The ARM MMU allows two different ways to perform a context switch between applications, using either register 2 (page directory base address) or register 3 (domain access permissions) of the ARM system control coprocessor CP15. Describe how these two methods work. What are the advantages or disadvantages of each method?

20 19 31 virtual address table index section index 31 14 13 CP15 register 2 page directory base address 31 14 13 2 10 table index page directory base address 00 12 11 10 9 8 00000000 AP 0 domain ? CB 10 5 4 3 2 1 0 20 19 31 memory section base address access 31 20 19 section base address physical address section index 31 y data access