blog_os/blog/templates/first-edition/comments/page-tables.html

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<div id="isso-root"><div id="isso-53" class="isso-comment isso-no-votes"><div class="avatar"><svg version="1.1" viewBox="0 0 48 48" preserveAspectRatio="xMinYMin meet" shape-rendering="crispEdges" data-hash="666df3217240"><rect x="0" y="0" width="56" height="56" style="fill: #f0f0f0"></rect><rect x="4" y="12" width="8" height="8" style="fill: #9abf88"></rect><rect x="36" y="12" width="8" height="8" style="fill: #9abf88"></rect><rect x="4" y="28" width="8" height="8" style="fill: #9abf88"></rect><rect x="36" y="28" width="8" height="8" style="fill: #9abf88"></rect><rect x="4" y="36" width="8" height="8" style="fill: #9abf88"></rect><rect x="36" y="36" width="8" height="8" style="fill: #9abf88"></rect><rect x="12" y="4" width="8" height="8" style="fill: #9abf88"></rect><rect x="28" y="4" width="8" height="8" style="fill: #9abf88"></rect><rect x="12" y="28" width="8" height="8" style="fill: #9abf88"></rect><rect x="28" y="28" width="8" height="8" style="fill: #9abf88"></rect><rect x="20" y="12" width="8" height="8" style="fill: #9abf88"></rect></svg></div><div class="text-wrapper"><div role="meta" class="isso-comment-header"><span class="author">Philipp Oppermann</span><span class="spacer">•</span><a rel="nofollow" href="#isso-53" class="permalink"><time title="Thu Dec 10 2015 19:30:43 GMT+0100 (Central European Standard Time)" datetime="2015-11-04T18:30:43Z">vor 3 Jahren</time></a><span class="note"></span></div><div class="text"><p>There is some interesting discussion on <a rel="nofollow" href="https://www.reddit.com/r/programming/comments/3w7sps/write_an_os_in_rust_accessing_and_modifying_page/">/r/programming</a> and <a rel="nofollow" href="https://www.reddit.com/r/rust/comments/3w31ow/writing_an_os_in_rust_accessing_and_modifying/">/r/rust</a>.</p></div><div class="isso-comment-footer"><span class="votes">0</span><a rel="nofollow" href="#" class="upvote"><!-- Generator: IcoMoon.io --><svg width="16" height="16" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" fill="gray">
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  <p>Somewhat annoyingly, 10 bits are needed since 513 values need to be represented. Thus one could use three bits from each of the first four entries.</p>

  <p>x86-64 has a 64-byte cache line size so the four accesses do fit in a single cache line.</p></div><div class="isso-comment-footer"><span class="votes">0</span><a rel="nofollow" href="#" class="upvote"><!-- Generator: IcoMoon.io --><svg width="16" height="16" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" fill="gray">
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  First of all; This is an amazing project, thank you very much for your time and effort, and the work put down into doing this!
  I am a complete beginner in Rust, and follow this guide mainly to get a better grasp on operating system "basics". Your tutorials have been very good at explaining the code snippets in a simple manner, but sometimes it gets a bit confusing as to where functions and other code snippets should be placed in the file tree.. If you find the time, could you write the path/filename of where each code snippet goes? I'm sure it would be very helpful to other people who, like me, are not yet intuitive about "what parts go where".</p></div><div class="isso-comment-footer"><span class="votes">0</span><a rel="nofollow" href="#" class="upvote"><!-- Generator: IcoMoon.io --><svg width="16" height="16" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" fill="gray">
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  <p>println!("{:#x}", unsafe {
      *(Page::containing_address(addr).start_address() as *const u64)
  });</p></div><div class="isso-comment-footer"><span class="votes">0</span><a rel="nofollow" href="#" class="upvote"><!-- Generator: IcoMoon.io --><svg width="16" height="16" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" fill="gray">
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  <p>It seems that as soon as I enable x86 paging the VGA buffer is not accessible anymore (because 0xb8000 is not identity mapped yet?). So essentially the test_paging routine doesnt print anything... so my thinking tells me the identity map is the first thing to do after enabling paging, yet its the subject of the next chapter, am I not getting something?</p></div><div class="isso-comment-footer"><span class="votes">0</span><a rel="nofollow" href="#" class="upvote"><!-- Generator: IcoMoon.io --><svg width="16" height="16" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" fill="gray">
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  I'm working on x86 protected mode so I only have p1,p2 and my huge pages are 4MiB.</p></div><div class="isso-comment-footer"><span class="votes">0</span><a rel="nofollow" href="#" class="upvote"><!-- Generator: IcoMoon.io --><svg width="16" height="16" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" fill="gray">
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{% endraw %}