Method of and apparatus for selecting an origin address for use

Details Method of and apparatus for selecting an origin address for use Method of and apparatus for selecting an origin address for use

1990-09-24

1994-10-11

Dixon, Joseph L.

Boots, shoes, and leggings

364DIG1, 3642563, 3642564, 3649612, G06F 1210

Patent

active

053554612

ABSTRACT:
A data processing system capable of accessing multiple virtual address spaces wherein a an access register translation is performed when obtaining an origin address (STO) of a translation table to be used for address translation of a logical address into a real address. If an access register designated by an instruction has a value equal to a predetermined value, another STO stored in a control register is used instead of the STO obtained by the access register translation. Registers are provided for storing results of detection as to whether or not each of the access registers has a value equal to the predetermined value and a sector is provided selecting either the STO in the control register or the STO obtained by the access register translation based on the stored results of detection, thus eliminating a process to discriminate the values of the access registers at each access to the virtual address spaces.

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