September 2017
Beginner to intermediate
290 pages
6h 58m
English
Content preview from Mastering Assembly Programming
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Processor registers
Each programmable device, and Intel processors are not an exception, has a set of general purpose registers--memory cells located physically on the die, thus providing low latency access. They are used for temporary storage of data that a processor operates on or data that is frequently accessed (if the amount of general purpose registers allows this). The amount and bit size of registers on an Intel CPU vary in accordance with the current mode of operation. An Intel CPU has at least two modes:
- Real mode: This is the good old DOS mode. When the processor is powered up, it starts in the real mode, which has certain limitations, such as the size of the address bus, which is only 20 bits, and the segmented memory space. ...
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