0 votes 0 votes Some computer systems do not provide a privileged mode of operation in hardware. Is it possible to construct a secure operating system for these computer systems ? Give arguments both that it is and that it is not possible. Operating System galvin operating-system descriptive + – akash.dinkar12 asked Mar 19, 2019 akash.dinkar12 1.0k views answer comment Share Follow See all 0 reply Please log in or register to add a comment.
0 votes 0 votes An operating system for a machine of this type would need to remain in control (or monitor mode) at all times. This could be accomplished by two methods: a. Software interpretation of all user programs (like some BASIC, Java, and LISP systems, for example). The software interpreter would provide, in software, what the hardware does not provide. b. Require meant that all programs be written in high‐level languages so that ll object code is compiler‐produced. The compiler would generate (either in‐ ine or by function calls) the protection checks that the hardware is missing. The code would be ridiculously complex. Give two reasons why caches are useful. What problems do they solve? What problems do they cause? If a cache can be made as large as the device for which it is caching (for instance, a cache as large as a disk), why not make it that large and eliminate the device? kamii answered Jul 15, 2021 kamii comment Share Follow See all 0 reply Please log in or register to add a comment.
