arch/x86/kernel/promif/prom_putchar.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 /*ARGSUSED*/
  34 int
  35 prom_mayput(char c)
  36 {
  37         prom_putchar(c);
  38         return (1);
  39 }
  40
  41 void
  42 prom_putchar(char c)
  43 {
  44         static int bhcharpos = 0;
  45         promif_owrap_t *ow;
  46
  47         ow = promif_preout();
  48         switch (c) {
  49         case '\t':
  50                 do {
  51                         BSVC_PUTCHAR(SYSP, ' ');
  52                 } while (++bhcharpos % 8);
  53                 break;
  54         case '\n':
  55         case '\r':
  56                 bhcharpos = 0;
  57                 BSVC_PUTCHAR(SYSP, c);
  58                 break;
  59         case '\b':
  60                 if (bhcharpos)
  61                         bhcharpos--;
  62                 BSVC_PUTCHAR(SYSP, c);
  63                 break;
  64         default:
  65                 bhcharpos++;
  66                 BSVC_PUTCHAR(SYSP, c);
  67                 break;
  68         }
  69         promif_postout(ow);
  70 }
  71
  72 void
  73 prom_writestr(const char *s, size_t n)
  74 {
  75         while (n-- != 0)
  76                 prom_putchar(*s++);
  77 }