Does mahayana believe in omniscience of the Buddha?

I read about the 18 characteristics of a Buddha, and the last three say he has knowledge of the past, present and future. Do mahayanists believe this means he has complete knowledge of everything in the past, present and future, or does it rather mean he has some specific knowledge of the past, present and future? As in, he knows some things that happened or that he did yesterday or some time in the past, some things that happen or which he does right now, and some things that will happen in the future.