linux-kernel-driver-dev/kboot1.html at master · txrxlabs/linux-kernel-driver-dev · GitHub

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<html>
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<title>Kernel Booting</title>
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<p align=center><font size=+5>Kernel Booting</font>
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<a href="contents.html">Contents</a>
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<p><font face="monospace">start_kernel()</font> in
<font face="monospace">init/main.c</font> is
the entry point into the booting
kernel.  Eventually, after initializing a bunch of stuff, at the end
of start_kernel, after transforming into the hand-crafted init process,
<font face="monospace">rest_init()</font> is called.

<p><font face="monospace">rest_init()</font> starts the
<font face="monospace">kernel_init</font> thread and
<font face="monospace">kthreadd</font> -- which is a thread that is used to
start new threads.  <font face="monospace">kernel_init()</font>
tries to execute an init program via a series of calls to <font face="monospace">run_init_process</font>,
which relies on <font face="monospace">do_execve (in fs/exec.c)</font> to do the execution.
It will attempt to execute
<font face="monospace">/sbin/init, /etc/init, /bin/init,</font> or
<font face="monospace">/bin/sh</font>, in that order.
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