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Message-ID: <86802c440804101415o55af93c8o8f4dc54dfad8662e@mail.gmail.com>
Date: Thu, 10 Apr 2008 14:15:31 -0700
From: "Yinghai Lu" <yhlu.kernel@gmail.com>
To: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH 1/2] boot: increase stack size for kernel boot loader decompressor -- payload_length
Cc: "Ingo Molnar" <mingo@elte.hu>,
       "Alexander van Heukelum" <heukelum@mailshack.com>,
       "Mike Travis" <travis@sgi.com>, "Thomas Gleixner" <tglx@linutronix.de>,
       "Andrew Morton" <akpm@linux-foundation.org>,
       linux-kernel@vger.kernel.org, heukelum@fastmail.fm
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On Thu, Apr 10, 2008 at 1:37 PM, H. Peter Anvin <hpa@zytor.com> wrote:
> Yinghai Lu wrote:
>
> >
> > >
> > >  FWIIW, i've been booting allyesconfig bzImages for a long time (with
> > >  only minimal amount of drivers disabled - mostly old ISA ones that
> > >  assume the presence of the real hardware), and they boot and work fine
> > >  on both 32-bit and 64-bit typical whitebox PCs. That means huge
> bzImages
> > >  that decompresses into a ~41 MB kernel image. I'd expect that to be a
> > >  rather severe test of the decompressor.
> > >
> >
> > payload_offset and payload_length in arch/x86/boot/head.S
> > seems to be used by bootloader  to seat the bzImage.  or just use size
> > of bzImage
> >
> >
>
>  payload_offset/payload_length are used by loaders for nonstandard platform
> loaders which don't actually load a bzImage.
>
>
>
> > long term, should add one field after payload_length like
> > payload_unzip_length to make bootloader or kexec what buffer size
> > needed.
> >
>
>  You can look at the payload headers for that.
>

arch/x86/boot/compressed/head_64.S?

YH