From: "Stephen C. Tweedie" <sct@redhat.com>
To: Sanket Rathi <sanket.rathi@cdac.ernet.in>
Cc: linux-mm@kvack.org
Subject: Re: page table entries
Date: Fri, 10 May 2002 10:55:45 +0100 [thread overview]
Message-ID: <20020510105545.A3297@redhat.com> (raw)
In-Reply-To: <Pine.GSO.4.10.10205101049310.14865-100000@mailhub.cdac.ernet.in>; from sanket.rathi@cdac.ernet.in on Fri, May 10, 2002 at 11:00:52AM +0530
Hi,
On Fri, May 10, 2002 at 11:00:52AM +0530, Sanket Rathi wrote:
> The problem is i am not able to understand that why the pgd_val, pmd_val
> and pte_val contain 0x63 in last two positions actually they are page
> address so their last 3 position(in hex) should be zero like in io
> address.
You're actually looking at a pte value, not just an address. The low
12 bits in a pte's contents are not used for addressing but for pte
metadata. In this case, those bits correspond to:
#define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED |
_PAGE_DIRTY)
from linux/include/asm-i386/pgtable.h.
Cheers,
Stephen
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next prev parent reply other threads:[~2002-05-10 9:55 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-05-10 5:30 page table entries Sanket Rathi
2002-05-10 9:55 ` Stephen C. Tweedie [this message]
2002-05-16 11:54 ` Sanket Rathi
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