1<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>region_intersects</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="The Linux Kernel API"><link rel="up" href="ch09s03.html" title="Resources Management"><link rel="prev" href="API-request-resource-conflict.html" title="request_resource_conflict"><link rel="next" href="API-reallocate-resource.html" title="reallocate_resource"></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">region_intersects</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-request-resource-conflict.html">Prev</a> </td><th width="60%" align="center">Resources Management</th><td width="20%" align="right"> <a accesskey="n" href="API-reallocate-resource.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-region-intersects"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>region_intersects — 
2     determine intersection of region with known resources
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">int <b class="fsfunc">region_intersects </b>(</code></td><td>resource_size_t <var class="pdparam">start</var>, </td></tr><tr><td> </td><td>size_t <var class="pdparam">size</var>, </td></tr><tr><td> </td><td>const char * <var class="pdparam">name</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a name="id-1.11.4.3.5"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>start</code></em></span></dt><dd><p>
4     region start address
5    </p></dd><dt><span class="term"><em class="parameter"><code>size</code></em></span></dt><dd><p>
6     size of region
7    </p></dd><dt><span class="term"><em class="parameter"><code>name</code></em></span></dt><dd><p>
8     name of resource (in iomem_resource)
9    </p></dd></dl></div></div><div class="refsect1"><a name="id-1.11.4.3.6"></a><h2>Description</h2><p>
10   Check if the specified region partially overlaps or fully eclipses a
11   resource identified by <em class="parameter"><code>name</code></em>.  Return REGION_DISJOINT if the region
12   does not overlap <em class="parameter"><code>name</code></em>, return REGION_MIXED if the region overlaps
13   <em class="parameter"><code>type</code></em> and another resource, and return REGION_INTERSECTS if the
14   region overlaps <em class="parameter"><code>type</code></em> and no other defined resource. Note, that
15   REGION_INTERSECTS is also returned in the case when the specified
16   region overlaps RAM and undefined memory holes.
17   </p><p>
18
19   <code class="function">region_intersect</code> is used by memory remapping functions to ensure
20   the user is not remapping RAM and is a vast speed up over walking
21   through the resource table page by page.
22</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-request-resource-conflict.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch09s03.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="API-reallocate-resource.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">request_resource_conflict</span> </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">reallocate_resource</span></td></tr></table></div></body></html>
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