Importance

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Abstract

A microprocessor computer system for secure/high assurance/safety critical computing includes a hardware subsystem having a plurality of cache controller and cache bank modules including cache bank and memory cell hardware permission bits for managing and controlling access to system resources. A computer security framework subsystem includes a hierarchy of access layers comprising top layers and lower layers. The permission bits provide hardware level computer security primitives for a computer operating system. The top layers are completely trusted and the lower layers are moderately trusted to completely untrusted. The top layers include a trusted operating system layer that executes management and control of the system resources and permission bits. The permission bits define limits for a hardware execution security mechanism for less trusted to completely untrusted software. Exceeding bounds of the security mechanism results in a hardware exception thereby blocking all attempts to access or modify resources outside the security mechanism.

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First Claim