Computer having an indexed local ram to store previously transla

Details Computer having an indexed local ram to store previously transla Computer having an indexed local ram to store previously transla

1980-12-29

1983-10-18

Zache, Raulfe B.

Boots, shoes, and leggings

G06F 936

Patent

active

044109415

ABSTRACT:
A multitasking data processing machine supports virtual memory comprising a plurality of segments, and has physical memory comprising relatively fast main memory and relatively slow secondary memory. A constantly varying subset of secondary memory paged contents is copied in main memory page frames. When a memory access is required during operation of the machine, a virtual address is generated, which must be translated into a physical address, in order to address main memory. The data processing machine provides an indexed local random access memory (T/RAM) for storing previously translated addresses. The T/RAM has a capacity of one entry for each page of supported virtual memory. Before a translation is performed, the T/RAM is indexed by the virtual address; in case of a T/RAM fault, translation is performed and the translated physical address is loaded to the indexed location before restarting the memory operation. A subsequent reference to the same virtual address indexes the previously translated physical address, which is then used for addressing main memory and is also applied to index a reference/change table. A stored monitor
o monitor signal associated with each segment of virtual memory controls the storage of referenced virtual addresses for monitored segments. Upon a task switch, the stored virtual addresses are applied to index the corresponding T/RAM entries for rapid selective and partial clearing of the T/RAM.

REFERENCES:
patent: 3829840 (1974-08-01), Burk et al.
patent: 4145738 (1979-03-01), Inoue et al.

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