| 摘要 |
A technique for providing device virtualization in an MS-DOS based operating environment (212), 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 (212) 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 (114), and made available by making appropriate entries into the interrup descriptor tables (318) for the protected-mode context established for the DOS extender (410). The entries made into IDT (318) 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 (314).
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