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authorReinhard Tartler <siretart@tauware.de>2011-10-10 17:43:39 +0200
committerReinhard Tartler <siretart@tauware.de>2011-10-10 17:43:39 +0200
commitf4092abdf94af6a99aff944d6264bc1284e8bdd4 (patch)
tree2ac1c9cc16ceb93edb2c4382c088dac5aeafdf0f /nx-X11/programs/Xserver/hw/sunLynx/btreg.h
parenta840692edc9c6d19cd7c057f68e39c7d95eb767d (diff)
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Summary: Imported nx-X11-3.1.0-1.tar.gz Keywords: Imported nx-X11-3.1.0-1.tar.gz into Git repository
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+/* $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 3.1 1996/12/27 06:51:31 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 */
+};