1/*	$NetBSD: message.S,v 1.3 2008/04/28 20:23:25 martin 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