System with real-time checking of privilege levels and the syste

Details System with real-time checking of privilege levels and the syste System with real-time checking of privilege levels and the syste

1989-08-09

1991-08-27

Lee, Thomas C.

Boots, shoes, and leggings

3642426, 3642428, 3642429, 36424291, 36424293, 3642461, 3642466, 3642469, 3642478, 3642592, G06F 946

Patent

active

050438786

ABSTRACT:
A data processing apparatus has a plurality of execution status and is adapted to control in accordance with the respective execution conditions the allowance of the execution of an instruction requiring the reference to the internal resource. The processing apparatus also comprises a register for holding the execution status, and another register for holding information controlling the reference to the internal resource. A comparator responds to the contents of the first and second registers to output a signal indicating whether the reference is allowed or not. The output signal and a strobe signal are fed to a gate, which then controls an actual reference to the internal resource.

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Motorola Microprocessors Handbook, Series C, Austin, Texas, Motorola Inc, 1983, pp. (3-302 to (3-304) and (3-342) to (3-349).

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