168 lines
4.1 KiB
Groff
168 lines
4.1 KiB
Groff
.TH KEYMAP 5
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.SH NAME
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keymap \- keyboard maps
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.SH SYNOPSIS
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.B /etc/keymap
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.SH DESCRIPTION
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.B /etc/keymap
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is the compressed mapping from keyboard scan codes to ASCII.
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It is made from a keymap source file consisting of MAP_COLS columns
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(MINIX assigns the value 6 to MAX_COLS, corresponding to key pressed,
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key+SHIFT, key+LEFT_ALT, key+RIGHT_ALT, key+ALT+SHIFT and key+CTRL) and
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NR_SCAN_CODES rows (MINIX assigns the value 0x80 to NR_SCAN_CODES,
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corresponding to the number of scan codes to be provided by the keyboard),
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and each element is 2 bytes in length (see u16_t in type definitions).
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The low order byte corresponds to the character represented by the scan
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code, and the high order byte corresponds to the special meaning (when
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CAPS LOCK has effect, if it is a function key, etc.), which is converted to
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binary keymap format using the
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.BR genmap
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utility.
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.PP
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.SS "Types (general): <sys/types.h>"
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<sys/types.h> defines the
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.B u8_t
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and
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.B u16_t
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types, corresponding to 8 and 16 bit values.
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.SS "Macros: <minix/keymap.h>"
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.TP
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.BI "C(" c ") - Control"
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Maps to control code
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.TP
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.BI "A(" c ") - Alt"
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Sets the eight bit
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.TP
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.BI "CA(" c ") - Control-Alt"
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Short for
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.BI "A(C(" c "))"
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.TP
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.BI "L(" c ") - Caps Lock"
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Adds Caps Lock effect
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.PP
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These macros are used in a keymap source file to help define keys. So
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instead of writing
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.B 032
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to put a CTRL-Z in the map you write
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.BR "C('Z')" .
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The
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.BI "L(" c ")"
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macro is used in column 0 to tell that the Caps Lock key is active for this
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key. (Caps Lock should only have effect on letters.)
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.SS "Definitions: <minix/keymap.h>"
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<minix/keymap.h> contains a large number of definitions for special keys,
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like function keys, and keys on the numeric keypad. They are:
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.PP
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Escape key and modifiers:
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.BR EXT ,
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.BR CTRL ,
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.BR SHIFT ,
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.BR ALT .
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.PP
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Numeric keypad keys:
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.BR HOME ,
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.BR END ,
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.BR UP ,
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.BR DOWN ,
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.BR LEFT ,
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.BR RIGHT ,
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.BR PGUP ,
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.BR PGDN ,
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.BR MID " (numeric '5'),"
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.BR PLUS ,
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.BR INSRT .
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.PP
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ALT + numpad key:
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.BR AHOME ,
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.BR AEND ", ...,"
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.BR AINSRT .
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.PP
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CTRL + numpad:
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.BR CHOME ,
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.BR CEND ", ...,"
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.BR CINSRT .
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.PP
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Lock keys:
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.BR CALOCK " (Caps Lock),"
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.BR NLOCK " (Num Lock),"
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.BR SLOCK " (Scroll Lock)."
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.PP
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Function keys:
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.BR F1 ", ...,"
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.BR F12 .
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.PP
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ALT - function key:
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.BR AF1 ", ...,"
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.BR AF12 .
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.PP
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CTRL - function key:
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.BR CF1 ", ...,"
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.BR CF12 .
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.PP
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SHIFT - function key:
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.BR SF1 ", ...,"
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.BR SF12 .
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.PP
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ALT - SHIFT - function key:
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.BR ASF1 ", ...,"
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.BR ASF12 .
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.PP
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There is one key definition that isn't a key at all:
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.BR EXTKEY .
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This keycode is sent by the keyboard as an indicator that the next keycode
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is special. For instance both ALT keys have the same keycode, but the right
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ALT key is sent by the keyboard preceded by the EXTKEY keycode. The same is
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true for the '/' key on the numeric pad versus the other '/' key on the US
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keyboard. (On other keyboards this key may have a different symbol.) The
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keyboard driver knows that a different key is presses if it is preceded by
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EXTKEY.
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.SS "Creating/changing keyboard mapping"
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You can create your own keyboard mapping by copying one of the existing
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keymap source files (Standard Minix:
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.BR kernel/keymaps/*.src ,
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Minix-vmd:
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.BR kernel/ibm/keymaps/*.src )
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and modifying the desired keys. Once this has been done, you need to
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recompile the genmap.c file, either by adding a new entry to the Makefile,
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or by running the following commands:
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.PP
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.RS
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.ft B
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cc -DKEYSRC=\e"\fIkeymap\fP.src\e" genmap.c
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.ft P
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.RE
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.PP
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After this, the
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.BR keymap
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file can be generated by running:
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.PP
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.RS
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.BI "a.out > " keymap .map
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.RE
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.PP
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The keymap can be loaded in the keyboard driver by:
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.PP
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.RS
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.BI "loadkeys " keymap .map
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.RE
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.PP
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It is wise to first run
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.B loadkeys
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on one of the maps in
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.B /usr/lib/keymaps
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so that you can easily revert back to a known keymap with a few taps on the
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up-arrow key and pressing return. You will otherwise have to fix the keymap
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with a faulty keymap loaded into the keyboard driver, which is no fun.
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.PP
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When the keymap is to your satisfaction you can copy it to
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.B /etc/keymap
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to have it loaded automatically at reboot.
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.SH FILES
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.TP 15
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.B /etc/keymap
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Default keymap file
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.SH "SEE ALSO"
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.B loadkeys (1).
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.SH AUTHOR
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Victor A. Rodriguez - El bit Fantasma (Bit-Man@Tasa.Com.AR)
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