231 lines
6.7 KiB
Groff
231 lines
6.7 KiB
Groff
.\" Copyright (c) 2014 Warren Block
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd May 9, 2014
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.Dt "VIRTUAL TERMINALS" 4
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.Os
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.Sh NAME
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.Nm vt
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.Nd virtual terminal console driver
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.Sh SYNOPSIS
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.Cd "options VT_MAXWINDOWS=N"
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.Cd "options VT_ALT_TO_ESC_HACK=1"
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.Cd "options VT_TWOBUTTON_MOUSE"
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.Cd "options VT_FB_DEFAULT_WIDTH=X"
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.Cd "options VT_FB_DEFAULT_HEIGHT=Y"
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.Cd "options SC_NO_CUTPASTE"
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.Cd "options SC_NO_SYSMOUSE"
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.Cd "device vt"
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.Pp
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In
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.Xr loader.conf 5 :
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.Cd hw.vga.textmode=1
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.Sh DESCRIPTION
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The
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.Nm
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device provides multiple virtual terminals with an extensive feature
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set:
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.Bl -item -offset indent
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.It
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Unicode UTF-8 text with double-width characters.
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.It
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Large font maps in graphics mode, including support for Asian
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character sets.
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.It
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Graphics-mode consoles.
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.It
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Integration with
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KMS
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.Pq Kernel Mode Setting
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video drivers for switching between the
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.Em X Window System
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and virtual terminals.
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.El
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.Ss Virtual Terminals
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Multiple virtual terminals are provided on a single computer.
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Up to sixteen virtual terminals can be defined.
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A single virtual terminal is connected to the screen and keyboard
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at a time.
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Key combinations are used to select a virtual terminal.
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Alt-F1 through Alt-F12 correspond to the first twelve virtual terminals.
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If more than twelve virtual terminals are created, Shift-Alt-F1 through
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Shift-Alt-F4 are used to switch to the additional terminals.
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.Ss Copying and Pasting Text with a Mouse
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Copying and pasting text from the screen with a mouse is supported.
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Press and hold down mouse button 1, usually the left button, while
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moving the mouse to select text.
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Selected text is highlighted with reversed foreground and background
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colors.
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To select more text after releasing mouse button 1, press mouse button
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3, usually the right button.
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To paste text that has been selected, press mouse button 2, usually the
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middle button.
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The text is entered as if it were typed at the keyboard.
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The
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.Dv VT_TWOBUTTON_MOUSE
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kernel option can be used with mice that only have two buttons.
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Setting this option makes the second mouse button into the
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paste button.
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See
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.Xr moused 8
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for more information.
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.Ss Scrolling Back
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Output that has scrolled off the screen can be reviewed by pressing the
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Scroll Lock key, then scrolling up and down with the arrow keys.
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The Page Up and Page Down keys scroll up or down a full screen at a
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time.
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The Home and End keys jump to the beginning or end of the scrollback
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buffer.
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When finished reviewing, press the Scroll Lock key again to return to
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normal use.
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.Sh DRIVER CONFIGURATION
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.Ss Kernel Configuration Options
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These kernel options control the
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.Nm
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driver.
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.Bl -tag -width MAXCONS
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.It Dv VT_MAXWINDOWS=N
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Set the number of virtual terminals to be created to
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.Fa N .
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The value defaults to 12.
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.It Dv VT_ALT_TO_ESC_HACK=1
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When the Alt key is held down while pressing another key, send an ESC
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sequence instead of the Alt key.
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.It Dv VT_TWOBUTTON_MOUSE
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If defined, swap the functions of mouse buttons 2 and 3.
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In effect, this makes the right-hand mouse button perform a paste.
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These options are checked in the order shown.
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.It Dv SC_NO_CUTPASTE
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Disable mouse support.
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.It VT_FB_DEFAULT_WIDTH=X
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Set the default width to
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.Fa X .
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.It VT_FB_DEFAULT_HEIGHT=Y
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Set the default height to
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.Fa Y .
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.El
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.Sh BACKWARDS COMPATIBILITY
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Several options are provided for compatibility with the previous
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console device,
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.Xr sc 4 .
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These options will be removed in a future
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.Fx
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version.
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.Bl -column -offset indent ".Sy vt VT_TWOBUTTON_MOUSE" ".Sy SC_TWOBUTTON_MOUSE"
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.It Sy vt Option Name Ta Sy sc Option Name
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.It Dv VT_TWOBUTTON_MOUSE Ta Dv SC_TWOBUTTON_MOUSE
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.It Dv VT_MAXWINDOWS Ta Dv MAXCONS
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.It none Ta Dv SC_NO_CUTPASTE
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.It none Ta Dv SC_NO_SYSMOUSE
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.El
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.Sh START-UP OPERATION WITH X86 BIOS SYSTEMS
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The computer BIOS starts in text mode, and
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the
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.Fx
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.Xr loader 8
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runs, loading the kernel.
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If
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.Va hw.vga.textmode
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is set, the system remains in text mode.
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Otherwise,
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.Nm
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switches to 640x480x16 VGA mode using
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.Fn vt_vga .
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If a KMS
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.Pq Kernel Mode Switching
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video driver is available, the display is switched to high resolution
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and the KMS driver takes over.
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When a KMS driver is not available,
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.Fn vt_vga
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remains active.
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.Sh LOADER TUNABLES
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These settings can be entered at the
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.Xr loader 8
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prompt or in
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.Xr loader.conf 5 .
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.Bl -tag -width indent
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.It Va hw.vga.textmode
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Set to 1 to use virtual terminals in text mode instead of graphics mode.
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Features that require graphics mode, like loadable fonts, will be
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disabled.
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.El
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.Sh FILES
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.Bl -tag -width /usr/share/syscons/keymaps/* -compact
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.It Pa /dev/console
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.It Pa /dev/consolectl
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.It Pa /dev/ttyv*
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virtual terminals
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.It Pa /etc/ttys
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terminal initialization information
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.El
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.Sh SEE ALSO
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.Xr kbdcontrol 1 ,
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.Xr login 1 ,
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.Xr vidcontrol 1 ,
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.Xr atkbd 4 ,
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.Xr atkbdc 4 ,
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.Xr keyboard 4 ,
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.Xr screen 4 ,
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.Xr splash 4 ,
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.Xr syscons 4 ,
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.Xr ukbd 4 ,
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.Xr vga 4 ,
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.Xr kbdmap 5 ,
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.Xr rc.conf 5 ,
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.Xr ttys 5 ,
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.Xr config 8 ,
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.Xr getty 8 ,
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.Xr kbdmux 8 ,
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.Xr kldload 8 ,
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.Xr moused 8
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.\" WB: to be uncommented when an actual release contains vt(4)
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.\" .Sh HISTORY
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.\" The
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.\" Nm
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.\" driver first appeared in
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.\" .Fx 9.3 .
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm
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device driver was developed by
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.An Ed Schouten Aq Mt ed@FreeBSD.org ,
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.An Ed Maste Aq Mt emaste@FreeBSD.org ,
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and
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.An Aleksandr Rybalko Aq Mt ray@FreeBSD.org ,
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with sponsorship provided by the
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.Fx
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Foundation.
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This manual page was written by
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.An Warren Block Aq Mt wblock@FreeBSD.org .
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.Sh CAVEATS
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Paste buffer size is limited by the system value
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.Brq Dv MAX_INPUT ,
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the number of bytes that can be stored in the terminal
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input queue, usually 1024 bytes
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(see
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.Xr termios 4 ) .
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