linux-kernel - Re: [PATCH 1/7] x86/boot: adding hw subarch ID for Moorestown

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Date:	Sat, 29 Aug 2009 18:58:01 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"Pan, Jacob jun" <jacob.jun.pan@...el.com>
cc:	LKML <linux-kernel@...r.kernel.org>, x86 team <x86@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Arjan van de Veen <arjan@...radead.org>,
	Avi Kivity <avi@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Alok N Kataria <akataria@...are.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>
Subject: Re: [PATCH 1/7] x86/boot: adding hw subarch ID for Moorestown

On Fri, 28 Aug 2009, Pan, Jacob jun wrote:
> >From 2de4f68e7b0403bb39954d7c2e3d5097d0e6e3ac Mon Sep 17 00:00:00 2001
> From: Jacob Pan <jacob.jun.pan@...el.com>
> Date: Thu, 11 Jun 2009 20:34:47 -0700
> Subject: [PATCH] x86/boot: adding hw subarch ID for Moorestown
> 
> x86 bootprotocol 2.07 has introduced hardware_subarch ID in the boot
> parameters provided by FW. We use it to identify Moorestown platforms.
> 
> The subarchitecture ID will help select a set of platform features and
> x86_quirks.
> 
> Signed-off-by: Jacob Pan <jacob.jun.pan@...el.com>
> ---
>  Documentation/x86/boot.txt       |    1 +
>  arch/x86/include/asm/bootparam.h |   11 +++++++++++
>  2 files changed, 12 insertions(+), 0 deletions(-)
> 
> diff --git a/Documentation/x86/boot.txt b/Documentation/x86/boot.txt
> index 8da3a79..30b43e1 100644
> --- a/Documentation/x86/boot.txt
> +++ b/Documentation/x86/boot.txt
> @@ -599,6 +599,7 @@ Protocol:	2.07+
>    0x00000000	The default x86/PC environment
>    0x00000001	lguest
>    0x00000002	Xen
> +  0x00000003	Moorestown MID
>  
>  Field name:	hardware_subarch_data
>  Type:		write (subarch-dependent)
> diff --git a/arch/x86/include/asm/bootparam.h b/arch/x86/include/asm/bootparam.h
> index 1724e8d..631cae9 100644
> --- a/arch/x86/include/asm/bootparam.h
> +++ b/arch/x86/include/asm/bootparam.h
> @@ -109,4 +109,15 @@ struct boot_params {
>  	__u8  _pad9[276];				/* 0xeec */
>  } __attribute__((packed));
>  
> +#define N_X86_SUBARCHS			4

Grr.

> +enum {
> +	X86_SUBARCH_PC = 0,
> +	X86_SUBARCH_LGUEST,
> +	X86_SUBARCH_XEN,
> +	X86_SUBARCH_MRST,

  	X86_NR_SUBARCHS,

perhaps ?

Also this patch will result in boot failure when paravirt is
enabled. head_32.S wants to be tweaked as well.

Thanks,

	tglx
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