/*      $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