1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>virt_to_phys</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Bus-Independent Device Accesses"><link rel="up" href="pubfunctions.html" title="Chapter 5. Public Functions Provided"><link rel="prev" href="pubfunctions.html" title="Chapter 5. Public Functions Provided"><link rel="next" href="API-phys-to-virt.html" title="phys_to_virt"></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"><span class="phrase">virt_to_phys</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="pubfunctions.html">Prev</a> </td><th width="60%" align="center">Chapter 5. Public Functions Provided</th><td width="20%" align="right"> <a accesskey="n" href="API-phys-to-virt.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-virt-to-phys"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>virt_to_phys — 2 map virtual addresses to physical 3 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">phys_addr_t <b class="fsfunc">virt_to_phys </b>(</code></td><td>volatile void * <var class="pdparam">address</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a name="idp1109452908"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>address</code></em></span></dt><dd><p> 4 address to remap 5 </p></dd></dl></div></div><div class="refsect1"><a name="idp1109454484"></a><h2>Description</h2><p> 6 The returned physical address is the physical (CPU) mapping for 7 the memory address given. It is only valid to use this function on 8 addresses directly mapped or allocated via kmalloc. 9 </p><p> 10 11 This function does not give bus mappings for DMA transfers. In 12 almost all conceivable cases a device driver should not be using 13 this function 14</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="pubfunctions.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="pubfunctions.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="API-phys-to-virt.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 5. Public Functions Provided </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span class="phrase">phys_to_virt</span></td></tr></table></div></body></html> 15