Method for updating Java Card system component based on memory management unit (MMU) framework
A technology of system components and update methods, applied in the direction of program loading/starting, program control devices, etc., can solve the problems of difficult to guarantee the security of smart cards, waste of storage space, time-consuming and other problems, so as to simplify the modification amount in the card and improve the update rate. Efficiency and security effect
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[0033] The present invention will be further described below based on the drawings and specific embodiments.
[0034] A card storage architecture based on an MMU mechanism, and a solution for upgrading Java Card system components using MMU. This solution requires a series of operations outside the card and inside the card. The outside of the card locates the modified position in the system binary target file by comparing the modification of the code, forming an update task list, and adopting a certain algorithm to optimize the list to reduce Update the number of items and the amount of communication; the modified code fragments are stored in the EEPROM in the card, and the method of modifying the TLB (Translation Lookaside Buffer) table is used to change the virtual address to physical address mapping, and the original virtual address is mapped to the modified After the storage location of the project, the code can be relocated to achieve the purpose of updating system compon...
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