os_cpu_c.c.txt

将ucos系统一直到PXA255嵌入式系统板上所需的三个文件

这个是Os_cpu_c.c
/*
*********************************************************************************************************
*                                               uC/OS-II
*                                         The Real-Time Kernel
*
*
*                             (c) Copyright 1992-2005, Micrium, Weston, FL
*                                          All Rights Reserved
*
*                                           Generic ARM Port
*
* File      : Os_cpu_c.c
* By        : Junxiao Gao
*
* For       : ARM7
* Mode      : ARM
*********************************************************************************************************
*/

#define  OS_CPU_GLOBALS
＃i nclude "config.h"


/*********************************************************************************************************
** 函数名称: OSTaskStkInit
** 功能描述: 任务堆栈初始化代码，本函数BPOSTuser_saveblog.aspHTTP/1.0C0?BR>********************************************************************************************************/

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

    opt    = opt;                           /* 'opt'  没有使用。作用是避免编译器警告    */
    stk    = ptos;                          /* 获取堆栈指针                                       */

                                            /* 建立任务环境，ADS1.2使用满递减堆栈       */
    *stk = (OS_STK) task;                   /*  pc  */
    *(--stk) = (INT32U)0x14141414L;         /* R14 (LR)                                                */
    *(--stk) = (INT32U)0x12121212L;         /* R12                                                     */
    *(--stk) = (INT32U)0x11111111L;         /* R11                                                     */
    *(--stk) = (INT32U)0x10101010L;         /* R10                                                     */
    *(--stk) = (INT32U)0x09090909L;         /* R9                                                      */
    *(--stk) = (INT32U)0x08080808L;         /* R8                                                      */
    *(--stk) = (INT32U)0x07070707L;         /* R7                                                      */
    *(--stk) = (INT32U)0x06060606L;         /* R6                                                      */
    *(--stk) = (INT32U)0x05050505L;         /* R5                                                      */
    *(--stk) = (INT32U)0x04040404L;         /* R4                                                      */
    *(--stk) = (INT32U)0x03030303L;         /* R3                                                      */
    *(--stk) = (INT32U)0x02020202L;         /* R2                                                      */
    *(--stk) = (INT32U)0x01010101L;         /* R1                                                      */
    *(--stk) = (INT32U)pdata;               /* R0 : argument                                           */
    *(--stk) = (INT32U)USR32Mode;       /* CPSR  (Enable both IRQ and FIQ interrupts)              */

    return (stk);
}


/* 以下为一些钩子函数，全部为空函数。具体说明请看相关资料 */

#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)
{
}

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


/*
*********************************************************************************************************
*                                             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)
{
}
#endif
#endif
/*********************************************************************************************************
**                            End Of File
********************************************************************************************************/