linux-kernel - Re: [PATCH 1/3 -v4] x86_64 EFI runtime service support: EFI basic runtime service support

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Date:	Mon, 29 Oct 2007 09:05:38 +0800
From:	"Huang, Ying" <ying.huang@...el.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	Andi Kleen <ak@...e.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Chandramouli Narayanan <mouli@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [PATCH 1/3 -v4] x86_64 EFI runtime service support: EFI basic
	runtime service support

On Fri, 2007-10-26 at 12:31 +0100, Alan Cox wrote:
> On Fri, 26 Oct 2007 09:03:11 +0800
> "Huang, Ying" <ying.huang@...el.com> wrote:
> 
> > On Thu, 2007-10-25 at 18:09 +0200, Thomas Gleixner wrote:
> > > > EFI runtime
> > > > services initialization are implemented in efi.c. Some x86_64
> > > > specifics are worth noting here. On x86_64, parameters passed to UEFI
> > > > firmware services need to follow the UEFI calling convention. For this
> > > > purpose, a set of functions named lin2win<x> (<x> is the number of
> > > > parameters) are implemented. EFI function calls are wrapped before
> > > > calling the firmware service.
> > > 
> > > Why needs this to be called lin2win? We do not call Windows, we call
> > > EFI services, so please use a naming convention which is related to
> > > the functionality of the code.
> > > 
> > > > + *
> > > > + *  Function calling ABI conversion from SYSV to Windows for x86_64
> > > 
> > > Again, these are wrappers to access EFI and not Windows.
> > 
> > EFI uses the Windows x86_64 calling convention. The lin2win may be a
> > more general naming convention that can be used for some other code (the
> > NDISwrapper?) in the future. Do you agree?
> 
> The SYSV description is wrong as well. SYSV has no calling convention. I
> think you mean iABI or iBCS2 ?

The SYSV description comes from the following document:
http://www.x86-64.org/documentation/abi-0.98.pdf


> Whats wrong with following the pattern of other calls like syscall(...)
> and just having eficall() ?

Yes. This is better.

Best Regards,
Huang Ying
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