Doesn't mahāyāna have a classification for jhānas? Is it me or is it incredibly difficult to find resources on the 4 (or 8, with the arupas) jhānas and how to reach them in the mahāyāna/vajrayāna literature? Apart from vague references to samādhi in general, I can't find anything. 

Edit: In addition to the suttas, theravādins also have commentaries and books on jhānas, for example the one by Ajahn Brahm... I was looking for a mahāyāna equivalent, too bad :(

Edit 2: I've found my happiness: https://www.amazon.com/dp/1559393254

Thanks y'all!
You're right - jhanas are deemphasized (and for good reason as far as I'm concerned), but don't forget that most Mahayana schools use the Chinese Agamas as a part of their canonical literature.  The Agamas do contain, more or less, the original Sutta-pitaka along with the vinaya, abhidhamma, etc.  You're not finding anything in the newer Mahayana literature because the Mahayanists are just using a Chinese translation of the same texts a Theravadan might refer to.