1/* $NetBSD: multiboot.S,v 1.3 2019/09/13 02:19:46 manu Exp $ */ 2 3/* 4 * Copyright (c) 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29/* 30 * Ported to boot 386BSD by Julian Elischer (julian@tfs.com) Sept 1992 31 * 32 * Mach Operating System 33 * Copyright (c) 1992, 1991 Carnegie Mellon University 34 * All Rights Reserved. 35 * 36 * Permission to use, copy, modify and distribute this software and its 37 * documentation is hereby granted, provided that both the copyright 38 * notice and this permission notice appear in all copies of the 39 * software, derivative works or modified versions, and any portions 40 * thereof, and that both notices appear in supporting documentation. 41 * 42 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 43 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 44 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 45 * 46 * Carnegie Mellon requests users of this software to return to 47 * 48 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 49 * School of Computer Science 50 * Carnegie Mellon University 51 * Pittsburgh PA 15213-3890 52 * 53 * any improvements or extensions that they make and grant Carnegie Mellon 54 * the rights to redistribute these changes. 55 */ 56 57/* 58 * Copyright 1988, 1989, 1990, 1991, 1992 59 * by Intel Corporation, Santa Clara, California. 60 * 61 * All Rights Reserved 62 * 63 * Permission to use, copy, modify, and distribute this software and 64 * its documentation for any purpose and without fee is hereby 65 * granted, provided that the above copyright notice appears in all 66 * copies and that both the copyright notice and this permission notice 67 * appear in supporting documentation, and that the name of Intel 68 * not be used in advertising or publicity pertaining to distribution 69 * of the software without specific, written prior permission. 70 * 71 * INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE 72 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, 73 * IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR 74 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 75 * LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT, 76 * NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION 77 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 78 */ 79 80#include <machine/asm.h> 81 82/* 83 * Starts program in protected mode / flat space with given stackframe. 84 * Needs global variables flatcodeseg and flatdataseg (gdt offsets). 85 * Derived from: NetBSD:sys/arch/i386/stand/lib/startprog.S 86 */ 87 88/* 89 * multiboot(entry, header, stack, magic) 90 * start the program on protected mode, entry is phyaddr. 91 */ 92ENTRY(multiboot) 93 pushl %ebp 94 movl %esp,%ebp 95 96 /* Prepare a new stack */ 97 movl $flatdataseg,%eax 98 movw %ax,%es /* for arg copy */ 99 movl 16(%ebp),%ebx /* stack */ 100 subl $4,%ebx 101 movl %ebx,%edi 102 103 movl 20(%ebp),%edx /* magic */ 104 movl 12(%ebp),%ebx /* header */ 105 movl 8(%ebp),%ecx /* entry */ 106 107 /* Set new stack pointer */ 108 movw %ax,%ss 109 movl %edi,%esp 110 111 /* Push on our entry address */ 112 movl $flatcodeseg,%eax 113 pushl %eax /* code segment */ 114 pushl %ecx /* phyaddr */ 115 116 /* Convert over the other data segs */ 117 movl $flatdataseg,%eax 118 mov %ax,%ds 119 mov %ax,%es 120 121 movl %edx,%eax /* magic */ 122 123 /* Jump to phyaddr, with the new code segment */ 124 lret 125 126