Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Reexamination Certificate
2011-06-21
2011-06-21
Bragdon, Reginald G (Department: 2189)
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
C711S173000, C713S001000, C713S002000, C713S100000
Reexamination Certificate
active
07966466
ABSTRACT:
Access to memory address space is controlled by memory access control circuitry using access control data. The ability to change the access control data is controlled by domain control circuitry. Whether or not an instruction stored within a particular domain, being a set of memory addresses, is able to modify the access control data is dependent upon the domain concerned. Thus, the ability to change access control data can be restricted to instructions stored within particular defined locations within the memory address space thereby enhancing security. This capability allows systems to be provided in which call forwarding to an operating system can be enforced via call forwarding code and where trusted regions of the memory address space can be established into which a secure operating system may write data with increased confidence that that data will only be accessible by trusted software executing under control of a non-secure operating system.
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Biles Stuart David
Grisenthwaite Richard Roy
Kershaw Daniel
ARM Limited
Bansal Gurtej
Bragdon Reginald G
Nixon & Vanderhye P.C.
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