Re: [Xen-devel] Genapic

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 18 May 2005, at 16:45, Puthiyaparambil, Aravindh wrote:

> Genapic is done differently for i386 and x86_64 in the LK. In i386 it 
> is
> machine specific and in x86_64 it is APIC model specific. Do you want
> Xen to mimic that? Further more both i386 and x86_64 have separate
> apic.c, io_apic.c (just to name a couple) files. Xen shares them 
> between
> the two. Will that cause any problems?
>
> I am wondering if it is possible to have a unified genapic for Xen. Or
> is it way too complicated?
Shared platform code (apics and the like) has been remarkably simple. 
This is to be expected:  processor differences aside, i386 and x86/64 
are identical platforms. So, for example, fixing Xen's smpboot.c 
(derived from Linux/i386) for x86/64 required one or two lines to be 
changed. Same for ACPI parsing, MP-table parsing, and so on. I wonder 
why i386 and x86/64 have been allowed to diverge so wildly in Linux? 
:-)
 -- Keir


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