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<p>Interface for memory-like address space accessible via IPC.
<a href="#details">More...</a></p>
<p><code>#include &lt;<a class="el" href="mmio__space_source.html">mmio_space</a>&gt;</code></p>
<div id="dynsection-0" onclick="return dynsection.toggleVisibility(this)" class="dynheader closed" style="cursor:pointer;"><span class="dynarrow"><span class="arrowhead closed"></span></span>Inheritance diagram for L4Re::Mmio_space:</div>
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<div id="dynsection-1" onclick="return dynsection.toggleVisibility(this)" class="dynheader closed" style="cursor:pointer;"><span class="dynarrow"><span class="arrowhead closed"></span></span>Collaboration diagram for L4Re::Mmio_space:</div>
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<div id="dynsection-1-content" class="dyncontent" style="display:none;">
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</div>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 id="header-pub-types" class="groupheader"><a id="pub-types" name="pub-types"></a>
Public Types</h2></td></tr>
<tr class="memitem:a4b7ca46b4304688a50b483eaffd42fb7" id="r_a4b7ca46b4304688a50b483eaffd42fb7"><td class="memItemLeft" align="right" valign="top">enum &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#a4b7ca46b4304688a50b483eaffd42fb7">Access_width</a> { <a class="el" href="#a4b7ca46b4304688a50b483eaffd42fb7a1f1fb483db99f182cbf5c010050dd89b">Wd_8bit</a> = 0
, <a class="el" href="#a4b7ca46b4304688a50b483eaffd42fb7a1250c3658a92c482f4c72a8894a71d61">Wd_16bit</a> = 1
, <a class="el" href="#a4b7ca46b4304688a50b483eaffd42fb7a1bcc475a11de577ac42baaca09865673">Wd_32bit</a> = 2
, <a class="el" href="#a4b7ca46b4304688a50b483eaffd42fb7a0b5599ce8761a8a388a24cc669770309">Wd_64bit</a> = 3
}</td></tr>
<tr class="memdesc:a4b7ca46b4304688a50b483eaffd42fb7"><td class="mdescLeft">&#160;</td><td class="mdescRight">Actual size of the value to read or write. <a href="#a4b7ca46b4304688a50b483eaffd42fb7">More...</a><br /></td></tr>
<tr class="memitem:a2ed4971f8ec0be1b5a542fd1f0691a01" id="r_a2ed4971f8ec0be1b5a542fd1f0691a01"><td class="memItemLeft" align="right" valign="top"><a id="a2ed4971f8ec0be1b5a542fd1f0691a01" name="a2ed4971f8ec0be1b5a542fd1f0691a01"></a>
typedef <a class="el" href="group__l4__basic__types.html#gaf3331c485014bd12a9e4f9d27a55e689">l4_uint64_t</a>&#160;</td><td class="memItemRight" valign="bottom"><b>Addr</b></td></tr>
<tr class="memdesc:a2ed4971f8ec0be1b5a542fd1f0691a01"><td class="mdescLeft">&#160;</td><td class="mdescRight">Device address. <br /></td></tr>
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<tr class="heading"><td colspan="2"><h2 id="header-pub-methods" class="groupheader"><a id="pub-methods" name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:abcd7f35633be3f71b2cf2a2162e7f0eb" id="r_abcd7f35633be3f71b2cf2a2162e7f0eb"><td class="memItemLeft" align="right" valign="top">long&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#abcd7f35633be3f71b2cf2a2162e7f0eb">mmio_read</a> (<a class="el" href="#a2ed4971f8ec0be1b5a542fd1f0691a01">Addr</a> addr, char width, <a class="el" href="group__l4__basic__types.html#gaf3331c485014bd12a9e4f9d27a55e689">l4_uint64_t</a> *value)</td></tr>
<tr class="memdesc:abcd7f35633be3f71b2cf2a2162e7f0eb"><td class="mdescLeft">&#160;</td><td class="mdescRight">Read a value from the given address. <br /></td></tr>
<tr class="memitem:a3b808dbe1e4db25b368fce4c46422640" id="r_a3b808dbe1e4db25b368fce4c46422640"><td class="memItemLeft" align="right" valign="top">long&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#a3b808dbe1e4db25b368fce4c46422640">mmio_write</a> (<a class="el" href="#a2ed4971f8ec0be1b5a542fd1f0691a01">Addr</a> addr, char width, <a class="el" href="group__l4__basic__types.html#gaf3331c485014bd12a9e4f9d27a55e689">l4_uint64_t</a> value)</td></tr>
<tr class="memdesc:a3b808dbe1e4db25b368fce4c46422640"><td class="mdescLeft">&#160;</td><td class="mdescRight">Write a value to the given address. <br /></td></tr>
<tr class="inherit_header pub_methods_classL4_1_1Kobject"><td colspan="2" onclick="javascript:dynsection.toggleInherit('pub_methods_classL4_1_1Kobject')"><span class="dynarrow"><span class="arrowhead closed"></span></span>Public Member Functions inherited from <a class="el" href="classL4_1_1Kobject.html">L4::Kobject</a></td></tr>
<tr class="memitem:a9fe009599de49f1af438ff49998faec0 inherit pub_methods_classL4_1_1Kobject" id="r_a9fe009599de49f1af438ff49998faec0"><td class="memItemLeft" align="right" valign="top"><a class="el" href="structl4__msgtag__t.html">l4_msgtag_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classL4_1_1Kobject.html#a9fe009599de49f1af438ff49998faec0">dec_refcnt</a> (<a class="el" href="group__l4__basic__types.html#ga51d9492e7700d70ed35838154ca9b279">l4_mword_t</a> diff, <a class="el" href="group__l4__utcb__api.html#ga89be8a86d11c1d532b636cc2df1330fb">l4_utcb_t</a> *utcb=<a class="el" href="group__l4__utcb__api.html#gadc099b4a59e1d99638c72c11a8c8b644">l4_utcb</a>())</td></tr>
<tr class="memdesc:a9fe009599de49f1af438ff49998faec0 inherit pub_methods_classL4_1_1Kobject"><td class="mdescLeft">&#160;</td><td class="mdescRight">Decrement the in kernel reference counter for the object. <br /></td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 id="header-inherited" class="groupheader"><a id="inherited" name="inherited"></a>
Additional Inherited Members</h2></td></tr>
<tr class="inherit_header pro_types_classL4_1_1Kobject__t"><td colspan="2" onclick="javascript:dynsection.toggleInherit('pro_types_classL4_1_1Kobject__t')"><span class="dynarrow"><span class="arrowhead closed"></span></span>Protected Types inherited from <a class="el" href="classL4_1_1Kobject__t.html">L4::Kobject_t&lt; Mmio_space, L4::Kobject, L4RE_PROTO_MMIO_SPACE &gt;</a></td></tr>
<tr class="memitem:af7df35ba5bf68ef5993e605a6b62328a inherit pro_types_classL4_1_1Kobject__t" id="r_af7df35ba5bf68ef5993e605a6b62328a"><td class="memItemLeft" align="right" valign="top">
typedef Mmio_space&#160;</td><td class="memItemRight" valign="bottom"><b>Class</b></td></tr>
<tr class="memdesc:af7df35ba5bf68ef5993e605a6b62328a inherit pro_types_classL4_1_1Kobject__t"><td class="mdescLeft">&#160;</td><td class="mdescRight">The target interface type (inheriting from <a class="el" href="classL4_1_1Kobject__t.html" title="Helper class to create an L4Re interface class that is derived from a single base class.">Kobject_t</a>). <br /></td></tr>
<tr class="memitem:a0d83157994565e9c01f10006bdda2efa inherit pro_types_classL4_1_1Kobject__t" id="r_a0d83157994565e9c01f10006bdda2efa"><td class="memItemLeft" align="right" valign="top">
typedef Typeid::Iface&lt; PROTO, Mmio_space &gt;&#160;</td><td class="memItemRight" valign="bottom"><b>__Iface</b></td></tr>
<tr class="memdesc:a0d83157994565e9c01f10006bdda2efa inherit pro_types_classL4_1_1Kobject__t"><td class="mdescLeft">&#160;</td><td class="mdescRight">The interface description for the derived class. <br /></td></tr>
<tr class="memitem:afc2feec2f4a15e85286aabfa15c53e06 inherit pro_types_classL4_1_1Kobject__t" id="r_afc2feec2f4a15e85286aabfa15c53e06"><td class="memItemLeft" align="right" valign="top">
typedef Typeid::Merge_list&lt; Typeid::Iface_list&lt; <a class="el" href="classL4_1_1Kobject__t.html#a0d83157994565e9c01f10006bdda2efa">__Iface</a> &gt;, typename L4::Kobject::__Iface_list &gt;&#160;</td><td class="memItemRight" valign="bottom"><b>__Iface_list</b></td></tr>
<tr class="memdesc:afc2feec2f4a15e85286aabfa15c53e06 inherit pro_types_classL4_1_1Kobject__t"><td class="mdescLeft">&#160;</td><td class="mdescRight">The list of all RPC interfaces provided directly or through inheritance. <br /></td></tr>
<tr class="inherit_header pro_methods_classL4_1_1Kobject__t"><td colspan="2" onclick="javascript:dynsection.toggleInherit('pro_methods_classL4_1_1Kobject__t')"><span class="dynarrow"><span class="arrowhead closed"></span></span>Protected Member Functions inherited from <a class="el" href="classL4_1_1Kobject__t.html">L4::Kobject_t&lt; Mmio_space, L4::Kobject, L4RE_PROTO_MMIO_SPACE &gt;</a></td></tr>
<tr class="memitem:a3d80fec7e057d575ec4b393437f05f8a inherit pro_methods_classL4_1_1Kobject__t" id="r_a3d80fec7e057d575ec4b393437f05f8a"><td class="memItemLeft" align="right" valign="top">
<a class="el" href="classL4_1_1Cap.html">L4::Cap</a>&lt; <a class="el" href="classL4_1_1Kobject__t.html#af7df35ba5bf68ef5993e605a6b62328a">Class</a> &gt;&#160;</td><td class="memItemRight" valign="bottom"><b>c</b> () const noexcept</td></tr>
<tr class="memdesc:a3d80fec7e057d575ec4b393437f05f8a inherit pro_methods_classL4_1_1Kobject__t"><td class="mdescLeft">&#160;</td><td class="mdescRight">Get the capability to ourselves. <br /></td></tr>
<tr class="inherit_header pro_methods_classL4_1_1Kobject"><td colspan="2" onclick="javascript:dynsection.toggleInherit('pro_methods_classL4_1_1Kobject')"><span class="dynarrow"><span class="arrowhead closed"></span></span>Protected Member Functions inherited from <a class="el" href="classL4_1_1Kobject.html">L4::Kobject</a></td></tr>
<tr class="memitem:a4f2117ae76762f4084e6a1adb915863c inherit pro_methods_classL4_1_1Kobject" id="r_a4f2117ae76762f4084e6a1adb915863c"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__l4__cap__api.html#ga1445e923ce73029130d569d6e69a4dd8">l4_cap_idx_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classL4_1_1Kobject.html#a4f2117ae76762f4084e6a1adb915863c">cap</a> () const noexcept</td></tr>
<tr class="memdesc:a4f2117ae76762f4084e6a1adb915863c inherit pro_methods_classL4_1_1Kobject"><td class="mdescLeft">&#160;</td><td class="mdescRight">Return capability selector. <br /></td></tr>
<tr class="inherit_header pro_static_methods_classL4_1_1Kobject__t"><td colspan="2" onclick="javascript:dynsection.toggleInherit('pro_static_methods_classL4_1_1Kobject__t')"><span class="dynarrow"><span class="arrowhead closed"></span></span>Static Protected Member Functions inherited from <a class="el" href="classL4_1_1Kobject__t.html">L4::Kobject_t&lt; Mmio_space, L4::Kobject, L4RE_PROTO_MMIO_SPACE &gt;</a></td></tr>
<tr class="memitem:a7433b8eed587278821dd496864f75363 inherit pro_static_methods_classL4_1_1Kobject__t" id="r_a7433b8eed587278821dd496864f75363"><td class="memItemLeft" align="right" valign="top">
static void&#160;</td><td class="memItemRight" valign="bottom"><b>__check_protocols__</b> () noexcept</td></tr>
<tr class="memdesc:a7433b8eed587278821dd496864f75363 inherit pro_static_methods_classL4_1_1Kobject__t"><td class="mdescLeft">&#160;</td><td class="mdescRight">Helper to check for protocol conflicts. <br /></td></tr>
</table>
<a name="details" id="details"></a><h2 id="header-details" class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Interface for memory-like address space accessible via IPC. </p>
<p>This interface defines methods for indirect access to MMIO regions.</p>
<p>Memory mapped IO (MMIO) is used by device drivers to control hardware devices. Access to MMIO regions is assigned to user-level device drivers via mappings of memory pages.</p>
<p>However, there are hardware platforms where MMIO regions for different devices share the same memory page. With respect to security and safety, it is often not allowed to map a memory page to multiple device drivers because the driver of one device could then influence operation of another device, which violates security boundaries.</p>
<p>A solution to that problem is to implement a third (trusted) component that gets exclusive access to the shared memory page, and that drivers can access via IPC with the <a class="el" href="structL4Re_1_1Mmio__space.html" title="Interface for memory-like address space accessible via IPC.">Mmio_space</a> protocol. This proxy-component can then enforce an access policy.</p>
<dl class="section user"><dt>Include File</dt><dd><div class="fragment"><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="mmio__space.html">l4/re/mmio_space</a>&gt;</span> </div>
<div class="ttc" id="ammio__space_html"><div class="ttname"><a href="mmio__space.html">mmio_space</a></div><div class="ttdoc">Interface definition to emit MMIO-like accesses via IPC.</div></div>
</div><!-- fragment --> </dd></dl>
<p class="definition">Definition at line <a class="el" href="mmio__space_source.html#l00045">45</a> of file <a class="el" href="mmio__space_source.html">mmio_space</a>.</p>
</div><a name="doc-enum-members" id="doc-enum-members"></a><h2 id="header-doc-enum-members" class="groupheader">Member Enumeration Documentation</h2>
<a id="a4b7ca46b4304688a50b483eaffd42fb7" name="a4b7ca46b4304688a50b483eaffd42fb7"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a4b7ca46b4304688a50b483eaffd42fb7">&#9670;&#160;</a></span>Access_width</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">enum <a class="el" href="#a4b7ca46b4304688a50b483eaffd42fb7">L4Re::Mmio_space::Access_width</a></td>
</tr>
</table>
</div><div class="memdoc">
<p>Actual size of the value to read or write. </p>
<table class="fieldtable">
<tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><a id="a4b7ca46b4304688a50b483eaffd42fb7a1f1fb483db99f182cbf5c010050dd89b" name="a4b7ca46b4304688a50b483eaffd42fb7a1f1fb483db99f182cbf5c010050dd89b"></a>Wd_8bit&#160;</td><td class="fielddoc"><p>Value is a byte. </p>
</td></tr>
<tr><td class="fieldname"><a id="a4b7ca46b4304688a50b483eaffd42fb7a1250c3658a92c482f4c72a8894a71d61" name="a4b7ca46b4304688a50b483eaffd42fb7a1250c3658a92c482f4c72a8894a71d61"></a>Wd_16bit&#160;</td><td class="fielddoc"><p>Value is a 2-byte word. </p>
</td></tr>
<tr><td class="fieldname"><a id="a4b7ca46b4304688a50b483eaffd42fb7a1bcc475a11de577ac42baaca09865673" name="a4b7ca46b4304688a50b483eaffd42fb7a1bcc475a11de577ac42baaca09865673"></a>Wd_32bit&#160;</td><td class="fielddoc"><p>Value is a 4-byte word. </p>
</td></tr>
<tr><td class="fieldname"><a id="a4b7ca46b4304688a50b483eaffd42fb7a0b5599ce8761a8a388a24cc669770309" name="a4b7ca46b4304688a50b483eaffd42fb7a0b5599ce8761a8a388a24cc669770309"></a>Wd_64bit&#160;</td><td class="fielddoc"><p>Value is a 8-byte word. </p>
</td></tr>
</table>
<p class="definition">Definition at line <a class="el" href="mmio__space_source.html#l00049">49</a> of file <a class="el" href="mmio__space_source.html">mmio_space</a>.</p>
</div>
</div>
<a name="doc-func-members" id="doc-func-members"></a><h2 id="header-doc-func-members" class="groupheader">Member Function Documentation</h2>
<a id="abcd7f35633be3f71b2cf2a2162e7f0eb" name="abcd7f35633be3f71b2cf2a2162e7f0eb"></a>
<h2 class="memtitle"><span class="permalink"><a href="#abcd7f35633be3f71b2cf2a2162e7f0eb">&#9670;&#160;</a></span>mmio_read()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">long L4Re::Mmio_space::mmio_read </td>
<td>(</td>
<td class="paramtype"><a class="el" href="#a2ed4971f8ec0be1b5a542fd1f0691a01">Addr</a></td> <td class="paramname"><span class="paramname"><em>addr</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">char</td> <td class="paramname"><span class="paramname"><em>width</em></span>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__l4__basic__types.html#gaf3331c485014bd12a9e4f9d27a55e689">l4_uint64_t</a> *</td> <td class="paramname"><span class="paramname"><em>value</em></span>&#160;)</td>
</tr>
</table>
</div><div class="memdoc">
<p>Read a value from the given address. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir"></td><td class="paramname">addr</td><td>Device virtual address to read from. The address must be aligned relative to the access width. </td></tr>
<tr><td class="paramdir"></td><td class="paramname">width</td><td>Access width of value to be read, see <a class="el" href="#a4b7ca46b4304688a50b483eaffd42fb7" title="Actual size of the value to read or write.">Access_width</a>. </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">value</td><td>Return value. If width is smaller than 64 bit,the upper bits are guaranteed to be 0.</td></tr>
</table>
</dd>
</dl>
<dl class="retval"><dt>Return values</dt><dd>
<table class="retval">
<tr><td class="paramname"><a class="el" href="group__l4__error__api.html#ggab4c8abc71ffa221a25c1ca5840a354f9aca91ea3bdb5bd82f63784ee66b489d5e" title="Ok.">L4_EOK</a></td><td>Success. </td></tr>
<tr><td class="paramname">-L4_EPERM</td><td>Insufficient read rights. </td></tr>
<tr><td class="paramname">-L4_EINVAL</td><td>Address does not exist or cannot be accessed with the given width. </td></tr>
</table>
</dd>
</dl>
<p class="reference">References <a class="el" href="#abcd7f35633be3f71b2cf2a2162e7f0eb">mmio_read()</a>.</p>
<p class="reference">Referenced by <a class="el" href="#abcd7f35633be3f71b2cf2a2162e7f0eb">mmio_read()</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a3b808dbe1e4db25b368fce4c46422640">&#9670;&#160;</a></span>mmio_write()</h2>
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<td class="memname">long L4Re::Mmio_space::mmio_write </td>
<td>(</td>
<td class="paramtype"><a class="el" href="#a2ed4971f8ec0be1b5a542fd1f0691a01">Addr</a></td> <td class="paramname"><span class="paramname"><em>addr</em></span>, </td>
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<td></td>
<td class="paramtype">char</td> <td class="paramname"><span class="paramname"><em>width</em></span>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group__l4__basic__types.html#gaf3331c485014bd12a9e4f9d27a55e689">l4_uint64_t</a></td> <td class="paramname"><span class="paramname"><em>value</em></span>&#160;)</td>
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<p>Write a value to the given address. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">addr</td><td>Device virtual address to write to. The address must be aligned relative to the access width. </td></tr>
<tr><td class="paramname">width</td><td>Access width of value to write, see <a class="el" href="#a4b7ca46b4304688a50b483eaffd42fb7" title="Actual size of the value to read or write.">Access_width</a>. </td></tr>
<tr><td class="paramname">value</td><td>Value to write. If width is smaller than 64 bit, the upper bits are ignored.</td></tr>
</table>
</dd>
</dl>
<dl class="retval"><dt>Return values</dt><dd>
<table class="retval">
<tr><td class="paramname"><a class="el" href="group__l4__error__api.html#ggab4c8abc71ffa221a25c1ca5840a354f9aca91ea3bdb5bd82f63784ee66b489d5e" title="Ok.">L4_EOK</a></td><td>Success. </td></tr>
<tr><td class="paramname">-L4_EPERM</td><td>Insufficient write rights. </td></tr>
<tr><td class="paramname">-L4_EINVAL</td><td>Address does not exist or cannot be accessed with the given width. </td></tr>
</table>
</dd>
</dl>
<p class="reference">References <a class="el" href="#a3b808dbe1e4db25b368fce4c46422640">mmio_write()</a>.</p>
<p class="reference">Referenced by <a class="el" href="#a3b808dbe1e4db25b368fce4c46422640">mmio_write()</a>.</p>
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<hr/>The documentation for this struct was generated from the following file:<ul>
<li>l4/re/<a class="el" href="mmio__space_source.html">mmio_space</a></li>
</ul>
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