I need help fixing the agp_nvidia.c driver

[jason]

Hello everyone,
    I have a problem loading agp.  Every time I do load it at boot from 
rc.conf and do a startx the machine hard locks.  So I decided to check 
the source code and maybe make some modifications.  I have an epox 8rda 
with the nforce 2 chipset, and a radeon 8500.  I am running 5.1.

    I noticed in the driver for my chipset(agp_nvidia.c) "wbc_mask" was 
coming up, and it was only in 1 driver, mine.  I checked for it in all 
related files and have found:
 "#define    AGP_NVIDIA_1_WBC        0xf0" in agpreg.h,
 "#define PCIM_BRIO_MASK        0xf" in pcireg.h. 

    Would anyone know if BRIO_MASK = Base Register In Out_MASK, and what 
does PCIM and WBC mean?  This is the first driver I have worked on or 
with and I am seeing allot of stuff that must be standard in linux(that 
is where agp_nvidia.c comes from) because it just does not look like 
other bsd code in the other agp drivers I have compared it too.  
Although I have also heard that the drivers nvidia writes for linux are 
pretty bad, I think they were referring to the style not the quality if 
I remember correctly.
Thanks,
Jason