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