VP_STATUS
VgaValidatorUcharEntry(
      ULONG Context,
      ULONG Port,
      UCHAR AccessMode,
      PUCHAR Data
  );

Routine Description:

    Entry point into the validator for byte I/O operations.

    The entry point will be called whenever a byte operation was performed
    by a DOS application on one of the specified Video ports. The kernel
    emulator will forward these requests.

Arguments:

    Context - Context value that is passed to each call made to the validator
        function. This is the value the miniport driver specified in the
        MiniportConfigInfo->EmulatorAccessEntriesContext.

    Port - Port on which the operation is to be performed.

    AccessMode - Determines if it is a read or write operation.

    Data - Pointer to a variable containing the data to be written or a
        variable into which the read data should be stored.

Return Value:

    NO_ERROR.