KEYMAP(5)KEYMAP(5)NAMEkeymap - keyboard maps
SYNOPSIS
/etc/keymap
DESCRIPTION
/etc/keymap is the compressed mapping from keyboard scan codes to
ASCII. It is made from a keymap source file consisting of MAP_COLS
columns (MINIX assigns the value 6 to MAX_COLS, corresponding to key
pressed, key+SHIFT, key+LEFT_ALT, key+RIGHT_ALT, key+ALT+SHIFT and
key+CTRL) and NR_SCAN_CODES rows (MINIX assigns the value 0x80 to
NR_SCAN_CODES, corresponding to the number of scan codes to be provided
by the keyboard), and each element is 2 bytes in length (see u16_t in
type definitions). The low order byte corresponds to the character
represented by the scan code, and the high order byte corresponds to
the special meaning (when CAPS LOCK has effect, if it is a function
key, etc.), which is converted to binary keymap format using the genmap
utility.
Types (general): <sys/types.h>
<sys/types.h> defines the u8_t and u16_t types, corresponding to 8 and
16 bit values.
Macros: <minix/keymap.h>
C(c) - Control
Maps to control code
A(c) - Alt
Sets the eight bit
CA(c) - Control-Alt
Short for A(C(c))
L(c) - Caps Lock
Adds Caps Lock effect
These macros are used in a keymap source file to help define keys. So
instead of writing 032 to put a CTRL-Z in the map you write C('Z').
The L(c) macro is used in column 0 to tell that the Caps Lock key is
active for this key. (Caps Lock should only have effect on letters.)
Definitions: <minix/keymap.h>
<minix/keymap.h> contains a large number of definitions for special
keys, like function keys, and keys on the numeric keypad. They are:
Escape key and modifiers: EXT, CTRL, SHIFT, ALT.
Numeric keypad keys: HOME, END, UP, DOWN, LEFT, RIGHT, PGUP, PGDN, MID
(numeric '5'), PLUS, INSRT.
ALT + numpad key: AHOME, AEND, ..., AINSRT.
CTRL + numpad: CHOME, CEND, ..., CINSRT.
Lock keys: CALOCK (Caps Lock), NLOCK (Num Lock), SLOCK (Scroll Lock).
Function keys: F1, ..., F12.
ALT - function key: AF1, ..., AF12.
CTRL - function key: CF1, ..., CF12.
SHIFT - function key: SF1, ..., SF12.
ALT - SHIFT - function key: ASF1, ..., ASF12.
There is one key definition that isn't a key at all: EXTKEY. This key‐
code is sent by the keyboard as an indicator that the next keycode is
special. For instance both ALT keys have the same keycode, but the
right ALT key is sent by the keyboard preceded by the EXTKEY keycode.
The same is true for the '/' key on the numeric pad versus the other
'/' key on the US keyboard. (On other keyboards this key may have a
different symbol.) The keyboard driver knows that a different key is
presses if it is preceded by EXTKEY.
Creating/changing keyboard mapping
You can create your own keyboard mapping by copying one of the existing
keymap source files (Standard Minix: drivers/tty/keymaps/*.src) and
modifying the desired keys. Once this has been done, you need to recom‐
pile the genmap.c file, either by adding a new entry to the Makefile,
or by running the following commands:
cc -DKEYSRC=\"keymap.src\" genmap.c
After this, the keymap file can be generated by running:
a.out > keymap.map
The keymap can be loaded in the keyboard driver by:
loadkeys keymap.map
It is wise to first run loadkeys on one of the maps in /usr/lib/keymaps
so that you can easily revert back to a known keymap with a few taps on
the up-arrow key and pressing return. You will otherwise have to fix
the keymap with a faulty keymap loaded into the keyboard driver, which
is no fun.
When the keymap is to your satisfaction you can copy it to /etc/keymap
to have it loaded automatically at reboot.
FILES
/etc/keymap Default keymap file
SEE ALSO
loadkeys (1).
AUTHOR
Victor A. Rodriguez - El bit Fantasma (Bit-Man@Tasa.Com.AR)
KEYMAP(5)