Return to cninit.c CVS log

Up to [local] / sys / dev

Annotation of sys/dev/cninit.c, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: cninit.c,v 1.6 2003/06/02 23:28:01 millert Exp $      */
                      2: /*     $NetBSD: cninit.c,v 1.2 1995/04/11 22:08:10 pk Exp $    */
                      3:
                      4: /*
                      5:  * Copyright (c) 1988 University of Utah.
                      6:  * Copyright (c) 1990, 1993
                      7:  *     The Regents of the University of California.  All rights reserved.
                      8:  *
                      9:  * This code is derived from software contributed to Berkeley by
                     10:  * the Systems Programming Group of the University of Utah Computer
                     11:  * Science Department.
                     12:  *
                     13:  * Redistribution and use in source and binary forms, with or without
                     14:  * modification, are permitted provided that the following conditions
                     15:  * are met:
                     16:  * 1. Redistributions of source code must retain the above copyright
                     17:  *    notice, this list of conditions and the following disclaimer.
                     18:  * 2. Redistributions in binary form must reproduce the above copyright
                     19:  *    notice, this list of conditions and the following disclaimer in the
                     20:  *    documentation and/or other materials provided with the distribution.
                     21:  * 3. Neither the name of the University nor the names of its contributors
                     22:  *    may be used to endorse or promote products derived from this software
                     23:  *    without specific prior written permission.
                     24:  *
                     25:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     26:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     27:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     28:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     29:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     30:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     31:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     32:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     33:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     34:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     35:  * SUCH DAMAGE.
                     36:  *
                     37:  * from: Utah $Hdr: cons.c 1.7 92/01/21$
                     38:  *
                     39:  *     @(#)cons.c      8.2 (Berkeley) 1/12/94
                     40:  */
                     41:
                     42: #include <sys/param.h>
                     43: #include <sys/systm.h>
                     44: #include <sys/proc.h>
                     45: #include <sys/user.h>
                     46: #include <sys/buf.h>
                     47: #include <sys/ioctl.h>
                     48: #include <sys/tty.h>
                     49: #include <sys/file.h>
                     50: #include <sys/conf.h>
                     51: #include <sys/vnode.h>
                     52:
                     53: #include <dev/cons.h>
                     54:
                     55: void
                     56: cninit()
                     57: {
                     58:        struct consdev *cp;
                     59:
                     60:        /*
                     61:         * Collect information about all possible consoles
                     62:         * and find the one with highest priority
                     63:         */
                     64:        for (cp = constab; cp->cn_probe; cp++) {
                     65:                (*cp->cn_probe)(cp);
                     66:                if (cp->cn_pri > CN_DEAD &&
                     67:                    (cn_tab == NULL || cp->cn_pri > cn_tab->cn_pri))
                     68:                        cn_tab = cp;
                     69:        }
                     70:        /*
                     71:         * No console, we can handle it
                     72:         */
                     73:        if ((cp = cn_tab) == NULL)
                     74:                return;
                     75:        /*
                     76:         * Turn on console
                     77:         */
                     78:        (*cp->cn_init)(cp);
                     79: }
                     80:
                     81: int
                     82: cnset(dev)
                     83:        dev_t dev;
                     84: {
                     85:        struct consdev *cp;
                     86:
                     87:        /*
                     88:         * Look for the specified console device and use it.
                     89:         */
                     90:        for (cp = constab; cp->cn_probe; cp++) {
                     91:                if (major(cp->cn_dev) == major(dev)) {
                     92:                        /* short-circuit noop */
                     93:                        if (cp == cn_tab && cp->cn_dev == dev)
                     94:                                return (0);
                     95:                        if (cp->cn_pri > CN_DEAD) {
                     96:                                cn_tab = cp;
                     97:                                cp->cn_dev = dev;
                     98:                                /* Turn it on.  */
                     99:                                (cp->cn_init)(cp);
                    100:                                return (0);
                    101:                        }
                    102:                        break;
                    103:                }
                    104:        }
                    105:        return (1);
                    106: }