multiboot.S revision 1.1.2.2
1 1.1.2.2 haad /* $NetBSD: multiboot.S,v 1.1.2.2 2008/10/19 22:15:50 haad Exp $ */ 2 1.1.2.2 haad 3 1.1.2.2 haad /* starts program in protected mode / flat space 4 1.1.2.2 haad with given stackframe 5 1.1.2.2 haad needs global variables flatcodeseg and flatdataseg 6 1.1.2.2 haad (gdt offsets) 7 1.1.2.2 haad derived from: NetBSD:sys/arch/i386/stand/lib/startprog.S 8 1.1.2.2 haad */ 9 1.1.2.2 haad 10 1.1.2.2 haad /*- 11 1.1.2.2 haad * Copyright (c) 2008 The NetBSD Foundation, Inc. 12 1.1.2.2 haad * All rights reserved. 13 1.1.2.2 haad * 14 1.1.2.2 haad * Redistribution and use in source and binary forms, with or without 15 1.1.2.2 haad * modification, are permitted provided that the following conditions 16 1.1.2.2 haad * are met: 17 1.1.2.2 haad * 1. Redistributions of source code must retain the above copyright 18 1.1.2.2 haad * notice, this list of conditions and the following disclaimer. 19 1.1.2.2 haad * 2. Redistributions in binary form must reproduce the above copyright 20 1.1.2.2 haad * notice, this list of conditions and the following disclaimer in the 21 1.1.2.2 haad * documentation and/or other materials provided with the distribution. 22 1.1.2.2 haad * 23 1.1.2.2 haad * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 24 1.1.2.2 haad * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 25 1.1.2.2 haad * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26 1.1.2.2 haad * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 27 1.1.2.2 haad * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 1.1.2.2 haad * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 1.1.2.2 haad * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 1.1.2.2 haad * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31 1.1.2.2 haad * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 1.1.2.2 haad * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 1.1.2.2 haad * POSSIBILITY OF SUCH DAMAGE. 34 1.1.2.2 haad */ 35 1.1.2.2 haad 36 1.1.2.2 haad /* 37 1.1.2.2 haad * Ported to boot 386BSD by Julian Elischer (julian (at) tfs.com) Sept 1992 38 1.1.2.2 haad * 39 1.1.2.2 haad * Mach Operating System 40 1.1.2.2 haad * Copyright (c) 1992, 1991 Carnegie Mellon University 41 1.1.2.2 haad * All Rights Reserved. 42 1.1.2.2 haad * 43 1.1.2.2 haad * Permission to use, copy, modify and distribute this software and its 44 1.1.2.2 haad * documentation is hereby granted, provided that both the copyright 45 1.1.2.2 haad * notice and this permission notice appear in all copies of the 46 1.1.2.2 haad * software, derivative works or modified versions, and any portions 47 1.1.2.2 haad * thereof, and that both notices appear in supporting documentation. 48 1.1.2.2 haad * 49 1.1.2.2 haad * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 50 1.1.2.2 haad * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 51 1.1.2.2 haad * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 52 1.1.2.2 haad * 53 1.1.2.2 haad * Carnegie Mellon requests users of this software to return to 54 1.1.2.2 haad * 55 1.1.2.2 haad * Software Distribution Coordinator or Software.Distribution (at) CS.CMU.EDU 56 1.1.2.2 haad * School of Computer Science 57 1.1.2.2 haad * Carnegie Mellon University 58 1.1.2.2 haad * Pittsburgh PA 15213-3890 59 1.1.2.2 haad * 60 1.1.2.2 haad * any improvements or extensions that they make and grant Carnegie Mellon 61 1.1.2.2 haad * the rights to redistribute these changes. 62 1.1.2.2 haad */ 63 1.1.2.2 haad 64 1.1.2.2 haad /* 65 1.1.2.2 haad Copyright 1988, 1989, 1990, 1991, 1992 66 1.1.2.2 haad by Intel Corporation, Santa Clara, California. 67 1.1.2.2 haad 68 1.1.2.2 haad All Rights Reserved 69 1.1.2.2 haad 70 1.1.2.2 haad Permission to use, copy, modify, and distribute this software and 71 1.1.2.2 haad its documentation for any purpose and without fee is hereby 72 1.1.2.2 haad granted, provided that the above copyright notice appears in all 73 1.1.2.2 haad copies and that both the copyright notice and this permission notice 74 1.1.2.2 haad appear in supporting documentation, and that the name of Intel 75 1.1.2.2 haad not be used in advertising or publicity pertaining to distribution 76 1.1.2.2 haad of the software without specific, written prior permission. 77 1.1.2.2 haad 78 1.1.2.2 haad INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE 79 1.1.2.2 haad INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, 80 1.1.2.2 haad IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR 81 1.1.2.2 haad CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 82 1.1.2.2 haad LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT, 83 1.1.2.2 haad NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION 84 1.1.2.2 haad WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 85 1.1.2.2 haad */ 86 1.1.2.2 haad 87 1.1.2.2 haad #include <machine/asm.h> 88 1.1.2.2 haad #define MULTIBOOT_INFO_MAGIC 0x2BADB002 89 1.1.2.2 haad 90 1.1.2.2 haad /* 91 1.1.2.2 haad * multiboot(phyaddr,header,stack) 92 1.1.2.2 haad * start the program on protected mode where phyaddr is the entry point 93 1.1.2.2 haad */ 94 1.1.2.2 haad ENTRY(multiboot) 95 1.1.2.2 haad pushl %ebp 96 1.1.2.2 haad movl %esp, %ebp 97 1.1.2.2 haad 98 1.1.2.2 haad # prepare a new stack 99 1.1.2.2 haad movl $flatdataseg, %eax 100 1.1.2.2 haad movw %ax, %es # for arg copy 101 1.1.2.2 haad movl 16(%ebp), %ebx # stack 102 1.1.2.2 haad subl $4,%ebx 103 1.1.2.2 haad movl %ebx, %edi 104 1.1.2.2 haad 105 1.1.2.2 haad movl 12(%ebp), %ebx # header 106 1.1.2.2 haad movl 8(%ebp), %ecx # entry 107 1.1.2.2 haad 108 1.1.2.2 haad # set new stackptr (movsl decd sp 1 more -> dummy return address) 109 1.1.2.2 haad movw %ax, %ss 110 1.1.2.2 haad movl %edi, %esp 111 1.1.2.2 haad 112 1.1.2.2 haad # push on our entry address 113 1.1.2.2 haad movl $flatcodeseg, %eax # segment 114 1.1.2.2 haad pushl %eax 115 1.1.2.2 haad pushl %ecx #entry 116 1.1.2.2 haad 117 1.1.2.2 haad # convert over the other data segs 118 1.1.2.2 haad movl $flatdataseg, %eax 119 1.1.2.2 haad mov %ax, %ds 120 1.1.2.2 haad mov %ax, %es 121 1.1.2.2 haad 122 1.1.2.2 haad movl $MULTIBOOT_INFO_MAGIC, %eax 123 1.1.2.2 haad # convert the PC (and code seg) 124 1.1.2.2 haad lret 125
Indexes created Sat Nov 01 19:09:55 GMT 2025