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authorKartik Agaram <vc@akkartik.com>2021-01-13 19:06:34 -0800
committerKartik Agaram <vc@akkartik.com>2021-01-13 19:06:34 -0800
commitb4af05394ae60a372053f48095104e2965791569 (patch)
tree7d3faac280af8a046e489b7272d66e6153cf3c85 /html/baremetal/ex7.mu.html
parentec0d5bb17e22e31c0edfc1b9b1e95ef363d690e7 (diff)
downloadmu-b4af05394ae60a372053f48095104e2965791569.tar.gz
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+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
+<html>
+<head>
+<meta http-equiv="content-type" content="text/html; charset=UTF-8">
+<title>Mu - baremetal/ex7.mu</title>
+<meta name="Generator" content="Vim/8.1">
+<meta name="plugin-version" content="vim8.1_v1">
+<meta name="syntax" content="none">
+<meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy=">
+<meta name="colorscheme" content="minimal-light">
+<style type="text/css">
+<!--
+pre { white-space: pre-wrap; font-family: monospace; color: #000000; background-color: #c6c6c6; }
+body { font-size:12pt; font-family: monospace; color: #000000; background-color: #c6c6c6; }
+a { color:inherit; }
+* { font-size:12pt; font-size: 1em; }
+.PreProc { color: #c000c0; }
+.LineNr { }
+.Constant { color: #008787; }
+.SpecialChar { color: #d70000; }
+.Delimiter { color: #c000c0; }
+.muFunction { color: #af5f00; text-decoration: underline; }
+.muComment { color: #005faf; }
+-->
+</style>
+
+<script type='text/javascript'>
+<!--
+
+/* function to open any folds containing a jumped-to line before jumping to it */
+function JumpToLine()
+{
+  var lineNum;
+  lineNum = window.location.hash;
+  lineNum = lineNum.substr(1); /* strip off '#' */
+
+  if (lineNum.indexOf('L') == -1) {
+    lineNum = 'L'+lineNum;
+  }
+  var lineElem = document.getElementById(lineNum);
+  /* Always jump to new location even if the line was hidden inside a fold, or
+   * we corrected the raw number to a line ID.
+   */
+  if (lineElem) {
+    lineElem.scrollIntoView(true);
+  }
+  return true;
+}
+if ('onhashchange' in window) {
+  window.onhashchange = JumpToLine;
+}
+
+-->
+</script>
+</head>
+<body onload='JumpToLine();'>
+<a href='https://github.com/akkartik/mu/blob/main/baremetal/ex7.mu'>https://github.com/akkartik/mu/blob/main/baremetal/ex7.mu</a>
+<pre id='vimCodeElement'>
+<span id="L1" class="LineNr"> 1 </span><span class="muComment"># Cursor-based motions.</span>
+<span id="L2" class="LineNr"> 2 </span><span class="muComment">#</span>
+<span id="L3" class="LineNr"> 3 </span><span class="muComment"># To build a disk image:</span>
+<span id="L4" class="LineNr"> 4 </span><span class="muComment">#   ./translate_mu_baremetal baremetal/ex7.mu     # emits disk.img</span>
+<span id="L5" class="LineNr"> 5 </span><span class="muComment"># To run:</span>
+<span id="L6" class="LineNr"> 6 </span><span class="muComment">#   qemu-system-i386 disk.img</span>
+<span id="L7" class="LineNr"> 7 </span><span class="muComment"># Or:</span>
+<span id="L8" class="LineNr"> 8 </span><span class="muComment">#   bochs -f baremetal/boot.bochsrc               # boot.bochsrc loads disk.img</span>
+<span id="L9" class="LineNr"> 9 </span><span class="muComment">#</span>
+<span id="L10" class="LineNr">10 </span><span class="muComment"># Expected output: an interactive game a bit like &quot;snakes&quot;. Try pressing h, j,</span>
+<span id="L11" class="LineNr">11 </span><span class="muComment"># k, l.</span>
+<span id="L12" class="LineNr">12 </span>
+<span id="L13" class="LineNr">13 </span><span class="PreProc">fn</span> <span class="muFunction">main</span> <span class="Delimiter">{</span>
+<span id="L14" class="LineNr">14 </span>  <span class="Delimiter">{</span>
+<span id="L15" class="LineNr">15 </span>    <span class="PreProc">var</span> key/<span class="Constant">eax</span>: byte <span class="SpecialChar">&lt;-</span> <a href='102keyboard.subx.html#L3'>read-key</a> <span class="Constant">0</span>
+<span id="L16" class="LineNr">16 </span>    <span class="Delimiter">{</span>
+<span id="L17" class="LineNr">17 </span>      compare key, <span class="Constant">0x68</span>  <span class="muComment"># 'h'</span>
+<span id="L18" class="LineNr">18 </span>      <span class="PreProc">break-if-!=</span>
+<span id="L19" class="LineNr">19 </span>      <span class="PreProc">var</span> g/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0x2d</span>  <span class="muComment"># '-'</span>
+<span id="L20" class="LineNr">20 </span>      draw-grapheme-at-cursor <span class="Constant">0</span>, g, <span class="Constant">0x31</span>
+<span id="L21" class="LineNr">21 </span>      cursor-left <span class="Constant">0</span>
+<span id="L22" class="LineNr">22 </span>    <span class="Delimiter">}</span>
+<span id="L23" class="LineNr">23 </span>    <span class="Delimiter">{</span>
+<span id="L24" class="LineNr">24 </span>      compare key, <span class="Constant">0x6a</span>  <span class="muComment"># 'j'</span>
+<span id="L25" class="LineNr">25 </span>      <span class="PreProc">break-if-!=</span>
+<span id="L26" class="LineNr">26 </span>      <span class="PreProc">var</span> g/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0x7c</span>  <span class="muComment"># '|'</span>
+<span id="L27" class="LineNr">27 </span>      draw-grapheme-at-cursor <span class="Constant">0</span>, g, <span class="Constant">0x31</span>
+<span id="L28" class="LineNr">28 </span>      cursor-down <span class="Constant">0</span>
+<span id="L29" class="LineNr">29 </span>    <span class="Delimiter">}</span>
+<span id="L30" class="LineNr">30 </span>    <span class="Delimiter">{</span>
+<span id="L31" class="LineNr">31 </span>      compare key, <span class="Constant">0x6b</span>  <span class="muComment"># 'k'</span>
+<span id="L32" class="LineNr">32 </span>      <span class="PreProc">break-if-!=</span>
+<span id="L33" class="LineNr">33 </span>      <span class="PreProc">var</span> g/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0x7c</span>  <span class="muComment"># '|'</span>
+<span id="L34" class="LineNr">34 </span>      draw-grapheme-at-cursor <span class="Constant">0</span>, g, <span class="Constant">0x31</span>
+<span id="L35" class="LineNr">35 </span>      cursor-up <span class="Constant">0</span>
+<span id="L36" class="LineNr">36 </span>    <span class="Delimiter">}</span>
+<span id="L37" class="LineNr">37 </span>    <span class="Delimiter">{</span>
+<span id="L38" class="LineNr">38 </span>      compare key, <span class="Constant">0x6c</span>  <span class="muComment"># 'l'</span>
+<span id="L39" class="LineNr">39 </span>      <span class="PreProc">break-if-!=</span>
+<span id="L40" class="LineNr">40 </span>      <span class="PreProc">var</span> g/<span class="Constant">eax</span>: grapheme <span class="SpecialChar">&lt;-</span> copy <span class="Constant">0x2d</span>  <span class="muComment"># '-'</span>
+<span id="L41" class="LineNr">41 </span>      draw-grapheme-at-cursor <span class="Constant">0</span>, g, <span class="Constant">0x31</span>
+<span id="L42" class="LineNr">42 </span>      cursor-right <span class="Constant">0</span>
+<span id="L43" class="LineNr">43 </span>    <span class="Delimiter">}</span>
+<span id="L44" class="LineNr">44 </span>    <span class="PreProc">loop</span>
+<span id="L45" class="LineNr">45 </span>  <span class="Delimiter">}</span>
+<span id="L46" class="LineNr">46 </span><span class="Delimiter">}</span>
+</pre>
+</body>
+</html>
+<!-- vim: set foldmethod=manual : -->

 

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