79 lines
2.3 KiB
ArmAsm
79 lines
2.3 KiB
ArmAsm
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/* $NetBSD: biosdelay.S,v 1.4 2005/12/11 12:17:48 christos Exp $ */
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/*
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* Copyright (c) 1996, 1997
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* Perry E. Metzger. 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgements:
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* This product includes software developed for the NetBSD Project
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* by Perry E. Metzger.
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* 4. The names of the authors may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <machine/asm.h>
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.text
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/*
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* BIOS call "INT 15H Function 86H" to sleep for a set number of microseconds
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* Call with %ah = 0x86
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* %cx = time interval (high)
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* %dx = time interval (low)
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* Return:
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* If error
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* CF = set
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* else
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* CF = clear
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*/
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ENTRY(delay)
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pushl %ebp
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pushl %ebx
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pushl %esi
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pushl %edi
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movw 20(%esp), %dx
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movw 22(%esp), %cx
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call _C_LABEL(prot_to_real)
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.code16
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movb $0x86, %ah
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int $0x15
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setnc %ah
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movb %ah, %bl # real_to_prot uses %eax
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calll _C_LABEL(real_to_prot)
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.code32
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xorl %eax, %eax
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movb %bl, %al
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popl %edi
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popl %esi
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popl %ebx
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popl %ebp
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ret
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