00001 /***************************************************************************************** 00002 Copyright (c) 2002-2004 The UbixOS Project 00003 All rights reserved. 00004 00005 Redistribution and use in source and binary forms, with or without modification, are 00006 permitted provided that the following conditions are met: 00007 00008 Redistributions of source code must retain the above copyright notice, this list of 00009 conditions, the following disclaimer and the list of authors. Redistributions in binary 00010 form must reproduce the above copyright notice, this list of conditions, the following 00011 disclaimer and the list of authors in the documentation and/or other materials provided 00012 with the distribution. Neither the name of the UbixOS Project nor the names of its 00013 contributors may be used to endorse or promote products derived from this software 00014 without specific prior written permission. 00015 00016 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY 00017 EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 00018 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 00019 THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 00020 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 00021 OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 00022 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR 00023 TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 00024 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00025 00026 $Id: start_8S-source.html 88 2016-01-12 00:11:29Z reddawg $ 00027 00028 *****************************************************************************************/ 00029 00030 .globl _start 00031 .text 00032 .code32 00033 _start: 00034 movw $0x1234,0x472 00035 pushl %ebp 00036 movl %esp,%ebp 00037 pushl $0x00000002 00038 popfl 00039 /* Clear the BSS */ 00040 movl $(_end),%ecx 00041 movl $(__bss_start),%edi 00042 subl %edi,%ecx 00043 xorl %eax,%eax 00044 cld 00045 rep 00046 stosb 00047 00048 /* Load GDT */ 00049 lgdtl (loadGDT) 00050 mov $0x10,%eax 00051 mov %eax,%ds 00052 mov %eax,%es 00053 mov %eax,%fs 00054 mov %eax,%gs 00055 mov %eax,%ss 00056 mov $kStack,%eax 00057 addl $0x2000,%eax 00058 mov %esp,%edx 00059 mov %eax,%esp 00060 mov %eax,%ebp 00061 mov $0x18,%ax 00062 lldt %ax 00063 mov $0x20,%ax 00064 ltr %ax 00065 ljmp $0x08,$start_next 00066 start_next: 00067 push 8(%edx) 00068 call kmain 00069 00070 .data 00071 .comm kStack,0x2000 00072 00073 /*** 00074 END 00075 ***/
1.4.7