biosgetsystime.S revision 1.1
1 1.1 dsl /* $NetBSD: biosgetsystime.S,v 1.1 2003/04/16 13:24:09 dsl Exp $ */ 2 1.1 dsl 3 1.1 dsl /*- 4 1.1 dsl * Copyright (c) 2003 The NetBSD Foundation, Inc. 5 1.1 dsl * All rights reserved. 6 1.1 dsl * 7 1.1 dsl * This code is derived from software contributed to The NetBSD Foundation 8 1.1 dsl * by David Laight. 9 1.1 dsl * 10 1.1 dsl * Redistribution and use in source and binary forms, with or without 11 1.1 dsl * modification, are permitted provided that the following conditions 12 1.1 dsl * are met: 13 1.1 dsl * 1. Redistributions of source code must retain the above copyright 14 1.1 dsl * notice, this list of conditions and the following disclaimer. 15 1.1 dsl * 2. Redistributions in binary form must reproduce the above copyright 16 1.1 dsl * notice, this list of conditions and the following disclaimer in the 17 1.1 dsl * documentation and/or other materials provided with the distribution. 18 1.1 dsl * 3. All advertising materials mentioning features or use of this software 19 1.1 dsl * must display the following acknowledgement: 20 1.1 dsl * This product includes software developed by the NetBSD 21 1.1 dsl * Foundation, Inc. and its contributors. 22 1.1 dsl * 4. Neither the name of The NetBSD Foundation nor the names of its 23 1.1 dsl * contributors may be used to endorse or promote products derived 24 1.1 dsl * from this software without specific prior written permission. 25 1.1 dsl * 26 1.1 dsl * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 1.1 dsl * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 1.1 dsl * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 1.1 dsl * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 1.1 dsl * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 1.1 dsl * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 1.1 dsl * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 1.1 dsl * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 1.1 dsl * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 1.1 dsl * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 1.1 dsl * POSSIBILITY OF SUCH DAMAGE. 37 1.1 dsl */ 38 1.1 dsl 39 1.1 dsl #include <machine/asm.h> 40 1.1 dsl 41 1.1 dsl /* Return system time (~18.2Hz ticks since midnight) */ 42 1.1 dsl 43 1.1 dsl ENTRY(biosgetsystime) 44 1.1 dsl pushl %ebp 45 1.1 dsl movl %esp, %ebp 46 1.1 dsl pushl %ebx 47 1.1 dsl pushl %ecx 48 1.1 dsl pushl %edx 49 1.1 dsl push %esi 50 1.1 dsl push %edi 51 1.1 dsl 52 1.1 dsl call _C_LABEL(prot_to_real) # enter real mode 53 1.1 dsl .code16 54 1.1 dsl 55 1.1 dsl movb $0, %ah 56 1.1 dsl int $0x1a 57 1.1 dsl 58 1.1 dsl calll _C_LABEL(real_to_prot) # back to protected mode 59 1.1 dsl .code32 60 1.1 dsl 61 1.1 dsl mov %ecx, %eax 62 1.1 dsl shl $16, %eax 63 1.1 dsl movw %dx, %ax 64 1.1 dsl 65 1.1 dsl pop %edi 66 1.1 dsl pop %esi 67 1.1 dsl popl %edx 68 1.1 dsl popl %ecx 69 1.1 dsl popl %ebx 70 1.1 dsl popl %ebp 71 1.1 dsl ret 72
Indexes created Wed Oct 01 15:09:59 GMT 2025