81acacd723
Support 32bit addresses >64k as valid on bios calls. Move stack for dosboot and biosboot to >64 so stack doesn't hit data. Use disk sector number passed by mbr code to select default partition (the mbr code doesn't do this yet). NB only biosboot and dosboot have been tested so far. (changes approved by christos and fvdl)
81 lines
2.3 KiB
ArmAsm
81 lines
2.3 KiB
ArmAsm
/* $NetBSD: biosdelay.S,v 1.2 2003/02/01 14:48:17 dsl 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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#define data32 .byte 0x66
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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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