June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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The role of device drivers
As I mentioned in Chapter 4, Configuring and Building the Kernel, one of the functions of the kernel is to encapsulate the many hardware interfaces of a computer system and present them in a consistent manner to user space programs. The kernel has frameworks designed to make it easy to write a device driver, which is the piece of code that mediates between the kernel above and the hardware below. A device driver maybe written to control physical devices such as a UART or an MMC controller, or it may represent a virtual device such as the null device (/dev/null) or a ramdisk. One driver may control multiple devices of the same kind.
Kernel device driver code runs at a high privilege level, as does the rest of the ...
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