Data processing apparatus operable in extended or unextended vir

Details Data processing apparatus operable in extended or unextended vir Data processing apparatus operable in extended or unextended vir

1991-03-04

1994-02-15

Lee, Thomas C.

Boots, shoes, and leggings

395400, 395800, 364DIG1, G06F 1208, G06F 1200

Patent

active

052874753

ABSTRACT:
An information processing system having an address expansion function without a need for increasing the number of virtual address overhead is disclosed. An extended address portion is stored in one of a plurality of registers which are selectable responsive to an instruction executed by the system when accessing an operand. A table having entries of segment table origins STOs is disposed in a main memory and is read by using the content of the selected register to obtain a segment table origin STO. An address translation of the virtual address is performed, based on the obtained STO.

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"IBM System/370 Extended Architecture Principles of Operation" Publication No. SA22-7085-1, File No. S370-01, Copyright by International Business Machines Corporation, 1983, 1987, pp. 3-21 to 3-38.

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