I'm currently reading Operating System Concepts 7th edition by Silberschartz, Galvin and Gagne. At the end of chapter 2, there is an exercise "Add a system call to the Linux Kernel". Unfortunately, I realized the directory structure that the authors used is completely different with Ubuntu's one. For example, the authors referred to "/usr/src/linux-2.x/include/asm-i386/unistd.h", but on my machine, they are:
And inside this folder, I couldn't find anything called "asm-i386" :(. I wonder is there a documentation specified for Ubuntu? Any suggestion would be greatly appreciated.