arch/arm/lib/bswapsdi2.S

File Facts

System

Linux kernel

Corpus path

arch/arm/lib/bswapsdi2.S

Extension

.S

Size

649 bytes

Lines

39

Domain

Architecture Layer

Bucket

arch/arm

Inferred role

Architecture Layer: arch/arm

Status

atlas-only

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/linkage.h
• asm/assembler.h

Detected Declarations

• No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

#include <linux/linkage.h>
#include <asm/assembler.h>

#if __LINUX_ARM_ARCH__ >= 6
ENTRY(__bswapsi2)
	rev r0, r0
	bx lr
ENDPROC(__bswapsi2)

ENTRY(__bswapdi2)
	rev r3, r0
	rev r0, r1
	mov r1, r3
	bx lr
ENDPROC(__bswapdi2)
#else
ENTRY(__bswapsi2)
	eor r3, r0, r0, ror #16
	mov r3, r3, lsr #8
	bic r3, r3, #0xff00
	eor r0, r3, r0, ror #8
	ret lr
ENDPROC(__bswapsi2)

ENTRY(__bswapdi2)
	mov ip, r1
	eor r3, ip, ip, ror #16
	eor r1, r0, r0, ror #16
	mov r1, r1, lsr #8
	mov r3, r3, lsr #8
	bic r3, r3, #0xff00
	bic r1, r1, #0xff00
	eor r1, r1, r0, ror #8
	eor r0, r3, ip, ror #8
	ret lr
ENDPROC(__bswapdi2)
#endif

Annotation

• Immediate include surface: `linux/linkage.h`, `asm/assembler.h`.
• Atlas domain: Architecture Layer / arch/arm.
• Implementation status: atlas-only.

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.