RE: [Xen-devel] About IO

["Liu, Huahang" <huahang.liu@xxxxxxxxx>]

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@xxxxxxxxxxxxxxxxxxx
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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