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 [thread overview]
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
next prev parent reply other threads:[~2007-07-02 12:20 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-01 20:38 [i386] Questions regarding provisional page tables initialization 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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