/* $Xorg: btreg.h,v 1.3 2000/08/17 19:48:36 cpqbld Exp $ */ /* * Copyright (c) 1993 * The Regents of the University of California. All rights reserved. * * This software was developed by the Computer Systems Engineering group * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and * contributed to Berkeley. * * 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, Lawrence Berkeley Laboratory. * * 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. * * @(#)btreg.h 8.2 (Berkeley) 1/21/94 */ /* $NetBSD: btreg.h,v 1.2 1994/11/20 20:51:55 deraadt Exp $ */ /* $XFree86: xc/programs/Xserver/hw/sunLynx/btreg.h,v 3.2 2001/01/17 22:36:52 dawes Exp $ */ /* * Several Sun color frame buffers use some kind of Brooktree video * DAC (e.g., the Bt458, -- in any case, Brooktree make the only * decent color frame buffer chips). * * Color map control on these is a bit funky in a SPARCstation. * To update the color map one would normally do byte writes, but * the hardware takes longword writes. Since there are three * registers for each color map entry (R, then G, then B), we have * to set color 1 with a write to address 0 (setting 0's R/G/B and * color 1's R) followed by a second write to address 1 (setting * color 1's G/B and color 2's R/G). Software must therefore keep * a copy of the current map. * * The colormap address register increments automatically, so the * above write is done as: * * bt->bt_addr = 0; * bt->bt_cmap = R0G0B0R1; * bt->bt_cmap = G1B1R2G2; * ... * * Yow! * * Bonus complication: on the cg6, only the top 8 bits of each 32 bit * register matter, even though the cg3 takes all the bits from all * bytes written to it. */ struct bt_regs { u_int bt_addr; /* map address register */ u_int bt_cmap; /* colormap data register */ u_int bt_ctrl; /* control register */ u_int bt_omap; /* overlay (cursor) map register */ };