September 2017
Beginner to intermediate
290 pages
6h 58m
English
Content preview from Mastering Assembly Programming
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Control registers
Processors based on the Intel architecture have a set of control registers that are used for configuration of the processor at run time (such as switching between execution modes). These registers are 32-bit wide on x86 and 64-bit wide on AMD64 (long mode).
There are six control registers and one Extended Feature Enable Register (EFER):
- CR0: This register contains various control flags that modify the basic operation of the processor.
- CR1: This register is reserved for future use.
- CR2: This register contains the Page Fault Linear Address when a page fault occurs.
- CR3: This register is used when virtual addressing is enabled (paging) and contains the physical address of the page directory, page directory pointer table, or ...
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