G - Physics – 06 – F
Patent
G - Physics
06
F
354/243
G06F 9/06 (2006.01) G06F 12/14 (2006.01) G06F 13/00 (2006.01)
Patent
CA 1055615
ABSTRACT OF THE DISCLOSURE: The present invention concerns an apparatus for protect- ing information stored in a virtual memory from unauthorized users by restricting accessability to the information in accordance to levels of privilege. The protecting apparatus comprises, in com- bination with an access checking mechanism, first arrangements for storing in the virtual memory at least one segment table comprising a plurality of segment descriptors, each having a predetermined format containing an access information element and a base address element in predetermined positions of the format. A plurality of second arrangements, having a predetermined format, communicating with the first arrangements, for storing in a predetermined portion of the second arrangements, provide a segment number for identifying a segment table and the location of a segment descriptor within the segment table. The second arrangements also store an offset address within a segment identified by the segment descriptor. Third arrangements are responsive to an address syllable element of an instruction being executed for addressing one of the plura- lity of second arrangements. Fourth arrangements store a displa- cement from the address syllable. Fifth arrangements communicate with said first, second, third and fourth arrangements for ad- ding the displacement and the base address to the offset. And sixth arrangements are responsive to the access information element in a selected one of the segment descriptors for restricting the accessibility to the segment associated with the selected one of the segment descriptors in accordance to the level of privilege and the type of access specified in the access information element.
214997
Appell Marc
Bradley John J.
de Rivet Philippe H.
Franklin Benjamin S.
Lepicard Georges
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