green_saver.c revision 6628 
1/*-
2 * Copyright (c) 1995 S�ren Schmidt
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer
10 *    in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 *    derived from this software withough specific prior written permission
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 *	$Id$
29 */
30
31#include <sys/param.h>
32#include <sys/systm.h>
33#include <sys/conf.h>
34#include <sys/exec.h>
35#include <sys/sysent.h>
36#include <sys/lkm.h>
37#include <sys/errno.h>
38#include <saver.h>
39
40MOD_MISC("green_saver")
41
42void (*current_saver)();
43void (*old_saver)();
44
45static void
46green_saver(int blank)
47{
48	u_char val;
49	if (blank) {
50		scrn_blanked = 1;
51		outb(TSIDX, 0x01); val = inb(TSREG);
52		outb(TSIDX, 0x01); outb(TSREG, val | 0x20);
53		outb(crtc_addr, 0x17); val = inb(crtc_addr + 1);
54		outb(crtc_addr + 1, val & ~0x80);
55	}
56	else {
57		outb(TSIDX, 0x01); val = inb(TSREG);
58		outb(TSIDX, 0x01); outb(TSREG, val & 0xDF);
59		outb(crtc_addr, 0x17); val = inb(crtc_addr + 1);
60		outb(crtc_addr + 1, val | 0x80);
61		scrn_blanked = 0;
62	}
63}
64
65saver_load(struct lkm_table *lkmtp, int cmd)
66{
67	(*current_saver)(0);
68	old_saver = current_saver;
69	current_saver = green_saver;
70	uprintf("green screen saver installed\n");
71	return 0;
72}
73
74saver_unload(struct lkm_table *lkmtp, int cmd)
75{
76	(*current_saver)(0);
77	current_saver = old_saver;
78	uprintf("green screen saver removed\n");
79	return 0;
80}
81
82saver_init(struct lkm_table *lkmtp, int cmd, int ver)
83{
84	DISPATCH(lkmtp, cmd, ver, saver_load, saver_unload, nosys);
85}
86