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.\" $OpenBSD: gb.4,v 1.6 2002/10/01 07:12:30 miod Exp $
.\"
.\" Copyright (c) 1990, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" the Systems Programming Group of the University of Utah Computer
.\" Science Department.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" This product includes software developed by the University of
.\" California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" from: @(#)gb.4 8.1 (Berkeley) 6/9/93
.\"
.Dd June 9, 1993
.Dt GB 4 hp300
.Os
.Sh NAME
.Nm gb
.Nd
.Tn HP98700
``Gatorbox'' frame buffer
.Sh SYNOPSIS
.Cd "gbox* at intio?"
.Cd "gbox* at dio? scode ?"
.Cd "grf* at gbox?"
.Sh DESCRIPTION
This driver is for the
.Tn HP98700
and 98710 graphics devices, also known as
the Gatorbox.
The term ``Gator'' will often be used, and it is not to be
confused with ``Gator'' used in reference to an
.Tn HP
9837 or 200/237 machine.
Also, the term Gatorbox is used for the 98700 alone, with the 98701 frame
buffer memory or with the 98710 accelerator installed.
This driver merely checks for the existence of the device and does minimal
set up, as it is expected the applications will initialize the device to their
requirements.
.Pp
The 98700 can be used as the only graphics device on a system, in which case
it will be used as the system console.
It can also be installed as a secondary display device.
For the first case, the
.Tn HP
.Tn 98287A M.A.D.
interface card
should be set to internal control space.
This will put the frame buffer at the DIO address 0x200000 and the control
registers at 0x560000.
At this address it will be the ``preferred'' console device (see
.Xr cons 4 ) .
For use as a secondary device,
the 98287A should be set to frame buffer address 0x300000,
and to an external select code.
.Pp
It should be noted that this configuration will conflict with the 98547
display card which has a 2 megabyte frame buffer starting at address 0x200000.
The 98700 should only be installed as a secondary device in a machine with a
1 bit 98544 display card or 4 bit 98545 card.
The
.%T 98700H Installation Guide
contains further configuration information.
.Pp
The
.Xr ioctl 2
calls supported by the
.Ox
system for the Gatorbox are:
.Bl -tag -width indent
.It Dv GRFIOCGINFO
Get Graphics Info
.Pp
Get info about device, setting the entries in the
.Em grfinfo
structure, as defined in
.Aq Pa machine/grfioctl.h .
For the standard 98700, the number of planes should be 4.
The number of colors would therefore be 15, excluding black.
With the 98701 option installed there will be another 4 planes for a total of 8,
giving 255 colors.
.It Dv GRFIOCON
Graphics On
.Pp
Turn graphics on by enabling
.Tn CRT
output.
The screen will come on, displaying whatever is in the frame buffer, using
whatever colormap is in place.
.It Dv GRFIOCOFF
Graphics Off
.Pp
Turn graphics off by disabling output to the
.Tn CRT .
The frame buffer contents
are not affected.
.It Dv GRFIOCMAP
Map Device to user space
.Pp
Map in control registers and frame buffer space.
Once the device file is mapped, the frame buffer structure is accessible.
The frame buffer structure describing the 98700
is given in
.Aq Pa machine/grf_gbreg.h .
.It Dv GRFIOCUNMAP
Unmap Device
.Pp
Unmap control registers and frame buffer space.
.Pp
For further information about the use of ioctl see the man page.
.El
.Sh FILES
.Bl -tag -width /dev/XXXX -compact
.It Pa /dev/grf?
.Ox
special file
.El
.Sh EXAMPLES
A small example of opening, mapping and using the device is given below.
.Bd -literal
struct gboxfb *gbox;
u_char *Addr, frame_buffer;
struct grfinfo gi;
int disp_fd;
disp_fd = open("/dev/grf0", O_WRONLY);
if (ioctl(disp_fd, GRFIOCGINFO, &gi) < 0) return -1;
ioctl(disp_fd, GRFIOCON, 0);
if (ioctl(disp_fd, GRFIOCMAP, &Addr) < 0) {
ioctl (disp_fd, GRFIOCOFF, 0);
return -1;
}
gbox = (gboxfb *)Addr; /* Control Registers */
frame_buffer = (u_char *)Addr + gi.gd_regsize; /* Frame buffer memory */
.Ed
.Sh DIAGNOSTICS
None under
.Ox .
The
.Tn HP-UX
.Tn CE.utilities/Crtadjust
programs must be used.
.Sh SEE ALSO
.Xr ioctl 2 ,
.Xr dv 4 ,
.Xr grf 4 ,
.\" .Xr hyper 4 ,
.Xr intro 4 ,
.Xr rb 4 ,
.Xr tc 4
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