RTEMS Ada User's Guide
The rtems.port_external_to_internal directive is used to
convert an address from external to internal representation for
the specified port.
The rtems.port_internal_to_external directive is
used to convert an address from internal to external
representation for the specified port. If an attempt is made to
convert an address which lies outside the specified DPMA, then
the address to be converted will be returned.
RTEMS Ada User's Guide
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