1 /* $OpenBSD: btvar.h,v 1.5 2003/06/02 23:27:53 millert Exp $ */ 2 /* $NetBSD: btvar.h,v 1.2 1994/11/20 20:51:56 deraadt Exp $ */ 3 4 /* 5 * Copyright (c) 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This software was developed by the Computer Systems Engineering group 9 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 10 * contributed to Berkeley. 11 * 12 * All advertising materials mentioning features or use of this software 13 * must display the following acknowledgement: 14 * This product includes software developed by the University of 15 * California, Lawrence Berkeley Laboratory. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions 19 * are met: 20 * 1. Redistributions of source code must retain the above copyright 21 * notice, this list of conditions and the following disclaimer. 22 * 2. Redistributions in binary form must reproduce the above copyright 23 * notice, this list of conditions and the following disclaimer in the 24 * documentation and/or other materials provided with the distribution. 25 * 3. Neither the name of the University nor the names of its contributors 26 * may be used to endorse or promote products derived from this software 27 * without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 39 * SUCH DAMAGE. 40 * 41 * @(#)btvar.h 8.2 (Berkeley) 1/21/94 42 */ 43 44 /* 45 * Brooktree color frame buffer state variables (see btreg.h). 46 * 47 * Unfortunately, remarkably little code can be shared between the 48 * cg3 and cg6 drivers here, as the cg3 registers do longword-ops 49 * `as expected', but the cg6 ones use only the upper byte. 50 * 51 * Still, the software color map manipulation is not completely trivial. 52 */ 53 union bt_cmap { 54 u_char cm_map[256][3]; /* 256 R/G/B entries */ 55 u_int cm_chip[256 * 3 / 4]; /* the way the chip gets loaded */ 56 }; 57 58 /* 59 * Routines in bt_subr.c. 60 */ 61 int bt_getcmap(union bt_cmap *, struct wsdisplay_cmap *); 62 int bt_putcmap(union bt_cmap *, struct wsdisplay_cmap *); 63 void bt_loadcmap(union bt_cmap *, volatile struct bt_regs *, 64 u_int, u_int, int); 65 void bt_setcolor(union bt_cmap *, volatile struct bt_regs *, 66 u_int, u_int8_t, u_int8_t, u_int8_t, int); 67 68 /* 69 * Compute (x / 4) * 3 and (x / 4) * 4. These are used in turning 70 * RGB indices (which are in multiples of three) into `chip RGB' values 71 * (which are in multiples of four). 72 */ 73 #define BT_D4M3(x) ((((x) >> 2) << 1) + ((x) >> 2)) /* (x / 4) * 3 */ 74 #define BT_D4M4(x) ((x) & ~3) /* (x / 4) * 4 */ 75