linux-kernel - Re: [PATCH 5/5] x86_64 EFI support -v3: EFI document

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Message-Id: <1186478984.3769.46.camel@caritas-dev.intel.com>
Date:	Tue, 07 Aug 2007 17:29:44 +0800
From:	"Huang, Ying" <ying.huang@...el.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	ak@...e.de, akpm@...ux-foundation.org,
	Yinghai Lu <yhlu.kernel@...il.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Chandramouli Narayanan <mouli@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] x86_64 EFI support -v3: EFI document

On Thu, 2007-08-02 at 01:16 +0800, Eric W. Biederman wrote:
> > The parameters are rearranged, because the pointer is too small. For
> > example, the EFI system table pointer is 8 bytes in x86_64, while it
> is
> > 4 bytes in i386.
> 
> Ok.  I see what is happening.  When the documentation is for arch/i386
> unsigned long is 4 bytes, and you are using unsigned long to mean 8
> bytes.  For an 8 byte fields please just spell out the size as 8
> bytes.

Ok. Will do in the next version.
> 
> How does EFI handle 32bit/64bit compatibility?  In particular
> how do I load a 32bit kernel on machine with a 64bit EFI?  Can
> it be done?
> 
Because the EFI memory map is converted to E820 map in bootloader now,
it is possible to load 32bit kernel on machine with a 64bit EFI. But it
is almost impossible to call EFI runtime service in 32bit kernel. But I
think EFI runtime service is not essential in this situation, because
the raw hardware can be used too.

Best Regards,
Huang Ying
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