green_saver.c revision 39428 
1/*-
2 * Copyright (c) 1995-1998 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 *    without modification, immediately at the beginning of the file.
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 without 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: green_saver.c,v 1.12 1998/09/15 18:16:39 sos Exp $
29 */
30
31#include <sys/param.h>
32#include <sys/systm.h>
33#include <sys/exec.h>
34#include <sys/sysent.h>
35#include <sys/lkm.h>
36
37#include <i386/isa/isa.h>
38
39#include <saver.h>
40
41MOD_MISC(green_saver);
42
43static void
44green_saver(int blank)
45{
46	u_char val;
47	if (blank) {
48		scrn_blanked = 1;
49		cur_console->status |= SAVER_RUNNING;
50		switch (crtc_type) {
51		case KD_VGA:
52			outb(TSIDX, 0x01); val = inb(TSREG);
53			outb(TSIDX, 0x01); outb(TSREG, val | 0x20);
54			outb(crtc_addr, 0x17); val = inb(crtc_addr + 1);
55			outb(crtc_addr + 1, val & ~0x80);
56			break;
57		case KD_EGA:
58			/* not yet done XXX */
59			break;
60		case KD_CGA:
61			outb(crtc_addr + 4, 0x25);
62			break;
63		case KD_MONO:
64		case KD_HERCULES:
65			outb(crtc_addr + 4, 0x21);
66			break;
67		default:
68			break;
69		}
70	}
71	else {
72		switch (crtc_type) {
73		case KD_VGA:
74			outb(TSIDX, 0x01); val = inb(TSREG);
75			outb(TSIDX, 0x01); outb(TSREG, val & 0xDF);
76			outb(crtc_addr, 0x17); val = inb(crtc_addr + 1);
77			outb(crtc_addr + 1, val | 0x80);
78			break;
79		case KD_EGA:
80			/* not yet done XXX */
81			break;
82		case KD_CGA:
83			outb(crtc_addr + 4, 0x2d);
84			break;
85		case KD_MONO:
86		case KD_HERCULES:
87			outb(crtc_addr + 4, 0x29);
88			break;
89		default:
90			break;
91		}
92		cur_console->status &= ~SAVER_RUNNING;
93		scrn_blanked = 0;
94	}
95}
96
97static int
98green_saver_load(struct lkm_table *lkmtp, int cmd)
99{
100	switch (crtc_type) {
101	case KD_MONO:
102	case KD_HERCULES:
103	case KD_CGA:
104		/*
105		 * `green' saver is not fully implemented for MDA and CGA.
106		 * It simply blanks the display instead.
107		 */
108	case KD_VGA:
109		break;
110	case KD_EGA:
111		/* EGA is yet to be supported */
112	default:
113		return ENODEV;
114	}
115	return add_scrn_saver(green_saver);
116}
117
118static int
119green_saver_unload(struct lkm_table *lkmtp, int cmd)
120{
121	return remove_scrn_saver(green_saver);
122}
123
124int
125green_saver_mod(struct lkm_table *lkmtp, int cmd, int ver)
126{
127	MOD_DISPATCH(green_saver, lkmtp, cmd, ver,
128		green_saver_load, green_saver_unload, lkm_nullcmd);
129}
130