The Barbarian rage power states:
Spirit Totem, Lesser:
While raging, the barbarian is surrounded by spirit wisps that harass her foes. These spirits make one slam attack each round against a living foe that is adjacent to the barbarian. This slam attack is made using the barbarian’s full base attack bonus, plus the barbarian’s Charisma modifier. The slam deals 1d4 points of negative energy damage, plus the barbarian’s Charisma modifier.
If I were to multiclass primarily into another class, does this power -only- take the BAB from Barbarian levels, or does it just include your BAB total and is saying "Barbarian" in generality?