arch/x86/include/uapi/asm/swab.h

File Facts

System

Linux kernel

Corpus path

arch/x86/include/uapi/asm/swab.h

Extension

.h

Size

769 bytes

Lines

38

Domain

Architecture Layer

Bucket

arch/x86

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/types.h
• linux/compiler.h

Detected Declarations

• function __arch_swab32
• function __arch_swab64

Annotated Snippet

#ifndef _ASM_X86_SWAB_H
#define _ASM_X86_SWAB_H

#include <linux/types.h>
#include <linux/compiler.h>

static inline __attribute_const__ __u32 __arch_swab32(__u32 val)
{
	asm("bswapl %0" : "=r" (val) : "0" (val));
	return val;
}
#define __arch_swab32 __arch_swab32

static inline __attribute_const__ __u64 __arch_swab64(__u64 val)
{
#ifdef __i386__
	union {
		struct {
			__u32 a;
			__u32 b;
		} s;
		__u64 u;
	} v;
	v.u = val;
	asm("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
	    : "=r" (v.s.a), "=r" (v.s.b)
	    : "0" (v.s.a), "1" (v.s.b));
	return v.u;
#else /* __i386__ */
	asm("bswapq %0" : "=r" (val) : "0" (val));
	return val;
#endif
}
#define __arch_swab64 __arch_swab64

#endif /* _ASM_X86_SWAB_H */

Annotation

• Immediate include surface: `linux/types.h`, `linux/compiler.h`.
• Detected declarations: `function __arch_swab32`, `function __arch_swab64`.
• Atlas domain: Architecture Layer / arch/x86.
• 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.