1/* $NetBSD: message32.S,v 1.1 2009/11/19 22:13:17 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/* 35 * Output messages directly to serial port from 32bit mode. 36 * Useful for debugging when the real-prot is suspect. 37 * 38 * %ds:dump_eax_buff must be somewhere it is safe to write 12 bytes. 39 */ 40 41#ifndef COM_PORT_VAL 42#define COM_PORT_VAL $0x3f8 /* Standard address COM1 (dty0) */ 43#endif 44 45 .globl message32 46 .code32 47message32: 48 pusha 49message32_1: 50 lodsb 512: 52 mov COM_PORT_VAL, %dx 53 outb %al, %dx 54 add $5, %dl 553: inb %dx 56 test $0x40, %al 57 jz 3b 58 59 lodsb 60 test %al, %al 61 jnz 2b 62 popa 63 ret 64 65 .globl dump_eax32 66dump_eax32: 67 pusha 68 movl $dump_eax_buff, %esi 69 mov %esi, %edi 70 push $8 71 pop %ecx 721: roll $4, %eax 73 push %eax 74 andb $0x0f, %al 75 addb $0x30, %al /* 30..3f - clear AF */ 76#if 1 /* 5 bytes to generate real hex... */ 77 daa /* 30..39, 40..45 */ 78 addb $0xc0, %al /* f0..f9, 00..05 */ 79 adcb $0x40, %al /* 30..39, 41..46 */ 80#endif 81 movb %al,(%edi) 82 inc %edi 83 pop %eax 84 loop 1b 85 push $0x20 /* space + 3 NULs */ 86 pop (%edi) 87 jmp message32_1 88