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/* $NetBSD: biosdelay.S,v 1.1.1.1 1997/03/14 02:40:32 perry Exp $ */
/*
* Copyright (c) 1996, 1997
* Perry E. Metzger. All rights reserved.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgements:
* This product includes software developed for the NetBSD Project
* by Perry E. Metzger.
* 4. The names of the authors may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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.
*
*/
#include <machine/asm.h>
#define data32 .byte 0x66
.text
/*
# BIOS call "INT 15H Function 86H" to sleep for a set number of microseconds
# Call with %ah = 0x86
# %cx = time interval (high)
# %dx = time interval (low)
# Return:
# If error
# CF = set
# else
# CF = clear
*/
ENTRY(delay)
pushl %ebp
pushl %ebx
pushl %esi
pushl %edi
movw 20(%esp), %dx
movw 22(%esp), %cx
call CNAME(prot_to_real)
movb $0x86, %ah
int $0x15
setnc %ah
movb %ah, %bl # real_to_prot uses %eax
data32
call CNAME(real_to_prot)
xorl %eax, %eax
movb %bl, %al
popl %edi
popl %esi
popl %ebx
popl %ebp
ret
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