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

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Date:	Fri, 18 Sep 2009 16:38:18 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
Cc:	Aaro Koskinen <aaro.koskinen@...ia.com>,
	"Bityutskiy Artem (Nokia-D/Helsinki)" <Artem.Bityutskiy@...ia.com>,
	Russell King <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Aaro Koskinen <aakoskin@...ia.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] ARM: Pass IFSR register to do_PrefetchAbort()

On Fri, 2009-09-18 at 18:08 +0300, Kirill A. Shutemov wrote:
> 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".

ARMv6-M is for the M-profile CPUs (Thumb or Thumb-2 only ISA, no MMU ,
it doesn't even have CP15).

You would need to check the A profile. Try the ARMv7-AR reference manual
(now freely available, though it needs a click-through) which has a
section on differences with the ARMv6 as well.

-- 
Catalin

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