setup_arch()

Linux 6.18.37 LTS: arch/arm64/kernel/setup.c
Linux 6.18.37 LTS: arch/arm64/mm/init.c
Linux 6.18.37 LTS: arch/arm64/mm/mmu.c
Linux 6.18.37 LTS: drivers/of/fdt.c

	early_fixmap_init();
	early_fdt_ptr = fixmap_remap_fdt(dt_phys, &fdt_size, PAGE_KERNEL);
}

static void __init setup_machine_fdt(phys_addr_t dt_phys)
{
	int size;
	void *dt_virt = fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL);
	const char *name;

	if (dt_virt)
		memblock_reserve(dt_phys, size);

	if (!dt_virt || !early_init_dt_scan(dt_virt)) {
		pr_crit("\n"
			"Error: invalid device tree blob at physical address %pa (virtual address 0x%px)\n"
			"The dtb must be 8-byte aligned and must not exceed 2 MB in size\n"
			"\nPlease check your bootloader.",
			&dt_phys, dt_virt);

		/*
		 * Note that in this _really_ early stage we cannot even BUG()
		 * or oops, so the least terrible thing to do is cpu_relax(),
		 * or else we could end-up printing non-initialized data, etc.
		 */
		while (true)
			cpu_relax();
	}

	/* Early fixups are done, map the FDT as read-only now */
	fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL_RO);

	name = of_flat_dt_get_machine_name();
	if (!name)
		return;

	pr_info("Machine model: %s\n", name);
	dump_stack_set_arch_desc("%s (DT)", name);
}

			pr_warn(FW_BUG "Kernel image misaligned at boot, please fix your bootloader!");
		WARN_TAINT(mmu_enabled_at_boot, TAINT_FIRMWARE_WORKAROUND,
			   FW_BUG "Booted with MMU enabled!");
	}

	arm64_memblock_init();

	paging_init();

	acpi_table_upgrade();

	/* Parse the ACPI tables for possible boot-time configuration */
	acpi_boot_table_init();

	if (acpi_disabled)
		unflatten_device_tree();

	bootmem_init();

	kasan_init();

	request_standard_resources();

	early_ioremap_reset();

	if (acpi_disabled)
		psci_dt_init();
	else
		psci_acpi_init();

	init_bootcpu_ops();
	smp_init_cpus();
	smp_build_mpidr_hash();

	/* Init percpu seeds for random tags after cpus are set up. */
	kasan_init_sw_tags();

#ifdef CONFIG_ARM64_SW_TTBR0_PAN
	/*
	 * Make sure init_thread_info.ttbr0 always generates translation