Software and hardware managed dual rule bank cache for use in a pattern matching accelerator
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United States of America Patent
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Feb 24, 2015
Grant Date -
Aug 9, 2012
app pub date -
Feb 8, 2011
filing date -
Feb 8, 2011
priority date (Note) -
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Abstract
A pattern matching accelerator (PMA) for assisting software threads to find the presence and location of strings in an input data stream that match a given pattern. The patterns are defined using regular expressions that are compiled into a data structure comprised of rules subsequently processed by the PMA. The patterns to be searched in the input stream are defined by the user as a set of regular expressions. The patterns to be searched are grouped in pattern context sets. The sets of regular expressions which define the pattern context sets are compiled to generate a rules structure used by the PMA hardware. The rules are compiled before search run time and stored in main memory, in rule cache memory within the PMA or a combination thereof. For each input character, the PMA executes the search and returns the search results.
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