On Fri, 2006-04-14 at 15:00 -0500, Becky Bruce wrote: > He's being sneaky - there's a copy of HID0 in the CR at this point > from the caller, and bit 9 is the position for NAP. It's a trick I learned from Darwin :) They do that regulary when code is very cpu-feature dependant, like cache code for example, they put the cpu features bitmask in CR and do branches based on individual bits of it here or there. Ben.