A digital system is provided with a secure mode (3rd level of privilege) built in a non-invasive way on a processor system that includes a processor core, instruction and data caches, a write buffer and a memory management unit. A secure execution mode is thus provided on a platform where the only trusted...http://www.google.com.au/patents/US20030140205?utm_source=gb-gplus-sharePatent US20030140205 - Secure mode for processors supporting interrupts
