92 lines
4.3 KiB
HTML
92 lines
4.3 KiB
HTML
<!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 - ex2.subx</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; }
|
|
.subxComment { color: #005faf; }
|
|
.LineNr { }
|
|
.SpecialChar { color: #d70000; }
|
|
.Constant { color: #008787; }
|
|
-->
|
|
</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/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 <- start of video memory</span>
|
|
<span id="L14" class="LineNr">14 </span> 8b/-> *<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 <- 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-< <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<- *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> }
|
|
</pre>
|
|
</body>
|
|
</html>
|
|
<!-- vim: set foldmethod=manual : -->
|