Intel Extensible Firmware Interface - Manual (Page 357)

Protocols — Console Support
Version 1.10 12/01/02 10-63
SERIAL_IO.GetControl()
Summary
Retrieves the status of the control bits on a serial device.
Prototype
EFI_STATUS
(EFIAPI *EFI_SERIAL_GET_CONTROL) (
IN SERIAL_IO_INTERFACE *This,
OUT UINT32 *Control
);
Parameters
This A pointer to the SERIAL_IO_INTERFACE instance. Type
SERIAL_IO_INTERFACE is defined in Section 10.12.
Control A pointer to return the current control signals from the
serial device. See “Related Definitions” below.
Related Definitions
//*******************************************************
// CONTROL BITS
//*******************************************************
#define EFI_SERIAL_CLEAR_TO_SEND 0x0010
#define EFI_SERIAL_DATA_SET_READY 0x0020
#define EFI_SERIAL_RING_INDICATE 0x0040
#define EFI_SERIAL_CARRIER_DETECT 0x0080
#define EFI_SERIAL_REQUEST_TO_SEND 0x0002
#define EFI_SERIAL_DATA_TERMINAL_READY 0x0001
#define EFI_SERIAL_INPUT_BUFFER_EMPTY 0x0100
#define EFI_SERIAL_OUTPUT_BUFFER_EMPTY 0x0200
#define EFI_SERIAL_HARDWARE_LOOPBACK_ENABLE 0x1000
#define EFI_SERIAL_SOFTWARE_LOOPBACK_ENABLE 0x2000
#define EFI_SERIAL_HARDWARE_FLOW_CONTROL_ENABLE 0x4000
Description
The GetControl() function retrieves the status of the control bits on a serial device.
Status Codes Returned
EFI_SUCCESS The control bits were read from the serial device.
EFI_DEVICE_ERROR The serial device is not functioning correctly.