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OPAL_GET_XIVE_SOURCE
====================
::
This function validates the given ``xive_num`` and sets the
``interrupt_source_number``. Then returns the proper return code.
Parameters
----------
``phb_id``
The ``phb_id`` parameter is the value from the PHB node ``ibm,opal-phbid``
property.
``xive_num``
The ``xive_num`` is the index of an XIVE that corresponds to a particular
interrupt.
``interrupt_source_number``
The ``interrupt_source_number`` is a value formed by the combination of the
device tree MSI property base BUID and ``xive_num``
Return Codes
------------
``OPAL_PARAMETER``
The indicated ``phb_id`` not found
``OPAL_UNSUPPORTED``
Presence retrieval not supported on the ``phb_id``
``OPAL_SUCCESS``
Indicates Success!
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