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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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575 lines
36 KiB
HTML
575 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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</head>
|
||
<body id="gem5-arm-linux-kernel-patches" class="article">
|
||
<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect2">
|
||
<h3 id="gem5-arm-linux-kernel-patches"><a class="anchor" href="#gem5-arm-linux-kernel-patches"></a><a class="link" href="#gem5-arm-linux-kernel-patches">24.9. gem5 arm Linux kernel patches</a></h3>
|
||
<div class="paragraph">
|
||
<p><a href="https://gem5.googlesource.com/arm/linux/" class="bare">https://gem5.googlesource.com/arm/linux/</a> contains an ARM Linux kernel forks with a few gem5 specific Linux kernel patches on top of mainline created by ARM Holdings on top of a few upstream kernel releases.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Our <a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/build">build</a> script automatically adds that remote for us as <code>gem5-arm</code>.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The patches are optional: the vanilla kernel does boot. But they add some interesting gem5-specific optimizations, instrumentations and device support.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The patches also <a href="notable-alternate-gem5-kernel-configs.html">add defconfigs</a> that are known to work well with gem5.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>E.g. for arm v4.9 there is: <a href="https://gem5.googlesource.com/arm/linux/+/917e007a4150d26a0aa95e4f5353ba72753669c7/arch/arm/configs/gem5_defconfig" class="bare">https://gem5.googlesource.com/arm/linux/+/917e007a4150d26a0aa95e4f5353ba72753669c7/arch/arm/configs/gem5_defconfig</a>.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>In order to use those patches and their associated configs, and, we recommend using <a href="linux-kernel-build-variants.html">Linux kernel build variants</a> as:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>git -C "$(./getvar linux_source_dir)" fetch gem5-arm:gem5/v4.15
|
||
git -C "$(./getvar linux_source_dir)" checkout gem5/v4.15
|
||
./build-linux \
|
||
--arch aarch64 \
|
||
--custom-config-file-gem5 \
|
||
--linux-build-id gem5-v4.15 \
|
||
;
|
||
git -C "$(./getvar linux_source_dir)" checkout -
|
||
./run \
|
||
--arch aarch64 \
|
||
--emulator gem5 \
|
||
--linux-build-id gem5-v4.15 \
|
||
;</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>QEMU also boots that kernel successfully:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./run \
|
||
--arch aarch64 \
|
||
--linux-build-id gem5-v4.15 \
|
||
;</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>but glibc kernel version checks make init fail with:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>FATAL: kernel too old</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>because glibc was built to expect a newer Linux kernel as shown at: <a href="fatal-kernel-too-old-failure-in-userland-simulation.html">Section 11.4.1, “FATAL: kernel too old failure in userland simulation”</a>. Your choices to solve this are:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p>see if there is a more recent gem5 kernel available, or port your patch of interest to the newest kernel</p>
|
||
</li>
|
||
<li>
|
||
<p>modify this repo to use <a href="libc-choice.html">uClibc</a>, which is not hard because of Buildroot</p>
|
||
</li>
|
||
<li>
|
||
<p>patch glibc to remove that check, which is easy because glibc is in a submodule of this repo</p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>It is obviously not possible to understand what the Linux kernel fork commits actually do from their commit message, so let’s explain them one by one here as we understand them:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p><code>drm: Add component-aware simple encoder</code> allows you to see images through VNC, see: <a href="gem5-graphic-mode.html">Section 14.3, “gem5 graphic mode”</a></p>
|
||
</li>
|
||
<li>
|
||
<p><code>gem5: Add support for gem5’s extended GIC mode</code> adds support for more than 8 cores, see: <a href="gem5-arm-full-system-with-more-than-8-cores.html">Section 24.3.1.2, “gem5 ARM full system with more than 8 cores”</a></p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Tested on 649d06d6758cefd080d04dc47fd6a5a26a620874 + 1.</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p><a href="gem5-arm-linux-kernel-patches-boot-speedup.html">gem5 arm Linux kernel patches boot speedup</a></p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph nav-footer">
|
||
<p>← Previous: <a href="m5op-annotations.html">m5op annotations</a> | ↑ Up: <a href="gem5.html">gem5</a> | ⌂ Home: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="gem5-arm-linux-kernel-patches-boot-speedup.html">gem5 arm Linux kernel patches boot speedup</a> →</p>
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