| Chapter 8. Console drivers |
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Chapter 8. Console drivers
Table of Contents
8.1. wscons
8.1.1. wsdisplay
8.1.2. wskbd
8.1.3. wsmouse
8.1. wscons
Wscons is NetBSD's platform-independent workstation console driver.
It handles complete abstraction of keyboards and mice. This means that
you can plug in several keyboards or mice and they will be multiplexed
onto a single terminal, but also that it can multiplex several
virtual terminals onto one physical terminal.
Wscons support is enabled by default on most architectures. This
can be done manually by adding wscons=YES to your
/etc/rc.conf. Then configure the desired number
of virtual consoles as described in Section 8.1.1.1, “Virtual consoles”
and start wscons by entering
service wscons start followed by
service ttys restart. You can now switch
virtual consoles by pressing Ctrl+Alt+Fn or
similar, depending on the platform.
Wscons comprises three subsystems: wsdisplay, wskbd and wsmouse.
These subsystems handle abstraction for all display, keyboard and mouse
devices respectively. The following sections discuss the configuration
of wscons per subsystem.
8.1.1. wsdisplay
This section will explain how to configure display and
screen-related options.
8.1.1.1. Virtual consoles
The number of pre-allocated virtual console is controlled by the
following kernel configuration option
options WSDISPLAY_DEFAULTSCREENS=4
Other consoles can be added by enabling the relevant lines in the
/etc/wscons.conf file: the comment mark (#) must
be removed from the lines beginning with screen x.
In the following example a fifth console is added to the four
pre-allocated ones:
# screens to create
# idx screen emul
#screen 0 - vt100
screen 1 - vt100
screen 2 - vt100
screen 3 - vt100
screen 4 - -
#screen 4 80x25bf vt100
#screen 5 80x50 vt100
The /etc/rc.d/wscons script transforms each of the non
commented lines in a call to the wsconscfg command:
the columns become the parameters of the call. The
idx column becomes the index
parameter, the screen column becomes the
-t type parameter (which defines the type of screen:
rows and columns, number of colors, ...) and the
emul column becomes the -e emul
parameter, which defines the emulation. For example:
screen 3 - vt100
becomes a call to:
wsconscfg -e vt100 3
Please note that it is possible to have a (harmless)
conflict between the consoles
pre-allocated by the kernel and the consoles allocated at boot time
through /etc/wscons.conf.
If during boot the system tries to allocate an already allocated
screen, the following message will be displayed:
wsconscfg: WSDISPLAYIO_ADDSCREEN: Device busy
The solution is to comment out the offending lines in
/etc/wscons.conf.
Note that while it is possible to delete a screen and add it with
different settings, it is, technically speaking, not possible to
actually modify the settings of a screen.
screen 0 cannot be deleted if used as system console.
This implies that the setting of screen 0 cannot be
changed in a running system, if used as system console.
The virtual console must also be active in
/etc/ttys, so that NetBSD runs the
getty(8) program to ask for login. For example:
console "/usr/libexec/getty Pc" pc3 off secure
ttyE0 "/usr/libexec/getty Pc" vt220 on secure
ttyE1 "/usr/libexec/getty Pc" vt220 on secure
ttyE2 "/usr/libexec/getty Pc" vt220 on secure
ttyE3 "/usr/libexec/getty Pc" vt220 off secure
...
When starting up the X server, it will look for a virtual
console with no getty(8) program running, e.g. one console
should left as "off" in /etc/ttys. The
line
ttyE3 "/usr/libexec/getty Pc" vt220 off secure
of/etc/ttys is used by the X server
for this purpose. To use a screen different from number 4, a
parameter of the form vtn must be passed to
the X server, where nis the number of the
function key used to activate the screen for X.
For example, screen 7 could be enabled in
/etc/wscons.conf and X could be started with
vt8. If you use xdm you must
edit /etc/X11/xdm/Xservers. For
example:
:0 local /usr/X11R7/bin/X +kb dpms -bpp 16 dpms vt8
8.1.1.1.1. Getting rid of the message WSDISPLAYIO_ADDSCREEN: Device busy
This error message usually occurs when wsconscfg tries
to add a screen which already exists. This occurs
if you have a screen 0 line in your
/etc/wscons.conf file, because the
kernel always allocates a screen 0 as the console device.
The error message is harmless in this case, and you can get
rid of it by deleting (or commenting out) the
screen 0 line.
8.1.1.2. 50 lines text mode with wscons
This mode is activated in the
/etc/wscons.conf. The following line must be
uncommented:
font ibm - 8 ibm /usr/share/pcvt/fonts/vt220l.808
Then the following lines must be modified:
#screen 0 80x50 vt100
screen 1 80x50 vt100
screen 2 80x50 vt100
screen 3 80x50 vt100
screen 4 80x50 vt100
screen 5 80x50 vt100
screen 6 80x50 vt100
screen 7 80x50 vt100
This configuration enables eight screens, which can be accessed with
the key combination Ctrl-Alt-Fn (where
nvaries from 1 to 8); the corresponding devices
are ttyE0..ttyE7. To enable them and get a login prompt,
/etc/ttys must be modified:
ttyE0 "/usr/libexec/getty Pc" vt220 on secure
ttyE1 "/usr/libexec/getty Pc" vt220 on secure
ttyE2 "/usr/libexec/getty Pc" vt220 on secure
ttyE3 "/usr/libexec/getty Pc" vt220 on secure
ttyE4 "/usr/libexec/getty Pc" vt220 on secure
ttyE5 "/usr/libexec/getty Pc" vt220 on secure
ttyE6 "/usr/libexec/getty Pc" vt220 on secure
ttyE7 "/usr/libexec/getty Pc" vt220 on secure
screen 0 as system console can be set to another
screen type at boot time on VGA displays. This
is a kernel configuration option. If a non-80x25 setting
is selected, it must be made sure that a usable font is
compiled into the kernel, which would be an 8x8 one
for 80x50.
There is a problem with many ATI graphics cards which don't
implement the standard VGA font switching logics: These need another
kernel option to make a nonstandard console font work.
An example set of kernel configuration options might be:
options VGA_CONSOLE_SCREENTYPE="\"80x50\""
options VGA_CONSOLE_ATI_BROKEN_FONTSEL
options FONT_VT220L8x8
8.1.1.3. Enabling framebuffer console
On many architectures, there is only one type of screen mode:
a graphical framebuffer mode. On machines with VGA graphics cards,
there is a second mode: textmode. This is an optimized mode
specially made for displaying text. Hence, this is the default
console mode for GENERIC kernels on architectures where the graphics
card is typically a VGA card (i386, amd64).
However, you can enable a framebuffer on machines with VGA
cards that support the VESA BIOS extension (VBE).
VESA framebuffer mode is configured during boot(8)
using the vesa command.
8.1.1.4. Enabling scrollback on the console
You can enable scrolling back on wscons consoles by compiling
the WSDISPLAY_SCROLLSUPPORT option into your
kernel. Make sure you don't have option
VGA_RASTERCONSOLE enabled at the same time
though! See Chapter 34, Compiling the kernel for instructions on
building a kernel.
When you have a kernel with options
WSDISPLAY_SCROLLSUPPORT running, you can
scroll up on the console by pressing LEFT SHIFT plus PAGE
UP/DOWN. Please note that this may not work on your system
console (ttyE0)!
8.1.1.5. Wscons and colors
8.1.1.5.1. Changing the color of kernel messages
It is possible to change the foreground and background
color of kernel messages by setting the following options in
kernel config files:
options WS_KERNEL_FG=WSCOL_xxx
options WS_KERNEL_BG=WSCOL_xxx
The WSCOL_xxx color constants are defined in
src/sys/dev/wscons/wsdisplayvar.h.
You can easily customize many
aspects of your display appearance: the colors used to print normal messages, the
colors used to print kernel messages and the color used to
draw a border around the screen.
All of these details can be changed either from kernel
options or through the wsconsctl(8) utility; the latter
may be preferable if you don't want to compile your own
kernel, as the default options in GENERIC
are suitable to get this tip working.
The following options can be set through
wsconsctl(8):
border: The color
of the screen border. Its respective kernel
option is WSDISPLAY_BORDER_COLOR.
msg.default.attrs: The attributes
used to print normal console messages. Its respective
kernel options are WS_DEFAULT_COLATTR
and WS_DEFAULT_MONOATTR (the former is used
in color displays, while the latter is used in monochrome
displays).
msg.default.bg:
The background color used to print normal console
messages. Its respective kernel option is
WS_DEFAULT_BG.
msg.default.fg:
The foreground color used to print normal console
messages. Its respective kernel option is
WS_DEFAULT_FG.
msg.kernel.attrs:
The attributes used to print kernel messages and warnings.
Its respective kernel options are
WS_KERNEL_COLATTR and
WS_KERNEL_MONOATTR (the
former is used in color displays, while the latter is used
in monochrome displays).
msg.kernel.bg:
The background color used to print kernel messages and
warnings. Its respective kernel option is
WS_KERNEL_BG.
msg.kernel.fg:
The foreground color used to print kernel messages and
warnings. Its respective kernel option is
WS_KERNEL_FG.
The values accepted as colors are: black, red, green,
brown, blue, magenta, cyan and white. The attributes are a
comma separated list of one or more flags, which can be:
reverse, hilit, blink and/or underline.
For example, to emulate the look of one of those old
Amstrad machines:
wsconsctl -d -w border=blue msg.default.bg=blue msg.default.fg=white msg.default.attrs=hilit
Or, to make your kernel messages appear red:
wsconsctl -d -w msg.kernel.fg=red
Note that, in older versions of NetBSD, only a subset of
this functionality is available; more specifically, you can
only change the kernel colors by changing kernel options, as
explained above.
Also note that not all drivers support these features, so
you may not get correct results on all architectures.
8.1.1.5.2. Getting applications to use colors on the console
NetBSD uses the terminfo database to
tell applications what the current terminal's capabilities are.
For example, some terminals don't support colors, some don't
support underlining (PC VGA terminals don't, for example) etc.
The TERM environment variable tells the terminfo
library the type of terminal. It then refers to its database
for the options.
The default setting for TERM can be
inspected by typing echo $TERM
on the terminal of interest. Usually this is something like
vt220. This terminal type doesn't support
colors. On a typical PC console with 25 lines, you can change
this value to wsvt25 instead, to get colors.
This is done in the C shell (csh) by entering:
setenv TERM wsvt25
In a Bourne-compatible shell (sh, ksh), you can enter:
export TERM=wsvt25
If this does not work for you, you can try the
ansi terminal type, which supports
ANSI color codes. However, other functionality may be
missing with this terminal type. You can have a look
at the file /usr/share/misc/terminfo
to see if you can find a useful match for your
console type.
8.1.1.6. Loading alternate fonts
There are several fonts in
/usr/share/wscons/fonts
that can be loaded as console fonts. This can be done with the
wsfontload(8) command, for example:
wsfontload -N ibm -h 8 -e ibm /usr/share/wscons/fonts/vt220l.808.
This command loads the IBM-encoded (-e ibm)
font in the file vt2201.808 which has a height
of eight pixels (-h 8). Name it ibm for later
reference (-N ibm).
To actually display the font on the console, use the command
wsconsctl -dw font=ibm.
If you want to edit a font, you can use the old pcvt
utils that are available in the
sysutils/pcvt-utils
package.
8.1.2. wskbd
8.1.2.1. Keyboard mappings
Wscons also allows setting the keymap to map the keys on
various national keyboards to the right characters. E.g. to
set the keymap for an Italian keymap, run:
# wsconsctl -k -w encoding=it
encoding ->it
This setting will last until the next reboot.
To make it permanent, add a encoding line to
/etc/wscons.conf: it will be executed
automatically the next time you reboot.
# cp /etc/wscons.conf /etc/wscons.conf.orig
# echo encoding it >>/etc/wscons.conf
Please be careful and type two > characters.
If you type only one >, you will overwrite
the file instead of adding a line. But that's why we always
make backup files before touching critical files!
A full list of keyboard mappings and variants can be found in
wskbd(4).
You can change the compiled in kernel default by adding
options PCKBD_LAYOUT=KB_encoding
where encoding is an uppercase entry
from the list above
(e.g.: PCKBD_LAYOUT=KB_FR). Variants can be
bitwise or'd in
(e.g.: PCKBD_LAYOUT=KB_US|KB_SWAPCTRLCAPS).
Configuring the keyboard layout under X is described
elsewhere.
8.1.2.1.1. Hacking wscons to add a keymap
If your favourite keymap is not supported, you can start
digging in src/sys/dev/wscons/wsksymdef.h
and src/sys/dev/pckbport/wskbdmap_mfii.c
to make your own. Be sure to send-pr a change-request PR with your work, so others can
make use of it!
You can test your keymap by using wsconsctl instead
of directly hacking the keymaps into the keyboard mapping file. For example, to
say keycode 51 without any modifiers should map to a comma, with shift it should
map to a question mark, with alt it should map to a semicolon and with both alt
and shift it should map to colon, issue the following
command:
wsconsctl -w "map += keycode 51=comma question semicolon colon"
8.1.2.2. Changing the keyboard repeat speed
Keyboard repeat speed can be tuned using the
wsconsctl(8) utility.
There are two variables of interest:
repeat.del1, which specifies the delay before
character repetition starts, and repeat.deln,
which sets the delay between each character repetition (once
started).
Let's see an example, assuming you want to accelerate keyboard
speed. You could do, from the command line:
wsconsctl -w repeat.del1=300
wsconsctl -w repeat.deln=40
Or, if you want this to happen automatically every time
you boot up the system, you could add the following lines to
/etc/wscons.conf:
setvar repeat.del1=300
setvar repeat.deln=40
8.1.3. wsmouse
8.1.3.1. Serial mouse support
The wsmouse device (part of wscons) does not directly
support serial mice. The moused(8) daemon is provided
to read serial mouse data, convert it into wsmouse events
and inject them in wscons' event queue, so the mouse can be
used through the abstraction layer provided by wsmouse.
A typical use can be: moused -p /dev/tty00.
This will try to determine the type of mouse connected to
the first serial port and start reading its data. The
moused(8) man page contains more examples.
8.1.3.2. Cut&paste on the console with wsmoused
It is possible to use the mouse on the wscons console to mark
(cut) text with one mouse button, and insert (paste) it again
with another button.
To do this, enable "wsmoused" in
/etc/rc.conf, and start it:
# echo wsmoused=yes >>/etc/rc.conf
# service wsmoused start
After that you can use the mouse to mark text with the left
mouse button, and paste it with the right one. To tune the
behaviour of wsmoused(8) see its manpage, which also
describes the format of the wsmoused.conf(5) config file,
an example of which can be found in
/usr/share/examples/wsmoused.
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