The usual model for PCI IO with libqos is to use qpci_iomap() to map a
specific BAR for a PCI device, then perform IOs within that BAR using
qpci_io_{read,write}*().
However, certain devices also have legacy PCI IO. In this case, instead of
(or as well as) being accessed via PCI BARs, the device can be accessed
via certain well-known, fixed addresses in PCI IO space.
Two existing tests use legacy PCI IO, and take different flawed approaches
to it:
* tco-test manually constructs a tco_io_base value instead of calling
qpci_iomap(), which assumes internal knowledge of the structure of
the value it shouldn't have
* ide-test uses direct in*() and out*() calls instead of using
qpci_io_*() accessors, meaning it's not portable to non-x86 machine
types.
This patch implements a new qpci_iomap_legacy() interface which gets a
handle in the same format as qpci_iomap() but refers to a region in
the legacy PIO space. For a device which has the same registers
available both in a BAR and in legacy space (quite common), this
allows the same test code to test both options with just a different
iomap() at the beginning.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
a7b85b6062