Method of and apparatus for rapidly loading addressing registers

Details Method of and apparatus for rapidly loading addressing registers Method of and apparatus for rapidly loading addressing registers

1991-12-17

1995-01-03

Harvey, Jack B.

Boots, shoes, and leggings

3642551, 3642552, 3642555, 3642581, 3642592, 364DIG1, G06F 1206, G06F 935

Patent

active

053793927

ABSTRACT:
An apparatus for and method of loading the user addressing base register of a large scale multiprogrammed instruction processor. The base register is normally loaded to permit a user application program to access a different data segment. Providing a base register addressing environment for user application programs permits the software to be developed using virtual addressing. The addressing environment is specified by a stack of base registers. These are loaded from a data store specifying a virtual address for each data segment. During the loading process, an absolute address corresponding to the virtual address is loaded into each base register. To load a base register, a determination is made whether the future value differs from the previous value by a differential offset. If yes, the base register is loaded with an absolute address corresponding to the sum of the previous bank descriptor and the new offset. If no, the new base register value is computed by accessing a bank description table.

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