Re: [Xen-devel] EPS Signature

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

Isa_bus_to_virt() is available. Isa_virt_to_bus() isn't. Why would you need
the latter?

 -- Keir

On 11/2/07 01:33, "Kaushik Barde" <Kaushik_Barde@xxxxxxxxxxx> wrote:

> 
> 
> I get following Error..
> 
> 496: error: `isa_virt_to_bus_is_UNSUPPORTED' undeclared (first use in this
> function)
> 
> Is it truely unsupported or I am missing proper includes..
> 
> I suspect later but "UNSUPPORTED" makes me uncomfortable.
> 
> Please advise.
> 
> -Kaushik
> 
> 
> 
> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx on behalf of Ian Pratt
> Sent: Sun 2/4/2007 6:52 PM
> To: Kaushik Barde; Xen devel list
> Subject: RE: [Xen-devel] 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
> 
> 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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