biosgetsystime.S revision 1.3
1 1.3 joerg /* $NetBSD: biosgetsystime.S,v 1.3 2011/06/16 13:27:59 joerg 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 * 19 1.1 dsl * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.1 dsl * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.1 dsl * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.1 dsl * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.1 dsl * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.1 dsl * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.1 dsl * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.1 dsl * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.1 dsl * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.1 dsl * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.1 dsl * POSSIBILITY OF SUCH DAMAGE. 30 1.1 dsl */ 31 1.1 dsl 32 1.1 dsl #include <machine/asm.h> 33 1.1 dsl 34 1.1 dsl /* Return system time (~18.2Hz ticks since midnight) */ 35 1.1 dsl 36 1.1 dsl ENTRY(biosgetsystime) 37 1.3 joerg pusha 38 1.1 dsl 39 1.1 dsl call _C_LABEL(prot_to_real) # enter real mode 40 1.1 dsl .code16 41 1.1 dsl 42 1.1 dsl movb $0, %ah 43 1.1 dsl int $0x1a 44 1.1 dsl 45 1.1 dsl calll _C_LABEL(real_to_prot) # back to protected mode 46 1.1 dsl .code32 47 1.1 dsl 48 1.1 dsl mov %ecx, %eax 49 1.1 dsl shl $16, %eax 50 1.1 dsl movw %dx, %ax 51 1.3 joerg movl %eax, 28(%esp) 52 1.1 dsl 53 1.3 joerg popa 54 1.1 dsl ret 55
Indexes created Wed Oct 01 13:09:50 GMT 2025