xen: add the direct mapping area for ISA bus access
add the direct mapping area for ISA bus access when running as initial domain Signed-off-by: NJuan Quintela <quintela@redhat.com> Signed-off-by: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: NStefano Stabellini <stefano.stabellini@eu.citrix.com> Reviewed-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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