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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 Design</title>
<!-- Mobile Specific Metas
================================================== -->
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- Favicon -->
<link rel="shortcut icon" type="image/png" href="img/favicon.jpg" />
<!-- CSS
================================================== -->
<!-- Bootstrap css file-->
<link href="css/bootstrap.min.css" rel="stylesheet">
<!-- Font awesome css file-->
<link href="css/font-awesome.min.css" rel="stylesheet">
<!-- Superslide css file-->
<link rel="stylesheet" href="css/superslides.css">
<!-- Slick slider css file -->
<link href="css/slick.css" rel="stylesheet">
<!-- smooth animate css file -->
<link rel="stylesheet" href="css/animate.css">
<!-- Elastic grid css file -->
<link rel="stylesheet" href="css/elastic_grid.css">
<!-- Circle counter cdn css file -->
<link rel='stylesheet prefetch' href='css/jquery.circliful.css'>
<!-- Default Theme css file -->
<link id="orginal" href="css/themes/eucalyptus-theme.css" rel="stylesheet">
<!-- Main structure css file -->
<link href="style.css" rel="stylesheet">
<!-- Google fonts -->
<link href='http://fonts.googleapis.com/css?family=Open+Sans' rel='stylesheet' type='text/css'>
<link href='http://fonts.googleapis.com/css?family=Varela' rel='stylesheet' type='text/css'>
<link href='http://fonts.googleapis.com/css?family=Montserrat' rel='stylesheet' type='text/css'>
</head>
<body>
<!-- BEGAIN PRELOADER -->
<!-- END PRELOADER -->
<!--=========== BEGIN HEADER SECTION ================-->
<header id="header">
<!-- BEGIN MENU -->
<div class="menu_area">
<nav class="navbar navbar-default navbar-fixed-top past-main" role="navigation">
<div class="container">
<div class="navbar-header">
<!-- FOR MOBILE VIEW COLLAPSED BUTTON -->
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar"
aria-expanded="false" aria-controls="navbar">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<!-- LOGO -->
<!-- TEXT BASED LOGO -->
<a class="navbar-brand" href="index.html">eXpOS<span>NITC</span></a>
</div>
<div id="navbar" class="navbar-collapse collapse">
<ul id="top-menu" class="nav navbar-nav navbar-right main_nav">
<li><a href="./index.html">Home</a></li>
<li><a href="./documentation.html" target="_blank">Documentation</a></li>
<li><a href="./Roadmap.html" target="_blank">Roadmap</a></li>
<li><a href="faq.html" target="_blank">FAQ</a></li>
<li><a href="About_us.html" target="_blank">About Us</a></li>
</ul>
</div>
</div>
</nav>
</div>
<!-- END MENU -->
</header>
<!--=========== End HEADER SECTION ================-->
<!--heading of the page---->
<div class="container" style="margin-top: 80px;">
<br>
<br>
<h1>eXpOS Design</h1>
</div>
<!--=========== BEGIN SECTION================-->
<section id="design" style="text-align:justify">
<div class="container">
<div class="row">
<div class="col-lg-12 col-md-12">
<div class="about_area">
<!-- START HEADING -->
<div class="heading">
<h2>Introduction</h2>
<br />
<br />
<p>This document specifies the high level system design on eXpOS along with the specification of Data
Structures and Algorithms used in eXpOS.
</p>
<p>Data Structures can be classified into - Memory Data Structures (In-core) and Disk Data Structures. The
Disk Data Structures are loaded to memory by the OS startup code and stored back when system terminates.
</p>
<p>Algorithms specified in this document can fall into any of the five categories - File System Calls,
Process System Calls, System Calls related to access control and synchronization, Multiuser System Calls
and Hardware Interrupts and Exception Handler.
</p>
<!-- START SINGLE FEATURED ITEM #1 -->
<div class="panel panel-default " id="design">
<br>
<br>
<h4 class="panel-title" style="padding-top: 20px">High Level Design</h4>
<div class="panel-body">
<br>
<div style="background: url(img/os-design/os_design_detailed.png); height: 819px; width: 1206px" ;>
<a target="_blank" href="os_design-files/misc.html#swapper"
style="position: absolute; height: 62px; width: 120px; margin-top: 10px; margin-left: 260px"></a>
<a target="_blank" href="os_spec-files/shell_spec.html"
style="position: absolute; height: 62px; width: 100px; margin-top: 10px; margin-left: 410px"></a>
<a target="_blank" href="os_spec-files/shell_spec.html"
style="position: absolute; height: 62px; width: 100px; margin-top: 10px; margin-left: 540px"></a>
<a target="_blank" href="os_design-files/misc.html#idle"
style="position: absolute; height: 62px; width: 120px; margin-top: 90px; margin-left: 20px"></a>
<a target="_blank" href="os_design-files/misc.html#login"
style="position: absolute; height: 62px; width: 200px; margin-top: 90px; margin-left: 180px"></a>
<a target="_blank" href="os_design-files/misc.html#shell"
style="position: absolute; height: 62px; width: 220px; margin-top: 90px; margin-left: 420px"></a>
<a href="#syscallsdiag"
style="position: absolute; height: 60px; width: 130px; margin-top: 230px; margin-left: 35px"></a>
<a href="#syscallsdiag"
style="position: absolute; height: 60px; width: 120px; margin-top: 230px; margin-left: 165px"></a>
<a href="#syscallsdiag"
style="position: absolute; height: 60px; width: 120px; margin-top: 230px; margin-left: 285px"></a>
<a href="#syscallsdiag"
style="position: absolute; height: 60px; width: 120px; margin-top: 230px; margin-left: 405px"></a>
<a href="#syscallsdiag"
style="position: absolute; height: 60px; width: 120px; margin-top: 230px; margin-left: 525px"></a>
<a target="_blank" href="os_design-files/exe_handler.html"
style="position: absolute; height: 60px; width: 80px; margin-top: 230px; margin-left: 750px"></a>
<a target="_blank" href="os_design-files/timer.html"
style="position: absolute; height: 60px; width: 80px; margin-top: 230px; margin-left: 830px"></a>
<a target="_blank" href="os_design-files/disk_interrupt.html"
style="position: absolute; height: 60px; width: 80px; margin-top: 230px; margin-left: 910px"></a>
<a target="_blank" href="os_design-files/term_handler.html"
style="position: absolute; height: 60px; width: 80px; margin-top: 230px; margin-left: 990px"></a>
<a target="_blank" href="os_modules/Module_3.html"
style="position: absolute; height: 60px; width: 200px; margin-top: 378px; margin-left: 140px"></a>
<a target="_blank" href="os_modules/Module_1.html"
style="position: absolute; height: 60px; width: 200px; margin-top: 378px; margin-left: 380px"></a>
<a target="_blank" href="os_modules/Module_2.html"
style="position: absolute; height: 60px; width: 200px; margin-top: 378px; margin-left: 620px"></a>
<a target="_blank" href="os_modules/Module_6.html"
style="position: absolute; height: 60px; width: 200px; margin-top: 378px; margin-left: 860px"></a>
<a target="_blank" href="os_modules/Module_4.html"
style="position: absolute; height: 60px; width: 440px; margin-top: 470px; margin-left: 140px"></a>
<a target="_blank" href="os_modules/Module_5.html"
style="position: absolute; height: 60px; width: 440px; margin-top: 470px; margin-left: 620px"></a>
<a target="_blank" href="os_modules/Module_0.html"
style="position: absolute; height: 68px; width: 760px; margin-top: 580px; margin-left: 100px"></a>
<a target="_blank" href="os_modules/Module_0.html"
style="position: absolute; height: 260px; width: 60px; margin-top: 380px; margin-left: 40px"></a>
<a target="_blank" href="os_modules/Module_7.html"
style="position: absolute; height: 68px; width: 170px; margin-top: 580px; margin-left: 890px"></a>
<a target="_blank" href="arch_spec-files/machine_organisation.html#Boot ROM"
style="position: absolute; height: 68px; width: 120px; margin-top: 730px; margin-left: 790px"></a>
<a target="_blank" href="os_design-files/misc.html#os_startup"
style="position: absolute; height: 68px; width: 120px; margin-top: 730px; margin-left: 950px"></a>
</div>
<br>
<!--end memory data structures-->
<h4 class="panel-title" style="padding-top: 20px" id="syscallsdiag">System Calls</h4>
<br>
<div style="background: url(img/os-design/SystemCalls.png); height: 442px; width: 1032px" ;>
<a target="_blank" href="os_design-files/shutdown.html"
style="position: absolute; height: 60px; width: 190px; margin-top: 52px; margin-left: 20px"></a>
<a target="_blank" href="os_design-files/create.html"
style="position: absolute; height: 30px; width: 150px; margin-top: 110px; margin-left: 240px"></a>
<a target="_blank" href="os_design-files/delete.html"
style="position: absolute; height: 33px; width: 150px; margin-top: 150px; margin-left: 240px"></a>
<a target="_blank" href="os_design-files/open.html"
style="position: absolute; height: 30px; width: 150px; margin-top: 190px; margin-left: 240px"></a>
<a target="_blank" href="os_design-files/close.html"
style="position: absolute; height: 30px; width: 150px; margin-top: 230px; margin-left: 240px"></a>
<a target="_blank" href="os_design-files/read.html"
style="position: absolute; height: 30px; width: 150px; margin-top: 270px; margin-left: 240px"></a>
<a target="_blank" href="os_design-files/write.html"
style="position: absolute; height: 30px; width: 150px; margin-top: 312px; margin-left: 240px"></a>
<a target="_blank" href="os_design-files/seek.html"
style="position: absolute; height: 30px; width: 150px; margin-top: 350px; margin-left: 240px"></a>
<a target="_blank" href="os_design-files/fork.html"
style="position: absolute; height: 30px; width: 150px; margin-top: 113px; margin-left: 440px"></a>
<a target="_blank" href="os_design-files/exec.html"
style="position: absolute; height: 33px; width: 150px; margin-top: 150px; margin-left: 440px"></a>
<a target="_blank" href="os_design-files/exit.html"
style="position: absolute; height: 30px; width: 150px; margin-top: 190px; margin-left: 440px"></a>
<a target="_blank" href="os_design-files/proc_misc.html#getpid"
style="position: absolute; height: 30px; width: 150px; margin-top: 230px; margin-left: 440px"></a>
<a target="_blank" href="os_design-files/proc_misc.html#getppid"
style="position: absolute; height: 30px; width: 150px; margin-top: 270px; margin-left: 440px"></a>
<a target="_blank" href="os_design-files/synchronization_algos.html#wait"
style="position: absolute; height: 30px; width: 150px; margin-top: 113px; margin-left: 640px"></a>
<a target="_blank" href="os_design-files/synchronization_algos.html#signal"
style="position: absolute; height: 33px; width: 150px; margin-top: 150px; margin-left: 640px"></a>
<a target="_blank" href="os_design-files/semaphore_algos.html#semget"
style="position: absolute; height: 30px; width: 150px; margin-top: 190px; margin-left: 640px"></a>
<a target="_blank" href="os_design-files/semaphore_algos.html#semrelease"
style="position: absolute; height: 30px; width: 150px; margin-top: 230px; margin-left: 640px"></a>
<a target="_blank" href="os_design-files/semaphore_algos.html#semlock"
style="position: absolute; height: 30px; width: 150px; margin-top: 270px; margin-left: 640px"></a>
<a target="_blank" href="os_design-files/semaphore_algos.html#semunlock"
style="position: absolute; height: 30px; width: 150px; margin-top: 315px; margin-left: 640px"></a>
<a target="_blank" href="os_design-files/multiusersyscalls.html#newusr"
style="position: absolute; height: 30px; width: 150px; margin-top: 113px; margin-left: 840px"></a>
<a target="_blank" href="os_design-files/multiusersyscalls.html#remusr"
style="position: absolute; height: 33px; width: 150px; margin-top: 150px; margin-left: 840px"></a>
<a target="_blank" href="os_design-files/multiusersyscalls.html#setpwd"
style="position: absolute; height: 30px; width: 150px; margin-top: 190px; margin-left: 840px"></a>
<a target="_blank" href="os_design-files/multiusersyscalls.html#getuid"
style="position: absolute; height: 30px; width: 150px; margin-top: 230px; margin-left: 840px"></a>
<a target="_blank" href="os_design-files/multiusersyscalls.html#getuname"
style="position: absolute; height: 30px; width: 150px; margin-top: 270px; margin-left: 840px"></a>
<a target="_blank" href="os_design-files/multiusersyscalls.html#login"
style="position: absolute; height: 30px; width: 150px; margin-top: 312px; margin-left: 840px"></a>
<a target="_blank" href="os_design-files/multiusersyscalls.html#logout"
style="position: absolute; height: 30px; width: 150px; margin-top: 350px; margin-left: 840px"></a>
</div>
</div>
</div>
<!--end file system calls-->
<h4 class="panel-title" style="padding-top: 20px">Data Structures</h4>
<br>
<div
style="background: url(img/os-design/DataStructures_new.png); height: 671px; width: 671px; margin-bottom:30px"
;>
<a target="_blank" href="os_design-files/disk_ds.html#inode_table"
style="position: absolute; height: 30px; width: 150px; margin-top: 83px; margin-left: 50px"></a>
<a target="_blank" href="os_design-files/disk_ds.html#disk_free_list"
style="position: absolute; height: 30px; width: 150px; margin-top: 123px; margin-left: 50px"></a>
<a target="_blank" href="os_design-files/disk_ds.html#root_file"
style="position: absolute; height: 32px; width: 150px; margin-top: 168px; margin-left: 50px"></a>
<a target="_blank" href="os_design-files/disk_ds.html#user_table"
style="position: absolute; height: 32px; width: 150px; margin-top: 208px; margin-left: 50px"></a>
<a target="_blank" href="os_design-files/process_table.html"
style="position: absolute; height: 32px; width: 290px; margin-top: 113px; margin-left: 310px"></a>
<a target="_blank" href="os_design-files/process_table.html#user_area"
style="position: absolute; height: 32px; width: 290px; margin-top: 233px; margin-left: 310px"></a>
<a target="_blank" href="os_design-files/mem_ds.html#file_table"
style="position: absolute; height: 32px; width: 290px; margin-top: 325px; margin-left: 310px"></a>
<a target="_blank" href="os_design-files/mem_ds.html#file_lock_status_table"
style="position: absolute; height: 32px; width: 290px; margin-top: 365px; margin-left: 310px"></a>
<a target="_blank" href="os_design-files/mem_ds.html#sem_table"
style="position: absolute; height: 32px; width: 290px; margin-top: 405px; margin-left: 310px"></a>
<a target="_blank" href="os_design-files/mem_ds.html#ds_table"
style="position: absolute; height: 32px; width: 290px; margin-top: 445px; margin-left: 310px"></a>
<a target="_blank" href="os_design-files/mem_ds.html#ss_table"
style="position: absolute; height: 30px; width: 290px; margin-top: 485px; margin-left: 310px"></a>
<a target="_blank" href="os_design-files/mem_ds.html#ts_table"
style="position: absolute; height: 30px; width: 290px; margin-top: 525px; margin-left: 310px"></a>
<a target="_blank" href="os_design-files/mem_ds.html#mem_free_list"
style="position: absolute; height: 30px; width: 290px; margin-top: 562px; margin-left: 310px"></a>
<a target="_blank" href="os_design-files/mem_ds.html#buffer_table"
style="position: absolute; height: 30px; width: 290px; margin-top: 602px; margin-left: 310px"></a>
<a target="_blank" href="os_design-files/process_table.html#per_page_table"
style="position: absolute; height: 32px; width: 135px; margin-top: 155px; margin-left: 310px"></a>
<a target="_blank" href="os_design-files/process_table.html#disk_map_table"
style="position: absolute; height: 32px; width: 137px; margin-top: 155px; margin-left: 460px"></a>
<a target="_blank" href="os_design-files/process_table.html#per_process_table"
style="position: absolute; height: 32px; width: 135px; margin-top: 195px; margin-left: 310px"></a>
<a target="_blank" href="os_design-files/process_table.html#kernel_stack"
style="position: absolute; height: 32px; width: 137px; margin-top: 195px; margin-left: 460px"></a>
</div>
</div>
</div>
<br>
<br>
<div class="panel-group" id="accordion">
<div class="panel panel-default">
<div class="panel-heading">
<h4 class="panel-title">
<a href="os_design-files/state_diag.html" target="_blank"><span
class="fa fa-check-square-o"></span>Process State Transition Diagram</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_design-files/nexpos.html" target="_blank" style="color:red"><span
class="fa fa-check-square-o"></span>eXpOS Design for NEXSM (two core) Machine</a>
</h4>
</div>
<div class="panel-heading" style="margin-left:1.8em">
<h4 class="panel-title">
<a href="os_design-files/mem_ds.html#al_table" target="_blank" style="color:red"><span
class="fa fa-check-square-o"></span>Access Lock Table</a>
</h4>
</div>
<div class="panel-heading" style="margin-left:1.8em">
<h4 class="panel-title">
<a href="os_modules/Module_8.html" target="_blank" style="color:red"><span
class="fa fa-check-square-o"></span>Access Control Module</a>
</h4>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</section>
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<p><a href="http://www.nitc.ac.in/">National Institute of Technology, Calicut</a></p>
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