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/* $OpenBSD: bt_subr.c,v 1.3 2002/08/02 16:13:07 millert Exp $ */
/* $NetBSD: bt_subr.c,v 1.2 1995/04/10 22:12:48 gwr Exp $ */
/*
* Copyright (c) 1993
* The Regents of the University of California. All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Lawrence Berkeley Laboratory.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)bt_subr.c 8.2 (Berkeley) 1/21/94
*/
#include <sys/param.h>
#include <sys/buf.h>
#include <sys/errno.h>
#include <machine/fbio.h>
#include "btreg.h"
#include "btvar.h"
/*
* Common code for dealing with Brooktree video DACs.
* (Contains some software-only code as well, since the colormap
* ioctls are shared between the cgthree and cgsix drivers.)
*/
/*
* Implement an FBIOGETCMAP-like ioctl.
*/
int
bt_getcmap(p, cm, cmsize)
register struct fbcmap *p;
union bt_cmap *cm;
int cmsize;
{
register u_int i, start, count;
register u_char *cp;
start = p->index;
count = p->count;
if (start >= cmsize || count > cmsize - start)
return (EINVAL);
if (!useracc(p->red, count, B_WRITE) ||
!useracc(p->green, count, B_WRITE) ||
!useracc(p->blue, count, B_WRITE))
return (EFAULT);
for (cp = &cm->cm_map[start][0], i = 0; i < count; cp += 3, i++) {
p->red[i] = cp[0];
p->green[i] = cp[1];
p->blue[i] = cp[2];
}
return (0);
}
/*
* Implement the software portion of an FBIOPUTCMAP-like ioctl.
*/
int
bt_putcmap(p, cm, cmsize)
register struct fbcmap *p;
union bt_cmap *cm;
int cmsize;
{
register u_int i, start, count;
register u_char *cp;
start = p->index;
count = p->count;
if (start >= cmsize || count > cmsize - start)
return (EINVAL);
if (!useracc(p->red, count, B_READ) ||
!useracc(p->green, count, B_READ) ||
!useracc(p->blue, count, B_READ))
return (EFAULT);
for (cp = &cm->cm_map[start][0], i = 0; i < count; cp += 3, i++) {
cp[0] = p->red[i];
cp[1] = p->green[i];
cp[2] = p->blue[i];
}
return (0);
}
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