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[Xen-devel] Re: 32/64-bit hypercall interface

from [Andi Kleen]

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To:	"Nakajima, Jun" <jun.nakajima@xxxxxxxxx>
Subject:	[Xen-devel] Re: 32/64-bit hypercall interface
From:	Andi Kleen <ak@xxxxxxx>
Date:	Tue, 4 Oct 2005 18:45:20 +0200
Cc:	Jeremy Katz <katzj@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Ian Pratt <Ian.Pratt@xxxxxxxxxxxx>
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On Tuesday 04 October 2005 18:03, Nakajima, Jun wrote:

>
> I don't think we should use "int N" sacrificing the good feature for
> 64-bit when we can handle 32-bit hypercalls using a compatibility layer.
> I also think using the existing ABI convention is much better whenever
> possible and appropriate because we don't need to re-invent the wheel.
> After all, the only difference between system call and hyper call
> basically is the system/hypercall number.

Main 32bit linux solves this problem by mapping a vsyscall page into the
address space. The ABI is then just to jump to an appropiate entry point in 
it. The entry point uses the right instruction then.
 
-Andi

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