tools/testing/selftests/arm64/signal/sve_helpers.h

File Facts

System

Linux kernel

Corpus path

tools/testing/selftests/arm64/signal/sve_helpers.h

Extension

.h

Size

521 bytes

Lines

35

Domain

Support Tooling And Documentation

Bucket

tools

Inferred role

Support Tooling And Documentation: implementation source

Status

source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

• Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

• stdbool.h

Detected Declarations

• function get_svcr

Annotated Snippet

#ifndef __SVE_HELPERS_H__
#define __SVE_HELPERS_H__

#include <stdbool.h>

#define VLS_USE_SVE	false
#define VLS_USE_SME	true

extern unsigned int vls[];
extern unsigned int nvls;

int sve_fill_vls(bool use_sme, int min_vls);

static inline uint64_t get_svcr(void)
{
	uint64_t val;

	asm volatile (
		"mrs	%0, S3_3_C4_C2_2\n"
		: "=r"(val)
		:
		: "cc");

	return val;
}

#endif

Annotation

• Immediate include surface: `stdbool.h`.
• Detected declarations: `function get_svcr`.
• Atlas domain: Support Tooling And Documentation / tools.
• Implementation status: source implementation candidate.

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.