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index12.html
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<!DOCTYPE html>
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<article>
<h2><a href="http://jhshi.me/2012/04/19/os161-virtual-memory-resources/index.html">OS161 Virtual Memory Resources</a></h2>
<div class="well well-sm">
<footer class="post-info">
<span class="label label-default">Date</span>
<span class="published">
<i class="fa fa-calendar"></i><time datetime="2012-04-19T18:29:56-04:00"> Thu 19 April 2012</time>
</span>
<span class="label label-default">Category</span>
<a href="http://jhshi.me/blog/category/os161/index.html">os161</a>
<span class="label label-default">Tags</span>
<a href="http://jhshi.me/blog/tag/vm/index.html">vm</a>
/
<a href="http://jhshi.me/blog/tag/resources/index.html">resources</a>
</footer><!-- /.post-info --> </div>
<div class="summary"><p>Here are various documents that I found helpful for implementing OS161 virtual
memory system. </p>
<a class="btn btn-default btn-xs" href="http://jhshi.me/2012/04/19/os161-virtual-memory-resources/index.html">more ...</a>
</div>
</article>
<hr/>
<article>
<h2><a href="http://jhshi.me/2012/03/28/os161-arguments-passing-in-system-call/index.html">OS161: Arguments Passing in System Call</a></h2>
<div class="well well-sm">
<footer class="post-info">
<span class="label label-default">Date</span>
<span class="published">
<i class="fa fa-calendar"></i><time datetime="2012-03-28T21:59:26-04:00"> Wed 28 March 2012</time>
</span>
<span class="label label-default">Category</span>
<a href="http://jhshi.me/blog/category/os161/index.html">os161</a>
<span class="label label-default">Tags</span>
<a href="http://jhshi.me/blog/tag/syscall/index.html">syscall</a>
/
<a href="http://jhshi.me/blog/tag/argument-passing/index.html">argument passing</a>
/
<a href="http://jhshi.me/blog/tag/copyin/index.html">copyin</a>
/
<a href="http://jhshi.me/blog/tag/copyout/index.html">copyout</a>
</footer><!-- /.post-info --> </div>
<div class="summary"><p>One principle of kernel programming is that: <strong>do not trust anything users
passed in</strong>. Since we assume that users are bad, they will do anything they can
to crash the kernel (just as <code>$OS161_SRC/user/testbin/badcall/badcall.c</code> do). So
we need pay special attention to the arguments of the system calls, <strong>especially the
pointers</strong>.</p>
<a class="btn btn-default btn-xs" href="http://jhshi.me/2012/03/28/os161-arguments-passing-in-system-call/index.html">more ...</a>
</div>
</article>
<hr/>
<article>
<h2><a href="http://jhshi.me/2012/03/21/os161-general-tips-for-system-call/index.html">OS161: General Tips for System Call</a></h2>
<div class="well well-sm">
<footer class="post-info">
<span class="label label-default">Date</span>
<span class="published">
<i class="fa fa-calendar"></i><time datetime="2012-03-21T14:45:32-04:00"> Wed 21 March 2012</time>
</span>
<span class="label label-default">Category</span>
<a href="http://jhshi.me/blog/category/os161/index.html">os161</a>
<span class="label label-default">Tags</span>
<a href="http://jhshi.me/blog/tag/bmake/index.html">bmake</a>
/
<a href="http://jhshi.me/blog/tag/ctags/index.html">ctags</a>
/
<a href="http://jhshi.me/blog/tag/gdb/index.html">gdb</a>
/
<a href="http://jhshi.me/blog/tag/syscall/index.html">syscall</a>
</footer><!-- /.post-info --> </div>
<div class="summary"><p>Here are some practice that will hopefully make you feel more comfortable and
more productive when you poking around with os161 syscalls.</p>
<a class="btn btn-default btn-xs" href="http://jhshi.me/2012/03/21/os161-general-tips-for-system-call/index.html">more ...</a>
</div>
</article>
<hr/>
<article>
<h2><a href="http://jhshi.me/2012/03/21/os161-how-to-add-a-system-call/index.html">OS161: How to Add a System Call</a></h2>
<div class="well well-sm">
<footer class="post-info">
<span class="label label-default">Date</span>
<span class="published">
<i class="fa fa-calendar"></i><time datetime="2012-03-21T14:15:41-04:00"> Wed 21 March 2012</time>
</span>
<span class="label label-default">Category</span>
<a href="http://jhshi.me/blog/category/os161/index.html">os161</a>
<span class="label label-default">Tags</span>
<a href="http://jhshi.me/blog/tag/syscall/index.html">syscall</a>
</footer><!-- /.post-info --> </div>
<div class="summary"><p>Let's use the <code>fork</code> system call as an example. For convinience, let's assume
<code>$OS161_SRC</code> is your os161 source root directory.</p>
<a class="btn btn-default btn-xs" href="http://jhshi.me/2012/03/21/os161-how-to-add-a-system-call/index.html">more ...</a>
</div>
</article>
<hr/>
<article>
<h2><a href="http://jhshi.me/2012/03/18/os161-process-scheduling/index.html">OS161 Process Scheduling</a></h2>
<div class="well well-sm">
<footer class="post-info">
<span class="label label-default">Date</span>
<span class="published">
<i class="fa fa-calendar"></i><time datetime="2012-03-18T15:19:27-04:00"> Sun 18 March 2012</time>
</span>
<span class="label label-default">Category</span>
<a href="http://jhshi.me/blog/category/os161/index.html">os161</a>
<span class="label label-default">Tags</span>
<a href="http://jhshi.me/blog/tag/scheduling/index.html">scheduling</a>
/
<a href="http://jhshi.me/blog/tag/mlfq/index.html">MLFQ</a>
</footer><!-- /.post-info --> </div>
<div class="summary"><p>OS161 provides a simple round-robin scheduler by default. It works like this: </p>
<ul>
<li>
<p><code>hardclock</code> from <code>$OS161_SRC/kern/thread/clock.c</code> will be periodically called
(from hardware clock interrupt handler)</p>
</li>
<li>
<p>Two functions may be called there after:</p>
<ul>
<li><code>schedule</code> to change the order the threads in ready queue, which currently
does nothing</li>
<li><code>thread_consider_migraton</code> to enable thread migration among CPU cores</li>
</ul>
</li>
<li>
<p>Then it will call <code>thread_yield</code> to cause the current thread yield to another
thread</p>
</li>
</ul>
<p>We need to play with the <code>schedule</code> function to give interactive threads higher
priority.</p>
<a class="btn btn-default btn-xs" href="http://jhshi.me/2012/03/18/os161-process-scheduling/index.html">more ...</a>
</div>
</article>
<hr/>
<article>
<h2><a href="http://jhshi.me/2012/03/14/os161-file-system-calls/index.html">OS161 File System Calls</a></h2>
<div class="well well-sm">
<footer class="post-info">
<span class="label label-default">Date</span>
<span class="published">
<i class="fa fa-calendar"></i><time datetime="2012-03-14T21:19:17-04:00"> Wed 14 March 2012</time>
</span>
<span class="label label-default">Category</span>
<a href="http://jhshi.me/blog/category/os161/index.html">os161</a>
<span class="label label-default">Tags</span>
<a href="http://jhshi.me/blog/tag/open/index.html">open</a>
/
<a href="http://jhshi.me/blog/tag/read/index.html">read</a>
/
<a href="http://jhshi.me/blog/tag/write/index.html">write</a>
/
<a href="http://jhshi.me/blog/tag/close/index.html">close</a>
/
<a href="http://jhshi.me/blog/tag/dup2/index.html">dup2</a>
/
<a href="http://jhshi.me/blog/tag/lseek/index.html">lseek</a>
/
<a href="http://jhshi.me/blog/tag/syscall/index.html">syscall</a>
</footer><!-- /.post-info --> </div>
<div class="summary"><p>Assume you've read my previous post on <a href="/2012/03/14/os161-file-operation-overview/">file operations in OS161</a>,
then everything is quite straightforward. One more thing, remember to protect
every access to the file descriptor data structure using lock!</p>
<p>Let's get started.</p>
<a class="btn btn-default btn-xs" href="http://jhshi.me/2012/03/14/os161-file-system-calls/index.html">more ...</a>
</div>
</article>
<hr/>
<article>
<h2><a href="http://jhshi.me/2012/03/14/os161-file-operation-overview/index.html">OS161 File Operation Overview</a></h2>
<div class="well well-sm">
<footer class="post-info">
<span class="label label-default">Date</span>
<span class="published">
<i class="fa fa-calendar"></i><time datetime="2012-03-14T20:33:50-04:00"> Wed 14 March 2012</time>
</span>
<span class="label label-default">Category</span>
<a href="http://jhshi.me/blog/category/os161/index.html">os161</a>
<span class="label label-default">Tags</span>
<a href="http://jhshi.me/blog/tag/file/index.html">file</a>
/
<a href="http://jhshi.me/blog/tag/syscall/index.html">syscall</a>
/
<a href="http://jhshi.me/blog/tag/fdtable/index.html">fdtable</a>
</footer><!-- /.post-info --> </div>
<div class="summary"><p>In user space, when open a file, user program will get a file descriptor (a
integer) that represent that file. User can use this descriptor to perform various
operations on this file: read, write, seek, etc. As I see it, this design is
quite clean in that:</p>
<ul>
<li>
<p>Hide most of the details from user, for both safety and simplicity</p>
</li>
<li>
<p>Enable more high level abstraction: everything (socket, pipe..) is a file</p>
</li>
</ul>
<p>The file descriptor is actually an index to kernel space structure that
contains all the details of opened files. So at kernel side, we need to do a
lot bookkeeping stuff.</p>
<a class="btn btn-default btn-xs" href="http://jhshi.me/2012/03/14/os161-file-operation-overview/index.html">more ...</a>
</div>
</article>
<hr/>
<article>
<h2><a href="http://jhshi.me/2012/03/12/os161-exit-and-waitpid-system-call/index.html">OS161 exit and waitpid System Call</a></h2>
<div class="well well-sm">
<footer class="post-info">
<span class="label label-default">Date</span>
<span class="published">
<i class="fa fa-calendar"></i><time datetime="2012-03-12T15:51:46-04:00"> Mon 12 March 2012</time>
</span>
<span class="label label-default">Category</span>
<a href="http://jhshi.me/blog/category/os161/index.html">os161</a>
<span class="label label-default">Tags</span>
<a href="http://jhshi.me/blog/tag/exit/index.html">exit</a>
/
<a href="http://jhshi.me/blog/tag/waitpid/index.html">waitpid</a>
/
<a href="http://jhshi.me/blog/tag/syscall/index.html">syscall</a>
</footer><!-- /.post-info --> </div>
<div class="summary"><p>Before going on, assume you've read my previous post on <a href="/2012/03/12/os161-pid-management">pid management</a></p>
<p>Thanks to the <code>struct process</code>, our work is much simplified. Quoting <a href="http://en.wikipedia.org/wiki/Eric_S._Raymond">Eric S.Raymond </a>
here.</p>
<blockquote>
<p>Smart data structures and dumb code works a lot better than the other way
around.</p>
</blockquote>
<a class="btn btn-default btn-xs" href="http://jhshi.me/2012/03/12/os161-exit-and-waitpid-system-call/index.html">more ...</a>
</div>
</article>
<hr/>
<article>
<h2><a href="http://jhshi.me/2012/03/12/os161-pid-management/index.html">OS161 pid Management</a></h2>
<div class="well well-sm">
<footer class="post-info">
<span class="label label-default">Date</span>
<span class="published">
<i class="fa fa-calendar"></i><time datetime="2012-03-12T15:13:54-04:00"> Mon 12 March 2012</time>
</span>
<span class="label label-default">Category</span>
<a href="http://jhshi.me/blog/category/os161/index.html">os161</a>
<span class="label label-default">Tags</span>
<a href="http://jhshi.me/blog/tag/pid/index.html">pid</a>
/
<a href="http://jhshi.me/blog/tag/syscall/index.html">syscall</a>
</footer><!-- /.post-info --> </div>
<div class="summary"><p>There are many way to manage each process's pid. Here is the way I do it.</p>
<p>I decided to make minimal modification to <code>$OS161_SRC/kern/thread/thread.c</code>,
in case anything is ruined. So I only add two things to the thread module. One
is I add a <code>t_pid</code> field to <code>struct thread</code> so that <code>getpid</code> system call is
trivial. Another is I add a call of <code>pid_alloc</code> in <code>thread_alloc</code> to initialize
new thread's <code>t_pid</code>. That's it. No more touch on the thread module.</p>
<a class="btn btn-default btn-xs" href="http://jhshi.me/2012/03/12/os161-pid-management/index.html">more ...</a>
</div>
</article>
<hr/>
<article>
<h2><a href="http://jhshi.me/2012/03/11/os161-execv-system-call/index.html">OS161 execv System Call</a></h2>
<div class="well well-sm">
<footer class="post-info">
<span class="label label-default">Date</span>
<span class="published">
<i class="fa fa-calendar"></i><time datetime="2012-03-11T22:27:47-04:00"> Sun 11 March 2012</time>
</span>
<span class="label label-default">Category</span>
<a href="http://jhshi.me/blog/category/os161/index.html">os161</a>
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<a href="http://jhshi.me/blog/tag/execv/index.html">execv</a>
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<a href="http://jhshi.me/blog/tag/syscall/index.html">syscall</a>
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<div class="summary"><p>Basically, <code>execv</code> do more or less the same thing with <code>runprogram</code> in
<code>$OS161_SRC/kern/syscall/runprogram.c</code>. The overall flow of <code>sys_execv</code> are:</p>
<ol>
<li><em>Copy arguments from user space into kernel buffer</em></li>
<li>Open the executable, create a new address space and load the elf into it</li>
<li><em>Copy the arguments from kernel buffer into user stack</em></li>
<li>Return user mode using <code>enter_new_process</code></li>
</ol>
<a class="btn btn-default btn-xs" href="http://jhshi.me/2012/03/11/os161-execv-system-call/index.html">more ...</a>
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