linux-kernel - Re: [PATCH] powerpc/8xx: add system_reset

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Date:   Tue, 06 Sep 2016 17:40:26 -0500
From:   Scott Wood <oss@...error.net>
To:     Christophe Leroy <christophe.leroy@....fr>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] powerpc/8xx: add system_reset_exception

On Mon, 2016-09-05 at 08:42 +0200, Christophe Leroy wrote:
> When the watchdog is in NMI mode, the system reset interrupt is
> generated when the watchdog counter expires.
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
> ---
>  arch/powerpc/kernel/head_8xx.S | 2 +-
>  arch/powerpc/kernel/traps.c    | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
> index 43ddaae..f7b8007 100644
> --- a/arch/powerpc/kernel/head_8xx.S
> +++ b/arch/powerpc/kernel/head_8xx.S
> @@ -227,7 +227,7 @@ i##n:							
> 	\
>  			  ret_from_except)
>  
>  /* System reset */
> -	EXCEPTION(0x100, Reset, unknown_exception, EXC_XFER_STD)
> +	EXCEPTION(0x100, Reset, system_reset_exception, EXC_XFER_STD)

Does this do anything useful beyond what unknown_exception does?  Do you plan
to have a ppc_md.system_reset_exception callback?

-Scott