linux-kernel - Re: [Xen-devel] EFI and multiboot2 devlopment work for Xen

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Message-ID: <20131022162632.GB19189@phenom.dumpdata.com>
Date:	Tue, 22 Oct 2013 12:26:32 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Ian Campbell <ian.campbell@...rix.com>
Cc:	grub-devel@....org, keir@....org, david.woodhouse@...el.com,
	stefano.stabellini@...citrix.com,
	Daniel Kiper <daniel.kiper@...cle.com>,
	linux-kernel@...r.kernel.org, xen-devel@...ts.xen.org,
	Jan Beulich <JBeulich@...e.com>,
	Peter Jones <pjones@...hat.com>, ross.philipson@...rix.com,
	boris.ostrovsky@...cle.com, richard.l.maliszewski@...el.com
Subject: Re: [Xen-devel] EFI and multiboot2 devlopment work for Xen

On Tue, Oct 22, 2013 at 04:22:38PM +0100, Ian Campbell wrote:
> On Tue, 2013-10-22 at 15:24 +0100, Ian Campbell wrote:
> > On Tue, 2013-10-22 at 10:09 -0400, Konrad Rzeszutek Wilk wrote:
> > 
> > > So it can be booted the same way as xen.efi. But my understanding is
> > > that folks prefer a bootloader instead of loading the bzImage in an
> > > NVRAM of a platform with pre-set parameters. Hence that mechanism
> > > is not used by the majority of users.
> > 
> > My understanding is that they prefer a bootloader which can launch Linux
> > as a PE/COFF image, i.e. the linuxefi thing.
> 
> What I'm trying to say here is that from the xen.efi or linux.efi point
> of view it can't tell if it was launched directly from the EFI shell or
> by some intermediate bootloader (i.e. by grub2's linuxefi command).

It can (at least in Linux). There are two entry points in the Linux kernel
and - one when it is launched from 'linuxefi' (See efi_stub_entry in 
arch/x86/boot/compressed/head_64.S), the other when it is launched
from an EFI shell - see efi_pe_entry in arch/x86/boot/compressed/head_64.S.
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