78 lines
2.3 KiB
ArmAsm
78 lines
2.3 KiB
ArmAsm
/* $NetBSD: biosgetrtc.S,v 1.2 1997/06/13 13:42:27 drochner 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project
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* by Matthias Drochner.
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* 4. The name of the author 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 addr32 .byte 0x67
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#define data32 .byte 0x66
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ENTRY(biosgetrtc)
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pushl %ebp
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movl %esp, %ebp
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pushl %ebx
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pushl %ecx
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pushl %edx
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push %esi
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push %edi
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xorl %ebx, %ebx
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call _C_LABEL(prot_to_real) # enter real mode
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movb $2, %ah
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int $0x1a
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jnc ok
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data32
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movl $-1, %ebx
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ok:
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data32
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call _C_LABEL(real_to_prot) # back to protected mode
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movl 8(%ebp), %eax
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movl $0, (%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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movl %ebx, %eax
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pop %edi
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pop %esi
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popl %edx
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popl %ecx
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popl %ebx
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popl %ebp
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ret
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