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Annotation of sys/dev/cninit.c, Revision 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: }