Date: 13 Dec 1998 22:52:04 +0100 From: Dag-Erling Smorgrav <des@flood.ping.uio.no> To: hackers@FreeBSD.ORG Subject: Screensaver KLDs Message-ID: <xzpaf0r1zi3.fsf@flood.ping.uio.no>
next in thread | raw e-mail | index | archive | help
Well, I got itchy fingers again and tried to write a graphical
screensaver KLD. I used one of the existing screensaver modules as a
template; it compiles fine, and I'm pretty sure that the code is
mostly correct, but kldload refuses to load it:
root@niobe /sys/modules/syscons/vga# make
Warning: Object directory not changed from original /usr/src/sys/modules/syscons/vga
@ -> /usr/src/sys
machine -> /usr/src/sys/i386/include
cc -O -pipe -I/usr/src/sys/modules/syscons/vga/.. -DKERNEL -Wreturn-type -Wcomment -Wredundant-decls -Wimplicit -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Winline -Wuninitialized -Wformat -fformat-extensions -ansi -DKLD_MODULE -nostdinc -I- -I/usr/src/sys/modules/syscons/vga/.. -I/usr/src/sys/modules/syscons/vga -I/usr/src/sys/modules/syscons/vga/@ -c vga_saver.c
vga_saver.c:102: warning: initialization from incompatible pointer type
gensetdefs vga_saver.o
cc -O -pipe -I/usr/src/sys/modules/syscons/vga/.. -DKERNEL -Wreturn-type -Wcomment -Wredundant-decls -Wimplicit -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Winline -Wuninitialized -Wformat -fformat-extensions -ansi -DKLD_MODULE -nostdinc -I- -I/usr/src/sys/modules/syscons/vga/.. -I/usr/src/sys/modules/syscons/vga -I/usr/src/sys/modules/syscons/vga/@ -c setdef0.c
cc -O -pipe -I/usr/src/sys/modules/syscons/vga/.. -DKERNEL -Wreturn-type -Wcomment -Wredundant-decls -Wimplicit -Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Winline -Wuninitialized -Wformat -fformat-extensions -ansi -DKLD_MODULE -nostdinc -I- -I/usr/src/sys/modules/syscons/vga/.. -I/usr/src/sys/modules/syscons/vga -I/usr/src/sys/modules/syscons/vga/@ -c setdef1.c
ld -Bshareable -o vga_saver_mod.ko setdef0.o vga_saver.o setdef1.o
root@niobe /sys/modules/syscons/vga# kldload vga_saver
kldload: can't load vga_saver: Exec format error
The other screensaver KLDs work fine (and they all produce the same
warning when compiling). I'm running a bleeding-edge 3.0 Elf kernel.
Here's the source:
/*-
* Copyright (c) 1998 Dag-Erling Coïdan Smørgrav
* 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 without 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.
*
* $Id$
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <machine/md_var.h>
#include <saver.h>
static int saved_mode;
static u_char *vid;
static int counter;
static void
vga_saver(int blank)
{
scr_stat *scp = cur_console;
/* foo! */
if (!vid)
return;
if (blank) {
/* switch to graphics mode */
if (scrn_blanked <= 0) {
scp->status |= SAVER_RUNNING;
saved_mode = scp->mode;
if (sc_set_graphics_mode(scp, NULL, SW_VGA_CG320)) {
scp->status &= ~SAVER_RUNNING;
saved_mode = 0;
return;
}
fillw(1, vid, 320);
}
/* update display */
vid[counter++] = 1;
if (counter >= 320)
counter = 0;
vid[counter] = 15;
} else {
/* return to previous video mode */
if (scrn_blanked > 0) {
if (saved_mode)
sc_set_graphics_mode(scp, NULL, saved_mode);
scrn_blanked = 0;
scp->status &= ~SAVER_RUNNING;
saved_mode = 0;
}
}
}
static int
vga_saver_load(void)
{
video_info_t info;
/* check that the console is capable of running in 320x200x256 */
if ((*biosvidsw.get_info)(cur_console->adp, SW_VGA_CG320, &info))
return ENODEV;
vid = (u_char *)info.vi_window;
return add_scrn_saver(vga_saver);
}
static int
vga_saver_unload(void)
{
return remove_scrn_saver(vga_saver);
}
SAVER_MODULE(vga_saver);
DES
--
Dag-Erling Smorgrav - des@flood.ping.uio.no
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hackers" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?xzpaf0r1zi3.fsf>