RE: [Xen-devel] EPS Signature

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> 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

Dom0 already has the bottom 1MB of physical ram mapped. You can use the
poorly named isa_bus_to_virt()

Ian



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