Method for virtually enlarging the stack of a portable data...

Details Method for virtually enlarging the stack of a portable data... Method for virtually enlarging the stack of a portable data...

2006-02-14

2006-02-14

Sparks, Donald (Department: 2187)

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

C711S103000, C711S115000, C711S165000, C712S202000

Reexamination Certificate

active

07000071

ABSTRACT:
A method is proposed for virtual enlargement of the stack of a portable data carrier allowing reloading of executable program code. To permit the execution of programs requiring a larger stack than that physically present, the stack is segmented into at least two stack segments and their fill state monitored. When complete occupation of a segment is recognized, the oldest stack segment is swapped out to a further storage medium. The further storage medium is a nonvolatile read-write memory that can be a slower memory compared to the stack. When sufficient memory space is available in the stack again, the swapped out segment is returned. The method includes managing a destination address of each stack segment swapped out to the non-volatile read-write memory in a register in a volatile read-write memory.

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