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| author | Kartik Agaram <vc@akkartik.com> | 2020-12-29 19:28:56 -0800 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2020-12-29 19:28:56 -0800 |
| commit | 395f736d1ae339f9b633ae36e10b42fbca2d26f9 (patch) | |
| tree | d683df6e631ba831c0c7feaacbf6f2a42b6d989e /html/baremetal/ex2.subx.html | |
| parent | c35ae0085ceff4cd86a815714cd8ffa6406a287a (diff) | |
| download | mu-395f736d1ae339f9b633ae36e10b42fbca2d26f9.tar.gz | |
7464
Diffstat (limited to 'html/baremetal/ex2.subx.html')
| -rw-r--r-- | html/baremetal/ex2.subx.html | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/html/baremetal/ex2.subx.html b/html/baremetal/ex2.subx.html new file mode 100644 index 00000000..ae4eb8a8 --- /dev/null +++ b/html/baremetal/ex2.subx.html @@ -0,0 +1,93 @@ +<!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/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 { } +.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/master/baremetal/ex2.subx'>https://github.com/akkartik/mu/blob/master/baremetal/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_baremetal baremetal/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 baremetal/boot.bochsrc # boot.bochsrc loads disk.img</span> +<span id="L9" class="LineNr"> 9 </span> +<span id="L10" class="LineNr">10 </span><span class="subxComment"># main: (address 0x8800)</span> +<span id="L11" class="LineNr">11 </span> +<span id="L12" class="LineNr">12 </span>== code +<span id="L13" class="LineNr">13 </span> +<span id="L14" class="LineNr">14 </span><span class="subxComment"># ecx <- start of video memory</span> +<span id="L15" class="LineNr">15 </span>8b/-> 0/mod/indirect 5/rm32/use-disp32 0x7f28/disp32/video-memory 1/r32/ecx +<span id="L16" class="LineNr">16 </span> +<span id="L17" class="LineNr">17 </span><span class="subxComment"># eax <- final pixel of video memory</span> +<span id="L18" class="LineNr">18 </span>8d/copy-address *(ecx + 0x0bffff) 0/r32/eax <span class="subxComment"># 0xbffff = 1024*768 - 1</span> +<span id="L19" class="LineNr">19 </span> +<span id="L20" class="LineNr">20 </span><span class="subxComment"># for each pixel in video memory</span> +<span id="L21" class="LineNr">21 </span>{ +<span id="L22" class="LineNr">22 </span> 39/compare %eax 1/r32/ecx +<span id="L23" class="LineNr">23 </span> 7c/jump-if-< <span class="Constant">break</span>/disp8 +<span id="L24" class="LineNr">24 </span> <span class="subxComment"># write its column number to it</span> +<span id="L25" class="LineNr">25 </span> 88/byte<- *eax 0/r32/AL +<span id="L26" class="LineNr">26 </span> 48/decrement-eax +<span id="L27" class="LineNr">27 </span> eb/jump <span class="Constant">loop</span>/disp8 +<span id="L28" class="LineNr">28 </span>} +<span id="L29" class="LineNr">29 </span> +<span id="L30" class="LineNr">30 </span><span class="subxComment"># hang indefinitely</span> +<span id="L31" class="LineNr">31 </span>{ +<span id="L32" class="LineNr">32 </span> eb/jump <span class="Constant">loop</span>/disp8 +<span id="L33" class="LineNr">33 </span>} +<span id="L34" class="LineNr">34 </span> +<span id="L35" class="LineNr">35 </span><span class="subxComment"># vim:ft=subx</span> +</pre> +</body> +</html> +<!-- vim: set foldmethod=manual : --> |