Intel Extensible Firmware Interface, Specification

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Extensible Firmware Interface Specification
214 12/12/00 Version 1.02
SetControl
Set the control bits on a serial device. These include Request to
Send and Data Terminal Ready.
GetControl
Read the status of the control bits on a serial device. These include
Clear to Send, Data Set Ready, Ring Indicator, and Carrier Detect.
Write
Send a buffer of characters to a serial device.
Read
Receive a buffer of characters from a serial device.
Mode
Pointer to
SERIAL_IO_MODE
data. Type
SERIAL_IO_MODE
is
defined in “Related Definitions”.
Related Definitions
//*******************************************************
// SERIAL_IO_MODE
//*******************************************************
typedef struct {
UINT32 ControlMask ;
// current Attributes
UINT32 Timeout ;
UINT64 BaudRate ;
UINT32
ReceiveFifoDepth
;
UINT32 DataBits ;
UINT32 Parity ;
UINT32 StopBits ;
} SERIAL_IO_MODE;
The data values in the
SERIAL_IO_MODE
are read-only and are updated by the code that
produces the
SERIAL_IO_INTERFACE
protocol functions:
ControlMask
A mask of the Control bits that the device supports. The device must
always support the Input Buffer Empty control bit.
Timeout
If applicable, the number of microseconds to wait before timing out a
Read or Write operation.
BaudRate
If applicable, the current baud rate setting of the device; otherwise,
baud rate has the value of zero to indicate that device runs at the
device’s designed speed.
ReceiveFifoDepth
The number of characters the device will buffer on input.
DataBits
The number of data bits in each character.