Hash index table hash generator apparatus
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United States of America Patent
Stats
-
Jul 29, 1980
Grant Date -
N/A
app pub date -
Oct 23, 1978
filing date -
Oct 23, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention discloses an apparatus for the efficient translation of virtual addresses to main storage addresses by means of a hash index table which contains main storage addresses. Hash generator apparatus is provided for generating a uniform distribution of hash index table entry addresses from a non-uniform distribution of virtual addresses in a data processing system, where the size of the hash index table is variable and is based on the size of main storage. A field of bits within the virtual address corresponding to the page identification bits are reversed in order and aligned with two groups of bits from a field of bits within the virtual address corresponding to object identification bits, and the three groups of bits are applied to an EXCLUSIVE-OR circuit. The alignment of the three groups of bits and the size of the hash index table entry addresses generated by the present invention are based on the size of the hash index table.
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