Intel Extensible Firmware Interface - Manual (Page 296)

Extensible Firmware Interface Specification
10-2 12/01/02 Version 1.10
10.1.2 ConsoleIn Definition
The SIMPLE_INPUT protocol defines an input stream that contains Unicode characters and
required EFI scan codes. Only the control characters defined in Table 10-1 have meaning in the
Unicode input or output streams. The control characters are defined to be characters U+0000
through U+001F. The input stream does not support any software flow control.
Table 10-1. Supported Unicode Control Characters
Mnemonic Unicode Description
Null U+0000 Null character ignored when received.
BS U+0008 Backspace. Moves cursor left one column. If the cursor is at the left
margin, no action is taken.
TAB U+0x0009 Tab.
LF U+000A Linefeed. Moves cursor to the next line.
CR U+000D Carriage Return. Moves cursor to left margin of the current line.