Memory protection system for effecting alteration of protection

Details Memory protection system for effecting alteration of protection Memory protection system for effecting alteration of protection

1981-03-31

1984-02-28

Springborn, Harvey E.

Boots, shoes, and leggings

G06F 946

Patent

active

044344643

ABSTRACT:
In a memory protection system for a computer, memory protection information provided for each of the memory areas of a memory and memory protection information provided for each of the programs executed by a processor are collated to determine allowance/inhibition of access to the memory. By detecting that an instruction to be executed is an instruction having a particular operation and that an address of the memory to be accessed by the instruction is a particular address, the memory protection information for the program executed by the processor is alterd to allow the memory access. The alteration of memory protection information is carried out with no intervention of a control program.

REFERENCES:
patent: 3377624 (1968-04-01), Nelson et al.
patent: 3576544 (1971-04-01), Cordero et al.
patent: 3699532 (1972-10-01), Schaffer et al.
patent: 3916385 (1975-10-01), Parmar et al.
patent: 3978454 (1976-08-01), Willard
patent: 4118789 (1978-10-01), Casto

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