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    <p>I would recommend looking at <a href="http://lxr.linux.no/linux" rel="noreferrer">LXR</a>. It makes it easier to follow the flow of the code (you do not have to search for each function that is called &mdash; well, you have, but the site does it for you).</p> <p>Some starting points, for the current version (2.6.30):</p> <ul> <li><a href="http://lxr.linux.no/linux+v2.6.30/init/main.c#L536" rel="noreferrer"><code>start_kernel()</code></a> &mdash; think of it as the kernel equivalent of <code>main()</code>. This function initializes almost all the kernel subsystems; follow it to see in code what you see scrolling on the screen during the boot.</li> <li><a href="http://lxr.linux.no/linux+v2.6.30/arch/x86/kernel/entry_32.S" rel="noreferrer">entry_32.S</a> &mdash; system calls and interrupts (x86-32 version, which should be nearer what you know; note the use of the AT&amp;T assembly dialect instead of the Intel dialect you might be more used to).</li> <li><a href="http://lxr.linux.no/linux+v2.6.30/arch/x86/kernel/head_32.S" rel="noreferrer">head_32.S</a> &mdash; the kernel entry point. This is where the kernel starts after switching to protected mode; in the end, it will call <code>start_kernel()</code>.</li> <li><a href="http://lxr.linux.no/linux+v2.6.30/arch/x86/boot/" rel="noreferrer">arch/x86/boot</a> &mdash; the real-mode bootstrap code. It starts in assembly (<a href="http://lxr.linux.no/linux+v2.6.30/arch/x86/boot/header.S" rel="noreferrer">boot/header.S</a>), but quickly jumps into C code (starting at <a href="http://lxr.linux.no/linux+v2.6.30/arch/x86/boot/main.c" rel="noreferrer">boot/main.c</a>). Does the real-mode initialization (mostly BIOS calls which have to be done before switching to protected mode); it is compiled using a weird GCC trick (<code>.code16gcc</code>), which allows the generation of 32-bit real-mode code.</li> <li><a href="http://lxr.linux.no/linux+v2.6.30/arch/x86/boot/compressed/" rel="noreferrer">arch/x86/boot/compressed</a> &mdash; if you ever wondered where does the "Decompressing Linux..." message comes from, it is from here.</li> </ul>
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