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

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Message-ID: <236ccac0708201020y2bfe4aadj8b1f6df361f61@mail.gmail.com>
Date:	Mon, 20 Aug 2007 10:20:48 -0700
From:	"San Mehat" <san@...gle.com>
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 8/20/07, H. Peter Anvin <hpa@...or.com> 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.
>
> *Sigh.*
>

Actually some implementations do run PEI in 32 bit and DXE/BDS in 64
bit; I'm not sure what Macintosh does though..

-san
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