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https://github.com/mengning/mykernel
mykernel 2.0: Develop your own OS kernel by reusing Linux infrastructure, based on x86-64/Linux Kernel 5.4.34.
https://github.com/mengning/mykernel
Last synced: 3 months ago
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mykernel 2.0: Develop your own OS kernel by reusing Linux infrastructure, based on x86-64/Linux Kernel 5.4.34.
- Host: GitHub
- URL: https://github.com/mengning/mykernel
- Owner: mengning
- License: gpl-2.0
- Created: 2013-06-26T04:47:42.000Z (over 11 years ago)
- Default Branch: master
- Last Pushed: 2024-03-21T02:16:57.000Z (8 months ago)
- Last Synced: 2024-07-16T12:01:24.236Z (4 months ago)
- Language: C
- Homepage:
- Size: 14.8 MB
- Stars: 702
- Watchers: 60
- Forks: 347
- Open Issues: 12
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# Welcome to the mykernel 2.0
Develop your own OS kernel by reusing Linux infrastructure, based on x86-64/Linux Kernel 5.4.34.
[mykernel 1.0](https://github.com/mengning/mykernel/tree/cc6f687daaa831a350f3022853825ebe8d78aa2f) based on IA32/Linux Kernel 3.9.4.
## Set up mykernel 2.0 in Ubuntu 18.04/20.04
[Ubuntu22.04版本编译时遇到兼容性问题解决方案](https://github.com/mengning/mykernel/issues/22)
```
wget https://raw.github.com/mengning/mykernel/master/mykernel-2.0_for_linux-5.4.34.patch
sudo apt install axel
axel -n 20 https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/linux-5.4.34.tar.xz
xz -d linux-5.4.34.tar.xz
tar -xvf linux-5.4.34.tar
cd linux-5.4.34
patch -p1 < ../mykernel-2.0_for_linux-5.4.34.patch
sudo apt install build-essential libncurses-dev bison flex libssl-dev libelf-dev
make defconfig # Default configuration is based on 'x86_64_defconfig'
# 使用allnoconfig编译出来qemu无法加载启动，不知道为什么？有明白的告诉我，完整编译太慢了，消耗的资源也多。
make -j$(nproc) # 编译的时间比较久哦
sudo apt install qemu # install QEMU
qemu-system-x86_64 -kernel arch/x86/boot/bzImage
```
感谢meilihao 提交了pr [#14](https://github.com/mengning/mykernel/pull/14) ，通过如下方法可以解决allnoconfig编译出来qemu无法加载启动的问题
```
$ make allnoconfig
$ make menuconfig
General setup ---> Configure standard kernel features ---> Enable support for printk ---> yes
64-bit kernel ---> yes # 如果不需要64bit支持, 这个也可不要
Device Drivers ---> Character devices ---> Enable TTY ---> yes
```
从qemu窗口中您可以看到my_start_kernel在执行，同时my_timer_handler时钟中断处理程序周期性执行。
进入mykernel目录您可以看到qemu窗口输出的内容的代码mymain.c和myinterrupt.c。当前有一个CPU执行C代码的上下文环境，同时具有中断处理程序的上下文环境，我们通过Linux内核代码模拟了一个具有时钟中断和C代码执行环境的硬件平台。
您只要在mymain.c基础上继续写进程描述PCB和进程链表管理等代码，在myinterrupt.c的基础上完成进程切换代码，一个可运行的小OS kernel就完成了。start to write your own OS kernel, enjoy it!
+ mykernel-2.0 patch generated by this command:
+ diff -Naur linux-5.4.34 linux-5.4.34-mykernel > mykernel-2.0_for_linux-5.3.34.patch
## your own OS kernel example code
* mypcb.h、mymain.c和myinterrupt.c实现了一个简单的时间片轮转调度进程的精简内核，如下为进程上下文切换的关键代码（[视频讲解](https://mp.weixin.qq.com/s/SzpN1BNty5aPDZhNdCO5yA)）:
```
printk(KERN_NOTICE ">>>switch %d to %d<<<\n",prev->pid,next->pid);
/* switch to next process */
asm volatile(
"pushq %%rbp\n\t" /* save rbp of prev */
"movq %%rsp,%0\n\t" /* save rsp of prev */
"movq %2,%%rsp\n\t" /* restore rsp of next */
"movq $1f,%1\n\t" /* save rip of prev */
"pushq %3\n\t"
"ret\n\t" /* restore rip of next */
"1:\t" /* next process start here */
"popq %%rbp\n\t"
: "=m" (prev->thread.sp),"=m" (prev->thread.ip)
: "m" (next->thread.sp),"m" (next->thread.ip)
);
```
* 这里的进程切换也仅仅是一种参考x86 Linux内核3.18.6的实现，而Linux内核中进程切换的实现经过了复杂的演化，参考[Evolution of the x86 context switch in Linux](https://www.maizure.org/projects/evolution_x86_context_switch_linux/)
## Comments
* mykernel这样一个短小精悍的模拟内核，时常给我提供了看问题的角度和思路。当被庞杂的Linux内核代码弄得一头雾水时，我就去看看mykernel，很多复杂的问题就可以用简单的机制解释。——[pianogirl](http://blog.csdn.net/pianogirl123/article/details/51287024)
# 采用mykernel的课程和项目
* [庖丁解牛Linux内核MOOC课程](https://mooc.study.163.com/course/1000072000?_trace_c_p_k2_=12d5497350df49e2a6e3878d1a5aa5ae&share=2&shareId=1000001002#/info) - 国家精品在线开放课程
* [kernel-in-kernel](https://github.com/jserv/kernel-in-kernel)
* [操作系统导论](https://github.com/mengning/linuxkernel)
* [《庖丁解牛Linux内核分析》](https://j.youzan.com/pfzVI9)
## Licensing
under GNU GPL v2, or Contact us