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OPAL_CHECK_TOKEN
================
This OPAL call allows the host OS to determine if a particular OPAL call is present
on a system. This allows for simple compatibility between OPAL versions and different
OPAL implementations/platforms.
One parameter is accepted: the OPAL token number.
``OPAL_CHECK_TOKEN`` will return: ::
enum OpalCheckTokenStatus {
OPAL_TOKEN_ABSENT = 0,
OPAL_TOKEN_PRESENT = 1
};
indicating the presence/absence of the particular OPAL_CALL.
``OPAL_CHECK_TOKEN`` is REQUIRED to be implemented by a conformant OPAL implementation.
For skiboot, only positively ancient internal-to-IBM versions were missing
OPAL_CHECK_TOKEN. In this case, OPAL_PARAMETER would be returned. There is no
reason for a host OS to support this behaviour.
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