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<!DOCTYPE html>
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<article>
<h2><a href="http://jhshi.me/2012/05/04/line-buffered-cat/index.html">Line Buffered Cat</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="2012-05-04T14:44:15-04:00"> Fri 04 May 2012</time>
</span>
<span class="label label-default">Category</span>
<a href="http://jhshi.me/blog/category/linux/index.html">linux</a>
<span class="label label-default">Tags</span>
<a href="http://jhshi.me/blog/tag/cat/index.html">cat</a>
/
<a href="http://jhshi.me/blog/tag/grep/index.html">grep</a>
</footer><!-- /.post-info --> </div>
<div class="summary"><p>I'd like to watch the output of a UART device in Linux, and I only want to see
the content when there are a whole line. So I prefer some kind of line-buffered
cat such as:</p>
<a class="btn btn-default btn-xs" href="http://jhshi.me/2012/05/04/line-buffered-cat/index.html">more ...</a>
</div>
</article>
<hr/>
<article>
<h2><a href="http://jhshi.me/2012/05/02/os161-same_stack-check-fail-in-trap/index.html">OS161 SAME_STACK Check Fail in Trap</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="2012-05-02T18:02:11-04:00"> Wed 02 May 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/stack/index.html">stack</a>
</footer><!-- /.post-info --> </div>
<div class="summary"><p>There are several <code>SAME_STACK</code> asserts in <code>$OS161_SRC/kern/arch/mips/locore/trap.c</code> to
ensure that <strong>current thread did not run out of kernel stack</strong>. </p>
<a class="btn btn-default btn-xs" href="http://jhshi.me/2012/05/02/os161-same_stack-check-fail-in-trap/index.html">more ...</a>
</div>
</article>
<hr/>
<article>
<h2><a href="http://jhshi.me/2012/05/02/os161-duplicated-tlb-entries/index.html">OS161 Duplicated TLB entries</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="2012-05-02T17:18:47-04:00"> Wed 02 May 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/tlb/index.html">tlb</a>
/
<a href="http://jhshi.me/blog/tag/vm/index.html">vm</a>
</footer><!-- /.post-info --> </div>
<div class="summary"><p>Sys161 will panic if you try to write a TLB entry with a <code>entryhi</code>, but
there are already a TLB entry with the same <code>entryhi</code> but in a different TLB
slot. This is because <strong>entryhi should be a UNIQUE key in the TLB bank.</strong></p>
<a class="btn btn-default btn-xs" href="http://jhshi.me/2012/05/02/os161-duplicated-tlb-entries/index.html">more ...</a>
</div>
</article>
<hr/>
<article>
<h2><a href="http://jhshi.me/2012/04/28/os161-swapping/index.html">OS161 Swapping</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="2012-04-28T17:27:39-04:00"> Sat 28 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/swap/index.html">swap</a>
/
<a href="http://jhshi.me/blog/tag/vm/index.html">vm</a>
</footer><!-- /.post-info --> </div>
<div class="summary"><p>Now that you can <a href="/2012/04/24/os161-physical-page-management">allocate/free physical pages</a>, and you have <a href="/2012/04/27/os161-tlb-miss-and-page-fault">demand paging
through handling TLB miss</a>. Let's get the final part work: swapping.</p>
<a class="btn btn-default btn-xs" href="http://jhshi.me/2012/04/28/os161-swapping/index.html">more ...</a>
</div>
</article>
<hr/>
<article>
<h2><a href="http://jhshi.me/2012/04/27/os161-tlb-miss-and-page-fault/index.html">OS161 TLB Miss and Page Fault</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="2012-04-27T23:27:26-04:00"> Fri 27 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/tlb/index.html">tlb</a>
/
<a href="http://jhshi.me/blog/tag/page-fault/index.html">page fault</a>
/
<a href="http://jhshi.me/blog/tag/vm/index.html">vm</a>
</footer><!-- /.post-info --> </div>
<div class="summary"><p>Now we've set up user address space, it's time to handle TLB/page faults. Note
that there is a difference between TLB and page faults:</p>
<ul>
<li>
<p>TLB fault means the hardware don't know how to translate a virtual address
since the translation didn't present in any TLB entry. So the hardware raise a
TLB fault to let the kernel decide how to translate that address.</p>
</li>
<li>
<p>Page fault means the user program tries to access a page that is not in
memory, either not yet allocated or swapped out.</p>
</li>
</ul>
<a class="btn btn-default btn-xs" href="http://jhshi.me/2012/04/27/os161-tlb-miss-and-page-fault/index.html">more ...</a>
</div>
</article>
<hr/>
<article>
<h2><a href="http://jhshi.me/2012/04/27/os161-sbrk-system-call/index.html">OS161 sbrk 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="2012-04-27T22:17:36-04:00"> Fri 27 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/heap/index.html">heap</a>
/
<a href="http://jhshi.me/blog/tag/sbrk/index.html">sbrk</a>
/
<a href="http://jhshi.me/blog/tag/syscall/index.html">syscall</a>
/
<a href="http://jhshi.me/blog/tag/vm/index.html">vm</a>
</footer><!-- /.post-info --> </div>
<div class="summary"><p>If you're not familiar with <code>sbrk</code> system call, here is <a href="http://en.wikipedia.org/wiki/Sbrk">it's wiki</a>,
and its <a href="http://www.cs.utah.edu/flux/moss/node39.html">interface description</a>. In a nutshell,
<code>malloc</code> will use <code>sbrk</code> to get heap space.</p>
<a class="btn btn-default btn-xs" href="http://jhshi.me/2012/04/27/os161-sbrk-system-call/index.html">more ...</a>
</div>
</article>
<hr/>
<article>
<h2><a href="http://jhshi.me/2012/04/27/sshscp-without-password/index.html">ssh/scp without password</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="2012-04-27T16:45:41-04:00"> Fri 27 April 2012</time>
</span>
<span class="label label-default">Category</span>
<a href="http://jhshi.me/blog/category/linux/index.html">linux</a>
<span class="label label-default">Tags</span>
<a href="http://jhshi.me/blog/tag/ssh/index.html">ssh</a>
/
<a href="http://jhshi.me/blog/tag/scp/index.html">scp</a>
</footer><!-- /.post-info --> </div>
<div class="summary"><p>Suppose you have two machines: A and B. A is your work machine, you do most of
your work on it. But B is a little special (e.g., connected to some specific
hardware) that you need to ssh on it or copy some file from A to B from time to
time. Here is the way that you can get rid of entering passwords every time you
do ssh/scp.</p>
<a class="btn btn-default btn-xs" href="http://jhshi.me/2012/04/27/sshscp-without-password/index.html">more ...</a>
</div>
</article>
<hr/>
<article>
<h2><a href="http://jhshi.me/2012/04/24/os161-user-address-space/index.html">OS161 User Address Space</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="2012-04-24T23:14:14-04:00"> Tue 24 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/addrspace/index.html">addrspace</a>
/
<a href="http://jhshi.me/blog/tag/vm/index.html">vm</a>
/
<a href="http://jhshi.me/blog/tag/page-table/index.html">page table</a>
</footer><!-- /.post-info --> </div>
<div class="summary"><p>Now we've set up our coremap and also have the routines to allocate and free
physical pages. It's the time to set up user's virtual address space.</p>
<p>Basically, we'll adopt <em>two-level page table</em>. If you're not
already familiar with this, you can check out the <a href="http://en.wikipedia.org/wiki/Page_table">page table wiki</a>
and <a href="http://pages.cs.wisc.edu/~remzi/OSFEP/vm-tlbs.pdf">this document talking about MIPS and X86 paging</a>.</p>
<a class="btn btn-default btn-xs" href="http://jhshi.me/2012/04/24/os161-user-address-space/index.html">more ...</a>
</div>
</article>
<hr/>
<article>
<h2><a href="http://jhshi.me/2012/04/24/os161-physical-page-management/index.html">OS161 Physical Page 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="2012-04-24T22:11:05-04:00"> Tue 24 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/coremap/index.html">coremap</a>
</footer><!-- /.post-info --> </div>
<div class="summary"><p>We'll talk about <code>page_alloc</code>, <code>page_free</code>, <code>alloc_kpages</code> and <code>free_kpages</code>.</p>
<a class="btn btn-default btn-xs" href="http://jhshi.me/2012/04/24/os161-physical-page-management/index.html">more ...</a>
</div>
</article>
<hr/>
<article>
<h2><a href="http://jhshi.me/2012/04/24/os161-coremap/index.html">OS161 Coremap</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="2012-04-24T21:35:28-04:00"> Tue 24 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/coremap/index.html">coremap</a>
</footer><!-- /.post-info --> </div>
<div class="summary"><p>The first concern of OS161 virtual memory system is how to manage physical
pages. Generally, we can pack a physical page's information into a structure
(called <code>struct coremap_entry</code>) and <strong>use this struct to represent a physical page</strong>.
<strong>We use an array of <code>struct coremap_entry</code> to keep all physical pages information.</strong>
This array, aka, <strong>coremap</strong>, will be one of the most important data structure in this lab.</p>
<a class="btn btn-default btn-xs" href="http://jhshi.me/2012/04/24/os161-coremap/index.html">more ...</a>
</div>
</article>
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