Ring reduction logic using parallel determination of ring number

Details Ring reduction logic using parallel determination of ring number Ring reduction logic using parallel determination of ring number

1989-03-31

1992-05-26

Lee, Thomas C.

Boots, shoes, and leggings

364DIG1, 3642318, 36424342, 364246, 364247, 3642592, 3642599, 3642628, 36492782, 364933, 3649428, 3649472, 36494834, G06F 906, G06F 1200

Patent

active

051174910

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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