Kernel_Startup

 Head.S

-->start_kernel

-->rest_init

-->kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND);

-->kernel_init

-->do_basic_setup

-->do_initcalls

-->Loop [do_initcall_level(level);]

   

static void __init do_initcall_level(int level)

{

        extern const struct kernel_param __start___param[], __stop___param[];

        initcall_t *fn;

 

        strcpy(static_command_line, saved_command_line);

        parse_args(initcall_level_names[level],

                   static_command_line, __start___param,

                   __stop___param - __start___param,

                   level, level,

                   repair_env_string);

 

        for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++)

                do_one_initcall(*fn);

}

 

static void __init do_initcalls(void)

{

        int level;

 

        for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++)

                do_initcall_level(level);

}