Xen devel - Apr 2007 - RE: About IO

Basically, I am interested about the following address: 
0xFFFE0000 to 0xFFFF0000

I want to know is there already any handlers for this area. 

If yes, where is the handler and what does it do? 

If no, how to add one? 

Thanks,
         Huahang

-----Original Message-----
From: Li, Xin B 
Sent: Friday, March 30, 2007 11:37 AM
To: Liu, Huahang; xen-devel@lists.xensource.com
Subject: RE: [Xen-devel] About IO
>What is the MMIO address space of Xen HVM? 
>From 4G-256M to 4G, you can take a look at the definition of
HVM_BELOW_4G_MMIO_LENGTH.
>What happen when I read from or write to these IO ports? 
Depends on the devices located there, if no device, Read returns ~0,
while writes are ignored.
-Xin

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On 3/4/07 02:57, "Liu, Huahang" <huahang.liu@intel.com> wrote:
> Basically, I am interested about the following address:
> 0xFFFE0000 to 0xFFFF0000
> 
> I want to know is there already any handlers for this area.
> 
> If yes, where is the handler and what does it do?
There''s no MMIO that close to the 4GB boundary. The last handler is at
0xfee00000, for the virtual IO-APIC.
> If no, how to add one?
See numerous examples (e.g., vlapic.c , vioapic.c) for how to add a handler
inside Xen.

 -- Keir



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