ARM64 Kernel Booting Process

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1. boot loader requirements to boot Kernel
2. ARM64 Virtual Memory Layout
3. ARM64 IRQ Vectors Setup
4. FDT Mapping
5. ARM64 Kernel booting process

       5.1 Prior to start_kernel

             5.1.1__create_page_tables

             5.1.2 __cpu_setup

             5.1.3 __primary_switch

      5.2 Start_kernel

            5.2.1 Start_kernel -> setup_arch

                    5.2.1.1 Start_kernel -> setup_arch -> setup_machine_fdt

                    5.2.1.2 Start_kernel -> setup_arch -> paging_init / bootmem_init

                    5.2.1.3 Start_kernel -> setup_arch -> psci_init

            5.2.2 Start_kernel -> Rest_init

                     5.2.2.1 Start_kernel -> Rest_init -> kernel_init