multiboot.S revision 1.1.10.2
1 1.1.10.2 mjf /* $NetBSD: multiboot.S,v 1.1.10.2 2009/01/17 13:28:05 mjf Exp $ */ 2 1.1.10.2 mjf 3 1.1.10.2 mjf /* starts program in protected mode / flat space 4 1.1.10.2 mjf with given stackframe 5 1.1.10.2 mjf needs global variables flatcodeseg and flatdataseg 6 1.1.10.2 mjf (gdt offsets) 7 1.1.10.2 mjf derived from: NetBSD:sys/arch/i386/stand/lib/startprog.S 8 1.1.10.2 mjf */ 9 1.1.10.2 mjf 10 1.1.10.2 mjf /*- 11 1.1.10.2 mjf * Copyright (c) 2008 The NetBSD Foundation, Inc. 12 1.1.10.2 mjf * All rights reserved. 13 1.1.10.2 mjf * 14 1.1.10.2 mjf * Redistribution and use in source and binary forms, with or without 15 1.1.10.2 mjf * modification, are permitted provided that the following conditions 16 1.1.10.2 mjf * are met: 17 1.1.10.2 mjf * 1. Redistributions of source code must retain the above copyright 18 1.1.10.2 mjf * notice, this list of conditions and the following disclaimer. 19 1.1.10.2 mjf * 2. Redistributions in binary form must reproduce the above copyright 20 1.1.10.2 mjf * notice, this list of conditions and the following disclaimer in the 21 1.1.10.2 mjf * documentation and/or other materials provided with the distribution. 22 1.1.10.2 mjf * 23 1.1.10.2 mjf * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 24 1.1.10.2 mjf * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 25 1.1.10.2 mjf * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26 1.1.10.2 mjf * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 27 1.1.10.2 mjf * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 1.1.10.2 mjf * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 1.1.10.2 mjf * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 1.1.10.2 mjf * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31 1.1.10.2 mjf * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 1.1.10.2 mjf * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 1.1.10.2 mjf * POSSIBILITY OF SUCH DAMAGE. 34 1.1.10.2 mjf */ 35 1.1.10.2 mjf 36 1.1.10.2 mjf /* 37 1.1.10.2 mjf * Ported to boot 386BSD by Julian Elischer (julian (at) tfs.com) Sept 1992 38 1.1.10.2 mjf * 39 1.1.10.2 mjf * Mach Operating System 40 1.1.10.2 mjf * Copyright (c) 1992, 1991 Carnegie Mellon University 41 1.1.10.2 mjf * All Rights Reserved. 42 1.1.10.2 mjf * 43 1.1.10.2 mjf * Permission to use, copy, modify and distribute this software and its 44 1.1.10.2 mjf * documentation is hereby granted, provided that both the copyright 45 1.1.10.2 mjf * notice and this permission notice appear in all copies of the 46 1.1.10.2 mjf * software, derivative works or modified versions, and any portions 47 1.1.10.2 mjf * thereof, and that both notices appear in supporting documentation. 48 1.1.10.2 mjf * 49 1.1.10.2 mjf * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 50 1.1.10.2 mjf * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 51 1.1.10.2 mjf * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 52 1.1.10.2 mjf * 53 1.1.10.2 mjf * Carnegie Mellon requests users of this software to return to 54 1.1.10.2 mjf * 55 1.1.10.2 mjf * Software Distribution Coordinator or Software.Distribution (at) CS.CMU.EDU 56 1.1.10.2 mjf * School of Computer Science 57 1.1.10.2 mjf * Carnegie Mellon University 58 1.1.10.2 mjf * Pittsburgh PA 15213-3890 59 1.1.10.2 mjf * 60 1.1.10.2 mjf * any improvements or extensions that they make and grant Carnegie Mellon 61 1.1.10.2 mjf * the rights to redistribute these changes. 62 1.1.10.2 mjf */ 63 1.1.10.2 mjf 64 1.1.10.2 mjf /* 65 1.1.10.2 mjf Copyright 1988, 1989, 1990, 1991, 1992 66 1.1.10.2 mjf by Intel Corporation, Santa Clara, California. 67 1.1.10.2 mjf 68 1.1.10.2 mjf All Rights Reserved 69 1.1.10.2 mjf 70 1.1.10.2 mjf Permission to use, copy, modify, and distribute this software and 71 1.1.10.2 mjf its documentation for any purpose and without fee is hereby 72 1.1.10.2 mjf granted, provided that the above copyright notice appears in all 73 1.1.10.2 mjf copies and that both the copyright notice and this permission notice 74 1.1.10.2 mjf appear in supporting documentation, and that the name of Intel 75 1.1.10.2 mjf not be used in advertising or publicity pertaining to distribution 76 1.1.10.2 mjf of the software without specific, written prior permission. 77 1.1.10.2 mjf 78 1.1.10.2 mjf INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE 79 1.1.10.2 mjf INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, 80 1.1.10.2 mjf IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR 81 1.1.10.2 mjf CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 82 1.1.10.2 mjf LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT, 83 1.1.10.2 mjf NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION 84 1.1.10.2 mjf WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 85 1.1.10.2 mjf */ 86 1.1.10.2 mjf 87 1.1.10.2 mjf #include <machine/asm.h> 88 1.1.10.2 mjf #define MULTIBOOT_INFO_MAGIC 0x2BADB002 89 1.1.10.2 mjf 90 1.1.10.2 mjf /* 91 1.1.10.2 mjf * multiboot(phyaddr,header,stack) 92 1.1.10.2 mjf * start the program on protected mode where phyaddr is the entry point 93 1.1.10.2 mjf */ 94 1.1.10.2 mjf ENTRY(multiboot) 95 1.1.10.2 mjf pushl %ebp 96 1.1.10.2 mjf movl %esp, %ebp 97 1.1.10.2 mjf 98 1.1.10.2 mjf # prepare a new stack 99 1.1.10.2 mjf movl $flatdataseg, %eax 100 1.1.10.2 mjf movw %ax, %es # for arg copy 101 1.1.10.2 mjf movl 16(%ebp), %ebx # stack 102 1.1.10.2 mjf subl $4,%ebx 103 1.1.10.2 mjf movl %ebx, %edi 104 1.1.10.2 mjf 105 1.1.10.2 mjf movl 12(%ebp), %ebx # header 106 1.1.10.2 mjf movl 8(%ebp), %ecx # entry 107 1.1.10.2 mjf 108 1.1.10.2 mjf # set new stackptr (movsl decd sp 1 more -> dummy return address) 109 1.1.10.2 mjf movw %ax, %ss 110 1.1.10.2 mjf movl %edi, %esp 111 1.1.10.2 mjf 112 1.1.10.2 mjf # push on our entry address 113 1.1.10.2 mjf movl $flatcodeseg, %eax # segment 114 1.1.10.2 mjf pushl %eax 115 1.1.10.2 mjf pushl %ecx #entry 116 1.1.10.2 mjf 117 1.1.10.2 mjf # convert over the other data segs 118 1.1.10.2 mjf movl $flatdataseg, %eax 119 1.1.10.2 mjf mov %ax, %ds 120 1.1.10.2 mjf mov %ax, %es 121 1.1.10.2 mjf 122 1.1.10.2 mjf movl $MULTIBOOT_INFO_MAGIC, %eax 123 1.1.10.2 mjf # convert the PC (and code seg) 124 1.1.10.2 mjf lret 125
Indexes created Sat Nov 01 05:10:12 GMT 2025