Method and apparatus for changing microcode to be executed...

Data processing: software development – installation – and managem – Software upgrading or updating – Plural version management

Reexamination Certificate

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Details

Other Related Categories

C717S175000, C365S049170

Type

Reexamination Certificate

Status

active

Patent number

07444630

Description

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.

REFERENCES:
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patent: 5860104 (1999-01-01), Witt et al.
patent: 5887152 (1999-03-01), Tran
patent: 5983337 (1999-11-01), Mahalingaiah et al.
patent: 6049672 (2000-04-01), Shiell et al.
patent: 6295644 (2001-09-01), Hsu et al.
patent: 6691308 (2004-02-01), Kasper
IBM Technical Disclosure Bulletin, published Oct. 1, 1993.

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