arch/x86/kernel/promif/prom_getchar.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include <sys/promif.h>
  30 #include <sys/promimpl.h>
  31 #include <sys/bootsvcs.h>
  32
  33 /*
  34  * prom_getchar
  35  *
  36  * always returns a character; waits for input if none is available.
  37  */
  38 uchar_t
  39 prom_getchar(void)
  40 {
  41         while (BSVC_ISCHAR(SYSP) == 0)
  42                 ;
  43         return (BSVC_GETCHAR(SYSP));
  44 }
  45
  46 /*
  47  * prom_mayget
  48  *
  49  * returns a character from the keyboard if one is available,
  50  * otherwise returns a -1.
  51  */
  52 int
  53 prom_mayget(void)
  54 {
  55         if (BSVC_ISCHAR(SYSP) == 0)
  56                 return (-1);
  57         return (BSVC_GETCHAR(SYSP));
  58 }