usr/src/boot/sys/boot/i386/libi386/nullconsole.c

   1 /*-
   2  * nullconsole.c
   3  *
   4  * Author: Doug Ambrisko <ambrisko@whistle.com>
   5  * Copyright (c) 2000 Whistle Communications, Inc.
   6  * All rights reserved.
   7  *
   8  * Subject to the following obligations and disclaimer of warranty, use and
   9  * redistribution of this software, in source or object code forms, with or
  10  * without modifications are expressly permitted by Whistle Communications;
  11  * provided, however, that:
  12  * 1. Any and all reproductions of the source or object code must include the
  13  *    copyright notice above and the following disclaimer of warranties; and
  14  * 2. No rights are granted, in any manner or form, to use Whistle
  15  *    Communications, Inc. trademarks, including the mark "WHISTLE
  16  *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
  17  *    such appears in the above copyright notice or in the software.
  18  *
  19  * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
  20  * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
  21  * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
  22  * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
  23  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
  24  * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
  25  * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
  26  * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
  27  * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
  28  * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
  29  * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
  30  * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
  31  * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
  32  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  33  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  34  * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
  35  * OF SUCH DAMAGE.
  36  */
  37
  38 #include <sys/cdefs.h>
  39
  40 #include <stand.h>
  41 #include <bootstrap.h>
  42
  43 static void     nullc_probe(struct console *cp);
  44 static int      nullc_init(struct console *, int arg);
  45 static void     nullc_putchar(struct console *, int c);
  46 static int      nullc_getchar(struct console *);
  47 static int      nullc_ischar(struct console *);
  48
  49 struct console nullconsole = {
  50         "null",
  51         "null port",
  52         0,
  53         nullc_probe,
  54         nullc_init,
  55         nullc_putchar,
  56         nullc_getchar,
  57         nullc_ischar,
  58         NULL
  59 };
  60
  61 static void
  62 nullc_probe(struct console *cp)
  63 {
  64         cp->c_flags |= (C_PRESENTIN | C_PRESENTOUT);
  65 }
  66
  67 static int
  68 nullc_init(struct console *cp __attribute((unused)),
  69     int arg __attribute((unused)))
  70 {
  71         return(0);
  72 }
  73
  74 static void
  75 nullc_putchar(struct console *cp __attribute((unused)),
  76     int c __attribute((unused)))
  77 {
  78 }
  79
  80 static int
  81 nullc_getchar(struct console *cp __attribute((unused)))
  82 {
  83         return(-1);
  84 }
  85
  86 static int
  87 nullc_ischar(struct console *cp __attribute((unused)))
  88 {
  89         return(0);
  90 }