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

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Message-ID: <cc557aab0909180808p675c182eke41b23019a609b9a@mail.gmail.com>
Date:	Fri, 18 Sep 2009 18:08:55 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Aaro Koskinen <aaro.koskinen@...ia.com>
Cc:	Aaro Koskinen <aakoskin@...ia.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Russell King <linux@....linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Bityutskiy Artem (Nokia-D/Helsinki)" <Artem.Bityutskiy@...ia.com>
Subject: Re: [PATCH 1/2] ARM: Pass IFSR register to do_PrefetchAbort()

On Fri, Sep 18, 2009 at 5:52 PM, Aaro Koskinen <aaro.koskinen@...ia.com> wrote:
> Hello,
>
> Kirill A. Shutemov wrote:
>>>
>>>  #ifdef CONFIG_CPU_PABRT_NOIFAR
>>> -# ifdef CPU_PABORT_HANDLER
>>> +# ifdef CPU_PABORT_HANDLER_IFAR
>>>  #  define MULTI_PABORT 1
>>>  # else
>>> -#  define CPU_PABORT_HANDLER(reg, insn)        mov reg, insn
>>> +#  define CPU_PABORT_HANDLER_IFAR(reg, insn)   mov reg, insn
>>> +#  define CPU_PABORT_HANDLER_IFSR(reg)         mrc p15, 0, reg, cr5,
>>> cr0, 1
>>
>> It's incorrect. We have IFSR only on ARMv7.
>
> It seems my assumption on the availability of that register was wrong, but I
> think it's available at least on ARMv6, and also that IFAR can be
> optional...

I can't find anything in ARMv6-M Architecture Reference Manual by
keywords "ifar" or "ifsr".

>
> A.
>
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