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Method and apparatus for redirecting input/output device data in a computer system through use of debug registers
Method and apparatus for redirecting input/output device data in a computer system through use of debug registers
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机译:通过使用调试寄存器来重定向计算机系统中的输入/输出设备数据的方法和装置
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摘要
A computer system implements a standard modem without the use of a microcontroller. Instead, a digital signal processor is provided on an expansion card, but with direct links to the computer system itself. The code usually implemented in the microcontroller is instead implemented as a virtual modem controller to be called by the operating system of the computer itself. Further, this virtual modem controller includes a virtualized UART, that appears to the operating system software as a hardware UART, and the operating system driver software need not even have its input and output instructions replaced. Instead, debug registers are provided as breakpoints whenever an input/output instruction is executed to the I/O port range at which the UART would normally appear.
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