Address space control apparatus for virtual memory systems

Details Address space control apparatus for virtual memory systems Address space control apparatus for virtual memory systems

1989-09-26

1993-05-11

Dixon, Joseph L.

Boots, shoes, and leggings

364DIG1, G06F 1200, G06F 1206, G06F 1208, G06F 1210

Patent

active

052108406

ABSTRACT:
In a disclosed embodiment of the address space control apparatus, each general-purpose register usable as a base register is associated with another general-purpose register in addition to an access register containing a segment table origin. When a general-purpose register is selected as a base register, the contents of its associated general-purpose register are read out and added to the segment table origin from the associated access register to provide an effective segment table origin. In a modification, the access registers are omitted, and the general-purpose register selected as a base register are used to select an entry in a register or register array containing segment table origins in respective entries. In other embodiments disclosed, general-purpose registers are used in different manners to enhance virtual address space control functions.

REFERENCES:
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patent: 4521846 (1985-06-01), Scalzi et al.
patent: 4654777 (1987-03-01), Nakamura
patent: 4979098 (1990-12-01), Baum et al.
patent: 4992936 (1991-02-01), Katada et al.
patent: 5008811 (1991-04-01), Scalzi et al.
patent: 5023777 (1991-06-01), Sawamoto
Electronics Engineers' Handbook, second edition, Donald G. Fink and Donald Christiansen, McGraw-Hill Book Company, 1982, pp. 23-23 and 23-24.

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