if_ed(4) & kvtop()

[Adriaan de Groot]

[please bear with my relative n00bness; i'm trying to cut my teeth on some 
driver hackery] 

The ne2k driver ed(4) is disabled in amd64's kernel because it doesn't even 
compile. I gather that its use of kvtop() is deprecated as well (from the 
busdma project page). The pointer size problems with this driver I can deal 
with - there are some local variables declared int which need to be 
c(?)addr_t instead. But I have no idea what to do with kvtop(). Some googling 
yields hits about it being taken out, and about people being confused and the 
handbook section on the PCI bus containing an outdated section. But nothing 
about what the function does (well, I can guess virtual-to-physical address 
translation for kernelspace) or what is supposed to replace it. Barring a cvs 
log on some driver that's already made the transition to not using kvtop(), 
is there any documentation available on the issue? Or a hint, at least?