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

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Message-ID: <46CA61DD.4010102@zytor.com>
Date:	Mon, 20 Aug 2007 20:54:05 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Huang, Ying" <ying.huang@...el.com>
CC:	Andi Kleen <ak@...e.de>, Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Chandramouli Narayanan <mouli@...ux.intel.com>,
	linux-kernel@...r.kernel.org, Aaron Durbin <adurbin@...gle.com>
Subject: Re: [PATCH 0/3] x86_64 EFI runtime service support

Huang, Ying wrote:
> 
> I think the "next" field can be u32 instead of u64. Because the linked
> list of struct setup_data is prepared by bootloader, which can control
> the memory location.
> 

That's making some pretty serious assumptions on future boot loaders and
environments.

> Previously, I think the "zero page" is not external formally, so we can
> ignore the user. But it is used by some bootloaders. So your proposal
> may be better, especially for these bootloaders.
> 
> I think something others need to be done:
> 
> - Increase the version number of standard boot protocol.
> - Add the contents of zero page into standard boot protocol document as
> a optional part for 32-bit entry (and 64-bit entry?).

Probably, yes.

> As for the magic number in zero page, do you think it should be used
> only by 16-bit kernel setup code?

Absolutely not.

	-hpa
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