linux-kernel - Re: ioremap_xxx() with EXEC enabled

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Date:	Wed, 30 Jan 2008 18:30:48 +0100
From:	Andi Kleen <ak@...e.de>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	"Huang, Ying" <ying.huang@...el.com>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>, Andi Kleen <ak@...e.de>,
	linux-kernel@...r.kernel.org
Subject: Re: ioremap_xxx() with EXEC enabled

On Wed, Jan 30, 2008 at 07:45:40AM -0800, Arjan van de Ven wrote:
> On Wed, 30 Jan 2008 17:32:10 +0800
> "Huang, Ying" <ying.huang@...el.com> wrote:
> 
> > Hi,
> > 
> > On i386, EFI may need to map EFI runtime code area as EXEC enabled
> > with ioremap(). But, I found that the memory are mapped as EXEC
> > disabled when mapped with ioremap() now. I think we may need a method
> > to map memory area as EXEC enabled with ioremap_xxx(). Some possible
> > interface schemes for mapping as EXEC enabled are as follow:
> > 
> > - Interface scheme 1:
> 
> scheme 3:
> 
> set_memory_x(... )

On i386 EFI is unlikely to be in the direct mapping ...

-Andi

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