reboot system

case:factory reset
Settings/src/com/android/settings/MasterClear.java
    sendBroadcast(new Intent("android.intent.action.MASTER_CLEAR"));

->
frameworks/base/services/java/com/android/server/MasterClearReceiver.java
    RecoverySystem.rebootWipeUserData(context);

->
frameworks/base/core/java/android/os/RecoverySystem.java
    bootCommand(context, "--wipe_data");

->
    PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
    pm.reboot("recovery");

->
frameworks/base/services/java/com/android/server/PowerManagerService.java
    public void reboot(String reason){
        ShutdownThread.reboot(mContext, finalReason, false);
    }

->
frameworks/base/core/java/com/android/internal/app/ShutdownThread.java
    rebootOrShutdown(){
        Power.reboot(reason);
    }

->
frameworks/base/core/java/android/os/Power.java
    rebootNative(reason);

->
frameworks/base/core/jni/anroid_os_Power.cpp
    __reboot(LINUX_REBOOT_MAGIC1, LINUX_REBOOT_MAGIC2, LINUX_REBOOT_CMD_RESTART2, (char*) chars);

->
kernel/kernel/sys.c
    case LINUX_REBOOT_CMD_RESTART2:
        kernel_restart(buffer);
    ->
    machine_restart(cmd);

->
kernel/arch/arm/kernel/process.c
    void arm_machine_restart(char mode, const char *cmd){
        //set flag and reboot
    }