linux-kernel - Re: [PATCH v4, REBASED 1/2] ARM: Pass IFSR register to do

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Message-ID: <cc557aab0909230448r6a4ff709k8720155d9389ceae@mail.gmail.com>
Date:	Wed, 23 Sep 2009 14:48:16 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	linux-arm-kernel@...ts.infradead.org,
	Russell King <linux@....linux.org.uk>
Cc:	linux-kernel@...r.kernel.org,
	Bityutskiy Artem <Artem.Bityutskiy@...ia.com>,
	Koskinen Aaro <aaro.koskinen@...ia.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>
Subject: Re: [PATCH v4, REBASED 1/2] ARM: Pass IFSR register to 
	do_PrefetchAbort()

On Tue, Sep 22, 2009 at 2:00 PM, Kirill A. Shutemov
<kirill@...temov.name> wrote:
> Instruction fault status register, IFSR, was introduced on ARMv6 to
> provide status information about the last insturction fault. It
> needed for proper prefetch abort handling.
>
> Now we have three prefetch abort model:
>
>  * legacy - for CPUs before ARMv6. They doesn't provide neither
>    IFSR nor IFAR. We simulate IFSR with section translation fault
>    status for them to generalize code;
>  * ARMv6 - provides IFSR, but not IFAR;
>  * ARMv7 - provides both IFSR and IFAR.
>
> Signed-off-by: Kirill A. Shutemov <kirill@...temov.name>

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