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: blank_saver.c,v 1.4 1995/11/13 07:18:43 bde Exp $ 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 40 MOD_MISC(blank_saver); 41 42 void (*current_saver)(int blank); 43 void (*old_saver)(int blank); 44 45 static void 46 blank_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 } 54 else { 55 outb(TSIDX, 0x01); val = inb(TSREG); 56 outb(TSIDX, 0x01); outb(TSREG, val & 0xDF); 57 scrn_blanked = 0; 58 } 59 } 60 61 static int 62 blank_saver_load(struct lkm_table *lkmtp, int cmd) 63 { 64 (*current_saver)(0); 65 old_saver = current_saver; 66 current_saver = blank_saver; 67 uprintf("blank screen saver installed\n"); 68 return 0; 69 } 70 71 static int 72 blank_saver_unload(struct lkm_table *lkmtp, int cmd) 73 { 74 (*current_saver)(0); 75 current_saver = old_saver; 76 uprintf("blank screen saver removed\n"); 77 return 0; 78 } 79 80 int 81 blank_saver_mod(struct lkm_table *lkmtp, int cmd, int ver) 82 { 83 DISPATCH(lkmtp, cmd, ver, blank_saver_load, blank_saver_unload, 84 lkm_nullcmd); 85 } 86