Method of and apparatus for selecting an origin address for use in translating a logical address in one of a plurality of virtual address spaces to a real address in a real address space
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United States of America Patent
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Oct 11, 1994
Grant Date -
N/A
app pub date -
Sep 24, 1990
filing date -
Sep 22, 1989
priority date (Note) -
Expired
status (Latency Note)
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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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