os_cpu_c.c

称植到lpc2124上的UCOS2.85版 是本人初学移植和ARM的成果 可能已有人上传类似的了

/*
*********************************************************************************************************
*                                              uC/OS-II
*                                        The Real-Time Kernel
* 
*                                        Specific code for V2.8x
*
* File     : OS_CPU_C.C
* By       : 风城少主
* 
* Date     : 2008年月1月26日 
*********************************************************************************************************
*/

#define   OS_CPU_GLOBALS
#include "os_cpu.h"
#include "..\Config\os_cfg.h"
#include "..\OSsrc\ucos_ii.h"


#define  ARM_MODE_ARM     0x00000000
#define  ARM_MODE_THUMB   0x00000020

#define  ARM_SYS_MODE     0x0000001FL

/*
*********************************************************************************************************
*                                        LOCAL GLOBAL VARIABLES
*********************************************************************************************************
*/

#if OS_VERSION >= 281 && OS_TMR_EN > 0
static  INT16U  OSTmrCtr;
#endif

/*
*********************************************************************************************************
*                                       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_CPU_HOOKS_EN > 0 && OS_VERSION > 203
void  OSInitHookBegin (void)
{
#if OS_VERSION >= 281 && OS_TMR_EN > 0
    OSTmrCtr = 0;
#endif
}
#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_CPU_HOOKS_EN > 0 && OS_VERSION > 203
void  OSInitHookEnd (void)
{
}
#endif

/*$PAGE*/
/*
*********************************************************************************************************
*                                          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.
*********************************************************************************************************
*/
#if OS_CPU_HOOKS_EN > 0 
void  OSTaskCreateHook (OS_TCB *ptcb)
{
    ptcb = ptcb;                       /* Prevent compiler warning                                     */
}
#endif


/*
*********************************************************************************************************
*                                           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.
*********************************************************************************************************
*/
#if OS_CPU_HOOKS_EN > 0 
void  OSTaskDelHook (OS_TCB *ptcb)
{
    ptcb = ptcb;                       /* Prevent compiler warning                                     */
}
#endif

/*
*********************************************************************************************************
*                                             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_CPU_HOOKS_EN > 0 && OS_VERSION >= 251
void  OSTaskIdleHook (void)
{
}
#endif

/*
*********************************************************************************************************
*                                           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
*********************************************************************************************************
*/

#if OS_CPU_HOOKS_EN > 0 
void  OSTaskStatHook (void)
{
}
#endif

/*$PAGE*/
/*
**********************************************************************************************************
*                                       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
*
*              p_arg         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 the
*                            highest valid address on the stack.
*
*              opt           specifies options that can be used to alter the behavior of OSTaskStkInit().
*                            (see uCOS_II.H for OS_TASK_OPT_???).
*
* 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.
*
* Note(s)    :
**********************************************************************************************************
*/
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)0x14L;               /* R14 (LR)                                                */
    *(--stk) = (INT32U)0x12L;               /* R12                                                     */
    *(--stk) = (INT32U)0x11L;               /* R11                                                     */
    *(--stk) = (INT32U)0x10L;               /* R10                                                     */
    *(--stk) = (INT32U)0x09L;               /* R9                                                      */
    *(--stk) = (INT32U)0x08L;               /* R8                                                      */
    *(--stk) = (INT32U)0x07L;               /* R7                                                      */
    *(--stk) = (INT32U)0x06L;               /* R6                                                      */
    *(--stk) = (INT32U)0x05L;               /* R5                                                      */
    *(--stk) = (INT32U)0x04L;               /* R4                                                      */
    *(--stk) = (INT32U)0x03L;               /* R3                                                      */
    *(--stk) = (INT32U)0x02L;               /* R2                                                      */
    *(--stk) = (INT32U)0x01L;               /* R1                                                      */
    *(--stk) = (INT32U)p_arg;               /* R0 : argument                                           */
    *(--stk) = (INT32U)ARM_SYS_MODE;        /* CPSR  (Enable both IRQ and FIQ interrupts)              */

    if ((INT32U)task & 0x1)                 /* See if task is Thumb mode                               */
    	*stk = ARM_SYS_MODE|ARM_MODE_THUMB; /* If yes, Set the T-bit                                   */

    return (stk);
}

/*$PAGE*/
/*
*********************************************************************************************************
*                                           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).
*********************************************************************************************************
*/
#if (OS_CPU_HOOKS_EN > 0) && (OS_TASK_SW_HOOK_EN > 0)
void  OSTaskSwHook (void)
{
}
#endif

/*
*********************************************************************************************************
*                                           OS_TCBInit() HOOK
*
* Description: This function is called by OS_TCBInit() 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_CPU_HOOKS_EN > 0 && 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.
*********************************************************************************************************
*/
#if (OS_CPU_HOOKS_EN > 0) && (OS_TIME_TICK_HOOK_EN > 0)
void  OSTimeTickHook (void)
{
  #if OS_VERSION >= 281 && OS_TMR_EN > 0
    OSTmrCtr++;
    if (OSTmrCtr >= (OS_TICKS_PER_SEC / OS_TMR_CFG_TICKS_PER_SEC)) {
        OSTmrCtr = 0;
        OSTmrSignal();
    }
  #endif
}
#endif