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Name.Decorator */ .highlight .ne { color: #bb0066; font-weight: bold } /* Name.Exception */ .highlight .nf { color: #0066bb; font-weight: bold } /* Name.Function */ .highlight .nl { color: #336699; font-style: italic } /* Name.Label */ .highlight .nn { color: #bb0066; font-weight: bold } /* Name.Namespace */ .highlight .py { color: #336699; font-weight: bold } /* Name.Property */ .highlight .nt { color: #bb0066; font-weight: bold } /* Name.Tag */ .highlight .nv { color: #336699 } /* Name.Variable */ .highlight .ow { color: #008800 } /* Operator.Word */ .highlight .w { color: #bbbbbb } /* Text.Whitespace */ .highlight .mb { color: #0000DD; font-weight: bold } /* Literal.Number.Bin */ .highlight .mf { color: #0000DD; font-weight: bold } /* Literal.Number.Float */ .highlight .mh { color: #0000DD; font-weight: bold } /* Literal.Number.Hex */ .highlight .mi { color: #0000DD; font-weight: bold } /* Literal.Number.Integer */ .highlight .mo { color: #0000DD; font-weight: bold } /* Literal.Number.Oct */ .highlight .sa { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Affix */ .highlight .sb { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Backtick */ .highlight .sc { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Char */ .highlight .dl { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Delimiter */ .highlight .sd { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Doc */ .highlight .s2 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Double */ .highlight .se { color: #0044dd; background-color: #fff0f0 } /* Literal.String.Escape */ .highlight .sh { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Heredoc */ .highlight .si { color: #3333bb; background-color: #fff0f0 } /* Literal.String.Interpol */ .highlight .sx { color: #22bb22; background-color: #f0fff0 } /* Literal.String.Other */ .highlight .sr { color: #008800; background-color: #fff0ff } /* Literal.String.Regex */ .highlight .s1 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Single */ .highlight .ss { color: #aa6600; background-color: #fff0f0 } /* Literal.String.Symbol */ .highlight .bp { color: #003388 } /* Name.Builtin.Pseudo */ .highlight .fm { color: #0066bb; font-weight: bold } /* Name.Function.Magic */ .highlight .vc { color: #336699 } /* Name.Variable.Class */ .highlight .vg { color: #dd7700 } /* Name.Variable.Global */ .highlight .vi { color: #3333bb } /* Name.Variable.Instance */ .highlight .vm { color: #336699 } /* Name.Variable.Magic */ .highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */
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<title>Mu - ex2.subx</title>
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<a href='https://github.com/akkartik/mu/blob/main/ex2.subx'>https://github.com/akkartik/mu/blob/main/ex2.subx</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># Test out the video mode by filling in the screen with pixels.</span>
<span id="L2" class="LineNr"> 2 </span><span class="subxComment">#</span>
<span id="L3" class="LineNr"> 3 </span><span class="subxComment"># To build a disk image:</span>
<span id="L4" class="LineNr"> 4 </span><span class="subxComment">#   ./translate_subx boot.subx ex2.subx   # emits disk.img</span>
<span id="L5" class="LineNr"> 5 </span><span class="subxComment"># To run:</span>
<span id="L6" class="LineNr"> 6 </span><span class="subxComment">#   qemu-system-i386 disk.img</span>
<span id="L7" class="LineNr"> 7 </span><span class="subxComment"># Or:</span>
<span id="L8" class="LineNr"> 8 </span><span class="subxComment">#   bochs -f bochsrc                      # bochsrc loads disk.img</span>
<span id="L9" class="LineNr"> 9 </span>
<span id="L10" class="LineNr">10 </span>== code
<span id="L11" class="LineNr">11 </span>
<span id="L12" class="LineNr">12 </span><span class="SpecialChar">Entry</span>:
<span id="L13" class="LineNr">13 </span>  <span class="subxComment"># ecx &lt;- start of video memory</span>
<span id="L14" class="LineNr">14 </span>  8b/-&gt; *<span class="SpecialChar"><a href='boot.subx.html#L547'>Video-memory-addr</a></span> 1/r32/ecx
<span id="L15" class="LineNr">15 </span>
<span id="L16" class="LineNr">16 </span>  <span class="subxComment"># eax &lt;- final pixel of video memory</span>
<span id="L17" class="LineNr">17 </span>  8d/copy-address *(ecx + 0x0bffff) 0/r32/eax  <span class="subxComment"># 0xbffff = 1024*768 - 1</span>
<span id="L18" class="LineNr">18 </span>
<span id="L19" class="LineNr">19 </span>  <span class="subxComment"># for each pixel in video memory</span>
<span id="L20" class="LineNr">20 </span>  {
<span id="L21" class="LineNr">21 </span>    39/compare %eax 1/r32/ecx
<span id="L22" class="LineNr">22 </span>    7c/jump-if-&lt; <span class="Constant">break</span>/disp8
<span id="L23" class="LineNr">23 </span>    <span class="subxComment"># write its column number to it</span>
<span id="L24" class="LineNr">24 </span>    88/byte&lt;- *eax 0/r32/AL
<span id="L25" class="LineNr">25 </span>    48/decrement-eax
<span id="L26" class="LineNr">26 </span>    eb/jump <span class="Constant">loop</span>/disp8
<span id="L27" class="LineNr">27 </span>  }
<span id="L28" class="LineNr">28 </span>
<span id="L29" class="LineNr">29 </span>  <span class="subxComment"># hang indefinitely</span>
<span id="L30" class="LineNr">30 </span>  {
<span id="L31" class="LineNr">31 </span>    eb/jump <span class="Constant">loop</span>/disp8
<span id="L32" class="LineNr">32 </span>  }
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