A system for protecting supervisor mode data from user code having a processor which implements a register window architecture supporting as separate window stacks for supervisor and user modes with a transition window in one of the window stacks set with at least one invalid window bit in an invalid...http://www.google.com.tw/patents/US7984257?utm_source=gb-gplus-share專利 US7984257 - System for protecting supervisor mode data from user code
