What hardware features are needed for efficient capability manipulation? Can these be used for memory protection?
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A hardware feature allowing a capability object to be identified as either a capability of accessible object.Typically,several bits are necessary to distinguish between different types of capability objects.
Forexample,4 bits could be used to uniquely identify 2⁴or 16 different types of capability objects.
These could not be used for routine memory protection as they offer little else for protection apart from a binary value indicating whether they are a capability object or not.Memory protection requires full support from virtual memory features discussed in Chapter 9.