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<div class="headertitle"><div class="title">uvmm_dtg The device tree generator for Uvmm </div></div>
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<div class="textblock"><p><a class="anchor" id="md_pkg_2uvmm_2doc_2uvmm__dtg"></a></p>
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<p>A virtual machine in Uvmm is configured with a device tree that contains information about the VMs resources, memory layout, virtual CPUs and peripheral devices.</p>
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<p>Uvmm_dtg is a tool to generate such a device tree at runtime according to its command line.</p>
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<h1>Usage in <a class="el" href="namespaceL4Re.html" title="L4Re C++ Interfaces.">L4Re</a></h1>
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<p>Example lua script for Ned: </p><pre class="fragment">-- Create DS holding device tree
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local dt = L4.Env.user_factory:create(L4.Proto.Dataspace, 4 * 1024):m("rw");
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-- Start the generator
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L4.default_loader:start(
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{
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caps = { dt = dt },
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}, "rom/uvmm_dtg dt"):wait();
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-- Start uvmm
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vmm.start_vm
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{
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...
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ext_caps = { dt = dt },
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fdt = "dt",
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...
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}
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</pre><p>Please notice the <span class="tt">:wait()</span> when starting <span class="tt">uvmm_dtg</span>. This makes Ned pause until uvmm_dtg has exited and put the device tree into the dataspace such that Uvmm can commence.</p>
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<h1>Usage</h1>
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<p><span class="tt">uvmm_dtg [OPTION]... <file>|--</span></p>
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<ul>
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<li><span class="tt">--</span> print to stdout</li>
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<li><p class="startli"><span class="tt">file</span></p>
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<p class="startli">On <a class="el" href="namespaceL4Re.html" title="L4Re C++ Interfaces.">L4Re</a>, the string given as <span class="tt"><file></span> is interpreted as a named capability which needs to be backed by a sufficiently large Dataspace. On Linux, a file with the given name is created. In both cases, uvmm_dtg will output into the named file.</p>
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</li>
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</ul>
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<h2>Options</h2>
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<ul>
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<li><p class="startli"><span class="tt">-h</span></p>
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<p class="startli">Show help.</p>
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</li>
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<li><p class="startli"><span class="tt">--arch <target architecture></span></p>
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<p class="startli">Select the target architecture. Valid options are <span class="tt">x86</span>, <span class="tt">x86_64</span>, <span class="tt">arm32</span>, <span class="tt">arm64</span>, <span class="tt">mips32</span> and <span class="tt">mips64</span>.</p>
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</li>
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<li><p class="startli"><span class="tt">--format <format></span></p>
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<p class="startli">Select the output format. Available formats are: <span class="tt">txt</span>: The device tree will be printed as plain text (<span class="tt">dts</span>). <span class="tt">bin</span>: The device tree will be output as binary (<span class="tt">dtb</span>).</p>
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</li>
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<li><p class="startli"><span class="tt">--mem-base <membase></span></p>
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<p class="startli">Configure the start of the memory distribution. <span class="tt">membase</span> can be defined in both decimal and hex notations. uvmm_dtg rounds the given base up to the platforms page size.</p>
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<p class="startli">This value can be overridden by memory devices with fixed addresses.</p>
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</li>
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<li><p class="startli"><span class="tt">--device <devicename:[Option1,Option2=value,Option3=value,...]></span></p>
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<p class="startli">This configures a device.</p>
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<p class="startli">To get a list of supported devices, use <span class="tt">--device help</span>.</p>
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<p class="startli">To get help for a specific device, use <span class="tt">--device devicename:help</span>. </p>
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</li>
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</ul>
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