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How does Linux kernel detect and plug in your hardware?

Nov 18, 2011, 10:00 (1 Talkback[s])


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"Everything starts with at the Kernel. Operating systems are using Privilege Rings.

These rings are created by CPU and not by OS. Any OS kernel operates in Ring 0 which is most privileged level and can comunicate directly to the hardware and the CPU. Rings 1 and 2 are commonly used for device drivers. And ring 3 is used for user-space applications (media players, web servers and anything else user can communicate to directly). Device drivers are a „bridge" between user-space applications and hardware. You should note that in Linux rings 1 and 2 are NOT used (at least this is what I found out…), because Linux drivers are compilled directly into kernel or as a dynamic kernel modules (in both cases drivers appear in at a Ring 0).

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