* Note: GTT start, end, size should be initialized before calling this
* function on AGP platform.
*
* Note: GTT start, end, size should be initialized before calling this
* function on AGP platform.
*
* this shouldn't be a problem as we are using the PCI aperture as a reference.
* Otherwise this would be needed for rv280, all r3xx, and all r4xx, but
* not IGP.
* this shouldn't be a problem as we are using the PCI aperture as a reference.
* Otherwise this would be needed for rv280, all r3xx, and all r4xx, but
* not IGP.