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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>cpu_to_be32()/be32_to_cpu()/cpu_to_le32()/le32_to_cpu() include/asm/byteorder.h</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="Unreliable Guide To Hacking The Linux Kernel" /><link rel="up" href="ch06.html" title="Chapter 6. Common Routines" /><link rel="prev" href="ch06s05.html" title="mdelay()/udelay() include/asm/delay.h include/linux/delay.h" /><link rel="next" href="ch06s07.html" title="local_irq_save()/local_irq_restore() include/asm/system.h" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><code class="function">cpu_to_be32()</code>/<code class="function">be32_to_cpu()</code>/<code class="function">cpu_to_le32()</code>/<code class="function">le32_to_cpu()</code>
<code class="filename">include/asm/byteorder.h</code>
</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch06s05.html">Prev</a> </td><th width="60%" align="center">Chapter 6. Common Routines</th><td width="20%" align="right"> <a accesskey="n" href="ch06s07.html">Next</a></td></tr></table><hr /></div><div class="sect1" title="cpu_to_be32()/be32_to_cpu()/cpu_to_le32()/le32_to_cpu() include/asm/byteorder.h"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="routines-endian"></a><code class="function">cpu_to_be32()</code>/<code class="function">be32_to_cpu()</code>/<code class="function">cpu_to_le32()</code>/<code class="function">le32_to_cpu()</code>
<code class="filename">include/asm/byteorder.h</code>
</h2></div></div></div><p>
The <code class="function">cpu_to_be32()</code> family (where the "32" can
be replaced by 64 or 16, and the "be" can be replaced by "le") are
the general way to do endian conversions in the kernel: they
return the converted value. All variations supply the reverse as
well: <code class="function">be32_to_cpu()</code>, etc.
</p><p>
There are two major variations of these functions: the pointer
variation, such as <code class="function">cpu_to_be32p()</code>, which take
a pointer to the given type, and return the converted value. The
other variation is the "in-situ" family, such as
<code class="function">cpu_to_be32s()</code>, which convert value referred
to by the pointer, and return void.
</p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ch06s05.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch06.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="ch06s07.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><code class="function">mdelay()</code>/<code class="function">udelay()</code>
<code class="filename">include/asm/delay.h</code>
<code class="filename">include/linux/delay.h</code>
 </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <code class="function">local_irq_save()</code>/<code class="function">local_irq_restore()</code>
<code class="filename">include/asm/system.h</code>
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