os_cpu_c.c

ucos II操作系统的源代码。程序完整

#define  OS_CPU_GLOBALS
#include "OS_CPU.H"
#include "OS_CFG.H"
#include "..\source\ucos_ii.h"

/*********************
#if      OS_VIEW_MODULE > 0
#include <OS_VIEWc.H>
#include <OS_VIEW.H>
#endif
*************************/
#define  ARM_MODE_ARM     0x00000000
#define  ARM_MODE_THUMB   0x00000020

                                        
#define  ARM_SVC_MODE    (0x00000013L + ARM_MODE_ARM)
/*
*********************************************************************************************************
*                                        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.
* Note(s)    : 1) Interrupts are enabled when your task starts executing.
*              2) All tasks run in SVC mode.
*********************************************************************************************************
*/

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


    opt      = opt;                         /* 'opt' is not used, prevent warning                      */
    stk      = ptos;                        /* Load stack pointer                                      */
    *(stk)   = (OS_STK)task;                /* Entry Point                                             */
    *(--stk) = (INT32U)0x00000000L;         /* R14 (LR)                                                */
    *(--stk) = (INT32U)0x00000000L;         /* R12                                                     */
    *(--stk) = (INT32U)0x00000000L;         /* R11                                                     */
    *(--stk) = (INT32U)0x00000000L;         /* R10                                                     */
    *(--stk) = (INT32U)0x00000000L;         /* R9                                                      */
    *(--stk) = (INT32U)0x00000000L;         /* R8                                                      */
    *(--stk) = (INT32U)0x00000000L;         /* R7                                                      */
    *(--stk) = (INT32U)0x00000000L;         /* R6                                                      */
    *(--stk) = (INT32U)0x00000000L;         /* R5                                                      */
    *(--stk) = (INT32U)0x00000000L;         /* R4                                                      */
    *(--stk) = (INT32U)0x00000000L;         /* R3                                                      */
    *(--stk) = (INT32U)0x00000000L;         /* R2                                                      */
    *(--stk) = (INT32U)0x00000000L;         /* R1                                                      */
    *(--stk) = (INT32U)p_arg;               /* R0 : argument                                           */
    *(--stk) = (INT32U)ARM_SVC_MODE;        /* 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