where is __setup_start?

[Om <omanakuttan@xxxxxxx>]

while going through the code of parse_options() (init/main.c) I found it 
is calling checksetup(). This function is using

struct kernel_param *p;

p = &__setup_start ;

I who creates __setup_start? I saw in arch/i386/vmlinux.lds (linker 
script) the following

  __setup_start = .;
  .setup.init : { *(.setup.init) }
  __setup_end = .;

I coudl not make much out of this. Any pointers/explanations?

Regards,
om.

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