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-.\" Copyright (c) 2003, Sun Microsystems, Inc.
-.\" Copyright (c) 2017, Joyent, Inc.
-.\" The contents of this file are subject to the terms of the
-.\" Common Development and Distribution License (the "License").
-.\" You may not use this file except in compliance with the License.
-.\"
-.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
-.\" or http://www.opensolaris.org/os/licensing.
-.\" See the License for the specific language governing permissions
-.\" and limitations under the License.
-.\"
-.\" When distributing Covered Code, include this CDDL HEADER in each
-.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
-.\" If applicable, add the following below this CDDL HEADER, with the fields
-.\" enclosed by brackets "[]" replaced with your own identifying
-.\" information: Portions Copyright [yyyy] [name of copyright owner]
-.Dd October 22, 2017
-.Dt FBIO 7I
-.Os
-.Sh NAME
-.Nm fbio
-.Nd frame buffer control operations
-.Sh DESCRIPTION
-The frame buffers provided with this release support the same general interface
-that is defined by
-.In sys/fbio.h .
-Each responds to an
-.Dv FBIOGTYPE
-.Xr ioctl 2
-request which returns information in a
-.Vt fbtype
-structure.
-.Pp
-Each device has an
-.\" FBTYPE isn't macro, enum, or type, just used to describe a number of
-.\" CPP-macros of the form #define FBTYPE_xxxx
-.Sy FBTYPE
-which is used by higher-level software to
-determine how to perform graphics functions.
-Each device is used by opening it, doing an
-.Dv FBIOGTYPE
-.Xr ioctl 2
-to see which frame buffer type is
-present, and thereby selecting the appropriate device-management routines.
-.Pp
-.Dv FBIOGINFO
-returns information specific to the GS accelerator.
-.Pp
-.Dv FBIOSVIDEO
-and
-.Dv FBIOGVIDEO
-are general-purpose
-.Xr ioctl 2
-requests for controlling possible video features of frame buffers.
-These
-.Xr ioctl 2
-requests either set or return the value of a flags integer.
-At this point, only the
-.Dv FBVIDEO_ON
-option is available, controlled by
-.Dv FBIOSVIDEO .
-.Dv FBIOGVIDEO
-returns the current video state.
-.Pp
-The
-.Dv FBIOSATTR
-and
-.Dv FBIOGATTR
-.Xr ioctl 2
-requests allow access to special features of newer frame buffers.
-They use the
-.Vt fbsattr
-and
-.Vt fbgattr
-structures.
-.Pp
-Some color frame buffers support the
-.Dv FBIOPUTCMAP
-and
-.Dv FBIOGETCMAP
-.Xr ioctl 2
-requests, which provide access to the colormap.
-They use the
-.Vt fbcmap
-structure.
-.Pp
-Also, some framebuffers with multiple colormaps will either encode the colormap
-identifier in the high-order bits of the
-.Dq index
-field in the
-.Vt fbcmap
-structure, or use the
-.Dv FBIOPUTCMAPI
-and
-.Dv FBIOGETCMAPI
-.Xr ioctl 2
-requests.
-.Pp
-.Dv FBIOVERTICAL
-is used to wait for the start of the next vertical retrace
-period.
-.Pp
-.Dv FBIOVRTOFFSET
-Returns the offset to a read-only
-.Dq Em vertical retrace page
-for those framebuffers that support it.
-This vertical retrace page may be mapped into user space with
-.Xr mmap 2 .
-The first word of the vertical
-retrace page (type
-.Vt "unsigned int" )
-is a counter that is incremented every time there is a vertical retrace.
-The user process can use this counter in a variety of ways.
-.Pp
-.Dv FBIOMONINFO
-returns a
-.Vt mon_info
-structure which contains information about
-the monitor attached to the framebuffer, if available.
-.Pp
-.Dv FBIOSCURSOR ,
-.Dv FBIOGCURSOR ,
-.Dv FBIOSCURPOS
-and
-.Dv FBIOGCURPOS
-are used to control the hardware cursor for those framebuffers that have this
-feature.
-.Dv FBIOGCURMAX
-returns the maximum sized cursor supported by the framebuffer.
-Attempts to create a cursor larger than this will fail.
-.Pp
-Finally
-.Dv FBIOSDEVINFO
-and
-.Dv FBIOGDEVINFO
-are used to transfer
-variable-length, device-specific information into and out of framebuffers.
-.Sh SEE ALSO
-.Xr ioctl 2 ,
-.Xr mmap 2 ,
-.Xr cgsix 7D
-.Sh BUGS
-The
-.Dv FBIOSATTR
-and
-.Dv FBIOGATTR
-.Xr ioctl 2
-requests are only
-supported by frame buffers which emulate older frame buffer types.
-If a frame buffer emulates another frame buffer,
-.Dv FBIOGTYPE
-returns the emulated type.
-To get the real type, use
-.Dv FBIOGATTR .
-.Pp
-The
-.Dv FBIOGCURPOS
-ioctl was incorrectly defined in previous operating
-systems, and older code running in binary compatibility mode may get incorrect
-results.