mirror of
https://github.com/Zeal-Operating-System/ZealOS.git
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45 lines
2.3 KiB
HTML
45 lines
2.3 KiB
HTML
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<!DOCTYPE HTML>
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html;charset=US-ASCII">
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<meta name="generator" content="ZealOS V0.05">
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<style type="text/css">
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body {background-color:#000000;}
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.cF0{color:#ffffff;background-color:#000000;}
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.cF1{color:#3465a4;background-color:#000000;}
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.cF2{color:#4e9a06;background-color:#000000;}
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.cF3{color:#06989a;background-color:#000000;}
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.cF4{color:#a24444;background-color:#000000;}
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.cF5{color:#75507b;background-color:#000000;}
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.cF6{color:#ce982f;background-color:#000000;}
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.cF7{color:#bcc0b9;background-color:#000000;}
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.cF8{color:#555753;background-color:#000000;}
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.cF9{color:#729fcf;background-color:#000000;}
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.cFA{color:#82bc49;background-color:#000000;}
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.cFB{color:#34e2e2;background-color:#000000;}
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.cFC{color:#ac3535;background-color:#000000;}
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.cFD{color:#ad7fa8;background-color:#000000;}
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.cFE{color:#fce94f;background-color:#000000;}
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.cFF{color:#000000;background-color:#000000;}
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</style>
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</head>
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<body>
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<pre style="font-family:courier;font-size:10pt">
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<a name="l1"></a><span class=cF0>
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<a name="l2"></a></span><span class=cF5>These take a pointer to a bit field.</span><span class=cF0>
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<a name="l3"></a></span><span class=cF2>Bt</span><span class=cF0>: Bit Test
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<a name="l4"></a></span><span class=cF2>Bts</span><span class=cF0>: Bit Test and Set to one
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<a name="l5"></a></span><span class=cF2>Btr</span><span class=cF0>: Bit Test and Reset to zero
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<a name="l6"></a></span><span class=cF2>Btc</span><span class=cF0>: Bit Test and Compliment (toggle)
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<a name="l7"></a></span><span class=cF2>BEqual</span><span class=cF0>: Set bit to value.
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<a name="l8"></a>
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<a name="l9"></a>Bit operations are "atomic", no interrupt between the reading and writing the bit, important when multitasking. For multicore
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<a name="l10"></a>use "locked" forms.
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<a name="l11"></a>
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<a name="l12"></a></span><span class=cF5>These don't take a pointer, but the actual field.</span><span class=cF0>
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<a name="l13"></a></span><span class=cF2>Bsf</span><span class=cF0>: Bit Scan Forward (Pos of first low one bit or -1)
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<a name="l14"></a></span><span class=cF2>Bsr</span><span class=cF0>: Bit Scan Reverse (Pos of first high one bit or -1)
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<a name="l15"></a></span><span class=cF2>PopCount</span><span class=cF0>: Population Count (Count of set bits)
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</span></pre></body>
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</html>
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