vga - VGA graphics driver for wscons
vga0 at isa?
vga* at pci?
wsdisplay* at vga? console ?
option PCIAGP
This driver handles VGA graphics hardware within the wscons(4) console
framework. It doesn't provide direct device driver entry
points but
makes its functions available via the internal wsdisplay(4)
interface.
The vga driver supports multiple virtual screens on one
physical display.
The screens allocated on one display can be of different
``types'', where
a type refers to various display properties. The type is
determined at
the time the virtual screen is created and can't be changed
later.
Screens are either created at kernel startup (then the default type is
used) or later with help of the wsconscfg(8) utility.
Currently, the following screen types are supported:
80x25 This is the standard VGA text mode with 80 columns
and 25 rows.
16 different colors can be displayed at the same
time. Characters
are 8 x 16 pixels large, and a font consists of
256 characters.
A built-in font of this size is always present on a VGA
card. It's also possible to use a downloaded font
instead.
80x25bf A modified version of the previous. It only allows
8 colors to
be displayed. In exchange, it can access two fonts
at the same
time, so that 512 different characters can be displayed.
80x40 A text mode with 80 columns and 40 rows. Similar to
the standard
mode, 16 colors and 256 characters are available.
Characters are
8 x 10 pixels large. For this mode to be useful, a
font of that
character size must be downloaded.
80x40bf A modified version of the previous. It only allows
8 colors to
be displayed. In exchange, it can access two fonts
at the same
time, so that 512 different characters can be displayed.
80x50 A text mode with 80 columns and 50 rows. Similar to
the standard
mode, 16 colors and 256 characters are available.
Characters are
8 x 8 pixels large. For this mode to be useful, a
font of that
character size must be downloaded.
80x50bf A modified version of the previous. It only allows
8 colors to
be displayed. In exchange, it can access two fonts
at the same
time, so that 512 different characters can be displayed.
80x24 A variant of the ``80x25'' screen type which displays 24 lines
only. It uses the standard 8x16 VGA font. This
mode might be
useful for applications which depend on closer DEC
VT100 compatibility.
80x24bf A modified version of the previous. It only allows
8 colors to
be displayed. In exchange, it can access two fonts
at the same
time, so that 512 different characters can be displayed.
The vga driver can display fonts of the original IBM type
and ISO-8859-1
encoded fonts. As an experimental feature, the ``higher
half'' fonts of
the former OpenBSD/i386 pcvt driver distribution can be used
too if
option WSCONS_SUPPORT_PCVTFONTS was set at kernel compile
time. This is
only useful with the ``*bf'' screen types; a font containing
the ASCII
range of characters must be available too on this screen.
option PCIAGP enables support for the AGP GART programming
through the
ioctl(2), for use by the XFree86(1) on some architectures.
intro(4), isa(4), pcdisplay(4), pci(4), wscons(4), wsdisplay(4),
wsconscfg(8), wsfontload(8)
Only a subset of the possible text modes is supported.
VGA cards are supposed to emulate an MDA if a monochrome
display is connected.
In this case, the device will naturally not support
colors at
all, but offer the capability to display underlined characters instead.
The ``80x25bf'', ``80x40bf'', ``80x50bf'', and ``80x24bf''
screen types
will not be available. This mode of operation is not tested.
OpenBSD 3.6 March 20, 1999
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