October 2017
Intermediate to advanced
586 pages
14h 8m
English
Content preview from Linux Device Drivers Development
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User space and kernel space
The concepts of kernel space and user space are a bit abstract. It is all about memory and access rights. One may consider the kernel to be privileged, whereas user apps are restricted. This is a feature of a modern CPU, allowing it to operate either in privileged or unprivileged mode. This concept will be clearer to you in Chapter 11, Kernel Memory Management:
User space and kernel space
The preceding diagram introduces the separation between kernel and user space, and highlights the fact that system calls represent a bridge between them (we discuss this later in this chapter). We can describe each space as follows: ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.