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Some computer systems do not p

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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.
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Smizy头像 Smizy
An operating system for a machine of this type would need to remain incontrol(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 all object code is compiler-produced.The compiler would generate(eitherin-line or by function calls)the protection checks that the hardware is missing.
发表于 2018-05-05 21:20:01 回复(0)
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