Method and apparatus for changing microcode to be executed in a processor
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United States of America Patent
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Dec 2, 2014
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N/A
app pub date -
Oct 28, 2010
filing date -
Dec 30, 1999
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Abstract
A Central Processing Unit (CPU) hotpatch circuit compares the run-time instruction stream against an internal cache. The internal cache stores embedded memory addresses with associated control flags, executable instruction codes, and tag information. In the event that a comparison against the current program counter succeeds, then execution is altered as required per the control flags. If no comparison match is made, then execution of the instruction that was accessed by the program counter is executed.
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