Ring reduction logic mechanism

Details Ring reduction logic mechanism Ring reduction logic mechanism

G - Physics

06

F

354/230.72

G06F 9/22 (2006.01) G06F 12/14 (2006.01)

Patent

CA 2011394

ABSTRACT During the execution of an instruction by an execution unit, the instruction is stored in an instruction register, the operand including its ring number is stored in a data register and the ring number developed by the Virtual Memory Management Unit is stored in a ring effective register. The instruction addresses a control store which stores a firmware word in a control store register. A firmware field is decoded to generate a plurality of ring control signals. The ring numbers from the data and ring effective registers are compared and an effective ring number is generated. Depending on the states of the secure process signal, the ring control signals and the relative value of the ring numbers, the effective ring number is binary 00 or the larger ring number.

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