From mboxrd@z Thu Jan  1 00:00:00 1970
Subject: Re: -__PAGE_OFFSET
References: <20010920065444.10415.qmail@mailweb13.rediffmail.com>
From: ebiederm@xmission.com (Eric W. Biederman)
Date: 20 Sep 2001 02:54:10 -0600
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To: amey d inamdar <iamey@rediffmail.com>
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"amey d inamdar" <iamey@rediffmail.com> writes:

> Hello everybody,
>      While running through source of 2.4 kernel, in head.S, I found the 
> line
> 86 :   movl $pg0-__PAGE_OFFSET,%edi
> 
>     I am not getting, at this point there is no virtual address & $pg0 
> itself contains physical address of first page table, then why to 
> subtract 3GB from the physical address?

The linker doesn't know the page tables haven't been setup yet.
Look at the addresses in System.map.

>       Thanx in anticipation.

Welcome.

Eric
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