minix/sys/arch/i386/stand/lib/message32.S

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/* $NetBSD: message32.S,v 1.1 2009/11/19 22:13:17 dsl Exp $ */
/*-
* Copyright (c) 2003 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by David Laight.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <machine/asm.h>
/*
* Output messages directly to serial port from 32bit mode.
* Useful for debugging when the real-prot is suspect.
*
* %ds:dump_eax_buff must be somewhere it is safe to write 12 bytes.
*/
#ifndef COM_PORT_VAL
#define COM_PORT_VAL $0x3f8 /* Standard address COM1 (dty0) */
#endif
.globl message32
.code32
message32:
pusha
message32_1:
lodsb
2:
mov COM_PORT_VAL, %dx
outb %al, %dx
add $5, %dl
3: inb %dx
test $0x40, %al
jz 3b
lodsb
test %al, %al
jnz 2b
popa
ret
.globl dump_eax32
dump_eax32:
pusha
movl $dump_eax_buff, %esi
mov %esi, %edi
push $8
pop %ecx
1: roll $4, %eax
push %eax
andb $0x0f, %al
addb $0x30, %al /* 30..3f - clear AF */
#if 1 /* 5 bytes to generate real hex... */
daa /* 30..39, 40..45 */
addb $0xc0, %al /* f0..f9, 00..05 */
adcb $0x40, %al /* 30..39, 41..46 */
#endif
movb %al,(%edi)
inc %edi
pop %eax
loop 1b
push $0x20 /* space + 3 NULs */
pop (%edi)
jmp message32_1