arch/openrisc/include/asm/bitops/ffs.h

File Facts

System

Linux kernel

Corpus path

arch/openrisc/include/asm/bitops/ffs.h

Extension

.h

Size

451 bytes

Lines

29

Domain

Architecture Layer

Bucket

arch/openrisc

Inferred role

Architecture Layer: implementation source

Status

source 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.

Dependency Surface

• asm-generic/bitops/ffs.h

Detected Declarations

• function Copyright

Annotated Snippet

#ifndef __ASM_OPENRISC_FFS_H
#define __ASM_OPENRISC_FFS_H

#ifdef CONFIG_OPENRISC_HAVE_INST_FF1

static inline __attribute_const__ int ffs(int x)
{
	int ret;

	__asm__ ("l.ff1 %0,%1"
		 : "=r" (ret)
		 : "r" (x));

	return ret;
}

#else
#include <asm-generic/bitops/ffs.h>
#endif

#endif /* __ASM_OPENRISC_FFS_H */

Annotation

• Immediate include surface: `asm-generic/bitops/ffs.h`.
• Detected declarations: `function Copyright`.
• Atlas domain: Architecture Layer / arch/openrisc.
• 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.