#define OPAL_CHECK_TOKEN                     80

int64_t opal_check_token(uint64_t 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 {

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.