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authorKartik Agaram <vc@akkartik.com>2020-12-19 20:59:40 -0800
committerKartik Agaram <vc@akkartik.com>2020-12-19 21:06:05 -0800
commita84fadd65d923fbb71c5c2b9884972114a0c2928 (patch)
tree1f8ae0f80656c86db8bedc28ba6c484dbf961626 /subx.md
parentcbe8bfd87a4273993647ecdcd821e59521122c57 (diff)
downloadmu-a84fadd65d923fbb71c5c2b9884972114a0c2928.tar.gz
7355 - learning to boot into 32-bit mode
These exercises are from the incomplete "Writing a simple operating system
from scratch" by Nick Blundell.
  https://www.cs.bham.ac.uk/~exr/lectures/opsys/10_11/lectures/os-dev.pdf
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generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2024-11-30 09:34:38 +0000


 


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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<head>
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<title>Mu - factorial.mu</title>
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<pre id='vimCodeElement'>
<span class="Comment"># example program: compute the factorial of 5</span>

<span class="muRecipe">recipe</span> main [
  <span class="Identifier">default-space</span>:address:array:location<span class="Special"> &lt;- </span>new location:type, <span class="Constant">30:literal</span>
  x:number<span class="Special"> &lt;- </span>factorial <span class="Constant">5:literal</span>
 <span class="Identifier"> $print</span> <span class="Constant">[result: ]</span>, x:number, <span class="Constant">[ </span>
<span class="Constant">]</span>
]

<span class="muRecipe">recipe</span> factorial [
  <span class="Identifier">default-space</span>:address:array:location<span class="Special"> &lt;- </span>new location:type, <span class="Constant">30:literal</span>
  n:number<span class="Special"> &lt;- </span><span class="Identifier">next-ingredient</span>
  <span class="Delimiter">{</span>
    <span class="Comment"># if n=0 return 1</span>
    zero?:boolean<span class="Special"> &lt;- </span>equal n:number, <span class="Constant">0:literal</span>
    <span class="Identifier">break-unless</span> zero?:boolean
    <span class="Identifier">reply</span> <span class="Constant">1:literal</span>
  <span class="Delimiter">}</span>
  <span class="Comment"># return n * factorial(n - 1)</span>
  x:number<span class="Special"> &lt;- </span>subtract n:number, <span class="Constant">1:literal</span>
  subresult:number<span class="Special"> &lt;- </span>factorial x:number
  result:number<span class="Special"> &lt;- </span>multiply subresult:number, n:number
  <span class="Identifier">reply</span> result:number
]

<span class="Comment"># unit test</span>
<span class="muScenario">scenario</span> factorial-test [
  run [
    1:number<span class="Special"> &lt;- </span>factorial <span class="Constant">5:literal</span>
  ]
  memory-should-contain [
    1<span class="Special"> &lt;- </span>120
  ]
]
</pre>
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