Hardware support for memory protection

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Abstract
This paper is intended to stimulate discussion on the present state of hardware supported capability systems. Interest in such systems grew up in the mid-1960's and since that time information has been published on several different versions. In the opinion of some observers, the software complexity of these systems outweighs the advantage gained. The paper surveys the situation, and endeavors to set out the general features that a hardware supported capability system should possess. An attempt is made to identify the causes of the complexity and to make recommendations for removing them. The arguments for and against the tagging of capabilities are discussed and attention is drawn to a system of semi-tagging previously proposed by the author.

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