47 lines
1.9 KiB
ArmAsm
47 lines
1.9 KiB
ArmAsm
#
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# Copyright (c) 1999 Global Technology Associates, Inc.
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# All rights reserved.
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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 AUTHOR AND CONTRIBUTORS``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
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# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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# OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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# OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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# BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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# OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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# EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# From: sio.s 1.3 1999/01/10 14:48:03 rnordier
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# $FreeBSD$
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#
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.set SIO_PRT,SIOPRT # Base port
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.globl _(sio_putchr)
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# void sio_putchr(int c)
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_(sio_putchr): movw $SIO_PRT+0x5,%dx # Line status reg
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xor %ecx,%ecx # Timeout
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movb $0x40,%ch # counter
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sio_putchr.1: inb %dx,%al # Transmitter
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testb $0x20,%al # buffer empty?
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loopz sio_putchr.1 # No
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jz sio_putchr.2 # If timeout
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movb 0x4(%esp,1),%al # Get character
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subb $0x5,%dl # Transmitter hold reg
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outb %al,%dx # Write character
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sio_putchr.2: ret # To caller
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