1 /* $NetBSD: bt_subr.c,v 1.9 2005/12/11 12:19:20 christos 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 1.9 2005/12/11 12:19:20 christos 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 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 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