/* $NetBSD: biosgetrtc.S,v 1.1.1.1 1997/03/14 02:40:32 perry Exp $ */ /* * Copyright (c) 1996 * Matthias Drochner. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed for the NetBSD Project * by Matthias Drochner. * 4. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ #include #define addr32 .byte 0x67 #define data32 .byte 0x66 ENTRY(biosgetrtc) pushl %ebp movl %esp, %ebp pushl %ebx pushl %ecx pushl %edx push %esi push %edi xorl %ebx, %ebx call _C_LABEL(prot_to_real) # enter real mode movb $2, %ah int $0x1a jnc ok movl $-1, %ebx ok: data32 call _C_LABEL(real_to_prot) # back to protected mode movl 8(%ebp), %eax movl $0, (%eax) movb %ch, (%eax) movb %cl, 1(%eax) movb %dh, 2(%eax) movl %ebx, %eax pop %edi pop %esi popl %edx popl %ecx popl %ebx popl %ebp ret