linux-kernel - Re: [i386] Questions regarding provisional page tables initialization

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Message-ID: <4688E2BC.9060908@didntduck.org>
Date:	Mon, 02 Jul 2007 07:34:20 -0400
From:	Brian Gerst <bgerst@...ntduck.org>
To:	"Ahmed S. Darwish" <darwish.07@...il.com>
CC:	Andreas Schwab <schwab@...e.de>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [i386] Questions regarding provisional page tables initialization

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
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