arch/riscv/kernel/sys_hwprobe.c

File Facts

System

Linux kernel

Corpus path

arch/riscv/kernel/sys_hwprobe.c

Extension

.c

Size

16448 bytes

Lines

613

Domain

Architecture Layer

Bucket

arch/riscv

Inferred role

Architecture Layer: syscall or user/kernel boundary

Status

core 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.
• Defines or participates in a user/kernel boundary; inspect argument validation, copy_from_user/copy_to_user, credentials, and dispatch target.
• Touches user memory; correctness depends on fault-safe copying and privilege boundary handling.
• 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/syscalls.h
• linux/completion.h
• linux/atomic.h
• linux/once.h
• asm/cacheflush.h
• asm/cpufeature.h
• asm/hwprobe.h
• asm/processor.h
• asm/delay.h
• asm/sbi.h
• asm/switch_to.h
• asm/uaccess.h
• asm/unistd.h
• asm/vector.h
• asm/vendor_extensions/mips_hwprobe.h
• asm/vendor_extensions/sifive_hwprobe.h
• asm/vendor_extensions/thead_hwprobe.h
• vdso/vsyscall.h

Detected Declarations

• syscall riscv_hwprobe
• function hwprobe_arch_id
• function for_each_cpu
• function hwprobe_isa_ext0
• function hwprobe_isa_ext1
• function hwprobe_ext0_has
• function hwprobe_misaligned
• function for_each_cpu
• function hwprobe_misaligned
• function hwprobe_vec_misaligned
• function hwprobe_vec_misaligned
• function hwprobe_one_pair
• function hwprobe_get_values
• function hwprobe_get_cpus
• function for_each_cpu
• function riscv_hwprobe_register_async_probe
• function riscv_hwprobe_complete_async_probe
• function complete_hwprobe_vdso_data
• function init_hwprobe_vdso_data
• function complete_hwprobe_vdso_data
• function do_riscv_hwprobe

Annotated Snippet

SYSCALL_DEFINE5(riscv_hwprobe, struct riscv_hwprobe __user *, pairs,
		size_t, pair_count, size_t, cpusetsize, unsigned long __user *,
		cpus, unsigned int, flags)
{
	return do_riscv_hwprobe(pairs, pair_count, cpusetsize,
				cpus, flags);
}

Annotation

• Immediate include surface: `linux/syscalls.h`, `linux/completion.h`, `linux/atomic.h`, `linux/once.h`, `asm/cacheflush.h`, `asm/cpufeature.h`, `asm/hwprobe.h`, `asm/processor.h`.
• Detected declarations: `syscall riscv_hwprobe`, `function hwprobe_arch_id`, `function for_each_cpu`, `function hwprobe_isa_ext0`, `function hwprobe_isa_ext1`, `function hwprobe_ext0_has`, `function hwprobe_misaligned`, `function for_each_cpu`, `function hwprobe_misaligned`, `function hwprobe_vec_misaligned`.
• Atlas domain: Architecture Layer / arch/riscv.
• Implementation status: core implementation candidate.
• This snippet crosses the user/kernel memory boundary; validate fault handling and access checks before translating the pattern.
• 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.