132 lines
6.0 KiB
HTML
132 lines
6.0 KiB
HTML
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<div class="headertitle"><div class="title">Sigma0, the Root-Pager </div></div>
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<div class="textblock"><p>Sigma0 is a special <a class="el" href="namespaceL4.html" title="L4 low-level kernel interface.">L4</a> server that serves as the origin for mapping memory. It is started by Fiasco.OC on the system boot and gets full access to all userland RAM and device memory. It functions as the pager (main memory provider) for Moe and as the provider for device memory for Io. Moe and Io are trusted and usually the only applications besides Ned that get a capability for Sigma0. Memory can be requested from Sigma0 directly via an IPC, or indirectly by causing page faults and having them resolved by Sigma0.</p>
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<h1 class="doxsection"><a class="anchor" id="Factory"></a>
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Factory</h1>
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<p>There is only one instance of Sigma0 in an <a class="el" href="namespaceL4Re.html" title="L4Re C++ Interfaces.">L4Re</a> system, which is made accessible to Moe via an IPC gate capability. Using this capability, Moe can request Sigma0 to create new communication channels to itself by creating additional IPC gate capabilities. This request is done using the <a class="el" href="classL4_1_1Factory.html" title="C++ Factory interface, see Factory for the C interface.">L4::Factory</a> interface. This is the only kind of object that can be created by the factory in Sigma0.</p>
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<p>List of objects that the Sigma0 Factory can create:</p>
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<ul>
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<li>Sigma0 ()<ul>
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<li>Use protocol id <a class="el" href="group__l4__msgtag__api.html#gga9ac8443c5696208bb0539dd659ea1c92a8f520d989dbd79fc77af6f1940ee478b" title="Sigma0 protocol.">L4_PROTO_SIGMA0</a> for creation</li>
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<li>No arguments supported</li>
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</ul>
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</li>
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</ul>
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<dl class="section see"><dt>See also</dt><dd><a class="el" href="group__l4sigma0__api.html" title="Sigma0 API bindings.">Sigma0 API</a> </dd></dl>
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