linux-kernel - Re: [PATCH v3] x86, efi: Calling __pa() with an ioremap'd address is invalid

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Message-ID: <4EB84BAD.6030707@zytor.com>
Date:	Mon, 07 Nov 2011 13:20:45 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
CC:	Matt Fleming <matt@...sole-pimps.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Zhang Rui <rui.zhang@...el.com>,
	Huang Ying <huang.ying.caritas@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] x86, efi: Calling __pa() with an ioremap'd address
 is invalid

On 11/07/2011 01:07 PM, Matthew Garrett wrote:
>>
>> I know we need to be able to pass the initramfs in memory; anything else
>> we need other than the normal EFI executable entry conditions?
> 
> If we're called before ExitBootServices(), no. If we're called after, 
> we'll need the map from GetMemoryMap(). There's some other things that 
> we may want to pass, such as option ROMs that we can get from firmware 
> but which may not otherwise be mapped - I guess those could arguably be 
> passed in the initramfs.
> 

No, we should be called before ExitBootServices(), obviously.

That was a significant part of the point.

Getting a list of the stuff we need would be useful, so we can come up
with a workable ABI for passing it.

	-hpa
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