[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: $var-__PAGE_OFFSET

To: <w.us@verizon.net>
Subject: Re: $var-__PAGE_OFFSET
From: Augusto César Radtke <radtke@conectiva.com>
Date: Sun, 14 Jan 2001 00:22:36 -0200
Cc: kernelnewbies@nl.linux.org
In-Reply-To: <Pine.LNX.4.21.0101131727420.1473-100000@localhost.localdomain>; from w.us@verizon.net on Sat, Jan 13, 2001 at 05:38:31PM -0500
Mail-Followup-To: Augusto César Radtke <radtke@conectiva.com>,<w.us@verizon.net>, kernelnewbies@humbolt.nl.linux.org
References: <Pine.LNX.4.21.0101131727420.1473-100000@localhost.localdomain>
Sender: owner-kernelnewbies@nl.linux.org
User-Agent: Mutt/1.2.5i

w.us@verizon.net wrote:

> 
> Hi,
> 
> Does someone know why we subtract addresses by __PAGE_OFFSET 
> in arch/i386/kernel/head.s on 2.4?
> 
> E.g.:
> movl $pg0-__PAGE_OFFSET,%edi
> cmp $empty_zero_page-__PAGE_OFFSET,%edi
> movl $swapper_pg_dir-__PAGE_OFFSET,%eax
> etc.
	
Generally to align the data on the memory.
	
	Augusto
-
Kernelnewbies: Help each other learn about the Linux kernel.
Archive:       http://mail.nl.linux.org/
IRC Channel:   irc.openprojects.net / #kernelnewbies
Web Page:      http://www.surriel.com/kernelnewbies.shtml

Follow-Ups:
- Re: $var-__PAGE_OFFSET
  - From: <w.us@verizon.net>

References:
- $var-__PAGE_OFFSET
  - From: <w.us@verizon.net>
- $var-__PAGE_OFFSET
  - From: <w.us@verizon.net>

Prev by Date: $var-__PAGE_OFFSET
Next by Date: Re: $var-__PAGE_OFFSET
Prev by thread: $var-__PAGE_OFFSET
Next by thread: Re: $var-__PAGE_OFFSET
Index(es):
- Date
- Thread