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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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554 lines
34 KiB
HTML
554 lines
34 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>>. <<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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|
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|
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|
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|
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.nav-footer > p > a {white-space: nowrap;}</style>
|
||
</head>
|
||
<body id="qemu-graphic-mode" class="article">
|
||
<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect2">
|
||
<h3 id="qemu-graphic-mode"><a class="anchor" href="#qemu-graphic-mode"></a><a class="link" href="#qemu-graphic-mode">14.2. QEMU graphic mode</a></h3>
|
||
<div class="paragraph">
|
||
<p>Enable graphic mode with:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./run --graphic</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Outcome: you see a penguin due to <a href="config-logo.html">CONFIG_LOGO</a>.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>For a more exciting GUI experience, see: <a href="x11.html">Section 14.4, “X11 Buildroot”</a></p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Text mode is the default due to the following considerable advantages:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p>copy and paste commands and stdout output to / from host</p>
|
||
</li>
|
||
<li>
|
||
<p>get full panic traces when you start making the kernel crash :-) See also: <a href="https://unix.stackexchange.com/questions/208260/how-to-scroll-up-after-a-kernel-panic" class="bare">https://unix.stackexchange.com/questions/208260/how-to-scroll-up-after-a-kernel-panic</a></p>
|
||
</li>
|
||
<li>
|
||
<p>have a large scroll buffer, and be able to search it, e.g. by using tmux on host</p>
|
||
</li>
|
||
<li>
|
||
<p>one less window floating around to think about in addition to your shell :-)</p>
|
||
</li>
|
||
<li>
|
||
<p>graphics mode has only been properly tested on <code>x86_64</code>.</p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Text mode has the following limitations over graphics mode:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p>you can’t see graphics such as those produced by <a href="x11.html">X11 Buildroot</a></p>
|
||
</li>
|
||
<li>
|
||
<p>very early kernel messages such as <code>early console in extract_kernel</code> only show on the GUI, since at such early stages, not even the serial has been setup.</p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p><code>x86_64</code> has a VGA device enabled by default, as can be seen as:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./qemu-monitor info qtree</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>and the Linux kernel picks it up through the <a href="https://en.wikipedia.org/wiki/Linux_framebuffer">fbdev</a> graphics system as can be seen from:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>cat /dev/urandom > /dev/fb0</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>flooding the screen with colors. See also: <a href="https://superuser.com/questions/223094/how-do-i-know-if-i-have-kms-enabled" class="bare">https://superuser.com/questions/223094/how-do-i-know-if-i-have-kms-enabled</a></p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p><a href="scroll-up-in-graphic-mode.html">Scroll up in graphic mode</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="qemu-graphic-mode-arm.html">QEMU Graphic mode arm</a></p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph nav-footer">
|
||
<p>← Previous: <a href="quit-qemu-from-text-mode.html">Quit QEMU from text mode</a> | ↑ Up: <a href="graphics.html">Graphics</a> | ⌂ Home: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="scroll-up-in-graphic-mode.html">Scroll up in graphic mode</a> →</p>
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