl[OSRdyTbl[y]]);
        if (OSPrioHighRdy != OSPrioCur) {         /* No context switch if current task is highest ready */
            OSTCBHighRdy = OSTCBPrioTbl[OSPrioHighRdy];
            OSCtxSwCtr++;                        /* Increment context switch counter                   */
            OS_TASK_SW();                        /* Perform a context switch                           */
        }
    }
}

/*$PAGE*/
/*
*********************************************************************************************************
*                                          PREVENT SCHEDULING
*
* Description: This function is used to prevent rescheduling to take place.  This allows your application
*              to prevent context switches until you are ready to permit context switching.
*
* Arguments  : none
*
* Returns    : none
*
* Notes      : 1) You MUST invoke OSSchedLock() and OSSchedUnlock() in pair.  In other words, for every 
*                 call to OSSchedLock() you MUST have a call to OSSchedUnlock().
*********************************************************************************************************
*/

void OSSchedLock (void)
{
    if (OSRunning == TRUE) {                     /* Make sure multitasking is running                  */
        OS_ENTER_CRITICAL();
        OSLockNesting++;                         /* Increment lock nesting level                       */
        OS_EXIT_CRITICAL();
    }
}
/*$PAGE*/
/*
*********************************************************************************************************
*                                          ENABLE SCHEDULING
*
* Description: This function is used to re-allow rescheduling.  
*
* Arguments  : none
*
* Returns    : none
*
* Notes      : 1) You MUST invoke OSSchedLock() and OSSchedUnlock() in pair.  In other words, for every 
*                 call to OSSchedLock() you MUST have a call to OSSchedUnlock().
*********************************************************************************************************
*/

void OSSchedUnlock (void)
{
    if (OSRunning == TRUE) {                           /* Make sure multitasking is running            */
        OS_ENTER_CRITICAL();
        if (OSLockNesting > 0) {                       /* Do not decrement if already 0                */
            OSLockNesting--;                           /* Decrement lock nesting level                 */
            if ((OSLockNesting | OSIntNesting) == 0) { /* See if scheduling re-enabled and not an ISR  */
                OS_EXIT_CRITICAL();
                OSSched();                             /* See if a higher priority task is ready       */
            } else {
                OS_EXIT_CRITICAL();
            }
        } else {
            OS_EXIT_CRITICAL();
        }
    }
}
/*$PAGE*/
/*
*********************************************************************************************************
*                                          START MULTITASKING
*
* Description: This function is used to start the multitasking process which lets uC/OS-II manages the
*              task that you have created.  Before you can call OSStart(), you MUST have called OSInit()
*              and you MUST have created at least one task.
*
* Arguments  : none
*
* Returns    : none
*
* Note       : OSStartHighRdy() MUST:
*                 a) Call OSTaskSwHook() then,
*                 b) Set OSRunning to TRUE.
*********************************************************************************************************
*/

void OSStart (void)
{
    INT8U y;
    INT8U x;


    if (OSRunning == FALSE) {
        y             = OSUnMapTbl[OSRdyGrp];        /* Find highest priority's task priority number   */
        x             = OSUnMapTbl[OSRdyTbl[y]];
        OSPrioHighRdy = (INT8U)((y << 3) + x);
        OSPrioCur     = OSPrioHighRdy;
        OSTCBHighRdy  = OSTCBPrioTbl[OSPrioHighRdy]; /* Point to highest priority task ready to run    */
        OSTCBCur      = OSTCBHighRdy;
        OSStartHighRdy();                            /* Execute target specific code to start task     */
    }
}
/*$PAGE*/
/*
*********************************************************************************************************