It is a platform to write your own OS kernel,its based on Linux Kernel 3.9.4 source code.
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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!
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mykernel patch generated by this command:
- diff -Naur linux-3.9.4 linux-3.9.4.new/ > mykernel_for_linux3.9.4sc.patch