From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ian Campbell Subject: Re: Grab the physical address of a label Date: Thu, 7 Jun 2012 07:31:19 +0100 Message-ID: <1339050679.6557.21.camel@dagon.hellion.org.uk> References: <1338975815.32319.40.camel@zakaz.uk.xensource.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Zeinab Alebouyeh Cc: "xen-devel@lists.xen.org" List-Id: xen-devel@lists.xenproject.org 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.