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Date: Sat, 23 May 2015 20:36:17 -0700
From: perryh@pluto.rain.com (Perry Hutchison)
To: ps06756@gmail.com
Cc: freebsd-questions@freebsd.org, jd1008@gmail.com
Subject: Re: Map virtual address to physical address
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Pratik Singhal <ps06756@gmail.com> wrote:

> Can you please tell in which header file is it declared ?

find(1) and xargs(1) are your friends:

    find /usr/include /usr/src/sys -type f -name '*.h' -print0 \
    | xargs -0 egrep -i vtop | less

That will give you the correct answer(s) for whichever version of the
source you are working with.  (Shell command and continuation-line
prompts not shown, since they depend on which shell you are using.)