OpenBSD Requests UltraSPARC III Documentation
An anonymous submitter writes "OpenBSD wants to run on all hardware. They've asked Sun for documentation on the UltraSPARC III processors over and over, but been stonewalled. Theo recently asked users to talk to Sun about this issue. A fairly complete thread archive can be found here. The real kicker is that Sun has released this documentation through an NDA to Linux developers..."
R=read, W=write and X=execute. So, "per-page X bit protection" means the OS can specify for each memory page whether the bytes on that page can be executed as machine code. IA-32 has execute permissions for entire segments only, not for individual pages.