Electrical computers and digital data processing systems: input/ – Input/output data processing – Peripheral configuration
Reexamination Certificate
2005-03-15
2009-08-25
Tsai, Henry W. H. (Department: 2184)
Electrical computers and digital data processing systems: input/
Input/output data processing
Peripheral configuration
C710S009000, C710S010000, C710S012000, C710S013000, C710S014000, C712S226000, C712S229000, C713S001000, C713S002000, C713S100000
Reexamination Certificate
active
07581037
ABSTRACT:
Provided are a method, system and program for effecting a processor operating mode change to execute device code. A processor receives a call while the processor is operating in a first mode, wherein the call is made to effect execution of device code to control a device. The processor determines whether the call is intended to change a processor operating mode from the first mode to a second mode. The state of the processor is selectively changed to a second mode in which the processor executes second mode instructions loaded in a protected section of memory inaccessible to an operating system in response to determining that the call is intended to change the processor operating mode. The second mode instructions execute the device code to control the device.
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Fish Andrew J.
Kinney Michael D.
Rothman Michael A.
Zimmer Vincent J.
Intel Corporation
Konrad Raynes & Victor LLP
Rhu Kris
Tsai Henry W. H.
Victor David W.
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