sio.s revision 48907
148907Srnordier# 248907Srnordier# Copyright (c) 1999 Global Technology Associates, Inc. 348907Srnordier# All rights reserved. 448907Srnordier# 548907Srnordier# Redistribution and use in source and binary forms, with or without 648907Srnordier# modification, are permitted provided that the following conditions 748907Srnordier# are met: 848907Srnordier# 1. Redistributions of source code must retain the above copyright 948907Srnordier# notice, this list of conditions and the following disclaimer. 1048907Srnordier# 2. Redistributions in binary form must reproduce the above copyright 1148907Srnordier# notice, this list of conditions and the following disclaimer in the 1248907Srnordier# documentation and/or other materials provided with the distribution. 1348907Srnordier# 1448907Srnordier# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS``AS IS'' AND 1548907Srnordier# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1648907Srnordier# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 1748907Srnordier# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS 1848907Srnordier# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 1948907Srnordier# OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 2048907Srnordier# OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 2148907Srnordier# BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 2248907Srnordier# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 2348907Srnordier# OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 2448907Srnordier# EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 2548907Srnordier# 2648907Srnordier# From: sio.s 1.3 1999/01/10 14:48:03 rnordier 2748907Srnordier# $Id:$ 2848907Srnordier# 2948907Srnordier 3048907Srnordier .set SIO_PRT,SIOPRT # Base port 3148907Srnordier 3248907Srnordier .globl sio_putchr 3348907Srnordier 3448907Srnordier# void sio_putchr(int c) 3548907Srnordier 3648907Srnordiersio_putchr: movw $SIO_PRT+0x5,%dx # Line status reg 3748907Srnordier xor %ecx,%ecx # Timeout 3848907Srnordier movb $0x40,%ch # counter 3948907Srnordiersio_putchr.1: inb (%dx),%al # Transmitter 4048907Srnordier testb $0x20,%al # buffer empty? 4148907Srnordier loopz sio_putchr.1 # No 4248907Srnordier jz sio_putchr.2 # If timeout 4348907Srnordier movb 0x4(%esp,1),%al # Get character 4448907Srnordier subb $0x5,%dl # Transmitter hold reg 4548907Srnordier outb %al,(%dx) # Write character 4648907Srnordiersio_putchr.2: ret # To caller 47