DVBOX(4) NetBSD/hp300 Programmer's Manual DVBOX(4)
NAME
dvbox - HP98730 ``DaVinci'' graphics device interface
DESCRIPTION
This driver is for the HP98730 and 98731 graphics device, also known as the DaVinci. This driver has not been tested with all possible combina- tions of frame buffer boards and scan boards installed in the device. The driver merely checks for the existence of the device and does minimal set up. The DaVinci can be configured at either the ``internal'' address (frame buffer address 0x200000, control register space address 0x560000) or at an external select code less than 32. At the internal address it will be the ``preferred'' console device. The hardware installation manual de- scribes the procedure for setting these values. A user process communicates to the device initially by means of ioctl(2) calls. For the HP-UX ioctl(2) calls supported, refer to HP-UX manuals. The BSD calls supported are: GRFIOCGINFO Get Graphics Info Get info about device, setting the entries in the grfinfo struc- ture, as defined in <hpdev/grfioctl.h>. For the standard 98730, the number of planes should be 4. The number of colors would therefore be 15, excluding black. If one 98732A frame buffer board is installed, there will still be 4 planes, with the 4 planes on the colormap board becoming overlay planes. With each additional 98732 frame buffer board 4 planes will be added up to a maximum of 32 planes total. GRFIOCON Graphics On Turn graphics on by enabling CRT output. The screen will come on, displaying whatever is in the frame buffer, using whatever colormap is in place. GRFIOCOFF Graphics Off Turn graphics off by disabling output to the CRT. The frame buffer contents are not affected. GRFIOCMAP Map Device to user space Map in control registers and frame buffer space. Once the device file is mapped, the frame buffer structure is accessible. The structure describing the 98730 is defined in <hpdev/grf_dvreg.h>.
FILES
/dev/grf? BSD special file /dev/crt98730 /dev/ocrt98730 HP-UX starbase special files /dev/MAKEDEV.hpux script for creating HP-UX special files
EXAMPLES
This is a short segment of code showing how the device is opened and mapped into user process address space assuming that it is `grf0': struct dvboxfb *dvbox; u_char *Addr, frame_buffer; struct grfinfo gi; int disp_fd; disp_fd = open("/dev/grf0",1); if (ioctl (disp_fd, GRFIOCGINFO, &gi) < 0) return -1; (void) ioctl (disp_fd, GRFIOCON, 0); Addr = (u_char *) 0; if (ioctl (disp_fd, GRFIOCMAP, &Addr) < 0) { (void) ioctl (disp_fd, GRFIOCOFF, 0); return -1; } dvbox = (dvboxfb *) Addr; /* Control Registers */ frame_buffer=(u_char *)Addr+gi.gd_regsize; /* Frame buffer memory */
DIAGNOSTICS
None under BSD. HP-UX CE.utilities must be used.
ERRORS
[ENODEV] no such device. [EBUSY] Another process has the device open. [EINVAL] Invalid ioctl specification.
SEE ALSO
ioctl(2), grf(4)
BUGS
Not tested for all configurations of scan board and frame buffer memory boards. NetBSD 1.6 June 9, 1993 2
Powered by man-cgi (2024-08-26). Maintained for NetBSD by Kimmo Suominen. Based on man-cgi by Panagiotis Christias.