linux-kernel - Re: [PATCH 0/3] x86_64 EFI runtime service support

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Message-ID: <20070820201344.GA13059@srcf.ucam.org>
Date:	Mon, 20 Aug 2007 21:13:44 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Yinghai Lu <yhlu.kernel@...il.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Huang, Ying" <ying.huang@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@...e.de>,
	Chandramouli Narayanan <mouli@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] x86_64 EFI runtime service support

On Mon, Aug 20, 2007 at 10:05:11AM -0700, H. Peter Anvin wrote:
> Yinghai Lu wrote:
> > 
> > someone told me that EFI PEI will be 32 bit ( for mem etc
> > initialization), and after that will be 64 bit, so the Run time
> > service will be 64 bit only, and it will only support 64 bit OS with
> > EFI. and they have another mode to emulate the legacy BIOS to boot
> > 32bit OS.
> > 
> 
> That seems unlikely for e.g. the existing Macs already in the field.

In which direction? The existing Macs will boot a 32 (or 16) bit OS 
using legacy BIOS emulation. I've no idea if their EFI is 32 or 64 bit, 
though.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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