Hi,

      I want to implement a system call as explained in Linux kernel development by Robert Love.

He does three things

 adding entry to entry.S

adding entry to asm/unistd.h

and adding the system call code to sched.c

and then make + make install

I do not want to implement for all architectures but only for my PC which is 64 bit. I am not able to locate files entry. S and unistd.h which he is telling in his tutorial. 

Please help me out to figure out the exact steps. Please also mention the linux kernel version I should use.