1/*        $NetBSD: message.S,v 1.4 2009/11/19 22:10:03 dsl Exp $      */
2
3/*-
4 * Copyright (c) 2003 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by David Laight.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <machine/asm.h>
33
34          .global   message, message_1
35
36#if defined(BOOT_MSG_COM0) && !defined(COM_PORT_VAL)
37#define COM_PORT_VAL $0x3f8             /* Value for COM1 */
38#endif
39
40/*
41 * message: write the error message in %ds:%esi to the console
42 */
43message:
44/*
45 * BIOS call "INT 10H Function 0Eh" to write character to console
46 *        Call with %ah = 0x0e
47 *                            %al = character
48 *                            %bh = page
49 *                            %bl = foreground color
50 */
51          .code16
52          pusha
53message_1:                              /* for dump_eax */
54          lodsb
551:
56#ifdef COM_PORT_VAL
57          mov     COM_PORT_VAL, %dx
58          outb    %al, %dx
59          add     $5, %dl
602:        inb     %dx
61          test    $0x40, %al
62          jz      2b
63#else
64          movb      $0x0e, %ah
65          movw      $0x0001, %bx
66          int       $0x10
67#endif
68          lodsb
69          testb     %al, %al
70          jnz       1b
71
72#ifdef MESSAGE_PAUSE
73          /* Delay for about 1 second to allow message to be read */
74          movb      $0x86, %ah
75          mov       $16, %cx            /* about a second */
76          int       $0x15                         /* delay cx:dx usecs */
77#endif
78          popa
79          ret
80