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include vmm.inc Dispatch_Byte_IO In_Proc, Out_Proc |
The Dispatch_Byte_IO macro checks the size of the I/O request and dispatches the request to either the Simulate_IO service, or to the specified single-byte input or output procedure. I/O callback procedures use this macro to simplify processing of I/O requests.
In_Proc
Specifies the name of the procedure to carry out a single-byte input operation. If this parameter is the Fall_Through keyword, the macro ignores input operations.
Out_Proc
Specifies the name of the procedure to carry out a single-byte output operation. If this parameter is the Fall_Through keyword, the macro ignores output operations.
This macro has no return value.
The EAX, EBX, ECX, EDX, and EBP registers must contain values specified as valid input parameters for the Simulate_IO service. Dispatch_Byte_IO checks the ECX register for the I/O type. If this type specifies an I/O request that is larger than a byte, the macro jumps to the Simulate_IO service.