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Diffstat (limited to 'sys/boot/i386/libi386/startprog.S')
-rw-r--r-- | sys/boot/i386/libi386/startprog.S | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/sys/boot/i386/libi386/startprog.S b/sys/boot/i386/libi386/startprog.S new file mode 100644 index 0000000..348341f --- /dev/null +++ b/sys/boot/i386/libi386/startprog.S @@ -0,0 +1,120 @@ +/* $NetBSD: startprog.S,v 1.1.1.1 1997/03/14 02:40:33 perry Exp $ */ + +/* starts program in protected mode / flat space + with given stackframe + needs global variables flatcodeseg and flatdataseg + (gdt offsets) + derivied from: NetBSD:sys/arch/i386/boot/asm.S + */ + +/* + * Ported to boot 386BSD by Julian Elischer (julian@tfs.com) Sept 1992 + * + * Mach Operating System + * Copyright (c) 1992, 1991 Carnegie Mellon University + * All Rights Reserved. + * + * Permission to use, copy, modify and distribute this software and its + * documentation is hereby granted, provided that both the copyright + * notice and this permission notice appear in all copies of the + * software, derivative works or modified versions, and any portions + * thereof, and that both notices appear in supporting documentation. + * + * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" + * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR + * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. + * + * Carnegie Mellon requests users of this software to return to + * + * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU + * School of Computer Science + * Carnegie Mellon University + * Pittsburgh PA 15213-3890 + * + * any improvements or extensions that they make and grant Carnegie Mellon + * the rights to redistribute these changes. + */ + +/* + Copyright 1988, 1989, 1990, 1991, 1992 + by Intel Corporation, Santa Clara, California. + + All Rights Reserved + +Permission to use, copy, modify, and distribute this software and +its documentation for any purpose and without fee is hereby +granted, provided that the above copyright notice appears in all +copies and that both the copyright notice and this permission notice +appear in supporting documentation, and that the name of Intel +not be used in advertising or publicity pertaining to distribution +of the software without specific, written prior permission. + +INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE +INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, +IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR +CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM +LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT, +NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION +WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. +*/ + +#include <machine/asm.h> + +/* + * startprog(phyaddr,argc,argv,stack) + * start the program on protected mode where phyaddr is the entry point + */ +ENTRY(startprog) + pushl %ebp + movl %esp, %ebp + + # prepare a new stack + movl $flatdataseg, %ebx + movw %bx, %es # for arg copy + movl 20(%ebp), %eax # stack + subl $4,%eax + movl %eax, %edi + + # push some number of args onto the stack + movl 12(%ebp), %ecx # argc + + movl %ecx, %eax + decl %eax + shl $2, %eax + addl 16(%ebp), %eax # ptr to last arg + movl %eax, %esi + + std # backwards + rep + movsl + + cld # LynxOS depends on it + + movl 8(%ebp), %ecx # entry + + # set new stackptr (movsl decd sp 1 more -> dummy return address) + movw %bx, %ss + movl %edi, %esp + + # plug in a return address so that FreeBSD detects we are using + # bootinfo + movl $ourreturn, %eax + movl %eax, (%esp) + + # push on our entry address + movl $flatcodeseg, %ebx # segment + pushl %ebx + pushl %ecx #entry + + # convert over the other data segs + movl $flatdataseg, %ebx + movl %bx, %ds + movl %bx, %es + + # convert the PC (and code seg) + lret + +ourreturn: + /* For now there is not much we can do, just lock in a loop */ + jmp ourreturn + |