Stack switching mechanism in a computer system
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United States of America Patent
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Jun 29, 2004
Grant Date -
Feb 14, 2002
app pub date -
Aug 1, 2001
filing date -
Aug 9, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
A method and mechanism for performing an unconditional stack switch in a processor. A processor includes a processing unit coupled to a memory. The memory includes a plurality of stacks, a special mode task state segment, and a descriptor table. The processor detects interrupts and accesses a descriptor corresponding to the interrupt within the descriptor table. Subsequent to accessing the descriptor, the processor is configured to access an index within the descriptor in order to determine whether or not an interrupt stack table mechanism is enabled. In response to detecting the interrupt stack table mechanism is enabled, the index is used to select an entry in the interrupt stack table. The selected entry in the interrupt stack table indicates a stack pointer which is then used to perform an unconditional stack switch.
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