Re: [Xen-devel] Grab the physical address of a label

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

Please don't top post, it makes it hard to follow the flow of the
conversation.

You might also find it useful to read
http://wiki.xen.org/wiki/Asking_Xen_Devel_Questions

On Thu, 2012-06-07 at 05:29 +0100, Zeinab Alebouyeh wrote:
> Thanks but I think if I find the base physical address of xen image I
> can convert virtual address to physical address

I'm not sure what this has to do with taking the address of a label,
like you originally asked, but...

There are macros to convert a xenheap virtual address into a physical
one and back, see __pa and __va. (Note that these only work for xenheap
addresses).

> I'm working in xen4 and my platform is: Processor AMD 64 and Centos 6
> i386 with 8G of RAM

Are you using a 32-bit or 64-bit hypervisor? 

I strongly recommend basing all future x86 work on 64-bit Xen, even if
you are using a 32 bit dom0.

> Can anyone tell me The physical address that xen image load in it?
> This physical address depends on platform?

Yes, Xen will relocate itself at start of day. You should be able to
figure out the details from the implementation of __pa and __va.

It might be helpful if you described what you are actually trying to
achieve here -- what is your end goal?

Ian.


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