Key register controlled accessing system

Details Key register controlled accessing system Key register controlled accessing system

1976-04-30

1977-07-19

Thomas, James D.

Boots, shoes, and leggings

G06F 1300

Patent

active

040372146

ABSTRACT:
A plurality of key register sections in a processor respectively associated with different machine-sensed types of accesses to a main storage of a computer system. A processor address key register (AKR) includes the following sections: (1) a section associated with an instruction-fetch type access, (2) a section associated with a source-operand fetch type access, and (3) a section associated with a sink-operand store/fetch type access. Other key register sections may be associated with respective sub-channel store/fetch type accesses. Circuits are provided which sense the different access types to select and outgate a key contained in the corresponding key register section.
The values of the keys are associated with different addressabilities (i.e. address spaces). Each different key value is associated with a different stack of translation registers for containing the block addresses in real storage currently assigned to the respective addressabilities.
Each key outgated from a respective register section selects an address space by selecting the associated stack of addressing registers to relocatably translate a logical address to a physical storage location within the address space selected by the outgated key.

REFERENCES:
patent: 3377624 (1968-04-01), Nelson
patent: 3576544 (1971-04-01), Cordero, Jr.
patent: 3771146 (1973-11-01), Cotton
patent: 3787813 (1974-01-01), Cole
patent: 3825903 (1974-07-01), Brown
patent: 3916385 (1975-10-01), Parmer

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