| 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. |
