bt_subr.c revision 1.10 1 1.10 tsutsui /* $NetBSD: bt_subr.c,v 1.10 2024/12/20 23:51:59 tsutsui Exp $ */
2 1.1 gwr
3 1.1 gwr /*
4 1.1 gwr * Copyright (c) 1993
5 1.1 gwr * The Regents of the University of California. All rights reserved.
6 1.1 gwr *
7 1.1 gwr * This software was developed by the Computer Systems Engineering group
8 1.1 gwr * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
9 1.1 gwr * contributed to Berkeley.
10 1.1 gwr *
11 1.1 gwr * All advertising materials mentioning features or use of this software
12 1.1 gwr * must display the following acknowledgement:
13 1.1 gwr * This product includes software developed by the University of
14 1.1 gwr * California, Lawrence Berkeley Laboratory.
15 1.1 gwr *
16 1.1 gwr * Redistribution and use in source and binary forms, with or without
17 1.1 gwr * modification, are permitted provided that the following conditions
18 1.1 gwr * are met:
19 1.1 gwr * 1. Redistributions of source code must retain the above copyright
20 1.1 gwr * notice, this list of conditions and the following disclaimer.
21 1.1 gwr * 2. Redistributions in binary form must reproduce the above copyright
22 1.1 gwr * notice, this list of conditions and the following disclaimer in the
23 1.1 gwr * documentation and/or other materials provided with the distribution.
24 1.7 agc * 3. Neither the name of the University nor the names of its contributors
25 1.1 gwr * may be used to endorse or promote products derived from this software
26 1.1 gwr * without specific prior written permission.
27 1.1 gwr *
28 1.1 gwr * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 1.1 gwr * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 1.1 gwr * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 1.1 gwr * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 1.1 gwr * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 1.1 gwr * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 1.1 gwr * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 1.1 gwr * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 1.1 gwr * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 1.1 gwr * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 1.1 gwr * SUCH DAMAGE.
39 1.1 gwr *
40 1.1 gwr * @(#)bt_subr.c 8.2 (Berkeley) 1/21/94
41 1.1 gwr */
42 1.6 lukem
43 1.6 lukem #include <sys/cdefs.h>
44 1.10 tsutsui __KERNEL_RCSID(0, "$NetBSD: bt_subr.c,v 1.10 2024/12/20 23:51:59 tsutsui Exp $");
45 1.1 gwr
46 1.1 gwr #include <sys/param.h>
47 1.1 gwr #include <sys/buf.h>
48 1.1 gwr #include <sys/errno.h>
49 1.1 gwr
50 1.4 thorpej #include <dev/sun/fbio.h>
51 1.1 gwr
52 1.2 gwr #include "btreg.h"
53 1.2 gwr #include "btvar.h"
54 1.1 gwr
55 1.1 gwr /*
56 1.1 gwr * Common code for dealing with Brooktree video DACs.
57 1.1 gwr * (Contains some software-only code as well, since the colormap
58 1.1 gwr * ioctls are shared between the cgthree and cgsix drivers.)
59 1.1 gwr */
60 1.1 gwr
61 1.1 gwr /*
62 1.1 gwr * Implement an FBIOGETCMAP-like ioctl.
63 1.1 gwr */
64 1.10 tsutsui int
65 1.8 chs bt_getcmap(struct fbcmap *p, union bt_cmap *cm, int cmsize)
66 1.1 gwr {
67 1.3 tsutsui u_int i, start, count;
68 1.3 tsutsui u_char *cp;
69 1.1 gwr
70 1.1 gwr start = p->index;
71 1.1 gwr count = p->count;
72 1.5 itojun if (start >= cmsize || count > cmsize - start)
73 1.1 gwr return (EINVAL);
74 1.1 gwr if (!useracc(p->red, count, B_WRITE) ||
75 1.1 gwr !useracc(p->green, count, B_WRITE) ||
76 1.1 gwr !useracc(p->blue, count, B_WRITE))
77 1.1 gwr return (EFAULT);
78 1.1 gwr for (cp = &cm->cm_map[start][0], i = 0; i < count; cp += 3, i++) {
79 1.1 gwr p->red[i] = cp[0];
80 1.1 gwr p->green[i] = cp[1];
81 1.1 gwr p->blue[i] = cp[2];
82 1.1 gwr }
83 1.1 gwr return (0);
84 1.1 gwr }
85 1.1 gwr
86 1.1 gwr /*
87 1.1 gwr * Implement the software portion of an FBIOPUTCMAP-like ioctl.
88 1.1 gwr */
89 1.10 tsutsui int
90 1.8 chs bt_putcmap(struct fbcmap *p, union bt_cmap *cm, int cmsize)
91 1.1 gwr {
92 1.3 tsutsui u_int i, start, count;
93 1.3 tsutsui u_char *cp;
94 1.1 gwr
95 1.1 gwr start = p->index;
96 1.1 gwr count = p->count;
97 1.5 itojun if (start >= cmsize || count > cmsize - start)
98 1.1 gwr return (EINVAL);
99 1.1 gwr if (!useracc(p->red, count, B_READ) ||
100 1.1 gwr !useracc(p->green, count, B_READ) ||
101 1.1 gwr !useracc(p->blue, count, B_READ))
102 1.1 gwr return (EFAULT);
103 1.1 gwr for (cp = &cm->cm_map[start][0], i = 0; i < count; cp += 3, i++) {
104 1.1 gwr cp[0] = p->red[i];
105 1.1 gwr cp[1] = p->green[i];
106 1.1 gwr cp[2] = p->blue[i];
107 1.1 gwr }
108 1.1 gwr return (0);
109 1.1 gwr }
110