freebsd-dev/sys/dev/syscons/blank/blank_saver.c
Kazutaka YOKOTA 0de89efe5c Make the blank screen saver work with MDA and CGA. The fade and green
savers are also modified so that they behave in the same way as the
blank saver on MDA and CGA, although it's not the way these screen
savers are supposed to work, but fading monitor and tickling green
monitor cannot be done on MDA and CGA, AFAIK.  So, this is the second
best solution.

As of this change, the current state of support of screen savers is
summarized in the following table.

		MDA	CGA	EGA	VGA
blank		OK	OK	NA	OK
daemon		OK	OK	OK	OK
fade		*	*	NA	OK
green		*	*	NA	OK
snake		OK	OK	OK	OK
star		OK	OK	OK	OK

OK: works
NA: doesn't work, the module cannot be loaded for this adapter.
*: behave the same way as the blank saver.

As you can see, EGA is left out for now. But, we can do no better, as
EGA registers cannot be read...

Reviewed by: sos
1997-10-04 04:24:18 +00:00

120 lines
3.0 KiB
C

/*-
* Copyright (c) 1995 Søren Schmidt
* All rights reserved.
*
* 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
* in this position and unchanged.
* 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. The name of the author may not be used to endorse or promote products
* derived from this software withough specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
* $Id: blank_saver.c,v 1.10 1997/07/15 14:49:09 yokota Exp $
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/exec.h>
#include <sys/sysent.h>
#include <sys/lkm.h>
#include <i386/isa/isa.h>
#include <saver.h>
MOD_MISC(blank_saver);
static void
blank_saver(int blank)
{
u_char val;
if (blank) {
scrn_blanked = 1;
switch (crtc_type) {
case KD_VGA:
outb(TSIDX, 0x01); val = inb(TSREG);
outb(TSIDX, 0x01); outb(TSREG, val | 0x20);
break;
case KD_EGA:
/* not yet done XXX */
break;
case KD_CGA:
outb(crtc_addr + 4, 0x25);
break;
case KD_MONO:
case KD_HERCULES:
outb(crtc_addr + 4, 0x21);
break;
default:
break;
}
}
else {
switch (crtc_type) {
case KD_VGA:
outb(TSIDX, 0x01); val = inb(TSREG);
outb(TSIDX, 0x01); outb(TSREG, val & 0xDF);
break;
case KD_EGA:
/* not yet done XXX */
break;
case KD_CGA:
outb(crtc_addr + 4, 0x2d);
break;
case KD_MONO:
case KD_HERCULES:
outb(crtc_addr + 4, 0x29);
break;
default:
break;
}
scrn_blanked = 0;
}
}
static int
blank_saver_load(struct lkm_table *lkmtp, int cmd)
{
switch (crtc_type) {
case KD_MONO:
case KD_HERCULES:
case KD_CGA:
case KD_VGA:
break;
case KD_EGA:
/* EGA is yet to be supported */
default:
return ENODEV;
}
return add_scrn_saver(blank_saver);
}
static int
blank_saver_unload(struct lkm_table *lkmtp, int cmd)
{
return remove_scrn_saver(blank_saver);
}
int
blank_saver_mod(struct lkm_table *lkmtp, int cmd, int ver)
{
MOD_DISPATCH(blank_saver, lkmtp, cmd, ver,
blank_saver_load, blank_saver_unload, lkm_nullcmd);
}