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# Copyright (c) KATO Takenori, 1999, 2000.
#
# All rights reserved. Unpublished rights reserved under the copyright
# laws of Japan.
#
# 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 as
# the first lines of this file unmodified.
# 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 AUTHOR ``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 AUTHOR 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.
#
# $FreeBSD$
#
.code16
.text
#
# Wait 1ms
#
.global wait1ms
wait1ms:
push %cx
movw $800, %cx
wait_loop:
outb %al, $0x5f
loop wait_loop
pop %cx
ret
#
# Read one byte from BIOS parameter block
# %bx offset
# %dl value
#
.global read_biosparam
read_biosparam:
movb %es:(%bx), %dl
ret
#
# Write one byte to BIOS paramter block
# %bx offset
# %dl value
#
.global write_biosparam
write_biosparam:
movb %dl, %es:(%bx)
ret
#
# beep
#
.global beep_on, beep_off, beep
beep_on:
movb $0x17, %ah
int $0x18
ret
beep_off:
movb $0x18, %ah
int $0x18
ret
beep:
push %cx
call beep_on
movw $100, %cx
beep_loop1:
call wait1ms
loop beep_loop1
call beep_off
movw $50, %cx
beep_loop2:
call wait1ms
loop beep_loop2
pop %cx
ret
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