Kernel command line parameter?

["Chetan Nanda" <chetannanda@xxxxxxxxx>]

Hi All,

I have to pass a new command line parameter to linux kernel at bootup time, I am using Intel x86 machine.

How will I go about this?
I have seen in kernel code many statements like:
__setup("str",fn);

Is statement of this kind is sufficient enough?
How/where (in code) kernel parse these parameters?

Thanks,
Chetan Nanda