Self-modifying copier for downloading executable code in a non-disruptive manner
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United States of America Patent
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app pub date -
Oct 18, 2006
filing date -
Aug 27, 2002
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Abandoned
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Abstract
A method and apparatus for achieving a non-disruptive code load in a digital electronic device utilizes a copier that modifies itself as it executes. A fixed data section might be left unmodified to preserve a trusted system state. The copier has two parts, a bootstrapper and a dynamic part. As a minimum, the bootstrapper copies the new dynamic part into the runtime area and initiates execution of the new dynamic part. Through the dynamic part, the desired new runtime area configuration for data and code modules is achieved. The bootstrapper is typically static through upgrades, but instruction cache associated with the processor can make self-modification of even the bootstrapper more convenient.
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