https://blog.csdn.net/fyh2003/article/details/6176393
http://l4hq.org/projects/os/
https://www.twblogs.net/a/5b895a332b71775d1ce15cff/zh-cn
http://www.voidcn.com/article/p-xtlworzx-bo.html
https://wenku.baidu.com/view/90929762caaedd3383c4d311.html
https://blog.csdn.net/yili_xie/article/details/5129469
https://blog.csdn.net/lq50714/article/details/7053493
https://www.cnblogs.com/wi100sh/p/4553087.html
https://zhuanlan.zhihu.com/p/42082173
https://www.zhihu.com/question/40126698
