SetupDesignGuide.pdf - Firmware Encoding Index

Setup Design Guide
DRAFT
8
Simple Input Modification
Modifications have been made in the SIMPLE_INPUT protocol to support additional keys.
8.1 Extending Simple Input
The SIMPLE_INPUT protocol has some extensions that are being added. The following is a modified
version of the Control Characters and EFI Scan Codes for the SIMPLE_INPUT protocol.
The SIMPLE_INPUT protocol defines an input stream that contains Unicode characters and required
EFI scan codes. Only the control characters defined in Table 3-1 have meaning in the Unicode input or
output streams. The input stream does not support any software flow control.
Table 3-1.
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.
The input stream supports Scan Codes in addition to Unicode characters. If the Scan Code is set to
0x00 then the Unicode character is valid and should be used. If the Scan Code is set to a non-0x00
value it represents a special key as defined by Table 3-2.
Table 3-2.
EFI Scan Codes for SIMPLE_INPUT_INTERFACE
EFI Scan Code
0x0000
0x0001
0x0002
0x0003
0x0004
0x0005
0x0006
0x0007
0x0008
0x0009
0x000a
Description
Null scan code.
Move cursor up 1 row.
Move cursor down 1 row.
Move cursor right 1 column.
Move cursor left 1 column.
Home.
End.
Insert.
Delete.
Page Up.
Page Down.
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