1/*	$NetBSD: biosdelay.S,v 1.2.2.1 2005/11/10 13:56:54 skrll Exp $	*/
2
3/*
4 * Copyright (c) 1996, 1997
5 * 	Perry E. Metzger.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgements:
17 *	This product includes software developed for the NetBSD Project
18 *	by Perry E. Metzger.
19 * 4. The names of the authors may not be used to endorse or promote products
20 *    derived from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 *
33 */
34
35#include <machine/asm.h>
36
37	.text
38
39/*
40 * BIOS call "INT 15H Function 86H" to sleep for a set number of microseconds
41 *	Call with	%ah = 0x86
42 *			%cx = time interval (high)
43 *			%dx = time interval (low)
44 *	Return:
45 *		If error
46 *			CF  = set
47 *		else
48 *			CF  = clear
49 */
50ENTRY(delay)
51	pushl	%ebp
52	pushl	%ebx
53	pushl	%esi
54	pushl	%edi
55
56	movw	20(%esp), %dx
57	movw	22(%esp), %cx
58
59	call	_C_LABEL(prot_to_real)
60	.code16
61
62	movb	$0x86, %ah
63	int	$0x15
64	setnc	%ah
65
66	movb	%ah, %bl	# real_to_prot uses %eax
67
68	calll	_C_LABEL(real_to_prot)
69	.code32
70
71	xorl	%eax, %eax
72	movb	%bl, %al
73
74	popl	%edi
75	popl	%esi
76	popl	%ebx
77	popl	%ebp
78	ret
79