Update xv6

_posts/2017-07-08-intro-xv6.md

@@ -0,0 +1,31 @@
+---
+layout: post
+title:  "Xv6 introduction"
+date:   2017-07-28 14:56:55 -0400
+categories: xv6
+---
+
+I hate xv6, a stupid, useless education-oriented system. In this article, I will generally talk about how to implement system call to this operating system.
+
+-------
+
+## Xv6 Systemcall
+To invoke a system call, we have to first define a user mode function to be the interface of the kernel instruction  in file *user.h*.
+
+~~~~c
+void function (void);
+~~~~
+
+This interface-like function will then pass the function name, in this case function, to *usys.S*. When using user mode function in programs, *usys.S* will generate a reference to SYS_function and push system call number of this function into %eax. After that, system can know from *syscall.c* and determining whether this system call is available. We must define same name system function and add it into *syscall.h* and *syscall.c*.
+
+~~~~c
+#define SYS_function ##		// ## is the system call number
+
+[SYS_function]  sys_function	// real system function name
+
+extern int sys_function(void);	// real system function declaration
+~~~~
+
+After adding these sentences to syscall files, we can implement real function in specific place where you want to make the function works well.
+
+Sometimes, we need to pass variables among system calls. In this case, variables’ values are not necessary and even can’t be pass directly into system_function. When invoke a system call function, all variables of this system call will be pushed into current process’ stack. In file *syscall.c*, multiple functions are provided to get these variables from the process. I won’t waste time on explaining how to use these functions especially when elegant and detailed comments were written in source codes. However, I will explain concepts and how process organized and works in xv6 in future articles.

_site/404.html

@@ -102,7 +102,9 @@
   <div class="col-box-title">Newest Posts</div>
   <ul class="post-list">
     
-      <li><a class="post-link" href="/archivers/term-comp">Short talk about Unikernels</a></li>
+      <li><a class="post-link" href="/archivers/intro-xv6">Xv6 introduction</a></li>
+    
+      <li><a class="post-link" href="/archivers/intro-unikernel">Short talk about Unikernels</a></li>
     
       <li><a class="post-link" href="/archivers/some-of-my-previews-exper-work">Some of my previews experiment works: 2016</a></li>
     

_site/about/index.html

@@ -186,7 +186,9 @@ Niagara Falls, NY, USA, 2017.</li>
   <div class="col-box-title">Newest Posts</div>
   <ul class="post-list">
     
-      <li><a class="post-link" href="/archivers/term-comp">Short talk about Unikernels</a></li>
+      <li><a class="post-link" href="/archivers/intro-xv6">Xv6 introduction</a></li>
+    
+      <li><a class="post-link" href="/archivers/intro-unikernel">Short talk about Unikernels</a></li>
     
       <li><a class="post-link" href="/archivers/some-of-my-previews-exper-work">Some of my previews experiment works: 2016</a></li>
     

_site/archivers/charles-is-not-a-good-tool.html

@@ -133,7 +133,9 @@ You also need to save charles Root Certificate, it also contains in the same men
   <div class="col-box-title">Newest Posts</div>
   <ul class="post-list">
     
-      <li><a class="post-link" href="/archivers/term-comp">Short talk about Unikernels</a></li>
+      <li><a class="post-link" href="/archivers/intro-xv6">Xv6 introduction</a></li>
+    
+      <li><a class="post-link" href="/archivers/intro-unikernel">Short talk about Unikernels</a></li>
     
       <li><a class="post-link" href="/archivers/some-of-my-previews-exper-work">Some of my previews experiment works: 2016</a></li>
     

_site/archivers/hello.html

@@ -104,7 +104,9 @@
   <div class="col-box-title">Newest Posts</div>
   <ul class="post-list">
     
-      <li><a class="post-link" href="/archivers/term-comp">Short talk about Unikernels</a></li>
+      <li><a class="post-link" href="/archivers/intro-xv6">Xv6 introduction</a></li>
+    
+      <li><a class="post-link" href="/archivers/intro-unikernel">Short talk about Unikernels</a></li>
     
       <li><a class="post-link" href="/archivers/some-of-my-previews-exper-work">Some of my previews experiment works: 2016</a></li>
     

_site/archivers/intro-unikernel.html

@@ -10,7 +10,7 @@
   <meta name="description" content="What is Unikernel?Unikernels are specialised, single-address-space images contructed by using library operating systems.">
 
   <link rel="stylesheet" href="/css/main.css">
-  <link rel="canonical" href="https://codersherlock.github.com//archivers/term-comp">
+  <link rel="canonical" href="https://codersherlock.github.com//archivers/intro-unikernel">
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@@ -121,7 +121,9 @@
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-      <li><a class="post-link" href="/archivers/term-comp">Short talk about Unikernels</a></li>
+      <li><a class="post-link" href="/archivers/intro-xv6">Xv6 introduction</a></li>
+    
+      <li><a class="post-link" href="/archivers/intro-unikernel">Short talk about Unikernels</a></li>
     
       <li><a class="post-link" href="/archivers/some-of-my-previews-exper-work">Some of my previews experiment works: 2016</a></li>
     

_site/archivers/intro-xv6.html

@@ -0,0 +1,160 @@
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+    <h1 class="post-title">Xv6 introduction</h1>
+    <p class="post-meta">Jul 28, 2017</p>
+  </header>
+
+  <article class="post-content">
+    <p>I hate xv6, a stupid, useless education-oriented system. In this article, I will generally talk about how to implement system call to this operating system.</p>
+
+<hr />
+
+<h2 id="xv6-systemcall">Xv6 Systemcall</h2>
+<p>To invoke a system call, we have to first define a user mode function to be the interface of the kernel instruction  in file <em>user.h</em>.</p>
+
+<div class="language-c highlighter-rouge"><pre class="highlight"><code><span class="kt">void</span> <span class="n">function</span> <span class="p">(</span><span class="kt">void</span><span class="p">);</span>
+</code></pre>
+</div>
+
+<p>This interface-like function will then pass the function name, in this case function, to <em>usys.S</em>. When using user mode function in programs, <em>usys.S</em> will generate a reference to SYS_function and push system call number of this function into %eax. After that, system can know from <em>syscall.c</em> and determining whether this system call is available. We must define same name system function and add it into <em>syscall.h</em> and <em>syscall.c</em>.</p>
+
+<div class="language-c highlighter-rouge"><pre class="highlight"><code><span class="cp">#define SYS_function ##		// ## is the system call number
+</span>
+<span class="p">[</span><span class="n">SYS_function</span><span class="p">]</span>  <span class="n">sys_function</span>	<span class="c1">// real system function name
+</span>
+<span class="k">extern</span> <span class="kt">int</span> <span class="n">sys_function</span><span class="p">(</span><span class="kt">void</span><span class="p">);</span>	<span class="c1">// real system function declaration
+</span></code></pre>
+</div>
+
+<p>After adding these sentences to syscall files, we can implement real function in specific place where you want to make the function works well.</p>
+
+<p>Sometimes, we need to pass variables among system calls. In this case, variables’ values are not necessary and even can’t be pass directly into system_function. When invoke a system call function, all variables of this system call will be pushed into current process’ stack. In file <em>syscall.c</em>, multiple functions are provided to get these variables from the process. I won’t waste time on explaining how to use these functions especially when elegant and detailed comments were written in source codes. However, I will explain concepts and how process organized and works in xv6 in future articles.</p>
+
+  </article>
+  
+  
+
+
+
+
+</div>
+
+        </div>
+        <div class="col-second">
+          <div class="col-box col-box-author">
+  <img class="avatar" src="/static/avatar.jpg" alt="Pengzhan Hao - 碾子">
+  <div class="col-box-title name">Pengzhan Hao - 碾子</div>
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+    
+    <a href="https://github.com/codersherlock">GitHub</a>
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+  </p>
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+
+<div class="col-box">
+  <div class="col-box-title">Newest Posts</div>
+  <ul class="post-list">
+    
+      <li><a class="post-link" href="/archivers/intro-xv6">Xv6 introduction</a></li>
+    
+      <li><a class="post-link" href="/archivers/intro-unikernel">Short talk about Unikernels</a></li>
+    
+      <li><a class="post-link" href="/archivers/some-of-my-previews-exper-work">Some of my previews experiment works: 2016</a></li>
+    
+      <li><a class="post-link" href="/archivers/charles-is-not-a-good-tool">Using charles proxy to monitor mobile SSL traffics</a></li>
+    
+      <li><a class="post-link" href="/archivers/hello">Stop Talking is the worst title of one blog</a></li>
+    
+  </ul>
+</div>
+
+<div class="col-box post-toc hide">
+  <div class="col-box-title">TOC</div>
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_site/archivers/some-of-my-previews-exper-work.html

@@ -217,7 +217,9 @@ dd <span class="k">if</span><span class="o">=</span>/dev/block/mmcblk0p37 <span
   <div class="col-box-title">Newest Posts</div>
   <ul class="post-list">
     
-      <li><a class="post-link" href="/archivers/term-comp">Short talk about Unikernels</a></li>
+      <li><a class="post-link" href="/archivers/intro-xv6">Xv6 introduction</a></li>
+    
+      <li><a class="post-link" href="/archivers/intro-unikernel">Short talk about Unikernels</a></li>
     
       <li><a class="post-link" href="/archivers/some-of-my-previews-exper-work">Some of my previews experiment works: 2016</a></li>
     

_site/category/index.html

@@ -99,7 +99,15 @@
 <h2 class="category" id="unikernel">UNIKERNEL</h2>
 <ul>
 
-<li><span>Jul 26</span> » <a href="/archivers/term-comp">Short talk about Unikernels</a></li>
+<li><span>Jul 26</span> » <a href="/archivers/intro-unikernel">Short talk about Unikernels</a></li>
+
+</ul>
+
+
+<h2 class="category" id="xv6">XV6</h2>
+<ul>
+
+<li><span>Jul 28</span> » <a href="/archivers/intro-xv6">Xv6 introduction</a></li>
 
 </ul>
 
@@ -131,7 +139,9 @@
   <div class="col-box-title">Newest Posts</div>
   <ul class="post-list">
     
-      <li><a class="post-link" href="/archivers/term-comp">Short talk about Unikernels</a></li>
+      <li><a class="post-link" href="/archivers/intro-xv6">Xv6 introduction</a></li>
+    
+      <li><a class="post-link" href="/archivers/intro-unikernel">Short talk about Unikernels</a></li>
     
       <li><a class="post-link" href="/archivers/some-of-my-previews-exper-work">Some of my previews experiment works: 2016</a></li>
     

_site/feed.xml

@@ -6,10 +6,46 @@
 </description>
     <link>https://codersherlock.github.com//</link>
     <atom:link href="https://codersherlock.github.com//feed.xml" rel="self" type="application/rss+xml"/>
-    <pubDate>Wed, 26 Jul 2017 12:52:19 -0400</pubDate>
+    <pubDate>Fri, 28 Jul 2017 15:25:24 -0400</pubDate>
-    <lastBuildDate>Wed, 26 Jul 2017 12:52:19 -0400</lastBuildDate>
+    <lastBuildDate>Fri, 28 Jul 2017 15:25:24 -0400</lastBuildDate>
     <generator>Jekyll v3.5.1</generator>
     
+      <item>
+        <title>Xv6 introduction</title>
+        <description>&lt;p&gt;I hate xv6, a stupid, useless education-oriented system. In this article, I will generally talk about how to implement system call to this operating system.&lt;/p&gt;
+
+&lt;hr /&gt;
+
+&lt;h2 id=&quot;xv6-systemcall&quot;&gt;Xv6 Systemcall&lt;/h2&gt;
+&lt;p&gt;To invoke a system call, we have to first define a user mode function to be the interface of the kernel instruction  in file &lt;em&gt;user.h&lt;/em&gt;.&lt;/p&gt;
+
+&lt;div class=&quot;language-c highlighter-rouge&quot;&gt;&lt;pre class=&quot;highlight&quot;&gt;&lt;code&gt;&lt;span class=&quot;kt&quot;&gt;void&lt;/span&gt; &lt;span class=&quot;n&quot;&gt;function&lt;/span&gt; &lt;span class=&quot;p&quot;&gt;(&lt;/span&gt;&lt;span class=&quot;kt&quot;&gt;void&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;);&lt;/span&gt;
+&lt;/code&gt;&lt;/pre&gt;
+&lt;/div&gt;
+
+&lt;p&gt;This interface-like function will then pass the function name, in this case function, to &lt;em&gt;usys.S&lt;/em&gt;. When using user mode function in programs, &lt;em&gt;usys.S&lt;/em&gt; will generate a reference to SYS_function and push system call number of this function into %eax. After that, system can know from &lt;em&gt;syscall.c&lt;/em&gt; and determining whether this system call is available. We must define same name system function and add it into &lt;em&gt;syscall.h&lt;/em&gt; and &lt;em&gt;syscall.c&lt;/em&gt;.&lt;/p&gt;
+
+&lt;div class=&quot;language-c highlighter-rouge&quot;&gt;&lt;pre class=&quot;highlight&quot;&gt;&lt;code&gt;&lt;span class=&quot;cp&quot;&gt;#define SYS_function ##		// ## is the system call number
+&lt;/span&gt;
+&lt;span class=&quot;p&quot;&gt;[&lt;/span&gt;&lt;span class=&quot;n&quot;&gt;SYS_function&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;]&lt;/span&gt;  &lt;span class=&quot;n&quot;&gt;sys_function&lt;/span&gt;	&lt;span class=&quot;c1&quot;&gt;// real system function name
+&lt;/span&gt;
+&lt;span class=&quot;k&quot;&gt;extern&lt;/span&gt; &lt;span class=&quot;kt&quot;&gt;int&lt;/span&gt; &lt;span class=&quot;n&quot;&gt;sys_function&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;(&lt;/span&gt;&lt;span class=&quot;kt&quot;&gt;void&lt;/span&gt;&lt;span class=&quot;p&quot;&gt;);&lt;/span&gt;	&lt;span class=&quot;c1&quot;&gt;// real system function declaration
+&lt;/span&gt;&lt;/code&gt;&lt;/pre&gt;
+&lt;/div&gt;
+
+&lt;p&gt;After adding these sentences to syscall files, we can implement real function in specific place where you want to make the function works well.&lt;/p&gt;
+
+&lt;p&gt;Sometimes, we need to pass variables among system calls. In this case, variables’ values are not necessary and even can’t be pass directly into system_function. When invoke a system call function, all variables of this system call will be pushed into current process’ stack. In file &lt;em&gt;syscall.c&lt;/em&gt;, multiple functions are provided to get these variables from the process. I won’t waste time on explaining how to use these functions especially when elegant and detailed comments were written in source codes. However, I will explain concepts and how process organized and works in xv6 in future articles.&lt;/p&gt;
+</description>
+        <pubDate>Fri, 28 Jul 2017 14:56:55 -0400</pubDate>
+        <link>https://codersherlock.github.com//archivers/intro-xv6</link>
+        <guid isPermaLink="true">https://codersherlock.github.com//archivers/intro-xv6</guid>
+        
+        
+        <category>xv6</category>
+        
+      </item>
+    
       <item>
         <title>Short talk about Unikernels</title>
         <description>&lt;h2 id=&quot;what-is-unikernel&quot;&gt;What is Unikernel?&lt;/h2&gt;
@@ -32,8 +68,8 @@
 
 </description>
         <pubDate>Wed, 26 Jul 2017 12:42:33 -0400</pubDate>
-        <link>https://codersherlock.github.com//archivers/term-comp</link>
+        <link>https://codersherlock.github.com//archivers/intro-unikernel</link>
-        <guid isPermaLink="true">https://codersherlock.github.com//archivers/term-comp</guid>
+        <guid isPermaLink="true">https://codersherlock.github.com//archivers/intro-unikernel</guid>
         
         
         <category>unikernel</category>

_site/index.html

@@ -71,7 +71,24 @@
     
       <li>
         <h2>
-          <a class="post-link" href="/archivers/term-comp">Short talk about Unikernels</a>
+          <a class="post-link" href="/archivers/intro-xv6">Xv6 introduction</a>
+        </h2>
+        
+        <div class="post-meta">Jul 28, 2017</div>
+
+        <div class="post-excerpt">
+          <p>I hate xv6, a stupid, useless education-oriented system. In this article, I will generally talk about how to implement system call to this operating system.</p>
+
+
+          <p>
+            <a class="post-link" href="/archivers/intro-xv6">Read More &raquo;</a>
+          </p>
+        </div>
+      </li>
+    
+      <li>
+        <h2>
+          <a class="post-link" href="/archivers/intro-unikernel">Short talk about Unikernels</a>
         </h2>
         
         <div class="post-meta">Jul 26, 2017</div>
@@ -82,7 +99,7 @@
 
 
           <p>
-            <a class="post-link" href="/archivers/term-comp">Read More &raquo;</a>
+            <a class="post-link" href="/archivers/intro-unikernel">Read More &raquo;</a>
           </p>
         </div>
       </li>
@@ -176,7 +193,9 @@ My current solution is using AP to forward all SSL traffic to a proxy, <a href="
   <div class="col-box-title">Newest Posts</div>
   <ul class="post-list">
     
-      <li><a class="post-link" href="/archivers/term-comp">Short talk about Unikernels</a></li>
+      <li><a class="post-link" href="/archivers/intro-xv6">Xv6 introduction</a></li>
+    
+      <li><a class="post-link" href="/archivers/intro-unikernel">Short talk about Unikernels</a></li>
     
       <li><a class="post-link" href="/archivers/some-of-my-previews-exper-work">Some of my previews experiment works: 2016</a></li>