two question about vmlinux.lds.S

[cheng long]

Hi, ALL!
I have two questions about the file arch/i386/kernel/vmlinux.lds.S

1. In the file, there are two headers: <asm/thread_info.h> and <asm/page.h>.
  But I can't find the "asm" directory in the "include" directory, why?
2. How does we generate vmlinux.lds from vmlinux.lds.S?

BTW, if here is not appropriate place, would you tell me where I should ask?

Thanks in advance !

Regards,

Cheng