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Annotation of sys/arch/sparc/dev/btvar.h, Revision 1.1.1.1

1.1       nbrk        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 */