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From: Andreas Schwab <schwab@suse.de>
To: "Ahmed S. Darwish" <darwish.07@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [i386] Questions regarding provisional page tables initialization
Date: Mon, 02 Jul 2007 00:02:27 +0200	[thread overview]
Message-ID: <jed4zbeqa4.fsf@sykes.suse.de> (raw)
In-Reply-To: <20070701203833.GA3498@Ahmed> (Ahmed S. Darwish's message of "Sun\, 1 Jul 2007 23\:38\:33 +0300")

"Ahmed S. Darwish" <darwish.07@gmail.com> writes:

>         page_pde_offset = (__PAGE_OFFSET >> 20)
> 	movl %ecx,(%edx)			/* Store identity PDE entry */
> 	movl %ecx,page_pde_offset(%edx)		/* Store kernel PDE entry */
>
> Why the pde_offset is PAGE_OFFSET >> 20 instead of PAGE_OFFSET >> 22 ?
> * 22 to right shift the whole page_shift (12) and pgdir_shift (10) bits.

4 is the element size.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
PGP key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

  reply	other threads:[~2007-07-01 22:02 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-07-01 20:38 Ahmed S. Darwish
2007-07-01 22:02 ` Andreas Schwab [this message]
2007-07-01 22:19 ` Jeremy Fitzhardinge
2007-07-02  1:13   ` Ahmed S. Darwish
2007-07-02  9:18     ` Andreas Schwab
2007-07-02 10:23       ` Ahmed S. Darwish
2007-07-02 11:34         ` Brian Gerst
2007-07-02 15:43           ` Ahmed S. Darwish
2007-07-02 10:43 ` Andi Kleen

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