Method of and apparatus for rapidly loading addressing environme

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

1991-12-17

1995-05-09

Bowler, Alyssa H.

Boots, shoes, and leggings

395800, 3642281, 3642282, 3642283, 3642301, 3642306, 3642321, 36423293, 364DIG1, G06F 900

Patent

active

054148219

ABSTRACT:
An apparatus for and method of loading the addressing environment of a large scale multiprogrammed instruction processor. The addressing environment is normally loaded upon initiation of an application program. Providing a separate addressing environment for each application program permits the software to be developed using virtual addressing. The addressing environment is loaded to permit the instruction processor to convert the virtual addresses to absolute addresses. The addressing environment is specified by a stack of base registers. These are loaded sequentially from a data store containing the virtual address of the initial location of each data bank to be accessed. The virtual addresses are converted to absolute addresses for loading into the base registers. During the loading process, each virtual address is evaluated to determine if it defines a valid data bank. If it does, the corresponding base register is loaded. If the virtual address is not valid, the effort to load the corresponding base register is saved and the next valid virtual address is loaded.

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