linux-kernel - Re: [PATCH RFC 2/2] ARM: nommu: remap exception base address to RAM

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Date:   Wed, 14 Dec 2016 00:14:23 +0530
From:   Afzal Mohammed <afzal.mohd.ma@...il.com>
To:     Vladimir Murzin <vladimir.murzin@....com>
Cc:     Russell King <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 2/2] ARM: nommu: remap exception base address to RAM

Hi,

On Tue, Dec 13, 2016 at 09:38:21AM +0000, Vladimir Murzin wrote:
> On 11/12/16 13:12, Afzal Mohammed wrote:

> > this probably would have to be made robust so as to not cause issue on
> > other v7-A's upon trying to do !MMU (this won't affect normal MMU boot),
> > or specifically where security extensions are not enabled. Also effect
> > of hypervisor extension also need to be considered. Please let know if
> > any better ways to handle this.

> You might need to check ID_PFR1 for that.

Had been searching ARM ARM for this kind of a thing, thanks.

> > +#ifdef CONFIG_REMAP_VECTORS_TO_RAM
> > +	mov	r3, #CONFIG_VECTORS_BASE	@ read VECTORS_BASE

> ldr r3,=CONFIG_VECTORS_BASE
> 
> would be more robust. I hit this in [1]
> 
> [1] https://www.spinics.net/lists/arm-kernel/msg546825.html

Russell suggested doing it in paging_init(), then probably assembly
circus can be avoided.

Regards
afzal