Probably not what you are looking for, but I can wholeheartedly recommend "Modern Operating Systems" by Andrew Tanenbaum. Yes, it is a whole book, and it goes to quite a level of detail, as you can imagine, but it is written really nicely and engaging.
If you don't want the full level of detail, just skip certain parts! You will still learn a lot. I know many people are reluctant to "read a book" and then skip 80% of it, but it is a really great technique for non-fiction.
