📄 os_cpu_c.c
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/****************************************Copyright (c)**************************************************
********************************************************************************************************/
#define OS_CPU_GLOBALS
#include "config.h"
/*********************************************************************************************************
** 函数名称: OSTaskStkInit
** 功能描述: 任务堆栈初始化代码，本函数调用失败会使系统崩溃
********************************************************************************************************/
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 = (OS_STK) task; /* lr */
*--stk = 0; /* r12 */
*--stk = 0; /* r11 */
*--stk = 0; /* r10 */
*--stk = 0; /* r9 */
*--stk = 0; /* r8 */
*--stk = 0; /* r7 */
*--stk = 0; /* r6 */
*--stk = 0; /* r5 */
*--stk = 0; /* r4 */
*--stk = 0; /* r3 */
*--stk = 0; /* r2 */
*--stk = 0; /* r1 */
*--stk = (unsigned int) pdata; /* r0,第一个参数使用R0传递 */
*--stk = (USER_USING_MODE|0x00); /* spsr，允许 IRQ, FIQ 中断 */
*--stk = 0; /* 关中断计数器OsEnterSum; */
return (stk);
}
/*********************************************************************************************************
** 函数名称: SWI_Exception
** 功能描述: 软中断异常处理程序，提供一些系统服务
********************************************************************************************************/
#if OS_SELF_EN > 0
extern int const _OSFunctionAddr[];
extern int const _UsrFunctionAddr[];
#endif
void SWI_Exception(int SWI_Num, int *Regs)
{
OS_TCB *ptcb;
switch(SWI_Num)
{
//case 0x00: /* 任务切换函数OS_TASK_SW，参考os_cpu_s.s文件 */
// break;
//case 0x01: /* 启动任务函数OSStartHighRdy，参考os_cpu_s.s文件 */
// break;
case 0x02: /* 关中断函数OS_ENTER_CRITICAL()，参考os_cpu.h文件 */
__asm
{
MRS R0, SPSR
ORR R0, R0, #NoInt
MSR SPSR_c, R0
}
OsEnterSum++;
break;
case 0x03: /* 开中断函数OS_EXIT_CRITICAL()，参考os_cpu.h文件 */
if (--OsEnterSum == 0)
{
__asm
{
MRS R0, SPSR
BIC R0, R0, #NoInt
MSR SPSR_c, R0
}
}
break;
#if OS_SELF_EN > 0
case 0x40:
/* 返回指定系统服务函数的地址 */
/* 函数地址存于数组_OSFunctionAddr中*/
/* 数组_OSFunctionAddr需要另外定义 */
/* Regs[0] 为第一个参数，也是返回值 */
/* Regs[1] 为第二个参数 */
/* Regs[2] 为第三个参数 */
/* Regs[3] 为第四个参数 */
/* 仅有一个参数为系统服务函数的索引 */
Regs[0] = _OSFunctionAddr[Regs[0]];
break;
case 0x41:
/* 返回指定用户的服务函数的地址 */
/* 函数地址存于数组_UsrFunctionAddr中*/
/* 数组_UsrFunctionAddr需要另外定义 */
/* Regs[0] 为第一个参数，也是返回值 */
/* Regs[1] 为第二个参数 */
/* Regs[2] 为第三个参数 */
/* Regs[3] 为第四个参数 */
/* 仅有一个参数为用户服务函数的索引 */
Regs[0] = _UsrFunctionAddr[Regs[0]];
break;
case 0x42: /* 中断开始处理 */
OSIntNesting++;
break;
case 0x43: /* 判断中断是否需要切换 */
if (OSTCBHighRdy == OSTCBCur)
{
Regs[0] = 0;
}
else
{
Regs[0] = 1;
}
break;
#endif
case 0x80: /* 任务切换到系统模式 */
__asm
{
MRS R0, SPSR
BIC R0, R0, #0x1f
ORR R0, R0, #SYS32Mode
MSR SPSR_c, R0
}
break;
case 0x81: /* 任务切换到用户模式 */
__asm
{
MRS R0, SPSR
BIC R0, R0, #0x1f
ORR R0, R0, #USR32Mode
MSR SPSR_c, R0
}
break;
case 0x82: /* 任务是ARM代码 */
if (Regs[0] <= OS_LOWEST_PRIO)
{
ptcb = OSTCBPrioTbl[Regs[0]];
if (ptcb != NULL)
{
ptcb -> OSTCBStkPtr[1] &= ~(1 << 5);
}
}
break;
case 0x83: /* 任务是THUMB代码 */
if (Regs[0] <= OS_LOWEST_PRIO)
{
ptcb = OSTCBPrioTbl[Regs[0]];
if (ptcb != NULL)
{
ptcb -> OSTCBStkPtr[1] |= (1 << 5);
}
}
break;
default:
break;
}
}
/*********************************************************************************************************
** 函数名称: OSStartHighRdy
** 功能描述: uC/OS-II启动时使用OSStartHighRdy运行第一个任务,
** 实质是产生swi 1指令
********************************************************************************************************/
void OSStartHighRdy(void)
{
_OSStartHighRdy();
}
/* 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
********************************************************************************************************/
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