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<!DOCTYPE html>
<html lang="en">
<head>
<!-- Basic Page Needs
================================================== -->
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>eXpOS Specification</title>
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<a class="navbar-brand" href="index.html">eXpOS<span>NITC</span></a>
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<li><a href="./index.html">Home</a></li>
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<!--=========== End HEADER SECTION ================-->
<!--heading of the page---->
<div class="container" style="margin-top: 80px;">
<br>
<br>
<h1 >eXpOS Specification</h1>
</div>
<!--=========== BEGIN Intro SECTION ================-->
<section id="about" style="text-align:justify">
<div class="container">
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<div class="col-lg-12 col-md-12">
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<!-- START ABOUT HEADING -->
<div class="heading">
<h2 >Who should read this document?</h2>
<br/>
<br/>
<p>This document must be read by anyone wishing to write eXpOS application programs in a high level language or assembly language. This OS specification is prepared in a manner independent of programming language and target machine. </p>
<p>The document is also informative for system programmers like compiler designers who wishes to write the application programmer's interface for a high level language like <a href="../support_tools-files/expl.html" target="_blank">ExpL</a> to be run on eXpOS. The application binary interface <a href="../abi.html" target="_blank">ABI</a> is the must-read document for the compiler designer.
</p>
<p>Finally, this document must be read by anyone who wants to implement eXpOS on some machine because one needs to know the specification for the OS before getting started with its implementation!
</p>
<h2 >Introduction</h2>
<br/>
<br/>
<p>This document gives application programmer's documentation for the eXperimental Operating System (eXpOS).
</p>
<p><b>eXpOS </b> is a tiny multiprogramming operating system. It has a very simple specification that allows a junior undergraduate computer science student to implement it in a few months, subject to availability of adequate hardware and programming platform support.
</p>
<p>This specification is prepared from the perspective of the user/application programmer and is not hardware specific. Assumptions about the underlying hardware features necessary for the operating system to work are discussed in the first section of this document.
</p>
<p>This document contains the following sections:</p>
</div>
</div>
</div>
</div>
</div>
</section>
<!--=========== END Intro SECTION ================-->
<!--=========== BEGIN contents SECTION ================-->
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<div class="container">
<div class="about_content">
<h4 class="panel-title"><a href="os_spec-files/overview.html" target="_blank"> <span class="fa fa-check-square-o"></span>1. Overview</a></h4>
<br>
<h4 class="panel-title"><a href="os_spec-files/expos_abstractions.html" target="_blank"> <span class="fa fa-check-square-o"></span>2. eXpOS Abstractions</a></h4>
<br>
<h4 class="panel-title"><a href="os_spec-files/eXpFS.html" target="_blank"> <span class="fa fa-check-square-o"></span>3. The Logical File System : eXpFS</a></h4>
<br>
<h4 class="panel-title"><a href="os_spec-files/processmodel.html" target="_blank"> <span class="fa fa-check-square-o"></span>4. Process Model</a></h4>
<br>
<h4 class="panel-title"><a href="os_spec-files/synchronization.html" target="_blank"> <span class="fa fa-check-square-o"></span>5. Synchronization and Access Control</a></h4>
<br>
<h4 class="panel-title"><a href="os_spec-files/misc.html" target="_blank"> <span class="fa fa-check-square-o"></span>6. Miscellaneous</a></h4>
<br>
<h4 class="panel-title"><a href="os_spec-files/multiuser.html" target="_blank"> <span class="fa fa-check-square-o"></span>7. Multi-user Extension to eXpOS</a></h4>
<br>
<div class="panel-group" id="accordion">
<div class="panel panel-default">
<div class="panel-heading">
<h4 class="panel-title">
<a data-toggle="collapse" href="#collapse1"><span class="fa fa-check-square-o"></span>8. Application Programmer's Interface (API)</a>
</h4>
</div>
<div id="collapse1" class="panel-collapse collapse">
<div class="panel-body">
<div class="panel-group" id="accordion">
<div class="panel panel-default">
<div class="panel-heading">
<h4 class="panel-title"><a href="os_spec-files/systemcallinterface.html" target="_blank"><span class="fa fa-check-square-o"></span>1. High Level System Call Interface</a></h4>
</div>
</div>
</div>
<div class="panel-group" id="accordion">
<div class="panel panel-default">
<div class="panel-heading">
<h4 class="panel-title"><a href="os_spec-files/dynamicmemoryroutines.html" target="_blank"><span class="fa fa-check-square-o"></span>2. High Level Library Interface</a></h4>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="panel-heading">
<h4 class="panel-title">
<a href="os_spec-files/shell_spec.html" target="_blank"><span class="fa fa-check-square-o"></span>9. eXpOS Shell specification</a>
</h4>
</div>
</div>
</div>
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<p><a href="http://www.nitc.ac.in/">National Institute of Technology, Calicut</a></p>
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