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[Xen-devel] EPS Signature

  • To: "Xen devel list" <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "Kaushik Barde" <Kaushik_Barde@xxxxxxxxxxx>
  • Date: Sun, 4 Feb 2007 18:29:41 -0800
  • Delivery-date: Sun, 04 Feb 2007 18:29:22 -0800
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcdG/Nc6FhN5E7LwEduJCgAX8io7RQAASYug
  • Thread-topic: EPS Signature


We want to access the EBDA Entry Point Signature at 40:0E for our DOM-0 through 
a driver,
We noticed that driver is trying to read from a pseudo physical location and 
not the physical machine RAM location. Hence it's not getting the proper value. 
But if we have to read from the machine RAM location we can use ( virt_to_bus 
or bus_to_virt) per dev_list comments. 

But this area is under the control of hypervisor. I do not know if we can 
ioremap these pages ( those which belong to hypervisor). 

I am trying to see if we can be able to get to the 40:0E address. And get the 
correct EPS signature


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