58 lines
1.7 KiB
ArmAsm
58 lines
1.7 KiB
ArmAsm
/* $NetBSD: biosgetrtc.S,v 1.7 2011/06/16 13:27:59 joerg Exp $ */
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/*
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* Copyright (c) 1996
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* Matthias Drochner. 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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*
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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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ENTRY(biosgetrtc)
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pusha
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pushl %eax
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xorl %ebx, %ebx
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call _C_LABEL(prot_to_real) # enter real mode
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.code16
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movb $2, %ah
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int $0x1a
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jnc ok
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movl $-1, %ebx
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ok:
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calll _C_LABEL(real_to_prot) # back to protected mode
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.code32
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popl %eax
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movb %ch, (%eax)
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movb %cl, 1(%eax)
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movb %dh, 2(%eax)
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movb $0, 3(%eax)
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movl %ebx, 28(%esp)
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popa
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ret
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