81 lines
3.5 KiB
C
81 lines
3.5 KiB
C
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/* $NetBSD: btreg.h,v 1.1 1995/03/10 01:50:41 gwr Exp $ */
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/*
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* Copyright (c) 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Lawrence Berkeley Laboratory.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)btreg.h 8.2 (Berkeley) 1/21/94
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*/
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/*
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* Several Sun color frame buffers use some kind of Brooktree video
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* DAC (e.g., the Bt458, -- in any case, Brooktree make the only
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* decent color frame buffer chips).
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*
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* Color map control on these is a bit funky in a SPARCstation.
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* To update the color map one would normally do byte writes, but
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* the hardware takes longword writes. Since there are three
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* registers for each color map entry (R, then G, then B), we have
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* to set color 1 with a write to address 0 (setting 0's R/G/B and
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* color 1's R) followed by a second write to address 1 (setting
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* color 1's G/B and color 2's R/G). Software must therefore keep
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* a copy of the current map.
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*
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* The colormap address register increments automatically, so the
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* above write is done as:
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*
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* bt->bt_addr = 0;
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* bt->bt_cmap = R0G0B0R1;
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* bt->bt_cmap = G1B1R2G2;
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* ...
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*
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* Yow!
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*
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* Bonus complication: on the cg6, only the top 8 bits of each 32 bit
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* register matter, even though the cg3 takes all the bits from all
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* bytes written to it.
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*/
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struct bt_regs {
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u_int bt_addr; /* map address register */
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u_int bt_cmap; /* colormap data register */
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u_int bt_ctrl; /* control register */
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u_int bt_omap; /* overlay (cursor) map register */
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};
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