Method for virtually enlarging the stack of a portable data carrier
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United States of America Patent
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-
Feb 14, 2006
Grant Date -
Jan 22, 2004
app pub date -
Aug 21, 2001
filing date -
Aug 22, 2000
priority date (Note) -
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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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