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在LiteOS-M应用程序中,系统初始化如下:
/** * @brief This is the ohos entry, and you could call this in your main funciton after the * necessary hardware has been initialized. */ void OHOS_Boot(void) { UINT32 ret; ret = LOS_KernelInit(); //初始化内核 if (ret == LOS_OK) { ... LOS_Start(); //启动内核任务调度 } return; // and should never come here }
/***************************************************************************** Function : LOS_KernelInit Description : System kernel initialization function, configure all system modules Input : None Output : None Return : LOS_OK on success or error code on failure *****************************************************************************/ LITE_OS_SEC_TEXT_INIT UINT32 LOS_KernelInit(VOID) { UINT32 ret; PRINTK("entering kernel init...\n"); #if (LOSCFG_BACKTRACE_TYPE != 0) //LOSCFG_XXX 宏定义为make menuconfig生成的宏 OsBackTraceInit(); //函数目前用于初始化内存泄漏检查钩子,栈回溯功能 #endif #ifdef LOSCFG_KERNEL_LMS OsLmsInit(); //初始化 LMS全称为Lite Memory Sanitizer,是一种实时检测内存操作合法性的调测工具 #endif ret = OsMemSystemInit(); //系统堆内存初始化 if (ret != LOS_OK) { PRINT_ERR("OsMemSystemInit error %d\n", ret); return ret; } ArchInit(); //CPU中断向量表初始化,中断接管 ret = OsTickTimerInit(); //系统Tick时钟初始化 if (ret != LOS_OK) { PRINT_ERR("OsTickTimerInit error! 0x%x\n", ret); return ret; } ret = OsTaskInit(); //系统任务初始化,申请控制块内存,初始化就绪链表,自动删除链表 if (ret != LOS_OK) { PRINT_ERR("OsTaskInit error\n"); return ret; } #if (LOSCFG_BASE_CORE_TSK_MONITOR == 1) OsTaskMonInit(); //任务监控初始化 #endif #if (LOSCFG_BASE_CORE_CPUP == 1) ret = OsCpupInit(); //初始化CPU占空比监控 if (ret != LOS_OK) { PRINT_ERR("OsCpupInit error\n"); return ret; } #endif #if (LOSCFG_BASE_IPC_SEM == 1) ret = OsSemInit(); //信号量初始化 if (ret != LOS_OK) { return ret; } #endif #if (LOSCFG_BASE_IPC_MUX == 1) ret = OsMuxInit(); //互斥锁初始化 if (ret != LOS_OK) { return ret; } #endif #if (LOSCFG_BASE_IPC_QUEUE == 1) ret = OsQueueInit(); //消息队列初始化 if (ret != LOS_OK) { PRINT_ERR("OsQueueInit error\n"); return ret; } #endif #if (LOSCFG_BASE_CORE_SWTMR == 1) ret = OsSwtmrInit(); //软件定时器初始化 if (ret != LOS_OK) { PRINT_ERR("OsSwtmrInit error\n"); return ret; } #endif #if (LOSCFG_CPUP_INCLUDE_IRQ == 1) ret = OsCpupDaemonInit(); //CPU占空比守护进程 if (ret != LOS_OK) { PRINT_ERR("OsCpupDaemonInit error\n"); return ret; } #endif #if (LOSCFG_FS_VFS == 1) ret = OsVfsInit(); //文件系统初始化 if (ret != LOS_OK) { PRINT_ERR("OsVfsInit error\n"); return ret; } #endif ret = OsIdleTaskCreate(); //创建idle进程 if (ret != LOS_OK) { return ret; } #if (LOSCFG_KERNEL_TRACE == 1) ret = OsTraceInit(); //系统跟踪初始化 if (ret != LOS_OK) { PRINT_ERR("OsTraceInit error\n"); return ret; } #endif #if (LOSCFG_KERNEL_PM == 1) ret = OsPmInit(); //电源控制初始化 if (ret != LOS_OK) { PRINT_ERR("Pm init failed!\n"); return ret; } #endif #if (LOSCFG_KERNEL_LMK == 1) OsLmkInit(); //低内存自动Kill框架 #endif #if (LOSCFG_PLATFORM_EXC == 1) OsExcMsgDumpInit(); //信号获取初始化 #endif #if (LOSCFG_DYNLINK == 1) ret = LOS_DynlinkInit(); //动态链接 if (ret != LOS_OK) { return ret; } #endif #if (LOSCFG_POSIX_PIPE_API == 1) ret = OsPipeInit(); //Pipe初始化 if (ret != LOS_OK) { PRINT_ERR("Pipe init failed!\n"); return ret; } #endif #if (LOSCFG_KERNEL_SIGNAL == 1) ret = OsSignalInit(); //信号初始化 if (ret != LOS_OK) { PRINT_ERR("Signal init failed!\n"); return ret; } #endif #if (LOSCFG_SECURE == 1) OsSyscallHandleInit(); //系统调用 LOS_BoxStart(); //创建BOX用户任务 #endif return LOS_OK; }
LOS_KernelInit函数中初始化的系统模块,多数可以根据内核配置进行增减,在lite-m目录下使用make menuconfig进行配置。
LITE_OS_SEC_TEXT_INIT UINT32 LOS_Start(VOID)
{
return ArchStartSchedule(); //启动任务调度
}
由于系统任务管理、调度算法,会涉及芯片平台的中断开关、任务上下文切换等,因此,下一篇文章先分析SOC Cortex-m4启动代码适配。
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