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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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593 lines
36 KiB
HTML
593 lines
36 KiB
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<meta name="description" content="The perfect emulation setup to study and develop the <<linux-kernel>> v5.9.2, kernel modules, <<qemu-buildroot-setup,QEMU>>, <<gem5-buildroot-setup,gem5>> and x86_64, ARMv7 and ARMv8 <<userland-assembly,userland>> and <<baremetal-setup,baremetal>> assembly, <<c,ANSI C>>, <<cpp,C++>> and <<posix,POSIX>>. EVERYTHING is built from source. <<gdb>> and <<kgdb>> just work. Powered by <<about-the-qemu-buildroot-setup,Buildroot>> and <<about-the-baremetal-setup,crosstool-NG>>. Highly automated. Thoroughly documented. Automated <<test-this-repo,tests>>. "Tested" in an Ubuntu 20.04 host.">
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<title>Linux Kernel Module Cheat</title>
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|
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</head>
|
||
<body id="gem5-graphic-mode" class="article">
|
||
<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect2">
|
||
<h3 id="gem5-graphic-mode"><a class="anchor" href="#gem5-graphic-mode"></a><a class="link" href="#gem5-graphic-mode">14.3. gem5 graphic mode</a></h3>
|
||
<div class="paragraph">
|
||
<p>gem5 does not have a "text mode", since it cannot redirect the Linux terminal to same host terminal where the executable is running: you are always forced to connect to the terminal with <code>gem-shell</code>.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>TODO could not get it working on <code>x86_64</code>, only ARM.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Overview: <a href="https://stackoverflow.com/questions/50364863/how-to-get-graphical-gui-output-and-user-touch-keyboard-mouse-input-in-a-ful/50364864#50364864" class="bare">https://stackoverflow.com/questions/50364863/how-to-get-graphical-gui-output-and-user-touch-keyboard-mouse-input-in-a-ful/50364864#50364864</a></p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>More concretely, first build the kernel with the <a href="gem5-arm-linux-kernel-patches.html">gem5 arm Linux kernel patches</a>, and then run:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./build-linux \
|
||
--arch arm \
|
||
--custom-config-file-gem5 \
|
||
--linux-build-id gem5-v4.15 \
|
||
;
|
||
./run --arch arm --emulator gem5 --linux-build-id gem5-v4.15</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>and then on another shell:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>vinagre localhost:5900</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The <a href="config-logo.html">CONFIG_LOGO</a> penguin only appears after several seconds, together with kernel messages of type:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>[ 0.152755] [drm] found ARM HDLCD version r0p0
|
||
[ 0.152790] hdlcd 2b000000.hdlcd: bound virt-encoder (ops 0x80935f94)
|
||
[ 0.152795] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
|
||
[ 0.152799] [drm] No driver support for vblank timestamp query.
|
||
[ 0.215179] Console: switching to colour frame buffer device 240x67
|
||
[ 0.230389] hdlcd 2b000000.hdlcd: fb0: frame buffer device
|
||
[ 0.230509] [drm] Initialized hdlcd 1.0.0 20151021 for 2b000000.hdlcd on minor 0</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The port <code>5900</code> is incremented by one if you already have something running on that port, <code>gem5</code> stdout tells us the right port on stdout as:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>system.vncserver: Listening for connections on port 5900</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>and when we connect it shows a message:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>info: VNC client attached</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Alternatively, you can also dump each new frame to an image file with <code>--frame-capture</code>:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./run \
|
||
--arch arm \
|
||
--emulator gem5 \
|
||
--linux-build-id gem5-v4.15 \
|
||
-- --frame-capture \
|
||
;</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>This creates on compressed PNG whenever the screen image changes inside the <a href="m5out-directory.html">m5out directory</a> with filename of type:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>frames_system.vncserver/fb.<frame-index>.<timestamp>.png.gz</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>It is fun to see how we get one new frame whenever the white underscore cursor appears and reappears under the penguin!</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The last frame is always available uncompressed at: <code>system.framebuffer.png</code>.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>TODO <a href="kmscube.html">kmscube</a> failed on <code>aarch64</code> with:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>kmscube[706]: unhandled level 2 translation fault (11) at 0x00000000, esr 0x92000006, in libgbm.so.1.0.0[7fbf6a6000+e000]</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Tested on: <a href="https://github.com/cirosantilli/linux-kernel-module-cheat/commit/38fd6153d965ba20145f53dc1bb3ba34b336bde9">38fd6153d965ba20145f53dc1bb3ba34b336bde9</a></p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p><a href="graphic-mode-gem5-aarch64.html">Graphic mode gem5 aarch64</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="gem5-graphic-mode-dp650.html">gem5 graphic mode DP650</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="gem5-graphic-mode-internals.html">gem5 graphic mode internals</a></p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph nav-footer">
|
||
<p>← Previous: <a href="qemu-graphic-mode-arm-vga.html">QEMU graphic mode arm VGA</a> | ↑ Up: <a href="graphics.html">Graphics</a> | ⌂ Home: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="graphic-mode-gem5-aarch64.html">Graphic mode gem5 aarch64</a> →</p>
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