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Message-ID: <87d3b2040702010010h7534cc9cte1605e5cecd56025@mail.gmail.com>
Date: Thu, 1 Feb 2007 09:10:10 +0100
From: "Frederic Riss" <frederic.riss@gmail.com>
To: "bibo,mao" <bibo_mao@linux.intel.com>
Subject: Re: [PATCH] EFI x86: pass firmware call parameters on the stack
Cc: "Bjorn Helgaas" <bjorn.helgaas@hp.com>, linux-kernel@vger.kernel.org,
       artiom.myaskouvskey@intel.com, akpm@osdl.org,
       "Linus Torvalds" <torvalds@linux-foundation.org>
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2007/2/1, bibo,mao <bibo_mao@linux.intel.com>:
> currently x86_64 kernel does not support efi, efi convention comply to
> MS convention. On ia32 parameter is passed on stack, on x86_64 parameter
> is passed by registers but that is different from x86_64 linux convention.

Is an x86_64 EFI firmware required to have 2 entry points, one x86_64
and one in ia32 mode ? If that's not the case, it means that an i386
kernel won't be able to work correctly on an EFI powered x86_64 box...

> How about adding EFIAPI prefix before efi runtime service function, this
> prefix has different definition in different architecture.

Have you any objection to the second patch I posted? It's not only a
matter of passing arguments, ia64 does quite a lot of things in its
wrapper functions. I can easily imagine that such additional work
could be added in the i386 wrappers if EFI becomes more widely used.
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