What is a coprocessor?
Coprocessors are used to perform specific processing tasks, such as math coprocessors that can control digital processing to reduce the burden on the processor. ARM can support up to 16 coprocessors, of which CP15 is the most important one.
What is the function of CP15?
The system control coprocessor, CP15, provides additional registers for configuring and controlling caches, the MMU, the protection system, clock modes, and other system options such as large or small gate operation.
How to access CP15?
The access purpose is achieved through the 16 groups of registers provided by CP15.
Coprocessor access: mcr (copy or move the value of a general register to a register in the coprocessor), mrc (copy or move the value of a register in the coprocessor to a general register)
Visit example:
MCR{cond} P15, MCR{cond} P15,
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