nullconsole.c revision 66133
1/* 2 * nullconsole.c 3 * 4 * Copyright (c) 2000 Whistle Communications, Inc. 5 * All rights reserved. 6 * 7 * Subject to the following obligations and disclaimer of warranty, use and 8 * redistribution of this software, in source or object code forms, with or 9 * without modifications are expressly permitted by Whistle Communications; 10 * provided, however, that: 11 * 1. Any and all reproductions of the source or object code must include the 12 * copyright notice above and the following disclaimer of warranties; and 13 * 2. No rights are granted, in any manner or form, to use Whistle 14 * Communications, Inc. trademarks, including the mark "WHISTLE 15 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 16 * such appears in the above copyright notice or in the software. 17 * 18 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 19 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 20 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 21 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 22 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 23 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 24 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 25 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 26 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 27 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 28 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 29 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 30 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 33 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 34 * OF SUCH DAMAGE. 35 * 36 * Author: Doug Ambrisko <ambrisko@whistle.com> 37 * 38 * $FreeBSD: head/sys/boot/i386/libi386/nullconsole.c 66133 2000-09-20 18:13:36Z archie $ 39 */ 40 41#include <stand.h> 42#include <bootstrap.h> 43 44static void nullc_probe(struct console *cp); 45static int nullc_init(int arg); 46static void nullc_putchar(int c); 47static int nullc_getchar(void); 48static int nullc_ischar(void); 49 50struct console nullconsole = { 51 "nullconsole", 52 "null port", 53 0, 54 nullc_probe, 55 nullc_init, 56 nullc_putchar, 57 nullc_getchar, 58 nullc_ischar 59}; 60 61static void 62nullc_probe(struct console *cp) 63{ 64 cp->c_flags |= (C_PRESENTIN | C_PRESENTOUT); 65} 66 67static int 68nullc_init(int arg) 69{ 70 return(0); 71} 72 73static void 74nullc_putchar(int c) 75{ 76} 77 78static int 79nullc_getchar(void) 80{ 81 return(-1); 82} 83 84static int 85nullc_ischar(void) 86{ 87 return(0); 88} 89