387 lines
11 KiB
Groff
387 lines
11 KiB
Groff
.\" $NetBSD: wsdisplay.4,v 1.13 2002/06/22 20:16:31 wiz Exp $
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.Dd June 22, 2002
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.Os
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.Dt WSDISPLAY 4
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.Sh NAME
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.Nm wsdisplay
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.Nd generic display device support in wscons
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.Sh SYNOPSIS
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.Cd wsdisplay* at ega? console ?
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(EGA display on ISA)
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.Cd wsdisplay* at vga? console ?
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(VGA display on ISA or PCI)
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.Cd wsdisplay* at pcdisplay? console ?
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(generic PC (ISA) display)
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.Cd wsdisplay* at tga? console ?
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(DEC TGA display, alpha only)
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.Cd wsdisplay* at pfb? console ?
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(PCI framebuffer, bebox only)
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.Cd wsdisplay0 at ofb? console ?
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(Open Firmware framebuffer, macppc only)
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.Cd wsdisplay* at nextdisplay? console ?
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(NeXT display)
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.Cd wsdisplay0 at smg0
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(VAXstation small monochrome display)
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.Cd wsdisplay* at ... kbdmux N
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.Cd options WSDISPLAY_DEFAULTSCREENS=N
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.Sh DESCRIPTION
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The
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.Nm
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driver is an abstraction layer for display devices within the
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.Xr wscons 4
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framework. It attaches to the hardware specific display device
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driver and and makes it available as text terminal or graphics
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interface.
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.Pp
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A display device can have the ability to display characters on it
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(without help of an X server), either directly by hardware or through
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software putting pixel data into the display memory.
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Such displays are called
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.Dq emulating ,
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the
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.Nm
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driver will connect a terminal emulation module and provide a
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tty-like software interface. In contrary, non-emulating displays can only
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be used by special programs like X servers.
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.Pp
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The
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.Em console
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locator in the configuration line refers to the device's use as output
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part of the operating system console. A device specification containing
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a positive value here will only match if the device is in use as system
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console. (The console device selection in early system startup is not
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influenced.) This way, the console device can be connected to a known
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wsdisplay device instance. (Naturally, only
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.Dq emulating
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display devices are usable as console.)
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.Pp
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The
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.Em kbdmux
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locator in the configuration line refers to the
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.Xr wsmux 4
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that will be used to get keyboard events. If this locator is -1 no
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mux will be used.
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.Pp
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The logical unit of an independent contents displayed on a display
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(sometimes referred to as
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.Dq virtual terminal
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) is called a
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.Dq screen
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here. If the underlying device driver supports it, multiple screens can
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be used on one display. (As of this writing, only the
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.Xr vga 4
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and the
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.Tn VAX
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.Dq smg
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display drivers provide this ability.)
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Screens have different minor device numbers and separate tty instances.
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One screen possesses the
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.Dq focus ,
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this means it is visible and its tty device will get
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the keyboard input. (In some cases \- if no screen is set up or if a screen
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was just deleted \- it is possible that no focus is present at all.)
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The focus can be switched by either special keyboard input (typically
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.Tn CTRL-ALT-F Ns Ar n )
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or an ioctl command issued by a user program.
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Screens are created and deleted through the
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.Pa /dev/ttyEcfg
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control device (preferably using the
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.Xr wsconscfg 8
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utility). Alternatively, the compile-time option
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.Dv WSDISPLAY_DEFAULTSCREENS Ns = Ns Ar n
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will also create (at autoconfiguration time)
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.Ar n
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initial screens of the display driver's default type with
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the system's default terminal emulator.
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.Sh IOCTLS
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The following
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.Xr ioctl 2
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calls are provided by the
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.Nm
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driver or by devices which use it. Their definitions are found in
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.Aq Pa dev/wscons/wsconsio.h .
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.Bl -tag -width Dv
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.It Dv WSDISPLAYIO_GTYPE Pq Li int
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Retrieve the type of the display. The list of types is in
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.Aq Pa dev/wscons/wsconsio.h .
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.It Dv WSDISPLAYIO_GINFO Pq Li "struct wsdisplay_fbinfo"
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Retrieve basic information about a framebuffer display.
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The returned structure is as follows:
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.Bd -literal -offset indent
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struct wsdisplay_fbinfo {
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u_int height;
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u_int width;
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u_int depth;
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u_int cmsize;
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};
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.Ed
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.Pp
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The
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.Va height
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and
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.Va width
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members are counted in pixels. The
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.Va depth
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member indicates the number of bits per pixel, and
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.Va cmsize
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indicates the number of color map entries accessible through
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.Dv WSDISPLAYIO_GETCMAP
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and
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.Dv WSDISPLAYIO_PUTCMAP .
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This call is likely to be unavailable on text-only displays.
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.It Dv WSDISPLAYIO_GETCMAP Pq Li "struct wsdisplay_cmap"
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Retrieve the current color map from the display. This call needs the
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following structure set up beforehand:
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.Bd -literal -offset indent
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struct wsdisplay_cmap {
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u_int index;
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u_int count;
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u_char *red;
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u_char *green;
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u_char *blue;
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};
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.Ed
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.Pp
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The
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.Va index
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and
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.Va count
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members specify the range of color map entries to retrieve. The
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.Va red ,
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.Va green ,
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and
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.Va blue
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members should each point to an array of
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.Va count
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.Li u_char Ns s .
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On return, these will be filled in with the appropriate entries from the
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color map. On all displays that support this call, values range from 0
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for minimum intensity to 255 for maximum intensity, even if the display
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does not use eight bits internally to represent intensity.
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.It Dv WSDISPLAYIO_PUTCMAP Pq Li "struct wsdisplay_cmap"
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Change the display's color map. The argument structure is the same as for
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.Dv WSDISPLAYIO_GETCMAP ,
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but
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.Va red ,
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.Va green ,
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and
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.Va blue
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are taken as pointers to the values to use to set the color map.
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This call is not available on displays with fixed color maps.
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.It Dv WSDISPLAYIO_GVIDEO Pq Li int
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Get the current state of the display's video output. Possible values are:
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.Bl -tag -width Dv
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.It Dv WSDISPLAYIO_VIDEO_OFF
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The display is blanked.
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.It Dv WSDISPLAYIO_VIDEO_ON
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The display is enabled.
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.El
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.It Dv WSDISPLAYIO_SVIDEO Pq Li int
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Set the state of the display's video output. See
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.Dv WSDISPLAYIO_GVIDEO
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above for possible values.
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.It Dv WSDISPLAYIO_GCURPOS Pq Li "struct wsdisplay_curpos"
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Retrieve the current position of the hardware cursor. The returned structure
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is as follows:
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.Bd -literal -offset indent
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struct wsdisplay_curpos {
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u_int x, y;
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};
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.Ed
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.Pp
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The
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.Va x
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and
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.Va y
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members count the number of pixels right and down, respectively, from
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the top-left corner of the display to the hot spot of the cursor.
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This call is not available on displays without a hardware cursor.
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.It Dv WSDISPLAYOP_SCURPOS Pq Li "struct wsdisplay_curpos"
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Set the current cursor position. The argument structure, and its semantics,
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are the same as for
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.Dv WSDISPLAYIO_GCURPOS .
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This call is not avilable on displays without a hardware cursor.
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.It Dv WSDISPLAYIO_GCURMAX Pq Li "struct wsdisplay_curpos"
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Retrieve the maximum size of cursor supported by the display. The
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.Va x
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and
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.Va y
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members of the returned structure indicate the maximum number of pixel rows
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and columns, respectively, in a hardware cursor on this display.
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This call is not available on displays without a hardware cursor.
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.It Dv WSDISPLAYIO_GCURSOR Pq Li "struct wsdisplay_cursor"
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Retrieve some or all of the hardware cursor's attributes. The argument
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structure is as follows:
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.Bd -literal -offset indent
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struct wsdisplay_cursor {
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u_int which;
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u_int enable;
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struct wsdisplay_curpos pos;
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struct wsdisplay_curpos hot;
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struct wsdisplay_cmap cmap;
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struct wsdisplay_curpos size;
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u_char *image;
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u_char *mask;
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};
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.Pp
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.Ed
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The
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.Va which
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member indicates which of the values the application requires to be returned.
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It should contain the logical OR of the following flags:
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.Bl -tag -width Dv
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.It Dv WSDISPLAYIO_CURSOR_DOCUR
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Get
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.Va enable ,
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which indicates whether the cursor is currently displayed (non-zero) or
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not (zero).
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.It Dv WSDISPLAYIO_CURSOR_DOPOS
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Get
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.Va pos ,
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which indicates the current position of the cursor on the display, as
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would be returned by
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.Dv WSDISPLAYIO_GCURPOS .
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.It Dv WSDISPLAYIO_CURSOR_DOHOT
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Get
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.Va hot ,
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which indicates the location of the
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.Dq hot spot
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within the cursor. This is the point on the cursor whose position on the
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display is treated as being the position of the cursor by other calls.
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Its location is counted in pixels from the top-right corner of the cursor.
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.It Dv WSDISPLAYIO_CURSOR_DOCMAP
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Get
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.Va cmap ,
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which indicates the current cursor color map.
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Unlike in a call to
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.Dv WSDISPLAYIO_GETCMAP ,
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.Va cmap
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here need not have its
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.Va index
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and
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.Va count
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members initialised. They will be set to 0 and 2 respectively by the call.
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This means that
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.Va cmap . Ns Va red ,
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.Va cmap . Ns Va green ,
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and
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.Va cmap . Ns Va blue
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must each point to at least enough space to hold two
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.Li u_char Ns s .
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.It Dv WSDISPLAYIO_CURSOR_DOSHAPE
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Get
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.Va size , image ,
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and
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.Va mask .
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These are, respectively, the dimensions of the cursor in pixels, the
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bitmap of set pixels in the cursor and the bitmap of opaque pixels in
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the cursor. The format in which these bitmaps are returned, and hence
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the amount of space that must be provided by the application, are
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device-dependent.
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.It Dv WSDISPLAYIO_CURSOR_DOALL
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Get all of the above.
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.El
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.Pp
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The device may elect to return information that was not requested by the user,
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so those elements of
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.Li "struct wsdisplay_cursor"
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which are pointers should be initialised to
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.Dv NULL
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if not otherwise used.
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This call is not available on displays without a hardware cursor.
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.It Dv WSDISPLAYIO_SCURSOR Pq Li "struct wsdisplay_cursor"
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Set some or all of the hardware cursor's attributes. The argument structure
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is the same as for
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.Dv WSDISPLAYIO_GCURSOR .
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The
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.Va which
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member specifies which attributes of the cursor are to be changed.
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It should contain the logical OR of the following flags:
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.Bl -tag -width Dv
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.It Dv WSDISPLAYIO_CURSOR_DOCUR
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If
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.Va enable
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is zero, hide the cursor. Otherwise, display it.
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.It Dv WSDISPLAYIO_CURSOR_DOPOS
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Set the cursor's position on the display to
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.Va pos ,
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the same as
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.Dv WSDISPLAYIO_SCURPOS .
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.It Dv WSDISPLAYIO_CURSOR_DOHOT
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Set the
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.Dq hot spot
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of the cursor, as defined above, to
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.Va hot .
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.It Dv WSDISPLAYIO_CURSOR_DOCMAP
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Set some or all of the cursor color map based on
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.Va cmap .
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The
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.Va index
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and
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.Va count
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elements of
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.Va cmap
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indicate which color map entries to set, and the entries themselves come from
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.Va cmap . Ns Va red ,
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.Va cmap . Ns Va green ,
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and
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.Va cmap . Ns Va blue .
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.It Dv WSDISPLAYIO_CURSOR_DOSHAPE
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Set the cursor shape from
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.Va size , image ,
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and
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.Va mask .
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See above for their meanings.
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.It Dv WSDISPLAYIO_CURSOR_DOALL
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Do all of the above.
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.El
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.Pp
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This call is not available on displays without a hardware cursor.
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.It Dv WSDISPLAYIO_GMODE Pq Li u_int
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Get the current mode of the display. Possible results include:
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.Bl -tag -width Dv
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.It Dv WSDISPLAYIO_MODE_EMUL
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The display is in emulating (text) mode.
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.It Dv WSDISPLAYIO_MODE_MAPPED
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The display is in mapped (graphics) mode.
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.El
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.Pp
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.It Dv WSDISPLAYIO_SMODE Pq Li u_int
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Set the current mode of the display. For possible arguments, see
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.Dv WSDISPLAYIO_GMODE .
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.El
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.Sh FILES
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.Bl -item
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.It
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.Pa /dev/ttyE*
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Terminal devices (per screen).
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.It
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.Pa /dev/ttyEcfg
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Control device.
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.It
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.Pa /usr/include/dev/wscons/wsconsio.h
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.El
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.Sh SEE ALSO
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.Xr ioctl 2 ,
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.Xr ega 4 ,
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.Xr pcdisplay 4 ,
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.Xr tty 4 ,
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.Xr vga 4 ,
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.Xr wscons 4 ,
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.Xr wsconscfg 8 ,
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.Xr wsconsctl 8 ,
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.Xr wsfontload 8
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.Sh BUGS
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The
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.Nm
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code currently limits the number of screens on one display to 8.
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.Pp
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The terms
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.Dq wscons
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and
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.Dq wsdisplay
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are not cleanly distinguished in the code and in manual pages.
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.Pp
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.Dq non-emulating
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display devices are not tested.
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