arch/xtensa/lib/bswapdi2.S

File Facts

System

Linux kernel

Corpus path

arch/xtensa/lib/bswapdi2.S

Extension

.S

Size

399 bytes

Lines

23

Domain

Architecture Layer

Bucket

arch/xtensa

Inferred role

Architecture Layer: exported/initcall integration point

Status

integration 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.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.

Dependency Surface

• linux/linkage.h
• asm/asmmacro.h
• asm/core.h

Detected Declarations

• export __bswapdi2

Annotated Snippet

#include <linux/linkage.h>
#include <asm/asmmacro.h>
#include <asm/core.h>

ENTRY(__bswapdi2)

	abi_entry_default
	ssai	8
	srli	a4, a2, 16
	src	a4, a4, a2
	src	a4, a4, a4
	src	a4, a2, a4
	srli	a2, a3, 16
	src	a2, a2, a3
	src	a2, a2, a2
	src	a2, a3, a2
	mov	a3, a4
	abi_ret_default

ENDPROC(__bswapdi2)
EXPORT_SYMBOL(__bswapdi2)

Annotation

• Immediate include surface: `linux/linkage.h`, `asm/asmmacro.h`, `asm/core.h`.
• Detected declarations: `export __bswapdi2`.
• Atlas domain: Architecture Layer / arch/xtensa.
• Implementation status: integration 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.