green_saver.c revision 6628 
1193326Sed/*-
2193326Sed * Copyright (c) 1995 S�ren Schmidt
3193326Sed * All rights reserved.
4193326Sed *
5193326Sed * Redistribution and use in source and binary forms, with or without
6193326Sed * modification, are permitted provided that the following conditions
7193326Sed * are met:
8193326Sed * 1. Redistributions of source code must retain the above copyright
9193326Sed *    notice, this list of conditions and the following disclaimer
10193326Sed *    in this position and unchanged.
11193326Sed * 2. Redistributions in binary form must reproduce the above copyright
12193326Sed *    notice, this list of conditions and the following disclaimer in the
13193326Sed *    documentation and/or other materials provided with the distribution.
14193326Sed * 3. The name of the author may not be used to endorse or promote products
15193326Sed *    derived from this software withough specific prior written permission
16193326Sed *
17193326Sed * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18193326Sed * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19193326Sed * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20193326Sed * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21193326Sed * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22193326Sed * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23193326Sed * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24193326Sed * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25193326Sed * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26193326Sed * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27193326Sed *
28193326Sed *	$Id$
29204962Srdivacky */
30193326Sed
31204962Srdivacky#include <sys/param.h>
32204962Srdivacky#include <sys/systm.h>
33193326Sed#include <sys/conf.h>
34193326Sed#include <sys/exec.h>
35193326Sed#include <sys/sysent.h>
36193326Sed#include <sys/lkm.h>
37193326Sed#include <sys/errno.h>
38193326Sed#include <saver.h>
39193326Sed
40198092SrdivackyMOD_MISC("green_saver")
41193326Sed
42224145Sdimvoid (*current_saver)();
43193326Sedvoid (*old_saver)();
44193326Sed
45193326Sedstatic void
46193326Sedgreen_saver(int blank)
47193326Sed{
48193326Sed	u_char val;
49193326Sed	if (blank) {
50193326Sed		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