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From: Brian Gerst <bgerst@didntduck.org>
To: "Ahmed S. Darwish" <darwish.07@gmail.com>
Cc: Andreas Schwab <schwab@suse.de>,
	Jeremy Fitzhardinge <jeremy@goop.org>,
	linux-kernel@vger.kernel.org
Subject: Re: [i386] Questions regarding provisional page tables initialization
Date: Mon, 02 Jul 2007 07:34:20 -0400
Message-ID: <4688E2BC.9060908@didntduck.org> (raw)
In-Reply-To: <20070702102303.GA17533@Ahmed>

Ahmed S. Darwish wrote:
> now back to head.S code:
>  	leal    0x007(%edi),%ecx	/* Create PDE entry */
> 
> Isn't the above line the same condition (bytes, not bits displacement) ?. 
> Thanks for your patience !.

The leal instruction (Load Effective Address) is often used as a way to
add a constant to one register and store the result in another register
in a single instruction.  The values don't even have to be addresses at
all, since no memory is actually referenced.  Otherwise this would be
written as:

	movl %edi,%ecx
	addl $0x007, %ecx

--
				Brian Gerst

  reply index

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
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 [this message]
2007-07-02 15:43           ` Ahmed S. Darwish
2007-07-02 10:43 ` Andi Kleen

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