December 2011
Intermediate to advanced
485 pages
15h 47m
English
Content preview from OS X and iOS Kernel ProgrammingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Memory Descriptors
Memory descriptors are implemented by the IOMemoryDescriptor class and is fundamental to working with memory in I/O Kit. The class also serves as a super class for other important memory-related classes, which we will discuss later in this chapter. Many parts of the I/O Kit accept an IOMemoryDescriptor as an argument. For example, the USB family uses the class to describe memory used for USB read and write requests.
The IOMemoryDescriptor describes the properties of a memory buffer or range of memory, but does not allocate (or free) the described memory. It contains metadata and allows some operations to be performed on the memory. It can describe virtual and physical memory. The class is versatile and can be used for a number ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.