A little help understanding gallium

Hello to everyone:

My question is, im reading all about the gallium project, and how it works, i think i get an idea of it, but i dont understand how it get connected with the haiku kernel, i mean, does haiku have a drm module or something like linux?..
i know (or think) winsys module should work with some libdrm.xxx or with some lib like that.. im right?...

thanks... axiz.

pd: sorry about my english...