linux-kernel - Re: [tip:x86/urgent] x86, efi: Delete efi_ioremap() and fix CONFIG_X86

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Date:	Wed, 7 Mar 2012 18:18:00 +0000
From:	Matthew Garrett <mjg@...hat.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Matt Fleming <matt.fleming@...el.com>,
	"H. Peter Anvin" <hpa@...nel.org>, mingo@...hat.com,
	linux-kernel@...r.kernel.org, keithp@...thp.com,
	rui.zhang@...el.com, huang.ying.caritas@...il.com,
	stable@...r.kernel.org, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/urgent] x86, efi: Delete efi_ioremap() and fix
 CONFIG_X86_32 oops

On Wed, Mar 07, 2012 at 10:14:15AM -0800, Yinghai Lu wrote:

> but my question is:
> is there any system that will put EFI runtime, or ACPI or NVS above
> 4G? is that legal?

You can't run a 32-bit EFI OS on a 64-bit EFI system, so there's no 
obvious reason why there couldn't be runtime regions above 4GB.

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