Electrical computers and digital processing systems: processing – Processing control – Context preserving (e.g. – context swapping – checkpointing,...
Reexamination Certificate
2011-04-19
2011-04-19
Kindred, Alford W (Department: 2181)
Electrical computers and digital processing systems: processing
Processing control
Context preserving (e.g., context swapping, checkpointing,...
C712S229000, C712S232000, C712S244000
Reexamination Certificate
active
07930524
ABSTRACT:
A method and system for executing 32-bit flat address programs during a System Management Interrupt. The system provides a 16-bit SMI routine that is given control when an SMI occurs. That routine initially saves the state of the processor and then executes an instruction to switch to protected mode. When in protected mode, the routine transfers control to 32-bit code. The 32-bit code uses a global descriptor table that is different from that used by the interrupted operating system. When the 32-bit code completes, it restores the saved processor state and returns from the interrupt by executing an RSM instruction.
REFERENCES:
patent: 5832299 (1998-11-01), Wooten
Brokaw Christopher J.
Kindred Alford W
Moll Jesse R
Phoenix Technologies Ltd.
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