Apparatus and method to change processor privilege without pipeline flush
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United States of America Patent
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May 21, 2002
Grant Date -
Apr 11, 2002
app pub date -
Oct 30, 1998
filing date -
Oct 30, 1998
priority date (Note) -
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Abstract
An apparatus and method for changing privilege level in a processor configured to pipeline instructions are presented. The processor includes a first memory storing an architectural privilege level that is set at a first privilege level, a second memory storing a plurality of instructions, and a pipeline including a plurality of processing stages. A first instruction is fetched from the memory and a determination is made whether the first instruction requires the first privilege level be changed to a second privilege level, and in response thereto, any subsequent instructions are flushed from the pipeline before recording the second privilege level in the first memory.
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