arch/arm64/kernel/setup.c

File Facts

System

Linux kernel

Corpus path

arch/arm64/kernel/setup.c

Extension

.c

Size

11569 bytes

Lines

437

Domain

Architecture Layer

Bucket

arch/arm64

Inferred role

Architecture Layer: exported/initcall integration point

Status

integration implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

• CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/acpi.h
• linux/export.h
• linux/kernel.h
• linux/stddef.h
• linux/ioport.h
• linux/delay.h
• linux/initrd.h
• linux/console.h
• linux/cache.h
• linux/screen_info.h
• linux/init.h
• linux/kexec.h
• linux/root_dev.h
• linux/cpu.h
• linux/interrupt.h
• linux/smp.h
• linux/fs.h
• linux/panic_notifier.h
• linux/proc_fs.h
• linux/memblock.h
• linux/of_fdt.h
• linux/efi.h
• linux/psci.h
• linux/sched/task.h
• linux/scs.h
• linux/mm.h
• asm/acpi.h
• asm/fixmap.h
• asm/cpu.h
• asm/cputype.h
• asm/daifflags.h
• asm/elf.h

Detected Declarations

• function smp_setup_processor_id
• function arch_match_cpu_phys_id
• function smp_build_mpidr_hash
• function setup_machine_fdt
• function request_standard_resources
• function for_each_mem_region
• function reserve_memblock_reserved_regions
• function for_each_reserved_mem_range
• function cpu_logical_map
• function setup_arch
• function cpu_can_disable
• function arch_cpu_is_hotpluggable
• function dump_kernel_offset
• function arm64_panic_block_dump
• function register_arm64_panic_block
• function check_mmu_enabled_at_boot
• module init register_arm64_panic_block

Annotated Snippet

device_initcall(register_arm64_panic_block);

static int __init check_mmu_enabled_at_boot(void)
{
	if (!efi_enabled(EFI_BOOT) && mmu_enabled_at_boot)
		panic("Non-EFI boot detected with MMU and caches enabled");
	return 0;
}
device_initcall_sync(check_mmu_enabled_at_boot);

Annotation

• Immediate include surface: `linux/acpi.h`, `linux/export.h`, `linux/kernel.h`, `linux/stddef.h`, `linux/ioport.h`, `linux/delay.h`, `linux/initrd.h`, `linux/console.h`.
• Detected declarations: `function smp_setup_processor_id`, `function arch_match_cpu_phys_id`, `function smp_build_mpidr_hash`, `function setup_machine_fdt`, `function request_standard_resources`, `function for_each_mem_region`, `function reserve_memblock_reserved_regions`, `function for_each_reserved_mem_range`, `function cpu_logical_map`, `function setup_arch`.
• Atlas domain: Architecture Layer / arch/arm64.
• Implementation status: integration implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.