system call

[Nitin Varyani]

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.

Nitin
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