1<html><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 V1.78.1"><link rel="home" href="index.html" title="Unreliable Guide To Hacking The Linux Kernel"><link rel="up" href="common-routines.html" title="Chapter 6. Common Routines"><link rel="prev" href="routines-udelay.html" title="mdelay()/udelay() include/asm/delay.h include/linux/delay.h"><link rel="next" href="routines-local-irqs.html" title="local_irq_save()/local_irq_restore() include/linux/irqflags.h"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><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> 2 <code class="filename">include/asm/byteorder.h</code> 3 </th></tr><tr><td width="20%" align="left"><a accesskey="p" href="routines-udelay.html">Prev</a> </td><th width="60%" align="center">Chapter 6. Common Routines</th><td width="20%" align="right"> <a accesskey="n" href="routines-local-irqs.html">Next</a></td></tr></table><hr></div><div class="sect1"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="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> 4 <code class="filename">include/asm/byteorder.h</code> 5 </h2></div></div></div><p> 6 The <code class="function">cpu_to_be32()</code> family (where the "32" can 7 be replaced by 64 or 16, and the "be" can be replaced by "le") are 8 the general way to do endian conversions in the kernel: they 9 return the converted value. All variations supply the reverse as 10 well: <code class="function">be32_to_cpu()</code>, etc. 11 </p><p> 12 There are two major variations of these functions: the pointer 13 variation, such as <code class="function">cpu_to_be32p()</code>, which take 14 a pointer to the given type, and return the converted value. The 15 other variation is the "in-situ" family, such as 16 <code class="function">cpu_to_be32s()</code>, which convert value referred 17 to by the pointer, and return void. 18 </p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="routines-udelay.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="common-routines.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="routines-local-irqs.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><code class="function">mdelay()</code>/<code class="function">udelay()</code> 19 <code class="filename">include/asm/delay.h</code> 20 <code class="filename">include/linux/delay.h</code> 21  </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> 22 <code class="filename">include/linux/irqflags.h</code> 23 </td></tr></table></div></body></html> 24