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: }
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