It is a platform to write your own OS kernel,its based on Linux Kernel 3.9.4 source code.
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README.md

Welcome to the mykernel!

It is a platform to write your own OS kernel,its based on Linux Kernel 3.9.4 source code.

  • Set up this platform

    • sudo apt-get install qemu # install QEMU
    • sudo ln -s /usr/bin/qemu-system-i386 /usr/bin/qemu
    • wget https://www.kernel.org/pub/linux/kernel/v3.x/linux-3.9.4.tar.xz # download Linux Kernel 3.9.4 source code
    • wget https://raw.github.com/mengning/mykernel/master/mykernel_for_linux3.9.4sc.patch # download mykernel_for_linux3.9.4sc.patch
    • xz -d linux-3.9.4.tar.xz
    • tar -xvf linux-3.9.4.tar
    • cd linux-3.9.4
    • patch -p1 < ../mykernel_for_linux3.9.4sc.patch
    • make allnoconfig
    • make
    • qemu -kernel arch/x86/boot/bzImage 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。
    • cd mykernel 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,我们初始化好了系统环境。
    • 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 patch generated by this command:

    • diff -Naur linux-3.9.4 linux-3.9.4.new/ > mykernel_for_linux3.9.4sc.patch

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

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