arch/loongarch/include/asm/bitrev.h

File Facts

System

Linux kernel

Corpus path

arch/loongarch/include/asm/bitrev.h

Extension

.h

Size

692 bytes

Lines

35

Domain

Architecture Layer

Bucket

arch/loongarch

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

• linux/swab.h

Detected Declarations

• function Copyright
• function __arch_bitrev16
• function __arch_bitrev8

Annotated Snippet

#ifndef __LOONGARCH_ASM_BITREV_H__
#define __LOONGARCH_ASM_BITREV_H__

#include <linux/swab.h>

static __always_inline __attribute_const__ u32 __arch_bitrev32(u32 x)
{
	u32 ret;

	asm("bitrev.w	%0, %1" : "=r"(ret) : "r"(x));
	return ret;
}

static __always_inline __attribute_const__ u16 __arch_bitrev16(u16 x)
{
	u16 ret;

	asm("bitrev.4b	%0, %1" : "=r"(ret) : "r"(__swab16(x)));
	return ret;
}

static __always_inline __attribute_const__ u8 __arch_bitrev8(u8 x)
{
	u8 ret;

	asm("bitrev.4b	%0, %1" : "=r"(ret) : "r"(x));
	return ret;
}

#endif /* __LOONGARCH_ASM_BITREV_H__ */

Annotation

• Immediate include surface: `linux/swab.h`.
• Detected declarations: `function Copyright`, `function __arch_bitrev16`, `function __arch_bitrev8`.
• Atlas domain: Architecture Layer / arch/loongarch.
• 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.