Electrical computers and digital processing systems: memory – Address formation – Address mapping
Reexamination Certificate
2005-07-26
2008-12-09
Sough, Hyung (Department: 2188)
Electrical computers and digital processing systems: memory
Address formation
Address mapping
C711S202000, C711S209000, C711S212000, C711S221000
Reexamination Certificate
active
07464249
ABSTRACT:
Mapping of address space by providing real storage including first and second address spaces. The second address space is smaller than and contained within the first address space. Provided within virtual storage is a system execution space. Providing within the system execution space is a system execution area having a size equal to or less than the second address space. The system execution area includes a control program having a first portion capable of addressing the first address space and the system execution space, a second portion constrained to address only the second address space and the system execution area, and at least one alias page. Responsive to a control program request for a first page in the virtual storage, a first frame is assigned in real storage corresponding to the page. Responsive to a request from the second portion of the control program for the first page, allocating an alias page in the system execution area, the alias page backed by the first frame.
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Hennessy James P.
Holder William A.
Osisek Damian L.
Beckstrand Shelley M
International Business Machines - Corporation
Patel Kaushikkumar
Samodovitz Arthur J.
Sough Hyung
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