linux-kernel - Re: [PATCH] Be explicit about what the x86 0x020c boot parameter version requires.

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Message-ID: <1362645561.15011.104.camel@mfleming-mobl1.ger.corp.intel.com>
Date:	Thu, 07 Mar 2013 08:39:21 +0000
From:	Matt Fleming <matt.fleming@...el.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Peter Jones <pjones@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Be explicit about what the x86 0x020c boot parameter
 version requires.

On Wed, 2013-03-06 at 20:31 -0800, H. Peter Anvin wrote:
> On 03/06/2013 10:00 AM, Peter Jones wrote:
> > This should help avoid making the incorrect change in non-compliant
> > bootloaders.
> > 
> > Signed-off-by: Peter Jones <pjones@...hat.com>
> > ---
> >  Documentation/x86/boot.txt             | 5 +++--
> >  arch/x86/include/asm/bootparam_utils.h | 7 +++++++
> >  2 files changed, 10 insertions(+), 2 deletions(-)
> > 
> > diff --git a/Documentation/x86/boot.txt b/Documentation/x86/boot.txt
> > index 3840b6f..72702db 100644
> > --- a/Documentation/x86/boot.txt
> > +++ b/Documentation/x86/boot.txt
> > @@ -1110,7 +1110,8 @@ firmware, 'table' is the EFI system table - these are the first two
> >  arguments of the "handoff state" as described in section 2.3 of the
> >  UEFI specification. 'bp' is the boot loader-allocated boot params.
> >  
> > -The boot loader *must* fill out the following fields in bp,
> > +The boot loader *must* zero the entirity of bp, and then fill out the
> > +following fields:
> >  
> >      o hdr.code32_start
> >      o hdr.cmd_line_ptr
> > @@ -1118,4 +1119,4 @@ The boot loader *must* fill out the following fields in bp,
> >      o hdr.ramdisk_image (if applicable)
> >      o hdr.ramdisk_size  (if applicable)
> >  
> 
> Wait a bloody minute here... I seem to have managed to miss something big.
> 
> Matt, should we not be copying the setup part of the structure just as
> we do for the normal 32/64-bit protocol?  If not, why not?

The structure that contains the hdr.version? Yeah, we should be copying
that.


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