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multiboot.S revision 1.2.20.1 
      1 /*	$NetBSD: multiboot.S,v 1.2.20.1 2019/09/17 19:32:00 martin 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 (at) 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 (at) 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  */
     92 ENTRY(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