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Re: [Xen-devel] [RFC] change provided physical RAM map to add EBDA

To: Guillaume Thouvenin <guillaume.thouvenin@xxxxxxxxxxxx>, Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>
From: Keir Fraser <keir@xxxxxxxxxxxxx>
Date: Thu, 15 Mar 2007 10:55:26 +0000
Cc: Xen devel ML <xen-devel@xxxxxxxxxxxxxxxxxxx>
Delivery-date: Thu, 15 Mar 2007 03:54:50 -0700
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
Thread-index: Acdm8G/3rnHp5NLjEdu/SQAX8io7RQ==
Thread-topic: [Xen-devel] [RFC] change provided physical RAM map to add EBDA

On 15/3/07 08:45, "Guillaume Thouvenin" <guillaume.thouvenin@xxxxxxxxxxxx>
wrote:

> My idea is to map the real memory region that contains EBDA to dom0. So
> dom0 will see the real machine memory region under 640Ko (0xa0000) in is
> own physical map.

You're creating difficulties where there are none: dom0 already has a
mapping of all memory below 1MB. Just use isa_bus_to_virt(0x40e).

 -- Keir

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