80 lines
2.4 KiB
ArmAsm
80 lines
2.4 KiB
ArmAsm
/* $NetBSD: message.S,v 1.4 2009/11/19 22:10:03 dsl Exp $ */
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/*-
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* Copyright (c) 2003 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by David Laight.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <machine/asm.h>
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.global message, message_1
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#if defined(BOOT_MSG_COM0) && !defined(COM_PORT_VAL)
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#define COM_PORT_VAL $0x3f8 /* Value for COM1 */
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#endif
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/*
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* message: write the error message in %ds:%esi to the console
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*/
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message:
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/*
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* BIOS call "INT 10H Function 0Eh" to write character to console
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* Call with %ah = 0x0e
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* %al = character
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* %bh = page
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* %bl = foreground color
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*/
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.code16
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pusha
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message_1: /* for dump_eax */
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lodsb
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1:
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#ifdef COM_PORT_VAL
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mov COM_PORT_VAL, %dx
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outb %al, %dx
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add $5, %dl
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2: inb %dx
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test $0x40, %al
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jz 2b
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#else
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movb $0x0e, %ah
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movw $0x0001, %bx
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int $0x10
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#endif
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lodsb
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testb %al, %al
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jnz 1b
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#ifdef MESSAGE_PAUSE
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/* Delay for about 1 second to allow message to be read */
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movb $0x86, %ah
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mov $16, %cx /* about a second */
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int $0x15 /* delay cx:dx usecs */
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#endif
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popa
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ret
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