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RB(4)		      BSD/hp300 Kernel Interfaces Manual		 RB(4)

     rb — HP98720 ``Renaissance'' device interface

     This driver is for the HP98720 and 98721 graphics device, also known as
     the Renaissance.  This driver has not been tested with all possible com‐
     binations 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 Renaissance 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 (see cons(4)).  The hardware
     installation manual describes 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:

	     Get Graphics Info

	     Get info about device, setting the entries in the grfinfo struc‐
	     ture, as defined in ⟨hpdev/grfioctl.h⟩.  For the standard 98720,
	     the number of planes should be 4.	The number of colors would
	     therefore be 15, excluding black.	If one 98722A 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 98722 frame buffer board 4 planes will be added up to
	     a maximum of 32 planes total.

	     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.

	     Graphics Off

	     Turn graphics off by disabling output to the CRT.	The frame buf‐
	     fer contents are not affected.

	     Map Device to user space

	     Map in control registers and framebuffer space. Once the device
	     file is mapped, the frame buffer structure is accessible.	The
	     structure describing the 98720 is defined in hpdev/grf_rbreg.h.

     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 rboxfb *rbox;
     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;
     rbox = (rboxfb *) Addr;			     /* Control Registers   */
     frame_buffer = (u_char *) Addr + gi.gd_regsize; /* Frame buffer memory */

     /dev/grf?		BSD special file
     /dev/ocrt98720	HP-UX starbase special files
     /dev/MAKEDEV.hpux	script for creating HP-UX special files

     None under BSD.  The HP-UX CE.utilities must be used.

     [ENODEV]  no such device.

     [EBUSY]   Another process has the device open.

     [EINVAL]  Invalid ioctl specification.

     ioctl(2), grf(4).

     For extensive code examples using the Renaissance, see the X device
     dependent source.

     Not tested for all configurations of scan board and frame buffer memory

BSD				 June 9, 1993				   BSD

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