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82 lines
8.1 KiB
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<html><head><title>OSRC: The Boot Process </title></head>
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<body BGCOLOR=#FFFFFF TEXT=#000000 LINK=#0000FF VLINK=#0000FF ALINK=#107010>
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<center><font face=Verdana size=7><b>The Boot Process</b></font></center><blockquote>Boot sectors, bootable CD-ROMs, examples..</blockquote><table width="100%" cellpadding=0 cellspacing=0 border=0>
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<tr><td width="33%" align=left></td>
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<td width='33%' align=center></td>
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<td width='33%' align=right><font size=2>[<a href='..'>Up</a>]</font></td></tr>
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</table><hr><p><ul><DL>
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<DT><font size=+1>The Basics</font><br>
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<ul><DL>
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<DT><font size=+1><a href='http://www.nondot.org/sabre/os/files/Booting/CompilingBinaryFilesUsingACompiler.pdf'>"Making plain binary files using a C compiler"</a></font> - by <a href='mailto:Frank.Cornelis@rug.ac.be'>Cornelis Frank</a><br>
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<DD>This document is an excellent description of how to write OS code in C, and subsequently directly load it... very useful for a bootloader. It discusses C calling conventions and even variable argument lists!<p>
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<DT><font size=+1><a href='http://www.nondot.org/sabre/os/files/Booting/enableA20.s'>Enabling the A20 Address Line</a></font> - by J. Andrew McLaughlin<br>
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<DD>This snippet of NASM assembly code is used to enable the A20 addressing line so that more than 1M of memory can be addresed... very useful nowadays... :)<p>
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</DL></ul>
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<DT><font size=+1>Boot Sector Documentation</font><br>
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<ul><DL>
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<DT><font size=+1><a href='http://www.nondot.org/sabre/os/files/Booting/BootSector.html'>Boot Sector Overview</a></font> - by <a href='mailto:sabre@nondot.org'>Chris Lattner</a><br>
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<DD>Short tutorial I wrote that explains how a bootsector works and how it is supposed to interface to the startup code.<p>
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<DT><font size=+1><a href='http://www.nondot.org/sabre/os/files/Booting/x86Bootstrapping.html'>Guide to x86 Bootstrapping (and Partitioning)</a></font> - by <a href='mailto:vax@linkdead.paranoia.com'>VaX#n8</a><br>
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<DD>"This guide will attempt to describe partitioning, boot sequences, and the programs which manage them on the Intel 80x86 platform. Perhaps the simplest way to explain partitions and the bootup sequence is to start with simple cases, and add complexity as needed. We will start with a single-OS setup, and proceed to more complicated examples."<p>
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<DT><font size=+1><a href='http://www.nondot.org/sabre/os/files/Booting/nasmBoot.txt'>Daniels NASM bootstrap tutorial</a></font> - by <a href='mailto:daniel.marjamaki@home.se'>Daniel Marjam<61>ki</a><br>
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<DD>This tutorial builds off of the basics and gives concrete examples of how to use the NASM assembler to build a simple boot sector... more importantly however, it goes through the entire processes of compilation, copy, and reboot which is very helpful.<p>
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<DT><font size=+1><a href='http://www.nondot.org/sabre/os/files/Booting/mbr.txt'>Master Boot Record Tut</a></font> - by <a href='mailto:landis@sugs.tware.com'>Hale Landis</a><br>
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<DD>Part of the "How it works" series, which includes a disassembly of the MBR produced by the FDISK program.<p>
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</DL></ul>
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<DT><font size=+1>BIOS and CMOS Register Descriptions</font><br>
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<ul><DL>
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<DT><font size=+1><a href='http://www.nondot.org/sabre/os/files/Booting/BIOS_SEG.txt'>Format of BIOS Data Segment at segment 40h</a></font><br>
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<DD>This short file describes the format of the BIOS data segment that immediately follows the intterupt table in memory. This holds all kinds of neat stuff figured out by the BIOS, check it out!<p>
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<DT><font size=+1><a href='http://www.nondot.org/sabre/os/files/Booting/CMOS_SEG.txt'>Format of the CMOS Data Area</a></font> - by James Vahn<br>
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<DD>This is another short file, this one describes the CMOS data. This includes stuff like the RTC and various status registers.<p>
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</DL></ul>
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<DT><font size=+1>Industry Specifications</font><br>
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<ul><DL>
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<DT><font size=+1><a href='http://www.nondot.org/sabre/os/files/Booting/BIOSBootSpecsV1.01.pdf'>BIOS Boot Specification v1.01</a></font> - by Compaq, Phoenix and Intel<br>
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<DD>"The purpose of this specification is to describe a methodology by which the BIOS will identify all IPL (Initial Program Load) devices in the system, prioritize them in the order the user selects, and then sequentially go through each device and attempt to boot. The BIOS must become more intelligent about booting because the Plug and Play BIOS Specification places additional requirements on the BIOS during the boot process, and there are now more devices that are bootable such as CD-ROM, network remote boot, PCMCIA, etc."<p>
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<DT><font size=+1><a href='http://www.nondot.org/sabre/os/files/Booting/BootableCDFormat.doc'>"El Torito" Bootable CD-ROM Format</a></font><br>
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<DD>Ever wonder how to make a bootable CD-ROM? Here's the specs that define how to make it happen. OS install programs on bootable CD-ROM's are cool. We should have more of them.<p>
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</DL></ul>
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<DT><font size=+1>Examples of Boot Sectors...</font><br>
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<ul><DL>
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<DT><font size=+1>Established OS's...</font><br>
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<ul><DL>
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<DT><font size=+1><a href='http://www.nondot.org/sabre/os/files/Booting/LinuxBootSector.html'>The Linux 2.0 Boot Sector</a></font><br>
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<DD>This is a good example of some typical code from a real world source... the Linux boot sector. Here you can see how code evolvolution can affect source code as well...<p>
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<DT><font size=+1><a href='http://www.nondot.org/sabre/os/files/Booting/win95.asm'>Windows '95 Boot Sector</a></font> - by Mr. X<br>
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<DD>"Heroic attempt to disassemble the Windows 95 Boot Sector", how better can it be said? :)<p>
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</DL></ul>
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<DT><font size=+1><a href='http://www.nondot.org/sabre/os/files/Booting/MyBootSector.html'>My Experiences with the Boot Sector</a></font> - by <a href='mailto:sabre@nondot.org'>Chris Lattner</a><br>
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<DD>Here is some code from a real OS that I was working on. This includes utilities to write a boot sector to a floppy, and more!<p>
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<DT><font size=+1><a href='http://www.nondot.org/sabre/os/files/Booting/bootsec1.zip'>Boot Sector Example</a></font> - by <a href='mailto:mjvines@undergrad.math.uwaterloo.ca'>mjvines</a><br>
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<DD>"This is just a quick hack I put together to demonstate how to write bootsector code. All it does is print the initial values of the registers and then hang. I didn't really comment anything, but it's very simple so it shouldn't be difficult to understand."<p>
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<DT><font size=+1><a href='http://www.nondot.org/sabre/os/files/Booting/bootsec2.zip'>Boot Sector Example</a></font> - by Sean Tash<br>
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<DD>Another example bootsector that does some minimal file-system loading stuff...<p>
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<DT><font size=+1><a href='http://www.nondot.org/sabre/os/files/Booting/gbootsect.txt'>Boot Sector Example</a></font> - by Gareth Owen<br>
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<DD>Example text with some minimal explainations. This file includes a C routine to write the boot sector out to the floppy disk.<p>
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<DT><font size=+1><a href='http://www.nondot.org/sabre/os/files/Booting/PolyOS.html'>Boot Sector Example</a></font> - by Jeff Weeks<br>
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<DD>A brief explanation of the objective of a boot sector, followed by the source for an example bootsector. "Here's a bootsector from PolyOS that simply switches to protected mode, after checking that you have a 386+ computer. Actually, it even loads in the PolyFS superblock and checks if it's valid, but that's about it. Soon it'll load in the kernel and jump to it. The bootesctor was written with Nasm."<p>
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</DL></ul>
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</DL></ul>
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<hr>
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<TABLE ALIGN=RIGHT BORDER=0><TR><TD><center>
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Copyright © 1995-2002 <i><a href='mailto:sabre@nondot.org'>Chris Lattner</a></i><br>
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This page last modified:11/04/03<br><a href='..'>Go up a level</a><br>
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