html/baremetal/ex2.hex.html


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<a href='https://github.com/akkartik/mu/blob/master/baremetal/ex2.hex'>https://github.com/akkartik/mu/blob/master/baremetal/ex2.hex</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 run, first prepare a realistically sized disk image:</span>
<span id="L4" class="LineNr"> 4 </span><span class="subxComment">#   dd if=/dev/zero of=disk.img count=20160  # 512-byte sectors, so 10MB</span>
<span id="L5" class="LineNr"> 5 </span><span class="subxComment"># Load the program on the disk image:</span>
<span id="L6" class="LineNr"> 6 </span><span class="subxComment">#   cat baremetal/boot.hex baremetal/ex2.hex  |./bootstrap run apps/hex  &gt; a.bin</span>
<span id="L7" class="LineNr"> 7 </span><span class="subxComment">#   dd if=a.bin of=disk.img conv=notrunc</span>
<span id="L8" class="LineNr"> 8 </span><span class="subxComment"># To run:</span>
<span id="L9" class="LineNr"> 9 </span><span class="subxComment">#   qemu-system-i386 disk.img</span>
<span id="L10" class="LineNr">10 </span><span class="subxComment"># Or:</span>
<span id="L11" class="LineNr">11 </span><span class="subxComment">#   bochs -f apps/boot.bochsrc  # boot.bochsrc loads disk.img</span>
<span id="L12" class="LineNr">12 </span>
<span id="L13" class="LineNr">13 </span><span class="subxComment"># main:  (address 0x8800)</span>
<span id="L14" class="LineNr">14 </span>
<span id="L15" class="LineNr">15 </span><span class="subxComment"># ecx &lt;- LFB</span>
<span id="L16" class="LineNr">16 </span>8b  <span class="subxComment"># copy *rm32 to r32</span>
<span id="L17" class="LineNr">17 </span>  0d  <span class="subxComment"># 00/mod/indirect 001/r32/ecx 101/rm32/use-disp32</span>
<span id="L18" class="LineNr">18 </span>  68 7d 00 00 <span class="subxComment"># disp32</span>
<span id="L19" class="LineNr">19 </span>
<span id="L20" class="LineNr">20 </span><span class="subxComment"># eax &lt;- LFB + 0xbffff (1024*768 - 1)</span>
<span id="L21" class="LineNr">21 </span>8d  <span class="subxComment"># copy-address rm32 to r32</span>
<span id="L22" class="LineNr">22 </span>  81  <span class="subxComment"># 10/mod/*+disp32 000/r32/eax 001/rm32/ecx</span>
<span id="L23" class="LineNr">23 </span>  ff ff 0b 00  <span class="subxComment"># disp32</span>
<span id="L24" class="LineNr">24 </span>
<span id="L25" class="LineNr">25 </span><span class="subxComment"># $loop:</span>
<span id="L26" class="LineNr">26 </span><span class="subxComment"># if (eax &lt; ecx) break</span>
<span id="L27" class="LineNr">27 </span>39  <span class="subxComment"># compare rm32 with r32</span>
<span id="L28" class="LineNr">28 </span>  c8  <span class="subxComment"># 11/mod/direct 001/r32/ecx 000/rm32/eax</span>
<span id="L29" class="LineNr">29 </span>7c 05  <span class="subxComment"># break if &lt;</span>
<span id="L30" class="LineNr">30 </span><span class="subxComment"># *eax &lt;- al</span>
<span id="L31" class="LineNr">31 </span>88  <span class="subxComment"># copy r8 to m8 at r32</span>
<span id="L32" class="LineNr">32 </span>  00  <span class="subxComment"># 00/mod/indirect 000/r8/AL 000/rm32/eax</span>
<span id="L33" class="LineNr">33 </span>48  <span class="subxComment"># decrement eax</span>
<span id="L34" class="LineNr">34 </span>eb f7  <span class="subxComment"># loop to -9 bytes</span>
<span id="L35" class="LineNr">35 </span>
<span id="L36" class="LineNr">36 </span><span class="subxComment"># $break:</span>
<span id="L37" class="LineNr">37 </span>e9 fb ff ff ff  <span class="subxComment"># hang indefinitely</span>
<span id="L38" class="LineNr">38 </span>
<span id="L39" class="LineNr">39 </span><span class="subxComment"># vim&#0058;ft=subx</span>
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