Electrical computers and digital processing systems: memory – Storage accessing and control – Hierarchical memories
Patent
1997-12-11
1999-08-10
Teska, Kevin J.
Electrical computers and digital processing systems: memory
Storage accessing and control
Hierarchical memories
395561, 395580, 395868, 395680, 711203, G06F 1208, G06F 9455
Patent
active
059371854
ABSTRACT:
A technique for providing device virtualization in an MS-DOS based operating environment, using an interrupt request (e.g., a non-maskable interrupt), is described. The technique includes executing an application on a processor within the MS-DOS based operating environment and, when the application attempts to address the device to be emulated, causing a processor interrupt to occur. In response to the interrupt, the processor executes code representing the virtualization of a device. The code for servicing the interrupt and emulating the device are written in protected-mode code, stored in the extended memory area, and made available by making appropriate entries into the interrupt descriptor tables (IDTs) for the protected-mode contexts which exist for the native protected-mode operating systems and for the DOS extender. The entries made into the IDT for the protected-mode context established for the DOS extender are accomplished by intercepting communications between the DOS extender and the virtual control program interface (VCPI) and patching the DOS extender's IDT with the vectors to the stored emulation code.
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Friel Joseph T.
Weir Andrew P.
Creative Technology Inc.
Phan Thai
Teska Kevin J.
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