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Philipp Oppermann
2019-03-19 13:01:25 +01:00
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blog/content/second-edition/posts/08-hardware-interrupts/index.md
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@@ -16,6 +16,8 @@ This blog is openly developed on [GitHub]. If you have any problems or questions
[at the bottom]: #comments
[post branch]: https://github.com/phil-opp/blog_os/tree/post-08
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## Overview
Interrupts provide a way to notify the CPU from attached hardware devices. So instead of letting the kernel periodically check the keyboard for new characters (a process called [_polling_]), the keyboard can notify the kernel of each keypress. This is much more efficient because the kernel only needs to act when something happened. It also allows faster reaction times, since the kernel can react immediately and not only at the next poll.