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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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536 lines
35 KiB
HTML
536 lines
35 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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</head>
|
||
<body id="nienfengyaoarmv8-bare-metal" class="article">
|
||
<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect4">
|
||
<h5 id="nienfengyaoarmv8-bare-metal"><a class="anchor" href="#nienfengyaoarmv8-bare-metal"></a><a class="link" href="#nienfengyaoarmv8-bare-metal">33.10.7.1. NienfengYao/armv8-bare-metal</a></h5>
|
||
<div class="paragraph">
|
||
<p><a href="https://github.com/NienfengYao/armv8-bare-metal" class="bare">https://github.com/NienfengYao/armv8-bare-metal</a></p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The only QEMU <code>-m virt</code> aarch64 example set that I can find on the web. Awesome.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>A large part of the code is taken from the awesome educational OS under 2-clause BSD as can be seen from file headers: <a href="https://github.com/takeharukato/sample-tsk-sw/tree/ce7973aa5d46c9eedb58309de43df3b09d4f8d8d/hal/aarch64" class="bare">https://github.com/takeharukato/sample-tsk-sw/tree/ce7973aa5d46c9eedb58309de43df3b09d4f8d8d/hal/aarch64</a> but Nienfeng largely minimized it.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>I needed the following minor patches: <a href="https://github.com/NienfengYao/armv8-bare-metal/pull/1" class="bare">https://github.com/NienfengYao/armv8-bare-metal/pull/1</a></p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Handles an SVC and setups and handles the timer about once per second.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The source claims GICv3, however if I try to add <code>-machine gic_version=3</code> on their command line with our QEMU v4.0.0, then it blows up at:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>static void init_gicc(void)
|
||
{
|
||
uint32_t pending_irq;
|
||
|
||
/* Disable CPU interface */
|
||
*REG_GIC_GICC_CTLR = GICC_CTLR_DISABLE;</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>which tries to write to 0x8010000 according to GDB.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Without <code>-machine</code>, QEMU’s DTB clearly states GICv2, so I’m starting to wonder if Nienfeng just made a mistake there? The QEMU GICv3 DTB contains:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>reg = <0x0 0x8000000 0x0 0x10000 0x0 0x80a0000 0x0 0xf60000>;</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>and the GICv2 one:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>reg = <0x0 0x8000000 0x0 0x10000 0x0 0x8010000 0x0 0x10000>;</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>which further confirms that the exception is correct: v2 has a register range at 0x8010000 while in v3 it moved to 0x80a0000 and 0x8010000 is empty.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The original source does not mention GICv3 anywhere, only <a href="https://github.com/takeharukato/sample-tsk-sw/blob/c7bbc9dce6b14660bcce8d20735f8c6ebb09396b/hal/aarch64/gic-pl390.c">pl390</a>, which is a specific GIC model that predates the GICv2 spec I believe.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>TODO if I hack <code>#define GIC_GICC_BASE (GIC_BASE + 0xa0000)</code>, then it goes a bit further, but the next loop never ends.</p>
|
||
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