October 2017
Intermediate to advanced
354 pages
9h 28m
English
Content preview from Mastering Linux Kernel Development
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Initialization operations
In most architectures, on reset, processor is initialized in normal or physical address mode (also called real mode in x86) and begins executing the platform's firmware instructions found at the reset vector. These firmware instructions (which can be single binary or multi-stage binary) are programmed to carry out various operations, which include initialization of the memory controller, calibration of physical RAM, and loading the binary kernel image into a specific region of physical memory, among others.
When in real mode, processors do not support virtual addressing, and Linux, which is designed and implemented for systems with protected mode, requires virtual addressing to enable process protection and isolation, ...
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