isa: Add isa_address_space_io()
This function permits to retrieve ISA IO address space. It will be usefull when we need to pass IO address space as argument. Signed-off-by: NJulien Grall <julien.grall@citrix.com> Acked-by: NAvi Kivity <avi@redhat.com> Signed-off-by: NAndreas Färber <afaerber@suse.de>
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