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Subject: Re: [PATCH 1/3 -v4] x86_64 EFI runtime service support: EFI basic
	runtime service support
From: "Huang, Ying" <ying.huang@intel.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Arjan van de Ven <arjan@infradead.org>,
       Thomas Gleixner <tglx@linutronix.de>,
       Andrew Morton <akpm@linux-foundation.org>,
       "H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
       Andi Kleen <ak@suse.de>, Chandramouli Narayanan <mouli@linux.intel.com>,
       LKML <linux-kernel@vger.kernel.org>, pjones@redhat.com
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Date: Fri, 26 Oct 2007 09:28:47 +0800
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On Thu, 2007-10-25 at 11:06 -0600, Eric W. Biederman wrote:
> Arjan van de Ven <arjan@infradead.org> writes:
> 
> > On Thu, 25 Oct 2007 10:55:44 -0600
> > ebiederm@xmission.com (Eric W. Biederman) wrote:
> >
> >> I don't think there is a compelling case for us to use any efi
> >> services at this time
> >
> > I would almost agree with this if it wasn't for the 1 call that OS
> > installers need to tell EFI about bootloader stuff; I've cc'd Peter
> > Jones since he'll know better what OS installers need; if they don't
> > need it after all...
> 
> Yes.  I think that is usage of the variable service.  Although
> I don't know if that is actually needed.
> 
> Support for the variable service is not implemented in this
> patchset.

Support for the variable service has been implemented in this patchset.
The interfaces are:

efi.get_variable
efi.get_next_variable
efi.set_variable

And a sysfs interface (/sys/firmware/efi/vars) is provided in
drivers/firmware/efivars.c, which depends on this patchset to work.

Best Regards,
Huang Ying