System for packing page frames with segments
US3942155A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 3, 1973 |
| Grant date | Mar 2, 1976 |
| Priority date | — |
| Expiry date | Dec 3, 1993 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F12/0292
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Provides apparatus for partitioning page frame hardware components of a main store into four partitions. The apparatus can pack small fixed size segments into each of the four partitions and can pack the first part of a large segment, or a varying-size segment into the last partition of a page frame. Hardware is disclosed for executing a create segment instruction which will pack its created segment into the same page frame with a specified existing segment. The apparatus also generates and updates a header for any page frame which is to contain a plurality of segments. The embodiment comprises comparators, registers, and their connecting gating hardware for generating the electrical signals which create the segments and page frame headers. Other hardware modifies each address in order for it to access a required partition with a selected page frame. Still other apparatus checks the upper bound of a partition containing the pertinent segment to determine that the address will not access into the next partition in the page frame, prior to the address accessing of main store. An error condition is generated if the address exceeds its segment's partition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.