yos's Introduction
kernel.asm为内核入口,入口函数为_start 宏定义包含在与之相关的头文件中, x86.h尽量少包含 全局变量定义在各自的.c文件中，在global.h中声明一下 只能在源文件中包含global.h 头文件中不要包含外部全局变量声明 x86.h中包含其他头文件中没有包含的结构与宏 lib.h中包含内核编写过程中常用的功能函数 type.h中包含了基本数据类型和函数类型的定义 task_TTY主体是一个循环，不停的读取键盘输入，放入指定键盘输入缓冲，然后读取屏幕输出， 问题： 在一个循环中不停的调用系统调用，会导致系统无法响应，可能是中断重入的问题。
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