📄 os_cpu_c.c
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#define OS_CPU_GLOBALS
#include "uC_OS.h"
/*
********************************************************************************************************
* 函数: OSIntCtxSw.
* 描述: 中断级任务切换,此处并不真正进行任务切换,具体切换在 IRQ 服务程序的汇编返回中.
********************************************************************************************************
*/
/*
********************************************************************************************************
* 函数: OSTaskStkInit.
* 描述: 任务堆栈初始化代码.
* 输入: task : 任务开始执行的地址.
* pdata ：传递给任务的参数.
* ptos ：任务的堆栈开始位置.
* opt ：附加参数，当前版本对于本函数无用，具体意义参见OSTaskCreateExt()的opt参数.
* 输出: 栈顶指针位置.
********************************************************************************************************
*/
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 */
*--stk = (OS_STK) task; /* PC */
*--stk = (OS_STK) task; /* R14 (LR) */
*--stk = 0x12; /* R12 */
*--stk = 0x11; /* R11 */
*--stk = 0x10; /* R10 */
*--stk = 0x09; /* R9 */
*--stk = 0x08; /* R8 */
*--stk = 0x07; /* R7 */
*--stk = 0x06; /* R6 */
*--stk = 0x05; /* R5 */
*--stk = 0x04; /* R4 */
*--stk = 0x03; /* R3 */
*--stk = 0x02; /* R2 */
*--stk = 0x01; /* R1 */
*--stk = (INT32U) pdata; /* R0 第一个参数使用R0传递. */
*--stk = (0x10|0x00); /* CPSR system mode,允许 IRQ.FIQ 中断.*/
*--stk = 0; /* 关中断计数器OsEnterSum. */
return (stk);
}
#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)
{
}
#define OS_SELF_EN 0
#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, #0x80
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, #0x80
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, #0x1f
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, #0x10
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;
}
}
/*
*********************************************************************************************************
* 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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