TEE-- Linux Kernel Implementation Appreciation

The eighth working mode of Arm,

Why does Monitor mode introduce this working mode?

Why? here
http://infocenter.arm.com/help/topic/com.arm.doc.prd29-genc-009492c/PRD29-GENC-009492C_trustzone_security_whitepaper.pdf

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Looking at the above diagram, there is a bit of an analogy between User space and Kernel space.

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